Hi Dayama,

I actually wrote the code for a customer's specific requirement and know any further development is entirely personal and my current schedule does not permit actually working on it. Currently I have a running code with fair sinewave output. However THD measurements and transient response characteristics were not done. Also to use it like a UPS I need to design a fast transfer circuit. The sugar cube relays are fast enough but fails with increasing and mixed type load. I have incorporated an interrupt based AC Fail detection circuit that checks the following:

1. Improper Line Frequency
2. Unhealthy AC-Line Voltage
3. Sudden brown/black out

When I compl



As far as the transformer issue goes I beleive it will take much time and effort which is beyond my scope right now. Also in Kolkata it is very difficult to source good quality ferrite cores.

As I told you previously we need to have a high frequency carrier and modulate it with a 50Hz sine table. (Which I am doing anyway). Use of the high frequency should theoritically be used to drive a ferrite cored transformer (read low cost light weight) so a low pass filter in the secondary should reconstruct the modulating 50Hz.

BTW I am attending the Microchip Masters Seminar at Lonavala on 29th nov. are you?

Thanks for keeping this thread alive and giving me a kick to ponder further.

Regards

Sougata