CN203261000U - Two-in-one lightning protection device for video monitoring system - Google Patents
Two-in-one lightning protection device for video monitoring system Download PDFInfo
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- CN203261000U CN203261000U CN 201320183173 CN201320183173U CN203261000U CN 203261000 U CN203261000 U CN 203261000U CN 201320183173 CN201320183173 CN 201320183173 CN 201320183173 U CN201320183173 U CN 201320183173U CN 203261000 U CN203261000 U CN 203261000U
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Abstract
The utility model discloses a two-in-one lightning protection device for a video monitoring system, comprising a signal protection circuit and a power protection circuit, wherein both the signal circuit protection and the power protection circuit are provided with multiple levels of protection, including lightning discharge protection and common-mode and differential-mode protection. According to the utility model, over-current protection and over-voltage protection are realized, capacitance between lines is very small, and back-end equipment can be fully protected.
Description
Technical field
The utility model relates to emergency protection circuit device for electric, relates in particular to a kind of two-in-one lightning for video monitoring system.
Background technology
Along with developing rapidly of the Internet science and technology, the Internet has become the indispensable instrument of people's live and work.When but natural thunder and lightning occurs, can cause the current surge of induction, breaking-up equipment in power supply and communication line.Its reason is it is because the electronic equipment internal structure height is integrated on the one hand, very lagre scale integrated circuit (VLSIC) (VLSI) chip for example, equipment is withstand voltage, the level of anti-overcurrent descends thereby cause, and the ability to bear of thunder and lightning as induction thunder or switching overvoltage surge descended; Be because the signal source path increases on the other hand, system was than more easily suffering in the past the intrusion of lightning wave, and surge voltage can be scurried into computer equipment from approach such as power line or holding wires.
The lightning protection device that is used for video monitoring system has in the market been done some simple safeguard procedures, and some employing first class of protection circuit cause the rear end residual voltage very high; Perhaps adopt the common mode protective circuit, cause between line very high; The perhaps Transient Suppression Diode (TVS pipe) in parallel in the second level causes between line the appearance value very large, affects communication quality; Perhaps earth connection and holding wire do not add isolation, and causing plays a reversed role on ground wire affects communication quality.
The utility model content
The utility model has proposed a kind of two-in-one lightning for video monitoring system in order to address the above problem.
The two-in-one lightning that is used for video monitoring system that the utility model proposes; Comprise signal protection circuit and power protecting circuit; Described signal protection circuit comprises ceramic gas discharge tube G1; G2; Resettable fuse P1; P2; Fast reaction diode D1; D2; D3; D4; D5; D6; Transient Suppression Diode T1; Described G1; The input of G2 connects respectively signal two inputs; P1; P2 is connected on respectively on two holding wires; D1; D2; D3 one end joins; Series connection T1; Again with D4; D5; The end series connection that D6 joins; D1; D4 and D3; The other end of D6 connects respectively signal two outputs; D2; The other end of D5 and G1; The output splicing ground connection of G2; Described power protecting circuit comprises ceramic gas discharge tube G3, G4; resettable fuse P3, P4; piezo-resistance M1, M2, M3, M4, M5, M6; common mode inductance L1, L2; after M1, G3 series connection, two ends connect respectively power supply two inputs; M2, M3 one end connect respectively power supply two inputs; M4, M5 one end connect respectively power supply two outputs; connect G4 ground connection after the other end splicing of M2, M3, M4, M5; L1, P3 combination and L2, P4 combination; be connected on respectively on two power lines, the two ends of M6 connect respectively power supply two outputs.
In one embodiment, signal protection circuit and power protecting circuit series connection G5 ground connection.
Other video lightning protection devices of the utility model are compared, and have adopted the ultra-low capacitance design, utilize the series connection of six fast reaction diodes and Transient Suppression Diode, make the electric capacity between holding wire lower, do not affect the transmission of vision signal; Power protecting circuit adopts the overcurrent-overvoltage duplicate protection; connected successively common mode inductance and resettable fuse; open-circuit line immediately when over-current state occurring; be high-impedance state; with the protection rear end equipment; also adopted special ground connection isolation design, the impact of having avoided ground connection to crosstalk fully makes rear end equipment move more stable, safety.
