Server PSU Based Radio Power Supply

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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