Vehicle-mounted equipment with wireless charging function

Abstract

The utility model provides vehicle-mounted equipment with a wireless charging function. The vehicle-mounted equipment comprises a shell, a wireless charging circuit, a multimedia projection screen circuit and an interface module, the wireless charging circuit, the multimedia projection screen circuit and the interface module are arranged in the shell; the interface module comprises a power supply input end and a USB signal end; the wireless charging circuit and the multimedia projection screen circuit are electrically connected with the power supply input end respectively; and the multimedia projection screen circuit is also electrically connected with the USB signal end. Through the vehicle-mounted equipment, a user can realize wireless communication connection between the intelligent mobile terminal and the vehicle-mounted terminal in an old automobile which only supports data line connection and has a multimedia screen projection function, so that an application on the intelligent mobile equipment is projected to a central control display screen of the vehicle-mounted terminal for use, and the interactivity of the old vehicle-mounted terminal is enhanced; meanwhile, the vehicle-mounted equipment can be used for wirelessly charging the intelligent mobile equipment, so that the trouble of wired charging is eliminated.

Description

Technical Field

[0001] This utility model relates to the field of automotive parts technology, specifically to an in-vehicle device with wireless charging function. Background Technology

[0002] Wireless charging technology, also known as wireless power transfer technology, uses electromagnetic induction / electromagnetic resonance / capacitive coupling to wirelessly transmit electrical energy from the transmitter to the receiver, thus charging various electronic devices such as smartphones and smartwatches.

[0003] A multimedia projection device refers to a device that supports multimedia projection functions (such as Apple CarPlay, HiCar, etc.). Through this device, the car's built-in system, which previously required a data cable connection for multimedia projection, can wirelessly connect to the user's smart device (such as a mobile phone). This allows applications from the smart device to be projected onto the car's central control screen for display and control, providing users with navigation, communication, music, and other app services from the smart device on the central control screen, thus offering a more convenient and intelligent driving experience.

[0004] In existing technologies, wireless charging devices and multimedia projection devices are two independent devices that need to be connected to the vehicle's infotainment system and charging port via separate transmission cables. This easily leads to tangled cables and messy cable arrangement, affecting not only usability and aesthetics but also potentially interfering with driver operation. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a vehicle-mounted device with wireless charging function, which can integrate wireless charging function and multimedia projection function to optimize the user experience.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0007] A vehicle-mounted device with wireless charging capability includes a housing, a wireless charging circuit, a multimedia projection circuit, and an interface module; the wireless charging circuit, the multimedia projection circuit, and the interface module are disposed within the housing.

[0008] The interface module includes a power input terminal and a USB signal terminal; the wireless charging circuit and the multimedia projection circuit are electrically connected to the power input terminal respectively; the multimedia projection circuit is also electrically connected to the USB signal terminal.

[0009] In a preferred embodiment, the interface module is a Type-C interface module.

[0010] In a preferred embodiment, the system further includes a power data cable and a USB signal cable; one end of the power data cable is electrically connected to the power input terminal, and the other end is a vehicle charging interface; one end of the USB signal cable is electrically connected to the USB signal terminal, and the other end is a USB interface.

[0011] In a preferred embodiment, the power data cable and the USB signal cable are encapsulated in a single data cable; one end of the data cable is a Type-C interface, which encapsulates one end of the power data cable and one end of the USB signal cable; the other end of the data cable is split into two parts, one end being the vehicle charging interface of the power data cable and the other end being the USB interface of the USB signal cable.

[0012] In a preferred embodiment, a magnetic bead is also included; the wireless charging circuit is electrically connected to the power input terminal via the magnetic bead, and / or the multimedia projection circuit is electrically connected to the power input terminal via the magnetic bead.

[0013] In a preferred embodiment, the wireless charging circuit includes a power transmitting module; the power transmitting module is disposed close to the surface of the housing.

[0014] As a preferred embodiment, the multimedia projection circuit is a Car Play projection protocol circuit, an Android Auto projection protocol circuit, a Hi Car projection protocol circuit, or a Car life projection protocol circuit.

