一种抑制直流大电流源纹波的新型方法  

A novel method of ripple rejection for high DC current source

作　　者：曾博[1] 李刚[1] 韩帅[1] 邓志军 姚兴茂 

机构地区：[1]广西电网公司电力科学研究院,广西南宁530023 [2]长沙天恒测控技术有限公司,湖南长沙410100

出　　处：《中国测试》2016年第2期41-44,共4页China Measurement & Test

摘　　要：提出一种抑制直流大电流源纹波的新型方法,采用双铁芯磁平衡式电流传感器,使得电感铁芯直流磁通近似为0。非晶铁芯由于其高磁导率特性可等效为一个大的电感器,而电感器的交流阻抗对直流大电流源的纹波有较大抑制作用,从而提高直流大电流源的精度。此新型方法使用双铁芯叠加体积小,电路简单,对大电流直流电流源纹波的抑制效果明显,为检定直流电能表提供更高精度大电流直流源。实践证明:该新型方法中的抑制模块可将输入纹波抑制比控制在5%左右,与传统抑制纹波方法相比,具有低损耗、低成本、高效率和易控制等特点。A novel method of current senor of double core is ripple rejection is proposed in the paper,in which Zero-flux type applied on maintaining DC magnetic flux approximately O. Due to its high permeability, amorphous core is equivalent to a large inductor with large ae impedance to suppress ripple, to improve the accuracy of DC current source. The method is not only in small volume of double core stack and simple circuit, but obviously suppress ripple in low level, in purpose to provide a higher accuracy DC source to calibrate electrical energy meters . Finally, it is proved that the level of ripple rejection is controlled around 5% with the module, compared with the traditional method, the new one is in low loss, low cost, high efficiency and easy control etc in the research.

关 键 词：磁平衡式电流传感器 电感器 交流阻抗 非晶铁芯 纹波抑制 

分 类 号：TM933.113[电气工程—电力电子与电力传动]