CN216930177U

CN216930177U - Anti-interference circuit for vehicle-mounted display video signal transmission

Info

Publication number: CN216930177U
Application number: CN202122923860.0U
Authority: CN
Inventors: 孟明威; 黄建威; 石锡敏
Original assignee: Sharpvision Co ltd
Current assignee: Sharpvision Co ltd
Priority date: 2021-11-26
Filing date: 2021-11-26
Publication date: 2022-07-08
Anticipated expiration: 2031-11-26

Abstract

The utility model discloses an anti-interference circuit for vehicle-mounted display video signal transmission, which comprises a power supply module, wherein the voltage output end of the power supply module is connected with a filtering amplification module to provide a ground level for a resonance matching module, the filtering amplification module receives an analog video signal of a vehicle-mounted system, filters, amplifies and outputs the analog video signal to the resonance matching module, the resonance matching module receives the analog video signal after filtering and amplification, generates an induction analog video signal, isolates and grounds, filters a direct-current analog video signal from the induction analog video signal, and outputs an alternating-current analog video signal. The anti-interference circuit for vehicle-mounted display video signal transmission can solve the problems that ground wire signals are asynchronous, backflow signals are seriously interfered, and interference is brought to a video effect.

Description

Anti-interference circuit for vehicle-mounted display video signal transmission

Technical Field

The utility model relates to the technical field of video transmission circuits, in particular to an anti-interference circuit for vehicle-mounted display video signal transmission.

Background

In recent years, with the rapid development of science and technology, high-definition video signals are mature and stable day by day, and vehicle-mounted video display systems are increasingly widespread, and the vehicle-mounted video display systems have the advantages of increasing safety performance, reliability and high-definition experience and only need to provide power supplies required by the systems. However, the host and the display screen on the market are almost separately designed and are not designed by the same manufacturer or company, so different power supplies and signals have certain difference; due to the problem of ground wire signal asynchronism, the backflow signal is seriously interfered, and the interference problem is brought to the video effect.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a safe and reliable anti-interference circuit for vehicle-mounted display video signal transmission.

The anti-interference circuit for vehicle-mounted display video signal transmission comprises a power supply module, wherein the voltage output end of the power supply module is connected with a filtering amplification module to provide a grounded zero level signal for a resonance matching module, the filtering amplification module receives an analog video signal of a vehicle-mounted system, filters, amplifies and outputs the analog video signal to the resonance matching module, the resonance matching module receives the analog video signal after filtering and amplification, generates an induction analog video signal, isolates and grounds, filters the induction analog video signal to remove a direct current analog video signal, and outputs an alternating current analog video signal.

The anti-interference circuit for vehicle-mounted display video signal transmission can solve the problems that ground wire signals are asynchronous, backflow signals are seriously interfered, and the video effect is interfered by filtering, amplifying and isolating analog video signals. The analog video signals between the systems can be in seamless butt joint, and the system has the advantages of convenience in use, high reliability, long transmission distance and the like, meets market requirements very well, and has important practical significance and commercial value.

Drawings

FIG. 1 is a schematic diagram of an anti-jamming circuit for vehicle display video signal transmission in accordance with the present invention;

FIG. 2 is a circuit schematic of a power module;

FIG. 3 is a schematic circuit diagram of a filter amplifier module;

fig. 4 is a circuit schematic of the resonant matching module.

Detailed Description

The system word is derived from the transliteration of the English system, i.e. several parts are interconnected and interacted to form a whole with certain functions. The method refers to an organic whole with specific functions formed by a plurality of related things or systems with certain mutual awareness: methods generally classified as natural systems, artificial systems, complex systems describe systems have symbols, unit impulse responses, differential equations, graphs, and the like.

The ground wire is a wire connected to the ground, to the housing or to zero in the electrical system or the electronic device. In general, the earth wire is connected to the casing to prevent the electric shock accident caused by the internal insulation damage of the electric appliance. The ground wire is short for the grounding device. The ground wire is divided into a working ground and a safety ground. This refers to zero level signals that the devices refer to each other in the electronic system device.

Analog video is a video image composed of continuous analog signals, and movies and televisions that have been in contact with the past are analog signals, and are therefore referred to as analog signals because they simulate physical quantities representing sound and image information. The analog video signal mainly includes a luminance signal, a chrominance signal, a composite synchronization signal, and an accompanying sound signal.

