基于二进制电抗分流器实现热电变换器共地测量

相比于传统的串联连接方式,提出了一种基于二进制电抗分流器实现热电转换器共地比较测量的方法,通过串联连接的方式实现交流电流量程扩展。二进制电抗分流器产生两路共地可自校的电流输出,为热电转换器之间进行相互比较提供已知关系的1:1电流比例;该方法可以减少电流泄漏和三通连接器串联连接的影响。基于这种共地测量方法,热电变换器结合100 mA和1 A分流器进行了实验分析,测量频率范围1~200 kHz,同时在串联模式下进行换臂测量。实验结果表明基于二进制电抗分流器和换臂法可以很好地消除泄露电流所引起的测量误差,且两种不同方法在200 kHz频率下一致性优于3 μA/A。3种不同热电变换器和分流器组合在10 mA~1 A测量电流下交流转换误差一致性优于6 μA/A。

A New Method to Compare Two Shunt-TVC Combinations at Common Ground at Frequency up to 200 kHz

Compared with the traditional series connection method,a method based on binary reactance shunt for thermoelectric converter common ground comparison measurement is proposed,so that the AC current range extension can be achieved by series connection.The method was based on binary inductive current divider(BICD)to provide two currents and compare two shunt-TVC combinations directly at common ground.This method can reduce the influence of current leakage and tee connector in series connection.Based on the common ground measurement method,the measurement between two shunt-TVC combinations with 100 mA and 1 A current shunts was done respectively at frequencies up to 200 kHz.At the same time,the measurement of the traditional exchanging position method was carried out in the series mode.The experimental results showed that the measurement error caused by leakage current can be eliminated well based on BICD and exchanging position method,and the two different methods were consistent at 200 kHz,it were better than 3μA/A.The consistency of AC conversion error of three different shunt-TVC combinations were better than 6μA/A under the current of 10 mA^1 A.