I have built my 12 to 220 modified inverter (1000 watt).
I use ATMEGA8 and IRF3205 in my design.
I am sure about 220V and 50Hz on output.
My design almost look like this.
In addition to feedback signal.
My problem is : this inverter Destroyed my three home fans (its driver board use triacs).
Is there any way to solve this problem?
The speed control circuit using triacs in the fan expects a smooth sinewave, not the abrupt pulses of a modified sinewave.
The 10V transformer does not produce enough output voltage for the average voltage to be 220AC. The peak voltage of 220VAC is 311V but the 10V transformer produces a peak voltage of less than 12/10V x 220V= 264V. Then the average output voltage is only 187VAC.