Description of drawings
Below in conjunction with drawings and Examples, the utility model is described further, wherein:
Fig. 1 is the circuit diagram of the utility model one embodiment.
Embodiment
As shown in Figure 1; the two-in-one lightning that is used for video monitoring system that the utility model one embodiment proposes; comprise signal protection circuit and power protecting circuit; the signal protection circuit comprises ceramic gas discharge tube G1, G2; resettable fuse P1, P2; fast reaction diode D1, D2, D3, D4, D5, D6; Transient Suppression Diode T1; power protecting circuit comprises ceramic gas discharge tube G3, G4; resettable fuse P3, P4; piezo-resistance M1, M2, M3, M4, M5, M6, common mode inductance L1, L2.
In the signal protection circuit; the input of G1, G2 connects respectively signal two inputs; P1, P2 are connected on respectively on two holding wires; D1, D2, D3 one end join; series connection T1; connect with the end that D4, D5, D6 join, the other end of D1, D4 and D3, D6 connects respectively signal two outputs again, the output splicing ground connection of the other end of D2, D5 and G1, G2.Wherein, Ceramic gas discharge tube G1; G2; Resettable fuse P1; P2 consists of first order protection; When the induction thunder impacts from video port; Electric breakdown phenomena occurs in ceramic gas discharge tube internal discharge gap immediately; This moment, ceramic gas discharge tube was equivalent to a good conductor; Surge voltage namely is short-circuited to rapidly near no-voltage in the time at 50ns; Surge current is imported rapidly ground; Absorbed most surge; Thereby protected late-class circuit; And be connected on respectively P1 on two holding wires; P2 further protects late-class circuit; The one, overcurrent protection is arranged; The 2nd, time-delay is played in the impedance in its 2 Europe; The effect of buffering.Fast reaction diode D1, D2, D3, D4, D5, D6 and Transient Suppression Diode T1 carry out second level protection; although the instantaneous power of ceramic gas discharge tube is large; but residual voltage is very high; so Transient Suppression Diode is particularly important; when Transient Suppression Diode is subject to oppositely large surge impact; it can be with the speed of 1ps with the impedance of its two interpolar by high step-down; the surge power of absorption up to thousands of watts; make the current potential clamper of two interpolars in predetermined value, effectively protect components and parts in rear end equipment to avoid the infringement of surge pulse.In addition; D4; T1; D3 and D6; T1; D1 has played differential mode (between line) protective effect; D4; T1; D2 and D6; T1; D2 has played the common mode protective effect; The protective circuit of the second level can be accomplished common mode; The residual voltage clamper of differential mode; Can make like this residual voltage lower; And D1; D2; D3 and D4; D5; D6 and T1 series connection; The combinational circuit that is formed by fast reaction diode and Transient Suppression Diode can reduce the junction capacitance of single separate type Transient Suppression Diode; Due to the junction capacitance of fast reaction diode than little many of Transient Suppression Diode; The junction capacitance of combinational circuit depends primarily on the fast reaction diode; Make the electric capacity between holding wire lower; The reaction speed of fast reaction diode is faster than Transient Suppression Diode; Therefore can not affect Transient Suppression Diode to the clamping action of residual voltage.