[0015] In a preferred embodiment, the multimedia projection circuit is a CarPlay projection protocol circuit, including a multimedia processor, a Bluetooth / WiFi dual-band module, and a DC-DC conversion module; the Bluetooth / WiFi dual-band module is electrically connected to the DC-DC conversion module; the multimedia processor is also electrically connected to the USB signal terminal through the DC-DC conversion module.

[0016] In a preferred embodiment, the wireless charging circuit includes a power control IC, a PD protocol module, a boost module, a buck module, a decoding module, a sampling module, a driving and switching module, and a power transmission module.

[0017] The PD protocol module is electrically connected to the power input terminal and the power control IC, respectively; the input terminal of the boost module is electrically connected to the power control IC and the power input terminal, respectively, and its output terminal is electrically connected to the buck module and the drive and switching module, respectively; the decoding module is electrically connected to the power control IC, the buck module, the power transmission module and the sampling module, respectively; the drive and switching module is also electrically connected to the power control IC, the power transmission module and the sampling module, respectively.

[0018] In a preferred embodiment, the wireless charging circuit further includes an EMC module, an overvoltage protection module, and an NTC module; the NTC module is electrically connected to the power control IC; the overvoltage protection module is electrically connected to the power control IC, the boost module, and the buck module respectively; and the EMC module is electrically connected to the decoding module and the power transmitting module respectively.

[0019] The beneficial effects of this utility model are as follows: It provides an in-vehicle device that integrates multimedia projection and wireless charging functions. Through this device, users can not only achieve wireless communication between their smart mobile terminals and the vehicle's infotainment system in older cars that only support wired connections for multimedia projection, allowing them to project applications from their smart mobile devices onto the vehicle's central control display screen for use, thus enhancing the interactivity of older in-vehicle systems; simultaneously, the device can also wirelessly charge smart mobile devices, eliminating the hassle of wired charging. Therefore, this utility model, through multi-functional integration, can greatly improve the user experience; it can also reduce the use of cables in the vehicle's infotainment system, optimizing the aesthetics of the interior while improving driving safety. Attached Figure Description

[0020] Figure 1 A schematic diagram of the structure of a vehicle-mounted device with wireless charging function provided in the first embodiment of this utility model. Figure 1 ;

[0021] Figure 2 A schematic diagram of the structure of a vehicle-mounted device with wireless charging function provided in the first embodiment of this utility model. Figure 2 ;

[0022] Figure 3 An example diagram of a single data cable used in a vehicle-mounted device with wireless charging function, provided as the first embodiment of this utility model;

[0023] Figure 4 The circuit diagrams for a vehicle-mounted device with wireless charging function provided in the second to fourth embodiments of this utility model are shown.

[0024] Label Explanation:

[0025] 1. Housing; 2. Wireless charging circuit; 3. Multimedia projection circuit; 4. Interface module;

[0026] 5. Includes a data cable;

[0027] 41. Power input terminal; 42. USB signal terminal;

[0028] 51. Type-C interface; 52. Car charging interface; 53. USB interface. Detailed Implementation

[0029] To illustrate in detail the possible application scenarios, technical principles, implementable specific solutions, and achievable objectives and effects of this utility model, the following detailed description is provided in conjunction with the listed specific embodiments and accompanying drawings. The embodiments described herein are merely illustrative of the technical solutions of this utility model and are therefore intended to limit the scope of protection of this utility model.

[0030] In this document, the term "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The term "embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment, nor does it specifically limit its independence or connection with other embodiments. In principle, in this application, as long as there are no technical contradictions or conflicts, the technical features mentioned in each embodiment can be combined in any way to form corresponding implementable technical solutions.

[0031] Unless otherwise defined, the technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the use of related terms herein is merely for the purpose of describing particular embodiments and is not intended to limit this application.

[0032] In the description of this utility model, the term "and / or" is used to describe the logical relationship between objects, indicating that three relationships can exist. For example, A and / or B means: A exists, B exists, and A and B exist simultaneously. Additionally, the character " / " generally indicates that the preceding and following objects have an "or" logical relationship.

