Traditional coreless current sensors have multiple magnetic sensors, the same number of operational amplifier and analog-to-digital converter (ADC). This requires more components and basically cannot meet the practical use because of area-effective and cost-effective requirements. In this paper a novel coreless tunnel magnetoresistance (TMR) array current sensor has the characteristics of simple N-1-1 topology, light weight, and low power consumption. Three TMRs are directly connected in parallel and unified only by one programmable amplifier to directly output to meet the current measurement. A relatively simple circuit structure is adopted and a good result is obtained. Finally, the applicability of the scheme is verified by theoretical analysis and actual measurement.

传统的无芯电流传感器具有多个磁传感器、相同数量的运算放大器和模数转换器（ADC）。这需要更多的元件，由于面积效益和成本效益的要求，基本上不能满足实际使用。本文提出了一种新型无芯隧道磁阻（TMR）阵列电流传感器，具有N-1-1拓扑结构简单、重量轻、功耗低的特点。三个TMR直接并联，仅由一个可编程放大器统一直接输出，满足电流测量。采用了比较简单的电路结构，取得了较好的效果。最后通过理论分析和实际测量验证了该方案的适用性。