In recent years

the tunnel magnetoresistance (TMR) current sensor technology without a magnetic ring structure has been extensively studied

but there is still a lack of its characteristic analysis in measuring impulse current. To this end

the TMR current sensor is made and experimental research is performed. Firstly

the signal processing circuit of sensors is designed in accordance with the measurement principles and output characteristics of TMR elements

and TMR element models are selected by the magnitude of current and

at the same time

the influence of installation distance and angle deviation on measurement results is analyzed

Then

the designed current sensor is subjected to the linear range calculation and bandwidth measurement. Finally

TMR current sensors are used to measure impulse currents and results are compared with measurement results of Rogowski coil and

at the same time

the output characteristics of the TMR element under the impulse magnetic field are analyzed. The experimental results show that compared with the Rogowski coil

the difference of measurement results of the TMR2104 current sensors to the impulse current peak measurement is within 1%

and difference of peak time is within 1 μs

and difference of half-peak time is within 2.2 μs. The output linear range of the TMR element becomes larger under the action of the impulse magnetic field. In case of reasonable choice of TMR element and sensors’ position

non-magnetic ring TMR current sensors can achieve accurate measurement of impulse current and volume of the sensors can be reduced.