反激式纹波电流系数怎么设定?

Designing The inductance of the transformer primary side Lm:

         Lm= (Vdc min * Dmax)square / (2 Pin * Fs * Krf)

Where Lm- primary inductance

F s- switching frequency

Krf- ripple factor in full load & min input voltage.

Key rule:

For discontinuous mode , set krf =1

For continuous mode, set kef < 1

If you are making flyback converter to be operated in CCM mode, just prefer to set krf between 0.25 – 0.5 for universal input range & krf = 0.4 – 0.8 for European input range.

这个是老外写的资料,是大于1还是等于1阿?

这个反激初级(储能时)电流系数，公式应为: Kp=(Iph-Ipl)/(Iph+Ipl),   0

Kp还有一个比较算单的取法公式: Kp=Ipl/Iph, 0<=Kp<1, Kp=0时为DCM, Kp<1时为连续CCM，但是不便于套用计算变压器。