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Registered Member #191
Joined: Fri Feb 17 2006, 02:01AM
Location: Esbjerg Denmark
Posts: 720
by definition you can't put two voltage sources in parallel. It does depends on the construction of your psu, but my guess is it will blow up. The question is tho, why do you want to do it?
Registered Member #618
Joined: Sat Mar 31 2007, 04:15AM
Location: Us-Great Lakes
Posts: 628
I need a 12-24v 400w+ power supply for a new r\c battery pack charger, alot the users on the r\c forums say to just use the 12v line and ground but the problem is that in order to get at least a 400w 12v line one would either need to get a server psu or 650W+ pc psu, where as I knew that if you tried to use te 5v line and the 12v line in parralel it would shut down the psu since the voltage difference would make the 5v line look like a ground to the 12v line and draw too many amps there by tripping the protection circuits, but I tried to see if I could at least tie the 5v and 12v lines together with some diodes, not realy a current or power test but just to see if they could be connected without the psu shuting down. It let me power it on and I was 11.38v which is about right considering the vdrop of a diode, but I just wanted to see what thoughts you all had.
Registered Member #95
Joined: Thu Feb 09 2006, 04:57PM
Location: Norway
Posts: 1308
It works, but the diode on the 5V line will be reverse biased until the 12V line drops to 5V. So you can't squeeze any extra power out that way, because the 5V line will never contribute with any current.
Registered Member #191
Joined: Fri Feb 17 2006, 02:01AM
Location: Esbjerg Denmark
Posts: 720
Well, if the 5V section is half wave rectified, I would probably turn then into full wave first and then trim it up by playing with the feedback network.
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PC Power Supply Hacking - 50V Output
