Well, the design is delayed right now. We have achieved following :
1. 50 Hz Sine Wave PWM via 90s2313 AVR.
2. Used this as a reference to Comparator, and another comparator input came from the Inverter transformer output.
3. Comparator interrupt is used to switch the corresponding mosfet banks on or off. Generated 220 Volts.
2. Achived regulation on resistive and inductive loads.
3. THD of output is <4% for resistive loads (Lamps) and <10% on the inductive loads (Fans).
4. The regulation is good and fast, even when the Fans were operated on dimmer, which chops off the part of the sine wave.
5. 12 volt batteries were used.
6. total cost of the components excluding the power inverter transformer and the batteries, is under US$ 15!
Battery charging etc. was not done. The project was delayed for indefinite time due to engagement in other big projects.
Regards.