Novel simple topology coreless TMR array current sensor. (11th May 2021)

• Record Type: Journal Article
• Authors: Xu, X P; Liu, T Z; Zhu, M; Wangs, J G
• Is Part Of: Engineering research express. Volume 3:Number 2(2021)
• Publication Date: 2021-05-11
• Subjects: coreless -- current sensor -- TMR -- simple circuit structure; Engineering -- Periodicals; 620.005
• DOI: 10.1088/2631-8695/abfca5
• Languages: English
• ISSNs: 2631-8695

Abstract

Abstract: 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.