I am having a hard time trying to make the PWM trip-zone work properly on PSIM 11.0.3. I am making a UPS project and for that I am using a F28335 DSC which I program using SimCoder.
In my board I have an error signal which I use to trigger the trip-zone of the F28335. In PSIM simulation, I have configure the 3-Phase PWM block to use this signal as trip-zone 1 / One shot, the trip action is selected to be High Impedance because I want to bring PWM signals low using 3.3k Ohm pulldown resistors connected to each PWM.
I have generated the code, compiled and run in the F28335 using CCS 8. However, when I bring the trip-zone 1 pin low (GPIO12), all the PWM pins go high, instead of high impedance. Actually, no matter which configuration I use for trip action, the PWM pins go high. I have checked the auto generated C code, and it seems that it is correctly configured (PS_SetPwm3ph1TzAct(eTZHighImpedance) and well defined in the header file. I have also tried examples (Test 3-ph sine PWM with trip-zone (cycle-by-cycle).psimsch) and (Test 3-ph sine PWM with trip-zone (one-shot).psimsch) and the same thing happens when high impedance is selected.
The only reason I can think why it is not working is some malfunction in the pre-compiled libraries (PsBios…)