CN103346754A

CN103346754A - Filtering isolator

Info

Publication number: CN103346754A
Application number: CN2013102092446A
Authority: CN
Inventors: 郭滨; 章永生; 钟宝华; 林贵权
Original assignee: Tianjin Northtop Information Technology Co ltd
Current assignee: Tianjin Northtop Information Technology Co ltd
Priority date: 2013-05-29
Filing date: 2013-05-29
Publication date: 2013-10-09

Abstract

In general environments, the space of the equipment has only a small amount of interference, but in some complex industrial environments, the space has a large amount of interference. If the interference signals are not subjected to isolation filtering processing, the interference signals can enter the equipment from a signal line or a power line in an induction mode, so that the normal work of the equipment is influenced; the middle part is an isolation circuit which comprises an optical coupling isolation circuit and a direct current isolation circuit, so that an external circuit and an internal circuit are isolated, interference signals are isolated outside, one type of the optical coupling isolation circuit is used for isolating switch signals, the other type of the optical coupling isolation circuit is used for isolating pulse signals, and the optical coupling does not work when no input signal exists. The direct current isolation circuit is powered by the inside of the equipment, can isolate an internal power supply from an external power supply and supplies power to the optical coupler and the outside; the third part filters the current input by the DC/DC converter to reduce interference, and finally outputs the signal to connect the power supply with the power supply inside the equipment. Therefore, the isolator has the characteristics of high-efficiency isolation and filtering, low energy consumption and wide applicability.

Description

A kind of filtering isolator

Technical field

The present invention relates to a kind of filtering isolator, can carry out isolation filter efficiently with regard to power supply to switching signal, pulse signal, low in energy consumption, have the scope of application widely.

Background technology

Therefore the development of modern electronic equipment makes to have a large amount of electromagnetic signals in the space, particularly in some complex environments, electric equipment is had very strong interference effect, to the research of EMC all the more important just.Country is more and more stricter to the requirement of equipment EMC.The design adopts comparatively simply, high-efficiency method is handled one of immunity to interference among the equipment EMC.

Summary of the invention

Technical problem to be solved by this invention is, proposes a kind ofly to have efficient, low in energy consumption and use switching signal, pulse signal and isolated from power filter widely.

The technical solution used in the present invention is: a kind of filtering isolator, include isolation module, and it is characterized in that also be provided with: the input filtration module is used for that filtering is carried out in the output of input signal and power supply and handles; The filtering output module, the power supply that is used for equipment is provided carries out filtering, and the signal after filtering is isolated is transmitted.

Described isolation module includes several light-coupled isolation interfaces, is used for isolation signals, and wherein U1 and U2 are made up of by two the two-way optocoupler respectively, be same circuits, can be designed to some groups, they play the effect of isolating switch signal, and resistance R 1, R8 and R9 play metering function at this; U3 is one road optocoupler, is used for isolating pulse signal, and R3, R10 play metering function at this, and R4 is pull-up resistor intensifier pulse signal; U4 is that 5V changes the 5VDC/DC converter, is used for the 5V power supply that xegregating unit provides, and offers photoelectric coupled circuit and external equipment; U5 is that 12V changes the 12VDC/DC converter, is used for the 12V power supply that xegregating unit provides, and offers external equipment.

Described input filtration module includes signal input interface (J1), is used for inserting external switch signal, output pulse signal and 5V, 12V; Capacitor C 8, the switching signal of C9 are carried out preliminary filtering; Magnetic bead L1, L2, L3, L4, L5 absorb impulse disturbances; R8, R9 and C5 and R5, R6 and C6 and C7 and R10 form the RC filter circuit mutually switching signal are carried out filtering, and C2, C4 play filter action equally.

Described filtering output module includes output interface (JP1), be used for optocoupler every after switching signal output and the pulse signal of transmission equipment output and 5V, 12V power supply; The power supply of electrochemical capacitor C1 and C3 carries out filtering.

A kind of isolator of the present invention has efficient isolation and filtering characteristic, and energy consumption is lower, and is with a wide range of applications.Particularly in some complex environments, can there be a large amount of interference in the space.If do not handle through isolation filter, interference signal will be responded to access arrangement from holding wire or power line, thereby influences the operate as normal of equipment, and this invention is a kind of filtering isolator, design filter circuit in first, absorbed the part interference signal that spatial impression should be come; Mid portion is designed to optical coupling isolation circuit and dc isolation circuit, external circuit and internal circuit is formed isolate, outside interference signal is isolated in.Dc isolation circuit is powered by device interior, can and be optocoupler and externally fed with inside and outside isolated from power; A back part is carried out filtering to reduce interference to the electric current of DC/DC converter input, with signal output, power supply is linked to each other with the device interior power supply at last.

