CN104866449A - Intrinsic safety type USB (universal serial bus) interface circuit for electronic devices in flammable and combustible places - Google Patents
Intrinsic safety type USB (universal serial bus) interface circuit for electronic devices in flammable and combustible places Download PDFInfo
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- CN104866449A CN104866449A CN201410064537.4A CN201410064537A CN104866449A CN 104866449 A CN104866449 A CN 104866449A CN 201410064537 A CN201410064537 A CN 201410064537A CN 104866449 A CN104866449 A CN 104866449A
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Abstract
The invention relates to an intrinsic safety type USB (universal serial bus) interface circuit design applied to electronic devices in flammable and combustible places. The design adopts the techniques of power supply magnetic isolation, signal magnetic isolation and guard grating, and the intrinsic-safety anti-explosive effect of USB interfaces of the electronic devices in the flammable and combustible places is realized under the combined action of a voltage-boosting module, a power supply isolation module, a signal isolation chip, a transient suppression diode and the guard grating. The design mainly comprises the voltage-boosting module, an isolating power supply, the signal isolation chip, the guard grating, a common mode inductor and the transient suppression diode. The design has the advantages of high reliability and stable performance, and accordingly, the intrinsic safety problem of signal interface communication of the electric devices in the flammable and combustible places can be solved fundamentally.
Description
Technical field
The invention belongs to safety in production support equipment field.In particular to the electronic device design with equipment room interactive interface of combustible and explosive area.
Background technology
Along with the progress of society, the development of science and technology, the electronic equipment being applied to the hazardous area such as inflammable and explosive gets more and more, the intelligent level of these equipment is also more and more higher, therefore the communication being carried out data in explosive area by interface is needed under many circumstances, due to the particular/special requirement of working environment, if Design of Communication Interface is improper, make to nonserviceable to strike sparks down, the situation such as overheated, potential dangerous hidden danger will be caused.
Therefore, the above problem that the electronic equipment for the hazardous area such as inflammable and explosive exists, a kind of safety of exploitation, reliably, data communication interface device easily, have important practical significance.
Summary of the invention
USB interface has become the de facto standard that digital product communicates with PC at present.The object of the invention is the weak point for overcoming prior art, proposing a kind of usb circuit design being applied to the hazardous area such as inflammable and explosive.The USB interface applying this circuit directly can use in hazardous location, avoid the labyrinth in order to use interface communication to increase interface hatch door at flame proof bulkhead, and alleviate weight of equipment and design difficulty, the design original intention of this interface with intrinsic safety interface for target design.
The present invention proposes a kind of usb circuit design being applied to the electronic equipment of the hazardous area such as inflammable and explosive, it is characterized in that, this circuit forms primarily of boost module, insulating power supply chip, signal isolating chip, safety barrier, common mode inductance and Transient Suppression Diode; Wherein, a side of power supply chip, signal isolating chip, corresponding safety barrier, boost module, corresponding Transient Suppression Diode and corresponding common mode inductance are as circuit part I, and all the other are as circuit part II.The power supply of integrated circuit reaches circuit part II by circuit part I, and signal then carries out two-way difference transmission between circuit part I and circuit part II.Power supply is being introduced into boost module after corresponding safety barrier, then enters the primary side of insulating power supply and the primary side of isolating chip, powers to the primary side of the primary side of power isolation module and signal isolating chip; One road signal of differential data signals through corresponding safety barrier, then through common mode inductance, the primary side of arriving signal isolating chip under the monitoring being subject to Transient Suppression Diode simultaneously; The secondary side of insulating power supply is connected with the secondary side of isolation signals chip; The isolation signals of isolation signals chip secondary side is connected with miscellaneous equipment circuit through common mode inductance and safety barrier under the monitoring of Transient Suppression Diode; Another road signal of differential data signals then anti-phase from isolation signals end through the corresponding safety barrier of secondary side of signal isolating chip, Transient Suppression Diode, common mode inductance to the data-signal of circuit part I, form complete differential signal communication.
The normal use of USB interface in inflammable and explosive hazardous area of these technology common guarantee, and the anti-explosion safety performance of intrinsically safe circuit.
Boost module of the present invention is for maintaining the USB supply voltage of feeder ear.
Insulating power supply of the present invention is for generation of the safe voltage of isolation.
Safety barrier of the present invention, for when faults such as system are short-circuited, releasing energy of limiting circuit, ensures system nature's safety.
Common mode inductance of the present invention is the common-mode noise in order to eliminate in USB difference mode signal.
Transient Suppression Diode of the present invention is mainly used in carrying out quick overvoltage protection to circuit component.
