CN203084479U

CN203084479U - Isolation safety barrier

Info

Publication number: CN203084479U
Application number: CN 201320021266
Authority: CN
Inventors: 李院院; 卢一鑫; 李莉
Original assignee: Xian University
Current assignee: Xian Unversity of Arts and Science; Xian University
Priority date: 2013-01-15
Filing date: 2013-01-15
Publication date: 2013-07-24
Anticipated expiration: 2023-01-15

Abstract

The utility model relates to an isolation safety barrier. The isolation safety barrier solves the problems that the existing safety barrier is susceptible to interference and runs away when in use, a program is difficultly erased and the like. The safety barrier comprises a power supply, an isolator, an energy limiter, ADC, a single chip microcomputer, an optocoupler isolation circuit, an output circuit, a receiver and a transmitter, wherein the receiver and the transmitter are matched with each other. The output end of the receiver is connected with the single chip microcomputer. The isolation safety barrier provided by the utility model has the advantages that the receiver and the transmitter are added; a command is issued by using an infrared transmission technology in an industrial field to modify parameters, so as to adapt to a new field environment; and the isolation safety barrier has high anti-interference ability and programming control ability, and can adapt to a variety of temperature measuring materials. The circuit can be applied to an intrinsically safe explosion-proof device in a hazardous place to jointly constitute an intrinsically safe explosion-proof system.

Description

A kind of isolating safety grid

Technical field

The utility model belongs to the safety barrier field, is specifically related to a kind of isolating safety grid.

Background technology

Existing safety barrier is subject in use disturb and runs and fly, and program is wiped difficulty, is merely able to adapt to a kind of temperature-measurement material; After the conversion environment, need the modify instruction parameter, or dispose new safety barrier, applicable surface is narrow.

Summary of the invention

The utility model is subject in use disturb at safety barrier in the background technology and runs and fly, and program such as is difficult to wipe at problem, has designed a kind of isolating safety grid with high anti-jamming capacity.

Technical solution of the present utility model is:

A kind of isolating safety grid, its special character is: comprise power supply, isolator, limit energy device, ADC, single-chip microcomputer, optical coupling isolation circuit, output circuit;

Power supply is by giving limit energy device, ADC, single-chip microcomputer, optical coupling isolation circuit, output circuit power supply behind the isolator, the output terminal of the external DCS of the input end system of limit energy device, the output terminal of limit energy device is connected with ADC, ADC and single-chip microcomputer are connected to each other, and the output terminal of single-chip microcomputer is connected with output circuit by optical coupling isolation circuit.

Above-mentioned isolating safety grid also comprises receiver and the transmitter that matches each other, and the output terminal of described receiver is connected with single-chip microcomputer.

Above-mentioned optical coupling isolation circuit comprises at least three tunnel light-coupled isolation unit, described light-coupled isolation unit comprises optical coupling isolator, the optical coupling isolator anode connects power supply, the optical coupling isolator negative electrode is connected with the signal output part of single-chip microcomputer by first resistance, the optical coupling isolator collector connects power supply by second resistance, the optical coupling isolator collector is simultaneously as the input end of not gate, the optical coupling isolator grounded emitter, and the output terminal of not gate is connected with output circuit.

The number of above-mentioned light-coupled isolation unit is smaller or equal to the figure place of analog-digital chip in the output circuit.

Above-mentioned optical coupling isolator adopts PC817.

Above-mentioned single-chip microcomputer is 51 series or 430 Series chip.

Above-mentioned transmitter is an infrared transmitter.

Above-mentioned transmitter adopts the transmitter of PIC series, WD series or SAA series.

Advantage of the present utility model is:

(1) sets up transmitter and receiver, adopt the technology of infrared transmission issuing command to revise parameter in industry spot, to adapt to new site environment.

(2) have very high antijamming capability, the programming Control ability, and can adapt to multiple temperature-measurement material.

(3) this circuit intrinsic safety type antiknock device of can be used for the hazardous area is with common formation Sefe antiexplosion system.

Description of drawings

Fig. 1 is a circuit block diagram of the present utility model;

Fig. 2 is particular circuit configurations figure of the present utility model.

