H-bridge using only n-channel mosfets

[stube401]

I have created an H-bridge PC with 4x floating gate drivers and 4x IGBTs (see attached schematic showing half of h-bridge).

It works very nicely but I would like to replace the IGBTs with n-channel MOSFETs. However, all the H-bridge designs I've seen use n-channels on the low side and p-channels on the high side.

Since my design uses independant galvanically isolated DC-DC converters which effectively provide each of the 4x gate drivers with their own floating supply, is it possible that I can just do a simple straight swap between of the IGBTs with N-channel mosfets?

View attachment 41124

 

[Kevin Weddle]

Two N channel MOSFET's can replace the two IGBT's in your circuit. An H bridge is used to produce a polarity change across a load. If your circuit is an H bridge, then the load is what makes it an H bridge.

It looks like the voltage at the output is fixed by the zener diode, from your schematic.

 

[Hero999]

Yes, just swap the IGBTs for MOSFETs but if it's HV IGBTs are probably better.