CN203279006U - Network camera with Ethernet interface lightning protection function - Google Patents
Network camera with Ethernet interface lightning protection function Download PDFInfo
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- CN203279006U CN203279006U CN 201320315982 CN201320315982U CN203279006U CN 203279006 U CN203279006 U CN 203279006U CN 201320315982 CN201320315982 CN 201320315982 CN 201320315982 U CN201320315982 U CN 201320315982U CN 203279006 U CN203279006 U CN 203279006U
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Abstract
The utility model discloses a network camera with an Ethernet interface lightning protection function. The network camera comprises a lens (1), an image sensor (2), a main control chip (31), an automatic aperture drive circuit (32), an automatic focal length drive circuit (33), an automatic zooming drive circuit (34), a clock circuit (35), a watchdog circuit (36), a memory circuit (37) and a network interface (4). The network camera is characterized in that the network interface (4) comprises an Ethernet chip (41), an RJ45 interface (43) and a lightning protection circuit (42) connected between the Ethernet chip (41) and the RJ45 interface (43). By adopting a silicon protection circuit and a gas discharge protection circuit, the network camera can effectively protect the Ethernet interface from being affected by thunder and lightning.
Description
Technical field
The utility model relates to a kind of video camera, specifically a kind of web camera with Ethernet interface lightning protection function.
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 extensively based on the safety-protection system of video monitoring.
Web camera is one of core building block in 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 is processed and main control chip that whole web camera circuit is controlled and be connected respectively to auto iris drive circuit on 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 arranged on outdoor, therefore lightning protection circuit need to 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 subject 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.
The utility model content
The technical problems to be solved in the utility model just is: for the problems referred to above of prior art existence; the utility model provides a kind of web camera with Ethernet interface lightning protection function, its effectively the Ethernet interface of protecting network video camera avoid effects of lightning.
For achieving the above object, web camera with Ethernet interface lightning protection function of the present utility model, 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 to lightning protection circuit between Ethernet chip, RJ45 interface.
As further improvement of the utility model, 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 above-mentioned silicon protection diode circuit, this fast recovery diode positive pole is connected 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 utility model is: when temporary overvoltage is transferred to protective circuit along signal line, and 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 conductings discharge, silicon protection diode is at first breakdown and flow through transient current, and transient current increases gradually, and the pressure drop on 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; After three grades of gas discharge tube discharges, the passage that it provides the bypass of a ground connection to release the large 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.
The beneficial effects of the utility model are: 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 utility model;
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 utility model is described in further detail, but execution mode of the present utility model is not limited only to this.
As Fig. 1, Fig. 2 and shown in Figure 3, the web camera with Ethernet interface lightning protection function of the 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 to lightning protection circuit 42 between Ethernet chip 41, 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 above-mentioned silicon protection diode circuit, above-mentioned fast recovery diode positive pole is connected with silicon protection diode cathode.
Also be in series with current limiting device on 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.
Be only below preferred implementation of the present utility model, protection range of the present utility model also not only is confined to above-described embodiment, and all technical schemes that belongs under the utility model thinking all belong to protection range of the present utility model.Should be pointed out that for those skilled in the art, the some improvements and modifications not breaking away under the utility model principle prerequisite should be considered as protection range of the present utility model.
Claims (6)
1. the web camera that has the Ethernet interface lightning protection function, 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 be connected to Ethernet chip (41), lightning protection circuit (42) between RJ45 interface (43).
2. the web camera with Ethernet interface lightning protection function 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. the web camera with Ethernet interface lightning protection function 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. the web camera with Ethernet interface lightning protection function according to claim 3, is characterized in that, also is in series with fast recovery diode on described silicon protection diode circuit, and described fast recovery diode positive pole is connected with silicon protection diode cathode.
5. according to claim 3 or 4 described web cameras with Ethernet interface lightning protection function, is characterized in that, also is 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. the web camera with Ethernet interface lightning protection function 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 |
|---|---|---|---|
| CN 201320315982 CN203279006U (en) | 2013-06-04 | 2013-06-04 | Network camera with Ethernet interface lightning protection function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320315982 CN203279006U (en) | 2013-06-04 | 2013-06-04 | Network camera with Ethernet interface lightning protection function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203279006U true CN203279006U (en) | 2013-11-06 |
Family
ID=49509324
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320315982 Expired - Lifetime CN203279006U (en) | 2013-06-04 | 2013-06-04 | Network camera with Ethernet interface lightning protection function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203279006U (en) |
-
2013
- 2013-06-04 CN CN 201320315982 patent/CN203279006U/en not_active Expired - Lifetime
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20170904 Address after: 518000, Shenzhen, Guangdong District, Longgang District, Bantian street, 369 dragon road, East China Sea Wang Industrial Zone B building on the third floor Patentee after: SHENZHEN NAIJIE ELECTRONIC TECHNOLOGY Co.,Ltd. Address before: 610000 No. two, No. 1 South Road, Chengdu hi tech Zone, Sichuan, China Patentee before: SICHUAN AIPSTAR DIGITAL TECHNOLOGY Co.,Ltd. |
|
| TR01 | Transfer of patent right | ||
| CX01 | Expiry of patent term |
Granted publication date: 20131106 |
|
| CX01 | Expiry of patent term |