CN203193267U - Video lightning protection device and video monitoring system - Google Patents

Video lightning protection device and video monitoring system Download PDF

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Publication number
CN203193267U
CN203193267U CN 201320055675 CN201320055675U CN203193267U CN 203193267 U CN203193267 U CN 203193267U CN 201320055675 CN201320055675 CN 201320055675 CN 201320055675 U CN201320055675 U CN 201320055675U CN 203193267 U CN203193267 U CN 203193267U
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CN
China
Prior art keywords
video
isolating transformer
coil
primary coil
isolation transformer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CN 201320055675
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Chinese (zh)
Inventor
吴洪进
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SHENZHEN HONGDI INDUSTRIAL Co Ltd
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SHENZHEN HONGDI INDUSTRIAL Co Ltd
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Publication date
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Priority to CN 201320055675 priority Critical patent/CN203193267U/en
Application granted granted Critical
Publication of CN203193267U publication Critical patent/CN203193267U/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Abstract

The utility model provides a video lightning protection device and a video monitoring system. An isolation transformer is connected between video transmission cables and a protected device. The video transmission cables are connected with a primary coil of the isolation transformer. The primary coil of the isolation transformer is connected with ground through a surge protector. A secondary coil of the isolation transformer is connected with the protected device. The primary coil of the isolation transformer is connected with the secondary coil of the isolation transformer through a magnetic core. Through the isolation transformer, the video transmission cables are isolated with the protected device. High voltage generated by lightning stroke is reduced and strong current generated by lightning stroke is bled, so that the isolation transformer and the protected device are protected from damage by strong current and high voltage of lightning. The device and the system have good impedance matching characteristics, can perform effective protection on frequency-modulated video signals, and prevents transmitted video signals from being absorbed.

