CN216253048U - Automobile instrument video protection circuit - Google Patents
Automobile instrument video protection circuit Download PDFInfo
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- CN216253048U CN216253048U CN202122177720.3U CN202122177720U CN216253048U CN 216253048 U CN216253048 U CN 216253048U CN 202122177720 U CN202122177720 U CN 202122177720U CN 216253048 U CN216253048 U CN 216253048U
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Abstract
The automobile instrument video protection circuit comprises a control panel, a display, a connector and a camera, wherein the control panel is connected with the camera after passing through the connector, and the control panel outputs a video signal to the display; the connecting wire between the connector and the camera comprises a power wire (L1), a video signal wire (L2) and a video grounding wire (L3), and a clamping circuit is added to the video signal wire (L2) and the video grounding wire (L3). The utility model can protect the video circuit, avoid interference, avoid abnormal voltage generated by the environment from puncturing circuit components and damaging the circuit, thereby prolonging the service life of the circuit.
Description
Technical Field
The utility model belongs to the field of video protection, and particularly relates to a video protection circuit for an automobile instrument.
Background
The working environment of the automobile is complex, and the control circuit of the automobile body is inevitably influenced in the environment. In a video circuit, the conditions that a video control panel is in fault, the circuit is burnt out and circuit components are broken down often occur, and the reasons for the conditions are that peripheral strong electric field coupling is generally adopted, a strong noise source or lightning stroke is connected in series with a vehicle body, high and low voltages exceeding the capacity of the components are generated, the components are broken down, and the circuit fault is generated.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a video protection circuit of an automobile instrument, which aims to solve the technical problem that a video circuit generates abnormal voltage to break down circuit components.
In order to achieve the purpose, the specific technical scheme of the utility model is as follows:
the automobile instrument video protection circuit is characterized by comprising a control panel, a display, a connector and a camera, wherein the control panel is connected with the camera after passing through the connector, and the control panel outputs a video signal to the display; the connecting wire between the connector and the camera comprises a power wire, a video signal wire and a video grounding wire, and clamping circuits are additionally arranged on the video signal wire and the video grounding wire.
Further, the power line is a 12V power line.
Further, the clamping circuit is formed by connecting a bidirectional clamping device between a video signal line and a video grounding line, and comprises a bidirectional clamping TVS and a bidirectional clamping voltage stabilizing tube.
Furthermore, the clamping circuit is formed by connecting a voltage dependent resistor between a video grounding wire and the ground of the vehicle body.
Furthermore, the clamping circuit is formed by connecting a video signal line and a video grounding line to the ground respectively and is connected with a clamping component and comprises a clamping TVS and a clamping voltage-stabilizing tube; and capacitors are respectively connected between the video signal wire and the vehicle body ground and between the video grounding wire and the vehicle body ground.
The utility model has the following advantages:
the video circuit can be protected, interference is avoided, abnormal voltage generated by the environment is prevented from puncturing circuit components and damaging the circuit, and therefore the service life of the circuit is prolonged.
Drawings
FIG. 1 is a schematic diagram of a conventional circuit of the present invention;
FIG. 2 is a schematic diagram of a clamp circuit according to the present invention;
FIG. 3 is a schematic diagram of the clamp circuit of the present invention with additional piezoresistors;
FIG. 4 is a schematic diagram of the clamp circuit of the present invention with the addition of clamping blocks D2 and D3 and capacitors;
FIG. 5 is a voltage diagram according to the present invention.
Detailed Description
For a better understanding of the objects, structure and function of the utility model, reference should be made to the following detailed description taken in conjunction with the accompanying drawings.
As shown in fig. 1, a conventional video circuit includes a control board, a display, a connector and a camera, wherein the control board is connected to the camera through the connector, and the control board outputs a video signal to the display. In a traditional video circuit, protection is only carried out on a communication part sometimes, so that stable video output is realized, but the protection is lacked in the aspect of the circuit, and when peripheral strong electric field coupling occurs, and a strong noise source or lightning stroke is connected in series with a vehicle body, the circuit is often damaged, so that the service life of components is influenced.
