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ATX - additional terminal

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  • Power Supplies
  • Terminal
  • ATX
  • Schematic
  • Components
Last response: in Components
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December 29, 2011 2:32:27 PM

i want to add a +14V terminal to an ATX(450W). can someone help with schematic. plz let me know the changes required
Thanx

More about : atx additional terminal

a c 722 ) Power supply
December 29, 2011 3:13:58 PM

You will run out of space inside! If you need a PSU with 14volts then you need to look somewhere else since PC's use highest +12 volts!
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December 29, 2011 3:32:44 PM

rolli59 said:
You will run out of space inside! If you need a PSU with 14volts then you need to look somewhere else since PC's use highest +12 volts!



Thanks for ur reply.

i want to use the resource of the same ATX even if that requires an external circuit.
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a c 722 ) Power supply
December 29, 2011 3:34:17 PM

I belief what you are trying to do is impossible since it will need change to the PCB!
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December 29, 2011 3:46:55 PM

rolli59 said:
I belief what you are trying to do is impossible since it will need change to the PCB!


sure its tough.
i suppose we need to do some changes in the main transformer section. maybe by changing the transformer and adding additional circuitry. please advice

regards
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a b ) Power supply
December 29, 2011 4:13:25 PM

if the psu is transformer driven then you need a new one with different windings, if you do not know what that means then you should not be touching the inside of a power supply. If you could not think of the specifics of the changes required, other than changing the transformer, then you should not be doing this.

Why do you want to do it?
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December 29, 2011 4:20:45 PM


"if the psu is transformer driven then you need a new one with different windings"

can u please help me with transformer rating & settings


"if you do not know what that means then you should not be touching the inside of a power supply. If you could not think of the specifics of the changes required, other than changing the transformer, then you should not be doing this."

i do understand what i'm doing, but require some help.


"Why do you want to do it?"

want to drive a related device


thanx
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a b ) Power supply
December 29, 2011 5:17:57 PM

you need a transformer that has the ratio of 14:120 assuming your voltage is 120.

I've built a +/- 15V psu for a 240V supply. Essentially you need the transformers to bring the voltage down to 14V then a rectification circuit to turn AC to DC, and then some capacitors to smooth the DC.

On the other hand are you sure you need 14V, most 1.5V batterys are fine down to 1.3V for instance. It could be your device works down to 12V, at low loads a lot of PSU's will be over 12V slightly. perhaps even up to 12.6V. the diffence could be less than 1.5V c10%
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a c 1217 ) Power supply
December 29, 2011 5:25:01 PM

How much current are you expecting this +14VDC rail to deliver?

What is it going to be used for?
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a c 131 ) Power supply
December 29, 2011 5:45:05 PM

A 14.4V laptop power brick may be more suitable for this application.
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December 29, 2011 6:30:23 PM

13thmonkey said:
you need a transformer that has the ratio of 14:120 assuming your voltage is 120.

I've built a +/- 15V psu for a 240V supply. Essentially you need the transformers to bring the voltage down to 14V then a rectification circuit to turn AC to DC, and then some capacitors to smooth the DC.

On the other hand are you sure you need 14V, most 1.5V batterys are fine down to 1.3V for instance. It could be your device works down to 12V, at low loads a lot of PSU's will be over 12V slightly. perhaps even up to 12.6V. the diffence could be less than 1.5V c10%



"you need a transformer that has the ratio of 14:120 assuming your voltage is 120. "

its 240v/50Hz


i'm sure its 14V, 3A


thanks

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December 29, 2011 6:34:50 PM

ko888 said:
How much current are you expecting this +14VDC rail to deliver?

What is it going to be used for?



current - 3A

i have to drive a device from this

thanks
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December 29, 2011 6:53:29 PM

Onus said:
A 14.4V laptop power brick may be more suitable for this application.


thanks for the reply

using 14.4V laptop power brick i can get 14V/3A. but i need to have all the other terminals that are in the SMPS as it will be in the computer. the card that is to be driven does not have its own power supply and needs 14VDC.

regards
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December 29, 2011 7:35:56 PM

wondering if switching boost (step-up) converter can be used as an external circuit. a 12v or 5v terminal can be used as the input to this circuit that gives 14v output
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a b ) Power supply
December 29, 2011 8:23:18 PM

do you have the device, can you see if it works on 12V?
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December 30, 2011 11:18:11 AM

13thmonkey said:
do you have the device, can you see if it works on 12V?


the rated power is 14v/3A.
it does not work properly at 12V.
i need to retain all other voltage rail. that is important.

By using switching boost (step-up) converter as an external circuit, can this be accomplished.
or do i need to change certain component value in the feedback circuit to make it happen.
i'm aware that changing component values may change the output of other voltage rail in certain proportion.
is there a way around.

thanx
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!