Hardware Circuit Design of Compensation Type Hall High-Current Sensor

摘要

The traditional Hall current sensor has disadvantages of small measurement range, low accuracy level, narrow frequency range and slow response speed, which can no longer meet the practical engineering requirement. In order to meet the needs of similar sensors in the field of nuclear fusion, a zero-flux Hall current sensor is designed. Based on the principle and characteristics of zero magnetic flux, a digital drive circuit with PWM as the core is designed for it. After the Hall voltage is formed by the induction magnetic field of the Hall element, the compensation current of the secondary side is finally formed through the amplification circuit, the integral adjustment circuit, the PWM generation circuit, the power amplification circuit and the feedback circuit, so as to ensure that the Hall element is in the state of zero flux. The Test result shows that the current measurement range of the sensor is ± 30kA. the accuracy level is 0.5, the frequency range can reach 20kHz, and the reaction time is less than 5μs.