Description

A kind of video lightning protection device and video monitoring system
Technical field
The utility model belongs to safety-security area, relates in particular to a kind of video link checkout gear and video monitoring apparatus.
Background technology
Along with the progress of society, the improving constantly of living standards of the people, social economy gets over active, and is more and more higher to the demand of " safety ", and safety defense monitoring system has obtained popularization and application more widely.Application in all trades and professions such as highway, financial sector, military unit, traffic monitoring, important place, various residential quarter, public place, store management is more and more general.Simultaneously, the fail safe of safety defense monitoring system self also becomes new a, important problem.
Modern safety monitoring product all is the microelectronics technology product, and these watch-dogs have characteristics such as high density, high-speed, low-voltage and low-power consumption.It is to various very responsive such as electromagnetic interference such as lightning overvoltage, power system operation overvoltage, static discharge, electromagnetic radiation, this just makes supervisory control system equipment destroyed by thunderbolt/overvoltage, its consequence may make whole monitoring system operation malfunctioning, and causes the economic loss that is difficult to estimate and the risk of secure context.
Be existing a kind of lightning protection circuit structural representation as Fig. 1; be in series with the current limliting assembly at cable and protected equipment room; an end that links to each other with cable at the current limliting assembly is connected with the earial drainage assembly; an end that links to each other with protected equipment at the current limliting assembly is connected with the clamp assembly, and described earial drainage assembly, clamp assembly all join with ground.After cable is struck by lightning; can be discharged by the big electric current of earial drainage assembly to thunderbolt; the big electric current of thunderbolt is connect earial drainage; and by the current limliting assembly circuit is further protected; when electric current is excessive, then remain and open circuit; prevent that big electric current from entering into protected equipment; the clamp assembly then can be subjected to high-tension impact to protected equipment; after voltage surpasses certain value; the clamp assembly namely becomes channel status; high voltage can be dragged down fast; thereby effectively protect equipment, but in the video line transmission, often need specific impedance matching; could guarantee the effective power maximum of transmission; particularly in the high-frequency signal transmission circuit, as the HD-SDI vision signal, its transmission rate can reach 1.485G; employed earial drainage assembly makes the vision signal of high frequency be absorbed by the big electric capacity of earial drainage assembly easily in the prior art, thereby causes losing of signal.
The utility model content
Lightning protection device and video monitoring system that the purpose of this utility model is to provide a kind of energy to be used for the transmission of high-speed video signal, impedance does not match and produces the problem that loss and high-frequency signal are absorbed loss easily when solving transmission video signal in the prior art.
The utility model is to realize like this; a kind of video lightning protection device; the isolating transformer that is connected with protected equipment room at the video transmission line cable; described video transmission line cable connects the primary coil of isolating transformer; the primary coil of described isolating transformer links to each other with ground by Surge Protector; the secondary coil of described isolating transformer connects protected equipment, and the primary coil of described isolating transformer links to each other by magnetic core with the secondary coil of isolating transformer.
Preferably, the magnetic core of described isolating transformer is FERRITE CORE.
Preferably, the coil of the primary coil of described isolating transformer and secondary coil is the thin wire of multiply mutually insulated.
Further preferred, the primary coil of described isolating transformer and the coil surface of secondary coil have Gold plated Layer.
The utility model also provides a kind of video monitoring system, and described system comprises video lightning protection device described above.
In the utility model; by isolating transformer video transmission line cable and protected equipment are isolated; the vision signal of high frequency can transfer to secondary coil by the primary coil of isolating transformer to protected equipment; high pressure and heavy current by the thunderbolt generation; then can carry out step-down and the heavy current of releasing by Surge Protector; protection isolating transformer and protected equipment are avoided heavy current and the high-tension damage of thunder and lightning; compare with prior art; it has good impedance matching property; can effectively protect the vision signal of frequency modulation, the vision signal of avoiding transmitting is absorbed.
Magnetic core by the selection isolating transformer is FERRITE CORE, can improve the conduction efficiency of coil, thereby effectively reduce the number of turns of coil winding, when the isolating transformer volume and weight is reduced, also can reduce cost.
And the primary coil of described isolating transformer and secondary coil are set to the thin wire of multiply mutually insulated, can the better utilization high-frequency signal the principle of skin effect during transmission, utilize many thin wires to improve the efficiency of transmission of signal, than the mode of using a lead, because the efficiency of transmission of the inside of lead is low, therefore, when its efficiency of transmission is higher, also can save the lead cost.
In addition, the primary coil of described isolating transformer and the coil surface of secondary coil have Gold plated Layer, and its purpose is better primary coil and secondary coil to be isolated, thereby more reliable digital isolation performance is provided.
Description of drawings
Fig. 1 is this video lightning protection device electrical block diagram of the prior art;
Fig. 2 is the structural representation of the video lightning protection device that provides of the utility model embodiment;
The schematic diagram of the coil of the isolating transformer that Fig. 3 provides for the utility model embodiment.
Embodiment
In order to make the purpose of this utility model, technical scheme and beneficial effect clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explaining the utility model, and be not used in restriction the utility model.
Inventive principle of the present utility model is the impedance matching requirement when utilizing the adjustable principle of transformer impedance to come the adaptive video signal to transmit; to adapt to the requirement of high efficiency signal transmission; avoid using big electric capacity to carry out current absorption; can be effectively protected to vision signal, prevent absorption loss.
As shown in Figure 2; video lightning protection device described in the utility model; the isolating transformer that is connected with protected equipment room at the video transmission line cable; described video transmission line cable connects the primary coil of isolating transformer; the primary coil of described isolating transformer links to each other with ground by Surge Protector; the secondary coil of described isolating transformer connects protected equipment, and the primary coil of described isolating transformer links to each other by magnetic core with the secondary coil of isolating transformer.
Described video transmission line cable generally refers to be in the cable of outdoor transmission video signal, and it can be coaxial cable, also can be twisted-pair feeder.Described protected equipment; comprise the video camera of front end and the video monitoring equipment on backstage; because under outdoor scene; the video transmission line cable conducts thunder and lightning easily, so at the interface of video transmission line cable and front-end camera and background monitoring equipment, all need the equipment lightning protection device; lightning protection device described in the utility model namely is arranged at above-mentioned position; can said elements be encapsulated by protecting sheathing, at the protecting sheathing table joint is set, install with convenient.
In the transmission of video signals conversion, because the frequency of vision signal is generally tens or up to a hundred million, for the HD-SDI signal, its transmission speed is 1.485Gbps, therefore, need to select the isolating transformer of high frequency to carry out the transmission conversion of signal, as shown in Figure 3, the primary coil of described isolating transformer and secondary coil are set to the thin wire 1 of multiply mutually insulated.Can the better utilization high-frequency signal the principle of skin effect during transmission, when using a lead transmission, owing to skin effect, the signal of telecommunication of transmission is on the surface of lead, and use multiple conducting wires, just can obviously improve the surface area of lead, thereby improve efficiency of transmission.Thereby utilize many thin wires, can obviously improve the efficiency of transmission of signal, than the mode of using a lead, because the efficiency of transmission of the inside of lead is low, therefore, when its efficiency of transmission is higher, also can save the lead cost.In addition, from saving cost, also can select the hollow conductor transmission for use.
In addition, the primary coil of described isolating transformer and the coil surface of secondary coil have Gold plated Layer 2, and its purpose is better primary coil and secondary coil to be isolated, thereby more reliable digital isolation performance is provided, and improve the reliability of signal transmission.
Magnetic core by the selection isolating transformer is FERRITE CORE, can improve the conduction efficiency of coil, thereby effectively reduce the number of turns of coil winding, when the isolating transformer volume and weight is reduced, also can reduce cost.
The utility model is isolated video transmission line cable and protected equipment by isolating transformer; the vision signal of high frequency can transfer to secondary coil by the primary coil of isolating transformer to protected equipment; high pressure and heavy current by the thunderbolt generation; then can carry out step-down and the heavy current of releasing by Surge Protector; protection isolating transformer and protected equipment are avoided heavy current and the high-tension damage of thunder and lightning; compare with prior art; it has good impedance matching property; can effectively protect the vision signal of frequency modulation, the vision signal of avoiding transmitting is absorbed.
The above only is preferred embodiment of the present utility model; not in order to limit the utility model; all any modifications of within spirit of the present utility model and principle, doing, be equal to and replace and improvement etc., all should be included within the protection range of the present utility model.

