High-voltage isolation direct-current voltage acquisition circuit

Abstract

The invention provides a high-voltage isolation direct-current voltage acquisition circuit. The high-voltage isolation direct-current voltage acquisition circuit comprises an input voltage division module which is connected in parallel with an anode and a cathode of high voltage to be tested and used for converting the high voltage to be tested into a low-voltage signal, an analog-to-digital isolation and conversion module for converting the low-voltage signal converted by the input voltage division module into a digital voltage signal, and a signal integration module for processing the digital signal converted by the analog-to-digital isolation and conversion module to acquire an analog voltage signal. The high-voltage isolation direct-current voltage acquisition circuit realizes physical isolation of high-voltage acquisition with low cost and has high anti-jamming capability, high reliability and an adjustable voltage acquisition measuring range.

Description

technical field [0001] The invention relates to the technical field of voltage acquisition, in particular to a high-voltage isolated DC voltage acquisition circuit. Background technique [0002] In many systems, it is necessary to collect high-voltage DC voltage, but most of the current high-voltage DC voltage acquisition circuits have problems of low reliability and precision or high cost. [0003] For example, take the high-voltage DC voltage acquisition on the motor controller of hybrid electric vehicle and the motor controller of pure electric vehicle as an example to illustrate. More than 80% of the driving motors used in hybrid electric vehicles and pure electric vehicles are permanent magnet synchronous motors, and the DC bus voltage acquisition technology on the motor controller is one of the necessary conditions to realize the low-speed vector control and high-speed field-weakening control algorithms of permanent magnet synchronous motors. one. The traditional DC ...

AI Technical Summary

Problems solved by technology

The characteristics of resistive voltage division and capacitive voltage division are simple structure and low cost. The disadvantage is that the high potential is directly introduced into the acquisition system without isolation, which has poor safety performance and will cause conduction interference to the motor drive system; the advantage of voltage Hall acquisition is the acquisition Fast response, high precision, high voltage isolation, but high cost and need to provide additional dual power supply

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