CN108173251A - A kind of lightning protection circuit of alarm control system - Google Patents
A kind of lightning protection circuit of alarm control system Download PDFInfo
- Publication number
- CN108173251A CN108173251A CN201810240405.0A CN201810240405A CN108173251A CN 108173251 A CN108173251 A CN 108173251A CN 201810240405 A CN201810240405 A CN 201810240405A CN 108173251 A CN108173251 A CN 108173251A
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- inductance
- input terminal
- lightning
- interface
- protection circuit
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- 230000007704 transition Effects 0.000 claims abstract description 41
- 230000005611 electricity Effects 0.000 claims description 11
- IJJVMEJXYNJXOJ-UHFFFAOYSA-N fluquinconazole Chemical class C=1C=C(Cl)C=C(Cl)C=1N1C(=O)C2=CC(F)=CC=C2N=C1N1C=NC=N1 IJJVMEJXYNJXOJ-UHFFFAOYSA-N 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000009102 absorption Effects 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/005—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection avoiding undesired transient conditions
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/045—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage adapted to a particular application and not provided for elsewhere
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- Emergency Protection Circuit Devices (AREA)
Abstract
The present invention discloses a kind of lightning protection circuit of alarm control system.In the lightning protection circuit, the input terminal of the first lightning wave receiving terminal, the first inductance and data input port is sequentially connected in series；Second lightning wave receiving terminal, first resistor, the second inductance and data input port input terminal be sequentially connected in series；Third lightning wave receiving terminal, second resistance, third inductance and data output input terminal be sequentially connected in series；First capacitance and varistor are both connected between the input terminal of positive pole interface and the input terminal of power cathode interface；The cathode of first transition diode is connected to the input terminal of data input port, and anode is connected to the input terminal of power cathode interface；The cathode of second transition diode is connected to the input terminal of data output, and anode is connected to the input terminal of power cathode interface；The input terminal of power cathode interface is directly connected with the 4th lightning wave receiving terminal.The lightning protection circuit of the present invention can prevent alarm and control keyboard from being destroyed by lightning wave.
Description
Technical field
The present invention relates to anti-thunder technical field, more particularly to a kind of lightning protection circuit of alarm control system.
Background technology
Honeywell (Honeywell) VISTA series alarm and its control keyboard are because its reliability is in security protection industry
It is widely used, the interface circuit of the alarm and its control keyboard is defeated including positive pole interface, power cathode interface, data
Entrance and data output, but the equipment interface design protection Shortcomings, the connecting line between keyboard and alarm host machine
The lightning wave of road sensing is easy to lead to the type damage of facilities, and to the safe and reliable operation of alarm system, there are huge
It threatens.
Invention content
The object of the present invention is to provide a kind of lightning protection circuit of alarm control system, so as to prevent alarm and its control
Keyboard processed is destroyed by lightning wave.
To achieve the above object, the present invention provides following schemes：
A kind of lightning protection circuit of alarm control system, the positive pole for being connected to alarm and its control keyboard connect
Mouth, power cathode interface, data input port and data output；The lightning protection circuit of the alarm control system includes：First
Inductance, the second inductance, third inductance, first resistor, second resistance, the first capacitance, the first transition diode, two pole of the second transition
Pipe and varistor；
One end of first inductance is connected to the first lightning wave receiving terminal, and the other end of first inductance is connected to electricity
The input terminal of source anode interface；One end of the first resistor is connected to the second lightning wave receiving terminal, the first resistor it is another
One end is connected to one end of second inductance, and the other end of second inductance is connected to the input terminal of data input port；Institute
The one end for stating second resistance is connected to third lightning wave receiving terminal, and the other end of the second resistance is connected to the third inductance
One end, the other end of the third inductance is connected to the input terminal of data output；One end of first capacitance is connected to
The input terminal of the positive pole interface, the other end are connected to the input terminal of the power cathode interface；The varistor
One end is connected to the input terminal of the positive pole interface, and the other end is connected to the input terminal of the power cathode interface；It is described
The cathode of first transition diode is connected to the input terminal of the data input port, and the other end is connected to the power cathode interface
Input terminal；The cathode of the second transition diode is connected to the input terminal of the data output, and the other end is connected to institute
State the input terminal of power cathode interface；The input terminal of the power cathode interface is directly connected with the 4th lightning wave receiving terminal.