The present invention has following characteristics and beneficial effect:
Circuit of the present invention is applicable to the electronic device design with USB interface communication of combustible and explosive area; power supply transmits with data the technology that all have employed Magnetic isolation; and combine safety barrier technology, boosting voltage stabilizing technique and transient voltage protection; make that this circuit form is simple, fast response time, safe reliability are high; on this basis; the reduction of field apparatus volume, weight saving can be made, and bring convenience to the structural design of complete machine.This circuit volume is little, portable strong, can be used as the general scheme of the electronic device design under the explosive site surrounding of combustion with USB interface communication.
Accompanying drawing explanation
Fig. 1 is intrinsic safety type keyboard circuit schematic diagram of the present invention.
Embodiment
The present invention propose usb circuit design, be applicable to the manufacture of inflammable and explosive hazardous area electronic equipment, can improve the security of product, practicality and reduce weight, by reference to the accompanying drawings 1 and embodiment be described in detail as follows:
As shown in Figure 1, this circuit forms primarily of power isolation module 3, signal isolating chip 5, safety barrier 1, boost module 2, common mode inductance 4, Transient Suppression Diode 6 usb circuit of the present invention; Wherein, the primary side of insulating power supply 3, the primary side of signal isolating chip 6 and corresponding safety barrier 1, boost module 2, common mode inductance 4, Transient Suppression Diode 6 constitute circuit part I jointly; The secondary side of insulating power supply 3, the secondary side of signal isolating chip 6 and corresponding common mode inductance 4, Transient Suppression Diode 6, safety barrier 1 constitute circuit I I jointly.Circuit part I can according to the master-slave communication situation (feeder ear is different) of reality with circuit part II, be placed on explosive area and place of safety respectively, for on-the-spot handheld device etc. from equipment, circuit part I just can be placed on place of safety, as flame proof out of my cabin, circuit part II just can be placed on non-security district, as in flame proof cabin; For the main equipment at scene, circuit part I just can be placed on non-security district, and as in flame proof cabin, circuit part II just can be placed on place of safety, as flame proof out of my cabin.Power supply is entering boost module 2 after corresponding isolation safe grid 1, then enters the primary side of insulating power supply 3 and the primary side of signal isolating chip 5, powers to the primary side of the primary side of power isolation module 3 and signal isolating chip 5; The secondary side of insulating power supply 3 is connected with the secondary side of signal isolating chip 5; The secondary side of insulating power supply 3 gives isolation power supply through corresponding safety barrier 1; Differential data signals then passes through corresponding safety barrier 1, pass through corresponding common mode inductance 4 again, be subject to the protection of Transient Suppression Diode 6 simultaneously, then by signal isolating chip 5, again with corresponding common mode inductance 4, be subject to the protection of Transient Suppression Diode 6 simultaneously, eventually pass corresponding safety barrier 1, composition USB differential signal;
Function and the embodiment of each parts of the present invention are respectively described below:
Safety barrier 1 of the present invention.Its basic role is by Limited Current and voltage, makes at unusual condition, and as 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 suppressor, stabilivolt to use.A kind of typical apply scheme is, the safety barrier of primary side adopts and is connected in series a fuse at power end, then is connected in series one or more current-limiting resistance and and connects one or more Zener diode.
Boost module 2 of the present invention, is mainly used in maintaining the USB supply voltage of feeder ear, make power supply and Signal transmissions more stable.
Insulating power supply 3 of the present invention, adopts Magnetic isolation mode, powers to signal isolating chip 5.This power supply can adopt transformer or isolating chip, as Adum5000 chip.
Common mode inductance 4 of the present invention is the common-mode noises in order to eliminate in USB difference mode signal, as ACM3225 chip.
Signal isolating chip 5 of the present invention, adopts Magnetic isolation mode, powers to respectively signal isolating chip two ends by insulating power supply 3.USB differential data signals is isolated through signal isolating chip 5.This isolation signals chip can adopt signal isolating chip, as Adum4160 chip.
Transient Suppression Diode 6 of the present invention, is mainly used in carrying out quick overvoltage protection to circuit component.It can the surging signal of " absorption " power up to thousands of watts.Transient Suppression Diode has the plurality of advantages such as volume is little, power large, response is fast, noiseless.
Principle of work of the present invention is: communication power supply have employed insulating power supply 3, and both increase safety barrier 1 at the primary side of insulating power supply 3 and secondary side, if therefore when faults such as equipment are short-circuited, can guarantee that the voltage of intrinsically safe circuit power unit, electric current can not exceed the limit value of requirement of explosion proof; Boost module 2, ensures that USB powers stable; Signal have employed signal isolating chip 5, and both increase safety barrier 1, Transient Suppression Diode 6 and common mode inductance 4 at a side of signal isolating chip 5 and secondary side, ensure that the quality of differential signal, and electric current and voltage is all within requirement of explosion proof, thus ensure that the safety of intrinsically safe circuit part.
