Hi there,

What I have planned is having a sinelook up table calling periodically through timer overflow interrupt and a closed loop voltage monitoring to adjust the value of the lookup table on the fly to minimize voltage drifts and sinewave distortion. Now the problem is that the PIC takes altleast 21us for the ad conversion then comes the calculation part. Also I am unsure which PWM freq. to use (over audible range) and how to design the parallel mosfet power output stage. For overload protection I am going to use a different comparator and do a pulse by pulse limitimg through high priority interrupts. What is the best way to protect the mosfets. I don't know how to design a RCD snubber but my scope shows ringing and peaks during switch off in a normal square wave design. I beleive they are the reason for MOSFET heat up. I have searched and read quite a lot appnotes from SOA limiting to optimizing gate drive but still experience counts. So if anybody out there please help. By the way mat I don' t want a word from your source can you at least guide on the flow.

Regards

Sougata