Then why do you need PWM? You can just use a relay to switch on your battery of 20v when ac fails. step down your ac to 5v ac and convert it to dc and give it to mcu. if that pin is high then it means ac is present, if ac fails that pin goes low, so mcu will operate the relay and swirch on the battery.
I think he want to avoid general usage of relay. PIC sense is there AC power, if there is AC then PIC drive MosFETs for inverter, in case of AC power outage PIC start to drive MosFETs of inverter. I'm I right?
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