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Hi Maxpayne,
I used push-pull topology with SG3525 and regulated the output with feedback (resistive divider). Then I used PIC12F675 to provide 50Hz pulse with 80% duty cycle to provide modified square wave output.
This obviously seems to be a problem with the feedback loop. Maybe a miscalculation of resistor / capacitor value. Hard to tell without actually looking at the circuit.
I live in Sector 10.
thnks for ur reply tahmid, i have plan to shift to Uttara sctor 7. then i will show u my ckt and discuss it. I am currently detached frm power electronics for such a long time due to my job and study.......
Hi,
The output voltage is around 310v without feedback and then I adjust it as required to get 220v at the output after making it modified square wave.
MAXPAYNE said:
thnks for ur reply tahmid, i have plan to shift to Uttara sctor 7. then i will show u my ckt and discuss it. I am currently detached frm power electronics for such a long time due to my job and study.......
In my opinion you need galvanic (safety) insulation between the 12VDC and the 350V DC bus (for your full bridge). So you need a transformer. A forward converter (push pull or H-bridge) introduces low ripple currrent and has good efficiency. You can even make it zero voltage switching giving realy good efficiency.
Advantage of the full bridge DC to 350Vdc converter topology is that you don't need the center tapped transformer (with limited coupling factor between the two primary windings). A HIP4080A (or similar device) can be used as the full bridge driver at the low voltage side.
I would not recommend 400 kHz operation due to available core materials and parasitic inductance and capacitance, stay below 100kHz, but above audio range. With these lower frequencies, you don't have to drive the switches extremely fast. This reduces EMC related problems.
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