Dear members , I have designed push pull converter using SG3525 for pure sine wave inverter ( this is first step for it ) with specs
Input Voltage = 12 V DC
Output voltage = 300 V DC
transformer = ferrite core
Mosfets = IRFZ44N
( i didnt used any inductor at output after rectification , just used capacitor for filtration purpose )
Mine main problem that it work well under No load condition , but when i connect it to any load , a very sharp voltage drop occurs ( form 300 DC to even less then 100 V DC ) as SG3525 have used already built in feedback in sg3525 . Can you plz help me . I shall b very thankful to u all
Circuit Diagram
http://obrazki.elektroda.pl/3757925700_1379687360.png

 

Sounds like the power conversion stage is not able to cut it. I would suspect the transformer may be saturating?

You need an inductor on the output to filter the square wave pulses.

hard to analyze because you did not say what load you are putting on it.

 

Sir for testing purpose i have used 100 W bulb