DEMETER - Revision history

OZ1HFT: chg

2011-04-21T20:08:08Z

chg

OZ1HFT: + Input voltage range

2011-04-21T20:00:32Z

+ Input voltage range

OZ1HFT: /* Suggestion from OZ1HFT */ chg

2011-04-21T18:55:32Z

‎Suggestion from OZ1HFT: chg

OZ1HFT: /* Suggestion from OZ1HFT */ more

2011-04-21T18:43:00Z

‎Suggestion from OZ1HFT: more

OZ1HFT: /* Suggestion from OZ1HFT */ heading level chg

2011-04-21T18:41:31Z

‎Suggestion from OZ1HFT: heading level chg

OZ1HFT: /* Crow Bar */ more

2011-04-21T18:41:01Z

‎Crow Bar: more

OZ1HFT: /* Crow Bar */ more

2011-04-21T18:38:20Z

‎Crow Bar: more

OZ1HFT: /* Suggestion from OZ1HFT */ chg

2011-04-21T17:58:28Z

‎Suggestion from OZ1HFT: chg

OZ1HFT: /* Suggestion from OZ1HFT */ chg

2011-04-21T17:56:48Z

‎Suggestion from OZ1HFT: chg

OZ1HFT: /* Suggestion from OZ1HFT */ more

2011-04-21T17:54:28Z

‎Suggestion from OZ1HFT: more

@@ Line 14: / Line 14: @@
 '''Input'''
-:13.8 Volt DC (always 13.8 V or is there a supply range, see remark below), [http://www.buchmann.ca/Chap5-page2.asp Depth of Discharge] Quote: "...The recommended end-of-discharge voltage for the SLA is 1.75V/cell..." '''1.75*6=10.5V (lowest voltage)''', [http://www.buchmann.ca/Chap4-page6.asp Charging the Lead Acid Battery] Quote: "...Correctly setting the cell-voltage limit is critical. A typical voltage limit is from 2.30V to 2.45V...",  '''2.45*6=14.7V (highest voltage)'''
+* 13.8 Volt DC (always 13.8 V or is there a supply range, see remark below)
-:110 Vac (mains)
+* 110 Vac (mains)
-:230 Vac (mains)
+* 230 Vac (mains)
-:Battery (13.8 Volt) input with automatic switchover
+* Battery (13.8 Volt) input with automatic switchover, [http://www.buchmann.ca/Chap5-page2.asp Depth of Discharge] Quote: "...The recommended end-of-discharge voltage for the SLA is 1.75V/cell..." '''1.75*6=10.5V (lowest voltage)''', [http://www.buchmann.ca/Chap4-page6.asp Charging the Lead Acid Battery] Quote: "...Correctly setting the cell-voltage limit is critical. A typical voltage limit is from 2.30V to 2.45V...",  '''2.45*6=14.7V (highest voltage)'''.
 [[Image:demeter.jpg|thumb|600px|1.	Standby transformer – Used for the GPS and OCXO
 .	Standby rectifier and buffercapacitor

@@ Line 14: / Line 14: @@
 '''Input'''
-:13.8 Volt DC (always 13.8 V or is there a supply range, see remark below)
+:13.8 Volt DC (always 13.8 V or is there a supply range, see remark below), [http://www.buchmann.ca/Chap5-page2.asp Depth of Discharge] Quote: "...The recommended end-of-discharge voltage for the SLA is 1.75V/cell..." '''1.75*6=10.5V (lowest voltage)''', [http://www.buchmann.ca/Chap4-page6.asp Charging the Lead Acid Battery] Quote: "...Correctly setting the cell-voltage limit is critical. A typical voltage limit is from 2.30V to 2.45V...",  '''2.45*6=14.7V (highest voltage)'''
 :110 Vac (mains)
 :230 Vac (mains)

