HPSDRwiki - User contributions [en]

DEMETER

2008-08-08T14:31:08Z

PE1RGE: /* Design Ideas */

== Demeter - HPSDR Power Supply & Tiny Demeter ==

Project Leader: Jeroen, PE1RGE

"Demeter" is the project-name for the HPSDR power supply. Although power supplies are widely available, Demeter will be specifically designed for the HPSDR project.

On the 13th of June 2008, Tiny Demeter is added to the Demeter page. Tiny Demeter has a simpler design. Tiny Demeter will be more suitable for experimenters and allow us to gain some experience before constructing Demeter.

Further information will be presented on this page when it becomes available.

73 Jeroen PE1RGE

Result of the discussion on the HPSDR mailing-list (11th June 2007):

'''DEMETER SPECIFICATIONS'''

'''Input'''
13.8 Volt DC (always 13.8 V or is there a supply range, see remark below)
110 Vac (mains)
230 Vac (mains)
Battery (13.8 Volt) input with automatic switchover

'''Input connector'''
Powerpole connector for DC 13.8 Volt
Mains connector: National standard

'''Output voltages'''
Remote switchable voltages
+5 Volt @ …. Amps
+12 Volt @ ….. Amps
-12 Volt @ ….. Amps

'''Standby supply (for GPS-engine and OCXO)'''
Constant on
+5 Volt
+15 Volt
+24 Volt (depends on OCXO used, if possible user definable/adjustable)

'''Output connector'''
ATX-connector
DIN 41612 (Atlas connectors)

'''Protection'''
Input protection (high/low voltage, polarity)
Output protection (current limiting, voltage crowbar)

'''Monitoring'''
· Input voltage
· Output voltage
· Output currents
· Temperature

'''Power supply communication'''
Atlas backplane
USB-bus
1 wire interface (controlled by a board on Atlas)
Dumb-interface using the pins T7 and T8 on the Atlas

'''Connection to the HPSDR'''
Using the ATX power connector, communication via the USB bus
Using the DIN41612 connector using the Atlas backplane for communication

'''Position of the power supply'''
On the Atlas backplane
In a separate box (outside/inside Pandora)

'''HPSDR configuration'''
Ozymandias - interface module
Mercury – receiver (5V @ 500mA, 12V @ 200mA, -12V not used)
Penelope – transmitter (5V @ 300mA, 12V @ 200mA, -12V not used))
Alexiares - RF Bandpass Filters
Gibraltar - frequency standard
Epimetheus - antenna and other switching

Measured: Ozy + Janus: +12v @ 200mA, +5v @ 180 ma, -12v @ 70 ma

'''Questions/remarks'''
Switching or Linear?
Internal/External?
Power dissipation (Convection cooling/ forced air-cooling)?
Do we need computer monitoring of voltages and currents?
Include an USB-HUB (use one of the ports for the power supply communication)?
Configuration (to use or not to use the SDR-1000)? People who use it in combination with the
SDR-1000 need less power from the power-supply and are using a custom built supply or the SDR-1000
power supply.
Will the 13.8Volt really be 13.8Volt or “something” between 11.0 Volt and 15 Volt? In other
words: How many people are going to use the HPSDR mobile?

Linear (A “lot of heat”, not “green”, easy to construct and trouble-shoot)

Switching (Less heat, more “green”, more noise, more difficult to construct)

Transformers:
From my opinion there will always be a normal mains-transformer, both in the switching and the
linear power supply option. Building a switcher for 110Vac/230Vac is too dangerous and
complicated (safety regulations) for (less experienced) home-builders. The switcher will be
situated in the low-voltage part.

[[Image:demeter.jpg]]

Demeter block diagram legenda:
1. Standby transformer – Used for the GPS and OCXO
2. Standby rectifier and buffercapacitor
3. Switch – Switches between mains and battery power
4. Linear regulator
5. Overvoltage protection
6. Solid state (?) mains power switch
7. Power transformer
8. Power rectifiers and buffercapacitors (positive + negative voltage)
9. Switch – Switches between battery, mains and external power
10. Step-up converter
11. Linear regulator +12Volt
12. Overvoltage protection +12Volt
13. Charger (optional)
14. Step-down converter
15. Linear regulator +5Volt
16. Overvoltage protection +5Volt
17. Inverter – generates negative supply from the positive supply
18. Switch – Switches between inverter and mains power
19. Linear regulator –12Volt
20. Overvoltage protection –12Volt
21. Passive filter
22. Overvoltage protection for U++ (Could be used for a PA)
23. USB-Hub – one port used for communication with Demeter
24. PIC controller
25. Temperature sensor(s)
26. Analog to digital converter (for voltage and current)
27. Analog multiplexer
28. Controlled fan (forced air cooling)

== Tiny Demeter ==

Based on the Teamspeak Session from 31st of May 2008 the idea arose to develop a simpler power supply. The working title for this supply became Tiny Demeter.

This supply could be handy for:
- experimenters
- people who want a simple configuration
- temporary solution unitl Demeter becomes available

Tiny Demeter uses the station power supply as main-source. It expects a fairly well regulated 13.6 till 13.8Volts.
From this voltage it will generate:
* +12V @ 1Amp
* +5V @ 1.5Amp
* -12V @ -0.3Amp

Current rating can be increased by adding multiple regulating power transistors.

The regulators for Tiny Demeter (and Demeter) will be build from discrete components. The reason for this are the following:
* It allows "current scaling", by adding more power transistors the current handling can be increased
* A discrete regulator gives better temperature stability
* A discrete regulator gives lower output-noise

From the basic idea of having just a few linear regulators the following extras were added:
* Input voltage monitor; This will warn the user when the input power source voltage is too low. (If the input voltage is below a certain threshold the +12V stability cannot be guaranteed, probably causing problems in the HPSDR system.)
* Temperature regulator/monitor; Due to the nature of linear regulators the power dissipation will be around 15 Watts (without extra regulating transistors).
* Crow-bars for each supply voltage; For added safety
* Shunt-resistors to measure the current for each supply-voltage
* Input protection circuit; probably consists of a fuse and a diode OR a fuse and an electronic switch (switch only closes when the input voltage has the right polarity).

The board itself will have a:
* An ATX 20pin power connector attached to its PCB, so it plugs in directly on Atlas

OR

* An ATX 20pin power connector attached to a short cable and mounting brackets which can be used to mount Tiny Demeter on the mounting holes of Atlas

The proposed schematic block-diagram can be found below:

== Block Diagram ==

Tiny Demeter block-diagram

[[Image:TinyDemeter2.jpg]]

== Design Ideas ==

Here some references are made to components and ideas which I have in mind for the Tiny Demeter design:

'''* Transformers for the switcher:'''

*www.bourns.com/pdfs/pm600_610_620_series.pdf
*www.cooperbussmann.com/3/CoiltronicsFinder.html

'''* Linear regulator'''

*discrete: see schematic below
*Linear Technology LT3080

'''* Crow Bar'''

[[Image:crowbar.jpg]]
This image shows the (basic) schematic diagram of the crowbar circuit. Component values are for a voltage around 20V.
.
.

The principle of the regulator with the discrete components:

[[Media:Regulator.pdf]]

The best topology for the switcher has to be determined. At this moment a Push-Pull configuration looks very promising. This will generate the least harmonics as the duty-cycle of the switcher is close to 50%. To get an idea of a push pull switcher one can look here: http://sound.westhost.com/project89.htm

Please note: THIS IS NOT THE DESIGN FOR DEMETER, ONLY AN EXAMPLE OF THE TOPOLOGY.

'''Preliminary design'''

The following documents contain a part of the design of Tiny Demeter. "Tiny Demeter design.pdf" contains (some) engineering notes. The file "Schematic Prints.pdf" contains the schematic of the switcher, however without the correct values for the components. You can use it to get a general idea of the DC/DC converter design. More details of the design will be added soon!

Design notes:
[[Media:Tiny_Demeter_design.pdf]]

Preliminary (partial) design:
[[Media:Schematic_Prints.pdf]]

--[[User:PE1RGE|PE1RGE]] 08:36, 1st August 2008 (PDT)

DEMETER

2008-08-08T14:22:38Z

PE1RGE: /* Design Ideas */

== Demeter - HPSDR Power Supply & Tiny Demeter ==

Project Leader: Jeroen, PE1RGE

"Demeter" is the project-name for the HPSDR power supply. Although power supplies are widely available, Demeter will be specifically designed for the HPSDR project.

On the 13th of June 2008, Tiny Demeter is added to the Demeter page. Tiny Demeter has a simpler design. Tiny Demeter will be more suitable for experimenters and allow us to gain some experience before constructing Demeter.

Further information will be presented on this page when it becomes available.

73 Jeroen PE1RGE

Result of the discussion on the HPSDR mailing-list (11th June 2007):

'''DEMETER SPECIFICATIONS'''

'''Input'''
13.8 Volt DC (always 13.8 V or is there a supply range, see remark below)
110 Vac (mains)
230 Vac (mains)
Battery (13.8 Volt) input with automatic switchover

'''Input connector'''
Powerpole connector for DC 13.8 Volt
Mains connector: National standard

'''Output voltages'''
Remote switchable voltages
+5 Volt @ …. Amps
+12 Volt @ ….. Amps
-12 Volt @ ….. Amps

'''Standby supply (for GPS-engine and OCXO)'''
Constant on
+5 Volt
+15 Volt
+24 Volt (depends on OCXO used, if possible user definable/adjustable)

'''Output connector'''
ATX-connector
DIN 41612 (Atlas connectors)

'''Protection'''
Input protection (high/low voltage, polarity)
Output protection (current limiting, voltage crowbar)

'''Monitoring'''
· Input voltage
· Output voltage
· Output currents
· Temperature

'''Power supply communication'''
Atlas backplane
USB-bus
1 wire interface (controlled by a board on Atlas)
Dumb-interface using the pins T7 and T8 on the Atlas

'''Connection to the HPSDR'''
Using the ATX power connector, communication via the USB bus
Using the DIN41612 connector using the Atlas backplane for communication

'''Position of the power supply'''
On the Atlas backplane
In a separate box (outside/inside Pandora)

'''HPSDR configuration'''
Ozymandias - interface module
Mercury – receiver (5V @ 500mA, 12V @ 200mA, -12V not used)
Penelope – transmitter (5V @ 300mA, 12V @ 200mA, -12V not used))
Alexiares - RF Bandpass Filters
Gibraltar - frequency standard
Epimetheus - antenna and other switching

Measured: Ozy + Janus: +12v @ 200mA, +5v @ 180 ma, -12v @ 70 ma

'''Questions/remarks'''
Switching or Linear?
Internal/External?
Power dissipation (Convection cooling/ forced air-cooling)?
Do we need computer monitoring of voltages and currents?
Include an USB-HUB (use one of the ports for the power supply communication)?
Configuration (to use or not to use the SDR-1000)? People who use it in combination with the
SDR-1000 need less power from the power-supply and are using a custom built supply or the SDR-1000
power supply.
Will the 13.8Volt really be 13.8Volt or “something” between 11.0 Volt and 15 Volt? In other
words: How many people are going to use the HPSDR mobile?

