Hello everyone, I'm trying to simulate with Orcad Pspice a Three phase inverter with hysteresis current control.
I attached my circuit.
I did it with 3 noninverting Schmitt trigger, setting ratio R2/R1 =30 so that, as the ideal opamp has +15V output, I should have the hysteresis band width=1. The E generators have a gain=1 so that they work as a Not port. The H generators have a gain=1 so I have voltage feedback. I put two vsin with offset, on the bottom, to see the band margins.
Well, currents through the loads should follow the vsin reference (setted on 50hz, ampl=6) with a ripple depending on the band widht, but It doesn't work: current through L1 is a sine curve among 0A, the one throug L2 is among 20A, and through L3 among 20A.
Can somebody help me?
Thanks.
I attached my circuit.
I did it with 3 noninverting Schmitt trigger, setting ratio R2/R1 =30 so that, as the ideal opamp has +15V output, I should have the hysteresis band width=1. The E generators have a gain=1 so that they work as a Not port. The H generators have a gain=1 so I have voltage feedback. I put two vsin with offset, on the bottom, to see the band margins.
Well, currents through the loads should follow the vsin reference (setted on 50hz, ampl=6) with a ripple depending on the band widht, but It doesn't work: current through L1 is a sine curve among 0A, the one throug L2 is among 20A, and through L3 among 20A.
Can somebody help me?
Thanks.
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