PSFB converter with resonance phenomenon

[snvl0228]

I'm designing PSFB converter and simulating with PSIM simulation tool.

Since all the components in PSIM are level 2, ESR, ESL, DCR, etc. are all included.

At this time, a resonance phenomenon occurs between the leakage inductance of the transformer and the junction capacitance of the secondary rectifier diode.

Does this phenomenon also occur in reality?

Input voltage: 800Vdc / Output Voltage 300Vdc / Switching Frequency: 100kHz / Output Power: 15kW

 

[FvM]

Does this phenomenon also occur in reality?

Most likely. Are you using realistic transformer parameters and diode models? This should answer your question?

 

[snvl0228]

Most likely. Are you using realistic transformer parameters and diode models? This should answer your question?

Yes. I mostly approximate.. Thanks..

 

[kd502]

I found that in real life such parasitic oscillations decay faster than in simulation. Real components have higher HF losses. But if you want to suppress it completely, add RC snubber.

 

[snvl0228]

I found that in real life such parasitic oscillations decay faster than in simulation. Real components have higher HF losses. But if you want to suppress it completely, add RC snubber.

You mean just ringing, right..??

 

[mtwieg]

An example waveform would be helpful in describing the problem. Could be that you just need RC snubbers across the output diodes.

 

[kd502]

You mean just ringing, right..??

Yes. Sometimes ringing in simulation take very long time to decay.

 

[snvl0228]

Yes. Sometimes ringing in simulation take very long time to decay.

Thank you. I really appreciate your advice.

 

[kd502]

In the simulation you can see something like this. Impossible in real life. Q is over 500

 

[snvl0228]

In the simulation you can see something like this. Impossible in real life. Q is over 500
View attachment 198710

Thanks. What is Q..?? Could you let me know..??

--- Updated Yesterday at 9:17 AM ---

An example waveform would be helpful in describing the problem. Could be that you just need RC snubbers across the output diodes.

Thank you. I didn't see your advice.. sorry...