一种开环自激振荡磁通门电流传感器  

An Open-Loop Self-Oscillating Fluxgate Current Sensor

作　　者：杨晓光[1,2] 陈玫琪 贾哲 王德鑫 YANG Xiaoguang;CHEN Meiqi;JIA Zhe;WANG Dexin(State Key Laboratory of Reliability and Intelligence of Electrical Equipment Hebei University of Technology,Tianjin 300130,China,Tianjin 300130,China;Key Laboratory of Electromagnetic Field and Electrical Apparatus Reliability of Hebei Province Hebei University of Technology)

机构地区：[1]省部共建电工装备可靠性与智能化国家重点实验室(河北工业大学),天津300130 [2]河北省电磁场与电器可靠性重点实验室(河北工业大学),天津300130

出　　处：《传感技术学报》2021年第4期434-438,共5页Chinese Journal of Sensors and Actuators

摘　　要：本文提出了一种基于自激振荡磁通门技术的新型电流传感器,该传感器在开环配置下具有较高测量精度,并具有准数字的特点。建立了传感器的数学模型,与传统平均电流法数学模型相比,所建立的数学模型更加简单和精确。本文传感器的激励电路采用了基于MOSFETS的逆变电路,与传统桥式逆变激磁电路相比,该激磁电路不需要悬浮驱动,降低了控制电路的复杂性;不需要设置死区时间,不存在驱动延时,因而大大减小了因驱动电路引起的测量误差。制作了电流传感器的样机并进行了实验验证,结果表明,在测量范围0~100 A的情况下相对误差小于0.3%。This paper proposes a new current sensor based on self-oscillating fluxgate technology.The sensor has high measurement accuracy in an open-loop configuration and has quasi-digital characteristics.The mathematical model of the sensor is established.Compared with the mathematical models of the traditional average current method,this model is simpler and more accurate.The excitation circuit of the sensor in this paper uses an inverter circuit based on MOSFETS.Compared with the traditional bridge inverter excitation circuit,this excitation circuit does not need suspension drive circuit,which reduces the complexity of the control circuit.The dead time is not required for the drive circuit,there is no drive delay,thus greatly reducing the measurement error caused by drive circuit.A prototype of the current sensor is made and verified by experiments.The test results show that the relative error is less than 0.3%when the measurement range is 0-100 A.

关 键 词：电流传感器 磁通门 自激振荡磁通门 激励电路 开环 

分 类 号：TM933.1[电气工程—电力电子与电力传动]