施耐德控制器TSXP572623M

施耐德控制器TSXP572623M

TSXP572623M

隔离电流和电压反馈

交流电机驱动使用由电压和电流反馈测量值组成的闭环控制系统来控制交流电机的速度和扭矩。由于电压和电流反馈需在高压侧测量，因此信号与低压控制器侧隔离。

I在电机的三相中的每相上测得的同轴相电流用于导出控制IGBTs的佳PWM模式。这些同轴相电流测量的准确性、噪声、带宽、延迟和CMTI直接影响电机的扭矩和速度输出曲线。

如图4所示，电容耦合隔离式放大器和调制器和光耦合同类产品相比，具有更少的信号传播延迟、更佳的CMTI以及更长的寿命和可靠性。

应用指南“在HEV/EV中比较基于分流和霍尔的隔离电流感应解决方案”详细比较了基于分流和基于霍尔的电流感应方法之间的隔离等级、精度、温度范围、带宽和噪声等方面。

图5所示为使用隔离式放大器进行基于分流的电流感应和基于电阻分压器的电压感应的反馈感应环路的典型框图。通过分流电阻器RSHUNT来完成对相电流的测量。

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