Optionally, the inductance ratings of first inductance, the second inductance and third inductance are 220mH.
Optionally, the rated resistance of the first resistor and the second resistance is 100 Ω, and rated power is 2W.
Optionally, the rated capacity of first capacitance is 0.33 μ F.
Optionally, the model of the first transition diode and the second transition diode is 1.5KE12A.
Optionally, the model 10D180K of the varistor.
According to specific embodiment provided by the invention, the invention discloses following technique effects：The present invention passes through setting the
One inductance, the first capacitance and varistor are lowered into the voltage of the lightning wave of positive pole interface, pass through first resistor,
Two inductance and the first transition diode are lowered into the voltage of the lightning wave of data input pin, pass through second resistance, third electricity
Sense and the second transition diode are lowered into the voltage of the lightning wave of data output end, so as to fulfill to alarm and its control
The lightning protection of keyboard prevents alarm and its control keyboard from being destroyed by lightning wave.
Description of the drawings
It in order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to institute in embodiment
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the present invention
Example, for those of ordinary skill in the art, without having to pay creative labor, can also be according to these attached drawings
Obtain other attached drawings.
Fig. 1 is the circuit structure diagram of the lightning protection circuit embodiment of alarm control system of the present invention.
Specific embodiment
Below in conjunction with the attached drawing in the embodiment of the present invention, the technical solution in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other without making creative work
Embodiment shall fall within the protection scope of the present invention.
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, it is below in conjunction with the accompanying drawings and specific real
Applying mode, the present invention is described in further detail.
Fig. 1 is the circuit structure diagram of the lightning protection circuit embodiment of alarm control system of the present invention.
Referring to Fig. 1, the lightning protection circuit of the alarm control system is applied to Honeywell VISTA series alarm host machines
And control keyboard, it is connected on Honeywell VISTA series alarm host machines and control keyboard interface circuit, the interface circuit packet
Include positive pole interface, power cathode interface, data input port and data output.A part of structure of the interface circuit includes
First diode D1, second have electrode capacitance C2, third capacitance C3, third transition diode TVS3, the 4th transition diode TVS4,
3rd resistor R3 and the 4th resistance R4.The wherein output terminal of positive pole interface and the anode of the first diode D1 and third transition
The cathode connection of diode TVS3, the cathode of the first diode D1 are connected to the second anode for having electrode capacitance C2 and third capacitance C3
One end, power cathode interface be connected to the anode of third transition diode TVS3, second have the cathode of electrode capacitance C2, third electricity
Hold the other end of C3 and the anode of the 4th transition diode TVS4；The output terminal of data output is connected to the 4th transition diode
One end of the cathode of TVS4 and the 4th resistance R4；The output terminal of data input port is connected to one end of 3rd resistor R3；One or two
The cathode of pole pipe D1, the other end of 3rd resistor R3, the other end of the 4th resistance R4 and power cathode are all connected to interface circuit
Other parts.
First diode D1, second are forming power supply just by electrode capacitance C2, third capacitance C3 and third transition diode TVS3
Pole inputs and protection circuit, and in the case of not external lightning protection device, third transition diode TVS3 is in the impact for meeting with lightning wave
It is lower to be easy to breakdown, it cannot be worked normally so as to cause equipment.
3rd resistor R3 is directly connected with processor (not shown), if the not external lightning protection device of data input port, outside line
The high pressure lightning wave that road feel is answered can be directly impinging processor, be damaged processor.
4th transition diode TVS4 and the 4th resistance R4 forms simple data output protection circuit, if data output
Not external lightning protection device, then the 4th transition diode TVS4 is easy to breakdown under the impact for meeting with lightning wave, so as to cause setting
It is standby to be worked normally.
