CN204832824U

CN204832824U - Frequency isolated safety barrier

Info

Publication number: CN204832824U
Application number: CN201520491228.5U
Authority: CN
Inventors: 周虎; 孙玉峰
Original assignee: SUZHOU BEIJIAFU EXPLOSION-PROOF ELECTRICAL Co Ltd
Current assignee: The Suzhou times jia'an explosion-proof electricity limited company
Priority date: 2015-07-09
Filing date: 2015-07-09
Publication date: 2015-12-02
Anticipated expiration: 2025-07-09

Abstract

The utility model provides a frequency isolated safety barrier, includes power supply circuit, explosion -proof processing module, filter amplifier module, signal isolation module, drive reinforcing module, output circuit. Frequency isolated safety barrier, simple structure, low in production cost, temperature characteristic is good, the response is fast, the low -power consumption, keep apart effectually and the reliability is high.

Description

A kind of frequency isolation formula safety barrier

Technical field

The utility model relates to a kind of safety barrier, particularly a kind of frequency isolation formula safety barrier.

Background technology

Safety barrier also known as safety holder, the safe interface in intrinsic safety loop, it can between place of safety and explosive area bi-directional electric signal, and the place of safety caused because of fault can be limited pass on to the energy in explosive area.Be divided into two large classes by the full grid of structure: a class is Zener type safety barrier, its principle is simple, circuit realiration is easy, cheap, but be greatly affected because of the reliability in making it apply due to the defect of himself principle, and limit its range of application.Isolating safety grid have employed input, exports and the circuit structure of power supply mutual electrical isolation three party, meets the requirement of intrinsic safety type restriction energy simultaneously.With Zener type safely compared with, isolating safety grid has outstanding advantage and more extensive use, although its price is a little more than Zener type safety barrier, from design, construction and installation, debug and be maintained as original consideration, its integrated cost is on the contrary lower than Zener type safety barrier.Requiring that higher engineering site almost have employed isolating safety grid bar none as main intrinsic safe explosion-proof instrument, isolating safety grid instead of Zener type safety barrier gradually, obtains increasingly extensive application in safety anti-explosive field.

Safety barrier is widely used in the industrial instrument front end signal process in the field such as explosion-proof, for raising industrial processes automatic control system antijamming capability, Guarantee control system stability and reliability have very important effect, but current safety barrier has the following disadvantages: power consumption is large, poor stability, temperature characterisitic is poor, poor anti jamming capability, output shift is large, easily breaks down; In addition output power is little, and current-limiting resistance is comparatively large, and thermal value is many, and resistance temperature rise is too high; And small product size is comparatively large, is unfavorable for in-site installation.

Utility model content

Utility model object: the purpose of this utility model is to provide a kind of frequency isolation formula safety barrier, this frequency isolation formula safety barrier isolation effect is good, reliability is high, good temp characteristic, response are fast, low-power consumption, isolating safety grid that production cost is low.

Technical scheme: a kind of frequency isolation formula safety barrier, comprises power circuit, technological processing for explosion protection feature module, filter and amplification module, signal isolation module, drives enhancing module, output circuit; The output terminal of described power circuit connects the input end of technological processing for explosion protection feature module and signal isolation module respectively; The output terminal of described technological processing for explosion protection feature module connects the input end of filter and amplification module; The input end of the output terminal connection signal isolation module of described stream filter and amplification module; The output terminal of described signal isolation module connects the input end driving and strengthen module; The described output terminal strengthening module that drives connects output circuit.Frequency isolation formula safety barrier described in the utility model, structure is simple, and production cost is low.Frequency isolation formula safety barrier frequency input single channel frequency signal exports isolating safety grid function, by the frequency signal in explosive area, is converted to the frequency signal of 1:1 to place of safety, and provides power distribution to explosive area instrument through isolation.Frequency isolation formula safety barrier possesses stronger input signal processing power, can accept and process the signals such as thermopair, thermal resistance, frequency.In addition, the signal that the exportable two-way of frequency isolation formula safety barrier is mutually isolated, to be supplied to two equipment use using same signal source, and ensures that two device signal do not interfere with each other, improves connected device electrical safety insulating property each other simultaneously.And this design also will enter end, output terminal and power end three end to be separated, and meets the requirement of intrinsic safety type restriction energy, can connect logic level or three-wire system pulse signal, without the need to system earth circuit, brings great convenience to design and site operation simultaneously.Because signal line is without the need to common, the stability of detection and control loop signal and antijamming capability is strengthened greatly, thus improves the reliability of whole system.Corresponding fast, the low-power consumption of frequency isolation formula safety barrier described in the utility model, reduce the interference that transmission line is subject to noise simultaneously, improve isolation effect and improve the stability of device.

