pure sine wave inverter mosfet

[pakkiboy]

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 ?

 

[israel7732]

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

 

[pakkiboy]

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