CN203278216U - Three-in-one lightning arrester used in video monitoring system - Google Patents
Three-in-one lightning arrester used in video monitoring system Download PDFInfo
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- CN203278216U CN203278216U CN 201320137872 CN201320137872U CN203278216U CN 203278216 U CN203278216 U CN 203278216U CN 201320137872 CN201320137872 CN 201320137872 CN 201320137872 U CN201320137872 U CN 201320137872U CN 203278216 U CN203278216 U CN 203278216U
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Abstract
The utility model discloses a three-in-one lightning arrester used in a video monitoring system. The three-in-one lightning arrester comprises a video signal protection circuit, an RS485 control and protection circuit and a power supply protection circuit. The three-in-one lightning arrester is mainly used for lightning stroke or surge protection of a security camera, and carrying out secondary protection on three groups of lines of video signals, control signals and a power supply. The three-in-one lightning arrester carries out common-mode protection and differential-mode protection on the three groups of lines respectively, and enables residual voltage to be controlled within a safe range. The signal line is connected with a fast recovery diode in series, thereby enabling the junction capacitance among components to be lower, and being low in insertion loss.
Description
Technical field
The utility model relates to light current lightning protection field, relates in particular to the three-in-one lightning arrester of a kind of power supply to video monitoring system, vision signal, RS485 control circuit.
Background technology
Along with China's expanding economy, country more and more payes attention to public safety, so the security protection industry plays a role also more and more important in public safety.Security monitoring video camera is being played the part of important role in safety-protection system, the performance of security monitoring video camera is in continuous improve at present, function is also enriched constantly, therefore internal component is also more and more accurate, Highgrade integration more and more, and a lot of security monitoring video cameras all are arranged on outdoor, easily be subject to the impact of electromagnetic pulse (induction thunder) at thunderstorm season, the induction thunder is the momentary pulse magnetic field that produces when dodging thunder, not only the security protection network is impacted, also can burn the security protection camera, so lightning protection function is a necessary guarantee of security monitoring video camera.
Released in the market multiple Anti-thunderstrike camera, for example only the single video signal circuit has been done the video lightning protection device of protection, perhaps to the two-in-one lightning of power supply, vision signal circuit, pair power supply has been arranged also, vision signal, the three-in-one lightning arrester of 485 control circuits.But due on the vision signal circuit, the junction capacitance of element is crossed conference and is had influence on vision signal, therefore most products in rear class with a semiconductor discharge tube clamper, its shortcoming is that common mode (to the earth) residual voltage is too high, make a large amount of electric charges directly leak into the earth, cause video line easily to damage.And also can make between line residual voltage higher because electric charge can't directly leak into the earth, protected end chip is easily damaged.The product that also has is done the common mode protection in the video line rear class, respectively the earth is added clamper tube (Transient Suppression Diode TVS or semiconductor discharge tube TSS) in rear class, although can make like this common mode residual voltage, the differential mode residual voltage is on the low side, but have hidden danger, there is interference the large ground that for example connects, this interference meeting moves back on video line through clamper tube from the earth, causes image that the phenomenons such as ripple, decorative pattern, distortion are arranged; If thunderbolt is got on the earth circuit that connects, also have the hidden danger that thunderbolt voltage is played a reversed role.
Therefore, how providing the higher three-in-one lightning arrester that is used for video monitoring system of a kind of security performance is the technical problem that needs to be resolved hurrily in the industry.
The utility model content
The utility model has proposed a kind of three-in-one lightning arrester for video monitoring system in order to address the above problem, and comprises protected video signal circuit, RS485 control protection electric circuit and power protecting circuit; Described protected video signal circuit comprises first order signal protection circuit and second level signal protection circuit; Described RS485 control protection electric circuit comprises first order control protection electric circuit and second level control protection electric circuit; Described power protecting circuit comprises first order power protecting circuit and second level power protecting circuit.
In the present embodiment, described first order signal protection circuit comprises ceramic gas discharge tube G1, G2, resettable fuse P1, P2, and second level signal protection circuit comprises fast reaction diode D1, D2, D3, D4, D5, D6, Transient Suppression Diode T1; Described first order control protection electric circuit comprises ceramic gas discharge tube G3, G4, resettable fuse P3, P4, and second level control protection electric circuit comprises Transient Suppression Diode T2, T3, T4; Described first order power protecting circuit comprises piezo-resistance M1 and ceramic gas discharge tube G5, and second level power protecting circuit comprises piezo-resistance M2, M3, M4, M5, M6, ceramic gas discharge tube G6, G7, magnetic core inductance L 1, L2.
The utility model adopts the secondary circuit protection, and carries out simultaneously the protections of common mode and differential mode, makes the residue residual voltage after surge impact can be lower; The Transient Suppression Diode fast reaction diode of having connected in the signal protection circuit makes between its line the appearance value lower, and the impact of vision signal integrality is reduced to minimum.Response speed of the present utility model is exceedingly fast, and the Transient Suppression Diode of the second level can be made a response in 1ps, and voltage is reduced rapidly; The utility model is series at protected front equipment end, and it is extremely convenient to install, and can work under different operating supply voltages, effectively stops the damage of the rear end equipment that causes because transient voltage is excessive.