In order to realize the protection to third transition diode TVS3, the 4th transition diode TVS4 and processor, invent
The lightning protection circuit of the alarm control system of the application, the lightning protection circuit of the alarm control system include：First inductance
L1, the second inductance L2, third inductance L3, first resistor R1, second resistance R2, the first capacitance C1, the first transition diode TVS1,
Second transition diode TVS2 and varistor RV1；
One end of the first inductance L1 is connected to the first lightning wave receiving terminal, the other end connection of the first inductance L1
To the input terminal of positive pole interface；One end of the first resistor R1 is connected to the second lightning wave receiving terminal, first electricity
The other end of resistance R1 is connected to one end of the second inductance L2, and the other end of the second inductance L2 is connected to data input port
Input terminal；One end of the second resistance R2 is connected to third lightning wave receiving terminal, and the other end of the second resistance R2 connects
One end of the third inductance L3 is connected to, the other end of the third inductance L3 is connected to the input terminal of data output；It is described
One end of first capacitance C1 is connected to the input terminal of the positive pole interface, and the other end is connected to the power cathode interface
Input terminal；One end of the varistor RV1 is connected to the input terminal of the positive pole interface, and the other end is connected to the electricity
The input terminal of source cathode interface；The cathode of the first transition diode TVS1 is connected to the input terminal of the data input port,
The other end is connected to the input terminal of the power cathode interface；The cathode of the second transition diode TVS2 is connected to the number
According to the input terminal of delivery outlet, the other end is connected to the input terminal of the power cathode interface；The input of the power cathode interface
End is directly connected with the 4th lightning wave receiving terminal.
The inductance ratings of the first inductance L1, the second inductance L2 and third inductance L3 are 220mH.
The first resistor R1 and second resistance R2 is power resistor, rated resistance be 100 Ω, specified work(
Rate is 2W.
The rated capacity of the first capacitance C1 is 0.33 μ F.
The model of the first transition diode TVS1 and the second transition diode TVS2 are 1.5KE12A.
The model 10D180K of the varistor RV1.
In the present invention, the first lightning wave receiving terminal, the first inductance L1, the first capacitance C1 and varistor RV1 form first
Circuit, first line are used to carry out lightning protection to positive pole interface.If first line by lightning surge intrusion, lightning wave from
First lightning wave receiving terminal enters, during by the first inductance L1, based on the principle that the electric current for flowing through inductance cannot be mutated, lightning wave
Electric current can be clamped down on, be then based on principle that the voltage at capacitance both ends cannot be mutated and machine clamped down in varistor RV1 absorptions
Reason, the voltage of lightning wave can significantly be weakened so that into equipment remaining thunder and lightning wave voltage in safe range.
Second lightning wave receiving terminal, first resistor R1, the second inductance L2 and the first transition diode TVS1 form the second line
Road, the second circuit are used to carry out lightning protection to Data Input Interface.If the second circuit, by lightning surge intrusion, lightning wave is from
Two lightning wave receiving terminals enter, during by first resistor R1 and the second inductance L2, thunder and lightning wave energy absorbed by the power resistor and
Weaken, the voltage of lightning wave is clamped down on by the first transition diode TVS1, so as to drop in safe range.
Third lightning wave receiving terminal, second resistance R2, third inductance L3 and the second transition diode TVS2 form third line
Road, tertiary circuit are used to carry out lightning protection to data output interface.If tertiary circuit, by lightning surge intrusion, lightning wave is from
Three lightning wave receiving terminals enter, during by second resistance R2 and third inductance L3, thunder and lightning wave energy absorbed by the power resistor and
Weaken, the voltage of lightning wave is clamped down on by the second transition diode TVS2, so as to drop in safe range.
The present invention is by setting the first inductance L1, the first capacitance C1 and varistor RV1 to be lowered into positive pole and connect
The voltage of the lightning wave of mouth, data are lowered by first resistor R1, the second inductance L2 and the first transition diode TVS1
The voltage of the lightning wave of input terminal is lowered by second resistance R2, third inductance L3 and the second transition diode TVS2
The voltage of the lightning wave of data output end, so as to fulfill the lightning protection to alarm and its control keyboard, prevent alarm and
Its control keyboard is destroyed by lightning wave.
Specific case used herein is expounded the principle of the present invention and embodiment, and above example is said
The bright method and its core concept for being merely used to help understand the present invention；Meanwhile for those of ordinary skill in the art, foundation
The thought of the present invention, in specific embodiments and applications there will be changes.In conclusion the content of the present specification is not
It is interpreted as limitation of the present invention.
