338 / 2022-03-15 15:43:21

Square wave current source for inductive magnetic field sensor

square wave,magnetic field sensor,Dynamic characteristics,rising time

Purpose/Aim

In order to analyze and evaluate the dynamic characteristics of inductive magnetic field sensor, the most intuitive method is the square wave response test method. It is necessary to develop a current square wave source with excellent performance for square wave response test.

Experimental/Modeling methods

In this paper, the principle analysis of square wave current source is carried out, and the structural design is carried out from the circuit parameters, cable selection, main switch design and measuring device design, and the experimental verification is completed. A suitable loop shell is developed for the through core coil, and the dynamic characteristic verification is completed.

Results/discussion

In this subject, the amplitude is 100A, the rise time is 2.8ns and the pulse width is 1 μ S current square wave source. The pulse width can be increased by increasing the length of the coaxial cable. Using the square wave source to calibrate the coil, the partial response time is 83.45ns, the experimental response time is 78.43ns, and the overshoot is 1.74%. The stabilization time is 380ns.

Conclusions

In this paper, a 100A current square wave source is developed. The coaxial cable is used to store energy to discharge the circuit. The 100 m cable can produce a pulse width of 1 μ S square wave current waveform. The shunt adopts coaxial metal parts for coaxial connection to minimize the stray inductance of the loop. The loop current amplitude can be calculated according to the charging voltage and the wave impedance of the notification cable.