CN101710699B - Lightning protection device of monitoring equipment - Google Patents
Lightning protection device of monitoring equipment Download PDFInfo
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- CN101710699B CN101710699B CN 200910229117 CN200910229117A CN101710699B CN 101710699 B CN101710699 B CN 101710699B CN 200910229117 CN200910229117 CN 200910229117 CN 200910229117 A CN200910229117 A CN 200910229117A CN 101710699 B CN101710699 B CN 101710699B
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- lightning protection
- protection device
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Abstract
The invention belongs to the field of lightning protection devices and relates to a lightning protection device of monitoring equipment. The lightning protection device mainly comprises lightning protection components D1, D2, D3, D4, D5 and D6 and piezoresistors TR1 and TR2 and is characterized in that the lightning protection component D2 is connected between control buses RS485+/RS485-; the piezoresistors TR1 and TR2 are respectively connected in series on the control buses RS485+/RS485-; an input end is formed between video buses V+/V- to form a primary lightning protection subcircuit; the lightning protection components D3,D4,D5 and D6 are respectively connected among the control buses RS485+/RS485-, the video buses V+/V-, a power bus +12V and a ground lead GND to form a secondary lightning protection subcircuit with four input ends; and the lightning protection component D1 is connected between the input end and an output end to form a lightning protection subcircuit of the output end. Compared with the prior art, the lightning protection device has higher sensitivity and high reliability, is not easy to burn out and can automatically reply. Adopting the lightning protection circuit in products can enable the product reliability to be higher and the performance to be more stable.
Description
Technical field
The invention belongs to the lightning protection device field.
Background technology
As lightning protection device, except possessing the sensitivity of lightning protection, the very important point is the fail safe of protection equipment end.The lightning protection device circuit design will reach two purposes: the one, the lightning surge current drain of responding in the circuit is arrived the earth, and the 2nd, make by the surge voltage of protection equipment end to be limited in below the safe voltage of permission.Therefore how increasing lightning protection capability is the problem that this area is concerned about always.
Signal transmission system commonly used has two-wire line, common multicore cable, twisted-pair feeder multicore cable, coaxial cable etc.In siganl thunder-proof device, can reduce earth-free transmission circuit of two-wire and two kinds of two-wire or multi-thread transmission circuits that earth connection is arranged.Attention: here " " be meant " signal ground ", rather than refer to the earth (protection ground PE).Present lightning protection circuit adopts piezo-resistance to be connected in parallel in the circuit usually, as the lightning surge electric current through the time, lightning protection circuit work, the inflow of short circuit surge current, thereby protected product, its defective is exactly, circuit is easy to burn out, security performance is poor especially.
Summary of the invention
The present invention aims to provide a kind of lightning protection device with better lightning protection capability.Different for the lightning surge size of current that possibly meet with, can adopt two-stage signal lightning protection device or single-stage siganl thunder-proof device to protect.
The lightning protection device of watch-dog; Mainly form by lightning protection components and parts D1, D2, D3, D4, D5, D6 and piezo-resistance TR1, TR2; It is characterized in that: lightning protection components and parts D2 is connected between control bus RS485+ and the RS485-, and piezo-resistance TR1, TR2 are connected on respectively on control bus RS485+ and the RS485-, constitute input between video bus V+ and the V-; Constitute one-level lightning protection branch road; Lightning protection components and parts D3, D5 are connected between control bus RS485+ and the ground wire GND, and lightning protection components and parts D4, D6 are connected between control bus RS485-and the ground wire GND, constitute the secondary lightning protection branch road of four inputs; D1 is connected between video bus V+ and the V-, constitutes the lightning protection branch road.
When the lightning surge electric current passes through each bus, lightning protection components and parts D1, D2, D3, D4, D5, D6 conducting, short circuit releases a large amount of lightning surge electric currents, thereby has protected product.After thunder and lightning disappeared, the lightning protection components and parts returned to normal, and the bus operate as normal can not influence normal transmission.This lightning protection device is effective, practicality.
