|
I had an interesting failure of the DC test controller. I bumped up the voltage to 144v, precharged the capacitor bank, verified that the bank was full, and then removed the precharge resistor. I figured it would be safer to do a test just with the energy stored in the capacitor bank, not directly hooked up to the batteries. I had changed the code so that twisting the throttle to 100% corresponded to only like 6% duty, just to be safe. I gave it a tiny bit of throttle, and the gate to source signal on the oscilloscope looked perfectly clean. I turned it back to 0, and found that the capacitors were discharged. I tried to recharge the capacitor bank, but the mosfets had failed shorted!
|