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bq24630应用疑问

Other Parts Discussed in Thread: BQ24630

最近在用bq24630做一个给电池充电模块,,问题一个接一个,头都大了。。想问问为什么会出现如下波形:

CH1:同步buck上管驱动  CH2:同步buck下管驱动    CH4:输出到电池端的电流波形

    

输入到到电池口的波形为什么还会出现交流波形呢??