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ATX- additional terminal

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greengenie

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Hi,

i want to add a +14V terminal to an ATX(450W). i want to use the resource of the same ATX even if that requires an external circuit.

it may require some changes in the main transformer section. maybe by changing the transformer and adding additional circuitry.

can someone help with schematic. plz let me know the changes required

thanx & regards
 

Do you need to retain the existing +12V, +5V and other voltage outputs or do you just want a +14V output? Whether you need those other voltage rails or not, how much load capacities do you need?
 

thnx for reply

yes i do need to retain all other voltage terminals and want to have an additional 14v terminal.
the load capacities for 12V and 5V are the same as that of a normal SMPS.
for +14v/3A is the requirement

regards
 

IMO the best way to go about it would be to build a switching boost (step-up) converter and boost either the +12V or +5V supply. If you didn't need to retain the existing voltages, it wouldn't be hard to make a slight modification to obtain the +14V without any external circuit.
 
thanx

suppose i dont require one 5v terminal, in that case how can i get 14v without much modification

regards
 

That's not possible. The idea was to slightly change component values in the voltage feedback circuit so that the 12V output will now produce 14V. But that will also increase the other voltages in the same ratio: +5V will become +5.83V and so on.
 

"that will also increase the other voltages in the same ratio: +5V will become +5.83V and so on"

in case the voltage changes, can we use a voltage regulation circuit at the output side of that voltage rail

regards
 

Sorry for the late reply. I didn't see your post earlier.
Yes, the other voltages can be down-regulated to their former values. But the difference is small so that using low drop-out (LDO) regulators is a must. Depending on how accurate those other voltages have to be and for which purpose you want to use them, dropping them with series diodes may also be good enough.

If you'll explain what you want to use the various voltages for, and the currents involved, we can work on trying to find a satisfactory solution.
 

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