POWERSTAGE-DESIGNER: Calculate the shim indutor for a Phase Shifted Full Bridge Converter

Bastien Bertrand

Part Number: POWERSTAGE-DESIGNER
Other Parts Discussed in Thread: UCC28950

Hello,

I am trying to understand the sizing of the shim inductor for the PSFB.

I'm trying to use the note Application "SLUA107A".

I understand that there are 2 conditions for applying the ZVS:
1) Energy of the shim inductor > Energy of the FET capacitor + Trannsformer.
2) In relation to the Tmax and the resonant frequency.

What does Tmax correspond to? Does it correspond to the rise time of a transistor (Tdr), the rise time (Tr), or something else?

Can you shed some light on the subject? And how do you dimension the shim inductance on POWER STAGE DESIGNER?

Best regards,

10 months ago

0 Mike O' 10 months ago

TI__Guru 66135 points

Hello,

I am reviewing your inquiry and will get back to you shortly.

Regards,

+1 Mike O' 10 months ago in reply to Mike O'

TI__Guru 66135 points

Hello,

The following link will bring you to another application note that shows how to design a phase shifted full bridge with the UCC28950/1 devices.

It goes into more depth on how to select the shim inductor and setup the timing to achieve ZVS. I believe this application note should help answer your questions.

https://www.ti.com/lit/pdf/slua560

Regards,

0 Bastien Bertrand 10 months ago in reply to Mike O'

Prodigy 60 points

Hello,

Thank you for the document, I think I understood thanks to the design.

Thank you very much.

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POWERSTAGE-DESIGNER: Calculate the shim indutor for a Phase Shifted Full Bridge Converter