PC SMPS in to Constant current charger

I don't know about simple.... but the isolated opto diode feedback used to regulate the voltage on the output could always be modified to monitor the output current and so convert the power supply into a semi-constant current supply...

Not easy though as the components will have been specified for a constant voltage output...

John.

Connect a 5V 3Pin Reg, connct a resitor in output which gives your required current.

Cnnect this set-up & your battery [not more than 5V] acrossthe +12V [this is the Max V]. ind tha 12V hi-power output be used.

If you can get less than 5V 3Pin Reg it may charge 6v battery.

I donot remember (-)12V supply's rating. If more than 1A you can make it 24V by taking (+) & (-) 12V supplies end - to end.

see the lable of your PSU Lable for ratings.

I forgot to log-in the post below was sumitted by me"

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Connect a 5V 3Pin Reg, connct a resitor in output which gives your required current.

Cnnect this set-up & your battery [not more than 5V] acrossthe +12V [this is the Max V]. ind tha 12V hi-power output be used.

If you can get less than 5V 3Pin Reg it may charge 6v battery.

I donot remember (-)12V supply's rating. If more than 1A you can make it 24V by taking (+) & (-) 12V supplies end - to end.

see the lable of your PSU Lable for ratings.

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Regards

More information is needed before you do anything...

I don't advise playing around with these 400 watt power supplies unless you definitely know what you're doing...

John.

Thank you all for useful response. I hv actually converted one PC SMPS into a Bentch PSU 13.8V 28 A. I hv connected dummy load and made it +/- 3V variable. I want to further improve it so that I can make a complete Lead-Acid battery charger, that is having CC, CV and float charge capabilities. If any one worked on this pl share u r views. A CC charger requires a load sense or else the PSU will burnout. I have even imported one PSU from china for experiments. I am not able to play much as I could not get magnetics and magnetic wire as per my requirement. It's 65KHz circuit of ATX PSU (SG3524 PWM)