在单位功率因数整流器中，利用瞬时值比较法来控制电源电流，不但控制简单，还可有效限制器件的最高开关频率。

The method of instantaneous value comparison for source current control of unity power factor rectifier possesses advantages of simplicity as well as valid restriction for maximum switching frequency.

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文章采用单位功率因数pwm整流器和斩波电路组成开关电源主体，建立以pwm整流电路为输入电路的新型开关电源。

In this paper, using unity power factor PWM rectifier and chopper circuit, it establishes a new type of switching power supply about PWM input rectifier circuit.

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PWM整流器可实现正弦的网侧电流、单位或可调的功率因数、能量的双向流动，是一种真正意义上的“绿色环保”电力电子装置。

The PWM rectifier is a "green" power electronics equipment since it offers sinusoidal input currents, unity or adjustable power factor, reversal of power flow.

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