As shown in fig. 2, the video protection circuit of the present invention includes a control board, a display, a connector and a camera, wherein the control board is connected to the camera through the connector, and the control board outputs a video signal to the display. The connection lines between the connector and the camera include a 12V power line L1, a video signal line L2, and a video ground line L3. The 12V power supply is obtained by converting a storage battery power supply, and a clamping circuit is added to a video signal line L2 and a video grounding line L3. The connector is a universal connector.
As an example, a bidirectional clamping device D1, including a bidirectional clamping TVS and a bidirectional clamping regulator tube, is connected between the video signal line L2 and the video ground line L3, so as to stabilize the voltage between L2 and L3 and keep the voltage within a relatively stable range. As shown in fig. 5, after a bidirectional clamping regulator is connected between the video signal line L2 and the video ground line L3, the voltage V between L2 and L3 is stabilized between V1 and V2, so as to achieve the purpose of interference resistance.
As shown in fig. 3, a voltage dependent resistor Ry is further connected between the video ground line L3 and the vehicle body ground, so that the voltage V between L2 and L3 can be stabilized, and the voltage V required to be stabilized is not too high or too low.
As shown in fig. 4, on the basis of the above, the video signal line L2 and the video ground line L3 are connected to ground, and then to the clamping components D2 and D3, respectively, including the clamping TVS and the clamping regulator, as shown in fig. 4, the video signal line L2 is connected to ground, and the video ground line L3 is connected to ground, and the clamping regulator is used for stabilizing the voltages on the video signal line L2 and the video ground line L3, further stabilizing the voltage V between L2 and L3, and stabilizing the difference between V1 and V2. In order to prevent the device from breaking the protection circuit due to instantaneous over-high and low voltage breakdown in a severe environment, high voltage capacitors C1 and C2 may be connected between the video signal line L2 and the vehicle body ground and between the video ground line L3 and the vehicle body ground, respectively, and the high voltage capacitors C1 and C2 are capacitors of at least 1 KV.
It is to be understood that the present invention has been described with reference to certain embodiments, and that various changes in the features and embodiments, or equivalent substitutions may be made therein by those skilled in the art without departing from the spirit and scope of the utility model. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the utility model without departing from the essential scope thereof. Therefore, it is intended that the utility model not be limited to the particular embodiment disclosed, but that the utility model will include all embodiments falling within the scope of the appended claims.
Claims (5)
1. The automobile instrument video protection circuit is characterized by comprising a control panel, a display, a connector and a camera, wherein the control panel is connected with the camera after passing through the connector, and the control panel outputs a video signal to the display;
the connecting wire between the connector and the camera comprises a power wire L1, a video signal wire L2 and a video grounding wire L3, and a clamping circuit is added on the video signal wire L2 and the video grounding wire L3.
2. The automobile instrument video protection circuit of claim 1, wherein the power line L1 is a 12V power line.
3. The video protection circuit of automobile instrument according to claim 1, wherein the clamp circuit is a bidirectional clamp device D1 connected between a video signal line L2 and a video ground line L3, and comprises a bidirectional clamp TVS and a bidirectional clamp voltage regulator tube.
4. The video protection circuit of claim 3, wherein the clamp circuit is a voltage dependent resistor Ry connected between a video ground line L3 and a vehicle body ground.
5. The video protection circuit of the automobile instrument is characterized in that the clamping circuit is formed by connecting a video signal line L2 and a video grounding line L3 to ground with clamping components D2 and D3 respectively, and comprises a clamping TVS and a clamping voltage regulator tube;
capacitors C1 and C2 are connected between the video signal line L2 and the vehicle body ground and between the video ground line L3 and the vehicle body ground, respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122177720.3U CN216253048U (en) | 2021-09-09 | 2021-09-09 | Automobile instrument video protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122177720.3U CN216253048U (en) | 2021-09-09 | 2021-09-09 | Automobile instrument video protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216253048U true CN216253048U (en) | 2022-04-08 |
Family
ID=80985882
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122177720.3U Active CN216253048U (en) | 2021-09-09 | 2021-09-09 | Automobile instrument video protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216253048U (en) |
-
2021
- 2021-09-09 CN CN202122177720.3U patent/CN216253048U/en active Active
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