The magnetic flux calculation in QR flyback.

Chun Hung Chen

Prodigy 50 points

Hi TI team

I'm Andy

I'm confused about the magnetic flux calculation in QR flyback.

How to calculate the magnetic flux at on-time and rest/off time?

I think these will be balanced at a period/cycle.

thanks

4 年多前

0 Johnsin Tao 4 年多前

TI__Guru**** 308311 points

Hi
See the datasheet: www.ti.com.cn/.../technicaldocuments page25

0 Chun Hung Chen 4 年多前回复 Johnsin Tao

Prodigy 50 points

Hi
I don't see the calculation of magnetic flux in the datasheet.
I know how to calculate the current and voltage.
I design a transformer, but I don't how much the magnetic flux it created at on-time and reset at off-time.

0 Wu JW 4 年多前回复 Chun Hung Chen

TI__Genius 13420 points

Hi,

The transformer design for QR flyback just like the normal flyback transformer. You need design the transformer at the worst case.
Following is a flyback transformer design, FYI.
www.ti.com/.../snva805.pdf

0 Chun Hung Chen 4 年多前回复 Wu JW

Prodigy 50 points

Thank you

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The magnetic flux calculation in QR flyback.