Video transmission anti-interference circuit of automobile electronic rearview mirror

Abstract

The utility model discloses an anti-interference circuit for video transmission of an electronic rearview mirror of an automobile. The anti-interference circuit comprises a front-end video data acquisition circuit unit, a video data processing circuit unit, a rear-end video data display circuit unit and a power supply module, the front-end video data acquisition input circuit unit comprises a video data acquisition system and a common mode inductor CM1, and the output end of the video data acquisition system is electrically connected with the input end of the common mode inductor CM1; the video data processing circuit unit comprises a video data processing system and a common mode inductor CM2, the input end of the video data processing system is electrically connected with the output end of the common mode inductor CM2, and the output end of the common mode inductor CM1 is electrically connected with the input end of the common mode inductor CM2 through a coaxial line; the output end of the video data processing circuit unit is electrically connected with the input end of the rear-end video data display circuit unit through a group of LVDS signals. According to the invention, common-mode interference signals of various frequencies in a video signal transmission link can be effectively filtered, so that the video quality is effectively improved.

Description

Technical Field

[0001] The present application relates to the technical field of digital signal video transmission technology for automobile electronic rearview mirrors, and in particular to an anti-interference circuit for video transmission of automobile electronic rearview mirrors. Background Art

[0002] The automotive electronic rearview mirror mainly includes a video data acquisition system, a video data processing system and a video display system. The video data acquisition system and the video data processing system mainly use coaxial signal lines for video signal transmission. Coaxial signal lines have the advantages of easy installation and low cost, but they are also susceptible to interference. In some scenes with complex signals, such as automotive video display systems, video signals are subject to complex interference during the process of being transmitted from image acquisition to the data processing system via coaxial signal lines. This can seriously affect the image quality of the data processing output display image, causing random screen flashing, jittering and other phenomena on the displayed screen. In addition to causing driving safety hazards, these phenomena also bring a bad visual experience to the driver. Utility Model Content

[0003] The purpose of this application is to provide an anti-interference circuit for video transmission of an automotive electronic rearview mirror to solve the technical problems raised in the above-mentioned background technology.

[0004] To achieve the above-mentioned purpose, the present application discloses the following technical solutions: an anti-interference circuit for video transmission of an automotive electronic rearview mirror, comprising a front-end video data acquisition circuit unit, a video data processing circuit unit, a back-end video data display circuit unit and a power supply module;

[0005] The output end of the front-end video data acquisition input circuit unit is electrically connected to the input end of the video data processing circuit unit through a coaxial line; wherein the front-end video data acquisition input circuit unit includes a video data acquisition system and a common-mode inductor CM1, and the output end of the video data acquisition system is electrically connected to the input end of the common-mode inductor CM1; the video data processing circuit unit includes a video data processing system and a common-mode inductor CM2, and the input end of the video data processing system is electrically connected to the output end of the common-mode inductor CM2, and the output end of the common-mode inductor CM1 and the input end of the common-mode inductor CM2 are electrically connected through the coaxial line;

[0006] The output end of the video data processing circuit unit is electrically connected to the input end of the back-end video data display circuit unit through a set of LVDS signals;

[0007] The power supply module includes a BUCK power supply 1 and a BUCK power supply 2; the BUCK power supply 1 is electrically connected to the front-end video data acquisition input circuit unit, and the BUCK power supply 2 is electrically connected to the video data processing circuit unit and the back-end video data display circuit unit.

[0008] In one implementation, the front-end video data acquisition input circuit unit further includes: a capacitor C1, a capacitor C2, a capacitor C3, a resistor R1, a filter inductor L1, a filter inductor L2, a filter inductor L3 and an electrostatic diode D1;

[0009] The first pin of the capacitor C1 is electrically connected to the first pin of the filter inductor L1 and the power supply end of the video data acquisition system, and the second pin of the capacitor C1 is electrically connected to GND; the second pin of the filter inductor L1 is electrically connected to the BUCK power supply 1; the second pin of the filter inductor L2 is electrically connected to the BUCK power supply 1, and the first pin of the filter inductor L2 is electrically connected to the second pin of the filter inductor L3; the first pin of the filter inductor L3 is electrically connected to the second pin of the capacitor C2, the first pin of the electrostatic diode D1, and the The second PIN of the common-mode inductor CM1 is electrically connected; the output end of the video data acquisition system is electrically connected to the first PIN of the capacitor C2 and the first PIN of the capacitor C3; the first PIN of the resistor R1 is electrically connected to the second PIN of the capacitor C3, and the second PIN of the resistor R1 is electrically connected to GND; the second PIN of the electrostatic diode D1 is electrically connected to GND; the first PIN of the common-mode inductor CM1 is electrically connected to GND, and the third and fourth PINs of the common-mode inductor CM1 are electrically connected to the input end of the video data processing circuit unit.

