Vehicle-mounted video transmission module USB interface

Abstract

The utility model relates to the technical field of vehicle-mounted video USB (Universal Serial Bus) interfaces, and mainly relates to a vehicle-mounted video transmission module USB interface, which comprises a USB interface, a video transmission chip and a vehicle-mounted host, the USB interface is a Type-C interface; the video transmission chip is an ANX7443 chip, and the video transmission chip is connected with the USB interface through a Main Link channel and an auxiliary channel; the vehicle-mounted host and the video transmission chip are connected through a MainLink channel and an auxiliary channel, transcoding and decoding processes are canceled by adopting a DP1.4 transmission protocol and DP data direct transmission, a power module compatible mobile equipment charging, a video transmission module and a protocol handshake control module are arranged in the vehicle-mounted host, the structure is simplified, and meanwhile the production and manufacturing cost is reduced.

Description

Technical Field

[0001] This utility model relates to the field of vehicle-mounted video USB interface technology, and mainly to a vehicle-mounted video transmission module USB interface. Background Technology

[0002] With the development of new energy electric vehicles, the demand for in-vehicle entertainment functions is increasing. The in-vehicle USB interface serves as an interface to provide entertainment functions for users. Users can insert a USB flash drive or external hard drive containing video files into the USB interface of the in-vehicle video transmission module and play the video content, such as movies, TV series, and music videos, through the in-vehicle video system, thus enriching the in-vehicle entertainment experience.

[0003] The USB interface also allows smartphones or tablets to be connected to the in-vehicle video system. This enables video content from mobile devices to be projected onto the in-vehicle display screen for playback; it also allows for interactive operation between the mobile device and the in-vehicle system, such as controlling video playback software on the phone via the in-vehicle screen, adjusting playback progress, volume, etc.

[0004] Chinese utility model patent application number 202321504870.3 discloses a high-power in-vehicle charging module supporting USB data and video DP data. The module includes a control circuit that performs a DC-DC conversion on the DC input power received at its input terminal Vin to provide power to a first downstream USB interface and / or a second downstream USB interface; a video data converter that converts video data from an HMTD interface to video DP data and provides it to a first multiplexer and / or a second multiplexer; a hub controller that provides USB data from an upstream USB interface to the first multiplexer and / or the second multiplexer; a first multiplexer that switches between USB data and video DP data to the first downstream USB interface; and a second multiplexer that switches between USB data and video DP data to the second downstream USB interface based on the control of the control circuit. Compared to existing technologies, this utility model not only solves the problem of high-power charging for computers and tablets but also enhances the in-cabin entertainment experience.

[0005] However, the charging module that supports both USB data and video DP data in the above-mentioned technical solutions has a complex structure and uses six chips, resulting in high manufacturing costs. Utility Model Content

[0006] To address the above issues, this utility model provides a USB interface for an in-vehicle video transmission module. By adopting the DP1.4 transmission protocol, DP data is directly transmitted, eliminating the transcoding and decoding processes. The included power module is compatible with mobile device charging, video transmission, and protocol handshake control modules, thus simplifying the structure and reducing manufacturing costs.

[0007] The technical solution adopted by the USB interface of the vehicle-mounted video transmission module provided in this application is as follows:

[0008] A USB interface for an in-vehicle video transmission module, comprising:

[0009] USB interface, video transmission chip and vehicle host;

[0010] The USB interface is a Type-C interface;

[0011] The video transmission chip is an ANX7443 chip, which is connected to the USB interface through the MainLink channel and the auxiliary channel.

[0012] The vehicle-mounted host and the video transmission chip are connected via the MainLink channel and the auxiliary channel.

[0013] As an improvement, the USB interface is equipped with a USB 2.0 differential signal transmission channel for transmitting USB 2.0 data signals.

[0014] As an improvement, the video transmission chip is equipped with a DC power input pin VDD33.

[0015] As an improvement, both the video transmission chip and the vehicle host are equipped with hot-swap detection HPD1.