[0033] In this invention, terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any actual quantity, hierarchy, or order relationship between these entities or operations.

[0034] Without further limitations, the use of terms such as “comprising,” “including,” “having,” or other similar expressions in this invention is intended to cover non-exclusive inclusion, which does not exclude the presence of additional elements in a process, method, or product that includes the stated elements, such that a process, method, or product that includes a series of elements may include not only those defined elements but also other elements not expressly listed, or elements inherent to such a process, method, or product.

[0035] Similar to the understanding in the Examination Guidelines, in this utility model, expressions such as "greater than," "less than," and "exceeding" are understood to exclude the stated number; expressions such as "above," "below," and "within" are understood to include the stated number. Furthermore, in the description of the embodiments of this utility model, "multiple" means two or more (including two), and similar expressions related to "multiple" are also understood in this way, such as "multiple groups" and "multiple times," unless otherwise explicitly specified.

[0036] In the description of the embodiments of this utility model, the space-related expressions used, such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "vertical," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," indicate the orientation or positional relationship based on the orientation or positional relationship shown in the specific embodiments or drawings. They are only for the convenience of describing the specific embodiments of this utility model or for the reader's understanding, and do not indicate or imply that the device or component referred to must have a specific position, a specific orientation, or be constructed or operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model.

[0037] Unless otherwise expressly specified or limited, the terms "installation," "connection," "linking," "fixing," and "setting," as used in the description of the embodiments of this utility model, should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral setting; it can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two components or the interaction between two components. For those skilled in the art to which this utility model pertains, the specific meaning of the above terms in the embodiments of this utility model can be understood according to the specific circumstances.

[0038] Please refer to Figures 1 to 3 The first embodiment provided in this example is:

[0039] This embodiment provides a vehicle-mounted device with wireless charging function, including a housing 1, a wireless charging circuit 2, a multimedia projection circuit 3, and an interface module 4; the wireless charging circuit 2, the multimedia projection circuit 3, and the interface module 4 are disposed within the housing 1.

[0040] The interface module 4 includes a power input terminal 41 and a USB signal terminal 42; the wireless charging circuit 2 and the multimedia projection circuit 3 are electrically connected to the power input terminal 41 respectively; the multimedia projection circuit 3 is also electrically connected to the USB signal terminal 42.

[0041] The wireless charging circuit 2 can be any circuit design capable of providing wireless charging functionality, such as electromagnetic induction wireless charging circuits, magnetic resonance wireless charging circuits, radio wave wireless charging circuits, and electric field coupling wireless charging circuits. In some specific embodiments, the wireless charging circuit can be implemented using chips such as the HUSB368 and HUSB238A from Huinengtai, the AOZ73016QI from AOS, and the high-voltage linear step-down device from Fangzhou Microelectronics. In this embodiment, the wireless charging circuit enables the vehicle-mounted device to support wireless charging functionality, allowing for wireless charging of smart mobile devices.

[0042] The multimedia projection circuit 3 can be a Car Play projection protocol circuit, an Android Auto projection protocol circuit, a Hi Car projection protocol circuit, or a Car life projection protocol circuit. That is, its multimedia circuit configuration can respectively implement the corresponding Car Play projection protocol, Android Auto projection protocol, Hi Car projection protocol, or Car life projection protocol, so that the in-vehicle device of this embodiment supports the multimedia projection function. It can realize the wireless communication connection between the smart mobile terminal and the vehicle system in older cars that only support the multimedia projection function of data cable connection, so as to project the application on the smart mobile device to the central control display screen of the vehicle system for use, thereby enhancing the interactivity of older car systems. In some specific implementations, the multimedia projection circuit can be directly selected from chips such as Allwinner V851S / 821 / F133 / A133 / T113 / H618 series chips, RK3326 / 3528 series chips, Qualcomm 6125 / 6115 / 6225 / 2290 series chips, or MTK6765 / 6762 / 6739 / 6735 / 8163 series chips, or corresponding chips from chip manufacturers such as Guoke Microelectronics, Ingenic Semiconductor, Kaiyang Semiconductor, and Atmel.

