CN103927020A - Intrinsically-safe-type keyboard circuit used for electronic equipment in flammable and explosive places - Google Patents
Intrinsically-safe-type keyboard circuit used for electronic equipment in flammable and explosive places Download PDFInfo
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- CN103927020A CN103927020A CN201310740107.5A CN201310740107A CN103927020A CN 103927020 A CN103927020 A CN 103927020A CN 201310740107 A CN201310740107 A CN 201310740107A CN 103927020 A CN103927020 A CN 103927020A
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Abstract
The invention relates to an intrinsically-safe-type keyboard circuit used for electronic equipment in flammable and explosive places. Intrinsically-safe anti-explosion effect of a keyboard of the electronic equipment in the flammable and explosive places is realized by adopting data infrared isolation technology, power source magnetic isolation technology and safety barrier technology and through combined action of an infrared coding circuit, an infrared decoding circuit, an isolating power source and a safety barrier. The intrinsically-safe-type keyboard circuit is mainly composed of the isolating power source, the safety barrier, a keyboard array, the coding circuit, an infrared emitting circuit, an infrared receiving circuit, the decoding circuit and an electronic switch circuit. The intrinsically-safe-type keyboard circuit has the advantages of high reliability, stable performance, low processing and manufacturing cost and the like, and the intrinsically-safe problem, in input and output, of the electronic equipment in the flammable and explosive places can be solved fundamentally.
Description
Technical field
The invention belongs to safety in production support equipment field.Be particularly related to the electronic device design with man-machine interaction keyboard in inflammable and explosive place.
Background technology
Along with social progress, the development of science and technology, the electronic equipment that is applied to the hazardous area such as inflammable and explosive is more and more, the intelligent level of these equipment is also more and more higher, therefore need to manipulate these electronic equipments by keyboard in explosive area under many circumstances, due to the particular/special requirement of working environment, if keyboard circuit design is improper, make to nonserviceable strike sparks down, overheated situation, will cause potential dangerous hidden danger.
Therefore, the above problem existing for the electronic equipment of the hazardous area such as inflammable and explosive, a kind of safety of exploitation, reliably, keyboard input-output unit easily, have important practical significance.
Summary of the invention
The object of the invention is the weak point for overcoming prior art, propose a kind of circuit design of the electronic equipment keyboard that is applied to the hazardous area such as inflammable and explosive.The keyboard of applying this circuit can directly use in hazardous location, avoids increasing at flame proof bulkhead in order to use keyboard the labyrinth of keyboard guide rod, and has alleviated weight and design difficulty.
The present invention proposes a kind of keyboard circuit design of the electronic equipment that is applied to the hazardous area such as inflammable and explosive, it is characterized in that, this main circuit will be made up of insulating power supply, safety barrier, push-button array, coding circuit, infrared transmitting circuit, infrared receiving circuit, decoding circuit, electronic switching circuit; Wherein, the secondary side of push-button array, coding circuit, infrared transmitting circuit, insulating power supply and corresponding safety barrier are as intrinsically safe circuit part, and remainder is as non-intrinsically safe circuit.The secondary side of insulating power supply is connected with push-button array, coding circuit, infrared transmitting circuit through corresponding isolated gate; System power supply is connected with the primary side of insulating power supply through corresponding isolated gate; The output of push-button array is connected with coding circuit; The output of coding circuit is connected with infrared transmitting circuit; The infrared circuit of accepting receives the infrared light that radiating circuit sends, and its output is connected with decoding circuit; The output of decoding circuit is connected with electronic switch controling end; The output of electronic switch is connected with the application circuit of system.
Insulating power supply of the present invention is for generation of the safe voltage of isolation, for intrinsic safety terminal circuit.
Safety barrier of the present invention, for when the faults such as system is short-circuited, releasing energy of restriction intrinsically safe circuit, ensures system nature's safety.
Keyboard array of the present invention is the mutual input equipment of people and electronic equipment.
Coding circuit of the present invention, is compiled into digital signal by the input of keyboard according to certain rule, and is modulated on carrier wave.
Infrared transmitting circuit of the present invention, launches the digital signal of modulation by infrared mode.
Infrared receiving circuit of the present invention, carries out filtering, amplification, demodulation by the infrared signal receiving, and recovers raw data;
Decoding circuit of the present invention, is translated as corresponding keyboard action by digital signal, and controls corresponding electronic switch Enable Pin;
Electronic switch of the present invention receives enable signal, thereby controls the break-make of corresponding electronic switch, thereby controls corresponding practical application circuit.
The present invention has following characteristics and beneficial effect:
Circuit of the present invention is applicable to the electronic device design with input keyboard in inflammable and explosive place, on power supply, adopt the technology of magnetic isolation, in data transmission, adopt the technology of infrared isolation, and combine safety barrier technology, make that this circuit form is simple, fast response time, safe reliability be high, applied widely, on this basis, can make that field apparatus volume reduces, weight saving, and bring convenience to the structural design of complete machine.This circuit extensibility is strong, if change a little, as changed the power supply of intrinsic safety end into external intrinsic safety electric source, can become the closely circuit arrangement of infrared remote control intrinsic safety keyboard.
