CN105356439A - Protective circuit for external CAN (Controller Area Network) communication of airborne aerospace equipment - Google Patents
Protective circuit for external CAN (Controller Area Network) communication of airborne aerospace equipment Download PDFInfo
- Publication number
- CN105356439A CN105356439A CN201510871359.0A CN201510871359A CN105356439A CN 105356439 A CN105356439 A CN 105356439A CN 201510871359 A CN201510871359 A CN 201510871359A CN 105356439 A CN105356439 A CN 105356439A
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- China
- Prior art keywords
- diode
- communication
- data line
- tvs pipe
- protective circuit
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/042—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage comprising means to limit the absorbed power or indicate damaged over-voltage protection device
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- Emergency Protection Circuit Devices (AREA)
Abstract
The invention relates to a protective circuit for external CAN (Controller Area Network) communication of airborne aerospace equipment. The protective circuit comprises a first diode, a second diode, a third diode, a fourth diode, a first TVS (Transient Voltage Suppressor) tube and a second TVS tube, wherein the cathode of the first diode is connected with a CAN communication high-order data line, the cathode of the second diode is connected with a CAN communication low-order data line, the anode of the first diode and the anode of the second diode are connected with the first end of the first TVS tube, the anode of the third diode is connected with the CAN communication high-order data line, the anode of the fourth diode is connected with the CAN communication low-order data line, the cathode of the third diode and the cathode of the fourth diode are connected with the first end of the second TVS tube, and the second end of the first TVS tube and the second end of the second TVS are connected with the chassis ground. By adopting the protective circuit, a communication interface of the airborne aerospace equipment can be prevented from being threatened by thunder, and normal communication can be ensured.
Description
Technical field
The present invention relates to CAN communication protective circuit, in particular, a kind of protective circuit for the external CAN communication of airborne air equipment.
Background technology
Present generation aircraft proposes more and more higher requirement to environmental suitability especially fail safe, thunder and lightning is as a kind of natural phenomena, happen occasionally in the flight course of aircraft, thus thunder and lightning is as the destructive energy of one, threaten the normal work of airborne equipment at any time, also threaten the safe operation of aircraft.In guarantee flight safety, vital meaning is had to the protection of airborne equipment communication interface.
TVS pipe is also referred to as transient voltage suppressor; when the two poles of the earth of TVS diode are subject to reverse transient state high energy impact events; it can with the speed of 10-12 second-time; the high impedance of its two interpolar is become Low ESR; absorb the surge power up to thousands of watts; make the voltage clamp of two interpolars in a predetermined value, effectively protect components and parts from the damage of surge pulse.At present, had dealer TVS pipe to be introduced in airborne equipment communication, but find in practical application to there will be between airborne equipment cannot the problem of proper communication, discovery is studied through applicant, this problem is, TVS pipe has larger junction capacitance, communication can produce certain impact.
Summary of the invention
The object of the invention is to solve that protectiveness in prior art is poor, the excessive problem affecting communication of junction capacitance on communication link, a kind of novel protective circuit for the external CAN communication of airborne air equipment is provided.
To achieve these goals, technical scheme of the present invention is achieved in that a kind of protective circuit for the external CAN communication of airborne air equipment, include, CAN communication high position data line, CAN communication low data line, first diode, second diode, 3rd diode, 4th diode, first TVS pipe and the second TVS pipe, wherein, the negative pole of described first diode connects CAN communication high position data line, the negative pole of described two diodes connects CAN communication low data line, the positive pole of described first diode and the positive pole of described second diode all connect the first end of described first TVS pipe, the positive pole of described 3rd diode connects CAN communication high position data line, the positive pole of described four diodes connects CAN communication low data line, the negative pole of described 3rd diode and the negative pole of described 4th diode all connect the first end of described second TVS pipe, second end of described first TVS pipe and the second end of described second TVS pipe all connect casing ground.
Compared with prior art, advantage of the present invention at least comprises following: airborne air equipment communication interface can be allowed to avoid thunder and lightning to threaten, and simultaneously normal communication operation.
Accompanying drawing explanation
Fig. 1 is the structural representation of one embodiment of the invention.
Embodiment
Below in conjunction with drawings and Examples, the present invention is elaborated.