Claims (2)
1. one kind is applied to the intrinsically safe circuit design of the USB interface of inflammable and explosive hazardous area electronic equipment, it is characterized in that, this circuit forms primarily of boost module, insulating power supply chip, signal isolating chip, safety barrier, common mode inductance and Transient Suppression Diode; Wherein, a side of power isolation module, a side of signal isolating chip, corresponding safety barrier, boost module, corresponding Transient Suppression Diode and corresponding common mode inductance are as circuit part I, and the secondary side of power isolation module, the secondary side of signal isolating chip, corresponding safety barrier, corresponding Transient Suppression Diode and corresponding common mode inductance are as circuit part II.
Power supply is being introduced into boost module after corresponding safety barrier, then enters the primary side of insulating power supply and the primary side of isolating chip, powers to the primary side of the primary side of power isolation module and signal isolating chip; One road signal of differential data signals through corresponding safety barrier, then through common mode inductance, the primary side of arriving signal isolating chip under the monitoring being subject to Transient Suppression Diode simultaneously; The secondary side of insulating power supply is connected with the secondary side of isolation signals chip; The isolation signals of isolation signals chip secondary side is connected with miscellaneous equipment circuit through common mode inductance and safety barrier under the monitoring of Transient Suppression Diode; Another road signal of differential data signals then anti-phase from isolation signals end through the corresponding safety barrier of secondary side of signal isolating chip, Transient Suppression Diode, common mode inductance to the data-signal of circuit part I, form complete differential signal communication.
2. usb circuit as claimed in claim 1, it is characterized in that, the power supply of integrated circuit is by circuit part I to circuit part II, and signal then carries out two-way difference transmission between circuit part I and circuit part II.Circuit part I can be different according to the environment of master-slave communication with circuit part II, are selectively placed on place of safety and non-security district.The normal use of USB interface in inflammable and explosive hazardous area of these technology common guarantee, and the security performance that intrinsically safe circuit part is explosion-proof.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410064537.4A CN104866449B (en) | 2014-02-25 | 2014-02-25 | A kind of intrinsic safety type usb circuit for combustible and explosive area electronic equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410064537.4A CN104866449B (en) | 2014-02-25 | 2014-02-25 | A kind of intrinsic safety type usb circuit for combustible and explosive area electronic equipment |
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| CN104866449A true CN104866449A (en) | 2015-08-26 |
| CN104866449B CN104866449B (en) | 2018-10-12 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105955401A (en) * | 2016-04-22 | 2016-09-21 | 陕西太合科技有限公司 | Mining flame-proof and intrinsic safe type computer |
| 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 |
| CN112557725A (en) * | 2020-12-04 | 2021-03-26 | 上海航天控制技术研究所 | Simple isolation voltage detection circuit |
| GB2613191A (en) * | 2021-11-26 | 2023-05-31 | Cmr Surgical Ltd | An isolator module for use in a surgical robotic system |
| CN116780461A (en) * | 2022-09-28 | 2023-09-19 | 荣耀终端有限公司 | USB interface protection circuit and terminal equipment |
| CN117110706A (en) * | 2023-10-25 | 2023-11-24 | 青岛鼎信通讯股份有限公司 | Direct-current electric energy metering device and method |
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| CN203966114U (en) * | 2014-02-25 | 2014-11-26 | 北京中安科创科技发展有限公司 | A kind of intrinsic safety type usb circuit for inflammable and explosive place electronic equipment |
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| US6956382B2 (en) * | 2002-11-22 | 2005-10-18 | Saab Rosemount Tank Radar Ab | Isolation circuit |
| CN200962178Y (en) * | 2006-08-23 | 2007-10-17 | 郑州永邦电气有限公司 | Explosion prevention pan/tilt lens controller |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105955401A (en) * | 2016-04-22 | 2016-09-21 | 陕西太合科技有限公司 | Mining flame-proof and intrinsic safe type computer |
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| 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 |
| CN112557725A (en) * | 2020-12-04 | 2021-03-26 | 上海航天控制技术研究所 | Simple isolation voltage detection circuit |
| GB2613191A (en) * | 2021-11-26 | 2023-05-31 | Cmr Surgical Ltd | An isolator module for use in a surgical robotic system |
| CN116780461A (en) * | 2022-09-28 | 2023-09-19 | 荣耀终端有限公司 | USB interface protection circuit and terminal equipment |
| CN116780461B (en) * | 2022-09-28 | 2024-05-28 | 荣耀终端有限公司 | USB interface protection circuit and terminal equipment |
| CN117110706A (en) * | 2023-10-25 | 2023-11-24 | 青岛鼎信通讯股份有限公司 | Direct-current electric energy metering device and method |
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