[0010] In one implementation, the video data processing circuit unit further includes: a capacitor C4, a capacitor C5, a capacitor C6, a resistor R2, a filter inductor L4, a filter inductor L5, a filter inductor L6 and an electrostatic diode D2;

[0011] The first pin of the capacitor C6 is electrically connected to the first pin of the filter inductor L6 and the power supply end of the video data processing system, and the second pin of the capacitor C6 is electrically connected to GND; the second pin of the filter inductor L6 is electrically connected to the BUCK power supply 2, the second pin of the filter inductor L4 is electrically connected to the power supply end, and the first pin of the filter inductor L4 is electrically connected to the second pin of the filter inductor L5; the first pin of the filter inductor L5 is electrically connected to the second pin of the capacitor C4, the first pin of the electrostatic diode D2, and the common mode inductor D3. The 2nd PIN of CM2 is electrically connected; the input end of the video data processing system is electrically connected to the 1st PIN of the capacitor C4 and the 1st PIN of the capacitor C5; the 1st PIN of the resistor R2 is electrically connected to the 2nd PIN of the capacitor C5, and the 2nd PIN of the resistor R2 is electrically connected to GND; the 2nd PIN of the electrostatic diode D2 is electrically connected to GND; the 1st PIN of the common-mode inductor CM2 is electrically connected to GND, and the 3rd PIN and 4th PIN of the common-mode inductor CM2 are electrically connected to the output end of the front-end video data acquisition input circuit unit.

[0012] In one implementation, the back-end video data display circuit unit includes: a capacitor C7, a filter inductor L7 and a video data display system;

[0013] The first pin of the capacitor C7 is electrically connected to the first pin of the filter inductor L7 and the power supply end of the video data display system, the second pin of the capacitor C7 is electrically connected to GND; the second pin of the filter inductor L7 is electrically connected to the BUCK power supply 2.

[0014] Beneficial effects: In the automotive electronic rearview mirror video transmission anti-interference circuit of the present application, the output end of the front-end video data acquisition input circuit unit and the input end of the video data processing circuit unit are electrically connected through a coaxial line with a common-mode inductor matching specific parameters. Since a unique common-mode filtering circuit is provided in the video signal transmission link, common-mode interference signals of various frequencies in the video signal transmission link can be effectively filtered out, thereby maintaining the integrity of the signal entering the video data processing system without noise, and effectively improving the video quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0016] Figure 1A circuit schematic diagram of an automotive electronic rearview mirror video transmission anti-interference circuit provided in an embodiment of the present application.

[0017] Figure numerals: 10, front-end video data acquisition input circuit unit; 20, video data processing circuit unit; 30, back-end video data display circuit unit; 40, power supply module. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present application are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

[0019] In this article, the term "comprising" is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of more restrictions, the elements defined by the sentence "comprising..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0020] The automotive electronic rearview mirror mainly includes a video data acquisition system, a video data processing system and a video display system. The video data acquisition system and the video data processing system mainly use coaxial signal lines to transmit video signals. Coaxial signal lines have the advantages of easy installation and low cost, but they are also susceptible to interference.

[0021] In this regard, this embodiment discloses Figure 1 The video transmission anti-interference circuit of an automotive electronic rearview mirror shown in the figure includes a front-end video data acquisition input circuit unit 10, a video data processing circuit unit 20, a rear-end video data display circuit unit 30 and a power supply module 40. Specifically, the output end of the front-end video data acquisition input circuit unit 10 is electrically connected to the input end of the video data processing circuit unit 20 through a coaxial line; the output end of the video data processing circuit unit 20 is electrically connected to the input end of the rear-end video data display circuit unit 30 through a set of LVDS signals. The power supply module 40 includes a BUCK power supply 1 and a BUCK power supply 2; the BUCK power supply 1 is electrically connected to the front-end video data acquisition input circuit unit 10, and the BUCK power supply 2 is electrically connected to the video data processing circuit unit 20 and the rear-end video data display circuit unit 30.

[0022] In this embodiment, the front-end video data acquisition input circuit unit 10 includes: capacitor C1, capacitor C2, capacitor C3, resistor R1, filter inductor L1, filter inductor L2, filter inductor L3, electrostatic diode D1, common mode inductor CM1 and video data acquisition system, wherein the video data acquisition system can be any one of the existing technologies.

