CN100407538C - Lightning protection device for video frequency monitoring equipment - Google Patents
Lightning protection device for video frequency monitoring equipment Download PDFInfo
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- CN100407538C CN100407538C CN2005100114198A CN200510011419A CN100407538C CN 100407538 C CN100407538 C CN 100407538C CN 2005100114198 A CN2005100114198 A CN 2005100114198A CN 200510011419 A CN200510011419 A CN 200510011419A CN 100407538 C CN100407538 C CN 100407538C
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Abstract
The present invention belongs to the field of lightning protection equipment, which particularly relates to a lightning protection device of video frequency monitoring equipment, and the lightning protection device can restrain the impact of lightning and surge voltage from video frequency signal cables for back-end video frequency monitoring equipment. The lightning protection device of the video monitoring equipment comprises a low pass filtering part for restraining high-frequency surge voltage, a voltage absorption part for restraining high-frequency surge voltage, a video frequency compensating and amplifying part and a voltage position-embedded circuit, wherein the input end of the voltage absorption part is connected with the input end of the low pass filtering part, the output end of the low pass filtering part is connected with the input end of the voltage position-embedded circuit by a protective resistor, and the input end of the voltage position-embedded circuit is connected with the input end of the video frequency compensating and amplifying part by an isolating resistor. In addition, the present invention is also provided with a data line lightning protection part which comprises an optoelectronic isolating part, a drive part and a voltage position-embedded circuit, wherein the output end of the optoelectronic isolating part is connected with the input end of the drive part, and the output end of the drive part is connected with the input end of the voltage position-embedded circuit.
Description
Technical field
The invention belongs to the thunder resisting equipment field, the lightning protection device for video frequency monitoring equipment that particularly a kind of energy inhibition is impacted the video monitoring rear end equipment from video signal cable thunder and lightning, surge voltage.
Background technology
As everyone knows, thunder and lightning has great destructiveness, and its voltage is up to millions of volts, and immediate current can be up to hundreds thousand of amperes.The destructive consequence that caused of thunderbolt is embodied in following three kinds of levels: 1. device damage, casualties; 2. equipment or components and parts life-span reduce; 3. signal, the data (analog or digital) of transmission or storage are interfered or lose, even make electronic equipment produce misoperation and paralysis temporarily or whole system pause.Along with the continuous development of modern electronic technology, the using and networking of a large amount of sophisticated electronicses, lightning rod but seems powerless to the protection of these electronic equipments.Lightning rod can not stop indirect lightning strike overvoltage, switching overvoltage and lightning surge intrusion overvoltage, and this class overvoltage is the arch-criminal who destroys a large amount of electronic equipments.
At present; at home in the lightning protection product of video monitoring to rear end equipment; exist clamped voltage big; response speed is slow and do not have an electrostatic isolation etc.; the flash-over characteristic that relies on individual elements (as gas discharge tube) fully comes equipment is protected, because the control electrostatic capacity difference of element or nonideal voltage protective characteristic cause the spike residual voltage that the video processing equipment of rear end (as the video monitoring matrix etc.) is damaged.
Summary of the invention
The object of the present invention is to provide a kind of have lightning protection, isolation features, can thoroughly eliminate the lightning protection device for video frequency monitoring equipment isolated the spike residual voltage with static.
The object of the present invention is achieved like this: lightning protection device for video frequency monitoring equipment, it comprises: be used to suppress the high frequency surge voltage the low-pass filtering part, be used to suppress voltage absorption portion, video comfort amplifier section and the voltage clamping circuit of high frequency surge voltage; The input of the input of described voltage absorption portion and low-pass filtering part joins; Described low-pass filtering part output joins through the input of protective resistance and voltage clamping circuit; The input of described voltage clamping circuit joins through the input of isolation resistance and video comfort amplifier section.
The present invention also can be furnished with the data line lightning arresting part on the basis of said structure; Described data line lightning arresting partly comprises: photoelectricity isolated part, drive part, voltage clamping circuit; Described photoelectricity isolated part output termination drive part input; The input of described drive part output termination voltage clamping circuit.
As a kind of preferred version, the present invention also is furnished with signal sampling part, signal display part; The output of the input termination video comfort amplifier section of described signal sampling part; The input of the output termination signal display part of described signal sampling part.Certainly, the present invention also can be furnished with detecting circuit between signal sampling part and signal display part.
The present invention can suppress from the impact to rear end equipment of the thunder and lightning of video signal cable and Data Control circuit, surge voltage, and signal is realized isolating, and static discharge is had good buffer action.On circuit design,, adopted effective inhibition and isolation, can thoroughly eliminate effectively isolated with static the spike residual voltage at the situation of the non-ideal characteristic and the static discharge of device.
Description of drawings
The invention will be further described below in conjunction with the described execution mode of accompanying drawing.
