Hacking high power switching server power supplies for amateur radio use.
Draft
Introduction
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Server power supplies are high-quality, heavy-duty, 24/7 supplies but cheap, less than AU$50. They have been modified for amateur use, particularly to turn them on and to raise the output from 12.2 V to around 13.8 V.
Mobile phone equipment also has such supplies, but at higher voltages, 24, 36, 48, 60 V. These are good for powering transmitters.
As a technique for finding information, Google the power supply model number(s), then look at images or videos for possible sites of interest. Searching images is very powerful and gets past sales sites.
Apparently, many server supplies have additional airflow to keep then cool under load, so additional cooling may be prudent.
Mobile phone equipment also has such supplies, but at higher voltages, 24, 36, 48, 60 V. These are good for powering transmitters.
As a technique for finding information, Google the power supply model number(s), then look at images or videos for possible sites of interest. Searching images is very powerful and gets past sales sites.
Apparently, many server supplies have additional airflow to keep then cool under load, so additional cooling may be prudent.
A bit of background to the supplies is considered before what I could find for specific models. Some of the links consider RF noise from these switching supplies, something that needs to be considered. Generally, they are high-quality designs with little RF noise, especially compared to laptop supplies, wall warts or common computer ATX supplies.
How much does voltage to an RF amplifier matter?
Should we sweat over 13.8 V rather than the 12.2 V of an unmodified supply? For the RA80H1415M1, an 80 W VHF RF MOSFET Amplifier Module for 12.5-volt mobile radios that operate at 144-148 MHz, the power output per V at maximum output is a bit over 10 W per V. About 15 W between 12.2 V to 13.8 V. Yes, it sounds a fair bit, but does it matter in dB? So, 100 W vs 85 W is 20 dBW v 19.3 dBW, just 0.7 dBW; undiscernible?!
Common slot power supplies
HP and others have been making hot-swappable, high efficiency, common slot power supplies since about 2003. The supplies are a standard size and all provide about 12.2 V at up to 1000 W or so.However, the pinouts of the supplies vary. All have 12 V main supply. There may be a secondary 12 V of 2 A for control circuits. Similarly there can be 3 V and 3.3 V for logic circuits. There are a range of control signals I2C bus (SCL, SDA), analog and digital state pins (OK, Fail, etc). All have a pin to turn them on and some have remote voltage sensing, discussed below.
The first task is to be able to turn the supply on, usually shorting two pins, but even that varies. Some supplies can use a breakout board that have an on/off switch, cable connectors and a voltage display. These were used for Bitcoin mining and can be bought for about $10.
The second task is to try to vary the voltage up to around 13.8 V. The simplest way is to fool the remote voltage sense, discussed below, or to find a potentiometer inside the supply to adjust output voltage. Both can be difficult as there are few schematics; but I did find one, see below.
https://sector.biz.ua/docs/power_supply_schemes/power_supply_schemes.phtml#list
https://s.eet.eu/icmedia/HP_literature_uk_en_4AA2-9669ENW.pdf
How remote sense of voltage for a power supply works.
External voltage remote sense hack
The simplest and safest way to increase the output voltage is to fool the voltage remote sense into thinking the output power supply is too low thus increasing the voltage to that desired; 13.8 V rather than 12.2 V normally. Ordinarily, it is used to adjust the voltage for lead resistance.How remote sense of voltage for a power supply works.
The general approach with the supplies is to short pins 31 and 34 to turn the power supply on. Then connect pin 32 to ground with a resistor to vary the voltage. The process differs a bit between models, so look at the specific model hacks latter in this blog post.
Schematics
Huge list of computer and server power supplies; full pdf schematicshttps://sector.biz.ua/docs/power_supply_schemes/power_supply_schemes.phtml#list
Connector
Connector FCI 10046971-001LF
Warning: These supplies are dangerous when disassembled; live and disconnected. The capacitors have mains voltages.
