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If you are use sg-3524 opto collector conect with 4.7 k res wit 5 v ref pin then add 100k res in led side of opto and connect with output of ups/invertor
First you get data sheet of SG-3524 PWM IC I,m already try and make one kit with output volt control example if you set backup volt ac 240 without load and add some 100 or 200 watt load output ac volt always balance and this kit acceptable with power transistor and power mosphet
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