This paper describes a new method used for controlling convert power supply, which can make the input current to be sinus waveform, and the power factor to be 1.

提出一种新的整流电源控制策略，它可以使整流电源工作时，从电网输入的电流近似为正弦波，功率因素接近1。

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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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The present invention has no intermediate DC link and thus simplified circuit, low cost, less harmonic component in the voltage anc current waveform and high power factor.

本发明所设计的波形变换方法及其装置，省去了中间直流环节，使线路得以大大简化，显著降低了成本，同时使电压、电流谐波得以减小，并可获得较高的功率因数。

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