[0043] The interface module 4 is used to provide external connection interfaces for the wireless charging circuit 2 and the multimedia projection circuit 3, so as to provide power input for the wireless charging circuit 2 and the multimedia projection circuit 3 and to provide signal input for the multimedia projection circuit 3.

[0044] The in-vehicle device provided in this embodiment is specifically designed for older cars that require a data cable connection for multimedia projection. However, the USB ports on these older cars are primarily designed for data transfer, not charging. Their output current is too low (below 0.5A) and the voltage is unstable, making it difficult to meet the charging current requirements for smart mobile devices (which require at least 1A for normal charging). In other words, the USB ports on older cars do not support charging smart mobile devices; they can generally only obtain charging power through the cigarette lighter socket. Therefore, as... Figure 2 As shown, the in-vehicle device provided in this embodiment has an interface module 4 that includes a power input terminal 41 and a USB signal terminal 42. The power input terminal 41 is used to connect to the cigarette lighter interface of the vehicle to transmit charging power; the USB signal terminal 42 is used to connect to the USB interface of the vehicle to transmit multimedia projection data.

[0045] In some specific embodiments of this example, the power input terminal 41 and the USB signal terminal 42 in the interface module 4 can be integrated into a single Type-C interface, meaning the interface module is a Type-C interface module. It is understood that the Type-C interface supports multiple charging protocols, such as the USB PD protocol, for fast charging; it also supports high-speed data transmission, such as the USB 3.1 Gen 2 standard, with data transmission speeds up to 10Gbps, offering high data transmission efficiency; and it also has the advantage of a smaller interface, making it more suitable for thinner devices. Therefore, the vehicle-mounted device only needs a single interface to complete both charging power transmission and data transmission functions, offering higher integration and greater convenience.

[0046] Accordingly, if the vehicle-mounted equipment also includes a matching data cable, such as Figure 3As shown, the supporting data cable 5 is shaped like a single data cable, internally encapsulating a power data cable and a USB signal cable. One end of the power data cable 5 and one end of the USB signal cable are encapsulated into a Type-C interface 51, serving as one end of the supporting data cable 5 for connection to the Type-C interface module of the vehicle device. Specifically, the power data cable in the Type-C interface of the supporting data cable 5 connects to the power input terminal 41 of the vehicle device, and the USB signal cable connects to the USB signal terminal 42. The other end of the supporting data cable 5 is divided into two heads, corresponding to the other ends of the power data cable and the USB signal cable, respectively, each corresponding to a different interface type. Specifically, the head corresponding to the power data cable is a vehicle charging interface 52, connected to the cigarette lighter interface on the vehicle's infotainment system to obtain power input; the head corresponding to the USB signal cable is a USB interface 53, connected to the vehicle's infotainment system to transmit multimedia projection data.

[0047] In some further specific embodiments of this implementation, the interface module 4 can also be designed with its own interfaces corresponding to the power input terminal 41 and the USB signal terminal 42. That is, the interface module includes a first USB interface corresponding to the power input terminal and a second USB interface corresponding to the USB signal terminal, to transmit power and multimedia projection data respectively. Here, although the vehicle-mounted device needs to be equipped with two interfaces, the two interfaces (cigarette lighter interface and USB interface) on the corresponding connected vehicle system are independent of each other. Since users usually already have the corresponding data cables, users can directly use the corresponding data cables for connection without being limited to specific data cables, thus maintaining operational convenience from other perspectives.

[0048] Accordingly, if the vehicle-mounted equipment also includes a data cable for use, such as Figure 2 As shown, the accompanying data cable includes two independent data cables: a power data cable and a USB signal cable. One end of the power data cable has a USB interface for electrical connection to the power input terminal, and the other end is a car charging interface for connecting to the vehicle's cigarette lighter socket. One end of the USB signal cable has a USB interface for electrical connection to the USB signal terminal, and the other end is a USB interface for connecting to the vehicle's USB interface.

[0049] In some specific embodiments of this implementation, the USB data line between the USB signal terminal and the multimedia projection circuit in the interface module, and / or the USB signal line used to connect the USB signal terminal of the vehicle device to the vehicle's USB interface, all adopt a twisted pair design to improve the stability and anti-interference capability of USB signal transmission.

