光电隔离放大器HCPL-7840在电机电流采样中的应用  

Application of HCPL-7840 Isolation Amplifier in Motor Current Sensing

作　　者：李勇[1] 

机构地区：[1]中国兵器工业第五八研究所数控事业部,四川绵阳621000

出　　处：《兵工自动化》2008年第7期60-62,共3页Ordnance Industry Automation

摘　　要：一种专用于交流伺服电机电流采样的光电隔离放大器HCPL-7840,其输入取自电机任意两相的线电流,输出经偏置放大后送到AD转换器件进行变换处理。实时的电机电流通过一个外部采样电阻得到模拟电压,通过原级采样信号输入端进入芯片,在次级得到一个差分的输出电压,该差分的输出电压正比于电机的电流。An isolation amplifier HCPL-7840 was designed for motor phase current sensing, whose input comes from two phases of motor while its output is sent to AD converter after magnify. The real-time motor current acquires simulating voltage by exterior sampling resistance, and the voltage is sent to chip through the input end of positive degree sampling signals, thus a differential output voltage of the next degree is get, which is proportional to the motor current.

关 键 词：交流伺服系统 电流采样 输出电压 

分 类 号：TM306[电气工程—电机] TP271.4[自动化与计算机技术—检测技术与自动化装置]