[0016] As an improvement, a power management chip, namely the CPSQ5206 chip, is used. This power management chip is connected to the USB interface via pins CC1 and CC2, and is connected to the VBUS on the USB interface via current transmission.

[0017] As an improvement, the power management chip has a DC power input pin VDD5.

[0018] As an improvement, the power management chip and the video transmission chip are connected to the DPSEL signal via an I2C channel.

[0019] The beneficial effects of this utility model are as follows:

[0020] This utility model adopts the DP1.4 transmission protocol, which directly transmits DP data, eliminating the transcoding and decoding process. It includes a power module compatible with mobile device charging, video transmission, and protocol handshake control modules, thus simplifying the structure. The signal processing chip uses ANX7443Retimers. Compared with simple redrivers on the market, this solution has dynamic gain adjustment, supports a maximum of 7-meter wire harness transmission, and reduces manufacturing costs.

[0021] In summary, the in-vehicle video transmission module USB interface of this utility model has the advantages of being compatible with TYPE-C interface for video transmission, supporting 60W fast charging, direct transmission of DP signal with low latency, using retimers to adjust and enhance signal quality, and being able to achieve dynamic compensation according to different cable lengths. It has a simple structure and low manufacturing cost, and is especially suitable for the field of in-vehicle USB video transmission technology. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the USB interface connection structure of the vehicle-mounted video transmission module of this utility model. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0025] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0026] Example 1:

[0027] like Figure 1 As shown, a vehicle-mounted video transmission module USB interface includes:

[0028] USB interface 1, video transmission chip 2 and vehicle host 3;

[0029] USB port 1 is a Type-C port;

[0030] The video transmission chip 2 is an ANX7443 chip. This video transmission chip 2 is connected to the USB interface 1 through the MainLink channel and the auxiliary channel. The ANX7443 chip plays a key role in the USB transmission module to ensure high-speed and stable video data transmission.

[0031] The vehicle-mounted host 3 and the video transmission chip 2 are connected via the MainLink channel and the auxiliary channel.

[0032] The ANX7443 chip, as a 10Gbps USB 3.2 single-chip retimer, can meet the high-speed transmission requirements of high-definition and even ultra-high-definition in-vehicle video data. It can transmit video data output from the video processing module to the in-vehicle head unit or other display devices at high speed via the USB interface, enabling real-time video playback.

[0033] In automotive environments, the integrity of USB signals may be affected by factors such as electromagnetic interference. The ANX7443 chip features loss compensation, which can compensate for the up to 23dB channel loss generated by USB 3.2 Gen 210Gbps, ensuring stable signal transmission and reducing data errors and packet loss.

[0034] The ANX7443 chip fully complies with the latest USB 3.2 specification requirements, especially the retimer requirements defined in Appendix E. It supports four retimers connected and seamlessly cascaded, thus meeting the USB 3.2 CTS requirements. This makes the module highly compatible with various USB devices and easy to expand and upgrade.

[0035] The USB interface 1 is equipped with a USB 2.0 differential signal transmission channel for transmitting USB 2.0 data signals.

[0036] Furthermore, the video transmission chip 2 is equipped with a DC power input pin VDD33, which provides a stable 3.3V power supply to the video transmission chip 2, meeting its operating voltage requirements and ensuring the normal operation of each part of the circuit within the module.

[0037] Furthermore, both the video transmission chip 2 and the vehicle host 3 are equipped with hot-plug detection HPD1. The HPD signal is mainly used to detect hot-plugging and also as an interrupt request from the receiving device. This is a single-wire signal.

[0038] It should be noted that hot-plug detection enables the vehicle's head unit to quickly and accurately detect the connection or disconnection status of video transmission devices. When a video transmission device is detected being inserted, the head unit can promptly initialize the relevant communication protocols and configuration parameters to ensure that video signals can be transmitted and received correctly. When the device is unplugged, the head unit can also react quickly, stopping the transmission of relevant signals to avoid interruptions or errors in signal transmission.