[0050] The working principle of the vehicle-mounted device with wireless charging function provided in this embodiment is as follows:

[0051] By connecting one end of the data cable to the interface module of the in-vehicle device in this embodiment, and the other end to the cigarette lighter socket and USB port on the vehicle's infotainment system respectively, a wired connection between the in-vehicle device and the vehicle's infotainment system is achieved. The power provided by the cigarette lighter socket on the vehicle's infotainment system can provide charging power to the wireless charging circuit of the in-vehicle device, and also provide operating power to the multimedia projection circuit of the in-vehicle device. When a smart mobile terminal, such as a mobile phone, is brought close to a designated position on the casing of the in-vehicle device, the wireless charging circuit inside the in-vehicle device can wirelessly charge the mobile phone. After a successful wireless communication connection is established between the smart mobile terminal, such as a mobile phone, and the multimedia projection circuit inside the in-vehicle device, the mobile phone interface will be rendered as a video stream and transmitted in real time to the multimedia projection circuit of the in-vehicle device through the wireless communication connection. Then, the in-vehicle device will transmit it to the central control display screen of the vehicle's infotainment system for display via the USB signal line of the data cable. At the same time, the user's control commands on the mobile phone will also be transmitted to the vehicle's infotainment system for synchronous control through the above communication lines, and the user's touch operations / physical controls on the central control display screen will also be transmitted to the mobile phone for synchronous control through the above communication lines, thereby realizing two-way interaction and multi-screen interaction.

[0052] Please refer to Figure 4 Embodiment two of this utility model is as follows:

[0053] This embodiment is a further extension of Embodiment 1. Specifically, this embodiment provides an in-vehicle device with wireless charging functionality, which also includes a magnetic bead; the wireless charging circuit is electrically connected to the power input terminal via the magnetic bead, and / or the multimedia projection circuit is electrically connected to the power input terminal via the magnetic bead.

[0054] In this embodiment, since the wireless charging circuit and the multimedia projection circuit in the vehicle-mounted device share a power input terminal, in order to ensure that the power supply operation of the wireless charging circuit and the multimedia projection circuit does not interfere with each other, a ferrite bead is specially set between the two circuits to play an isolation role in electromagnetic wave filtering, thereby reducing mutual interference and noise between the two circuits.

[0055] In some specific implementations, such as Figure 4 As shown, the wireless charging circuit and the power input terminal, the multimedia projection circuit and the power input terminal, and the power input terminal and the ground terminal can all be connected by ferrite beads to avoid interference.

[0056] Preferably, the wireless charging circuit is also equipped with an EMC module; the EMC module can also absorb excess electromagnetic energy in the circuit to further reduce noise and interference in the circuit and optimize the circuit reliability of the vehicle equipment.

[0057] Please refer to Figure 4 Embodiment three of this utility model is as follows:

[0058] This embodiment is a further extension of any of the above embodiments. Specifically, this embodiment provides a vehicle-mounted device with wireless charging functionality, wherein the wireless charging circuit can be... Figure 4 The yellow-background module in the structure specifically includes a power control IC, a PD protocol module, a boost module, a buck module, a decoding module, a sampling module, a drive and switching module, and a power transmission module; the power transmission module is positioned close to the surface of the vehicle-mounted equipment housing. Preferably, it is positioned below the inner surface of the upper part of the housing.

[0059] like Figure 4 As shown, the PD protocol module is electrically connected to the power input terminal and the power control IC, respectively, and is used to control the power input terminal to convert the input 5VDC voltage into a 9VDC voltage output; the input terminal of the boost module is electrically connected to the power control IC and the power input terminal, respectively, and its output terminal is electrically connected to the buck module and the drive and switching module, respectively; the decoding module is electrically connected to the power control IC, the buck module, the power transmission module and the sampling module, respectively; the drive and switching module is also electrically connected to the power control IC, the power transmission module and the sampling module, respectively.

