Design of Compensated Hall High Current Sensor Control System

Abstract

Based on the principle and characteristics of the zero-flux Hall current sensor, traditional Hall current sensors mostly use analog drive circuits, which have low output power, poor anti-interference ability and are inconvenient to debug. Aiming at the disadvantages of traditional sensors, a method based on the composition and technical realization of a digital drive system with DSP as the core is given. DSP is used as the main controller which combined with CPLD to realize the distribution of information. The hardware circuit of the drive system is designed that includes operational amplifier circuit, DSP processing circuit, optocoupler circuit and power amplifier circuit. Also, the system application software is designed and it includes the DSP program of the main control board, the CPLD information distribution program and the upper computer application software. Through analyzing the waveforms and data of the experimental test, the results show that the designed sensor digital drive system has good uncertainty, linearity, and anti-interference. All indicators have reached the design requirements and have a wide range of practicability.