| 光电隔离放大器HCPL-7840在电机电流采样中的应用 |
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| 引用本文： | 李勇.光电隔离放大器HCPL-7840在电机电流采样中的应用[J].兵工自动化,2008,27(7):60-62. |
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| 作者姓名： | 李勇 |
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| 作者单位： | 中国兵器工业第五八研究所,数控事业部,四川,绵阳,621000 |
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| 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。
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| 关 键 词： | 交流伺服系统 电流采样 输出电压 |
Application of HCPL-7840 Isolation Amplifier in Motor Current Sensing |
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| LI Yong.Application of HCPL-7840 Isolation Amplifier in Motor Current Sensing[J].Ordnance Industry Automation,2008,27(7):60-62. |
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| Authors: | LI Yong |
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| Affiliation: | LI Yong (Dept. of CNC Products, No. 58 Research Institute of China Ordnance Industries, Mianyang 621000, China) |
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| Abstract: | 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. |
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| Keywords: | AC servo system Current sampling Output pressure |
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