The precondition of constructing single-stage high power factor high power supply based on flyback topology is that the release rule of transformer energy-storage is clear.

构造基于反激拓扑的单级高功率因数的大功率电源的前提是弄清变压器的储能和释放规律。

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In the no-load test of transformer, because of the low power factor and non-sinusoid current waveform, the high precision measurement is difficult.

变压器的空载试验中，由于功率因数低，空载电流不是正弦信号，高精度测量其有功功率具有一定的难度。

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