XMC1302 measure motor current

[ASAZHANG]

Hi，

I use XMC1302 control motor(FOC), the motor phase current  contain negative. Normal set offset valtage by OPA, I have seen some  XMC references to save the OPA, and use VADC Gain, how to measure negative current.

Thanks,

Asa

[LinglingG_46 · Accepted solution]

Why do you find the  references to save the OPA?

I see the kit use the OPA from below linker:

https://www.infineon.com/cms/en/product/evaluation-boards/kit_xmc1x_ak_motor_001/

[ASAZHANG]

Hi Lingling,

感谢帮忙。

电机的电流有正有负，如果采样负电压的需要用运放加个偏置电压，转成正电压使用。看到XMC1300中ADC带有增益放大，那负电压怎样采集呢？我看到Infineon的好多电机demo上是加了外置运放的。

Thanks，

Asa