Hi all,
I received lots of good ideas when I asked for help on my dump-load inverter (which is still going strong without blowing fets anymore (thanks again everyone )).
Now I'm building a MS inverter based on a big transformer I've managed to acquire; standard push/pull center-tapped trans setup, and I am hoping I'll be able to use it to drive inductive loads.
I've got snubbers from the fet drains to the center-tap, and MOVs and a snubber on the output of the transformer, and the SG3525 that's driving the fets is limited to about 80% duty cycle, but I was wondering if I should have something more to protect the FETS?
If I've understood correctly, when the fets turn off and current is still flowing (due to the inductive load (e.g. fridge) ) the body-diodes of the fets will conduct, limiting the voltage across the fets, but I wondered if it was safe to rely on this or if I should have additional diodes from the battery -ve to the fet Drains (i.e. parallel to the body diodes?
Or any other ideas?
The battery is 24v nominal; the fets are in parallel banks of four for each side of the trans, and they are rated 100V, 100A each.
I received lots of good ideas when I asked for help on my dump-load inverter (which is still going strong without blowing fets anymore (thanks again everyone )).
Now I'm building a MS inverter based on a big transformer I've managed to acquire; standard push/pull center-tapped trans setup, and I am hoping I'll be able to use it to drive inductive loads.
I've got snubbers from the fet drains to the center-tap, and MOVs and a snubber on the output of the transformer, and the SG3525 that's driving the fets is limited to about 80% duty cycle, but I was wondering if I should have something more to protect the FETS?
If I've understood correctly, when the fets turn off and current is still flowing (due to the inductive load (e.g. fridge) ) the body-diodes of the fets will conduct, limiting the voltage across the fets, but I wondered if it was safe to rely on this or if I should have additional diodes from the battery -ve to the fet Drains (i.e. parallel to the body diodes?
Or any other ideas?
The battery is 24v nominal; the fets are in parallel banks of four for each side of the trans, and they are rated 100V, 100A each.