Linear (A “lot of heat”, not “green”, easy to construct and trouble-shoot)

Switching (Less heat, more “green”, more noise, more difficult to construct)

Transformers:
From my opinion there will always be a normal mains-transformer, both in the switching and the
linear power supply option. Building a switcher for 110Vac/230Vac is too dangerous and
complicated (safety regulations) for (less experienced) home-builders. The switcher will be
situated in the low-voltage part.

[[Image:demeter.jpg]]

Demeter block diagram legenda:
1. Standby transformer – Used for the GPS and OCXO
2. Standby rectifier and buffercapacitor
3. Switch – Switches between mains and battery power
4. Linear regulator
5. Overvoltage protection
6. Solid state (?) mains power switch
7. Power transformer
8. Power rectifiers and buffercapacitors (positive + negative voltage)
9. Switch – Switches between battery, mains and external power
10. Step-up converter
11. Linear regulator +12Volt
12. Overvoltage protection +12Volt
13. Charger (optional)
14. Step-down converter
15. Linear regulator +5Volt
16. Overvoltage protection +5Volt
17. Inverter – generates negative supply from the positive supply
18. Switch – Switches between inverter and mains power
19. Linear regulator –12Volt
20. Overvoltage protection –12Volt
21. Passive filter
22. Overvoltage protection for U++ (Could be used for a PA)
23. USB-Hub – one port used for communication with Demeter
24. PIC controller
25. Temperature sensor(s)
26. Analog to digital converter (for voltage and current)
27. Analog multiplexer
28. Controlled fan (forced air cooling)

== Tiny Demeter ==

Based on the Teamspeak Session from 31st of May 2008 the idea arose to develop a simpler power supply. The working title for this supply became Tiny Demeter.

This supply could be handy for:
- experimenters
- people who want a simple configuration
- temporary solution unitl Demeter becomes available

Tiny Demeter uses the station power supply as main-source. It expects a fairly well regulated 13.6 till 13.8Volts.
From this voltage it will generate:
* +12V @ 1Amp
* +5V @ 1.5Amp
* -12V @ -0.3Amp

Current rating can be increased by adding multiple regulating power transistors.

The regulators for Tiny Demeter (and Demeter) will be build from discrete components. The reason for this are the following:
* It allows "current scaling", by adding more power transistors the current handling can be increased
* A discrete regulator gives better temperature stability
* A discrete regulator gives lower output-noise

From the basic idea of having just a few linear regulators the following extras were added:
* Input voltage monitor; This will warn the user when the input power source voltage is too low. (If the input voltage is below a certain threshold the +12V stability cannot be guaranteed, probably causing problems in the HPSDR system.)
* Temperature regulator/monitor; Due to the nature of linear regulators the power dissipation will be around 15 Watts (without extra regulating transistors).
* Crow-bars for each supply voltage; For added safety
* Shunt-resistors to measure the current for each supply-voltage
* Input protection circuit; probably consists of a fuse and a diode OR a fuse and an electronic switch (switch only closes when the input voltage has the right polarity).

The board itself will have a:
* An ATX 20pin power connector attached to its PCB, so it plugs in directly on Atlas

OR

* An ATX 20pin power connector attached to a short cable and mounting brackets which can be used to mount Tiny Demeter on the mounting holes of Atlas

The proposed schematic block-diagram can be found below:

== Block Diagram ==

Tiny Demeter block-diagram

[[Image:TinyDemeter2.jpg]]

== Design Ideas ==

Here some references are made to components and ideas which I have in mind for the Tiny Demeter design:

'''* Transformers for the switcher:'''

*www.bourns.com/pdfs/pm600_610_620_series.pdf
*www.cooperbussmann.com/3/CoiltronicsFinder.html

'''* Linear regulator'''

*discrete: see schematic below
*Linear Technology LT3080

'''* Crow Bar'''

[[Image:crowbar.jpg]]
This image shows the (basic) schematic diagram of the crowbar circuit. Component values are for a voltage around 20V.
.
.

The principle of the regulator with the discrete components:

[[Regulator.pdf]]

The best topology for the switcher has to be determined. At this moment a Push-Pull configuration looks very promising. This will generate the least harmonics as the duty-cycle of the switcher is close to 50%. To get an idea of a push pull switcher one can look here: http://sound.westhost.com/project89.htm

Please note: THIS IS NOT THE DESIGN FOR DEMETER, ONLY AN EXAMPLE OF THE TOPOLOGY.

'''Preliminary design'''

The following documents contain a part of the design of Tiny Demeter. "Tiny Demeter design.pdf" contains (some) engineering notes. The file "Schematic Prints.pdf" contains the schematic of the switcher, however without the correct values for the components. You can use it to get a general idea of the DC/DC converter design. More details of the design will be added soon!

Design notes:
[[Tiny_Demeter_design.pdf]]

Preliminary (partial) design:
[[Schematic_Prints.pdf]]

--[[User:PE1RGE|PE1RGE]] 08:36, 1st August 2008 (PDT)

File:Tiny Demeter design.pdf

2008-08-08T14:21:43Z

PE1RGE: uploaded a new version of "Image:Tiny Demeter design.pdf"

DEMETER

2008-08-01T14:45:27Z

PE1RGE: /* Design Ideas */

== Demeter - HPSDR Power Supply & Tiny Demeter ==

Project Leader: Jeroen, PE1RGE

"Demeter" is the project-name for the HPSDR power supply. Although power supplies are widely available, Demeter will be specifically designed for the HPSDR project.

On the 13th of June 2008, Tiny Demeter is added to the Demeter page. Tiny Demeter has a simpler design. Tiny Demeter will be more suitable for experimenters and allow us to gain some experience before constructing Demeter.

Further information will be presented on this page when it becomes available.

73 Jeroen PE1RGE

Result of the discussion on the HPSDR mailing-list (11th June 2007):

'''DEMETER SPECIFICATIONS'''

'''Input'''
13.8 Volt DC (always 13.8 V or is there a supply range, see remark below)
110 Vac (mains)
230 Vac (mains)
Battery (13.8 Volt) input with automatic switchover

'''Input connector'''
Powerpole connector for DC 13.8 Volt
Mains connector: National standard

'''Output voltages'''
Remote switchable voltages
+5 Volt @ …. Amps
+12 Volt @ ….. Amps
-12 Volt @ ….. Amps

'''Standby supply (for GPS-engine and OCXO)'''
Constant on
+5 Volt
+15 Volt
+24 Volt (depends on OCXO used, if possible user definable/adjustable)

'''Output connector'''
ATX-connector
DIN 41612 (Atlas connectors)

'''Protection'''
Input protection (high/low voltage, polarity)
Output protection (current limiting, voltage crowbar)

'''Monitoring'''
· Input voltage
· Output voltage
· Output currents
· Temperature

'''Power supply communication'''
Atlas backplane
USB-bus
1 wire interface (controlled by a board on Atlas)
Dumb-interface using the pins T7 and T8 on the Atlas

'''Connection to the HPSDR'''
Using the ATX power connector, communication via the USB bus
Using the DIN41612 connector using the Atlas backplane for communication

'''Position of the power supply'''
On the Atlas backplane
In a separate box (outside/inside Pandora)

'''HPSDR configuration'''
Ozymandias - interface module
Mercury – receiver (5V @ 500mA, 12V @ 200mA, -12V not used)
Penelope – transmitter (5V @ 300mA, 12V @ 200mA, -12V not used))
Alexiares - RF Bandpass Filters
Gibraltar - frequency standard
Epimetheus - antenna and other switching

Measured: Ozy + Janus: +12v @ 200mA, +5v @ 180 ma, -12v @ 70 ma

'''Questions/remarks'''
Switching or Linear?
Internal/External?
Power dissipation (Convection cooling/ forced air-cooling)?
Do we need computer monitoring of voltages and currents?
Include an USB-HUB (use one of the ports for the power supply communication)?
Configuration (to use or not to use the SDR-1000)? People who use it in combination with the
SDR-1000 need less power from the power-supply and are using a custom built supply or the SDR-1000
power supply.
Will the 13.8Volt really be 13.8Volt or “something” between 11.0 Volt and 15 Volt? In other
words: How many people are going to use the HPSDR mobile?

Linear (A “lot of heat”, not “green”, easy to construct and trouble-shoot)

Switching (Less heat, more “green”, more noise, more difficult to construct)

Transformers:
From my opinion there will always be a normal mains-transformer, both in the switching and the
linear power supply option. Building a switcher for 110Vac/230Vac is too dangerous and
complicated (safety regulations) for (less experienced) home-builders. The switcher will be
situated in the low-voltage part.

[[Image:demeter.jpg]]

Demeter block diagram legenda:
1. Standby transformer – Used for the GPS and OCXO
2. Standby rectifier and buffercapacitor
3. Switch – Switches between mains and battery power
4. Linear regulator
5. Overvoltage protection
6. Solid state (?) mains power switch
7. Power transformer
8. Power rectifiers and buffercapacitors (positive + negative voltage)
9. Switch – Switches between battery, mains and external power
10. Step-up converter
11. Linear regulator +12Volt
12. Overvoltage protection +12Volt
13. Charger (optional)
14. Step-down converter
15. Linear regulator +5Volt
16. Overvoltage protection +5Volt
17. Inverter – generates negative supply from the positive supply
18. Switch – Switches between inverter and mains power
19. Linear regulator –12Volt
20. Overvoltage protection –12Volt
21. Passive filter
22. Overvoltage protection for U++ (Could be used for a PA)
23. USB-Hub – one port used for communication with Demeter
24. PIC controller
25. Temperature sensor(s)
26. Analog to digital converter (for voltage and current)
27. Analog multiplexer
28. Controlled fan (forced air cooling)

== Tiny Demeter ==

Based on the Teamspeak Session from 31st of May 2008 the idea arose to develop a simpler power supply. The working title for this supply became Tiny Demeter.

This supply could be handy for:
- experimenters
- people who want a simple configuration
- temporary solution unitl Demeter becomes available

Tiny Demeter uses the station power supply as main-source. It expects a fairly well regulated 13.6 till 13.8Volts.
From this voltage it will generate:
* +12V @ 1Amp
* +5V @ 1.5Amp
* -12V @ -0.3Amp

Current rating can be increased by adding multiple regulating power transistors.

The regulators for Tiny Demeter (and Demeter) will be build from discrete components. The reason for this are the following:
* It allows "current scaling", by adding more power transistors the current handling can be increased
* A discrete regulator gives better temperature stability
* A discrete regulator gives lower output-noise

From the basic idea of having just a few linear regulators the following extras were added:
* Input voltage monitor; This will warn the user when the input power source voltage is too low. (If the input voltage is below a certain threshold the +12V stability cannot be guaranteed, probably causing problems in the HPSDR system.)
* Temperature regulator/monitor; Due to the nature of linear regulators the power dissipation will be around 15 Watts (without extra regulating transistors).
* Crow-bars for each supply voltage; For added safety
* Shunt-resistors to measure the current for each supply-voltage
* Input protection circuit; probably consists of a fuse and a diode OR a fuse and an electronic switch (switch only closes when the input voltage has the right polarity).

