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bq搭建保护电路的小疑问



我是新手,所以我问的问题可能是很小白,见谅

如图,我的困惑是

当充电时 怎么理解CHG mos打开,CHG信号给H,那么G处为H,但是mos的S 是P-,怎么能够导通,意思是G、S两极不共地,怎么能导通

当然我的想法肯定是错的,所以请大神指教

感谢哈