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Multiple Power supply Guide - Page 10

post #91 of 185
this worked like a charm thanks
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post #92 of 185
Ok this is probably an old thread but I read every post as I am interested in doing this w/my [Project] Black N Blue. I am wondering what makes the power supply know to turn on and how the power button works. does the mobo have a charged capacitor that supplies low voltage/current to the power switch and when you push the momentary power button it in turn sends a signal through the already charged mobo circuits and finally sends a signal to the power supply to turn on. So my question is this. when you push the power button again it tells the mother board to turn off and that same circuit in the mobo tells the power supply to turn off. Ok if your still following me on what I'm thinking then wouldn't the mobo just supply both power supplies with the same on and off circuit with in itself. I don't understand how the power supply turns on and turns off. Is there a separate pin for the off circuit or is there some kind of temporary surge stretching all the way from the chassis power button to the power supply. If this is the case I don't see how having a jumper wire to pin 14 and 15 would hurt the mobo. If I understand it correctly the mobo only supplies a momentary current to the power supply each time power button is depressed for on or off. or is this wrong. So If both power supplies were jumped together via pins 14 and 15 then there should be no harm done. Please if you are confused by what I'm thinking then that means I'm not alone. I guess what I'm trying to figure out is the mobo suppling a constant continuity to the power supply or is it a momentary signal every time the power button is depressed? Can any one clear this up for me??? I’m hoping to turn both power supplies on and off with the push of one button, Thanks here are some of the links referenced a couple of posts earlier in this thread
http://www.burningissues.net/how_to/power/theory.htm
http://www.burningissues.net/how_to/power/adaptor.htm
Edited by N2Gaming - 11/12/08 at 10:52pm
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post #93 of 185
Quote:
Originally Posted by N2Gaming View Post
Ok this is probably an old thread but I read every post as I am interested in doing this w/my [Project] Black N Blue. I am wondering what makes the power supply know to turn on and how the power button works. does the mobo have a charged capacitor that supplies low voltage/current to the power switch and when you push the momentary power button it in turn sends a signal through the already charged mobo circuits and finally sends a signal to the power supply to turn on. So my question is this. when you push the power button again it tells the mother board to turn off and that same circuit in the mobo tells the power supply to turn off. Ok if your still following me on what I'm thinking then wouldn't the mobo just supply both power supplies with the same on and off circuit with in itself. I don't understand how the power supply turns on and turns off. Is there a separate pin for the off circuit or is there some kind of temporary surge stretching all the way from the chassis power button to the power supply. If this is the case I don't see how having a jumper wire to pin 14 and 15 would hurt the mobo. If I understand it correctly the mobo only supplies a momentary current to the power supply each time power button is depressed for on or off. or is this wrong. So If both power supplies were jumped together via pins 14 and 15 then there should be no harm done. Please if you are confused by what I'm thinking then that means I'm not alone. I guess what I'm trying to figure out is the mobo suppling a constant continuity to the power supply or is it a momentary signal every time the power button is depressed? Can any one clear this up for me??? I’m hoping to turn both power supplies on and off with the push of one button, Thanks here are some of the links referenced a couple of posts earlier in this thread
http://www.burningissues.net/how_to/power/theory.htm
http://www.burningissues.net/how_to/power/adaptor.htm
A power supply has a rail called the 5VSB (SB = stand by). This is on a separate circuit to it's main rails (12V, 5V, 3.3V). The thing with the 5VSB is that it is always on when the PSU is plugged into the outlet. It is constantly supplying power to the motherboard.

There are two ways to turn a PSU on. Either physically jump wires 14 and 15 or use a momentary switch connected to the motherboard which basically jumps wires 14 and 15. The motherboard isn't constantly supplying power to the PSU through this, is it just a circuit that is completed with a momentary switch to tell the PSU to turn on. Once a motherboard detects that the power supply is giving it power it starts its boot sequence. This may not be a completely accurate description of the motherboard/PSU relationship, but I know the way a PSU is told to turn on is through completing the 14/15 pin circuit (well, pin 14 and any ground). If you want to turn both PSUs on with the same switch, you need to use an adapter plugged in between the main PSU ATX plug and the motherboard which are not easy to find. Something like this:



It's essentially a 24-pin extension cable with an extra set of 14 and 15 pin wires spliced in. That way both PSUs get the power-on signal from the same switch.
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post #94 of 185
ok so essentially if they both turn on at the same time then they would both power off as well just from jumpers 14 & 15?
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post #95 of 185
Quote:
Originally Posted by N2Gaming View Post
ok so essentially if they both turn on at the same time then they would both power off as well just from jumpers 14 & 15?
Sorry, I explained that a little wrong. Pins 14 and 15 are not a momentary circuit. They have to be connected for the PSU to run. Once you undo that, the PSU will shut down. So, the momentary switch connected to the motherboard, triggers the mobo to complete the circuit until the momentary switch is hit again or you shut down through windows. When the mobo gets the signal to shut down, it will break the circuit and the PSU (or multiple PSUs if they are both wired to pins 14 and 15) will shut down. I hope I explained that well enough. That's sounds a little disjointed, probably could have worded it better .
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post #96 of 185
Thank you. That is the answer I was looking and hoping to get. now I just need to find out if I need some kind of resistor or diods wired in so the two power supplies can't interfear with each other and if so how to go about doing it.
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post #97 of 185
Quote:
Originally Posted by N2Gaming View Post
Thank you. That is the answer I was looking and hoping to get. now I just need to find out if I need some kind of resistor or diods wired in so the two power supplies can't interfear with each other and if so how to go about doing it.
Aside from the 14/15 pin adapter, the two PSUs don't need to be connected at any other point. Just plug your primary PSU into the main mobo connector and split up the loads from there. The big thing is where you plug each thing in. Each PSU needs to have a minimum load on the 3.3V/5V rails. The motherboard and ram will provide enough load to the primary PSU, but the secondary will need a load on the 3.3V/5V rails from HDDs or optical drives (at least 1 of each or 2 of one type for enough load). If you don't take into account the minimum load on the 3.3V/5V rails, the PSU will not operate properly and the lifespan will be reduced, sometimes drastically. Once you have ensured that each PSU is getting enough 3.3V/5V, split up the components that rely on 12V proportional to what each PSU can provide. This would be things like fans, 4/8-pin CPU and gfx cards. Once again, both PSUs need some kind of 12V load much like the 3.3V/5V rails. If you need help, just list what you want to run and I could help split the loads up for ya.
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post #98 of 185
I think I get it. so as long as primary psu has all 3/5/12v supplies under load and the secondary psu has them under load as well then both psu will be used the way they were intended/designed to be used and both psu will be happy and last longer
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post #99 of 185
Quote:
Originally Posted by N2Gaming View Post
I think I get it. so as long as primary psu has all 3/5/12v supplies under load and the secondary psu has them under load as well then both psu will be used the way they were intended/designed to be used and both psu will be happy and last longer
Bingo
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post #100 of 185
was his name oh
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