Compared with prior art, lightning protection sensitivity of the present invention is higher: this lightning protection device is easy burn-out not, can automatically reply, and reliability is high.Adopted this lightning protection circuit in the product, can make product reliability higher, performance is more stable.
Description of drawings
Fig. 1 is a structural representation of the present invention.
Embodiment
Referring to accompanying drawing 1; The lightning protection device of watch-dog mainly is made up of lightning protection components and parts D1, D2, D3, D4, D5, D6 and piezo-resistance TR1, TR2, it is characterized in that: lightning protection components and parts D2 is connected between control bus RS485+ and the RS485-; Piezo-resistance TR1, TR2 are connected on respectively on control bus RS485+ and the RS485-; Constitute input between video bus V+ and the V-, constitute one-level lightning protection branch road, lightning protection components and parts D3, D5 are connected between control bus RS485+ and the ground wire GND; Lightning protection components and parts D4, D6 are connected between control bus RS485-and the ground wire GND; Constitute the secondary lightning protection branch road of four inputs, D1 is connected between video bus V+ and the V-, constitutes the lightning protection branch road.
Described lightning protection device also comprises terminal J1, J2, J4, J5, J6, JP1, and wherein, 1,2 pin of terminal J1 are connected with 6,4 pin of J5 through control bus RS485-, RS485+ respectively; 1 pin of terminal J2 links to each other with 5 pin of J5 through ground wire GND, and 4 pin of J5 are connected with piezo-resistance TR1 and inductance L 1, and 6 pin of J5 are connected with piezo-resistance TR2 and inductance L 2; Lightning protection components and parts D2 two ends link to each other with 2 pin with 1 pin of J1 respectively, parallelly connected D4, D6 between parallelly connected D3, the D5 between 1 pin of J2 and 2 pin of J1,1 pin of J2 and 1 pin of J1; 1 pin of J5 is connected with 2 pin with 1 pin of J6 respectively with 2 pin, and between parallelly connected D1, be connected with 6 pin of J5 behind the 3 pin series resistance R1 of JP1,2 pin of JP1 are connected with 4 pin of J5; 1 pin of J2 is connected with 5 pin of J5,9 pin, 10 pin; 2 pin of J2 are connected with 8 pin of J5, resistance R 2 and light-emitting diode D7 series connection, and the negative electrode of light-emitting diode D7 connects 1 pin of J2; Anode connects an end of resistance R 2; The other end of resistance R 2 connects 2 pin of J2, and 1 pin of J4 is connected on 2 pin of J2, and 2 pin of J4 are connected on 1 pin of J2.Its course of work, the surge pulse that produces as thunder and lightning be during through bus, and the anti-thunder tube in the lightning protection circuit will the moment conducting, has blocked surge current and has got in the product, thereby guaranteed safety of products, has protected the operate as normal of product, has played the lightning protection effect.
The model of described lightning protection components and parts D2, D3, D4, D5, D6 is the Transient Suppression Diode of P6KE8.2CA.
The model of D1 is: two utmost point gas discharge tubes of BM075L-CA8.
The model of described piezo-resistance TR1, TR2 is: JK250-120.
Described terminal J1 is four pin.
Described terminal J2 is two pin.
Described terminal J5 is ten pin.
Described terminal J6 is four pin.
Described terminal JP1 is a tripod.
Between bus and product, increase lightning protection circuit, can improve the reliability of circuit, make communication safer, more reliable and stable.
Claims (10)
1. the lightning protection device of watch-dog; Mainly form by lightning protection components and parts D1, D2, D3, D4, D5, D6 and piezo-resistance TR1, TR2; It is characterized in that: lightning protection components and parts D2 is connected between control bus RS485+ and the RS485-, and piezo-resistance TR1, TR2 are connected on respectively on control bus RS485+ and the R5485-, constitute input between video bus V+ and the V-; Constitute one-level lightning protection branch road; Lightning protection components and parts D3, D5 are connected between control bus RS485+ and the ground wire GND, and lightning protection components and parts D4, D6 are connected between control bus RS485-and the ground wire GND, constitute the secondary lightning protection branch road of four inputs; D1 is connected between video bus V+ and the V-, constitutes the lightning protection branch road.
