运用平均开关建模法，建立非理想PWM开关的非线性大信号平均模型，包含全部寄生电阻和二极管的正向压降。

Using the averaged switch modeling approach, a non-linear large-signal averaged model of non-ideal PWM switch is derived, taking into account all parasitic resistances and threshold voltage of diode.

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由于变换器工作在平均电流控制的APFC系统中，本文建立了BUCBB变换器的大信号动态模型，并将BUCBB变换器中的开关元件用受控源代替。

On account of the average current control chosen in the APFC system, a large signal dynamic BUCBB model is built and all the switching elements replaced by dependent sources.

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