Above-mentioned frequency isolation formula safety barrier, described power circuit comprises power input part, transformer and power output part composition.Described power circuit exports constant voltage supply integrated circuit and modules by transformer is stable, and power supply can adjust flexibly according to budget.

Above-mentioned frequency isolation formula safety barrier, described signal isolation module adopts optical coupling isolator or magnetic coupling digital isolator.Optical coupling isolator or magnetic coupling digital isolator can be selected as required to signal isolation module.Wherein optical coupling isolator product category is various, low price.Its signal one-way transmission, input end and output terminal fully achieve electrical isolation isolates, and outputs signal on input end without impact, and antijamming capability is strong, contactless, long service life.And magnetic coupling digital isolator is low in energy consumption, digital isolator under low frequency condition a use photo-coupler power 1%; Under the highest transfer rate condition of photo-coupler, it uses about 20% of photo-coupler power, reduces power and it can be made to improve reliability.

Technique scheme can be found out, the utility model has following beneficial effect: frequency isolation formula safety barrier described in the utility model, and structure is simple, and production cost is low, and good temp characteristic, response are fast, low-power consumption, isolation effect is good and reliability is high.

Accompanying drawing explanation

Fig. 1 is the schematic block circuit diagram of frequency isolation formula safety barrier described in the utility model;

Fig. 2 is the theory diagram of the power circuit of frequency isolation formula safety barrier described in the utility model.

Embodiment

Below in conjunction with the drawings and specific embodiments, illustrate the utility model further.

Frequency isolation formula safety barrier as shown in Figure 1, comprises power circuit, technological processing for explosion protection feature module, filter and amplification module, signal isolation module, drives enhancing module, output circuit; The output terminal of described power circuit connects the input end of technological processing for explosion protection feature module and signal isolation module respectively; The output terminal of described technological processing for explosion protection feature module connects the input end of filter and amplification module; The input end of the output terminal connection signal isolation module of described stream filter and amplification module; The output terminal of described signal isolation module connects the input end driving and strengthen module; The described output terminal strengthening module that drives connects output circuit.

As shown in Figure 2, power circuit is that safety barrier is powered, be made up of power input part, transformer and power output part, described power output part comprises the output of 5V voltage, 3.3V voltage exports and other voltage exports, and exports constant voltage supply integrated circuit and modules.Signal isolation module can adopt optical coupling isolator or magnetic coupling digital isolator, and the present embodiment signal isolation module adopts ADUM7643 four-way magnetic coupling digital isolator, and its volume is little, and stability, real-time are good.

The above is only preferred implementation of the present utility model; it should be pointed out that for those skilled in the art, under the prerequisite not departing from the utility model principle; can also make some improvement, these improvement also should be considered as protection domain of the present utility model.

Claims

1. a frequency isolation formula safety barrier, is characterized in that: comprise power circuit, technological processing for explosion protection feature module, filter and amplification module, signal isolation module, drive enhancing module, output circuit; The output terminal of described power circuit connects the input end of technological processing for explosion protection feature module and signal isolation module respectively; The output terminal of described technological processing for explosion protection feature module connects the input end of filter and amplification module; The input end of the output terminal connection signal isolation module of described filter and amplification module; The output terminal of described signal isolation module connects the input end driving and strengthen module; The described output terminal strengthening module that drives connects output circuit.

2. frequency isolation formula safety barrier according to claim 1, is characterized in that: described power circuit comprises power input part, transformer and power output part composition.

3. frequency isolation formula safety barrier according to claim 1 and 2, is characterized in that: described signal isolation module adopts optical coupling isolator or magnetic coupling digital isolator.