Server PSU Based Radio Power Supply

Server PSU Based Radio Power Supply
Status	Completed
Project Lead	User:Stealthbird97

Server PSU Based Radio Power Supply

A low cost, high current power supply for Amateur Radio utilising a Server PSU.

Designs are available at Github Construction guide on the Github Wiki

Features

• Near 13.8VDC Output, 47 A (Exact specs to be determined)
• Various Fan Control Options.
• Distribution (2 Fused Anderson Powerpole connectors)
• Current Sharing / Parallelisation of 2 PSUs (2 boards required).

Tasks (Completed)

• Identify maximum voltage obtainable from supply.
  • OVP cuts in at about 13.9v, however OVP protection will trip if a 1A load is suddenly attached by 13.75v.
• Modify PSU to boost voltage 12v->13.8v (or as close as possible)
  • This is possible using a resistor between the 12v sense-return pin and ground. 260Ohm resistor suggested.
• PCB designed (See Github)
• Check EMI (Noise on outputs seems to be low, suggest using ferrites core on DC power leads)

Parts List and Costings

Type	Item	Board Marking	Cost	Link
PSU	HP DPS-600PB Server Powersupply	N/A	~£15	[1]
PCB	DPS-600 Distribution Board PCB by M0YCH	N/A	~£30 for ~10 +p&p	[2]
Connector	4*45A pcb contacts	N/A	£9.90 for 15	[3]
Connector	2* red 45A housings	N/A	£2.65 for 10	[4]
Connector	2* black 45A housings	N/A	£2.65 for 10	[5]
Connector	Amphenol FCI 51760-10201202AALF Receptacle	N/A	£3.82 each	[6]
Fuseholder	Keystone 3522	N/A	£6.56 for 100	[7]
Trimmer Resistor	1*Vishay / Sfernice 1k Trimmer T93YA102KT20	R3	£1.23 each	[8]
Trimmer Resistor	1*Vishay / Sfernice 5k Trimmer T93YA502KT20	R4	£1.23 each	[9]
Resistor	2*330ohm though hole 0.25w	R1,R2	£0.23 for 10	[10]
LED	2*3mm red/yellow	LED1,LED2	£0.24 each	[11]
Capacitor	2*0.1uF Capacitor	C1,C2	£0.0897 each	[12]
IC	LM34 Temperature Sensor (Optional)	IC1	£2.76 each	[13]

Complications

• Original PSU was going to be a Dell POWEREDGE 2950 Redundant Power Supply however upon testing this supply, voltage would not rise above 12.2v and would drop to unusable voltages under load.

Notes/Resources

• http://www.ajvde.nl/forumfoto/Server%20Power%20Supply%20Modifications.pdf
• https://www.rcgroups.com/forums/showthread.php?1005309-A-simple-high-quality-12Volt-100Amp-Power-Supply-Part1/page40
• https://www.rcgroups.com/forums/showpost.php?p=18276967&postcount=702

• http://pinoutguide.com/Power/dell_server_24_6_psu_pinout.shtml
• http://quan-diy.com/projects/benchps/hicurr.htm
• https://www.rcgroups.com/forums/showpost.php?p=18908291&postcount=844
• https://bitcointalk.org/index.php?topic=379677.520