The board itself will have a:
* An ATX 20pin power connector attached to its PCB, so it plugs in directly on Atlas

OR

* An ATX 20pin power connector attached to a short cable and mounting brackets which can be used to mount Tiny Demeter on the mounting holes of Atlas

The proposed schematic block-diagram can be found below:

== Block Diagram ==

Tiny Demeter block-diagram

[[Image:TinyDemeter2.jpg]]

== Design Ideas ==

Here some references are made to components and ideas which I have in mind for the Tiny Demeter design:

'''* Transformers for the switcher:'''

*www.bourns.com/pdfs/pm600_610_620_series.pdf
*www.cooperbussmann.com/3/CoiltronicsFinder.html

'''* Linear regulator'''

*discrete: see schematic below
*Linear Technology LT3080

'''* Crow Bar'''

[[Image:crowbar.jpg]]
This image shows the (basic) schematic diagram of the crowbar circuit. Component values are for a voltage around 20V.
.
.

The principle of the regulator with the discrete components:

[[Regulator.pdf]]

The best topology for the switcher has to be determined. At this moment a Push-Pull configuration looks very promising. This will generate the least harmonics as the duty-cycle of the switcher is close to 50%. To get an idea of a push pull switcher one can look here: http://sound.westhost.com/project89.htm

Please note: THIS IS NOT THE DESIGN FOR DEMETER, ONLY AN EXAMPLE OF THE TOPOLOGY.

'''Preliminary design'''

The following documents contain a part of the design of Tiny Demeter. "Tiny Demeter design.pdf" contains (some) engineering notes. The file "Schematic Prints.pdf" contains the schematic of the switcher, however without the correct values for the components. You can use it to get a general idea of the DC/DC converter design. More details of the design will be added soon!

Design notes:
[[Tiny Demeter design.pdf]]

Preliminary (partial) design:
[[Schematic Prints.pdf]]

--[[User:PE1RGE|PE1RGE]] 08:36, 1st August 2008 (PDT)

DEMETER

2008-08-01T14:42:59Z

PE1RGE: /* Design Ideas */

== Demeter - HPSDR Power Supply & Tiny Demeter ==

Project Leader: Jeroen, PE1RGE

"Demeter" is the project-name for the HPSDR power supply. Although power supplies are widely available, Demeter will be specifically designed for the HPSDR project.

On the 13th of June 2008, Tiny Demeter is added to the Demeter page. Tiny Demeter has a simpler design. Tiny Demeter will be more suitable for experimenters and allow us to gain some experience before constructing Demeter.

Further information will be presented on this page when it becomes available.

73 Jeroen PE1RGE

Result of the discussion on the HPSDR mailing-list (11th June 2007):

'''DEMETER SPECIFICATIONS'''

'''Input'''
13.8 Volt DC (always 13.8 V or is there a supply range, see remark below)
110 Vac (mains)
230 Vac (mains)
Battery (13.8 Volt) input with automatic switchover

'''Input connector'''
Powerpole connector for DC 13.8 Volt
Mains connector: National standard

'''Output voltages'''
Remote switchable voltages
+5 Volt @ …. Amps
+12 Volt @ ….. Amps
-12 Volt @ ….. Amps

'''Standby supply (for GPS-engine and OCXO)'''
Constant on
+5 Volt
+15 Volt
+24 Volt (depends on OCXO used, if possible user definable/adjustable)

'''Output connector'''
ATX-connector
DIN 41612 (Atlas connectors)

'''Protection'''
Input protection (high/low voltage, polarity)
Output protection (current limiting, voltage crowbar)

'''Monitoring'''
· Input voltage
· Output voltage
· Output currents
· Temperature

'''Power supply communication'''
Atlas backplane
USB-bus
1 wire interface (controlled by a board on Atlas)
Dumb-interface using the pins T7 and T8 on the Atlas

'''Connection to the HPSDR'''
Using the ATX power connector, communication via the USB bus
Using the DIN41612 connector using the Atlas backplane for communication

'''Position of the power supply'''
On the Atlas backplane
In a separate box (outside/inside Pandora)

'''HPSDR configuration'''
Ozymandias - interface module
Mercury – receiver (5V @ 500mA, 12V @ 200mA, -12V not used)
Penelope – transmitter (5V @ 300mA, 12V @ 200mA, -12V not used))
Alexiares - RF Bandpass Filters
Gibraltar - frequency standard
Epimetheus - antenna and other switching

Measured: Ozy + Janus: +12v @ 200mA, +5v @ 180 ma, -12v @ 70 ma

'''Questions/remarks'''
Switching or Linear?
Internal/External?
Power dissipation (Convection cooling/ forced air-cooling)?
Do we need computer monitoring of voltages and currents?
Include an USB-HUB (use one of the ports for the power supply communication)?
Configuration (to use or not to use the SDR-1000)? People who use it in combination with the
SDR-1000 need less power from the power-supply and are using a custom built supply or the SDR-1000
power supply.
Will the 13.8Volt really be 13.8Volt or “something” between 11.0 Volt and 15 Volt? In other
words: How many people are going to use the HPSDR mobile?

Linear (A “lot of heat”, not “green”, easy to construct and trouble-shoot)

Switching (Less heat, more “green”, more noise, more difficult to construct)

Transformers:
From my opinion there will always be a normal mains-transformer, both in the switching and the
linear power supply option. Building a switcher for 110Vac/230Vac is too dangerous and
complicated (safety regulations) for (less experienced) home-builders. The switcher will be
situated in the low-voltage part.

[[Image:demeter.jpg]]

Demeter block diagram legenda:
1. Standby transformer – Used for the GPS and OCXO
2. Standby rectifier and buffercapacitor
3. Switch – Switches between mains and battery power
4. Linear regulator
5. Overvoltage protection
6. Solid state (?) mains power switch
7. Power transformer
8. Power rectifiers and buffercapacitors (positive + negative voltage)
9. Switch – Switches between battery, mains and external power
10. Step-up converter
11. Linear regulator +12Volt
12. Overvoltage protection +12Volt
13. Charger (optional)
14. Step-down converter
15. Linear regulator +5Volt
16. Overvoltage protection +5Volt
17. Inverter – generates negative supply from the positive supply
18. Switch – Switches between inverter and mains power
19. Linear regulator –12Volt
20. Overvoltage protection –12Volt
21. Passive filter
22. Overvoltage protection for U++ (Could be used for a PA)
23. USB-Hub – one port used for communication with Demeter
24. PIC controller
25. Temperature sensor(s)
26. Analog to digital converter (for voltage and current)
27. Analog multiplexer
28. Controlled fan (forced air cooling)

== Tiny Demeter ==

Based on the Teamspeak Session from 31st of May 2008 the idea arose to develop a simpler power supply. The working title for this supply became Tiny Demeter.

This supply could be handy for:
- experimenters
- people who want a simple configuration
- temporary solution unitl Demeter becomes available

Tiny Demeter uses the station power supply as main-source. It expects a fairly well regulated 13.6 till 13.8Volts.
From this voltage it will generate:
* +12V @ 1Amp
* +5V @ 1.5Amp
* -12V @ -0.3Amp

Current rating can be increased by adding multiple regulating power transistors.

The regulators for Tiny Demeter (and Demeter) will be build from discrete components. The reason for this are the following:
* It allows "current scaling", by adding more power transistors the current handling can be increased
* A discrete regulator gives better temperature stability
* A discrete regulator gives lower output-noise

From the basic idea of having just a few linear regulators the following extras were added:
* Input voltage monitor; This will warn the user when the input power source voltage is too low. (If the input voltage is below a certain threshold the +12V stability cannot be guaranteed, probably causing problems in the HPSDR system.)
* Temperature regulator/monitor; Due to the nature of linear regulators the power dissipation will be around 15 Watts (without extra regulating transistors).
* Crow-bars for each supply voltage; For added safety
* Shunt-resistors to measure the current for each supply-voltage
* Input protection circuit; probably consists of a fuse and a diode OR a fuse and an electronic switch (switch only closes when the input voltage has the right polarity).

The board itself will have a:
* An ATX 20pin power connector attached to its PCB, so it plugs in directly on Atlas

OR

* An ATX 20pin power connector attached to a short cable and mounting brackets which can be used to mount Tiny Demeter on the mounting holes of Atlas

The proposed schematic block-diagram can be found below:

== Block Diagram ==

Tiny Demeter block-diagram

[[Image:TinyDemeter2.jpg]]

== Design Ideas ==

Here some references are made to components and ideas which I have in mind for the Tiny Demeter design:

'''* Transformers for the switcher:'''

*www.bourns.com/pdfs/pm600_610_620_series.pdf
*www.cooperbussmann.com/3/CoiltronicsFinder.html

'''* Linear regulator'''

*discrete: see schematic below
*Linear Technology LT3080

'''* Crow Bar'''

[[Image:crowbar.jpg]]
This image shows the (basic) schematic diagram of the crowbar circuit. Component values are for a voltage around 20V.
.
.

The principle of the regulator with the discrete components:

[[Regulator.pdf]]

The best topology for the switcher has to be determined. At this moment a Push-Pull configuration looks very promising. This will generate the least harmonics as the duty-cycle of the switcher is close to 50%. To get an idea of a push pull switcher one can look here: http://sound.westhost.com/project89.htm

Please note: THIS IS NOT THE DESIGN FOR DEMETER, ONLY AN EXAMPLE OF THE TOPOLOGY.

'''Preliminary design'''

The following documents contain a part of the design of Tiny Demeter. "Tiny Demeter design.pdf" contains (some) engineering notes. The file "Schematic Prints.pdf" contains the schematic of the switcher, however without the correct values for the components. You can use it to get a general idea of the DC/DC converter design. More details of the design will be added soon!

[[Tiny Demeter design.pdf]]
[[Schematic Prints.pdf]]

--[[User:PE1RGE|PE1RGE]] 08:36, 1st August 2008 (PDT)

File:Tiny Demeter design.pdf

2008-08-01T14:36:04Z

PE1RGE:

File:Schematic Prints.pdf

2008-08-01T14:34:09Z

PE1RGE:

DEMETER

2008-07-04T15:36:04Z

PE1RGE:

== Demeter - HPSDR Power Supply & Tiny Demeter ==

Project Leader: Jeroen, PE1RGE

"Demeter" is the project-name for the HPSDR power supply. Although power supplies are widely available, Demeter will be specifically designed for the HPSDR project.

On the 13th of June 2008, Tiny Demeter is added to the Demeter page. Tiny Demeter has a simpler design. Tiny Demeter will be more suitable for experimenters and allow us to gain some experience before constructing Demeter.

Further information will be presented on this page when it becomes available.