Fig. 1 is a schematic block circuit diagram of the present invention;
Fig. 2 is single channel lightning protection of first passage vision signal and signal indicating circuit schematic diagram;
Fig. 3 isolates and the protective circuit schematic diagram for RS-485 control of the present invention;
Embodiment
As shown in Figure 1, the present invention includes: be used to suppress the high frequency surge voltage the low-pass filtering part, be used to suppress voltage absorption portion, video comfort amplifier section and the voltage clamping circuit of high frequency surge voltage; The input of the input of voltage absorption portion and low-pass filtering part joins; Low-pass filtering part output joins through the input of protective resistance and voltage clamping circuit; The input of voltage clamping circuit joins through the input of isolation resistance and video comfort amplifier section, and the output of described voltage absorption portion and the output of voltage clamping circuit be ground connection respectively.The present invention also is furnished with the data line lightning arresting part except that containing vision signal single channel lightning protection part; Data line lightning arresting partly comprises: photoelectricity isolated part, drive part, voltage clamping circuit; Photoelectricity isolated part output termination drive part input; The input of drive part output termination voltage clamping circuit.In configurable signal sampling part of the output of video comfort amplifier section and signal display part; Between signal sampling part and signal display part, also is furnished with detecting circuit.
The realization of circuit of the present invention is by powerful voltage absorption circuit most surge voltage to be absorbed earlier, the surge residual voltage that suppresses high frequency then by low-pass filtering, second absorption circuit is made up of transient state suppressing pipe and high speed diode, be mainly used in the absorption of residual voltage, by high-power resistance current limliting and protection, select the vision signal and the isolation that the insensitive CMOS video amplifier of static are come compensate for attenuation then for use; The signal indication is to show by rear drive GLED is amplified in the sampling of output end signal; As shown in Figure 2, AR1 is 75 ohm of build-out resistors, TZ1 is the high-power gas charging pipe, L1 is the low-pass filtering inductance, AC1 is a capacitance, BR1 is the current limliting protective resistance, and high speed diode AD1, BD1, CD1, DD1 and transient state suppressing pipe are formed clamped absorption circuit, and resistance CR1, DR1, ER1, FR1 and U1-A, U1-B form high-barrier from amplifying compensating circuit with video; Sampling capacitance CC1 and resistance GR1, HR1 and U1-D form signal sample circuit, form detecting circuit with U1-F and ED1, drive GLED1 by Q102, and all the other 15 channel circuits are identical; As shown in Figure 3, IN1, IN2 are the input of first via equipment RS-485 control, light mat OC1 photoelectricity is isolated, form corresponding OUT1 of differential drive circuit and the output of OUT2 end from Q1, Q2, Q3, Q4 and peripheral resistance, transient state suppressing pipe R485Z1, R485Z2, R485Z3 and R485D1, R485D2, R485D3, R485D4 high speed diode are formed the lightning protection circuit of output; The second road RS-485 protection output circuit principle is identical.The present invention can realize that the RS-485 control signal lightning protection of 16 tunnel vision signal lightning protection and isolation and 2 tunnel and photoelectricity isolates.In addition, the present invention also has the function of 16 tunnel vision signal states indication, at the situation of the non-ideal characteristic and the static discharge of device, the present invention has adopted effective inhibition and isolation on circuit design, can thoroughly eliminate effectively isolated with static to the spike residual voltage.
Claims (4)
1. lightning protection device for video frequency monitoring equipment, comprise: the low-pass filtering part that is used to suppress the high frequency surge voltage, be used to suppress the voltage absorption portion of high frequency surge voltage, it is characterized in that this lightning protection device also comprises video comfort amplifier section that is made of the CMOS video amplifier and the voltage clamping circuit of being made up of transient state suppressing pipe and high speed diode; The input of the input of described voltage absorption portion and low-pass filtering part joins, described low-pass filtering part output joins through the input of protective resistance and voltage clamping circuit, and the input of described voltage clamping circuit joins through the input of isolation resistance and video comfort amplifier section; The vision signal that wherein contains the high frequency surge voltage is absorbed after most of surge voltage by the voltage absorption portion earlier, suppresses the surge residual voltage of high frequency again by low pass filter; Absorb residual voltage by voltage clamp circuit then, at last by the assign to vision signal of compensate for attenuation of video comfort enlarging section.
2. lightning protection device for video frequency monitoring equipment according to claim 1 is characterized in that: also be furnished with the data line lightning arresting part; Described data line lightning arresting partly comprises: photoelectricity isolated part, drive part, lightning protection circuit; Described photoelectricity isolated part output termination drive part input, described drive part output is taken over control the input of thunder protective circuit; The multi-channel video signal that wherein contains thunder and lightning, surge voltage is input to the photoelectricity isolated part, through overdrive circuit the vision signal after having isolated the thunder and lightning signal is input to the lightning protection part again, and lightning protection partially absorbs remaining surge voltage then.
