直流叠加脉冲电流波形宽频带电流传感器

Current sensor for DC superimposed with impulse current waveform

提出了一种用于测量直流叠加脉冲电流波形的电流传感器。该传感器由两个磁芯组成,一个工作于磁通门状态,另一个基于罗氏线圈原理。为了将磁通门与罗氏线圈检测技术集成在一起,引入了一个反馈绕组,有效克服了脉冲磁场与直流磁场对磁芯工作状态的影响。基于理论分析制作了样机。实验结果表明,所提出的电流传感器能有效测量直流叠加脉冲电流波形:有效测量频带为340 k Hz,直流分量的测量误差为0.6%;低频段与高频段交点处的测量误差最大,最大测量误差为1.5%。

This paper presents a current sensor for DC superimposed with impulse current waveform. The current sensor consists of two magnetic cores： one core works in fluxgate principle, and the other is based on Rogowski coil principle. A feedback winding is introduced into the sensor in order to integrate fluxgate principle with Rogowski coil technique. Introducing the feedback winding effectively overcomes the influence of the impulse magnetic field and DC magnetic field on the magnetic core working state. A prototype is developed based on the theoretical analysis. Test results show that the proposed current sensor can effectively measure DC superimposed with impulse current waveform with a wide bandwidth up to 340 kHz. The measurement error for DC is limited to 0.6% , and the maximum error is 1.5% , which is at cut-off point between the low frequency band and high frequency band.