[0060] Optionally, the power control IC is implemented using a power chip of model XL1508; the boost module is a boost converter of model CRMQTL0312AD; the drive and switching module is a drive switch of model CRMRGL0612AD; in addition, the wireless charging circuit has a power of 15W and an operating frequency of 105-200KHz and 360KHz.

[0061] In some specific embodiments, the step-down module specifically includes a first step-down unit for stepping down to 5V and a second step-down unit for stepping down to 1.8V; the power control IC, the first step-down unit, the second step-down unit, and the decoding circuit are electrically connected in sequence.

[0062] In some specific embodiments, the wireless charging circuit further includes an EMC module, an overvoltage protection module, and an NTC module; the NTC module is electrically connected to the power control IC; the overvoltage protection module is electrically connected to the power control IC, the boost module, and the buck module respectively; and the EMC module is electrically connected to the decoding module and the power transmitting module respectively.

[0063] The working principle of the wireless charging circuit is as follows:

[0064] After the vehicle charging interface of the in-vehicle device is connected to the cigarette lighter interface of the vehicle, the 12VDC voltage output from the cigarette lighter interface will be converted into 5VDC voltage through the vehicle charging interface and then output. After the 5VDC voltage is input to the power input terminal in the interface module, the power input terminal will output 9VDC voltage to the wireless charging circuit and the multimedia projection circuit under the control / spoofing of the PD protocol module.

[0065] After the 9VDC voltage output from the power input terminal arrives at the power control IC, the crystal oscillator is powered on to generate the main frequency for the power control IC to work; the power control IC controls the boost module (BOOST) through the built-in pre-drive (PWM drive signal) to boost the 9V voltage to 12-15V, and power the drive and switching modules.

[0066] The power control IC will also step down the received 9V output to 5V through the step-down module LDO, and then step it down to 1.8V before outputting it to the decoding module. Both the power control IC and the boost module are connected to an overvoltage protection module. When the voltage exceeds the set voltage, the protection will be activated and the entire circuit will stop working. It can only work normally after the voltage is restored.

[0067] When the device being charged (such as a mobile phone) is a standard 15W device, the frequency is between 148-150KHz; when the device being charged is an MPP 15W device, the frequency is 360KHz. The device being charged sends a signal to the power control IC after analysis by the decoding module and the sampling module. The output signal (i.e., the power control IC decodes and outputs the signal by detecting the current through the coil) is then sent to the drive and switching module to perform frequency switching (i.e., the main control XL1508 decodes and outputs the signal by detecting the current through the coil). The resonant capacitor is different for different frequencies.

[0068] When the power transmission module is working, it will radiate electromagnetic energy; the EMC module corrects the electromagnetic energy so that it does not exceed the wireless charging standard.

[0069] When the sampling module detects excessive current, it triggers the circuit protection mechanism to protect the wireless charging circuit and the device being charged from being damaged or burned out. When the mainboard operating temperature of the wireless charging circuit reaches a preset temperature, such as 80 degrees Celsius, the NTC module starts up and the power begins to decrease. When the temperature returns to the preset temperature, such as 45 degrees Celsius, the power returns to normal.

[0070] It should be noted that the power supply for the wireless charging circuit and the multimedia projection circuit share the same power input (9V), meaning both are obtained from the power input terminal in the interface module of the vehicle-mounted device. Therefore, ferrite beads are used to isolate the power supplies of the wireless charging circuit and the multimedia projection circuit from ground, ensuring that their power supply operation does not interfere with each other. Additionally, the EMC circuit in the wireless charging circuit absorbs excess electromagnetic energy, further reducing its impact on the multimedia projection circuit.

[0071] Please refer to Figure 4 Embodiment four of this utility model is as follows:

[0072] This embodiment is a further extension of any of the above embodiments. Specifically, this embodiment provides an in-vehicle device with wireless charging functionality, whose multimedia projection circuit is a CarPlay projection protocol circuit, i.e., a circuit configuration that enables CarPlay projection functionality based on the CarPlay projection protocol. In this embodiment, the CarPlay projection protocol circuit can be... Figure 4 The green-based module in the middle consists of the multimedia processor, the Bluetooth / WiFi dual-band module, and the DC-DC conversion module; the Bluetooth / WiFi dual-band module is electrically connected to the DC-DC conversion module; the multimedia processor is also electrically connected to the USB signal terminal through the DC-DC conversion module.

