西门子6ES7321-7RD00-0AB0

6ES7321-7RD00-0AB0

连接到功率晶体管（MOSFET）的GND侧（RNF引脚）的电阻Rs是用来检测电流的电阻。内置的比较器会对该Rs产生的电压与基准电压设置引脚（Vref）的电压进行比较。当RNF引脚电压超过Vref电压时，比较器的输出变为L，并会关断供给电流的电源侧的功率晶体管。在供给或停止电流时，晶体管的ON/OFF状态会因工作模式（例如正转或反转）而异，但是不管怎样，都将由Vref、Rs和比较器来负责是否使电流流过电机的切换。

关断时间（toff）通过对振荡器（OSC）频率进行计数的方法来设置，在关断期间内电流会再生。当过了设置的关断时间时，已关断的功率晶体管将再次导通并供给电流。通过重复该过程，可以通过以Vref电压÷Rs值为峰值电流（Ipeak）的恒流控制使电机旋转。右图是表示电机电流、Rs电流和RNF电压的波形。

需要注意的是，由于在再生电流流动期间Rs中没有电流流过，因此在电流重新供给时，Rs中会产生较大的电流变化，可能会因寄生电感而产生产生较大的电压噪声，或功率晶体管的寄生电容的充电电流流过并超过Vref电压。

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