73 Jeroen PE1RGE

Result of the discussion on the HPSDR mailing-list (11th June 2007):

'''DEMETER SPECIFICATIONS'''

'''Input'''
13.8 Volt DC (always 13.8 V or is there a supply range, see remark below)
110 Vac (mains)
230 Vac (mains)
Battery (13.8 Volt) input with automatic switchover

'''Input connector'''
Powerpole connector for DC 13.8 Volt
Mains connector: National standard

'''Output voltages'''
Remote switchable voltages
+5 Volt @ …. Amps
+12 Volt @ ….. Amps
-12 Volt @ ….. Amps

'''Standby supply (for GPS-engine and OCXO)'''
Constant on
+5 Volt
+15 Volt
+24 Volt (depends on OCXO used, if possible user definable/adjustable)

'''Output connector'''
ATX-connector
DIN 41612 (Atlas connectors)

'''Protection'''
Input protection (high/low voltage, polarity)
Output protection (current limiting, voltage crowbar)

'''Monitoring'''
· Input voltage
· Output voltage
· Output currents
· Temperature

'''Power supply communication'''
Atlas backplane
USB-bus
1 wire interface (controlled by a board on Atlas)
Dumb-interface using the pins T7 and T8 on the Atlas

'''Connection to the HPSDR'''
Using the ATX power connector, communication via the USB bus
Using the DIN41612 connector using the Atlas backplane for communication

'''Position of the power supply'''
On the Atlas backplane
In a separate box (outside/inside Pandora)

'''HPSDR configuration'''
Ozymandias - interface module
Mercury – receiver (5V @ 500mA, 12V @ 200mA, -12V not used)
Penelope – transmitter (5V @ 300mA, 12V @ 200mA, -12V not used))
Alexiares - RF Bandpass Filters
Gibraltar - frequency standard
Epimetheus - antenna and other switching

Measured: Ozy + Janus: +12v @ 200mA, +5v @ 180 ma, -12v @ 70 ma

'''Questions/remarks'''
Switching or Linear?
Internal/External?
Power dissipation (Convection cooling/ forced air-cooling)?
Do we need computer monitoring of voltages and currents?
Include an USB-HUB (use one of the ports for the power supply communication)?
Configuration (to use or not to use the SDR-1000)? People who use it in combination with the
SDR-1000 need less power from the power-supply and are using a custom built supply or the SDR-1000
power supply.
Will the 13.8Volt really be 13.8Volt or “something” between 11.0 Volt and 15 Volt? In other
words: How many people are going to use the HPSDR mobile?

Linear (A “lot of heat”, not “green”, easy to construct and trouble-shoot)

Switching (Less heat, more “green”, more noise, more difficult to construct)

Transformers:
From my opinion there will always be a normal mains-transformer, both in the switching and the
linear power supply option. Building a switcher for 110Vac/230Vac is too dangerous and
complicated (safety regulations) for (less experienced) home-builders. The switcher will be
situated in the low-voltage part.

[[Image:demeter.jpg]]

Demeter block diagram legenda:
1. Standby transformer – Used for the GPS and OCXO
2. Standby rectifier and buffercapacitor
3. Switch – Switches between mains and battery power
4. Linear regulator
5. Overvoltage protection
6. Solid state (?) mains power switch
7. Power transformer
8. Power rectifiers and buffercapacitors (positive + negative voltage)
9. Switch – Switches between battery, mains and external power
10. Step-up converter
11. Linear regulator +12Volt
12. Overvoltage protection +12Volt
13. Charger (optional)
14. Step-down converter
15. Linear regulator +5Volt
16. Overvoltage protection +5Volt
17. Inverter – generates negative supply from the positive supply
18. Switch – Switches between inverter and mains power
19. Linear regulator –12Volt
20. Overvoltage protection –12Volt
21. Passive filter
22. Overvoltage protection for U++ (Could be used for a PA)
23. USB-Hub – one port used for communication with Demeter
24. PIC controller
25. Temperature sensor(s)
26. Analog to digital converter (for voltage and current)
27. Analog multiplexer
28. Controlled fan (forced air cooling)

== Tiny Demeter ==

Based on the Teamspeak Session from 31st of May 2008 the idea arose to develop a simpler power supply. The working title for this supply became Tiny Demeter.

This supply could be handy for:
- experimenters
- people who want a simple configuration
- temporary solution unitl Demeter becomes available

Tiny Demeter uses the station power supply as main-source. It expects a fairly well regulated 13.6 till 13.8Volts.
From this voltage it will generate:
* +12V @ 1Amp
* +5V @ 1.5Amp
* -12V @ -0.3Amp

Current rating can be increased by adding multiple regulating power transistors.

The regulators for Tiny Demeter (and Demeter) will be build from discrete components. The reason for this are the following:
* It allows "current scaling", by adding more power transistors the current handling can be increased
* A discrete regulator gives better temperature stability
* A discrete regulator gives lower output-noise

From the basic idea of having just a few linear regulators the following extras were added:
* Input voltage monitor; This will warn the user when the input power source voltage is too low. (If the input voltage is below a certain threshold the +12V stability cannot be guaranteed, probably causing problems in the HPSDR system.)
* Temperature regulator/monitor; Due to the nature of linear regulators the power dissipation will be around 15 Watts (without extra regulating transistors).
* Crow-bars for each supply voltage; For added safety
* Shunt-resistors to measure the current for each supply-voltage
* Input protection circuit; probably consists of a fuse and a diode OR a fuse and an electronic switch (switch only closes when the input voltage has the right polarity).

The board itself will have a:
* An ATX 20pin power connector attached to its PCB, so it plugs in directly on Atlas

OR

* An ATX 20pin power connector attached to a short cable and mounting brackets which can be used to mount Tiny Demeter on the mounting holes of Atlas

The proposed schematic block-diagram can be found below:

== Block Diagram ==

Tiny Demeter block-diagram

[[Image:TinyDemeter2.jpg]]

== Design Ideas ==

Here some references are made to components and ideas which I have in mind for the Tiny Demeter design:

'''* Transformers for the switcher:'''

*www.bourns.com/pdfs/pm600_610_620_series.pdf
*www.cooperbussmann.com/3/CoiltronicsFinder.html

'''* Linear regulator'''

*discrete: see schematic below
*Linear Technology LT3080

'''* Crow Bar'''

[[Image:crowbar.jpg]]
This image shows the (basic) schematic diagram of the crowbar circuit. Component values are for a voltage around 20V.
.
.

The principle of the regulator with the discrete components:

[[Regulator.pdf]]

The best topology for the switcher has to be determined. At this moment a Push-Pull configuration looks very promising. This will generate the least harmonics as the duty-cycle of the switcher is close to 50%. To get an idea of a push pull switcher one can look here: http://sound.westhost.com/project89.htm

Please note: THIS IS NOT THE DESIGN FOR DEMETER, ONLY AN EXAMPLE OF THE TOPOLOGY.

--[[User:PE1RGE|PE1RGE]] 08:36, 4 July 2008 (PDT)

File:Regulator.pdf

2008-07-04T15:27:50Z

PE1RGE:

File:Crowbar.jpg

2008-07-04T15:27:29Z

PE1RGE:

DEMETER

2008-07-04T15:27:09Z

PE1RGE:

== Demeter - HPSDR Power Supply & Tiny Demeter ==

Project Leader: Jeroen, PE1RGE

"Demeter" is the project-name for the HPSDR power supply. Although power supplies are widely available, Demeter will be specifically designed for the HPSDR project.

On the 13th of June 2008, Tiny Demeter is added to the Demeter page. Tiny Demeter has a simpler design. Tiny Demeter will be more suitable for experimenters and allow us to gain some experience before constructing Demeter.

Further information will be presented on this page when it becomes available.

73 Jeroen PE1RGE

Result of the discussion on the HPSDR mailing-list (11th June 2007):

'''DEMETER SPECIFICATIONS'''

'''Input'''
13.8 Volt DC (always 13.8 V or is there a supply range, see remark below)
110 Vac (mains)
230 Vac (mains)
Battery (13.8 Volt) input with automatic switchover

'''Input connector'''
Powerpole connector for DC 13.8 Volt
Mains connector: National standard

'''Output voltages'''
Remote switchable voltages
+5 Volt @ …. Amps
+12 Volt @ ….. Amps
-12 Volt @ ….. Amps

'''Standby supply (for GPS-engine and OCXO)'''
Constant on
+5 Volt
+15 Volt
+24 Volt (depends on OCXO used, if possible user definable/adjustable)

'''Output connector'''
ATX-connector
DIN 41612 (Atlas connectors)

'''Protection'''
Input protection (high/low voltage, polarity)
Output protection (current limiting, voltage crowbar)

'''Monitoring'''
· Input voltage
· Output voltage
· Output currents
· Temperature

'''Power supply communication'''
Atlas backplane
USB-bus
1 wire interface (controlled by a board on Atlas)
Dumb-interface using the pins T7 and T8 on the Atlas

'''Connection to the HPSDR'''
Using the ATX power connector, communication via the USB bus
Using the DIN41612 connector using the Atlas backplane for communication

'''Position of the power supply'''
On the Atlas backplane
In a separate box (outside/inside Pandora)

'''HPSDR configuration'''
Ozymandias - interface module
Mercury – receiver (5V @ 500mA, 12V @ 200mA, -12V not used)
Penelope – transmitter (5V @ 300mA, 12V @ 200mA, -12V not used))
Alexiares - RF Bandpass Filters
Gibraltar - frequency standard
Epimetheus - antenna and other switching

Measured: Ozy + Janus: +12v @ 200mA, +5v @ 180 ma, -12v @ 70 ma

'''Questions/remarks'''
Switching or Linear?
Internal/External?
Power dissipation (Convection cooling/ forced air-cooling)?
Do we need computer monitoring of voltages and currents?
Include an USB-HUB (use one of the ports for the power supply communication)?
Configuration (to use or not to use the SDR-1000)? People who use it in combination with the
SDR-1000 need less power from the power-supply and are using a custom built supply or the SDR-1000
power supply.
Will the 13.8Volt really be 13.8Volt or “something” between 11.0 Volt and 15 Volt? In other
words: How many people are going to use the HPSDR mobile?

Linear (A “lot of heat”, not “green”, easy to construct and trouble-shoot)

Switching (Less heat, more “green”, more noise, more difficult to construct)

Transformers:
From my opinion there will always be a normal mains-transformer, both in the switching and the
linear power supply option. Building a switcher for 110Vac/230Vac is too dangerous and
complicated (safety regulations) for (less experienced) home-builders. The switcher will be
situated in the low-voltage part.

