CN202231424U - Lightning protection device of intelligent electrical system communication lines - Google Patents
Lightning protection device of intelligent electrical system communication lines Download PDFInfo
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- CN202231424U CN202231424U CN2011203663450U CN201120366345U CN202231424U CN 202231424 U CN202231424 U CN 202231424U CN 2011203663450 U CN2011203663450 U CN 2011203663450U CN 201120366345 U CN201120366345 U CN 201120366345U CN 202231424 U CN202231424 U CN 202231424U
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Abstract
The utility model discloses a lightning protection device of intelligent electrical system communication lines, characterized by employing a two-level composite type lightning protection structure; an input terminal employs gas discharge tubes as a first level of lightning protection to discharge overcurrent; a second level employs transient voltage suppressor diodes as a second level of lightning protection. Wire wound no-sense resistors are in series connection between the first level of lightning protection and the second level of lightning protection to be ignition resistors of the first level lightning protection gas discharge tubes and current-limiting resistors of the second lightning protection level; protection circuits employ shield twisted-pair interfaces for connection. The beneficial effects are that according to a design of double protection, electrical equipment of an indoor communication system can avoid damage when the intelligent electrical system communication lines are struck by lightning.
Description
Technical field
The utility model relates to the lightning-protection engineering field, especially relates to a kind of lightning protection device of intelligent electric system communications line.
Background technology
The situation that communication line damages because of thunderbolt when the season that thunderstorm takes place frequently, takes place often, mainly be since communication system to have the part assembly to be exposed to outdoor, be easy to be struck by lightning and damage.If traditional intelligent electric system communications line is carried out wired long-distance transmissions and since holding wire have the part place outdoor, so be struck by lightning easily.Such as the RS-485 communication line of traditional photovoltaic intelligence header box, it adopts the Shielded Twisted Pair transmission signals, and there have the part transmission line to be placed in to be outdoor; Its structure is as shown in Figure 1; Because it is outdoor that most of twisted-pair feeder is placed in, the interference that is easy to be struck by lightning, and surge current introduced the electrical appliance part of indoor communication system; Cause the circuit can't operate as normal, even permanent damage.For overvoltage and the overcurrent that prevents that thunder and lightning from producing, in the intelligent electric system communications line, increase the secondary lightning protection.
The utility model content
The utility model is intended to address the above problem, and a kind of lightning protection device of intelligent electric system communications line is provided.
To achieve these goals, the utility model is an example with the RS-485 communication line of photovoltaic intelligence header box, adopts following technical scheme:
A kind of lightning protection device of intelligent electric system communications line; It is characterized in that, adopt the compound lightning protection structure of secondary, input adopts gas discharge tube as first order lightning protection; With the overcurrent of releasing, the second level adopts the transient voltage restraining diode as second level lightning protection.
Seal in the wire-wound noninductive resistance between said first order lightning protection and the second level lightning protection as the igniting resistance of first order lightning protection gas discharge tube and the current-limiting resistance of second level lightning protection.
The compound protection circuit of said secondary takes the Shielded Twisted Pair interface to connect.
If the intelligent electric system communications line is to adopt other communication mode, its every road transmission line all can adopt the secondary lightning protection structure in the lightning protection circuit of similar RS-485 communication line.
The beneficial effect of the utility model is: through the duplicate protection design, make that the electrical appliance part of indoor communication system exempted from destruction when the intelligent electric system communications line was struck by lightning.
Description of drawings
Fig. 1 is the communication line structural representation of photovoltaic traditional in background technology intelligence header box.
Fig. 2 is the lightning protection part-structure sketch map of RS-485 communication line.
Fig. 3 is the lightning protection part and RS-485 communication line syndeton sketch map of RS-485 communication line.
Embodiment
RS-485 communication line with photovoltaic intelligence header box is an example below, in conjunction with accompanying drawing and embodiment the utility model is done further to set forth:
Understand easily, according to the technical scheme of the utility model, do not changing under the utility model connotation, but one of ordinary skill in the art can propose the multiple frame mode and the execution mode of mutual alternative.Therefore, following embodiment and accompanying drawing only are the exemplary illustrations to the technical scheme of the utility model, and should not be regarded as the whole of the utility model or be regarded as qualification or the restriction to the utility model technical scheme.
A kind of lightning protection device of intelligent electric system communications line; Adopt the compound lightning protection structure of secondary; Input adopts gas discharge tube as first order lightning protection, and with the overcurrent of releasing, the second level adopts the transient voltage restraining diode as second level lightning protection.
Seal in the wire-wound noninductive resistance between said first order lightning protection and the second level lightning protection as the igniting resistance of first order lightning protection gas discharge tube and the current-limiting resistance of second level lightning protection.
The compound protection circuit of said secondary takes the Shielded Twisted Pair interface to connect.
