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inverter circuit using ir2101

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pakkiboy

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Dear members,
I have designed full bridge pure sine wave inverter using IR2101 with specs
Mosfets : irf740
mosfet driver : 2101
boostrap capacitor : 67 Uf
Gate to source res : 1 Kohm
main issue when i give about 125 DC to mosfet drain , pure sine wave produced
but when i give 300 V DC dirctly to make 220 V AC , sparking produced in MOSFETs ??? any idea how to overcome this issue ?? plz help
Thanks alot
 

You are not given enough information for anybody to answer your question.
As minimum, you should post the schematics of the circuit.
 

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