Brief description of the drawings
Fig. 1 is intrinsic safety type keyboard circuit schematic diagram of the present invention.
Embodiment
The keyboard circuit design that the present invention proposes, is applicable to the manufacture of inflammable and explosive hazardous area electronic equipment, can improve the security of product and reduce costs, by reference to the accompanying drawings 1 and embodiment be described in detail as follows:
As shown in Figure 1, this main circuit will be made up of insulating power supply 1, safety barrier 2, push-button array 3, coding circuit 4, infrared transmitting circuit 5, infrared receiving circuit 6, decoding circuit 7, electronic switch 8 keyboard circuit of the present invention; Wherein, the secondary side of insulating power supply 1, the safety barrier of secondary side 2, push-button array 3, coding circuit 4, infrared transmitting circuit 5 have formed intrinsically safe circuit jointly, are conventionally placed on explosive area, for on-the-spot handheld device, may be exactly to be placed on flame proof out of my cabin; The circuit of the primary side 1 of insulating power supply, the safety barrier 2 of primary side, infrared receiving circuit 6, decoding circuit 7, electronic switch 8 these several parts is placed on place of safety conventionally, for on-the-spot handheld device, may be exactly to be placed in flame proof cabin.The primary side of insulating power supply 1, by the Power supply in place of safety, produces isolation voltage at secondary side, is suitable for for intrinsically safe circuit.The output of push-button array 3 is connected with the input of coding circuit 4, and the input of infrared transmitting circuit 5 is connected with the output of coding circuit 4; Infrared receiving circuit 6 is by infrared communication with infrared transmitting circuit 5; The input of decoding circuit 7 is connected with the output of infrared receiving circuit 6; The input of electronic switch 8 is connected with the output of decoding circuit 7.
Function and the embodiment of each parts of the present invention are respectively described below:
Insulating power supply 1 of the present invention, adopts magnetic isolation method, is driven by the voltage of primary side, produces the secondary side voltage for intrinsically safe circuit.This power supply can adopt transformer or isolating chip, as Adum5000 chip.
Safety barrier 2 of the present invention is divided into two parts, and a part is positioned at insulating power supply primary side, and a part is positioned at insulating power supply secondary side.Its basic role is by Limited Current and voltage, makes at unusual condition, and under the state of short circuit, the energy that intrinsically safe circuit part discharges is in safe controlled range.Safety barrier can adopt one or several connection in series-parallel in the elements such as fuse, resistance, transient voltage twin zener dioder, stabilivolt to use.A kind of typical application scheme is that the safety barrier of primary side adopts at a fuse of power end serial connection; The safety barrier of secondary side adopts at power end serial connection current-limiting resistance and and connects transient voltage twin zener dioder.
Push-button array 3 of the present invention is the mutual equipment of field apparatus and people, can adopt conventional button, as touch key, film key etc.
Coding circuit 4 of the present invention carries out numerical coding to the input of push-button array, and is modulated on carrier wave.This partial circuit is selected the chip of supply voltage low (being no more than 5V), working current little (being only several mA) conventionally, thereby meets requirement the extension device stand-by time of intrinsically safe circuit.Can select integrated infrared coding chip, as TC9148 or PT2262 etc.
Infrared transmitting circuit 5 of the present invention is gone out the numeral after coding by infrared light emission.A kind of attainable scheme is the combination that adopts triode, resistance, infraluminescence pipe.
The infrared signal receiving is carried out filtering, amplification, demodulation by infrared receiving circuit 6 of the present invention, recovers raw data.Can adopt integrated infrared receiving tube, as HS0038B.
Digital signal is translated as corresponding keyboard action by decoding circuit 7 of the present invention, and control corresponding electronic switch Enable Pin.The circuit of this part can adopt CPU, also can be with integrated chip as TC9150 etc.
Electronic switching circuit 8 of the present invention receives after enable signal, corresponding certain way switch of break-make, thus realize Keyboard Control application circuit.This partial circuit can adopt relay, also can adopt integrated bidirectional analog switch chip, as CD4066 etc.
Principle of work of the present invention is: keyboard array 3 is in the time being pressed certain key, and coding circuit 4 detects that keyboard changes, and this variation is carried out to digitizing, and is modulated on the carrier wave of certain frequency, launches by infrared transmitting circuit 5; Infrared receiving circuit 6 receives after signal, amplification after filtering,, demodulation, digitized signal is sent in decoding circuit 7, decoding circuit 7 is translated the data of receiving, thereby determine it is the action of which button, and drive the Enable Pin of the corresponding Yi of this button road electronic switch, electronic switch 8 is being received after the signal that drives a certain way switch Enable Pin, control the break-make of this road electronic switch, thereby realized the control of keyboard array 3 to application circuit.Power acquisition insulating power supply 1, and primary side and secondary side at insulating power supply 1 have all increased safety barrier 2, if therefore in the time of the faults such as equipment is short-circuited, voltage, the electric current that can guarantee intrinsically safe circuit part can not exceed the limit value of requirement of explosion proof, thereby have ensured the safety of intrinsically safe circuit part.And the data transmission of this keyboard has adopted the mode of infrared isolation, isolate physically the impact between intrinsically safe circuit and non-intrinsically safe circuit, guarantee the safety of intrinsically safe circuit.
