Isolation sampling circuit of operation voltage of breaker

一种断路器操作电压的隔离采样电路

Abstract

The utility model provides an isolation sampling circuit of an operation voltage of a breaker. The isolation sampling circuit comprises a signal attenuation circuit, a signal conditioning circuit, an analog-to-digital conversion circuit and a digital isolation circuit. An operation voltage signal firstly passes through the signal attenuation circuit, and a high voltage signal is attenuated to a low voltage signal and then enters a rear stage signal conditioning circuit; the signal conditioning circuit is divided into two stages, a front stage capacitance-resistance circuit filters a high frequency interference signal, and the rear stage circuit forms a voltage follower via an operational amplifier and is used for matching input impedance and reducing output impedance; the analog to digital conversion circuit comprises a reference source chip and an analog-to-digital conversion chip, and the digital isolation circuit transmits a digital signal outputted by the analog-to-digital conversion circuit to a measuring system almost with no time delay so that the isolation sampling of the operation voltage signal is completed.
一种断路器操作电压的隔离采样电路,由信号衰减、信号调理、模数转换和数字隔离四个电路组成。操作电压信号首先经过信号衰减电路,将高电压信号衰减成低电压信号,进入后级信号调理电路;信号调理电路分为两级,前级的阻容电路滤掉高频干扰信号,后级由运放组成了一个电压跟随器,用于匹配输入阻抗,减小输出阻抗;模数转换电路由基准源芯片和模数转换芯片组成;数字隔离电路将模数转换电路输出的数字信号几乎毫无延时的传送至测量系统,完成了对操作电压信号的隔离采样。

Claims

Description

Topics

Download Full PDF Version (Non-Commercial Use)

Patent Citations (0)

    Publication numberPublication dateAssigneeTitle

NO-Patent Citations (0)

    Title

Cited By (0)

    Publication numberPublication dateAssigneeTitle