基于开环增益的DCCT线性误差测量方法
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摘要
DCCT(DC current transducer)凭借其优良的性能成为直流大电流检测的关键精密设备,而传统的电流传感器线性度测量评估方法是使用更高精度级别的测量设备来完成测量、校准等工作。为了既降低DCCT线性度测试设备的要求又给出有效的线性度指标,文中分析了零磁通电流传感器的线性误差产生机制,导出了DCCT线性误差和开环增益的反比例关系,确定了一种提高DCCT线性度的方法。同时,根据DCCT的零磁通工作原理,提出一种基于开环增益的线性误差测量和估计方法。用该文提出的方法和传统的测试方法对Sinap DCCT-200A的线性度进行评估,两种方法测试结果一致,证明了该文提出的线性度测量方法的有效性,同时表明Sinap DCCT-200A的线性度优于3×10~(-6)。
With excellent performance,DCCT(DC current transducer) is considered as the key device for measuring large DC current. To measure the linearity of current measuring device in the traditional way,testing devices with higher precision level are demanded for measuring and calibrating. Aiming at measuring the linearity with lower performance on device and conditions,this work analyzed the generating mechanism of linearity error of current transducer with zero-flux,and deduced the inversely proportional relationship between linearity error and open-loop gain of DCCT. A method for improving the linearity of DCCT was proposed.Meanwhile,a linearity measuring and estimating method based on open-loop gain was proposed according to the working principle of DCCT with zero flux. The linearity of Sinap DCCT-200 A was assessed with the proposed linearity measuring method and traditional linearity testing method respectively. The consistent results validated the effectiveness of the proposed linearity measuring method. It also demonstrated that the linearity of Sinap DCCT-200 A was better than 3 ×10~(-6).
With excellent performance,DCCT(DC current transducer) is considered as the key device for measuring large DC current. To measure the linearity of current measuring device in the traditional way,testing devices with higher precision level are demanded for measuring and calibrating. Aiming at measuring the linearity with lower performance on device and conditions,this work analyzed the generating mechanism of linearity error of current transducer with zero-flux,and deduced the inversely proportional relationship between linearity error and open-loop gain of DCCT. A method for improving the linearity of DCCT was proposed.Meanwhile,a linearity measuring and estimating method based on open-loop gain was proposed according to the working principle of DCCT with zero flux. The linearity of Sinap DCCT-200 A was assessed with the proposed linearity measuring method and traditional linearity testing method respectively. The consistent results validated the effectiveness of the proposed linearity measuring method. It also demonstrated that the linearity of Sinap DCCT-200 A was better than 3 ×10~(-6).
引文
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[9]李深旺,郭志忠,张国庆,等.集磁环式光学电流互感器的自校正测量方法[J].电工技术学报,2016,31(9):197-202.
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[12]刘莉,杨银堂.高温6H-Si CCMOS运算放大器的设计[J].西北大学学报(自然科学版),2010,40(2):219-222.
[13]郭来祥.磁调制器的理论与计算(一)[J].电测与仪表,1978(6):13-21.
[14]揭秉信.磁调制器的理论分析与计算[J].仪器仪表学报,1982,3(1):57-63.
[15]孙德辉.传感器线性度计算方法的研究[J].仪器仪表标准化信息,1987(2):1-12.
[16]唐凯豪,胡红利,李林,等.基于自适应滤波法的静电传感器转速测量[J].西北大学学报(自然科学版),2016,46(4):497-500.
[17]VELASSCO-QUESADA G,ROMN-LUMBRERAS M,PREZ-DELGADO R,et al.Class H power amplifier for power saving in fluxgate current transducers[J].IEEE Sensors Journal,2016,16(8):2322-2330.
[2]陈斌,陈素颖,程健,等.高精度直流传感器DCCT标准测试系统[J].中国物理C,2008(S1):43-45.
[3]KIM S C,SHON Y G,SUNG C W,et al.High current unipolar mangnet power supply system at the Pl SII storage ring[C]∥Proceedings of IPAC 2012,2012.
[4]唐俊龙,李德明,沈天健,等.数字化电源高精密电流传感器性能影响的分析[J].传感器与微系统,2010,29(11):79-81.
[5]UNSER K B.The parametric current transformer,a beam current monitor developed for LEP[C]∥Aip Conference.American Institute of Physics,1992:226-275.
[6]王东兴,朱燕燕,李瑞,等.磁调制零磁通电流传感器状态监测方法[J].西安电子科技大学学报(自然科学版),2018,45(3):1-6.
[7]LUONG V S,NGUYEN A T,NGUYENB A T.Exchange biased spin valve-based gating flux sensor[J].Measurement,2018,115:173-177.
[8]WU Zhiyi.A wide linearity range current sensor based on piezoelectric effect[J].IEEE Sensors Journal,2017,17(11):3298-3301.
[9]李深旺,郭志忠,张国庆,等.集磁环式光学电流互感器的自校正测量方法[J].电工技术学报,2016,31(9):197-202.
[10]赵文峰.100A直流大电流标准及检定系统[J].宇航计测技术,2002,22(5):31-35.
[11]YANG Xiaoguang,LIU Hang,WANG Yuanyuan,et al.A giant magneto resistive(GMR)effect based current sensor with a toroidal magnetic core as flux concentrator and closed-loop configuration[J].IEEE Transactions on Applied Superconducttvity,2014,24(3):1-5.
[12]刘莉,杨银堂.高温6H-Si CCMOS运算放大器的设计[J].西北大学学报(自然科学版),2010,40(2):219-222.
[13]郭来祥.磁调制器的理论与计算(一)[J].电测与仪表,1978(6):13-21.
[14]揭秉信.磁调制器的理论分析与计算[J].仪器仪表学报,1982,3(1):57-63.
[15]孙德辉.传感器线性度计算方法的研究[J].仪器仪表标准化信息,1987(2):1-12.
[16]唐凯豪,胡红利,李林,等.基于自适应滤波法的静电传感器转速测量[J].西北大学学报(自然科学版),2016,46(4):497-500.
[17]VELASSCO-QUESADA G,ROMN-LUMBRERAS M,PREZ-DELGADO R,et al.Class H power amplifier for power saving in fluxgate current transducers[J].IEEE Sensors Journal,2016,16(8):2322-2330.