[0023] In the front-end video data acquisition input circuit unit 10 of the present embodiment, the first pin of the capacitor C1 is electrically connected to the first pin of the filter inductor L1 and the power supply end of the video data acquisition system, and the second pin of the capacitor C1 is electrically connected to GND; the second pin of the filter inductor L1 is electrically connected to the BUCK power supply 1; the second pin of the filter inductor L2 is electrically connected to the BUCK power supply 1, and the first pin of the filter inductor L2 is electrically connected to the second pin of the filter inductor L3; the first pin of the filter inductor L3 is electrically connected to the second pin of the capacitor C2 and the electrostatic diode The 1st PIN of the tube D1 and the 2nd PIN of the common-mode inductor CM1 are electrically connected; the output end of the video data acquisition system is electrically connected to the 1st PIN of the capacitor C2 and the 1st PIN of the capacitor C3; the 1st PIN of the resistor R1 is electrically connected to the 2nd PIN of the capacitor C3, and the 2nd PIN of the resistor R1 is electrically connected to GND; the 2nd PIN of the electrostatic diode D1 is electrically connected to GND; the 1st PIN of the common-mode inductor CM1 is electrically connected to GND, and the 3rd PIN and 4th PIN of the common-mode inductor CM1 are electrically connected to the input end of the video data processing circuit unit 20.

[0024] In this embodiment, the video data processing circuit unit 20 includes: capacitor C4, capacitor C5, capacitor C6, resistor R2, filter inductor L4, filter inductor L5, filter inductor L6, electrostatic diode D2, common mode inductor CM2 and video data processing system, wherein the video data processing system can be any one of the prior art.

[0025] In the video data processing circuit unit 20 of the present embodiment, the first pin of the capacitor C6 is electrically connected to the first pin of the filter inductor L6 and the power supply terminal of the video data processing system, and the second pin of the capacitor C6 is electrically connected to GND; the second pin of the filter inductor L6 is electrically connected to the BUCK power supply 2, the second pin of the filter inductor L4 is electrically connected to the power supply terminal, the first pin of the filter inductor L4 is electrically connected to the second pin of the filter inductor L5; the first pin of the filter inductor L5 is electrically connected to the second pin of the capacitor C4 and the first pin of the electrostatic diode D2. IN and the 2nd PIN of the common-mode inductor CM2 are electrically connected; the input end of the video data processing system is electrically connected to the 1st PIN of the capacitor C4 and the 1st PIN of the capacitor C5; the 1st PIN of the resistor R2 is electrically connected to the 2nd PIN of the capacitor C5, and the 2nd PIN of the resistor R2 is electrically connected to GND; the 2nd PIN of the electrostatic diode D2 is electrically connected to GND; the 1st PIN of the common-mode inductor CM2 is electrically connected to GND, and the 3rd PIN and 4th PIN of the common-mode inductor CM2 are electrically connected to the output end of the front-end video data acquisition input circuit unit 10.

[0026] In this embodiment, the back-end video data display circuit unit 30 includes: a capacitor C7, a filter inductor L7 and a video data display system, wherein the video data display system can be any one of the prior arts.

[0027] In the back-end video data display circuit unit 30 of the present embodiment, the 1st PIN of the capacitor C7 is electrically connected to the 1st PIN of the filter inductor L7 and the power supply end of the video data display system, the 2nd PIN of the capacitor C7 is electrically connected to GND; the 2nd PIN of the filter inductor L7 is electrically connected to the BUCK power supply 2.

[0028] Working principle: The external power supply BUCK1 supplies power to the front-end video data acquisition input circuit unit 10, and the external power supply BUCK2 supplies power to the video data processing circuit unit 20 and the back-end video data display circuit unit 30. The data of the front-end video acquisition system is connected to the specific common mode inductor CM1 filter, transmitted through a longer coaxial line, and then connected to the specific common mode inductor CM2 filter input video data processing system. The video data processing system outputs the LVDS signal to the back-end video data display system to present a stable, clean and complete acquisition video image, which has functional safety hazards.

[0029] Based on the above, the automotive electronic rearview mirror video transmission anti-interference circuit provided in this embodiment can effectively filter out common-mode interference signals of various frequencies in the video signal transmission link because a unique common-mode filtering circuit is provided in the video signal transmission link, thereby maintaining the integrity of the signal entering the video data processing system without noise, and effectively improving the video quality.

