Help/Suggestion required for H-Bridge circuit

[xyz9915]

Hi! The attached file is a schematic of 50 Hz H-Bridge which I want to use in the final stage of an inverter. In this respect please help me either any modification in the circuit is required? the power of inverter is 500 Watts.

[areza]

a cross conduction would occur if there is a dead time in between q and –q,

search for power stage.pdf by n-channel,

[N-Channel]

Here it is..............

Couple o' suggestions:

1) I concur with areza: Include a dead-time cross-conduction lock-out circuit to eliminate the possibility of cross-conduction and subsequent catastrophic failure,

2) Depending on current drawn, change the IRF840s to IRFP450s or '460s for more current capacity.

Hope this helps.

Steve

[N-Channel]

Just for grins, here's the control stage, too.

[Eva]

Standard speed IGBT will perform better than MOSFET in that application.

[areza]

Eva

why IGBT , dont IGBT has a slow turn off (cross conduction), more over slow/fast IGBT will cost more then MOSFET,

[Eva]

At 100 switching events per second, 2us current tails are never a problem.

In that kind of square wave inverters, MOSFET tend to blow due to the heavy inrush currents of some appliances.