CN103297700A - Lightening-preventing web camera - Google Patents
Lightening-preventing web camera Download PDFInfo
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- CN103297700A CN103297700A CN2013102174802A CN201310217480A CN103297700A CN 103297700 A CN103297700 A CN 103297700A CN 2013102174802 A CN2013102174802 A CN 2013102174802A CN 201310217480 A CN201310217480 A CN 201310217480A CN 103297700 A CN103297700 A CN 103297700A
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- lightning protection
- web camera
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Abstract
The invention discloses a lightening-preventing web camera which comprises a camera lens (1), an image sensor (2), a main control chip (31), an automatic diaphragm drive circuit (32), an automatic focal distance drive circuit (33), an automatic zoom drive circuit (34), a clock circuit (35), a watchdog circuit (36), a memory circuit (37) and an Internet interface (4). The lightening-preventing web camera is characterized in that the Internet interface (4) comprises an Ethernet chip (41), an RJ45 interface (43), and a lightening-preventing circuit (42) connected between the Ethernet chip (41) and the RJ45 interface (43). By a silicon protection circuit and a gas discharge protection circuit, the Ethernet interface of the web camera is effectively protected from being influenced by lightening.
Description
Technical field
The present invention relates to a kind of video camera, specifically is a kind of lightning protection web camera.
Background technology
Video monitoring can be in real time, image, the state of reaction monitoring object truly, is convenient to storage, can improve the efficiency of management and automatization level.Along with the raising of people's awareness of safety, be employed more and more widely based on the safety-protection system of video monitoring.
Web camera is one of core building block in the video monitoring system, and existing web camera generally comprises camera lens, filter, be used for receiving the light signal of camera lens collection and light signal is converted to signal of telecommunication imageing sensor, is used for the view data of the signal of telecommunication handled and main control chip that whole web camera circuit is controlled and be connected respectively to auto iris drive circuit on the main control chip, focal length drive circuit, autozoom drive circuit, clock circuit, watchdog circuit, memory circuitry, power circuit etc. automatically.
At present, in video monitoring system, many web cameras are installed in outdoor, therefore lightning protection circuit need be set.And existing web camera, it generally only is provided with the power lightning protection circuit, but in actual use, Ethernet interface place dielectric strength is generally lower, the ability that stands lightning overvoltage and overcurrent is relatively poor, be easy to be subjected to the infringement of temporary overvoltage, in order to guarantee the normal of web camera communication, must take the lightning protection setting to the video camera Ethernet interface.
Summary of the invention
The technical problem to be solved in the present invention just is: the problems referred to above at prior art exists, the invention provides a kind of lightning protection web camera, its effectively the Ethernet interface of protecting network video camera avoid effects of lightning.
For achieving the above object, lightning protection web camera of the present invention, comprise camera lens, imageing sensor, main control chip, auto iris drive circuit, focal length drive circuit, autozoom drive circuit, clock circuit, watchdog circuit, memory circuitry, network interface automatically, above-mentioned network interface comprises Ethernet chip, RJ45 interface and is connected lightning protection circuit between Ethernet chip, the RJ45 interface.
As a further improvement on the present invention, above-mentioned lightning protection circuit comprise receive differential lines to, send differential lines to the current drain circuit of instantaneous high pressure, wherein receive between the right differential lines of differential lines, send the current drain circuit that all is connected with instantaneous high pressure between the right differential lines of differential lines.
Further, the current drain circuit of above-mentioned instantaneous high pressure comprise be connected in parallel on differential lines between three utmost point gas discharge tubes and two silicon protection diodes; The other end ground connection of three grades of gas discharge tubes; Two silicon protection diode closures are opposite; Wherein, the discharge voltage of three grades of gas discharge tubes can be realized common mode and differential mode overvoltage protection greater than the puncture voltage of your protection diode.
Further, also be in series with fast recovery diode on the above-mentioned silicon protection diode circuit, this fast recovery diode positive pole links to each other with silicon protection diode cathode.
Further, also be in series with current limiting device on the differential lines between above-mentioned silicon protection diode circuit and three utmost point gas discharge tube circuit.
Preferably, above-mentioned current limiting device is the resistance in 2.2 Europe, and above-mentioned silicon protection diode is Transient Suppression Diode.
