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我们的单相逆变电路用的单极性PWM调制方法，一对管子高频工作，另一对低频工作，逆变电路输出波形在负向过零点处有振荡，观察四个管子的PWM驱动信号，在负向过零点处1，3管子的驱动信号有问题，我怀疑是PWM设置的问题，但是试了几种方法，始终解决不了。现把主电路图，输出电压波形，和PWM驱动信号波形发上来，烦请专家分析一下。
