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请问有人使用TMS320F28XX做过单相PWM整流呢?

请问有人使用TMS320F28XX做过单相PWM整流呢?我开环的将SPWM加在四个mosFET上,但是输入电流还是像二极管整流一样是脉冲波形,并且第1/4个mos非常热,请问可能是什么情况呢