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pure sine wave inverter mosfet

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pakkiboy

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I am working on pure sine wave inverter . i have finished frst par ( 12v DC to 300 Dc ) in second part i have used ir2101 to derive 4 irf840 ,switching freq 16 khz . but mosfets get too much hot and burnt ... any help ???? should i change driver ic ??? mosfett or what changing should i adapt . i hav used Capacitor of 33uf any help plz ?
 

please show the circuit diagram. it will make it easier to solve the problem.
 

111111111.jpg

IR2101 , Capacitor 33uf , mosfet ir840 , freq 16khz
 

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