3. lightning protection device for video frequency monitoring equipment according to claim 1 is characterized in that: also be furnished with signal sampling part, signal display part; The output of the input termination video comfort amplifier section of described signal sampling part; The input of the output termination signal display part of described signal sampling part.
4. lightning protection device for video frequency monitoring equipment according to claim 3 is characterized in that: also be furnished with detecting circuit between signal sampling part and signal display part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2005100114198A CN100407538C (en) | 2005-03-11 | 2005-03-11 | Lightning protection device for video frequency monitoring equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2005100114198A CN100407538C (en) | 2005-03-11 | 2005-03-11 | Lightning protection device for video frequency monitoring equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1674390A CN1674390A (en) | 2005-09-28 |
| CN100407538C true CN100407538C (en) | 2008-07-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2005100114198A Expired - Fee Related CN100407538C (en) | 2005-03-11 | 2005-03-11 | Lightning protection device for video frequency monitoring equipment |
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| CN (1) | CN100407538C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101989330B (en) * | 2009-08-07 | 2013-01-09 | 上海华虹Nec电子有限公司 | High-frequency radio frequency identification device (RFID) tag circuit and chip |
| CN102185304A (en) * | 2011-05-16 | 2011-09-14 | 浙江大华技术股份有限公司 | Surge protection circuit of video input signal |
| CN109193603B (en) * | 2018-10-12 | 2023-08-18 | 柳州辰天科技有限责任公司 | Lightning protection compensator with monitoring function and monitoring method thereof |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2067051U (en) * | 1989-11-25 | 1990-12-05 | 南通电视机厂 | Vidio frequency switchover decoder by tv system |
| US5379177A (en) * | 1992-04-08 | 1995-01-03 | Atlantic Scientific | Transient voltage surge suppressor with I2 R/I2 T overcurrent protection switch |
| CN1276641A (en) * | 1999-06-02 | 2000-12-13 | 尹顿公司 | Surge suppressing circuit capable of responding power disturbance change rate |
| CN2471036Y (en) * | 2001-04-12 | 2002-01-09 | 北京网之路科技有限公司 | Real-time monitoring apparatus for quality of TV signal |
| CN2511032Y (en) * | 2001-10-15 | 2002-09-11 | 海信集团有限公司 | Domestic-appliance lightning-stroke-proof apparatus of mainly preventing from inductive lightning |
| CN2517176Y (en) * | 2002-01-23 | 2002-10-16 | 广东步步高电子工业有限公司 | Load testing protection device for audio-frequency video-frequency amplifier |
| US20040190213A1 (en) * | 2003-03-24 | 2004-09-30 | Kuo-Liang Lin | Compensation circuit for power supply |
| CN1547316A (en) * | 2003-12-15 | 2004-11-17 | 戴春云 | AC-DC brushless motor |
-
2005
- 2005-03-11 CN CN2005100114198A patent/CN100407538C/en not_active Expired - Fee Related
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2067051U (en) * | 1989-11-25 | 1990-12-05 | 南通电视机厂 | Vidio frequency switchover decoder by tv system |
| US5379177A (en) * | 1992-04-08 | 1995-01-03 | Atlantic Scientific | Transient voltage surge suppressor with I2 R/I2 T overcurrent protection switch |
| CN1276641A (en) * | 1999-06-02 | 2000-12-13 | 尹顿公司 | Surge suppressing circuit capable of responding power disturbance change rate |
| CN2471036Y (en) * | 2001-04-12 | 2002-01-09 | 北京网之路科技有限公司 | Real-time monitoring apparatus for quality of TV signal |
| CN2511032Y (en) * | 2001-10-15 | 2002-09-11 | 海信集团有限公司 | Domestic-appliance lightning-stroke-proof apparatus of mainly preventing from inductive lightning |
| CN2517176Y (en) * | 2002-01-23 | 2002-10-16 | 广东步步高电子工业有限公司 | Load testing protection device for audio-frequency video-frequency amplifier |
| US20040190213A1 (en) * | 2003-03-24 | 2004-09-30 | Kuo-Liang Lin | Compensation circuit for power supply |
| CN1547316A (en) * | 2003-12-15 | 2004-11-17 | 戴春云 | AC-DC brushless motor |
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| Publication number | Publication date |
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| CN1674390A (en) | 2005-09-28 |
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Owner name: GUANGDONG ZHONGYU TECHNOLOGY CO., LTD. Free format text: FORMER NAME: ZHONGYU SCIENCE + TECHNOLOGY CO., LTD., GUANGDONG |
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Address after: 511495 Guangdong city of Guangzhou province Panyu District zhongcunzhen Pingshan Village (office building No. 2) Patentee after: GUANGDONG ZHONGYU TECHNOLOGY CO., LTD. Address before: 510095, Guangzhou, Guangdong province Dongshan District 36-38 gold road, King Building, 11 floor Patentee before: Zhongyu Science & Technology Co., Ltd., Guangdong |
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