Claims (5)

1. video lightning protection device; it is characterized in that; the isolating transformer that is connected with protected equipment room at the video transmission line cable; described video transmission line cable connects the primary coil of isolating transformer; the primary coil of described isolating transformer links to each other with ground by Surge Protector; the secondary coil of described isolating transformer connects protected equipment, and the primary coil of described isolating transformer links to each other by magnetic core with the secondary coil of isolating transformer.
2. video lightning protection device according to claim 1 is characterized in that, the magnetic core of described isolating transformer is FERRITE CORE.
3. video lightning protection device according to claim 1 is characterized in that, the primary coil of described isolating transformer and the coil of secondary coil are the thin wire of multiply mutually insulated.
4. video lightning protection device according to claim 1 is characterized in that, the primary coil of described isolating transformer and the coil surface of secondary coil have Gold plated Layer.
5. a video monitoring system is characterized in that, described system comprises each described video lightning protection device of aforesaid right requirement 1-4.
CN 201320055675 2013-01-31 2013-01-31 Video lightning protection device and video monitoring system Expired - Fee Related CN203193267U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 201320055675 CN203193267U (en) 2013-01-31 2013-01-31 Video lightning protection device and video monitoring system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 201320055675 CN203193267U (en) 2013-01-31 2013-01-31 Video lightning protection device and video monitoring system

Publications (1)

Publication Number Publication Date
CN203193267U true CN203193267U (en) 2013-09-11

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN 201320055675 Expired - Fee Related CN203193267U (en) 2013-01-31 2013-01-31 Video lightning protection device and video monitoring system

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CN (1) CN203193267U (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107079202A (en) * 2014-08-29 2017-08-18 恩德斯+豪斯流量技术股份有限公司 Intrinsically safe circuit with impedance matching
CN113572146A (en) * 2021-07-27 2021-10-29 四川鑫星源科技有限公司 Secondary system strong current intrusion prevention protection device and method thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107079202A (en) * 2014-08-29 2017-08-18 恩德斯+豪斯流量技术股份有限公司 Intrinsically safe circuit with impedance matching
CN113572146A (en) * 2021-07-27 2021-10-29 四川鑫星源科技有限公司 Secondary system strong current intrusion prevention protection device and method thereof

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CF01 Termination of patent right due to non-payment of annual fee