@@ Line 181: / Line 181: @@
 === Suggestion from OZ1HFT ===
-I do not know if this topology makes to much noise. According to the inventor it can be designed to be low-noised. The primary patents has expired. Please consider the isolated Cuk converter, but not the Integrated Magnetics variant:
+I do not know if this topology makes to much noise. According to the inventor, it can be designed to be low-noised. The primary patents has expired. Please consider the isolated Cuk converter, but not the Integrated Magnetics variant:
 * http://en.wikipedia.org/wiki/%C4%86uk_converter
 * Other sources in english: http://da.wikipedia.org/wiki/%C4%86uk-konverter#Kilder.2Freferencer
 Highlights:
-* input and output can higher and lower than the other.
+* input and output can be higher and/or lower than the other.
 * In CCM both the input and output can be designed to pulsate as little as possible.
 * If the diode is paralleled by a switch - and the switch is paralleled by a diode the converter can be bidirectional - good when using an accumulator - also as an UPS.
 Components propositions:
-* The Cuk capacitor might be a few paralleled: (unknown if OK and low-ESR enough) CAP CER 2.2UF 100V X7R 1210: http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=587-1778-1-ND
+* The Cuk capacitor might be a few paralleled ceramic capacitors: (unknown if OK and low-ESR enough) CAP CER 2.2UF 100V X7R 1210: http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=587-1778-1-ND
 ** Ceramic capacitors are better than electrolytics and do not dry out: [http://powerelectronics.com/passive_components_packaging_interconnects/capacitors/708PET24.pdf Aug 1, 2007, powerelectronics.com: Stacked-Ceramic Caps Brave High Temperatures]
 *** [http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=587-1397-1-ND CAP CER 100UF 6.3V Y5V 1210]
 *** [http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=445-1391-1-ND CAP CER 10UF 16V Y5V 1206 Low ESR]
-* If an over-current detector is needed it could be a bead current transformer - or this cheap 65uA comparator LMV7239 with 45nS propagation delay. Another solution is to sample the MOSFET-switch on-voltage - as used in this SEPIC-smps: http://dren.dk/carpower.html
+* If an over-current detector is needed, it could be a bead current transformer - or this cheap 65uA comparator LMV7239 with 45nS propagation delay. Another solution is to sample the MOSFET-switch on-voltage - as used in this SEPIC-smps: http://dren.dk/carpower.html
 * Maybe this smps controller can be used (might not be useful for CCM...): ucc38xx - e.g. UCC3803 (4V UVLO) and UCC3802 (8V UVLO): http://focus.ti.com/docs/prod/folders/print/ucc3803.html , http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail?name=296-11466-5-ND - improved: UC3843, UCC38C43, MIC38HC43, MIC38C43, SG3843, KA3843, ISL8843, TL3843, ISL8843.
 * Maybe use this software PWM PIC-controller?:
-** GPL: [http://panteltje.com/panteltje/pic/pwr_pic/ A Microchip 16F690 PIC as universal PWM controller for power supply applications] Quote: "...Here you find the source code for a Microchip 16F690 PIC assembler program that makes that chip behave like an universal switchmode controller with LCD display...For this reason the current and voltage control is in real time, and not software dependent, other then the initialisation of the chip. No interrupts or routines in the main code are involved in the control of the output voltage or current..."
+** GPL - do not know if this is compatible with this sites copyright: [http://panteltje.com/panteltje/pic/pwr_pic/ A Microchip 16F690 PIC as universal PWM controller for power supply applications] Quote: "...Here you find the source code for a Microchip 16F690 PIC assembler program that makes that chip behave like an universal switchmode controller with LCD display...For this reason the current and voltage control is in real time, and not software dependent, other then the initialisation of the chip. No interrupts or routines in the main code are involved in the control of the output voltage or current..."
 ** [http://panteltje.com/panteltje/pic/index.html main page].

@@ Line 198: / Line 198: @@
 * Maybe this smps controller can be used (might not be useful for CCM...): ucc38xx - e.g. UCC3803 (4V UVLO) and UCC3802 (8V UVLO): http://focus.ti.com/docs/prod/folders/print/ucc3803.html , http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail?name=296-11466-5-ND - improved: UC3843, UCC38C43, MIC38HC43, MIC38C43, SG3843, KA3843, ISL8843, TL3843, ISL8843.
 * Maybe use this software PWM PIC-controller?:
-** GPL: [http://panteltje.com/panteltje/pic/pwr_pic/ A Microchip 16F690 PIC as universal PWM controller for power supply applications] Quote: "...For this reason the current and voltage control is in real time, and not software dependent, other then the initialisation of the chip. No interrupts or routines in the main code are involved in the control of the output voltage or current..."
+** GPL: [http://panteltje.com/panteltje/pic/pwr_pic/ A Microchip 16F690 PIC as universal PWM controller for power supply applications] Quote: "...Here you find the source code for a Microchip 16F690 PIC assembler program that makes that chip behave like an universal switchmode controller with LCD display...For this reason the current and voltage control is in real time, and not software dependent, other then the initialisation of the chip. No interrupts or routines in the main code are involved in the control of the output voltage or current..."
 ** [http://panteltje.com/panteltje/pic/index.html main page].

@@ Line 180: / Line 180: @@
 Please note: THIS IS NOT THE DESIGN FOR DEMETER, ONLY AN EXAMPLE OF THE TOPOLOGY.
-==== Suggestion from OZ1HFT ====
+=== Suggestion from OZ1HFT ===
 I do not know if this topology makes to much noise. According to the inventor it can be designed to be low-noised. The primary patents has expired. Please consider the isolated Cuk converter, but not the Integrated Magnetics variant:
 * http://en.wikipedia.org/wiki/%C4%86uk_converter

@@ Line 192: / Line 192: @@
 Components propositions:
 * The Cuk capacitor might be a few paralleled: (unknown if OK and low-ESR enough) CAP CER 2.2UF 100V X7R 1210: http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=587-1778-1-ND
 * If an over-current detector is needed it could be a bead current transformer - or this cheap 65uA comparator LMV7239 with 45nS propagation delay. Another solution is to sample the MOSFET-switch while on - as used in this SEPIC-smps: http://dren.dk/carpower.html
 * Maybe this smps controller can be used (might not be useful for CCM...): ucc38xx - e.g. UCC3803: http://focus.ti.com/docs/prod/folders/print/ucc3803.html , http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail?name=296-11466-5-ND - improved: UC3843, UCC38C43, MIC38HC43, MIC38C43, SG3843, KA3843, ISL8843, TL3843, ISL8843.