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2808复位的问题

我们公司有一个2808的板子,控制异步电机的。

我们硬件工程师测试的时候,发现按下复位键时,6路PWM波高低电平不固定。

有时候会出现两路互补PWM波都是高电平,会直通烧坏管子。

请问高手,这是怎么回事?如何解决?谢谢!