CN204597472U - A kind of lightning protection circuit for electronic equipment RS232 signaling interface - Google Patents

A kind of lightning protection circuit for electronic equipment RS232 signaling interface Download PDF

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Publication number
CN204597472U
CN204597472U CN201520180705.6U CN201520180705U CN204597472U CN 204597472 U CN204597472 U CN 204597472U CN 201520180705 U CN201520180705 U CN 201520180705U CN 204597472 U CN204597472 U CN 204597472U
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CN
China
Prior art keywords
lightning protection
protection circuit
gas discharge
discharge tube
electronic equipment
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CN201520180705.6U
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Chinese (zh)
Inventor
杨俊民
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Suzhou Kunen Electronic Technology Co Ltd
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Suzhou Kunen Electronic Technology Co Ltd
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Priority to CN201520180705.6U priority Critical patent/CN204597472U/en
Application granted granted Critical
Publication of CN204597472U publication Critical patent/CN204597472U/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Abstract

The utility model discloses a kind of lightning protection circuit for electronic equipment RS232 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 RS232 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 current-limiting resistance, gas discharge tube, and described second level lightning protection circuit comprises TVS pipe.The utility model adopts the protection of two-stage lightning protection circuit, has structure simple, the advantage that operability is good.

Description

A kind of lightning protection circuit for electronic equipment RS232 signaling interface
Technical field
The utility model relates to a kind of lightning protection circuit for electronic equipment RS232 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.
RS232 signaling interface is on an electronic device as debugging interface, communication between plates interface and pilot signal interface; transmission range is no more than 15 meters; debugging interface uses more frequent; frequent charged plug; therefore interface can be subject to the impact of overvoltage, overcurrent; if do not protect, be easy to interface chip to damage.
Utility model content
The purpose of this utility model is to provide a kind of lightning protection circuit for electronic equipment RS232 signaling interface, the overvoltage that solution RS232 signaling interface is subject to because of frequent warm swap, the technical problem of over-current shock, what RS232 was the most basic is three line communications, one sends line (Tx), one receives line (Rx), a common wire (with reference to ground GND).
The utility model adopts following technical scheme: a kind of lightning protection circuit for electronic equipment RS232 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 current-limiting resistance, gas discharge tube, and described second level lightning protection circuit comprises TVS pipe.
Preferably, gas discharge tube comprises gas discharge tube G1, gas discharge tube G2, gas discharge tube G3, and gas discharge tube G1, gas discharge tube G2, gas discharge tube G3 are three pole gas discharge tubes.
Preferably, current-limiting resistance is resettable fuse, and resettable fuse is used for limiting overcurrent, when current is excessive, and open circuit, protection interface current below.
Preferably, resettable fuse comprises resettable fuse R1, resettable fuse R2, resettable fuse R3.
Preferably, resettable fuse R1 is arranged at and sends in line, and resettable fuse R2 is arranged at and receives in line, and resettable fuse R3 is arranged in common wire.
Preferably, TVS pipe comprises TVS pipe P1, TVS pipe P2, TVS pipe P3, TVS pipe P4, TVS pipe P5.
The beneficial effect that the utility model reaches: adopt the protection of two-stage lightning protection circuit; first order lightning protection circuit adopts gas discharge tube to play common mode protection; overcurrent is limited by resettable fuse; then differential mode and common mode protection is carried out by the TVS pipe of second level lightning protection circuit; and the output residual voltage of prime is reduced further; below the withstand voltage tolerance limit reaching RS232 signaling interface, thus realize 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 utility model proposes a kind of lightning protection circuit for electronic equipment RS232 signaling interface, comprise first order lightning protection circuit, second level lightning protection circuit, described first order lightning protection circuit comprises current-limiting resistance, gas discharge tube, and described second level lightning protection circuit comprises TVS pipe.
Gas discharge tube comprises gas discharge tube G1, gas discharge tube G2, gas discharge tube G3, and gas discharge tube G1, gas discharge tube G2, gas discharge tube G3 are three pole gas discharge tubes; Current-limiting resistance is resettable fuse, and resettable fuse is used for limiting overcurrent, when current is excessive, and open circuit, protection interface current below; Resettable fuse comprises resettable fuse R1, resettable fuse R2, resettable fuse R3; Resettable fuse R1 is arranged at and sends in line, and resettable fuse R2 is arranged at and receives in line, and resettable fuse R3 is arranged in common wire; TVS pipe comprises TVS pipe P1, TVS pipe P2, TVS pipe P3, TVS pipe P4, TVS pipe P5.
Operation principle of the present utility model: first order lightning protection circuit adopts gas discharge tube to play common mode protection; overcurrent is limited by resettable fuse; then differential mode and common mode protection is carried out by the TVS pipe of second level lightning protection circuit; and the output residual voltage of first order lightning protection circuit is reduced further; below the withstand voltage tolerance limit reaching RS232 serial ports, realize 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 RS232 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 current-limiting resistance, gas discharge tube, and described second level lightning protection circuit comprises TVS pipe.
2. a kind of lightning protection circuit for electronic equipment RS232 signaling interface according to claim 1, it is characterized in that, described gas discharge tube comprises gas discharge tube G1, gas discharge tube G2, gas discharge tube G3, and described gas discharge tube G1, described gas discharge tube G2, described gas discharge tube G3 are three pole gas discharge tubes.
3. a kind of lightning protection circuit for electronic equipment RS232 signaling interface according to claim 1, is characterized in that, described current-limiting resistance is resettable fuse; described resettable fuse is used for limiting overcurrent; when current is excessive, open circuit, protection interface current below.
4. a kind of lightning protection circuit for electronic equipment RS232 signaling interface according to claim 3, is characterized in that, described resettable fuse comprises resettable fuse R1, resettable fuse R2, resettable fuse R3.
5. a kind of lightning protection circuit for electronic equipment RS232 signaling interface according to claim 4, it is characterized in that, described resettable fuse R1 is arranged at and sends in line, and described resettable fuse R2 is arranged at and receives in line, and described resettable fuse R3 is arranged in common wire.
6. a kind of lightning protection circuit for electronic equipment RS232 signaling interface according to claim 1, it is characterized in that, described TVS pipe comprises TVS pipe P1, TVS pipe P2, TVS pipe P3, TVS pipe P4, TVS pipe P5.
CN201520180705.6U 2015-03-30 2015-03-30 A kind of lightning protection circuit for electronic equipment RS232 signaling interface Expired - Fee Related CN204597472U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201520180705.6U CN204597472U (en) 2015-03-30 2015-03-30 A kind of lightning protection circuit for electronic equipment RS232 signaling interface

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201520180705.6U CN204597472U (en) 2015-03-30 2015-03-30 A kind of lightning protection circuit for electronic equipment RS232 signaling interface

Publications (1)

Publication Number Publication Date
CN204597472U true CN204597472U (en) 2015-08-26

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN201520180705.6U Expired - Fee Related CN204597472U (en) 2015-03-30 2015-03-30 A kind of lightning protection circuit for electronic equipment RS232 signaling interface

Country Status (1)

Country Link
CN (1) CN204597472U (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104810815A (en) * 2015-03-30 2015-07-29 苏州锟恩电子科技有限公司 Lightning protection circuit design for RS232 signal interface of electronic equipment

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104810815A (en) * 2015-03-30 2015-07-29 苏州锟恩电子科技有限公司 Lightning protection circuit design for RS232 signal interface of electronic equipment

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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

Granted publication date: 20150826

Termination date: 20160330

CF01 Termination of patent right due to non-payment of annual fee