So I think you can try replacing the burned SDC7500 with a TL494 and check the response. Hi, I compared the pinouts of your inverter IC with a more commonly available IC TL494 and they looked exactly similar. Hello sir.there are two series of 5-5 mosfets each in my inverter.so one mosfet was looking cracked.so i changed whole series of 5 which was chn 608 with chn 347.when i connected battery it was working.but whenever i put load on it.,it started switching power on off immediately.and its relay started making noise.i remove load.after few minutes.a mosfet fried again with a pop sound.and a little transistor 639 started smoking.can u determine what's the exactly problem? Wish u a happy diwali. 1) First, the generation of the oscillations, due to which the power mosfets are triggered and the process of voltage induction is able to take place across the winding of the transformer.

DC to AC Inverter, Repairing Tips In the above explanation a couple of things become very critical for obtaining correct results from an inverter. 7) The above action within the transformer secondary causes an equivalent amount of voltage and current to switch across the secondary by means of magnetic induction, resulting in the production of the required 220V or the 120V AC across the secondary winding of the transformer, as indicated in the diagram. 6) This cycle repeats continuously causing a push-pull high current conduction across the two halves of the transformer winding. 5) Identically, in the next instant when the pinB is high and PinA is low, the lower primary winding of the transformer becomes activated. 4) This situation connects the upper tap of the transformer to ground via the power device#1, which in turn causes the battery positive to pass through upper half of the transformer, energizing this section of the transformer.

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