安森美-如何处理回扫转换器中的漏电元件

如何处理回扫转换器中的漏电元件AN1679/D How to deal with Leakage Elements in Flyback Converters
Prepared by: Christophe Basso ON Semiconductor Introduction http://onsemi.com

APPLICATION NOTE
Several ways exist to depict how the magnetic variables are organized within the transformer. The reluctance method keeps the analogy with our electric circuits and therefore appears easier to us nonmagnetic experts. Remember that the electrical resistance of a metallic piece tends to brake the current flow. That is to say, we impose a current variation dI (Amps) through the resistance R (W) of the metallic part by applying a voltage variation dV (Volts) across it, or
dl + dV R

It is difficult to find a good tradeoff between cost and performance when designing offline Flyback power supplies. The basic problem is the presence of th