- Homework Statement:
- Find the pole voltage waveform Vao.
- Relevant Equations:
- Waveform plotting based on KCL and KVL.
The answer given is d).
Seeing the problem statement, it can be concluded that the load has some inductance, and when the switches S1, S2, S3 and S4 are off, conduction takes place through the anti-parallel body diodes (freewheeling action).
Seeing the triggering pulse waveforms, S1-S4 ON, Vao= +Vdc/2
S1-S4 OFF, D2-D3 ON, Vao = -Vdc/2.
This is only seen in d). So I can eliminate a), b) and c).
But I find d) incorrect as well.
The load current at "wt=pi" is 0 as per the problem statement. This means neither the switches nor the diodes are conducting at wt=pi. So how can Vao jump from -Vdc/2 to +Vdc/2 at wt= pi?
Shouldn't it be floating at some unknown value?
What am I missing here?
Any help is appreciated.