Me and my friend need to build a converter to convert from 12VDC car battery to 24VAC 50Hz fixed frequency with maximum current of 4A AC. The output AC waveform needs to be clean sinusoidal shape at 50 Hz. High efficiency is a must to extend battery life as much as possible.
My first thought was to use a small microcontroller with sinusoidal PWM using lookup table made in excel switching at 16 kHz so that the hum is beyond our ears hearing range, to drive an H-Bridge and design a small transformer to keep the size minimum. Then design an L-C low pass filter at the output to get rid of the 16kHz and get a pure 50 Hz AC voltage out.
Befrore We go this way can anyone suggest any flow in this approach, or a better idea like using a ready made chip or DC-AC converter module with these specs (stopping us from having the joy of building it!).
Don't I need to regulate the output voltage at various loads to keep it constant up to 4A load?
I think I must have an isolated feedback signal from the load, this will ruin the LUT in excel idea, then I have to use more powerful microcontroller to handle the calculations of SPWM.
Regards
Mahmood