Claims (2)
1. one kind is applied to the intrinsically safe circuit design of the keyboard of inflammable and explosive hazardous area electronic equipment, it is characterized in that, this main circuit will be made up of insulating power supply, safety barrier, push-button array, coding circuit, infrared transmitting circuit, infrared receiving circuit, decoding circuit, electronic switching circuit; Wherein, the secondary side of push-button array, coding circuit, infrared transmitting circuit, insulating power supply and corresponding safety barrier are as intrinsically safe circuit part, and remainder is as non-intrinsically safe circuit.The secondary side of insulating power supply is connected with push-button array, coding circuit, infrared transmitting circuit through corresponding isolated gate; System power supply is connected with the primary side of insulating power supply through corresponding isolated gate; The output of push-button array is connected with coding circuit; The output of coding circuit is connected with infrared transmitting circuit; Infrared receiving circuit receives the infrared light that radiating circuit sends, and its output is connected with decoding circuit; The output of decoding circuit is connected with electronic switch controling end; The output of electronic switch is connected with the application circuit of system.
2. intrinsic safety keyboard circuit as claimed in claim 1, is characterized in that, in data transmission, has adopted Data Infrared isolation technology, the operation of keyboard is converted into the operation to electronic switch; Aspect power supply, adopt the technology of power supply magnetic isolation+safety barrier.These technology common guarantee the anti-explosion safety performance of intrinsically safe circuit part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310740107.5A CN103927020B (en) | 2013-12-30 | 2013-12-30 | A kind of intrinsic safety type keyboard circuit for combustible and explosive area electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310740107.5A CN103927020B (en) | 2013-12-30 | 2013-12-30 | A kind of intrinsic safety type keyboard circuit for combustible and explosive area electronic equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103927020A true CN103927020A (en) | 2014-07-16 |
| CN103927020B CN103927020B (en) | 2018-04-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310740107.5A Active CN103927020B (en) | 2013-12-30 | 2013-12-30 | A kind of intrinsic safety type keyboard circuit for combustible and explosive area electronic equipment |
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| CN (1) | CN103927020B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106300634A (en) * | 2016-08-17 | 2017-01-04 | 华康泰克信息技术（北京）有限公司 | A kind of novel uninterrupted power source isolated gate device |
| CN106851048A (en) * | 2017-01-10 | 2017-06-13 | 北京中安科创科技发展有限公司 | A kind of analog video signal isolation circuit of explosive atmosphere electrical installation |
| CN110908521A (en) * | 2019-10-23 | 2020-03-24 | 连云港杰瑞自动化有限公司 | Intrinsically safe keyboard circuit for batch controller in explosion-proof occasion |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101820226A (en) * | 2010-04-30 | 2010-09-01 | 常州联力自动化科技有限公司 | Flameproof and intrinsically safe power supply with human-computer interaction function |
| CN203217300U (en) * | 2013-03-05 | 2013-09-25 | 青岛天信电气有限公司 | Mining intrinsic safety remote control device |
| CN103411883A (en) * | 2013-08-23 | 2013-11-27 | 四川省川煤科技有限公司 | Methane detection warning instrument |
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2013
- 2013-12-30 CN CN201310740107.5A patent/CN103927020B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101820226A (en) * | 2010-04-30 | 2010-09-01 | 常州联力自动化科技有限公司 | Flameproof and intrinsically safe power supply with human-computer interaction function |
| CN203217300U (en) * | 2013-03-05 | 2013-09-25 | 青岛天信电气有限公司 | Mining intrinsic safety remote control device |
| CN103411883A (en) * | 2013-08-23 | 2013-11-27 | 四川省川煤科技有限公司 | Methane detection warning instrument |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106300634A (en) * | 2016-08-17 | 2017-01-04 | 华康泰克信息技术（北京）有限公司 | A kind of novel uninterrupted power source isolated gate device |
| CN106851048A (en) * | 2017-01-10 | 2017-06-13 | 北京中安科创科技发展有限公司 | A kind of analog video signal isolation circuit of explosive atmosphere electrical installation |
| CN106851048B (en) * | 2017-01-10 | 2023-07-21 | 北京中安科创科技发展有限公司 | Analog video signal isolation circuit of electrical equipment for explosive environment |
| CN110908521A (en) * | 2019-10-23 | 2020-03-24 | 连云港杰瑞自动化有限公司 | Intrinsically safe keyboard circuit for batch controller in explosion-proof occasion |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103927020B (en) | 2018-04-03 |
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