From what I have read, all the -5v and -12v aren't needed on todays computers, so all I really need is 3.3v, 5v and 12v.
I need around 400 to 500 watts of output power. I am trying to build a portable PC that is kind of like a notebook, but is just plugged in. I am hoping to keep the thickness of the enclosure down to about 3". The power supply is really the only thing that i am having trouble with. I could go with a 1U power supply, but I am trying to keep size down and just want the bare amount of features that I need to make it work, and besides, I like building circuits.
I have seen a few circuits for power supplys on the web but don't really know whats appropriate for a PC. I imagine I need to stay with a switching power supply since I need to keep heat output down.
I could probably build 3 "seperate" power supplies, each with their own outputs (3.3v, 5v, and 12v) if that would make things easier. It would be easier to find a spot for 3 smaller circuit boards then 1 large one, thats for sure.
The design of the PCB is probably quite a bit simpler with more flexible options when they are 3 seperate boards too.
Does anyone know of any circuits that output pretty high watts that are very effecient and produce low EMI which makes it suitable for PC use?
I imagine I probably need around 25 to 30 amps output on the 12v, 10 to 15 amps for the 5v and around 10 amps for the 3.3 volt.
Other then the ATX connector, there are a few other power connectors (video card, hard drive, 4 or 6 pin additional connector on the motherboard) where I could probably make yet additional smaller boards to help split the load.
Any thoughts?