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反激Ap法选磁芯究竟是哪一条公式



请问下,反激Ap法选磁芯究竟是哪一条公式算的,网上资料很多种算法,我知道可能都是近似估计,但是有没有一个相对比较准确的计算公式来计算Ap值,从而选磁芯,AP=Ae*Aw=?