CN206712458U - A kind of lightning protection device suitable for the transmission lines of RS 485 - Google Patents
A kind of lightning protection device suitable for the transmission lines of RS 485 Download PDFInfo
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- CN206712458U CN206712458U CN201720242353.1U CN201720242353U CN206712458U CN 206712458 U CN206712458 U CN 206712458U CN 201720242353 U CN201720242353 U CN 201720242353U CN 206712458 U CN206712458 U CN 206712458U
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- lightning protection
- terminals
- suppression diode
- transient suppression
- protection circuit
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Abstract
The utility model discloses a kind of lightning protection device suitable for the transmission lines of RS 485; the one-level lightning protection circuit is realized using gas-discharge tube GDT; it is connected in the A wiring of the buses of RS 485 after the first inductor L1 and the first thermistor PPTC1 series connection in the two level lightning protection circuit, is connected to after the second inductor L2 and the second thermistor PPTC2 series connection in the B wiring of the buses of RS 485；The first Transient Suppression Diode TVS1 is connected across between the A terminals and B terminals of the buses of RS 485 in the three-level lightning protection circuit, is connected across after the second Transient Suppression Diode TVS2 and the 3rd Transient Suppression Diode TVS3 series connection between the A terminals and B terminals of the buses of RS 485.For the utility model during lightening strikes are suppressed, lightning protected component itself is excellent, has very strong anti-electromagnetic interference capability, and have the sufficiently fast response time to lightening strikes.
Description
Technical field
The utility model belongs to lightning-protection engineering field, and in particular to a kind of lightning protection suitable for RS-485 transmission lines is protected
Protection unit.
Background technology
The systems such as intelligent electric meter have been widely applied to the field of industry and life.Automatic data logging skill is used in ammeter
Art reads data by COM1, and most of situation uses remote reading mode, and remote reading mode should for ammeter
The not only safe but also saving time and money for.Realize that the key of the technology is to ensure that communication line is safe and reliable.Due to RS-
485 circuits have transmission, high RST noise suppressed, easy to control, low cost and other advantages over long distances, and turning into Mulit-point Connection can
Can, therefore, RS-485 turns into the standard communication interface of intelligent electric meter.But RS-485 transmission lines are commonly exposed to open air, therefore pole
Easily because the reason such as thunderbolt introduces overvoltage.And RS-485 transceiver operating voltages are relatively low, typically in 5V or so, itself is pressure-resistant
Also it is very low,, will punch through damage once overvoltage introduces between -7V~+12V；When there is strong surge energy to occur,
Even it can be seen that transceiver explosion, the phenomenon that wiring board is charred.
State Intellectual Property Office of the People's Republic of China discloses a kind of communication line thunder prevention device, Publication No.：
CN203707770U, date of publication are：2014.07.09, the communication line thunder prevention device is provided with firsts and seconds two-stage lightning protection circuit, and one
Level lightning protection circuit realizes that two level lightning protection circuit is realized using TVS anti-thunder tubes using TED485 anti-thunder tubes, wherein, FL TED485
Anti-thunder tube, TS are TVS anti-thunder tubes, and its annexation is：TED485 anti-thunder tube FL1, TED485 anti-thunder tube FL2, TVS anti-thunder tubes
TS1 and TVS anti-thunder tubes TS3 positive pole connects and is grounded, TED485 anti-thunder tube FL1, TVS anti-thunder tube TS1 negative poles and TVS anti-thunder tubes
TS2 positive pole is mutually connected in 485A terminals, TVS anti-thunder tube TS2, TVS anti-thunder tube TS3 and TED485 anti-thunder tubes FL2 negative pole phase
It is connected in 485B terminals；Lightning-protection module only need to be connected on RS-485 terminals by the patent using access RS-485 bus modes in parallel
It is upper, centralized automatic meter-reading terminal called and load-carrying ability are not influenceed, ensure terminal in thunderstorm season safe and stable operation, but
It is that the patent has much room for improvement in response speed.
Utility model content
The purpose of this utility model is overcome the deficiencies in the prior art, there is provided a kind of suitable for RS-485 transmission lines
Lightning protection device, including one-level lightning protection circuit, two level lightning protection circuit and three-level lightning protection circuit, when being struck by lightning, sensing
Overvoltage is introduced by the both ends of RS-485 buses, and gas-discharge tube GDT is cut significantly as one-level lightning protection circuit, lightning surge
It is weak to hectovolt, thermistor PPTC and inductor L as two level lightning protection circuit, responded in microsecond (μ s) rank, to surge electricity
Stream is further suppressed；Then by the three-level lightning protection circuit being made up of Transient Suppression Diode, in psec (ps) rank
Inside responded, and by voltage clamping in 8V or so, so as to realize the protection to back-end circuit；Moreover, the first transient state suppresses two
Pole pipe TVS1 is connected across between the A terminals of RS-485 buses and B terminals, the second Transient Suppression Diode TVS2 and the 3rd wink
State is connected across between the A terminals of RS-485 buses and B terminals after suppressing diode TVS3 series connection, realizes that differential mode is protected, the
Realize that common mode is protected by wired earth in two Transient Suppression Diode TVS2 and the 3rd Transient Suppression Diode TVS3 connection end
Shield, has very strong anti-electromagnetic interference capability.