In power protecting circuit; after M1, G3 series connection, two ends connect respectively power supply two inputs; the protection of formation differential mode; M2, M3 one end connect respectively power supply two inputs; M4, M5 one end connect respectively power supply two outputs, connect G4 ground connection after the other end splicing of M2, M3, M4, M5, L1, P3 combination and L2, P4 combination; be connected on respectively on two power lines, the two ends of M6 connect respectively power supply two outputs.M1; M2; M3 is high-power piezo-resistance; M4; M5; M6 is the small-power piezo-resistance; M2; M3 consists of the common mode protection; When the induction thunder impacts from power supply two inputs; M2; M3 in several ns with surge through the G4 the earth of releasing; Be connected on the L1 on power line; L2; P3; P4 plays the effect of a buffering time-delay to another part surge; Under normal condition; P3 flows through on circuit; The electric current of P4 is very little; P3; P4 is low resistive state; When circuit is short-circuited or transship; P3 flows through; The large electric current of P4 raises its temperature; Be high-impedance state; Operating current reduces rapidly; Its small electric current makes P3; P4 is in guard mode always; After outage and fault eliminating; Its temperature descends; P3; P4 recovers normal condition; Be again low resistive state; Thereby circuit is limited and protects; P3; P4 has played the protective effect of overcurrent here.M4, M5 are identical with the protection form of M2, M3, also consist of the common mode protection, and M6 is connected in parallel on the output of two power lines, has formed the differential mode protection.
Play a reversed role from the earth in order to prevent from disturbing; power protecting circuit and the signal protection circuit G5 that all connected before ground connection; under normal condition, G5 is in open-circuit condition; G5 is the switching mode components and parts, when the induction radar being arranged in circuit after the threshold values of ceramic gas discharge tube, will forward the state of a closure to; its maximum transient state through-current capacity can reach 10KA; the earth of directly surge being released, surge ceramic gas discharge tube later present again high-impedance state, can not affect the normal transmission of signal.
The above is only preferred embodiment of the present utility model; not in order to limit the utility model; all any modifications of doing within spirit of the present utility model and principle, be equal to and replace and improvement etc., within all should being included in protection range of the present utility model.
Claims (2)
1. two-in-one lightning that is used for video monitoring system; Comprise signal protection circuit and power protecting circuit; It is characterized in that; Described signal protection circuit comprises ceramic gas discharge tube G1; G2; Resettable fuse P1; P2; Fast reaction diode D1; D2; D3; D4; D5; D6; Transient Suppression Diode T1; Described G1; The input of G2 connects respectively signal two inputs; P1; P2 is connected on respectively on two holding wires; D1; D2; D3 one end joins; Series connection T1; Again with D4; D5; The end series connection that D6 joins; D1; D4 and D3; The other end of D6 connects respectively signal two outputs; D2; The other end of D5 and G1; The output splicing ground connection of G2;
Described power protecting circuit comprises ceramic gas discharge tube G3, G4; resettable fuse P3, P4; piezo-resistance M1, M2, M3, M4, M5, M6; common mode inductance L1, L2; after M1, G3 series connection, two ends connect respectively power supply two inputs; M2, M3 one end connect respectively power supply two inputs; M4, M5 one end connect respectively power supply two outputs; connect G4 ground connection after the other end splicing of M2, M3, M4, M5; L1, P3 combination and L2, P4 combination; be connected on respectively on two power lines, the two ends of M6 connect respectively power supply two outputs.
2. the two-in-one lightning for video monitoring system as claimed in claim 1, is characterized in that, signal protection circuit and power protecting circuit series connection G5 ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320183173 CN203261000U (en) | 2013-04-12 | 2013-04-12 | Two-in-one lightning protection device for video monitoring system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320183173 CN203261000U (en) | 2013-04-12 | 2013-04-12 | Two-in-one lightning protection device for video monitoring system |
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| Publication Number | Publication Date |
|---|---|
| CN203261000U true CN203261000U (en) | 2013-10-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320183173 Expired - Fee Related CN203261000U (en) | 2013-04-12 | 2013-04-12 | Two-in-one lightning protection device for video monitoring system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108761157A (en) * | 2018-04-24 | 2018-11-06 | 河南机电职业学院 | A kind of electronic message terminal |
-
2013
- 2013-04-12 CN CN 201320183173 patent/CN203261000U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108761157A (en) * | 2018-04-24 | 2018-11-06 | 河南机电职业学院 | A kind of electronic message terminal |
| CN108761157B (en) * | 2018-04-24 | 2023-03-21 | 河南机电职业学院 | Electronic information terminal |
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Legal Events
| Date | Code | Title | Description |
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| 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: 20131030 Termination date: 20180412 |
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| CF01 | Termination of patent right due to non-payment of annual fee |