[[Image:demeter.jpg]]

Demeter block diagram legenda:
1. Standby transformer – Used for the GPS and OCXO
2. Standby rectifier and buffercapacitor
3. Switch – Switches between mains and battery power
4. Linear regulator
5. Overvoltage protection
6. Solid state (?) mains power switch
7. Power transformer
8. Power rectifiers and buffercapacitors (positive + negative voltage)
9. Switch – Switches between battery, mains and external power
10. Step-up converter
11. Linear regulator +12Volt
12. Overvoltage protection +12Volt
13. Charger (optional)
14. Step-down converter
15. Linear regulator +5Volt
16. Overvoltage protection +5Volt
17. Inverter – generates negative supply from the positive supply
18. Switch – Switches between inverter and mains power
19. Linear regulator –12Volt
20. Overvoltage protection –12Volt
21. Passive filter
22. Overvoltage protection for U++ (Could be used for a PA)
23. USB-Hub – one port used for communication with Demeter
24. PIC controller
25. Temperature sensor(s)
26. Analog to digital converter (for voltage and current)
27. Analog multiplexer
28. Controlled fan (forced air cooling)

== Tiny Demeter ==

Based on the Teamspeak Session from 31st of May 2008 the idea arose to develop a simpler power supply. The working title for this supply became Tiny Demeter.

This supply could be handy for:
- experimenters
- people who want a simple configuration
- temporary solution unitl Demeter becomes available

Tiny Demeter uses the station power supply as main-source. It expects a fairly well regulated 13.6 till 13.8Volts.
From this voltage it will generate:
* +12V @ 1Amp
* +5V @ 1.5Amp
* -12V @ -0.3Amp

Current rating can be increased by adding multiple regulating power transistors.

The regulators for Tiny Demeter (and Demeter) will be build from discrete components. The reason for this are the following:
* It allows "current scaling", by adding more power transistors the current handling can be increased
* A discrete regulator gives better temperature stability
* A discrete regulator gives lower output-noise

From the basic idea of having just a few linear regulators the following extras were added:
* Input voltage monitor; This will warn the user when the input power source voltage is too low. (If the input voltage is below a certain threshold the +12V stability cannot be guaranteed, probably causing problems in the HPSDR system.)
* Temperature regulator/monitor; Due to the nature of linear regulators the power dissipation will be around 15 Watts (without extra regulating transistors).
* Crow-bars for each supply voltage; For added safety
* Shunt-resistors to measure the current for each supply-voltage
* Input protection circuit; probably consists of a fuse and a diode OR a fuse and an electronic switch (switch only closes when the input voltage has the right polarity).

The board itself will have a:
* An ATX 20pin power connector attached to its PCB, so it plugs in directly on Atlas

OR

* An ATX 20pin power connector attached to a short cable and mounting brackets which can be used to mount Tiny Demeter on the mounting holes of Atlas

The proposed schematic block-diagram can be found below:

== Block Diagram ==

Tiny Demeter block-diagram

[[Image:TinyDemeter2.jpg]]

== Design Ideas ==

Here some references are made to components and ideas which I have in mind for the Tiny Demeter design:

* Transformers for the switcher:
www.bourns.com/pdfs/pm600_610_620_series.pdf
www.cooperbussmann.com/3/CoiltronicsFinder.html

* Linear regulator
discrete: see schematic below
Linear Technology LT3080

* Crow Bar
[[Image:crowbar.jpg]]

The principle of the regulator with the discrete components:

[[Regulator.pdf]]

== Headline text ==

File:TinyDemeter2.jpg

2008-06-13T10:01:19Z

PE1RGE:

DEMETER

2008-06-13T10:01:03Z

PE1RGE:

== Demeter - HPSDR Power Supply & Tiny Demeter ==

Project Leader: Jeroen, PE1RGE

"Demeter" is the project-name for the HPSDR power supply. Although power supplies are widely available, Demeter will be specifically designed for the HPSDR project.

On the 13th of June 2008, Tiny Demeter is added to the Demeter page. Tiny Demeter has a simpler design. Tiny Demeter will be more suitable for experimenters and allowd us to gain some experience before constructing Demeter.

Further information will be presented on this page when it becomes available.

73 Jeroen PE1RGE

Result of the discussion on the HPSDR mailing-list (11th June 2007):

'''DEMETER SPECIFICATIONS'''

'''Input'''
13.8 Volt DC (always 13.8 V or is there a supply range, see remark below)
110 Vac (mains)
230 Vac (mains)
Battery (13.8 Volt) input with automatic switchover

'''Input connector'''
Powerpole connector for DC 13.8 Volt
Mains connector: National standard

'''Output voltages'''
Remote switchable voltages
+5 Volt @ …. Amps
+12 Volt @ ….. Amps
-12 Volt @ ….. Amps

'''Standby supply (for GPS-engine and OCXO)'''
Constant on
+5 Volt
+15 Volt
+24 Volt (depends on OCXO used, if possible user definable/adjustable)

'''Output connector'''
ATX-connector
DIN 41612 (Atlas connectors)

'''Protection'''
Input protection (high/low voltage, polarity)
Output protection (current limiting, voltage crowbar)

'''Monitoring'''
· Input voltage
· Output voltage
· Output currents
· Temperature

'''Power supply communication'''
Atlas backplane
USB-bus
1 wire interface (controlled by a board on Atlas)
Dumb-interface using the pins T7 and T8 on the Atlas

'''Connection to the HPSDR'''
Using the ATX power connector, communication via the USB bus
Using the DIN41612 connector using the Atlas backplane for communication

'''Position of the power supply'''
On the Atlas backplane
In a separate box (outside/inside Pandora)

'''HPSDR configuration'''
Ozymandias - interface module
Mercury – receiver (5V @ 500mA, 12V @ 200mA, -12V not used)
Penelope – transmitter (5V @ 300mA, 12V @ 200mA, -12V not used))
Alexiares - RF Bandpass Filters
Gibraltar - frequency standard
Epimetheus - antenna and other switching

Measured: Ozy + Janus: +12v @ 200mA, +5v @ 180 ma, -12v @ 70 ma

'''Questions/remarks'''
Switching or Linear?
Internal/External?
Power dissipation (Convection cooling/ forced air-cooling)?
Do we need computer monitoring of voltages and currents?
Include an USB-HUB (use one of the ports for the power supply communication)?
Configuration (to use or not to use the SDR-1000)? People who use it in combination with the
SDR-1000 need less power from the power-supply and are using a custom built supply or the SDR-1000
power supply.
Will the 13.8Volt really be 13.8Volt or “something” between 11.0 Volt and 15 Volt? In other
words: How many people are going to use the HPSDR mobile?

Linear (A “lot of heat”, not “green”, easy to construct and trouble-shoot)

Switching (Less heat, more “green”, more noise, more difficult to construct)

Transformers:
From my opinion there will always be a normal mains-transformer, both in the switching and the
linear power supply option. Building a switcher for 110Vac/230Vac is too dangerous and
complicated (safety regulations) for (less experienced) home-builders. The switcher will be
situated in the low-voltage part.

[[Image:demeter.jpg]]

Demeter block diagram legenda:
1. Standby transformer – Used for the GPS and OCXO
2. Standby rectifier and buffercapacitor
3. Switch – Switches between mains and battery power
4. Linear regulator
5. Overvoltage protection
6. Solid state (?) mains power switch
7. Power transformer
8. Power rectifiers and buffercapacitors (positive + negative voltage)
9. Switch – Switches between battery, mains and external power
10. Step-up converter
11. Linear regulator +12Volt
12. Overvoltage protection +12Volt
13. Charger (optional)
14. Step-down converter
15. Linear regulator +5Volt
16. Overvoltage protection +5Volt
17. Inverter – generates negative supply from the positive supply
18. Switch – Switches between inverter and mains power
19. Linear regulator –12Volt
20. Overvoltage protection –12Volt
21. Passive filter
22. Overvoltage protection for U++ (Could be used for a PA)
23. USB-Hub – one port used for communication with Demeter
24. PIC controller
25. Temperature sensor(s)
26. Analog to digital converter (for voltage and current)
27. Analog multiplexer
28. Controlled fan (forced air cooling)

'''== Tiny Demeter =='''

Based on the Teamspeak Session from 31st of June 2008 the idea arose to develop a simpler power supply. The working title for this supply became Tiny Demeter.

This supply could be handy for:
- experimenters
- people who want a simple configuration
- temporary solution unitl Demeter becomes available

Tiny Demeter uses the station power supply as main-source. It expects a fairly well regulated 13.6 till 13.8Volts.
From this voltage it will generate:
* +12V @ 1Amp
* +5V @ 1.5Amp
* -12V @ -0.3Amp

Current rating can be increased by adding multiple regulating power transistors.

The regulators for Tiny Demeter (and Demeter) will be build from discrete components. The reason for this are the following:
* It allows "current scaling", by adding more power transistors the current handling can be increased
* A discrete regulator gives better temperature stability
* A discrete regulator gives lower output-noise

From the basic idea of having just a few linear regulators the following extras were added:
* Input voltage monitor; This will warn the user when the input power source voltage is too low. (If the input voltage is below a certain threshold the +12V stability cannot be guaranteed, probably causing problems in the HPSDR system.)
* Temperature regulator/monitor; Due to the nature of linear regulators the power dissipation will be around 15 Watts (without extra regulating transistors).
* Crow-bars for each supply voltage; For added safety
* Shunt-resistors to measure the current for each supply-voltage
* Input protection circuit; probably consists of a fuse and a diode OR a fuse and an electronic switch (switch only closes when the input voltage has the right polarity).

The board itself will have a:
* An ATX 20pin power connector attached to its PCB, so it plugs in directly on Atlas

OR

* An ATX 20pin power connector attached to a short cable and mounting brackets which can be used to mount Tiny Demeter on the mounting holes of Atlas

The proposed schematic block-diagram can be found below:

== Blockdiagram ==

Tiny Demeter block-diagram

[[Image:TinyDemeter2.jpg]]

DEMETER

2008-06-13T09:59:46Z

PE1RGE:

== Demeter - HPSDR Power Supply & Tiny Demeter ==

Project Leader: Jeroen, PE1RGE

"Demeter" is the project-name for the HPSDR power supply. Although power supplies are widely available, Demeter will be specifically designed for the HPSDR project.

On the 13th of June 2008, Tiny Demeter is added to the Demeter page. Tiny Demeter has a simpler design. Tiny Demeter will be more suitable for experimenters and allowd us to gain some experience before constructing Demeter.

Further information will be presented on this page when it becomes available.

