Hi,
added a couple of diodes, D2 prevents the opto LED of high reverse bias if ACline disappears but DCLink stays up.
D3 prevents massive forward current in the event that ACline is still up when DCLink is down or shorted low.

Craig

The big round resistor has 306k ohms. The larger igbt in the lower right corner has 11.5 ohms from center to left leg and .5 ohms center to right leg.

Hi,
don't think those sound right.

The big (main) braking resistor should be about 36 Ohms.

Resistance measurements are not really effective with a MOSFET/IGBT.
You need to use  diode check on your multimeter, positive drain (center) negative source (right) should be close to open circuit.
Negative  drain (center) to positive source (right) should be the MOSFET body diode, about 450mV.

Would expect drain (center) to gate (left) to be close to open circuit.

Craig

I just opened up the second one i bought. No wonder it doesn't work, its completely burnt inside. Just can't have nice things.

Hi,
yeah, these things live at the 'sharp end', if anything is going to go bang its these.

Craig