Claims (6)
1. a kind of lightning protection circuit of alarm control system, which is characterized in that be connected to the electricity of alarm and its control keyboard
Source anode interface, power cathode interface, data input port and data output；The lightning protection circuit packet of the alarm control system
It includes：First inductance, the second inductance, third inductance, first resistor, second resistance, the first capacitance, the first transition diode, second
Transition diode and varistor；
One end of first inductance is connected to the first lightning wave receiving terminal, and the other end of first inductance is being connected to power supply just
The input terminal of pole interface；One end of the first resistor is connected to the second lightning wave receiving terminal, the other end of the first resistor
One end of second inductance is connected to, the other end of second inductance is connected to the input terminal of data input port；Described
One end of two resistance is connected to third lightning wave receiving terminal, and the other end of the second resistance is connected to the one of the third inductance
End, the other end of the third inductance are connected to the input terminal of data output；One end of first capacitance is connected to described
The input terminal of positive pole interface, the other end of first capacitance are connected to the input terminal of the power cathode interface；It is described
One end of varistor is connected to the input terminal of the positive pole interface, and the other end of the varistor is connected to the electricity
The input terminal of source cathode interface；The cathode of the first transition diode is connected to the input terminal of the data input port, described
The anode of first transition diode is connected to the input terminal of the power cathode interface；The cathode of the second transition diode connects
The input terminal of the data output is connected to, the anode of the second transition diode is connected to the defeated of the power cathode interface
Enter end；The input terminal of the power cathode interface is directly connected with the 4th lightning wave receiving terminal.
A kind of 2. lightning protection circuit of alarm control system according to claim 1, which is characterized in that first electricity
The inductance ratings of sense, the second inductance and third inductance are 220mH.
A kind of 3. lightning protection circuit of alarm control system according to claim 1, which is characterized in that first electricity
The rated resistance of resistance and the second resistance is 100 Ω, and rated power is 2W.
A kind of 4. lightning protection circuit of alarm control system according to claim 1, which is characterized in that first electricity
The rated capacity of appearance is 0.33 μ F.
A kind of 5. lightning protection circuit of alarm control system according to claim 1, which is characterized in that first wink
The model for becoming diode and the second transition diode is 1.5KE12A.
A kind of 6. lightning protection circuit of alarm control system according to claim 1, which is characterized in that the pressure-sensitive electricity
The model 10D180K of resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810240405.0A CN108173251B (en) | 2018-03-22 | 2018-03-22 | Lightning protection circuit of alarm control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810240405.0A CN108173251B (en) | 2018-03-22 | 2018-03-22 | Lightning protection circuit of alarm control system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108173251A true CN108173251A (en) | 2018-06-15 |
| CN108173251B CN108173251B (en) | 2023-12-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810240405.0A Active CN108173251B (en) | 2018-03-22 | 2018-03-22 | Lightning protection circuit of alarm control system |
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| Country | Link |
|---|---|
| CN (1) | CN108173251B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110932250A (en) * | 2019-12-02 | 2020-03-27 | 国家电网公司西南分部 | Lightning protection circuit for communication power supply |
Citations (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4587588A (en) * | 1984-03-02 | 1986-05-06 | Perma Power Electronics, Inc. | Power line transient surge suppressor |