Description of drawings

Fig. 1 is overall structure block diagram of the present invention;

Fig. 2 is working circuit diagram of the present invention;

Wherein:

1: the input filtration module

2: isolation module

3: the filtering output module

J1: signal input interface

JP1: output interface

Embodiment

Below in conjunction with embodiment and accompanying drawing a kind of filtering shielding system of the present invention is made a detailed description.

As shown in Figure 1, a kind of filtering shielding system of the present invention includes isolation module 1, it is characterized in that, also is provided with: input filtration module 2 is used for that filtering is carried out in the output of input signal and power supply and handles; Filtering output module 3, the power supply that is used for equipment is provided carries out filtering, and the signal after filtering is isolated is transmitted.

As shown in Figure 2, described input filtration module 1 includes signal input interface J1, is used for inserting external switch signal, output pulse signal and 5V, 12V; Capacitor C 8, the switching signal of C9 are carried out preliminary filtering; Magnetic bead L1, L2, L3, L4, L5 absorb impulse disturbances; R8, R9 and C5 and R5, R6 and C6 and C7 and R10 form the RC filter circuit mutually switching signal are carried out filtering, and C2, C4 play filter action equally.

As shown in Figure 2, described isolation module includes several light-coupled isolation interfaces, be used for isolation signals, wherein U1 and U2 are made up of by two the two-way optocoupler respectively, be same circuits, can be designed to some groups, they play the effect of isolating switch signal, and resistance R 1, R8 and R9 play metering function at this; U3 is one road optocoupler, is used for isolating pulse signal, and R3, R10 play metering function at this, and R4 is pull-up resistor intensifier pulse signal; U4 is that 5V changes the 5VDC/DC converter, is used for the 5V power supply that xegregating unit provides, and offers photoelectric coupled circuit and external equipment; U5 is that 12V changes the 12VDC/DC converter, is used for the 12V power supply that xegregating unit provides, and offers external equipment.

As shown in Figure 2, described filtering output module includes output interface, be used for optocoupler every after switching signal output and the pulse signal of transmission equipment output and 5V, 12V power supply; The power supply of electrochemical capacitor C1 and C3 carries out filtering.

A kind of isolator of the present invention has efficient isolation and filtering characteristic, and energy consumption is lower, and is with a wide range of applications.

Particularly in some complex environments, can there be a large amount of interference in the space.If do not handle through isolation filter, interference signal will be responded to access arrangement from holding wire or power line, thereby influences the operate as normal of equipment, and this invention is a kind of filtering isolator, design filter circuit in first, absorbed the part interference signal that spatial impression should be come; Mid portion is designed to optical coupling isolation circuit and dc isolation circuit, external circuit and internal circuit is formed isolate, outside interference signal is isolated in.Dc isolation circuit is powered by device interior, can and be optocoupler and externally fed with inside and outside isolated from power; A back part is carried out filtering to reduce interference to the electric current of DC/DC converter input, with signal output, power supply is linked to each other with the device interior power supply at last.

Claims

1. a filtering isolator includes isolation module (2), it is characterized in that, also is provided with: input filtration module (1) is used for that filtering is carried out in the output of input signal and power supply and handles; Filtering output module (3), the power supply that is used for equipment is provided carries out filtering, and the signal after filtering is isolated is transmitted.

2. a kind of filtering isolator according to claim 1, it is characterized in that, described isolation module (2) includes several light-coupled isolation interfaces, be used for isolation signals, wherein U1 and U2 are made up of by two the two-way optocoupler respectively, are same circuits, can be designed to some groups, they play the effect of isolating switch signal, and resistance R 1, R8 and R9 play metering function at this; U3 is one road optocoupler, is used for isolating pulse signal, and R3, R10 play metering function at this, and R4 is pull-up resistor intensifier pulse signal; U4 is that 5V changes the 5VDC/DC converter, is used for the 5V power supply that xegregating unit provides, and offers photoelectric coupled circuit and external equipment; U5 is that 12V changes the 12VDC/DC converter, is used for the 12V power supply that xegregating unit provides, and offers external equipment.

3. according to claim 1 or the described a kind of filtering isolator of claim 2, it is characterized in that described input filtration module (1) includes signal input interface (J1), be used for inserting external switch signal, output pulse signal and 5V, 12V; Capacitor C 8, the switching signal of C9 are carried out preliminary filtering; Magnetic bead L1, L2, L3, L4, L5 absorb impulse disturbances; R8, R9 and C5 and R5, R6 and C6 and C7 and R10 form the RC filter circuit mutually switching signal are carried out filtering, and C2, C4 play filter action equally.

4. according to claim 1 or the described a kind of filtering isolator of claim 2, it is characterized in that, described filtering output module (3) includes output interface (JP1), be used for optocoupler every after switching signal output and the pulse signal of transmission equipment output and 5V, 12V power supply; The power supply of electrochemical capacitor C1 and C3 carries out filtering.