[0030] Finally, it should be noted that the above is only a preferred embodiment of the present application and is not intended to limit the present application. Although the present application has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. An anti-interference circuit for video transmission of an automotive electronic rearview mirror, characterized in that: It comprises a front-end video data acquisition input circuit unit (10), a video data processing circuit unit (20), a back-end video data display circuit unit (30) and a power supply module (40); The output end of the front-end video data acquisition input circuit unit (10) is electrically connected to the input end of the video data processing circuit unit (20) via a coaxial line; wherein the front-end video data acquisition input circuit unit (10) comprises a video data acquisition system and a common-mode inductor CM1, and the output end of the video data acquisition system is electrically connected to the input end of the common-mode inductor CM1; the video data processing circuit unit (20) comprises a video data processing system and a common-mode inductor CM2, and the input end of the video data processing system is electrically connected to the output end of the common-mode inductor CM2, and the output end of the common-mode inductor CM1 is electrically connected to the input end of the common-mode inductor CM2 via the coaxial line; The output end of the video data processing circuit unit (20) is electrically connected to the input end of the back-end video data display circuit unit (30) via a set of LVDS signals; The power supply module (40) comprises a BUCK power supply 1 and a BUCK power supply 2; the BUCK power supply 1 is electrically connected to a front-end video data acquisition input circuit unit (10), and the BUCK power supply 2 is electrically connected to the video data processing circuit unit (20) and the back-end video data display circuit unit (30).

2. The automotive electronic rearview mirror video transmission anti-interference circuit according to claim 1, characterized in that: The front-end video data acquisition input circuit unit (10) further comprises: a capacitor C1, a capacitor C2, a capacitor C3, a resistor R1, a filter inductor L1, a filter inductor L2, a filter inductor L3 and an electrostatic diode D1; The first pin of the capacitor C1 is electrically connected to the first pin of the filter inductor L1 and the power supply end of the video data acquisition system, and the second pin of the capacitor C1 is electrically connected to GND; the second pin of the filter inductor L1 is electrically connected to the BUCK power supply 1; the second pin of the filter inductor L2 is electrically connected to the BUCK power supply 1, and the first pin of the filter inductor L2 is electrically connected to the second pin of the filter inductor L3; the first pin of the filter inductor L3 is electrically connected to the second pin of the capacitor C2, the first pin of the electrostatic diode D1, and the common The second pin of the common mode inductor CM1 is electrically connected; the output end of the video data acquisition system is electrically connected to the first pin of the capacitor C2 and the first pin of the capacitor C3; the first pin of the resistor R1 is electrically connected to the second pin of the capacitor C3, and the second pin of the resistor R1 is electrically connected to GND; the second pin of the electrostatic diode D1 is electrically connected to GND; the first pin of the common mode inductor CM1 is electrically connected to GND, and the third pin and the fourth pin of the common mode inductor CM1 are electrically connected to the input end of the video data processing circuit unit (20).

3. The anti-interference circuit for video transmission of an automotive electronic rearview mirror according to claim 1, characterized in that: The video data processing circuit unit (20) further comprises: a capacitor C4, a capacitor C5, a capacitor C6, a resistor R2, a filter inductor L4, a filter inductor L5, a filter inductor L6 and an electrostatic diode D2; The first pin of the capacitor C6 is electrically connected to the first pin of the filter inductor L6 and the power supply end of the video data processing system, and the second pin of the capacitor C6 is electrically connected to GND; the second pin of the filter inductor L6 is electrically connected to the BUCK power supply 2, the second pin of the filter inductor L4 is electrically connected to the power supply end, and the first pin of the filter inductor L4 is electrically connected to the second pin of the filter inductor L5; the first pin of the filter inductor L5 is electrically connected to the second pin of the capacitor C4, the first pin of the electrostatic diode D2, and the common mode inductor CM The second PIN of the first capacitor C2 is electrically connected to the first PIN of the first capacitor C4; the input end of the video data processing system is electrically connected to the first PIN of the first capacitor C4 and the first PIN of the first capacitor C5; the first PIN of the first resistor R2 is electrically connected to the second PIN of the first capacitor C5, and the second PIN of the first resistor R2 is electrically connected to GND; the second PIN of the second electrostatic diode D2 is electrically connected to GND; the first PIN of the first common mode inductor CM2 is electrically connected to GND, and the third PIN and the fourth PIN of the first common mode inductor CM2 are electrically connected to the output end of the front-end video data acquisition input circuit unit (10).

4. The automotive electronic rearview mirror video transmission anti-interference circuit according to claim 1, characterized in that: The back-end video data display circuit unit (30) comprises: a capacitor C7, a filter inductor L7 and a video data display system; The first pin of the capacitor C7 is electrically connected to the first pin of the filter inductor L7 and the power supply end of the video data display system, the second pin of the capacitor C7 is electrically connected to GND; the second pin of the filter inductor L7 is electrically connected to the BUCK power supply 2.

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