Signals are carriers of information and are usually expressed in some physical quantities, and different communication techniques and transmission signal forms are used. The characteristics of the signal: the signals must be of a kind that can be varied, observed and realized.

The anti-jamming circuit for vehicle-mounted display video signal transmission provided by the embodiment is shown in fig. 1 and comprises a power supply module, wherein a voltage output end of the power supply module is connected with a filtering amplification module to provide a grounded zero-level signal for a resonance matching module, the filtering amplification module receives an analog video signal AHD of a vehicle-mounted system and outputs the analog video signal AHD to the resonance matching module through filtering amplification, the resonance matching module receives the analog video signal after filtering amplification, generates an induction analog video signal and isolates the grounding, and outputs the induction analog video signal filtering direct-current analog video signal to an alternating-current analog video signal AHD-OUT.

The power supply module is a wide voltage power supply module, the direct current voltage value of the input end of the wide voltage power supply module is 8-30V, the direct current voltage value of the output end of the wide voltage power supply module is 3.3V, the direct current voltage value of the input end of the wide voltage power supply module is 12V, and the input end of the wide voltage power supply module is provided with an anti-reverse diode D1, as shown in FIG. 2. The power module can use the on-vehicle host computer power supply also can use the system power supply of external demonstration, and inside is wide power design simultaneously to and prevent joining conversely and handle, avoid keeping apart design both ends voltage inconsistent, the power crosses lowly or too high, and the power is unusual and damages between the system that leads to, selects suitable power supply mode according to the voltage situation at both ends, if: the wide voltage design of 5-30V voltage can avoid the condition that the voltage of the vehicle-mounted system is inconsistent.

The filtering and amplifying module comprises a filtering amplifier U1, a filtering capacitor C1, a filtering capacitor C2, a resistor R2 and a resistor R3, wherein the IN end of the filtering amplifier U1 is connected with one end of the filtering capacitor C1, the other end of the filtering capacitor C1 is connected with one end of the resistor R2 and the input end of an analog video signal of the vehicle-mounted system, the other end of the resistor R2 is grounded, the + VS end of the filtering amplifier U1 is connected with one end of the filtering capacitor C2 and the output end of the power module, the OUT end of the filtering amplifier U1 is connected with one end of the resistor R3, the other end of the resistor R3 is connected with the anode of the capacitor C3, and an FB bead is mounted at the + VS end of the filtering amplifier U1, as shown IN FIG. 3. The filter amplification module is used for carrying out gain amplification on the analog video signal to strengthen the driving capability of the signal, so that the image is safer and more reliable in the transmission process and has strong interference resistance; in addition, long-distance transmission and attenuation resistance can be realized through the filtering amplification module, so that signals still keep high amplitude and driving capability in 5m long-distance transmission in a vehicle-mounted system, a long-distance transmission mode can be realized, attenuation can be reduced, and signal stability is enhanced.

The resonance matching module comprises an electromagnetic induction module and a direct current and alternating current isolating module, wherein the electromagnetic induction module receives the analog video signals after filtering and amplification, generates induction analog video signals and isolates and grounds the induction analog video signals, and the direct current and alternating current isolating module filters the induction analog video signals to remove direct current analog video signals and outputs alternating current analog video signals. The electromagnetic induction module comprises a common-mode inductor U2, wherein the + OUT end of the common-mode inductor U2 is connected with a ground zero level signal GND IN of a power supply module, the-OUT end of the common-mode inductor U2 is connected with a ground zero level signal GND OUT of the power supply module, the + VIN end and the-VIN end of the common-mode inductor U2 are electrically connected with a direct current blocking alternating current module, and the common-mode inductor U2 comprises a primary coil and a secondary coil, as shown IN FIG. 4, the common-mode inductor utilizes the common-mode inductor of the electromagnetic induction to convert an alternating current signal into a magnetic signal and then into an electric signal, and the magnetic core of the inductor to generate alternating current, so that voltage or current is induced IN the secondary coil. The anti-direct-current-through-crossing module comprises a polar capacitor C3 and a polar capacitor C4, the anode of the polar capacitor C3 is electrically connected with the filtering amplification module, the cathode of the polar capacitor C3 is electrically connected with the + VIN end of the common-mode inductor U2, the anode of the polar capacitor C4 is electrically connected with the-VIN end of the common-mode inductor U2, and the cathode of the polar capacitor C4 outputs alternating-current analog video signals.

