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28335套件电流采集电路



在这个采集电路中,当U相下桥臂导通时测得电阻SHUNT的压降,根据欧姆定律可以算出U相电流值。当U相上桥臂导通时电阻SHUNT的压降是0但是U相是存在电流的。这时候怎么知道U相电流值呢?并且这时候0已经作为反馈值给到ADC采集了,ADC反馈这一相电流是0,这不就和实际情况违背了吗