So the cap is around the right way (still think it's the wrong place) and the drain is less negative than the source. So that makes it a bit clearer to me now, but there is still a goodly amount of mud in my vision on this one.
Where is the pwm referenced to??.... gate and ?
The body diode is still being used as the freewheel diode, but through the impedance of the genny.... is this correct? I think a diode from drain to battery+ should do better.
........oztulesFlinders Island Australia[ Parent ]
The most negative point is genny ground, so the caps are the right way around. It would have clearer had I posted all the circuit. It's here. I've tried adding diodes but the LTSpice model never shows anything but a few microamps going thru the diode. The real circuit may be different. I like your idea of adding a diode going back to battery +. It should limit voltage at the fets to whatever the genny produces plus the drop across the diodes.
I got it working again. I trashed the idea of the pot and added 10K resistors at the base of the fets between gate and source. I was hoping to see if there was any changes with resistance. Anyway, I'm going to try to see what happens when I change PWM frequency, power caps, and inductors.[ Parent ]
