CN104810816A - Lightning protection circuit design for RS422 signal interface of electronic equipment - Google Patents
Lightning protection circuit design for RS422 signal interface of electronic equipment Download PDFInfo
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- CN104810816A CN104810816A CN201510140619.7A CN201510140619A CN104810816A CN 104810816 A CN104810816 A CN 104810816A CN 201510140619 A CN201510140619 A CN 201510140619A CN 104810816 A CN104810816 A CN 104810816A
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Abstract
The invention discloses lightning protection circuit design for an RS422 signal interface of electronic equipment, and belongs to the technical field of safety of electronic equipment. The lightning protection circuit design is characterized by comprising a primary lightning protection circuit and a secondary lightning protection circuit, the primary lightning protection circuit comprises a gas discharge tube G1, a current limiting resistor and a TVS tube P21, and the secondary lightning protection circuit comprises a gas discharge tube Y1, a gas discharge tube Y2, a TVS tube P1 and a TVS tube P2. Two levels of lightning protection circuits including leakage and voltage limiting are used and effectively cooperated to ensure the validity of the protection circuit.
Description
Technical field
The present invention relates to the design of a kind of lightning protection circuit for electronic equipment RS422 signaling interface, belong to electronic equipments safety technical field.
Background technology
Overcurrent and overvoltage can be produced in electric/electronic device in thunder discharge process, equipment failure or temporary afunction can be caused to electric/electronic device, some electromagnetic interference signals simultaneously caused by thunder and lightning, system is coupled to by approach such as equipment interface, transmission line, space radiations, produce overvoltage or surge, microelectronic circuit is punctured, burns or change the logic state of circuit, thus control or task system etc. were temporarily lost efficacy or permanent failure.
The lightning protection of electronic equipment mainly needs the work doing port-guard and system earth two aspect, therefore the design of protection circuit wants to obtain satisfied lightning protection effect, following two objects should be reached: the output residual voltage of (1) lightning protection device lower than the overvoltage tolerance level of protected port, and should have certain allowance; (2) lightning protection device self has certain thunderbolt overcurrent tolerance level.That is, each port of communication equipment self will have certain overvoltage tolerance level, and not easily damaged when lightning protection device self is struck by lightning, and only has to meet at these 2 and could realize effective protection to the port of equipment.Lightning protection device, to the protection of port, is divided into common mode to protect and differential mode protection.
Summary of the invention
For overcoming the defect that prior art exists, solve the problems of the technologies described above, the invention provides the design of a kind of lightning protection circuit for electronic equipment RS422 signaling interface, RS422 is four line communications, wherein transmitting terminal positive pole (TX+), transmitting terminal negative pole (TX-), receiving terminal positive pole (RX+), receiving terminal negative pole (RX-).
The present invention adopts following technical scheme: a kind of design of the lightning protection circuit for electronic equipment RS422 signaling interface, it is characterized in that, comprise first order lightning protection circuit, second level lightning protection circuit, described first order lightning protection circuit comprises gas discharge tube G1, current-limiting resistance, TVS pipe P21, and described second level lightning protection circuit comprises gas discharge tube Y1, gas discharge tube Y2, TVS pipe P1, TVS pipe P2.
Preferably, one end ground connection after gas discharge tube Y1 is in parallel with TVS pipe P1, the other end is connected with transmitting terminal positive pole.
Preferably, one end ground connection after gas discharge tube Y2 is in parallel with TVS pipe P2, the other end is connected with transmitting terminal negative pole.
Preferably, gas discharge tube G1 is the two poles of the earth gas discharge tube.
Preferably, gas discharge tube Y1, gas discharge tube Y2 are three pole gas discharge tubes.
Preferably; current-limiting resistance comprises resettable fuse R1, resettable fuse R2; resettable fuse R1, resettable fuse R2 are as over-current protection device; be mainly used to stop big current to pass through; when current is excessive; fuse is fused, and circuit becomes open-circuit condition, protection interface current below.
The beneficial effect that the present invention reaches: (1) adopts the dual-electrode protecting circuit of releasing with pressure limiting, two-stage lightning protection circuit realizes effective cooperation, ensures the validity of protection circuit; (2) the self-recovery current limiting fuse in first order lightning protection circuit passes through for stoping big current, protection interface current below; (3) second level lightning protection circuit adopts TVS pipe to do differential mode and common mode protection respectively, below the withstand voltage tolerance limit output residual voltage of first order circuit being reduced to further RS422 serial ports, thus reaches the effect of protective circuit.
Accompanying drawing explanation
Fig. 1 is lightning protection circuit schematic diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.Following examples only for technical scheme of the present invention is clearly described, and can not limit the scope of the invention with this.
Fig. 1 is lightning protection circuit schematic diagram of the present invention, the wherein transmitting terminal positive pole (TX+1, TX+1 ') of RS422 signaling interface, transmitting terminal negative pole (TX-1, TX-1 '), PE is earth connection, the present invention adopts following technical scheme: a kind of design of the lightning protection circuit for electronic equipment RS422 signaling interface, it is characterized in that, comprise first order lightning protection circuit, second level lightning protection circuit, first order lightning protection circuit comprises gas discharge tube G1, current-limiting resistance, TVS pipe P21, and second level lightning protection circuit comprises gas discharge tube Y1, gas discharge tube Y2, TVS pipe P1, TVS pipe P2.
