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移相全桥漏感的相关疑问

Other Parts Discussed in Thread: UCC2895

我用UCC2895做移相全桥时发现个问题,就是漏感越小,轻载越不容易进入震荡或者间歇工作模式,或者增大输出电感,轻载同样越不容易进入震荡或者间歇工作模式。

查看了一些关于移相全桥的论文,都要求漏感Lr要远小于匝比的平方乘以输出电感,即Lr<<N^2*Lo,请问这是为何?