[0073] In some specific implementations, the multimedia processor may be an Allwinner V851 processor to provide higher performance, lower power consumption, more functions, and broader compatibility in multimedia data processing.

[0074] In some specific implementations, the Bluetooth / WiFi dual-band module can be a Realtek 8733BS model Bluetooth + Wi-Fi dual-function communication module to provide faster and more stable wireless signal transmission, as well as lower power consumption and stronger network adaptability. Specifically, the Bluetooth / WiFi dual-band module consumes only 0.75W, supports Wi-Fi bands of 5150-5250MHz, 5725-5850MHz, and 2412-2472MHz, and supports Bluetooth connectivity version 4.2 and above.

[0075] In some specific embodiments, the DC-DC conversion module is a three-channel DC-DC conversion module, providing three DC outputs of 3.1V, 1.5V, and 0.9V to the multimedia processor, and providing a DC output to the Bluetooth / WiFi dual-band module. The DC-DC conversion module is used to convert the input voltage into the operating voltage required by the multimedia processor and the Bluetooth / WiFi dual-band module, ensuring their normal operation. Here, the DC-DC conversion module can convert one DC voltage into multiple DC voltages to meet the power requirements of the multimedia processor and the Bluetooth / WiFi dual-band module; at the same time, the output voltage has higher stability and higher conversion efficiency.

[0076] The working principle of the multimedia projection circuit provided in this embodiment is as follows:

[0077] The 9V power supply voltage output from the power input terminal of the interface module of the vehicle-mounted equipment is transmitted to the DC-DC conversion module; the DC-DC conversion module converts the 9V power supply voltage into the operating voltage required by the multimedia projection circuit and the Bluetooth WiFi dual-band module, ensuring that they can work normally.

[0078] After the in-vehicle device is connected to the vehicle's head unit via a USB signal cable, it uses the USB communication protocol to simulate the wired connection signal of a mobile phone. This causes the vehicle's head unit to mistakenly believe that a mobile phone has been connected via a data cable. The in-vehicle system then communicates with the multimedia projection circuit in the connected in-vehicle device using a specific protocol (such as CarPlay, Android Auto, etc.). The multimedia processor built into the multimedia projection circuit parses these protocols and converts them into the format required for wireless transmission. Then, it wirelessly transmits the data to the mobile phone through the Bluetooth / WiFi dual-band module.

[0079] In this system, a wireless communication connection will be pre-established between the mobile phone and the in-vehicle device. Upon first use, the multimedia projection circuit in the in-vehicle device will quickly pair with the mobile phone via the Bluetooth / WiFi dual-band module and establish a Bluetooth wireless transmission link for transmitting basic control commands triggered by the user on the mobile phone, such as clicking to pair or confirming the use of CarPlay. After a successful Bluetooth handshake between the mobile phone and the in-vehicle device, the multimedia projection circuit in the in-vehicle device will establish a Wi-Fi wireless transmission link (usually based on the 5GHz band) with the mobile phone via the Bluetooth / WiFi dual-band module for transmitting high-bandwidth data, such as navigation, phone calls, and audio / video streams. Furthermore, the mobile phone and the in-vehicle device can achieve direct Wi-Fi connection without relying on the vehicle's Wi-Fi or an external router.

[0080] The interaction between the mobile phone and the in-vehicle equipment includes:

[0081] (1) Data transmission and processing

[0082] 1. Audio / video streaming:

[0083] The phone renders the CarPlay or Android Auto interface as a video stream, then compresses and transmits it in real-time to the in-vehicle device via Wi-Fi. The in-vehicle device's multimedia projection circuit receives the video stream via a Bluetooth / Wi-Fi dual-band module and transmits it to the multimedia processor. The multimedia processor decodes the video stream and transmits it to the USB signal terminal of the in-vehicle device's interface module. The in-vehicle device then transmits the data to the vehicle's central control display screen via a USB signal cable for display. Similarly, audio data (such as music and navigation prompts) from the phone is also synchronously transmitted to the vehicle's audio system via the same transmission path and processing method.

