Research on frequency response analysis and bandwidth test method of TMR current sensor

Abstract

With the development of power grid digitalization, miniaturized, highly sensitive, low-power sensors are required to provide high-precision sensing and measurement capabilities of current signals in a wide band under complex working conditions. This paper analyzes the sensing principle of TMR magnetic sensor and the frequency band response characteristics of TMR current sensor, builds a TMR sensor bandwidth test system, carries out the bandwidth and parameter test analysis of four TMR sensors with different internal resistance, verifies the frequency response characteristics of current sensors with a bandwidth of up to 5MHz, and greatly expands the application range of TMR sensors.