Embodiment

A kind of isolating safety grid comprises power supply, isolator, limit energy device, ADC, single-chip microcomputer, optical coupling isolation circuit, output circuit, the receiver that matches each other and transmitter;

Power supply is by giving limit energy device, ADC, single-chip microcomputer, optical coupling isolation circuit, output circuit power supply behind the isolator, the output terminal of the external DCS of the input end system of limit energy device, the output terminal of limit energy device is connected with ADC, ADC and single-chip microcomputer are connected to each other, the output terminal of single-chip microcomputer is connected with output circuit by optical coupling isolation circuit, the output terminal of receiver is connected with single-chip microcomputer, and output signal is 1-5V voltage or 4-20mA electric current.

Limit can be used for the limit interferences pulse by device, suppresses to disturb.

Optical coupling isolation circuit comprises at least three tunnel light-coupled isolation unit, described light-coupled isolation unit comprises optical coupling isolator, the model of optical coupling isolator is PC817, the optical coupling isolator anode connects power supply, the optical coupling isolator negative electrode is connected with the signal output part of single-chip microcomputer by first resistance, the collector of optical coupling isolator connects power supply by second resistance, the collector while of optical coupling isolator is as the input end of not gate, the optical coupling isolator grounded emitter, as the input end of not gate, the output terminal of not gate is connected with output circuit the collector of each light-coupled isolation unit, road simultaneously.The number of light-coupled isolation unit is smaller or equal to the figure place of analog-digital chip in the output circuit.

The preferred infrared transmitter of transmitter, infrared transmitter be mainly by emission single-chip microcomputer, driving tube Q01 and Q02, formations such as infrared transmitting tube D01, and for example, the emission single-chip microcomputer is selected the chip of PIC series, WD series or SAA series for use, for example PIC18P248 etc.

Receiver mainly adopts the special-purpose infrared receiving module HS0038 of Vishay company.

Single-chip microcomputer is 51 series or 430 Series chip, for example, and AT89S52.

Principle of work: the DCS system produces the current signal of 4-20mA, behind limit energy device disturbing pulse, carry out digital-to-analog conversion by ADC, data after the conversion are read by single-chip microcomputer and handle, and to the relevant steering order of ADC transmission, data after single-chip microcomputer is handled are isolated via optical coupling isolation circuit and output circuit, and output circuit is finally exported the signal of 1-5V or 4-20mA.When external environment changes, can send by transmitter and revise signal, send to single-chip microcomputer after receiving by receiver, revise correlation parameter in the single-chip microcomputer.

The utlity model has very high antijamming capability, the programming Control ability, and can adapt to multiple temperature-measurement material.

Set up transmitter and receiver, can adopt the technology of infrared transmission issuing command to revise parameter in industry spot, to adapt to new site environment.The intrinsic safety type antiknock device that this circuit can be used for the hazardous area is with common formation Sefe antiexplosion system.

Claims

1. an isolating safety grid is characterized in that: comprise power supply, isolator, limit energy device, ADC, single-chip microcomputer, optical coupling isolation circuit, output circuit;

2. isolating safety grid according to claim 1 is characterized in that: described isolating safety grid also comprises receiver and the transmitter that matches each other, and the output terminal of described receiver is connected with single-chip microcomputer.

3. isolating safety grid according to claim 1 and 2, it is characterized in that: described optical coupling isolation circuit comprises at least three tunnel light-coupled isolation unit, described light-coupled isolation unit comprises optical coupling isolator, the optical coupling isolator anode connects power supply, the optical coupling isolator negative electrode is connected with the signal output part of single-chip microcomputer by first resistance, the optical coupling isolator collector connects power supply by second resistance, the optical coupling isolator collector while is as the input end of not gate, the optical coupling isolator grounded emitter, the output terminal of not gate is connected with output circuit.

4. isolating safety grid according to claim 3 is characterized in that: the number of described light-coupled isolation unit is smaller or equal to the figure place of analog-digital chip in the output circuit.

5. isolating safety grid according to claim 4 is characterized in that: described optical coupling isolator adopts PC817.

6. isolating safety grid according to claim 5 is characterized in that: described single-chip microcomputer is 51 series or 430 Series chip.

7. isolating safety grid according to claim 2 is characterized in that: described transmitter is an infrared transmitter.

8. isolating safety grid according to claim 7 is characterized in that: described transmitter adopts the transmitter of PIC series, WD series or SAA series.