一种霍尔电流传感器的电路设计

Design of Hall current sensor ciruit

为了解决霍尔电流传感器电流动态测试范围小、线性度低及频带宽度不能满足实际工程需求的问题。设计出了零磁通型霍尔电流传感器,利用零磁通原理,通过检测二次线圈的电流(反馈电流),计算一次侧电流(被测电流)的大小。采用REF232电压基准芯片为HW300B型霍尔元件提供工作电流,采用仪器放大器AD620对霍尔元件产生的霍尔电压进行放大。通过测试表明,该传感器的电流动态测试范围比同类型的传感器提高了50%,线性度可以达到输入电流的0.2%,频带宽度可以达到300 kHz。

In order to make a Hall current sensor to meet the engineering demands with larger current dynamic test range, higher linearity and wider bandwidth ,this paper proposed zero-flux type current sensor,according to the zero-flux principle,it can calculate the size of primary current （measured current） by detecting the secondary coil of the current （feedback current）. REF232 voltage reference chip was used for the HW3OOB type Hall element to provide operating current,and instrument amplifier AD620 was used to amplify the Hall voltage generated by Hall element. Test shows that the sensor range of the current dynamic test than the same types of sensors increases 50% ,linearity is up to 0.2% of input current,frequency band width is up to 300kHz.