Description of drawings
Below in conjunction with drawings and Examples, the utility model is described further, wherein:
Fig. 1 is structural representation of the present utility model.
Embodiment
As shown in Figure 1; the three-in-one lightning arrester that is used for video monitoring system that the utility model one preferred embodiment proposes; formed by protected video signal circuit, RS485 control protection electric circuit and three parts of power protecting circuit, and each circuit is provided with first, second grade protective circuit.
In the protected video signal circuit; ceramic gas discharge tube G1, G2, resettable fuse P1, P2 consist of first order signal protection circuit; the end of G1, P1 and G2, P2 connects respectively signal port, and another termination fast reaction diode D2 of G1, G2 also connects G7, then ground connection.The effect of G1, G2 is that the induction thunder is leaked into the earth PE; the other end of resettable fuse P1, P2 meets respectively fast reaction diode D1, D4 and D3, D6; fast reaction diode D1, D2, D3 connect with Transient Suppression Diode T1 with D4, D5, D6; D1, D4 and D3, D6 connect respectively signal port, and fast reaction diode D1, D2, D3, D4, D5, D6, Transient Suppression Diode T1 consist of second level signal protection circuit.Therefore the advantage of G1, G2 is that transient power is large, and is high but shortcoming is residual voltage, meets P1, P2 not only can play the effect of current limliting, the effect that the resistance in 3-5 Europe that can also be by P1, P2 plays a buffering, delays time.Also fast than the reaction time of G1, G2 because of the reaction time of second level signal protection circuit simultaneously, but transient power is little, so the cushioning effect of P1, P2 is very important.In the signal protection circuit of the second level, D1, T1, D6 and D4, T1, D3 have played the effect of differential mode (between line) protection; D1, T1, D5 and D4, T1, D2 are the common mode protective effects of a circuit a1, and D3, T1, D5 and D6, T1, D2 are the common mode protective effects of another circuit a2.First order signal protection circuit leaks into the earth with most surge; second level signal protection circuit can be accomplished the residual voltage clamper of common mode, differential mode; can make like this residual voltage lower; and D1, D2, D3 connect with D4, D5, D6 and T1; can also play the effect of falling appearance, faster than semiconductor discharge tube (TSS) on response speed.
In the RS485 control protection electric circuit; ceramic gas discharge tube G3, G4, resettable fuse P3, P4 consist of first order control protection electric circuit; G4 and the T2 one indirect P3 of end; and connect respectively the end of control port, T4; another termination of G4 and T2 G3, T3 also meet ceramic gas discharge tube G7; then ground connection; the indirect P4 of the other end of G3, T3; and connect respectively the other end of control port, Transient Suppression Diode T4, wherein Transient Suppression Diode T2, T3, T4 consist of second level control protection electric circuit.Traditional circuit is to be connected on the position of the utility model P3, P4 less than the resistance in 10 Europe with 2W, but according to market reaction, RS485 often has the phenomenon of misconnection civil power, and P3 of the present utility model, P4 can address this problem well, the rear class of P3, P4 is Transient Suppression Diode TVS, and the operation voltage of TVS pipe is at 12V.When the civil power access, TVS pipe actuating circuit electric current in several psecs increases suddenly, and the internal resistance meeting of resettable fuse PTC increases rapidly, thereby may reach the effect of protection rear end.Better than resistance to the inhibition of surge according to many experiments proof PTC in addition, transient power is also large than conventional resistance.
in power protecting circuit, first order power protecting circuit comprises piezo-resistance M1, ceramic gas discharge tube G5, piezo-resistance M1 and ceramic gas discharge tube G5 series connection power port, the indirect magnetic core inductance L 1 of end of piezo-resistance M2 and M4, and meet respectively piezo-resistance M1, M6, another termination piezo-resistance M3 of piezo-resistance M2 and M4 and M5 also meet ceramic gas discharge tube G7, ceramic gas discharge tube G7 ground connection, the indirect magnetic core inductance L 2 of the other end of piezo-resistance M3 and M5, and meet respectively ceramic gas discharge tube G5 and piezo-resistance M6, the two termination power ports of piezo-resistance M6, wherein, M2, M3, M4, M5, M6, G6, G7, L1, L2 consists of second level power protecting circuit.M1, G5 series connection can make leakage current reduce, and the life-span of piezo-resistance improves, and consists of first differential mode (between line) protection.M2, M3, G6 consist of common mode (to the earth) protection, and L1, L2 are the effects of playing buffering, time-delay.M4, M5 be common mode to the earth clamper, M6 is clamper between differential mode line, can make like this residual voltage lower, better protects the rear end.
In order to prevent from disturbing from the earth problem of playing a reversed role, all meet G7 before all protective circuit ground connection, G7 is the tie that the utility model is connected with the earth.Ceramic gas discharge tube is the device of switching mode, and under normal condition, G7 is open a way (1 megaohm), so the problem of playing a reversed role can not occur disturbing.When the induction radar being arranged in circuit after the threshold values of G7, G7 can forward the state of a closure to, and its maximum transient state through-current capacity can reach 10KA, until voltage just can disconnect lower than its open circuit threshold values, so solved well the earth problem of playing a reversed role.
