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a question about flyback converter

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patrickuestc

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How to determine the current relationship between primary winding and secondary winding of flyback converter when there is an auxiliary winding? such as the top of sgp100.
 

Actually, the n*I product in freewheeling phase is shared between all three windings. Also the primary RCD snubber is consuming part of the stored energy. I suggest to estimate the amount of energy consumed by the auxilary loads and apply a correction factor for the effective output current. It's probably above 0.9 or 0.95.
 
FvM said:
Actually, the n*I product in freewheeling phase is shared between all three windings. Also the primary RCD snubber is consuming part of the stored energy. I suggest to estimate the amount of energy consumed by the auxilary loads and apply a correction factor for the effective output current. It's probably above 0.9 or 0.95.
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Thank you, FvM. I want a quantitative analysis on the current relationship between primary side and secondary side, how can I calculate it out?
 

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