Difference between revisions of "LPU"

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[[Image:LPU_TOP_sm.JPG|200px|thumb|left|LPU Prototype]]
 
'''
 
'''
 
== Linear Power Unit (LPU) - HPSDR Simple Power Supply ==
 
== Linear Power Unit (LPU) - HPSDR Simple Power Supply ==
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Project Leader: Scotty WA2DFI
 
Project Leader: Scotty WA2DFI
  
"LPU" is the project-name for a simple HPSDR power supply. Although power supplies are widely available, the LPU will provide a convenient low-noise solution until the more complex Demeter power supply is completed. The LPU (as well as Demeter) are specifically designed for the HPSDR project. With the approaching release of Mercury, this is the last hardware part of a basic functional HPSDR transceiver.
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'''"LPU"''' is the project-name for a simple HPSDR power supply. Although power supplies are widely available, the LPU will provide a convenient low-noise solution until the more complex [[Demeter]] power supply is completed. The LPU (as well as Demeter) are specifically designed for the HPSDR project. With the approaching release of Mercury, this is the last hardware part of a basic functional HPSDR transceiver.
  
 
The LPU will not take the place of Demeter; it is intended as an interim solution to power HPSDR boards until Demeter is completed.
 
The LPU will not take the place of Demeter; it is intended as an interim solution to power HPSDR boards until Demeter is completed.
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All 5 LPU prototypes assembled and tested. Added pictures. Updated schematic to XA4, which matches the prototype PCBs. Except for the capacitors in parallel with C3 and C7, it is accurate for a functional unit.
 
All 5 LPU prototypes assembled and tested. Added pictures. Updated schematic to XA4, which matches the prototype PCBs. Except for the capacitors in parallel with C3 and C7, it is accurate for a functional unit.
[[Image:LPU_Top_sm.jpg|200px|thumb|left|alt text]]
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[[Image:LPU_Bot_sm.jpg|200px|thumb|left|alt text]]
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[[Image:LPU_BOT_sm.JPG|200px|thumb|left|LPU Bottom View]]
[[Image:LPU_Merc_Ozy_Atlas_sm.JPG]]
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[[Image:LPU_Merc_Ozy_Atlas_sm.JPG|200px|thumb|left|LPU in [[ATLAS Atlas]] backplane with Mercury and Ozy]]
  
 
'''Updated: (18th December 2008):'''
 
'''Updated: (18th December 2008):'''
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'''Updated: (17th December 2008):'''
 
'''Updated: (17th December 2008):'''
  
Received prototype PCBs. Parts previously ordered and all in stock.
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Received prototype PCBs. Parts previously ordered and all in stock. Many thanks to Lyle, KK7P for doing the PCB layout and edits.
  
 
'''Updated: (30th October 2008):'''
 
'''Updated: (30th October 2008):'''
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'''1 Physical'''
 
'''1 Physical'''
  
The LPU (Linear Power Unit) is a self-contained power supply board for HPSDR. It is mounted onto a 20-pin ATX connector that mates with the connector on the Atlas board.
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The LPU (Linear Power Unit) is a self-contained power supply board for HPSDR. It is mounted onto a 20-pin ATX connector that mates with the connector on the [[ATLAS|Atlas]] board.
  
 
'''2 Requirements'''
 
'''2 Requirements'''
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'''4 LPU Feature List'''
 
'''4 LPU Feature List'''
  
Input power: 12.5V – 14.5V regulated DC input
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* Input power: 12.5V – 14.5V regulated DC input
 
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* Outputs: +12V@2A, +5V@2A, +3.3V@2A (opt), -12V@100mA
Outputs: +12V@2A, +5V@2A, +3.3V@2A (opt), -12V@100mA
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* Poly fuse on each regulator input: +12, +5, +3.3V (opt), -12V regulators
 
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* Plugs into Atlas backplane ATX connector
Poly fuse on each regulator input: +12, +5, +3.3V (opt), -12V regulators
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* Mounting holes allow direct mounting to Atlas backplane
 
+
* Strap disable for -12V to reduce noise
Plugs into Atlas backplane ATX connector
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* Dual power-pole input connector
 
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* Internal dual power-pole output connector for PA or accessories
Mounting holes allow direct mounting to Atlas backplane
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* Estimated PCB size: (LxWxH): 119mm X 44mm X 40mm
 
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* Estimated overall size: (LxWxH): 137mm X 54mmX 60mm
Strap disable for -12V to reduce noise
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+
Dual power-pole input connector
+
 
+
Internal dual power-pole output connector for PA or accessories
+
 
+
Estimated PCB size: (LxWxH): 119mm X 44mm X 40mm
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Estimated overall size: (LxWxH): 137mm X 54mmX 60mm
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Schematic: [[Media:LPU_XA4.pdf]]
  
[[Image:LPU.png]]
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[[Category:Hardware available]]

Latest revision as of 13:09, 25 January 2010

LPU Prototype

Linear Power Unit (LPU) - HPSDR Simple Power Supply

Project Leader: Scotty WA2DFI

"LPU" is the project-name for a simple HPSDR power supply. Although power supplies are widely available, the LPU will provide a convenient low-noise solution until the more complex Demeter power supply is completed. The LPU (as well as Demeter) are specifically designed for the HPSDR project. With the approaching release of Mercury, this is the last hardware part of a basic functional HPSDR transceiver.

The LPU will not take the place of Demeter; it is intended as an interim solution to power HPSDR boards until Demeter is completed.

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

73, Scotty WA2DFI

Updated: (26th December 2008):

All 5 LPU prototypes assembled and tested. Added pictures. Updated schematic to XA4, which matches the prototype PCBs. Except for the capacitors in parallel with C3 and C7, it is accurate for a functional unit.

LPU Bottom View
LPU in ATLAS Atlas backplane with Mercury and Ozy

Updated: (18th December 2008):

First LPU PCB assembled. +5V and +3.3V regulator outputs oscillate. Added additional capacitance to each output by adding 47uF 10V tantalum capacitors in parallel with C3 and C7. Outputs now stable.

Updated: (17th December 2008):

Received prototype PCBs. Parts previously ordered and all in stock. Many thanks to Lyle, KK7P for doing the PCB layout and edits.

Updated: (30th October 2008):

1 Physical

The LPU (Linear Power Unit) is a self-contained power supply board for HPSDR. It is mounted onto a 20-pin ATX connector that mates with the connector on the Atlas board.

2 Requirements

HPSDR boards require power outlined in the following table.

Table1.png

3 Electrical

The LPU accepts a 12VDC regulated input and produced the following outputs:

Table2.png

The LPU does not produce -5V or any standby voltages. It ignores the ATX power-on signal and is always on. There is a jumper to shut off the -12V switching regulator when it is not needed in order to eliminate RF noise.

4 LPU Feature List

  • Input power: 12.5V – 14.5V regulated DC input
  • Outputs: +12V@2A, +5V@2A, +3.3V@2A (opt), -12V@100mA
  • Poly fuse on each regulator input: +12, +5, +3.3V (opt), -12V regulators
  • Plugs into Atlas backplane ATX connector
  • Mounting holes allow direct mounting to Atlas backplane
  • Strap disable for -12V to reduce noise
  • Dual power-pole input connector
  • Internal dual power-pole output connector for PA or accessories
  • Estimated PCB size: (LxWxH): 119mm X 44mm X 40mm
  • Estimated overall size: (LxWxH): 137mm X 54mmX 60mm

Schematic: Media:LPU_XA4.pdf