Of the present utility modelly install and use also conveniently especially, as long as the utility model is series at the front end of protected equipment, just can reaches and prevent from responding to thunder from the purpose of transmission line and shell intrusion.
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 (4)
1. a three-in-one lightning arrester that is used for video monitoring system, is characterized in that, comprises protected video signal circuit, RS485 control protection electric circuit and power protecting circuit;
Described protected video signal circuit comprises first order signal protection circuit and second level signal protection circuit; Described RS485 control protection electric circuit comprises first order control protection electric circuit and second level control protection electric circuit; Described power protecting circuit comprises first order power protecting circuit and second level power protecting circuit.
2. the three-in-one lightning arrester for video monitoring system as claimed in claim 1, it is characterized in that, described first order signal protection circuit comprises ceramic gas discharge tube G1, G2, resettable fuse P1, P2, second level signal protection circuit comprises fast reaction diode D1, D2, D3, D4, D5, D6, Transient Suppression Diode T1, signal port meets respectively G1, P1 and G2, the end of P2, ceramic gas discharge tube G1, another termination fast reaction diode D2 of G2 also meets ceramic gas discharge tube G7, resettable fuse P1, the other end of resettable fuse P2 meets respectively fast reaction diode D1, D4 and D3, D6, fast reaction diode D1, D2, D3 and D4, D5, D6 connects with Transient Suppression Diode T1, D1, D4 and D3, D6 connects respectively signal port.
3. the three-in-one lightning arrester for video monitoring system as claimed in claim 1, it is characterized in that, described first order control protection electric circuit comprises ceramic gas discharge tube G3, G4, resettable fuse P3, P4, second level control protection electric circuit comprises Transient Suppression Diode T2, T3, T4, wherein ceramic gas discharge tube G4 and the Transient Suppression Diode T2 one indirect P3 of end, and connect respectively control port, the end of Transient Suppression Diode T4, another termination ceramic gas discharge tube of ceramic gas discharge tube G4 and Transient Suppression Diode T2 G3, Transient Suppression Diode T3 also meets ceramic gas discharge tube G7, ceramic gas discharge tube G3, the indirect resettable fuse P4 of the other end of Transient Suppression Diode T3, and connect respectively control port, the other end of Transient Suppression Diode T4.
4. the three-in-one lightning arrester for video monitoring system as claimed in claim 1, it is characterized in that, described first order power protecting circuit comprises piezo-resistance M1 and ceramic gas discharge tube G5, second level power protecting circuit comprises piezo-resistance M2, M3, M4, M5, M6, ceramic gas discharge tube G6, G7, magnetic core inductance L 1, L2, piezo-resistance M1 and ceramic gas discharge tube G5 series connection power port, the indirect magnetic core inductance L 1 of end of piezo-resistance M2 and M4, and meet respectively piezo-resistance M1, M6, another termination piezo-resistance M3 of piezo-resistance M2 and M4 and M5 also meet ceramic gas discharge tube G7, ceramic gas discharge tube G7 ground connection, the indirect magnetic core inductance L 2 of the other end of piezo-resistance M3 and M5, and meet respectively ceramic gas discharge tube G5 and piezo-resistance M6, the two termination power ports of piezo-resistance M6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320137872 CN203278216U (en) | 2013-03-25 | 2013-03-25 | Three-in-one lightning arrester used in video monitoring system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320137872 CN203278216U (en) | 2013-03-25 | 2013-03-25 | Three-in-one lightning arrester used in video monitoring system |
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| Publication Number | Publication Date |
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| CN203278216U true CN203278216U (en) | 2013-11-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201320137872 Expired - Fee Related CN203278216U (en) | 2013-03-25 | 2013-03-25 | Three-in-one lightning arrester used in video monitoring system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104134986A (en) * | 2014-08-14 | 2014-11-05 | 刘雨佳 | Two-way dual-mode 485 communication lightning protector |
| CN106300315A (en) * | 2016-11-07 | 2017-01-04 | 广西大学 | A kind of single phase poaer supply anti-error wiring lightning protection device |
| WO2017029404A1 (en) * | 2015-08-20 | 2017-02-23 | Zitt Innovation | A surge arrester for a domestic robot assembly |
-
2013
- 2013-03-25 CN CN 201320137872 patent/CN203278216U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104134986A (en) * | 2014-08-14 | 2014-11-05 | 刘雨佳 | Two-way dual-mode 485 communication lightning protector |
| WO2017029404A1 (en) * | 2015-08-20 | 2017-02-23 | Zitt Innovation | A surge arrester for a domestic robot assembly |
| CN106300315A (en) * | 2016-11-07 | 2017-01-04 | 广西大学 | A kind of single phase poaer supply anti-error wiring lightning protection device |
| CN106300315B (en) * | 2016-11-07 | 2018-10-16 | 深圳市科华电源技术有限公司 | A kind of anti-error wiring lightning protection device of single phase poaer supply |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131106 Termination date: 20180325 |