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controlSUITE内的ADC采样问题



 最近在看controlSUITE里面的HVPM_Sensorless_2833x例程,调试时,用watch window看clarke1.As,clarke1.Bs,volt1.DcBusVolt的值,如果我把电压电流互感器的电源加上,watch window里面显示值三个为0.0,意思就是不能读到值;如果我把电压电流互感器的电源断了,watch window里面三个都有值。这是什么原因啊?

PS:我的AD采样端口前有放大电路,所以AD端口的输入端,值是始终大于0的,