To achieve the above object, the technical solution adopted in the utility model is as follows：
A kind of lightning protection device suitable for RS-485 transmission lines, including one-level lightning protection circuit, two level lightning protection circuit with
And three-level lightning protection circuit, the one-level lightning protection circuit realize that gas-discharge tube GDT is connected across RS- using gas-discharge tube GDT
Between the A terminals and B terminals of 485 buses, the two level lightning protection circuit includes the first thermistor PPTC1, the second temperature-sensitive
After resistance PPTC2, the first inductor L1, the second inductor L2, the first inductor L1 and the first thermistor PPTC1 series connection
It is connected in the A wiring of RS-485 buses, to be connected to RS-485 total after the second inductor L2 and the second thermistor PPTC2 series connection
In the B wiring of line；The three-level lightning protection circuit includes the first Transient Suppression Diode TVS1, the second Transient Suppression Diode
TVS2, the 3rd Transient Suppression Diode TVS3, the first Transient Suppression Diode TVS1 be connected across the A terminals of RS-485 buses with
Between B terminals, RS-485 is connected across after the second Transient Suppression Diode TVS2 and the 3rd Transient Suppression Diode TVS3 series connection
Between the A terminals and B terminals of bus, and the second Transient Suppression Diode TVS2 and the 3rd Transient Suppression Diode TVS3
Connection end passes through wired earth.
Preferably, the gas-discharge tube GDT is three-stage ceramic gas-discharge tube, its model 3R070TA-6.
Preferably, the first thermistor PPTC1 and the second thermistor PPTC2 is high molecular positive temp temperature-sensitive electricity
Resistance, its model KRG060.
Preferably, the first Transient Suppression Diode TVS1, the second Transient Suppression Diode TVS2, the 3rd transient state suppress
Diode TVS2 is bipolarity Transient Suppression Diode, its model SMDJ36CA.
Compared with prior art, the beneficial effects of the utility model are：The utility model includes one-level lightning protection circuit, two level
Lightning protection circuit and three-level lightning protection circuit, when lightening strikes occur, induced overvoltage is introduced by the both ends of RS-485 buses, gas
Body discharge tube GDT is weakened severely to hectovolt as one-level lightning protection circuit, the overvoltage of lightening strikes, and thermistor PPTC is micro-
Responded in second (μ s) rank, acted on simultaneously with inductor, further suppress surge current；Then pass through by Transient Suppression Diode
The three-level lightning protection circuit of TVS compositions, is responded in psec (ps) rank, and by voltage clamping in 8V or so, so as to realize
Protection to back-end circuit；During lightening strikes are suppressed, lightning protected component itself is excellent, and thunder and lightning is attacked
Hit with the sufficiently fast response time；Moreover, the first Transient Suppression Diode TVS1 be connected across the A terminals of RS-485 buses with
Between B terminals, RS-485 is connected across after the second Transient Suppression Diode TVS2 and the 3rd Transient Suppression Diode TVS3 series connection
Between the A terminals and B terminals of bus, realize that differential mode is protected, the second Transient Suppression Diode TVS2 and the 3rd transient state suppress
Realize that common mode is protected by wired earth, there is very strong anti-electromagnetic interference capability in diode TVS3 connection end.
Brief description of the drawings
Fig. 1 is system block diagram of the present utility model.
Fig. 2 is integrated circuit figure of the present utility model.
Embodiment
The utility model will be further described below in conjunction with the accompanying drawings.
With reference to the accompanying drawings 1 and accompanying drawing 2 shown in, a kind of lightning protection device suitable for RS-485 transmission lines, including one-level are prevented
Thunder and lightning road, two level lightning protection circuit and three-level lightning protection circuit, the one-level lightning protection circuit using gas-discharge tube GDT realize, two
Level lightning protection circuit realizes that three-level lightning protection circuit is realized using Transient Suppression Diode TVS using thermistor PPTC.
In the present embodiment, gas-discharge tube GDT is three-stage ceramic gas-discharge tube from model 3R070TA-6, gas
Discharge tube GDT is connected across between the A terminals of RS-485 buses and B terminals, when lightening strikes occur, induced overvoltage by
The both ends of RS-485 buses are introduced, and by gas-discharge tube GDT, overvoltage is weakened severely to hectovolt.
Thermistor PPTC selects model KRG060 high molecular positive temp thermistor, and the first thermistor PPTC1 leads to
Cross after being connected with the first inductor L1 and be connected in the A wiring of RS-485 buses, the second thermistor PPTC2 passes through the electricity of UI second
It is connected to after sensor L2 series connection in the B wiring of RS-485 buses；Two level lightning protection circuit can be rung in microsecond (μ s) rank
Should, the surge voltage weakened by gas-discharge tube GDT is further suppressed.
