CAJ | 학술논문

本文提出一种三相软开关PWM变流器，它具有电路结构简单，开关次数较传统变流器少的特点。电路的开关切换是以单纯的ZVS方式进行的，从而可以减少开关损耗和抑制EMI。文章阐述了变流器输入功率因数为1和输出直流电压恒定的控制方法。通过改变调制信号的调制度a和相位角φ，不但可以使输入电流和相电压保持同相位，输入电流波形为正弦波，而且可以使输出直流电压保持恒定。
본문제출일충삼상연개관PWM변류기，타구유전로결구간단，개관차수교전통변류기소적특점。전로적개관절환시이단순적ZVS방식진행적，종이가이감소개관손모화억제EMI。문장천술료변류기수입공솔인수위1화수출직류전압항정적공제방법。통과개변조제신호적조제도a화상위각φ，불단가이사수입전류화상전압보지동상위，수입전류파형위정현파，이차가이사수출직류전압보지항정。
A new three-phase PWM converter based on soft-switching isintroduced. The converter uses a minimum number of power devices, and requires less switching operations than conventional techniques. Switching is realized solely in a ZVS mode, therefore the loss is reduced and the EMI suppressed. The paper discusses control methods for maintaining a unit power factor and constant DC voltage. Changing the modulation index M and the phase angle φ keeps the input current in phase with the voltage. It also keeps the current sinusoidal, and ensures a constant output voltage.