Datasheet for generic 12 V 1200 W similar to HP 1200 W. Gives details on using them and pin-outs.
https://www.murata.com/products/productdata/8807027081246/d1u86p-w-1600-12-hbxdc.pdf?1583754811000
Application Note for above 12 V 1200 W
https://www.murata.com/-/media/webrenewal/products/power/appnote/acan-50.pdf
Hacking the HP 1200 W to turn on and raise to 13.8 V
https://forums.qrz.com/index.php?threads/increasing-voltage-on-12v-server-power-supplies.608194/
Breakout board description and compatible power supply models
https://www.parallelminer.com/product/12-port-chain-sync-breakout-board/
Breakout board manual
https://53106-139757-raikfcquaxqncofqfm.stackpathdns.com/wp-content/uploads/2018/05/X6B-to-X12-Breakout-Board-Manual.pdf
https://ac0c.com/attachments/Got_PS__201608KCDXC.pdf
A detailed article on hacking DPS-800GB
https://pa0fri.home.xs4all.nl/Diversen/DPS-800GB%20A%20Server%20sypply/DPS-800GB%20A%20PSU%20eng.htm
https://on5vl.org/alimentation-petit-prix/
Hacking PC-ATX supplies for multiple voltages. Spanish; Google translate works.
https://www.qsl.net/l/lu9dpd//Homebrew/Modificacion_Fuentes_PC/Modificacion_Fuentes_PC.htm
Warning: These supplies are dangerous when disassembled; live and disconnected. The capacitors have mains voltages.
HP 12 V 1200 W HSTNS-PL11
Very popular for bitcoin mining, but now past the boom. There is an adaptor card available to turn the supply on and to provide a connector to graphics cards or other purposes. It also allows up to four supplies to be used in parallel.
https://www.murata.com/products/productdata/8807027081246/d1u86p-w-1600-12-hbxdc.pdf?1583754811000
Application Note for above 12 V 1200 W
https://www.murata.com/-/media/webrenewal/products/power/appnote/acan-50.pdf
Hacking the HP 1200 W to turn on and raise to 13.8 V
https://forums.qrz.com/index.php?threads/increasing-voltage-on-12v-server-power-supplies.608194/
Schematic of popular HP 1200 W
https://sector.biz.ua/docs/power_supply_schemes_10/HP_HSTNS-PL11_PS-2122-1C.pdf
https://sector.biz.ua/docs/power_supply_schemes_10/HP_HSTNS-PL11_PS-2122-1C.pdf
Breakout boards for server power supplies
Breakout boards are available for the server power supplies. They were designed to power multiple graphics cards for Bitcoin mining. The more sophisticated ones detect which model of supply they are connected to as the pinouts vary a bit as noted above. There are a number of different types available. All have 12 V but some have other voltages such as 5 V, if available from the power supply.Breakout board description and compatible power supply models
https://www.parallelminer.com/product/12-port-chain-sync-breakout-board/
Breakout board manual
https://53106-139757-raikfcquaxqncofqfm.stackpathdns.com/wp-content/uploads/2018/05/X6B-to-X12-Breakout-Board-Manual.pdf
HP 12 V 1000W DPS-800GB
Powerpoint on hacking DPS-800GB. Shows that the supplies generate little RF noise and how to reduce it even further.https://ac0c.com/attachments/Got_PS__201608KCDXC.pdf
A detailed article on hacking DPS-800GB
HP 12 V 750 W HSTNS-PL18
Hack to turn on and to adjust to 13.8 V. French; use Google translate.https://on5vl.org/alimentation-petit-prix/
Hacking PC-ATX power supplies
While hacking PC-ATX power supplies is not the main focus of this post, I include some that I have come across or have been suggested by others. It is not a comprehensive list.Hacking PC-ATX supplies for multiple voltages. Spanish; Google translate works.
https://www.qsl.net/l/lu9dpd//Homebrew/Modificacion_Fuentes_PC/Modificacion_Fuentes_PC.htm
This has been super helpful. Thanks!
ReplyDeleteWho has the voltage adjust and OVP for the other type of 1200w HP supply?
ReplyDeleteI looking any idea for chicony hp-s5601e0 power supply . Maybe schematic diagram can helping me. MNI TNX de Z31MA
ReplyDeleteVery helpfull! thanks for all the usefull links
ReplyDelete73's PA3VOS, Fokko