Refer to Fig. 1, shown in figure is a kind of protective circuit for the external CAN communication of airborne air equipment, include, CAN communication high position data line CAN_H1, CAN communication low data line CAN_L0, first diode D1, second diode D2, 3rd diode D3, 4th diode D4, first TVS pipe TVS1 and the second TVS pipe TVS2, wherein, the negative pole of described first diode D1 meets CAN communication high position data line CAN_H1, the negative pole of described two diodes meets CAN communication low data line CAN_L0, the positive pole of described first diode D1 and the positive pole of described second diode D2 all connect the first end of described first TVS pipe TVS1, the positive pole of described 3rd diode D3 meets CAN communication high position data line CAN_H1, the positive pole of described four diodes meets CAN communication low data line CAN_L0, the negative pole of described 3rd diode D3 and the negative pole of described 4th diode D4 all connect the first end of described second TVS pipe TVS2, second end of described first TVS pipe TVS1 and second end of described second TVS pipe TVS2 all connect casing ground.
In circuit; described first TVS pipe TVS1 and described second TVS pipe TVS2 can play the effect of shielding lightning wave; it by thunder and lightning high pressure clamper internal electrical magnet-sensitive element institute receptible scope in; play a protective role to internal components, the emittance that thunder and lightning is produced is unlikely to enter into airborne equipment inside.
In the selection of TVS pipe, will determine according to the size of external lightning energy, its Selection parameter comprises off-line voltage, clamp voltage range, and peak-peak energy etc.When the selection of device, two-way TVS pipe be selected, because lightning wave may just, also may be born, the derate coefficient of temperature will be considered simultaneously, to meet the adaptive needs of aircraft environment.4 the low junction capacitance diodes (namely, the first diode D1, the second diode D2, the 3rd diode D3 and the 4th diode D4) increased can reduce TVS pipe effectively to be affected the communication quality of communication link.
Below only have expressed embodiments of the present invention, it describes comparatively concrete and detailed, but can not therefore be construed as limiting the scope of the patent.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection range of patent of the present invention should be as the criterion with claims.
Claims (2)
1. the protective circuit for the external CAN communication of airborne air equipment, it is characterized in that, include, first diode, second diode, 3rd diode, 4th diode, first TVS pipe and the second TVS pipe, wherein, the negative pole of described first diode connects CAN communication high position data line, the negative pole of described two diodes connects CAN communication low data line, the positive pole of described first diode and the positive pole of described second diode all connect the first end of described first TVS pipe, the positive pole of described 3rd diode connects CAN communication high position data line, the positive pole of described four diodes connects CAN communication low data line, the negative pole of described 3rd diode and the negative pole of described 4th diode all connect the first end of described second TVS pipe, second end of described first TVS pipe and the second end of described second TVS pipe all connect casing ground.
2. a kind of protective circuit for the external CAN communication of airborne air equipment according to claim 1, is characterized in that, described first TVS pipe and described second TVS pipe are two-way TVS pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510871359.0A CN105356439A (en) | 2015-12-02 | 2015-12-02 | Protective circuit for external CAN (Controller Area Network) communication of airborne aerospace equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510871359.0A CN105356439A (en) | 2015-12-02 | 2015-12-02 | Protective circuit for external CAN (Controller Area Network) communication of airborne aerospace equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105356439A true CN105356439A (en) | 2016-02-24 |
Family
ID=55332348
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510871359.0A Pending CN105356439A (en) | 2015-12-02 | 2015-12-02 | Protective circuit for external CAN (Controller Area Network) communication of airborne aerospace equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105356439A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201417941Y (en) * | 2009-06-08 | 2010-03-03 | 杭州华三通信技术有限公司 | Interface protection circuit |
| CN201994655U (en) * | 2010-12-11 | 2011-09-28 | 株洲普天中普防雷科技有限公司 | Lightning protector for power supply network of Ethernet |
-
2015
- 2015-12-02 CN CN201510871359.0A patent/CN105356439A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201417941Y (en) * | 2009-06-08 | 2010-03-03 | 杭州华三通信技术有限公司 | Interface protection circuit |
| CN201994655U (en) * | 2010-12-11 | 2011-09-28 | 株洲普天中普防雷科技有限公司 | Lightning protector for power supply network of Ethernet |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20160224 |