73 Jeroen PE1RGE

Result of the discussion on the HPSDR mailing-list (11th June 2007):

'''DEMETER SPECIFICATIONS'''

'''Input'''
13.8 Volt DC (always 13.8 V or is there a supply range, see remark below)
110 Vac (mains)
230 Vac (mains)
Battery (13.8 Volt) input with automatic switchover

'''Input connector'''
Powerpole connector for DC 13.8 Volt
Mains connector: National standard

'''Output voltages'''
Remote switchable voltages
+5 Volt @ …. Amps
+12 Volt @ ….. Amps
-12 Volt @ ….. Amps

'''Standby supply (for GPS-engine and OCXO)'''
Constant on
+5 Volt
+15 Volt
+24 Volt (depends on OCXO used, if possible user definable/adjustable)

'''Output connector'''
ATX-connector
DIN 41612 (Atlas connectors)

'''Protection'''
Input protection (high/low voltage, polarity)
Output protection (current limiting, voltage crowbar)

'''Monitoring'''
· Input voltage
· Output voltage
· Output currents
· Temperature

'''Power supply communication'''
Atlas backplane
USB-bus
1 wire interface (controlled by a board on Atlas)
Dumb-interface using the pins T7 and T8 on the Atlas

'''Connection to the HPSDR'''
Using the ATX power connector, communication via the USB bus
Using the DIN41612 connector using the Atlas backplane for communication

'''Position of the power supply'''
On the Atlas backplane
In a separate box (outside/inside Pandora)

'''HPSDR configuration'''
Ozymandias - interface module
Mercury – receiver (5V @ 500mA, 12V @ 200mA, -12V not used)
Penelope – transmitter (5V @ 300mA, 12V @ 200mA, -12V not used))
Alexiares - RF Bandpass Filters
Gibraltar - frequency standard
Epimetheus - antenna and other switching

Measured: Ozy + Janus: +12v @ 200mA, +5v @ 180 ma, -12v @ 70 ma

'''Questions/remarks'''
Switching or Linear?
Internal/External?
Power dissipation (Convection cooling/ forced air-cooling)?
Do we need computer monitoring of voltages and currents?
Include an USB-HUB (use one of the ports for the power supply communication)?
Configuration (to use or not to use the SDR-1000)? People who use it in combination with the
SDR-1000 need less power from the power-supply and are using a custom built supply or the SDR-1000
power supply.
Will the 13.8Volt really be 13.8Volt or “something” between 11.0 Volt and 15 Volt? In other
words: How many people are going to use the HPSDR mobile?

Linear (A “lot of heat”, not “green”, easy to construct and trouble-shoot)

Switching (Less heat, more “green”, more noise, more difficult to construct)

Transformers:
From my opinion there will always be a normal mains-transformer, both in the switching and the
linear power supply option. Building a switcher for 110Vac/230Vac is too dangerous and
complicated (safety regulations) for (less experienced) home-builders. The switcher will be
situated in the low-voltage part.

[[Image:demeter.jpg]]

Demeter block diagram legenda:
1. Standby transformer – Used for the GPS and OCXO
2. Standby rectifier and buffercapacitor
3. Switch – Switches between mains and battery power
4. Linear regulator
5. Overvoltage protection
6. Solid state (?) mains power switch
7. Power transformer
8. Power rectifiers and buffercapacitors (positive + negative voltage)
9. Switch – Switches between battery, mains and external power
10. Step-up converter
11. Linear regulator +12Volt
12. Overvoltage protection +12Volt
13. Charger (optional)
14. Step-down converter
15. Linear regulator +5Volt
16. Overvoltage protection +5Volt
17. Inverter – generates negative supply from the positive supply
18. Switch – Switches between inverter and mains power
19. Linear regulator –12Volt
20. Overvoltage protection –12Volt
21. Passive filter
22. Overvoltage protection for U++ (Could be used for a PA)
23. USB-Hub – one port used for communication with Demeter
24. PIC controller
25. Temperature sensor(s)
26. Analog to digital converter (for voltage and current)
27. Analog multiplexer
28. Controlled fan (forced air cooling)

'''== Tiny Demeter =='''

Based on the Teamspeak Session from 31st of June 2008 the idea arose to develop a simpler power supply. The working title for this supply became Tiny Demeter.

This supply could be handy for:
- experimenters
- people who want a simple configuration
- temporary solution unitl Demeter becomes available

Tiny Demeter uses the station power supply as main-source. It expects a fairly well regulated 13.6 till 13.8Volts.
From this voltage it will generate:
* +12V @ 1Amp
* +5V @ 1.5Amp
* -12V @ -0.3Amp

Current rating can be increased by adding multiple regulating power transistors.

The regulators for Tiny Demeter (and Demeter) will be build from discrete components. The reason for this are the following:
* It allows "current scaling", by adding more power transistors the current handling can be increased
* A discrete regulator gives better temperature stability
* A discrete regulator gives lower output-noise

From the basic idea of having just a few linear regulators the following extras were added:
* Input voltage monitor; This will warn the user when the input power source voltage is too low. (If the input voltage is below a certain threshold the +12V stability cannot be guaranteed, probably causing problems in the HPSDR system.)
* Temperature regulator/monitor; Due to the nature of linear regulators the power dissipation will be around 15 Watts (without extra regulating transistors).
* Crow-bars for each supply voltage; For added safety
* Shunt-resistors to measure the current for each supply-voltage
* Input protection circuit; probably consists of a fuse and a diode OR a fuse and an electronic switch (switch only closes when the input voltage has the right polarity).

The board itself will have a:
* An ATX 20pin power connector attached to its PCB, so it plugs in directly on Atlas

OR

* An ATX 20pin power connector attached to a short cable and mounting brackets which can be used to mount Tiny Demeter on the mounting holes of Atlas

The proposed schematic block-diagram can be found below:

== Blockdiagram ==

Tiny Demeter block-diagram

[[Image:TinyDemeter.jpg]]

File:TinyDemeter.jpg

2008-06-13T09:53:49Z

PE1RGE:

DEMETER

2008-06-13T09:52:54Z

PE1RGE: /* Blockdiagram */

== Demeter - HPSDR Power Supply & Tiny Demeter ==

Project Leader: Jeroen, PE1RGE

"Demeter" is the project-name for the HPSDR power supply. Although power supplies are widely available, Demeter will be specifically designed for the HPSDR project.

At this moment, 11th of June 2007, an inventory of wishes, specifiactions and ideas is made for the HPSDR-power supply. If you have any ideas, questions or suggestions, please feel free to E-mail me.

Further information will be presented on this page when it becomes available.

73 Jeroen PE1RGE

First result of the discussion on the HPSDR mailing-list (11th June 2007):

'''DEMETER SPECIFICATIONS'''

'''Input'''
13.8 Volt DC (always 13.8 V or is there a supply range, see remark below)
110 Vac (mains)
230 Vac (mains)
Battery (13.8 Volt) input with automatic switchover

'''Input connector'''
Powerpole connector for DC 13.8 Volt
Mains connector: National standard

'''Output voltages'''
Remote switchable voltages
+5 Volt @ …. Amps
+12 Volt @ ….. Amps
-12 Volt @ ….. Amps

'''Standby supply (for GPS-engine and OCXO)'''
Constant on
+5 Volt
+15 Volt
+24 Volt (depends on OCXO used, if possible user definable/adjustable)

'''Output connector'''
ATX-connector
DIN 41612 (Atlas connectors)

'''Protection'''
Input protection (high/low voltage, polarity)
Output protection (current limiting, voltage crowbar)

'''Monitoring'''
· Input voltage
· Output voltage
· Output currents
· Temperature

'''Power supply communication'''
Atlas backplane
USB-bus
1 wire interface (controlled by a board on Atlas)
Dumb-interface using the pins T7 and T8 on the Atlas

'''Connection to the HPSDR'''
Using the ATX power connector, communication via the USB bus
Using the DIN41612 connector using the Atlas backplane for communication

'''Position of the power supply'''
On the Atlas backplane
In a separate box (outside/inside Pandora)

'''HPSDR configuration'''
Ozymandias - interface module
Mercury – receiver (5V @ 500mA, 12V @ 200mA, -12V not used)
Penelope – transmitter (5V @ 300mA, 12V @ 200mA, -12V not used))
Alexiares - RF Bandpass Filters
Gibraltar - frequency standard
Epimetheus - antenna and other switching

Measured: Ozy + Janus: +12v @ 200mA, +5v @ 180 ma, -12v @ 70 ma

'''Questions/remarks'''
Switching or Linear?
Internal/External?
Power dissipation (Convection cooling/ forced air-cooling)?
Do we need computer monitoring of voltages and currents?
Include an USB-HUB (use one of the ports for the power supply communication)?
Configuration (to use or not to use the SDR-1000)? People who use it in combination with the
SDR-1000 need less power from the power-supply and are using a custom built supply or the SDR-1000
power supply.
Will the 13.8Volt really be 13.8Volt or “something” between 11.0 Volt and 15 Volt? In other
words: How many people are going to use the HPSDR mobile?

Linear (A “lot of heat”, not “green”, easy to construct and trouble-shoot)

Switching (Less heat, more “green”, more noise, more difficult to construct)

Transformers:
From my opinion there will always be a normal mains-transformer, both in the switching and the
linear power supply option. Building a switcher for 110Vac/230Vac is too dangerous and
complicated (safety regulations) for (less experienced) home-builders. The switcher will be
situated in the low-voltage part.

'''== Tiny Demeter =='''

Based on the Teamspeak Session from 31st of June 2008 the idea arose to develop a simpler power supply. The working title for this supply became Tiny Demeter.

This supply could be handy for:
- experimenters
- people who want a simple configuration
- temporary solution unitl Demeter becomes available

Tiny Demeter uses the station power supply as main-source. It expects a fairly well regulated 13.6 till 13.8Volts.
From this voltage it will generate:
* +12V @ 1Amp
* +5V @ 1.5Amp
* -12V @ -0.3Amp

Current rating can be increased by adding multiple regulating power transistors.

The regulators for Tiny Demeter (and Demeter) will be build from discrete components. The reason for this are the following:
* It allows "current scaling", by adding more power transistors the current handling can be increased
* A discrete regulator gives better temperature stability
* A discrete regulator gives lower output-noise

From the basic idea of having just a few linear regulators the following extras were added:
* Input voltage monitor; This will warn the user when the input power source voltage is too low. (If the input voltage is below a certain threshold the +12V stability cannot be guaranteed, probably causing problems in the HPSDR system.)
* Temperature regulator/monitor; Due to the nature of linear regulators the power dissipation will be around 15 Watts (without extra regulating transistors).
* Crow-bars for each supply voltage; For added safety
* Shunt-resistors to measure the current for each supply-voltage
* Input protection circuit; probably consists of a fuse and a diode OR a fuse and an electronic switch (switch only closes when the input voltage has the right polarity).

The board itself will have a:
* An ATX 20pin power connector attached to its PCB, so it plugs in directly on Atlas

OR

* An ATX 20pin power connector attached to a short cable and mounting brackets which can be used to mount Tiny Demeter on the mounting holes of Atlas

The proposed schematic block-diagram can be found below:

== Blockdiagram ==

[[Image:demeter.jpg]]

Demeter block diagram legenda:
1. Standby transformer – Used for the GPS and OCXO
2. Standby rectifier and buffercapacitor
3. Switch – Switches between mains and battery power
4. Linear regulator
5. Overvoltage protection
6. Solid state (?) mains power switch
7. Power transformer
8. Power rectifiers and buffercapacitors (positive + negative voltage)
9. Switch – Switches between battery, mains and external power
10. Step-up converter
11. Linear regulator +12Volt
12. Overvoltage protection +12Volt
13. Charger (optional)
14. Step-down converter
15. Linear regulator +5Volt
16. Overvoltage protection +5Volt
17. Inverter – generates negative supply from the positive supply
18. Switch – Switches between inverter and mains power
19. Linear regulator –12Volt
20. Overvoltage protection –12Volt
21. Passive filter
22. Overvoltage protection for U++ (Could be used for a PA)
23. USB-Hub – one port used for communication with Demeter
24. PIC controller
25. Temperature sensor(s)
26. Analog to digital converter (for voltage and current)
27. Analog multiplexer
28. Controlled fan (forced air cooling)

Tiny Demeter block-diagram

[[Image:TinyDemeter.jpg]]

DEMETER

2008-06-13T09:51:30Z

PE1RGE: /* Demeter - HPSDR Power Supply */

== Demeter - HPSDR Power Supply & Tiny Demeter ==

Project Leader: Jeroen, PE1RGE

"Demeter" is the project-name for the HPSDR power supply. Although power supplies are widely available, Demeter will be specifically designed for the HPSDR project.

