Hi mincing,
What is your progress? Can you apprise me regarding the sine/square wave smps inverters made in India? Do they use microcontroller?
I have solved my problems and tested my circuit and got clean/pure sine wave output at 50khz freq. I have tested 2 types of inverter- single stage smps modified sine wave inverter and dual stage pure sine wave inverter(software pwm-ed). For sine wave generation, I have used 8 pin pic 12F675. Hope to help you and others in this respect.
Thanks.