Operation principle of the present invention is: when temporary overvoltage is transferred to protective circuit along signal line, because three grades of gas discharge tubes have higher discharge voltage and long response time, its not discharge of conducting immediately; Before three grades of gas discharge tube conducting discharges, silicon protection diode is at first breakdown and flow through transient current, and transient current increases gradually, and the pressure drop on the current limiting device also responds increase, and this pressure drop puts on three grades of gas discharge tube two ends, impels it to discharge as early as possible; Behind three grades of gas discharge tube discharges, the passage that it provides the bypass of a ground connection to release the big electric current of transient state shows overvoltage simultaneously, thereby current limiting device and your protection diode are played a protective role, further the protecting network interface circuit.
Beneficial effect of the present invention is: adopt silicon protective circuit and gas discharge protection circuit, effectively prevent the damage that transient state differential mode that thunder and lightning causes and common mode overvoltage cause signaling interface, effectively the Ethernet interface of protecting network video camera is avoided effects of lightning.
Description of drawings
Fig. 1 is structural representation of the present invention;
Fig. 2 is the structural representation of lightning protection circuit;
Fig. 3 is the connection diagram of lightning protection circuit and Ethernet chip and RJ45 interface circuit.
Marginal data: 1, camera lens; 2, imageing sensor; 31, main control chip; 32, auto iris drive circuit; 33, automatic focal length drive circuit; 34, autozoom drive circuit; 35, clock circuit; 36, watchdog circuit; 37, memory circuitry; 4, network interface; 41, Ethernet chip; 42, lightning protection circuit; 43, RJ45 interface.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the present invention is described in further detail, but embodiments of the present invention are not limited only to this.
As Fig. 1, Fig. 2 and shown in Figure 3, the lightning protection web camera of present embodiment, comprise camera lens 1, imageing sensor 2, main control chip 31, auto iris drive circuit 32, focal length drive circuit 33, autozoom drive circuit 34, clock circuit 35, watchdog circuit 36, memory circuitry 37, network interface 4 automatically, above-mentioned network interface 4 comprises Ethernet chip 41, RJ45 interface 43 and is connected lightning protection circuit 42 between Ethernet chip 41, the RJ45 interface 43.The connected mode of lightning protection circuit 42 and Ethernet chip 41, RJ45 interface 43 as shown in Figure 3, auto iris drive circuit 32, focal length drive circuit 33, autozoom drive circuit 34, clock circuit 35, watchdog circuit 36, memory circuitry 37 belong to prior art and repeat no more herein automatically.
Above-mentioned lightning protection circuit 42 comprise receive differential lines to, send differential lines to the current drain circuit of instantaneous high pressure, between the right differential lines of above-mentioned reception differential lines, send the current drain circuit that all is connected with instantaneous high pressure between the right differential lines of differential lines.
The current drain circuit of above-mentioned instantaneous high pressure comprise be connected in parallel on differential lines between three utmost point gas discharge tubes and two silicon protection diodes; The other end ground connection of above-mentioned three grades of gas discharge tubes; Above-mentioned two silicon protection diode closure is opposite.
Also be in series with fast recovery diode on the above-mentioned silicon protection diode circuit, above-mentioned fast recovery diode positive pole links to each other with silicon protection diode cathode.
Also be in series with current limiting device on the differential lines between above-mentioned silicon protection diode circuit and three utmost point gas discharge tube circuit.
Above-mentioned current limiting device is the resistance in 2.2 Europe, and above-mentioned silicon protection diode is Transient Suppression Diode.
Below only be preferred implementation of the present invention, protection scope of the present invention also not only is confined to above-described embodiment, and all technical schemes that belongs under the thinking of the present invention all belong to protection scope of the present invention.Should be pointed out that for those skilled in the art the some improvements and modifications not breaking away under the principle of the invention prerequisite should be considered as protection scope of the present invention.
Claims (6)
1. lightning protection web camera, comprise camera lens (1), imageing sensor (2), main control chip (31), auto iris drive circuit (32), automatic focal length drive circuit (33), autozoom drive circuit (34), clock circuit (35), watchdog circuit (36), memory circuitry (37), network interface (4), it is characterized in that described network interface (4) comprises Ethernet chip (41), RJ45 interface (43) and is connected lightning protection circuit (42) between Ethernet chip (41), the RJ45 interface (43).
