CN204597475U - A kind of lightning protection circuit for electronic equipment RS422 signaling interface - Google Patents
A kind of lightning protection circuit for electronic equipment RS422 signaling interface Download PDFInfo
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- CN204597475U CN204597475U CN201520180723.4U CN201520180723U CN204597475U CN 204597475 U CN204597475 U CN 204597475U CN 201520180723 U CN201520180723 U CN 201520180723U CN 204597475 U CN204597475 U CN 204597475U
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- protection circuit
- lightning protection
- gas discharge
- discharge tube
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Abstract
The utility model discloses a kind of lightning protection circuit for electronic equipment RS422 signaling interface, belong to electronic equipments safety technical field.The utility model adopts following technical scheme: a kind of 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.The utility model adopts the dual-electrode protecting circuit of releasing with pressure limiting, and two-stage lightning protection circuit realizes effective cooperation, ensures the validity of protection circuit.
Description
Technical field
The utility model relates to a kind of lightning protection circuit for electronic equipment RS422 signaling interface, belongs 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.
Utility model content
For overcoming the defect that prior art exists, solve the problems of the technologies described above, the utility model provides 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 utility model adopts following technical scheme: a kind of 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 utility model 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 utility model.
Embodiment
Below in conjunction with accompanying drawing, the utility model is further described.Following examples only for clearly the technical solution of the utility model being described, and can not limit protection range of the present utility model with this.
Fig. 1 is lightning protection circuit schematic diagram of the present utility model, the wherein transmitting terminal positive pole (TX+1 of RS422 signaling interface, TX+1 '), transmitting terminal negative pole (TX-1, TX-1 '), PE is earth connection, the utility model adopts following technical scheme: a kind of 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, 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 utility model: 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 preferred implementation of the present utility model; should be understood that; for those skilled in the art; under the prerequisite not departing from the utility model know-why; can also make some improvement and distortion, these improve and distortion also should be considered as protection range of the present utility model.
Claims (6)
1. 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 lightning protection circuit for electronic equipment RS422 signaling interface according to claim 1, 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 lightning protection circuit for electronic equipment RS422 signaling interface according to claim 2, 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 lightning protection circuit for electronic equipment RS422 signaling interface according to claim 1, is characterized in that, described gas discharge tube G1 is the two poles of the earth gas discharge tube.
5. a kind of lightning protection circuit for electronic equipment RS422 signaling interface according to claim 1, is characterized in that, described gas discharge tube Y1, described gas discharge tube Y2 are three pole gas discharge tubes.
6. a kind of 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 |
|---|---|---|---|
| CN201520180723.4U CN204597475U (en) | 2015-03-30 | 2015-03-30 | A kind of lightning protection circuit for electronic equipment RS422 signaling interface |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520180723.4U CN204597475U (en) | 2015-03-30 | 2015-03-30 | A kind of lightning protection circuit for electronic equipment RS422 signaling interface |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204597475U true CN204597475U (en) | 2015-08-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520180723.4U Expired - Fee Related CN204597475U (en) | 2015-03-30 | 2015-03-30 | A kind of lightning protection circuit for electronic equipment RS422 signaling interface |
Country Status (1)
| Country | Link |
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| CN (1) | CN204597475U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104810816A (en) * | 2015-03-30 | 2015-07-29 | 苏州锟恩电子科技有限公司 | Lightning protection circuit design for RS422 signal interface of electronic equipment |
| CN113315107A (en) * | 2021-06-16 | 2021-08-27 | 天津津航计算技术研究所 | Be applied to lightning protection circuit of aircraft 1394 bus |
-
2015
- 2015-03-30 CN CN201520180723.4U patent/CN204597475U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104810816A (en) * | 2015-03-30 | 2015-07-29 | 苏州锟恩电子科技有限公司 | Lightning protection circuit design for RS422 signal interface of electronic equipment |
| CN113315107A (en) * | 2021-06-16 | 2021-08-27 | 天津津航计算技术研究所 | Be applied to lightning protection circuit of aircraft 1394 bus |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150826 Termination date: 20160330 |