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It was clear .uld be solid state not use iron core transformer.
For this low power for first stage you can easily use a push pull stage based on SG3526 . on the other hands at first you should rectify your AC voltage 220 V and then filter it with some capacitors and then make a push pull converter . you should try to have at least 500 VDC as out put of this stage . after that an H bridge with SPWM ( not PWM , just first stage will require PWM ) and then an LC filter and then a feed back path and then a rectifier and filter for feed back path to yield DC voltage , and then give this feed back voltage to the feed back input of first stage . you understand the idea ?IGBT H brige circuit with PWM controller circuit required power 500W