Hall current sensor of digital signal output

Abstract

The invention provides a Hall current sensor with digital signal output, comprising: a power supply circuit, a magnetic core, a linear Hall element, an analog signal conditioning circuit, an AD sampling circuit, a single-chip microcomputer, and an RS485 signal output circuit; the input of the power supply circuit is a DC power supply Or the battery, the output is connected to the linear Hall element, and then output to the RS485 signal output circuit through the AD sampling circuit and the single-chip microcomputer; the analog signal conditioning circuit is powered by a DC power supply or a battery; the magnetic field generated by the magnetic core gathering current, the linear Hall element is placed in In the gap of the magnetic core, the linear Hall element senses the magnetic field strength and outputs the corresponding voltage signal; the analog signal conditioning circuit amplifies the voltage output by the linear Hall element, and adjusts the voltage signal to the level required by the AD sampling circuit; the AD sampling circuit will simulate The voltage output by the signal conditioning circuit is converted into a digital signal.

Description

technical field [0001] The invention relates to the field of electronic circuits, in particular to a Hall current sensor that outputs signals in a digital manner. Background technique [0002] At present, computer technology is widely used in the field of signal processing. A large number of sensor signals output as analog signals need to be converted into digital signals before they can be provided to computer systems for processing. Sensors that output purely analog signals also have the following disadvantages: [0003] 1. For sensors with non-linear output, if linear correction is required, the circuit is very complicated and the adjustment is difficult and the consistency is poor. [0004] 2. The signal drift caused by temperature changes seriously affects the output accuracy of the sensor, and it is difficult to compensate. [0005] 3. Long-distance transmission, the signal is easily disturbed and causes signal distortion, which affects the stability of the entire sy...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a Hall current sensor with digital signal output, which solves the problems of linear correction, difficult temperature compensation, and difficulty in connecting with a computer processing system

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