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[SOLVED] Full Bridge Phase Shift PSIM Simulation problem.

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af19

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Hello.
I simulated a zvs full bridge in psim with below specs
Vin: 280 VDC (6 pulse rectifier).
Vout: 270 VDC
Iout:5 A
Switching Transformer: 4:6 ratio.
Inductor for ZVS: 18.6 uH.
My problem is that I have a very large voltage drop after the ZVS inductor and my square wave shape changes after this inductor. I tought inductor should be a loss-less element. May
The circuit schematics and the voltage before and after the inductor are attached.
The blue figure is before the inductor and the red figure is after the inductor.
Can anyone tell me why I have this voltage drop across the inductor? and why does the voltage shape changes?
Thanks.
 

Hi,

why does the voltage shape changes?
Click to expand...
I think this is the job of the inductor here.

Can anyone tell me why I have this voltage drop across the inductor?
Click to expand...
An inductor is an impedance...every current through an impedance causes voltage...
But the voltage drop at the horizontal line maybe comes from the DC resistance of the inductor.
What's it's DC resistance?

Klaus
 

I found my problem.
This Voltage Loss was due to current ripple in my output.
The current ripple caused a voltage drop on the inductor (L.di/dt).
I used a bigger inductor in my output filter and my waveforms got much better.
 

Hi,

An ideal inductor does not reduce average (DC) voltage, it only reduces AC voltage.
Therefore I doubt your assumption is correct.

Klaus
 

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