Transient Suppression Diode TVS selects model SMDJ36CA bipolarity Transient Suppression Diode, the suppression of the first transient state
Diode TVS1 processed is connected across between the A terminals of RS-485 buses and B terminals, the second Transient Suppression Diode TVS2 and
It is connected across after three Transient Suppression Diode TVS3 series connection between the A terminals of RS-485 buses and B terminals, realizes that differential mode is protected
Realized altogether by wired earth shield, the second Transient Suppression Diode TVS2 and the 3rd Transient Suppression Diode TVS3 connection end
Mould is protected, and has very strong anti-electromagnetic interference capability；Three-level lightning protection circuit is responded in psec (ps) rank, by overvoltage
Strangulation is in 8V or so, so as to realize the protection to back-end circuit；During lightening strikes are suppressed, lightning protected component itself
It is excellent, and there is the sufficiently fast response time to lightening strikes.
The utility model component is few, simple in construction, cost is low, and anti-electromagnetic interference capability is strong, has to lightening strikes fast
The response speed of speed, it is ensured that using the communication equipment of RS-485 buses in thunderstorm season safe and stable operation.
Above-described embodiment is only preferred embodiment of the present utility model, not to the limitation of scope of protection of the utility model,
In every case design principle of the present utility model, and the change for carrying out non-creativeness work on this basis and making are used, all should
Belong within the scope of protection of the utility model.
Claims (4)
1. a kind of lightning protection device suitable for RS-485 transmission lines, including one-level lightning protection circuit, two level lightning protection circuit and
Three-level lightning protection circuit, the one-level lightning protection circuit realize that gas-discharge tube (GDT) is connected across RS- using gas-discharge tube (GDT)
Between the A terminals and B terminals of 485 buses, it is characterised in that：The two level lightning protection circuit includes the first thermistor
(PPTC1), the second thermistor (PPTC2), the first inductor (L1), the second inductor (L2), first inductor (L1)
It is connected to after being connected with the first thermistor (PPTC1) in the A wiring of RS-485 buses, the second inductor (L2) and the second temperature-sensitive
It is connected to after resistance (PPTC2) series connection in the B wiring of RS-485 buses；The three-level lightning protection circuit includes the first transient state and suppresses two
Pole pipe (TVS1), the second Transient Suppression Diode (TVS2), the 3rd Transient Suppression Diode (TVS3), the first transient state suppress two poles
Pipe (TVS1) is connected across between the A terminals of RS-485 buses and B terminals, the second Transient Suppression Diode (TVS2) and the 3rd
It is connected across after Transient Suppression Diode (TVS3) series connection between the A terminals of RS-485 buses and B terminals, and the second transient state presses down
Diode (TVS2) processed and the connection end of the 3rd Transient Suppression Diode (TVS3) pass through wired earth.
A kind of 2. lightning protection device suitable for RS-485 transmission lines according to claim 1, it is characterised in that：It is described
Gas-discharge tube (GDT) is three-stage ceramic gas-discharge tube, its model 3R070TA-6.
A kind of 3. lightning protection device suitable for RS-485 transmission lines according to claim 1, it is characterised in that：It is described
First thermistor (PPTC1) and the second thermistor (PPTC2) are high molecular positive temp thermistor, its model
KRG060。
A kind of 4. lightning protection device suitable for RS-485 transmission lines according to claim 1, it is characterised in that：It is described
First Transient Suppression Diode (TVS1), the second Transient Suppression Diode (TVS2), the 3rd Transient Suppression Diode (TVS2) are equal
For bipolarity Transient Suppression Diode, its model SMDJ36CA.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720242353.1U CN206712458U (en) | 2017-03-14 | 2017-03-14 | A kind of lightning protection device suitable for the transmission lines of RS 485 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720242353.1U CN206712458U (en) | 2017-03-14 | 2017-03-14 | A kind of lightning protection device suitable for the transmission lines of RS 485 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206712458U true CN206712458U (en) | 2017-12-05 |
Family
ID=60470400
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720242353.1U Expired - Fee Related CN206712458U (en) | 2017-03-14 | 2017-03-14 | A kind of lightning protection device suitable for the transmission lines of RS 485 |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206712458U (en) |
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2017
- 2017-03-14 CN CN201720242353.1U patent/CN206712458U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20190121 Address after: 100088 Guanhai Building, 8 Guanchengyuan Building, North Third Ring Road, Haidian District, Beijing Patentee after: Beijing Huatai Yingxiang Aircraft Control Technology Co., Ltd. Address before: 611730 Pixian, Chengdu, Sichuan Province, Optics Valley town (Jing Rong town Chuang commune) 66, Dayu East Road, Optics Valley, 3 building, 309 room, Optics Valley, with -1 Patentee before: CHENGDU BINGDE TECHNOLOGY CO., LTD. |
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| TR01 | Transfer of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20171205 Termination date: 20190314 |
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| CF01 | Termination of patent right due to non-payment of annual fee |