One end ground connection after gas discharge tube Y1 is in parallel with TVS pipe P1, the other end is connected with transmitting terminal positive pole; One end ground connection after gas discharge tube Y2 is in parallel with TVS pipe P2, the other end is connected with transmitting terminal negative pole; Gas discharge tube G1 is the two poles of the earth gas discharge tube; Gas discharge tube Y1, gas discharge tube Y2 are three pole gas discharge tubes; Current-limiting resistance comprises resettable fuse R1, resettable fuse R2, and resettable fuse R1, resettable fuse R2, as over-current protection device, are mainly used to stop big current to pass through; when current is excessive; fuse is fused, and circuit becomes open-circuit condition, protection interface current below.
Operation principle of the present invention: first order lightning protection circuit is common mode protection, adopt two-stage gas discharge tube, self-recovery current limiting fuse in first order protective circuit is as over-current protection device, be used for stoping big current to pass through, when current is excessive, fuse is fused, and circuit becomes open-circuit condition, protection interface current below; Second level lightning protection circuit adopts TVS pipe to do differential mode and common mode protection respectively, below the withstand voltage tolerance limit output residual voltage of first order lightning protection circuit being reduced to further RS422 serial ports, thus reaches the effect of protective circuit.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the prerequisite not departing from the technology of the present invention principle; can also make some improvement and distortion, these improve and distortion also should be considered as protection scope of the present invention.
Claims (6)
1. the design of the lightning protection circuit for electronic equipment RS422 signaling interface, it is characterized in that, comprise first order lightning protection circuit, second level lightning protection circuit, described first order lightning protection circuit comprises gas discharge tube G1, current-limiting resistance, TVS pipe P21, and described second level lightning protection circuit comprises gas discharge tube Y1, gas discharge tube Y2, TVS pipe P1, TVS pipe P2.
2. a kind of design of the lightning protection circuit for electronic equipment RS422 signaling interface according to claim 1, it is characterized in that, one end ground connection after described gas discharge tube Y1 is in parallel with described TVS pipe P1, the other end is connected with transmitting terminal positive pole.
3. a kind of design of the lightning protection circuit for electronic equipment RS422 signaling interface according to claim 2, it is characterized in that, one end ground connection after described gas discharge tube Y2 is in parallel with described TVS pipe P2, the other end is connected with transmitting terminal negative pole.
4. a kind of design of the lightning protection circuit for electronic equipment RS422 signaling interface according to claim 1, it is characterized in that, described gas discharge tube G1 is the two poles of the earth gas discharge tube.
5. a kind of design of the lightning protection circuit for electronic equipment RS422 signaling interface according to claim 1, it is characterized in that, described gas discharge tube Y1, described gas discharge tube Y2 are three pole gas discharge tubes.
6. a kind of design of the lightning protection circuit for electronic equipment RS422 signaling interface according to claim 1; it is characterized in that; described current-limiting resistance comprises resettable fuse R1, resettable fuse R2; described resettable fuse R1, described resettable fuse R2 are as over-current protection device; be mainly used to stop big current to pass through, when current is excessive, fuse is fused; circuit becomes open-circuit condition, protection interface current below.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510140619.7A CN104810816A (en) | 2015-03-30 | 2015-03-30 | Lightning protection circuit design for RS422 signal interface of electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510140619.7A CN104810816A (en) | 2015-03-30 | 2015-03-30 | Lightning protection circuit design for RS422 signal interface of electronic equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104810816A true CN104810816A (en) | 2015-07-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510140619.7A Pending CN104810816A (en) | 2015-03-30 | 2015-03-30 | Lightning protection circuit design for RS422 signal interface of electronic equipment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105186484A (en) * | 2015-07-30 | 2015-12-23 | 西安爱邦电磁技术有限责任公司 | Airborne equipment lightning suppressor with 422 communication function |
| CN106786469A (en) * | 2017-02-22 | 2017-05-31 | 庆安集团有限公司 | A kind of lightning protection circuit of ARINC429 buses |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203312799U (en) * | 2013-04-16 | 2013-11-27 | 深圳市瑞隆源电子有限公司 | Telephone line lightning arrester |
| WO2013189314A1 (en) * | 2012-06-28 | 2013-12-27 | 中兴通讯股份有限公司 | Protection circuit of communication interface |
| CN103986148A (en) * | 2014-06-03 | 2014-08-13 | 上海电机学院 | Lightning protection circuit of RS485 communication line |
| CN204597475U (en) * | 2015-03-30 | 2015-08-26 | 苏州锟恩电子科技有限公司 | A kind of lightning protection circuit for electronic equipment RS422 signaling interface |
-
2015
- 2015-03-30 CN CN201510140619.7A patent/CN104810816A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013189314A1 (en) * | 2012-06-28 | 2013-12-27 | 中兴通讯股份有限公司 | Protection circuit of communication interface |
| CN203312799U (en) * | 2013-04-16 | 2013-11-27 | 深圳市瑞隆源电子有限公司 | Telephone line lightning arrester |
| CN103986148A (en) * | 2014-06-03 | 2014-08-13 | 上海电机学院 | Lightning protection circuit of RS485 communication line |
| CN204597475U (en) * | 2015-03-30 | 2015-08-26 | 苏州锟恩电子科技有限公司 | A kind of lightning protection circuit for electronic equipment RS422 signaling interface |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105186484A (en) * | 2015-07-30 | 2015-12-23 | 西安爱邦电磁技术有限责任公司 | Airborne equipment lightning suppressor with 422 communication function |
| CN105186484B (en) * | 2015-07-30 | 2018-09-25 | 西安爱邦电磁技术有限责任公司 | A kind of airborne equipment thunder and righting blanker with 422 communication functions |
| CN106786469A (en) * | 2017-02-22 | 2017-05-31 | 庆安集团有限公司 | A kind of lightning protection circuit of ARINC429 buses |
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Application publication date: 20150729 |
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| RJ01 | Rejection of invention patent application after publication |