大量程霍尔电流传感器带宽检测方法研究

Research on bandwidth detection methods for large range hall current sensors

针对检测设备的限制导致不能使用不同频率的大电流对大量程霍尔电流传感器的带宽进行测试的问题,设计一种带宽检测电路并探究大量程霍尔电流传感器的带宽与测试电流大小的关系。通过带宽检测电路将直流大电流斩波可以得到不同频率的大量程脉冲测试电流,该测试电流流经霍尔电流传感器和康铜丝阵列。根据-3 dB原则比较霍尔电流传感器输出信号幅值相对康铜丝阵列的失真程度,确定霍尔电流传感器的带宽。使用30~100 A不同大小测试电流对霍尔电流传感器的带宽进行测试,结果表明测试电流大小不同,大量程霍尔电流传感器的带宽不同,且随着测试电流的增大,带宽逐渐减小。

Aiming at the problem that the bandwidth of large-range hall current sensors cannot be tested with high currents of different frequencies due to the limitation of detection equipment,a bandwidth detection circuit is designed and the relationship between the bandwidth of large-range hall current sensors and the test current is explored.A large range pulse test current of different frequencies can be obtained by chopping the DC high current through the bandwidth detection circuit,which flows through the hall current sensor and the constantan wire array.According to the-3 dB principle,the distortion degree of the output signal amplitude of the hall current sensor relative to the condon wire array is compared,and the bandwidth of the hall current sensor is determined.The bandwidth of the hall current sensor was tested by using 30~100 A test current of different sizes,and the results showed that the test current was different,the bandwidth of the large-range hall current sensor was different,and the bandwidth gradually decreased with the increase of the test current.