220VAC to 12VDC, 100Amps power supply circuit.

[nraulji]

Hi,

I need to build 220VAC to 12VDC, 100Amps power supply circuit with current limiting.

I also need to biuld a 220VAC to 3VDC, 100Amps PWM output circuit. Output freq should be adjustable to 50KHz and duty cycle from 0 to 100%.
Protection for back emf is required.

I shall appreciate any suggestions.

 

[KlausST]

Hi,

a lot of information is missing.

What load is connected? sensitive electronics or just heaters?
Is the load switching? what frequency?

What voltage stabilitity related to load variotions or mains variations do you expect?

This all calls for a SMPS. to lower power dissipation you may look for synchronous (rectifying) system, instead of using diodes.

100% duty cycle is often not possible when you use high side FET drivers with standard bootstrap voltage generation.


Klaus