| CN2681423Y (en) * | 2003-12-17 | 2005-02-23 | 华为技术有限公司 | Lightning protection device |
| CN101227087A (en) * | 2008-01-08 | 2008-07-23 | 中兴通讯股份有限公司 | PoE port and lightning protection device thereof |
| CN101383508A (en) * | 2008-10-27 | 2009-03-11 | 摩比天线技术（深圳）有限公司 | Lightning protection circuit and antenna apparatus |
| US20100172063A1 (en) * | 2009-01-08 | 2010-07-08 | Zhenning Liu | Methods of improving the lightning immunity for an sspc based aircraft electric power distribution system |
| CN201854029U (en) * | 2010-11-23 | 2011-06-01 | 上海伊莱克斯实业有限公司 | Direct current power supply surge protection circuit |
| CN203231469U (en) * | 2013-05-08 | 2013-10-09 | 苏州昆拓热控系统股份有限公司 | Cabinet air conditioner having communication interface lightning protection function |
| CN203747498U (en) * | 2014-01-27 | 2014-07-30 | 广州雷盾通信科技有限公司 | Lightning-protection distribution box |
| CN204030574U (en) * | 2014-06-11 | 2014-12-17 | 惠州学院 | A kind of lightning protection circuit that is applicable to switch |
| CN204947590U (en) * | 2015-09-22 | 2016-01-06 | 成都新欣神风电子科技有限公司 | Integration lightning protection filter |
| CN205355802U (en) * | 2016-01-28 | 2016-06-29 | 天津仪控科技有限公司 | External power source's protection circuit |
| CN105764187A (en) * | 2016-03-23 | 2016-07-13 | 成都锐奕信息技术有限公司 | LED street lamp power supply system with two stages of lightning protection |
| CN105932655A (en) * | 2016-05-26 | 2016-09-07 | 南京信息工程大学 | Lightning-proof automatic meteorological station based on ARM9 and operation method thereof |
| CN106849048A (en) * | 2017-03-14 | 2017-06-13 | 成都秉德科技有限公司 | A kind of lightning protection device suitable for the transmission lines of RS 485 |
| CN206471814U (en) * | 2016-11-23 | 2017-09-05 | 四川赛尔特科技有限公司 | Network two-in-one lightning |
| CN207967925U (en) * | 2018-03-22 | 2018-10-12 | 佛山市新东方电子技术工程有限公司 | A kind of lightning protection circuit of alarm control system |
-
2018
- 2018-03-22 CN CN201810240405.0A patent/CN108173251B/en active Active
Patent Citations (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4587588A (en) * | 1984-03-02 | 1986-05-06 | Perma Power Electronics, Inc. | Power line transient surge suppressor |
| CN2681423Y (en) * | 2003-12-17 | 2005-02-23 | 华为技术有限公司 | Lightning protection device |
| CN101227087A (en) * | 2008-01-08 | 2008-07-23 | 中兴通讯股份有限公司 | PoE port and lightning protection device thereof |
| CN101383508A (en) * | 2008-10-27 | 2009-03-11 | 摩比天线技术（深圳）有限公司 | Lightning protection circuit and antenna apparatus |
| US20100172063A1 (en) * | 2009-01-08 | 2010-07-08 | Zhenning Liu | Methods of improving the lightning immunity for an sspc based aircraft electric power distribution system |
| CN201854029U (en) * | 2010-11-23 | 2011-06-01 | 上海伊莱克斯实业有限公司 | Direct current power supply surge protection circuit |
| CN203231469U (en) * | 2013-05-08 | 2013-10-09 | 苏州昆拓热控系统股份有限公司 | Cabinet air conditioner having communication interface lightning protection function |
| CN203747498U (en) * | 2014-01-27 | 2014-07-30 | 广州雷盾通信科技有限公司 | Lightning-protection distribution box |
| CN204030574U (en) * | 2014-06-11 | 2014-12-17 | 惠州学院 | A kind of lightning protection circuit that is applicable to switch |
| CN204947590U (en) * | 2015-09-22 | 2016-01-06 | 成都新欣神风电子科技有限公司 | Integration lightning protection filter |
| CN205355802U (en) * | 2016-01-28 | 2016-06-29 | 天津仪控科技有限公司 | External power source's protection circuit |
| CN105764187A (en) * | 2016-03-23 | 2016-07-13 | 成都锐奕信息技术有限公司 | LED street lamp power supply system with two stages of lightning protection |
| CN105932655A (en) * | 2016-05-26 | 2016-09-07 | 南京信息工程大学 | Lightning-proof automatic meteorological station based on ARM9 and operation method thereof |
| CN206471814U (en) * | 2016-11-23 | 2017-09-05 | 四川赛尔特科技有限公司 | Network two-in-one lightning |
| CN106849048A (en) * | 2017-03-14 | 2017-06-13 | 成都秉德科技有限公司 | A kind of lightning protection device suitable for the transmission lines of RS 485 |
| CN207967925U (en) * | 2018-03-22 | 2018-10-12 | 佛山市新东方电子技术工程有限公司 | A kind of lightning protection circuit of alarm control system |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110932250A (en) * | 2019-12-02 | 2020-03-27 | 国家电网公司西南分部 | Lightning protection circuit for communication power supply |
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| Publication number | Publication date |
|---|---|
| CN108173251B (en) | 2023-12-01 |
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