The foregoing is a further detailed description of the utility model in connection with specific preferred embodiments and it is not intended to limit the utility model to the specific embodiments described. For those skilled in the art to which the utility model pertains, several simple deductions or substitutions can be made without departing from the spirit of the utility model, and all shall be considered as belonging to the protection scope of the utility model.

Claims

1. The utility model provides an anti-jamming circuit of on-vehicle display video signal transmission which characterized in that, includes power module, power module's voltage output end connects filtering amplification module, provides ground connection zero level signal for resonance matching module, filtering amplification module receives on-vehicle system's analog video signal to filtering amplification output to resonance matching module, resonance matching module receives the analog video signal after filtering amplification, produces response analog video signal and keeps apart ground connection, will respond to analog video signal filtering direct current analog video signal output and exchange analog video signal.

2. The anti-interference circuit for vehicle-mounted display video signal transmission according to claim 1, wherein the resonance matching module comprises an electromagnetic induction module and a direct current blocking and alternating current blocking module, the electromagnetic induction module receives the analog video signal after filtering and amplification, generates an induction analog video signal and is isolated and grounded, and the direct current blocking and alternating current blocking module filters the induction analog video signal to remove a direct current analog video signal and outputs an alternating current analog video signal.

3. The anti-jamming circuit for vehicle-mounted display video signal transmission according to claim 2, wherein the electromagnetic induction module comprises a common-mode inductor U2, the + OUT terminal of the common-mode inductor U2 is connected to the ground zero level signal GND IN of the power supply module, the-OUT terminal of the common-mode inductor U2 is connected to the ground zero level signal GND OUT of the power supply module, and the + VIN terminal and the-VIN terminal of the common-mode inductor U2 are electrically connected to the DC-isolated AC module.

4. The vehicle-mounted display video signal transmission anti-jamming circuit according to claim 3, wherein the anti-direct current module comprises a polar capacitor C3 and a polar capacitor C4, an anode of the polar capacitor C3 is electrically connected to the filtering and amplifying module, a cathode of the polar capacitor C3 is electrically connected to a + VIN terminal of the common-mode inductor U2, an anode of the polar capacitor C4 is electrically connected to a-VIN terminal of the common-mode inductor U2, and a cathode of the polar capacitor C4 outputs an alternating current analog video signal.

5. The vehicle-mounted display video signal transmission anti-jamming circuit according to claim 4, wherein the filtering and amplifying module includes a filtering amplifier U1, a filtering capacitor C1, a filtering capacitor C2, a resistor R2 and a resistor R3, an IN terminal of the filtering amplifier U1 is connected to one terminal of the filtering capacitor C1, the other terminal of the filtering capacitor C1 is connected to one terminal of the resistor R2 and an input terminal of an analog video signal of a vehicle-mounted system, the other terminal of the resistor R2 is grounded, a + VS terminal of the filtering amplifier U1 is connected to one terminal of the filtering capacitor C2 and an output terminal of the power module, an OUT terminal of the filtering amplifier U1 is connected to one terminal of the resistor R3, and the other terminal of the resistor R3 is connected to an anode of the linear capacitor C3.

6. The vehicle display video signal transmission immunity circuit of claim 5, wherein the filter amplifier module includes a magnetic bead FB, and the magnetic bead FB is installed at the + VS terminal of the filter amplifier U1.

7. The anti-jamming circuit for vehicle display video signal transmission according to claim 5, wherein a transfer resistor R1 is connected between the filter capacitor C1 and the input end of the analog video signal of the vehicle system.

8. The on-board display video signal transmission immunity circuit of any one of claims 1-7, wherein the power module is a wide voltage power module.

9. The on-vehicle display video signal transmission interference rejection circuit according to claim 8, wherein said wide voltage power supply module has a dc voltage value at an input terminal of 8-30V and a dc voltage value at an output terminal of 3.3V.

10. The on-vehicle display video signal transmission anti-jamming circuit of claim 8, in which the input terminal of the wide voltage power supply module is provided with an anti-reverse diode.