[0039] Example 2:

[0040] Referring to Embodiment 1, the difference between Embodiment 2 and Embodiment 1 of this utility model is as follows:

[0041] like Figure 1 As shown, a vehicle-mounted video transmission module USB interface also includes a power management chip 4, which is a CPSQ5206 chip. The power management chip 4 is connected to the USB interface 1 through pins CC1 and CC2, and the power management chip 4 is connected to the VBUS on the USB interface 1 through current transmission.

[0042] Specifically, the power management chip 4 has a DC power input pin VDD5.

[0043] Furthermore, the power management chip 4 and the video transmission chip 2 are connected to the DPSEL signal via the I2C channel.

[0044] The CPSQ5206 chip is primarily responsible for voltage conversion and regulation in the power management module, providing a stable power supply to the USB module. Its wide input voltage range (3.8V to 36V) adapts well to this situation. It can step down or boost the unstable DC voltage input from the vehicle power supply, outputting a stable voltage to power other modules. Depending on the needs of different modules, the CPSQ5206 chip can be configured via I2C to output various stable voltages. For example, it can provide 3.3V or 5V power to the video processing module, and 1.2V or 1.8V core voltage and 3.3V I / O voltage to the ANX7443 chip, meeting the voltage requirements for normal operation of each chip.

[0045] Furthermore, the CPSQ5206 chip features comprehensive protection functions, including programmable input overvoltage protection, output overvoltage protection, output short-circuit protection, MOSFET cycle-by-cycle current limiting, and thermal shutdown. These features effectively prevent power supply abnormalities from damaging the entire module and ensure system stability and reliability.

[0046] The ANX7443 chip features DisplayPort multiplexing capabilities, and the DPSEL signal can be used to select specific DisplayPort channels or modes. Through an I2C connection, the CPSQ5206 chip can communicate with the ANX7443 chip, dynamically configuring and switching the transmission path and mode of the video signal according to system requirements. This enables functions such as multi-screen display, switching between different resolutions or refresh rates, and meeting diverse video display needs.

[0047] The CPSQ5206 chip is responsible for power management, providing a stable and reliable power supply for the entire system. Through an I2C connection, it can monitor and adjust the power supply of the ANX7443 chip in real time, ensuring it receives appropriate voltage and current under different operating modes and load conditions. This guarantees the stability and reliability of signal transmission, reducing signal distortion or transmission errors caused by power fluctuations.

[0048] Connecting the CPSQ5206 and ANX7443 chips via DPSEL and I2C can improve system integration to some extent, reduce the use of external components, and shrink the circuit board area, thus facilitating a more compact system design. Furthermore, this integrated design can reduce system costs and enhance product competitiveness.

[0049] The CPSQ5206 chip supports external clock synchronization, which avoids frequency interference and crosstalk. When connected to the ANX7443 chip, it can provide a more stable clock signal, thereby enhancing the integrity of the DisplayPort signal, reducing jitter and distortion during signal transmission, and improving the quality of video display.

[0050] Using I2C communication, the CPSQ5206 chip can monitor the operating status of the ANX7443 chip in real time, including parameters such as temperature and voltage. Upon detecting any anomalies, it can promptly issue alarms or take appropriate protective measures, such as reducing power consumption or cutting off power, to prevent chip damage and improve system reliability and stability. Simultaneously, this monitoring mechanism also facilitates rapid fault location and diagnosis, simplifying repair and maintenance.