2. the lightning protection device of watch-dog according to claim 1, it is characterized in that: described lightning protection device also comprises terminal J1, J2, J4, J5, J6, JP1, wherein; 1,2 pin of terminal J1 are connected with 6,4 pin of J5 through control bus RS485-, RS485+ respectively, and 1 pin of terminal J2 links to each other with 5 pin of J5 through ground wire GND, and 4 pin of J5 are connected with piezo-resistance TR1 and inductance L 1; 6 pin of J5 are connected with piezo-resistance TR2 and inductance L 2, and lightning protection components and parts D2 two ends link to each other with 2 pin with 1 pin of J1 respectively, parallelly connected D3, D5 between 1 pin of J2 and 2 pin of J1; Parallelly connected D4, D6 between 1 pin of J2 and 1 pin of J1,1 pin of J5 is connected with 2 pin with 1 pin of J6 respectively with 2 pin, and between parallelly connected D1; Be connected with 6 pin of J5 behind the 3 pin series resistance R1 of JP1,2 pin of JP1 are connected with 4 pin of J5,1 pin of J2 is connected with 5 pin of J5,9 pin, 10 pin, 2 pin of J2 are connected with 8 pin of J5; Resistance R 2 and light-emitting diode D7 series connection; The negative electrode of light-emitting diode D7 connects 1 pin of J2, and anode connects an end of resistance R 2, and the other end of resistance R 2 connects 2 pin of J2; 1 pin of J4 is connected on 2 pin of J2, and 2 pin of J4 are connected on 1 pin of J2.
3. the lightning protection device of watch-dog according to claim 2, it is characterized in that: the model of described lightning protection components and parts D2, D3, D4, D5, D6 is: P6KE8.2CA.
4. lightning protection device according to claim 2 is characterized in that: the model of described D1 is: BM075L-CA8.
5. the lightning protection device of watch-dog according to claim 2, it is characterized in that: described terminal J1 is four pin.
6. the lightning protection device of watch-dog according to claim 2, it is characterized in that: described terminal J2 is two pin.
7. the lightning protection device of watch-dog according to claim 2, it is characterized in that: described terminal J5 is ten pin.
8. the lightning protection device of watch-dog according to claim 2, it is characterized in that: described terminal J6 is four pin.
9. the lightning protection device of watch-dog according to claim 2, it is characterized in that: described terminal JP1 is a tripod.
10. the lightning protection device of watch-dog according to claim 2, it is characterized in that: the model of described piezo-resistance TR1, TR2 is JK250-120.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910229117 CN101710699B (en) | 2009-12-11 | 2009-12-11 | Lightning protection device of monitoring equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910229117 CN101710699B (en) | 2009-12-11 | 2009-12-11 | Lightning protection device of monitoring equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101710699A CN101710699A (en) | 2010-05-19 |
| CN101710699B true CN101710699B (en) | 2012-05-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200910229117 Expired - Fee Related CN101710699B (en) | 2009-12-11 | 2009-12-11 | Lightning protection device of monitoring equipment |
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| CN (1) | CN101710699B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102509963A (en) * | 2011-11-03 | 2012-06-20 | 深圳莱克斯特电气有限公司 | Internet of things power saving protection and control system |
| CN102496813A (en) * | 2011-11-03 | 2012-06-13 | 深圳莱克斯特电气有限公司 | Novel measuring, electricity-saving and protective control system |
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2009
- 2009-12-11 CN CN 200910229117 patent/CN101710699B/en not_active Expired - Fee Related
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| CN101710699A (en) | 2010-05-19 |
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Granted publication date: 20120502 Termination date: 20121211 |