2. lightning protection web camera according to claim 1, it is characterized in that, described lightning protection circuit (42) comprise receive differential lines to, send differential lines to the current drain circuit of instantaneous high pressure, between the right differential lines of described reception differential lines, send the current drain circuit that all is connected with instantaneous high pressure between the right differential lines of differential lines.
3. lightning protection web camera according to claim 2 is characterized in that, the current drain circuit of described instantaneous high pressure comprise be connected in parallel on differential lines between three utmost point gas discharge tubes and two silicon protection diodes; The other end ground connection of described three grades of gas discharge tubes; Described two silicon protection diode closure is opposite.
4. lightning protection web camera according to claim 3 is characterized in that, also is in series with fast recovery diode on the described silicon protection diode circuit, and described fast recovery diode positive pole links to each other with silicon protection diode cathode.
5. according to claim 3 or 4 described lightning protection web cameras, it is characterized in that, also be in series with current limiting device on the differential lines between described silicon protection diode circuit and three utmost point gas discharge tube circuit.
6. lightning protection web camera according to claim 5 is characterized in that, described current limiting device is the resistance in 2.2 Europe, and described silicon protection diode is Transient Suppression Diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013102174802A CN103297700A (en) | 2013-06-04 | 2013-06-04 | Lightening-preventing web camera |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013102174802A CN103297700A (en) | 2013-06-04 | 2013-06-04 | Lightening-preventing web camera |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103297700A true CN103297700A (en) | 2013-09-11 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013102174802A Pending CN103297700A (en) | 2013-06-04 | 2013-06-04 | Lightening-preventing web camera |
Country Status (1)
| Country | Link |
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| CN (1) | CN103297700A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103997594A (en) * | 2014-05-09 | 2014-08-20 | 广西南宁百兰斯科技开发有限公司 | Camera with lightning protection system |
| CN104779599A (en) * | 2015-05-06 | 2015-07-15 | 上海雷迅防雷技术有限公司 | Multi-functional unattended operation fault detection analysis intermediate equipment |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4758920A (en) * | 1987-03-02 | 1988-07-19 | Oneac Corporation | Telephone and data overvoltage protection apparatus |
| CN1472859A (en) * | 2002-07-30 | 2004-02-04 | 华为技术有限公司 | Lightening arresting method and device for Ethernet port |
| CN1549416A (en) * | 2003-05-10 | 2004-11-24 | 华为技术有限公司 | Thunder proof protective circuit for Ethernet interface |
| CN201766665U (en) * | 2010-06-03 | 2011-03-16 | 吉林市航盛宏宇电子有限公司 | Network camera |
| CN202068179U (en) * | 2011-02-24 | 2011-12-07 | 青岛国华电子有限公司 | Novel network lightning protector |
-
2013
- 2013-06-04 CN CN2013102174802A patent/CN103297700A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4758920A (en) * | 1987-03-02 | 1988-07-19 | Oneac Corporation | Telephone and data overvoltage protection apparatus |
| CN1472859A (en) * | 2002-07-30 | 2004-02-04 | 华为技术有限公司 | Lightening arresting method and device for Ethernet port |
| CN1549416A (en) * | 2003-05-10 | 2004-11-24 | 华为技术有限公司 | Thunder proof protective circuit for Ethernet interface |
| CN201766665U (en) * | 2010-06-03 | 2011-03-16 | 吉林市航盛宏宇电子有限公司 | Network camera |
| CN202068179U (en) * | 2011-02-24 | 2011-12-07 | 青岛国华电子有限公司 | Novel network lightning protector |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103997594A (en) * | 2014-05-09 | 2014-08-20 | 广西南宁百兰斯科技开发有限公司 | Camera with lightning protection system |
| CN104779599A (en) * | 2015-05-06 | 2015-07-15 | 上海雷迅防雷技术有限公司 | Multi-functional unattended operation fault detection analysis intermediate equipment |
| CN104779599B (en) * | 2015-05-06 | 2018-03-30 | 上海雷迅防雷技术有限公司 | Multi-functional unattended fault detection analysis intermediate equipment |
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Application publication date: 20130911 |