[0084] 2. Control signal interaction:

[0085] The user's touch operation or physical button command on the vehicle's central control display screen is transmitted to the multimedia projection circuit of the vehicle device via USB signal cable for processing; then it is transmitted back to the mobile phone via Wi-Fi through the Bluetooth WiFi dual-band module, thereby realizing two-way interaction (such as swiping, clicking, etc.) and multi-screen interaction.

[0086] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent modifications made based on the content of this utility model specification and drawings, or direct or indirect applications in related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A vehicle-mounted device with wireless charging capability, characterized in that, It includes a housing, a wireless charging circuit, a multimedia projection circuit, and an interface module; the wireless charging circuit, the multimedia projection circuit, and the interface module are disposed within the housing. The interface module includes a power input terminal and a USB signal terminal; the wireless charging circuit and the multimedia projection circuit are electrically connected to the power input terminal respectively; the multimedia projection circuit is also electrically connected to the USB signal terminal.

2. The vehicle-mounted device with wireless charging function as described in claim 1, characterized in that, The interface module is a Type-C interface module.

3. A vehicle-mounted device with wireless charging function as described in claim 1, characterized in that, It also includes a power data cable and a USB signal cable; one end of the power data cable is electrically connected to the power input terminal, and the other end is a vehicle charging interface; one end of the USB signal cable is electrically connected to the USB signal terminal, and the other end is a USB interface.

4. A vehicle-mounted device with wireless charging function as described in claim 3, characterized in that, The power data cable and the USB signal cable are packaged in a single data cable; one end of the data cable is a Type-C interface, which encapsulates one end of the power data cable and one end of the USB signal cable; the other end of the data cable is split into two parts, one end being the vehicle charging interface of the power data cable and the other end being the USB interface of the USB signal cable.

5. A vehicle-mounted device with wireless charging function as described in claim 1, characterized in that, It also includes a magnetic bead; the wireless charging circuit is electrically connected to the power input terminal through the magnetic bead, and / or the multimedia projection circuit is electrically connected to the power input terminal through the magnetic bead.

6. A vehicle-mounted device with wireless charging function as described in claim 1, characterized in that, The wireless charging circuit includes a power transmitting module; the power transmitting module is disposed close to the surface of the housing.

7. A vehicle-mounted device with wireless charging function as described in claim 1, characterized in that, The multimedia projection circuit is a Car Play projection protocol circuit, an Android Auto projection protocol circuit, a Hi Car projection protocol circuit, or a Carlife projection protocol circuit.

8. A vehicle-mounted device with wireless charging function as described in claim 7, characterized in that, The multimedia projection circuit is a CarPlay projection protocol circuit, including a multimedia processor, a Bluetooth / WiFi dual-band module, and a DC-DC conversion module; the Bluetooth / WiFi dual-band module is electrically connected to the DC-DC conversion module; the multimedia processor is also electrically connected to the USB signal terminal through the DC-DC conversion module.

9. A vehicle-mounted device with wireless charging function as described in claim 1, characterized in that, The wireless charging circuit includes a power control IC, a PD protocol module, a boost module, a buck module, a decoding module, a sampling module, a driving and switching module, and a power transmission module. The PD protocol module is electrically connected to the power input terminal and the power control IC, respectively; the input terminal of the boost module is electrically connected to the power control IC and the power input terminal, respectively, and its output terminal is electrically connected to the buck module and the drive and switching module, respectively; the decoding module is electrically connected to the power control IC, the buck module, the power transmission module and the sampling module, respectively; the drive and switching module is also electrically connected to the power control IC, the power transmission module and the sampling module, respectively.

10. A vehicle-mounted device with wireless charging function as described in claim 9, characterized in that, The wireless charging circuit also includes an EMC module, an overvoltage protection module, and an NTC module; the NTC module is electrically connected to the power control IC; the overvoltage protection module is electrically connected to the power control IC, the boost module, and the buck module; and the EMC module is electrically connected to the decoding module and the power transmission module.

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