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如何使PWM输出全桥驱动波形(单极性控制)

如图片这样的驱动,应该如何配置PWM那,Q1,Q2互补输出,Q3,Q4互补输出,但是现在正半周到负半周PWM有一个莫名打出来的duty。导致电压在过零点有跳变。求解