At this moment, 11th of June 2007, an inventory of wishes, specifiactions and ideas is made for the HPSDR-power supply. If you have any ideas, questions or suggestions, please feel free to E-mail me.

Further information will be presented on this page when it becomes available.

73 Jeroen PE1RGE

First result of the discussion on the HPSDR mailing-list (11th June 2007):

'''DEMETER SPECIFICATIONS'''

'''Input'''
13.8 Volt DC (always 13.8 V or is there a supply range, see remark below)
110 Vac (mains)
230 Vac (mains)
Battery (13.8 Volt) input with automatic switchover

'''Input connector'''
Powerpole connector for DC 13.8 Volt
Mains connector: National standard

'''Output voltages'''
Remote switchable voltages
+5 Volt @ …. Amps
+12 Volt @ ….. Amps
-12 Volt @ ….. Amps

'''Standby supply (for GPS-engine and OCXO)'''
Constant on
+5 Volt
+15 Volt
+24 Volt (depends on OCXO used, if possible user definable/adjustable)

'''Output connector'''
ATX-connector
DIN 41612 (Atlas connectors)

'''Protection'''
Input protection (high/low voltage, polarity)
Output protection (current limiting, voltage crowbar)

'''Monitoring'''
· Input voltage
· Output voltage
· Output currents
· Temperature

'''Power supply communication'''
Atlas backplane
USB-bus
1 wire interface (controlled by a board on Atlas)
Dumb-interface using the pins T7 and T8 on the Atlas

'''Connection to the HPSDR'''
Using the ATX power connector, communication via the USB bus
Using the DIN41612 connector using the Atlas backplane for communication

'''Position of the power supply'''
On the Atlas backplane
In a separate box (outside/inside Pandora)

'''HPSDR configuration'''
Ozymandias - interface module
Mercury – receiver (5V @ 500mA, 12V @ 200mA, -12V not used)
Penelope – transmitter (5V @ 300mA, 12V @ 200mA, -12V not used))
Alexiares - RF Bandpass Filters
Gibraltar - frequency standard
Epimetheus - antenna and other switching

Measured: Ozy + Janus: +12v @ 200mA, +5v @ 180 ma, -12v @ 70 ma

'''Questions/remarks'''
Switching or Linear?
Internal/External?
Power dissipation (Convection cooling/ forced air-cooling)?
Do we need computer monitoring of voltages and currents?
Include an USB-HUB (use one of the ports for the power supply communication)?
Configuration (to use or not to use the SDR-1000)? People who use it in combination with the
SDR-1000 need less power from the power-supply and are using a custom built supply or the SDR-1000
power supply.
Will the 13.8Volt really be 13.8Volt or “something” between 11.0 Volt and 15 Volt? In other
words: How many people are going to use the HPSDR mobile?

Linear (A “lot of heat”, not “green”, easy to construct and trouble-shoot)

Switching (Less heat, more “green”, more noise, more difficult to construct)

Transformers:
From my opinion there will always be a normal mains-transformer, both in the switching and the
linear power supply option. Building a switcher for 110Vac/230Vac is too dangerous and
complicated (safety regulations) for (less experienced) home-builders. The switcher will be
situated in the low-voltage part.

'''== Tiny Demeter =='''

Based on the Teamspeak Session from 31st of June 2008 the idea arose to develop a simpler power supply. The working title for this supply became Tiny Demeter.

This supply could be handy for:
- experimenters
- people who want a simple configuration
- temporary solution unitl Demeter becomes available

Tiny Demeter uses the station power supply as main-source. It expects a fairly well regulated 13.6 till 13.8Volts.
From this voltage it will generate:
* +12V @ 1Amp
* +5V @ 1.5Amp
* -12V @ -0.3Amp

Current rating can be increased by adding multiple regulating power transistors.

The regulators for Tiny Demeter (and Demeter) will be build from discrete components. The reason for this are the following:
* It allows "current scaling", by adding more power transistors the current handling can be increased
* A discrete regulator gives better temperature stability
* A discrete regulator gives lower output-noise

From the basic idea of having just a few linear regulators the following extras were added:
* Input voltage monitor; This will warn the user when the input power source voltage is too low. (If the input voltage is below a certain threshold the +12V stability cannot be guaranteed, probably causing problems in the HPSDR system.)
* Temperature regulator/monitor; Due to the nature of linear regulators the power dissipation will be around 15 Watts (without extra regulating transistors).
* Crow-bars for each supply voltage; For added safety
* Shunt-resistors to measure the current for each supply-voltage
* Input protection circuit; probably consists of a fuse and a diode OR a fuse and an electronic switch (switch only closes when the input voltage has the right polarity).

The board itself will have a:
* An ATX 20pin power connector attached to its PCB, so it plugs in directly on Atlas

OR

* An ATX 20pin power connector attached to a short cable and mounting brackets which can be used to mount Tiny Demeter on the mounting holes of Atlas

The proposed schematic block-diagram can be found below:

== Blockdiagram ==

[[Image:demeter.jpg]]

Demeter block diagram legenda:
1. Standby transformer – Used for the GPS and OCXO
2. Standby rectifier and buffercapacitor
3. Switch – Switches between mains and battery power
4. Linear regulator
5. Overvoltage protection
6. Solid state (?) mains power switch
7. Power transformer
8. Power rectifiers and buffercapacitors (positive + negative voltage)
9. Switch – Switches between battery, mains and external power
10. Step-up converter
11. Linear regulator +12Volt
12. Overvoltage protection +12Volt
13. Charger (optional)
14. Step-down converter
15. Linear regulator +5Volt
16. Overvoltage protection +5Volt
17. Inverter – generates negative supply from the positive supply
18. Switch – Switches between inverter and mains power
19. Linear regulator –12Volt
20. Overvoltage protection –12Volt
21. Passive filter
22. Overvoltage protection for U++ (Could be used for a PA)
23. USB-Hub – one port used for communication with Demeter
24. PIC controller
25. Temperature sensor(s)
26. Analog to digital converter (for voltage and current)
27. Analog multiplexer
28. Controlled fan (forced air cooling)

File:Demeter.jpg

2007-06-20T13:18:52Z

PE1RGE:

DEMETER

2007-06-20T13:18:20Z

PE1RGE:

== Demeter ==

Project Leader: Jeroen, PE1RGE

"Demeter" is the project-name for the HPSDR power supply. Allthough power supplies are widely available, Demeter will be specifically designed for the HPSDR project.

At this moment, 11th of June 2007, an inventory of wishes, specifiactions and ideas is made for the HPSDR-power supply. If you have any ideas, questions or suggestions, please feel free to E-mail me.

Further information will be presented on this page when it becomes available.

73 Jeroen PE1RGE

First result of the discussion on the HPSDR mailing-list (11th June 2007):

'''DEMETER SPECIFICATIONS'''

'''Input'''
13.8 Volt DC (always 13.8 V or is there a supply range, see remark below)
110 Vac (mains)
230 Vac (mains)
Battery (13.8Volt) input with automatic switchover

'''Input connector'''
Powerpole connector for DC 13.8 Volt
Mains connector: National standard

'''Output voltages'''
Remote switchable voltages
+5 Volt @ …. Amps
+ 12 Volt @ ….. Amps
-12 Volt @ ….. Amps

'''Standby supply (for GPS-engine and OCXO)'''
Constant on
+ 5 Volt
+ 15 Volt
+ 24 Volt (depends on OCXO used, if possible user definable/adjustable)

'''Output connector'''
ATX-connector
DIN 41612 (Atlas connectors)

'''Protection'''
Input protection (high/low voltage, polarity)
Output protection (current limiting, voltage crowbar)

'''Monitoring'''
· Input voltage
· Output voltage
· Output currents
· Temperature

'''Power supply communication'''
Atlas backplane
USB-bus
1 wire interface (controlled by a board on Atlas)
Dumb-interface using the pins T7 and T8 on the Atlas

'''Connection to the HPSDR'''
Using the ATX power connector, communication via the USB bus
Using the DIN41612 connector using the Atlas backplane for communication

'''Position of the power supply'''
On the Atlas backplane
In a separate box (outside/inside Pandora)

'''HPSDR configuration'''
Ozymandias - interface module
Mercury – receiver (5V @ 500mA, 12V @ 200mA, -12V not used)
Penelope – transmitter (5V @ 300mA, 12V @ 200mA, -12V not used))
Alexiares - RF Bandpass Filters
Gibraltar - frequency standard
Epimetheus - antenna and other switching

Measured: Ozy + Janus: +12v @ 200mA, +5v @ 180 ma, -12v @ 70 ma

'''Questions/remarks'''
Switching or Lineair?
Internal/External?
Power dissipation (Convection cooling/ forced air-cooling)?
Do we need computer monitoring of voltages and currents?
Include an USB-HUB (use one of the ports for the power supply communication)?
Configuration (to use or not to use the SDR-1000)? People who use it in combination with the
SDR-1000 need less power from the power-supply and are using a custom built supply or the SRD-1000
power supply.
Will the 13.8Volt really be 13.8Volt or “something” between 11.0 Volt and 15 Volt? With other
words: How many people are going to use the HPSDR mobile?

Linear (A “lot of heat”, not “green”, easy to construct and trouble-shoot)

Switching (Less heat, more “green”, more noise, more difficult to construct)

Transformers:
From my opinion there will always be a normal mains-transformer, both in the switching and the
linear power supply option. Building a switcher for 110Vac/230Vac is too dangereous and
complicated (safety regulations) for (less experienced) home-builders. The switcher will be
situated in the low-voltage part.