[0051] Work process:

[0052] During video transmission, the video signal generated by the video source device (such as an in-vehicle camera) is first input to the ANX7443 chip. The USB / DisplayPort multiplexer within the ANX7443 chip identifies and processes the input signal, converting it into a signal format suitable for USB transmission. The chip also enhances and optimizes the signal to compensate for potential losses during transmission, ensuring signal quality and stability. The integrated clock source within the ANX7443 chip provides precise clock synchronization for video signal processing and transmission, ensuring that video data is transmitted in the correct timing sequence and avoiding issues such as flickering and distortion. The processed and synchronized video data is then encoded within the ANX7443 chip, converting it to USB 3.2 Gen2 or other compatible USB data formats. The encoded video data is then transmitted to the in-vehicle head unit via the USB interface. During transmission, the ANX7443 chip's retimer function re-timing and adjusting the signal to adapt to different transmission distances and channel conditions, further ensuring signal integrity. After receiving video data from the USB interface, the vehicle's onboard unit processes the data using the corresponding driver and hardware modules. The data is first decoded into its original video signal format, and then further processed by the onboard unit's video processing unit, including color correction, resolution adjustment, and image enhancement. The processed video signal is finally output to the vehicle's display screen for viewing, providing users with clear and smooth video images.

[0053] During the charging process, the power supplied by the vehicle's power system is first input to the CPSQ5206 chip. As a synchronous 4-switch buck-boost controller, the CPSQ5206 chip adjusts and converts the input power according to preset output voltage and current requirements. It supports a wide input voltage range of 3.8V to 36V and can provide a programmable output voltage of 2.0V to 36V with a resolution of 10mV to meet the charging needs of different devices. When the user connects a device to be charged (such as a mobile phone, tablet, etc.) to the vehicle's video transmission USB module via a USB interface, the module communicates with the device through the communication pins of the USB interface to identify the charging protocols supported by the device, such as PD3.0PPS, QC4.0, BC1.2, and DCP protocols. The CPSQ5206 chip limits and adjusts the output current according to the charging protocol, the device's requirements, and its own protection mechanisms. When the output current exceeds the set value or an abnormal situation such as a short circuit is detected, the chip immediately takes protective measures, such as reducing the output current or cutting off the output power, to prevent device damage and safety accidents. During charging, the CPSQ5206 chip monitors parameters such as output voltage, current, and temperature in real time and feeds this information back to the vehicle's onboard unit or relevant charging management system. The onboard unit can then display the charging status and progress to the user based on this information, and can also adjust and control the charging process as needed. When the device is fully charged or the user actively disconnects, the CPSQ5206 chip stops outputting current, cutting off power to the device and completing the charging process.

[0054] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A USB interface for an in-vehicle video transmission module, characterized in that, include: USB interface (1), video transmission chip (2) and vehicle host (3); USB interface (1) is a Type-C interface; The video transmission chip (2) is an ANX7443 chip. The video transmission chip (2) is connected to the USB interface (1) through the MainLink channel and the auxiliary channel. The vehicle host (3) and the video transmission chip (2) are connected via the MainLink channel and the auxiliary channel.

2. The USB interface for an in-vehicle video transmission module according to claim 1, characterized in that: The USB interface (1) is equipped with a USB 2.0 differential signal transmission channel for transmitting USB 2.0 data signals.

3. The USB interface for an in-vehicle video transmission module according to claim 1, characterized in that: The video transmission chip (2) is equipped with a DC power input pin VDD33.

4. The in-vehicle video transmission module USB interface according to claim 1, characterized in that: Both the video transmission chip (2) and the vehicle host (3) are equipped with hot-swap detection HPD1.

5. The USB interface for an in-vehicle video transmission module according to claim 1, characterized in that, Also includes: The power management chip (4) is a CPSQ5206 chip. The power management chip (4) is connected to the USB interface (1) through pins CC1 and CC2. The power management chip (4) is connected to the VBUS on the USB interface (1) through current transmission.

6. The USB interface for an in-vehicle video transmission module according to claim 5, characterized in that: The power management chip (4) has a DC power input pin VDD5.

7. The USB interface for an in-vehicle video transmission module according to claim 4, characterized in that: The power management chip (4) and the video transmission chip (2) are connected to the DPSEL signal via the I2C channel.

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