Referring to Fig. 2, the RS-485 communication line adopts the secondary lightning protection, and at input, signal of communication is connected to the input A and the B port of RS-485 chip through connector CT15.Twisted-pair feeder adopts Shielded Twisted Pair, and the screen of Shielded Twisted Pair is connected with signal ground (DGND1) the Pin pin of connector CT15, and two holding wires of extraneous input are connected with the Pin pin of 485/A1 and 485/B1 respectively.In order to reach the purpose of secondary lightning protection; This Pin pin of the PGND of connector CT15 is called the earth terminals, and signal port 485/A1,485/B1 and power supply ground (GND1) are respectively through transient voltage restraining diode TVS4; Transient voltage restraining diode TVS5; Transient voltage restraining diode TVS6 and gas discharge tube GAS6, gas discharge tube GAS5, gas discharge tube GAS4 are connected to the earth (PGND).
Referring to Fig. 3, wire-wound noninductive resistance R20, R21, R22 are gas discharge tube GAS6, GAS5, the igniting resistance of GAS4; Isochrone is around noninductive resistance R20; R21 also plays each chip chamber buffer action of RS-485 in the bus, the breakdown or short circuit when the RS-485 chip, and cause when burning out chip; Be that differential bus is when being short-circuited; In order to prevent that the communication of other extension set is affected in the bus, protect other RS-485 communication extension set operate as normal, play the chip chamber buffer action in RS-485 signal output part series line around noninductive resistance R20 and wire-wound noninductive resistance R21.
When overvoltage produced, the effect of transient voltage restraining diode TVS4 was the overcurrent between 485/A1 and the earth (PGND) of releasing; The effect of transient voltage restraining diode TVS5 is the overcurrent between 485/B1 and the earth (PGND) of releasing; The effect of transient voltage restraining diode TVS6 is the overcurrent between vent discharge seedbed (GND1) and the earth (PGND); Work as electric current simultaneously and flow through wire-wound noninductive resistance R20; When wire-wound noninductive resistance R21 and wire-wound noninductive resistance R22, will raise the RS-485 signal (485/A1,485/B1) and the voltage between power supply ground (GND1) and the earth (PGND); Can impel gas discharge tube GAS6; Gas discharge tube GAS5, the gas discharge tube GAS4 conducting of lighting a fire makes the main energy of thunderbolt mainly in the lightning protected circuit of the first order, release.
When installing at the scene, because the carrier of RS-485 communication is a twisted-pair feeder, the characteristic impedance of twisted-pair feeder is about 120 ohm, so hold each and connect one 120 ohm build-out resistor the whole story at the network of RS485, can reduce the reflection of transmission signals.When short-distance transmission, can not need terminating resistance, promptly generally not need terminating resistance below 300 meters.Terminating resistance is connected on the two ends of transfer bus.
The above is merely the preferred embodiments of the utility model; The protection range of the utility model does not exceed with above-mentioned execution mode; As long as the equivalence that those of ordinary skills do according to the utility model institute disclosure is modified or changed, all should include in the protection range of putting down in writing in claims.
Claims (3)
1. the lightning protection device of an intelligent electric system communications line; It is characterized in that, adopt the compound lightning protection structure of secondary, input adopts gas discharge tube as first order lightning protection; With the overcurrent of releasing, the second level adopts the transient voltage restraining diode as second level lightning protection.
2. the lightning protection device of intelligent electric system communications line as claimed in claim 1; It is characterized in that, seal in the wire-wound noninductive resistance between said first order lightning protection and the second level lightning protection as the igniting resistance of first order lightning protection gas discharge tube and the current-limiting resistance of second level lightning protection.
3. the lightning protection device of intelligent electric system communications line as claimed in claim 1 is characterized in that, the compound protection circuit of said secondary takes the Shielded Twisted Pair interface to connect.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203663450U CN202231424U (en) | 2011-09-29 | 2011-09-29 | Lightning protection device of intelligent electrical system communication lines |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203663450U CN202231424U (en) | 2011-09-29 | 2011-09-29 | Lightning protection device of intelligent electrical system communication lines |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202231424U true CN202231424U (en) | 2012-05-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011203663450U Expired - Fee Related CN202231424U (en) | 2011-09-29 | 2011-09-29 | Lightning protection device of intelligent electrical system communication lines |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202231424U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103746620A (en) * | 2013-11-06 | 2014-04-23 | 广东威灵电机制造有限公司 | Motor driver and air conditioner |
| CN104167724A (en) * | 2014-09-08 | 2014-11-26 | 南京宁普防雷设备制造有限公司 | Isolating-type bidirectional communication signal lighting protection device |
| 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 |
| CN105896502A (en) * | 2014-11-05 | 2016-08-24 | 天津市吉涛电子科技有限公司 | Surge protector used for twisted pair |
-
2011
- 2011-09-29 CN CN2011203663450U patent/CN202231424U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103746620A (en) * | 2013-11-06 | 2014-04-23 | 广东威灵电机制造有限公司 | Motor driver and air conditioner |
| CN104167724A (en) * | 2014-09-08 | 2014-11-26 | 南京宁普防雷设备制造有限公司 | Isolating-type bidirectional communication signal lighting protection device |
| CN104167724B (en) * | 2014-09-08 | 2017-06-20 | 南京宁普防雷设备制造有限公司 | A kind of isolation type bidirectional signal of communication lightning protection device |
| CN105896502A (en) * | 2014-11-05 | 2016-08-24 | 天津市吉涛电子科技有限公司 | Surge protector used for twisted pair |
| 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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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120523 Termination date: 20120929 |