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Voltage correction problem in sine wave inverter

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harimelath

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sinewave correction

Hi
I have designed a sine wave inverter using a PIC16F73 µC. I have used one of the ADCs for controlling the voltage. The operatinmg freq is 8Khz. I am getting a good sine wave output but te regulation at load varaiation is very poor.
Can anybody help me in designing a good feedback circuit? My program is in assembly with a look up table. Need help in setting a good feedback control.

Thanks
Hari
 

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