== Blockdiagram ==

[[Image:demeter.jpg]]

Demeter block diagram legenda:
1. Standby transformer – Used for the GPS and OCXO
2. Standby rectifier and buffercapacitor
3. Switch – Switches between mains and battery power
4. Linear regulator
5. Overvoltage protection
6. Solid state (?) mains power switch
7. Power transformer
8. Power rectifiers and buffercapacitors (positive + negative voltage)
9. Switch – Switches between battery, mains and external power
10. Step-up converter
11. Linear regulator +12Volt
12. Overvoltage protection +12Volt
13. Charger (optional)
14. Step-down converter
15. Linear regulator +5Volt
16. Overvoltage protection +5Volt
17. Inverter – generates negative supply from the positive supply
18. Switch – Switches between inverter and mains power
19. Linear regulator –12Volt
20. Overvoltage protection –12Volt
21. Passive filter
22. Overvoltage protection for U++ (Could be used for a PA)
23. USB-Hub – one port used for communication with Demeter
24. PIC controller
25. Temperature sensor(s)
26. Analog to digital converter (for voltage and current)
27. Analog multiplexer
28. Controlled fan (forced air cooling)

File:Blockrec.jpg

2007-06-20T13:16:07Z

PE1RGE:

DEMETER

2007-06-11T11:36:55Z

PE1RGE:

DEMETER

2007-06-11T11:35:53Z

PE1RGE:

== Demeter ==

Project Leader: Jeroen, PE1RGE

"Demeter" is the project-name for the HPSDR power supply. Allthough power supplies are widely available, Demeter will be specifically designed for the HPSDR project.

At this moment, 11th of June 2007, an inventory of wishes, specifiactions and ideas is made for the HPSDR-power supply. If you have any ideas, questions or suggestions, please feel free to E-mail me.

Further information will be presented on this page when it becomes available.

73 Jeroen PE1RGE

First result of the discussion on the HPSDR mailing-list (11th June 2007):

'''DEMETER SPECIFICATIONS'''

'''Input'''
13.8 Volt DC (always 13.8 V or is there a supply range, see remark below)
110 Vac (mains)
230 Vac (mains)
Battery (13.8Volt) input with automatic switchover
'''
Input connector'''
Powerpole connector for DC 13.8 Volt
Mains connector: National standard
'''
Output voltages'''
Remote switchable voltages
+5 Volt @ …. Amps
+ 12 Volt @ ….. Amps
-12 Volt @ ….. Amps
'''
Standby supply (for GPS-engine and OCXO)'''
Constant on
+ 5 Volt
+ 15 Volt
+ 24 Volt (depends on OCXO used, if possible user definable/adjustable)

'''Output connector'''
ATX-connector
DIN 41612 (Atlas connectors)
'''
Protection'''
Input protection (high/low voltage, polarity)
Output protection (current limiting, voltage crowbar)

'''Monitoring'''
· Input voltage
· Output voltage
· Output currents
· Temperature

'''Power supply communication'''
Atlas backplane
USB-bus
1 wire interface (controlled by a board on Atlas)
Dumb-interface using the pins T7 and T8 on the Atlas

'''Connection to the HPSDR'''
Using the ATX power connector, communication via the USB bus
Using the DIN41612 connector using the Atlas backplane for communication

'''Position of the power supply'''
On the Atlas backplane
In a separate box (outside/inside Pandora)

'''HPSDR configuration'''
Ozymandias - interface module
Mercury – receiver (5V @ 500mA, 12V @ 200mA, -12V not used)
Penelope – transmitter (5V @ 300mA, 12V @ 200mA, -12V not used))
Alexiares - RF Bandpass Filters
Gibraltar - frequency standard
Epimetheus - antenna and other switching

Measured: Ozy + Janus: +12v @ 200mA, +5v @ 180 ma, -12v @ 70 ma

'''Questions/remarks'''
Switching or Lineair?
Internal/External?
Power dissipation (Convection cooling/ forced air-cooling)?
Do we need computer monitoring of voltages and currents?
Include an USB-HUB (use one of the ports for the power supply communication)?
Configuration (to use or not to use the SDR-1000)? People who use it in combination with the
SDR-1000 need less power from the power-supply and are using a custom built supply or the SRD-1000
power supply.
Will the 13.8Volt really be 13.8Volt or “something” between 11.0 Volt and 15 Volt? With other
words: How many people are going to use the HPSDR mobile?

Linear (A “lot of heat”, not “green”, easy to construct and trouble-shoot)

Switching (Less heat, more “green”, more noise, more difficult to construct)

Transformers:
From my opinion there will always be a normal mains-transformer, both in the switching and the
linear power supply option. Building a switcher for 110Vac/230Vac is too dangereous and
complicated (safety regulations) for (less experienced) home-builders. The switcher will be
situated in the low-voltage part.

DEMETER

2007-06-11T11:34:22Z

PE1RGE:

== Demeter ==

Project Leader: Jeroen, PE1RGE

"Demeter" is the project-name for the HPSDR power supply. Allthough power supplies are widely available, Demeter will be specifically designed for the HPSDR project.

At this moment, 11th of June 2007, an inventory of wishes, specifiactions and ideas is made for the HPSDR-power supply. If you have any ideas, questions or suggestions, please feel free to E-mail me.

Further information will be presented on this page when it becomes available.

73 Jeroen PE1RGE

First result of the discussion on the HPSDR mailing-list (11th June 2007):

'''DEMETER SPECIFICATIONS'''

'''Input'''
13.8 Volt DC (always 13.8 V or is there a supply range, see remark below)
110 Vac (mains)
230 Vac (mains)
Battery (13.8Volt) input with automatic switchover
'''
Input connector'''
Powerpole connector for DC 13.8 Volt
Mains connector: National standard
'''
Output voltages'''
Remote switchable voltages
+5 Volt @ …. Amps
+ 12 Volt @ ….. Amps
-12 Volt @ ….. Amps
'''
Standby supply (for GPS-engine and OCXO)'''
Constant on
+ 5 Volt
+ 15 Volt
+ 24 Volt (depends on OCXO used, if possible user definable/adjustable)

'''Output connector'''
ATX-connector
DIN 41612 (Atlas connectors)
'''
Protection'''
Input protection (high/low voltage, polarity)
Output protection (current limiting, voltage crowbar)

'''Monitoring'''
· Input voltage
· Output voltage
· Output currents
· Temperature

'''Power supply communication'''
Atlas backplane
USB-bus
1 wire interface (controlled by a board on Atlas)
Dumb-interface using the pins T7 and T8 on the Atlas

'''Connection to the HPSDR'''
Using the ATX power connector, communication via the USB bus
Using the DIN41612 connector using the Atlas backplane for communication

'''Position of the power supply'''
On the Atlas backplane
In a separate box (outside/inside Pandora)

'''HPSDR configuration'''
Ozymandias - interface module
Mercury – receiver (5V @ 500mA, 12V @ 200mA, -12V not used)
Penelope – transmitter (5V @ 300mA, 12V @ 200mA, -12V not used))
Alexiares - RF Bandpass Filters
Gibraltar - frequency standard
Epimetheus - antenna and other switching

Measured: Ozy + Janus: +12v @ 200mA, +5v @ 180 ma, -12v @ 70 ma

'''Questions/remarks'''
Switching or Lineair?
Internal/External?
Power dissipation (Convection cooling/ forced air-cooling)?
Do we need computer monitoring of voltages and currents?
Include an USB-HUB (use one of the ports for the power supply communication)?
Configuration (to use or not to use the SDR-1000)? People who use it in combination with the SDR-1000 need less power from the power-supply and are using a custom built supply or the SRD-1000 power supply.
Will the 13.8Volt really be 13.8Volt or “something” between 11.0 Volt and 15 Volt? With other words: How many people are going to use the HPSDR mobile?

Linear (A “lot of heat”, not “green”, easy to construct and trouble-shoot)

Switching (Less heat, more “green”, more noise, more difficult to construct)

Transformers:
From my opinion there will always be a normal mains-transformer, both in the switching and the linear power supply option. Building a switcher for 110Vac/230Vac is too dangereous and complicated (safety regulations) for (less experienced) home-builders. The switcher will be situated in the low-voltage part.

DEMETER

2007-06-11T11:29:07Z

PE1RGE:

== Demeter ==

Project Leader: Jeroen, PE1RGE

"Demeter" is the project-name for the HPSDR power supply. Allthough power supplies are widely available, Demeter will be specifically designed for the HPSDR project.

At this moment, 11th of June 2007, an inventory of wishes, specifiactions and ideas is made for the HPSDR-power supply. If you have any ideas, questions or suggestions, please feel free to E-mail me.

Further information will be presented on this page when it becomes available.

73 Jeroen PE1RGE

First result of the discussion on the HPSDR mailing-list (11th June 2007):

'''DEMETER SPECIFICATIONS'''

'''Input'''
13.8 Volt DC (always 13.8 V or is there a supply range, see remark below)
110 Vac (mains)
230 Vac (mains)
Battery (13.8Volt) input with automatic switchover
'''
Input connector'''
Powerpole connector for DC 13.8 Volt
Mains connector: National standard
'''
Output voltages'''
Remote switchable voltages
+5 Volt @ …. Amps
+ 12 Volt @ ….. Amps
-12 Volt @ ….. Amps
'''
Standby supply (for GPS-engine and OCXO)'''
Constant on
+ 5 Volt
+ 15 Volt
+ 24 Volt (depends on OCXO used, if possible user definable/adjustable)

'''Output connector'''
ATX-connector
DIN 41612 (Atlas connectors)
'''
Protection'''
Input protection (high/low voltage, polarity)
Output protection (current limiting, voltage crowbar)

'''Monitoring'''
· Input voltage
· Output voltage
· Output currents
· Temperature

'''Power supply communication'''
Atlas backplane
USB-bus
1 wire interface (controlled by a board on Atlas)
Dumb-interface using the pins T7 and T8 on the Atlas

'''Connection to the HPSDR'''
Using the ATX power connector, communication via the USB bus
Using the DIN41612 connector using the Atlas backplane for communication

'''Position of the power supply'''
On the Atlas backplane
In a separate box (outside/inside Pandora)

'''HPSDR configuration'''
Ozymandias - interface module
Mercury – receiver (5V @ 500mA, 12V @ 200mA, -12V not used)
Penelope – transmitter (5V @ 300mA, 12V @ 200mA, -12V not used))
Alexiares - RF Bandpass Filters
Gibraltar - frequency standard
Epimetheus - antenna and other switching

Measured: Ozy + Janus: +12v @ 200mA, +5v @ 180 ma, -12v @ 70 ma

'''Questions/remarks'''
Switching or Lineair?
Internal/External?
Power dissipation (Convection cooling/ forced air-cooling)?
Do we need computer monitoring of voltages and currents?
Include an USB-HUB (use one of the ports for the power supply communication)?
Configuration (to use or not to use the SDR-1000)? People who use it in combination with the SDR-1000 need less power from the power-supply and are using a custom built supply or the SRD-1000 power supply.
Will the 13.8Volt really be 13.8Volt or “something” between 11.0 Volt and 15 Volt? With other words: How many people are going to use the HPSDR mobile?

Linear (A “lot of heat”, not “green”, easy to construct and trouble-shoot)

Switching (Less heat, more “green”, more noise, more difficult to construct)

Transformers:
From my opinion there will always be a normal mains-transformer, both in the switching and the linear power supply option. Building a switcher for 110Vac/230Vac is too dangereous and complicated (safety regulations) for (less experienced) home-builders. The switcher will be situated in the low-voltage part.

DEMETER

2007-06-11T08:16:27Z

PE1RGE:

DEMETER

2007-06-11T08:11:49Z

PE1RGE:

== Demeter ==

Project Leader: Jeroen, PE1RGE