Vehicle-mounted wireless charging module

Abstract

The invention discloses a vehicle-mounted wireless charging module which is composed of a digital key system and a charging system. Wherein the digital key system at least comprises an antenna radiator and an antenna PCB (Printed Circuit Board), the antenna radiator is arranged on the antenna PCB, and a blank area is arranged at the center of the antenna radiator; the charging system at least comprises a power transmitting coil which is located at the bottom of the antenna PCB, and a main body part of the power transmitting coil is located in the blank area; after the digital key system detects a corresponding digital key, the charging system is in a working state; and the working frequency of the digital key system is different from that of the charging system. According to the technical scheme, two systems are integrated and do not interfere with each other, and the function of the digital key has better card swiping efficiency.

Description

Technical Field

[0001] The invention relates to automotive electronics, and in particular to a vehicle-mounted wireless charging module. Background Art

[0002] Traditional vehicles require a physical car key to start, which is inconvenient to carry. With the development of technology, some vehicles can use digital keys (NFC keys) to swipe cards at designated locations to start the vehicle. This method requires swiping the card at a specific location, which has a poor experience, and some products have blind spots for swiping and checking the card. At the same time, the overall magnetic field radiation is uneven and the intensity is weak, and the card swiping height is low, that is, you need to get close to swipe the card.

[0003] At present, integrating digital keys into mobile phones has become the latest solution. With the help of the mobile phone's built-in NFC, Bluetooth and other functions, digital keys have become more flexible and convenient. However, how to ensure that mobile phones integrated with digital keys do not affect each other during wireless charging, and how to better realize the functions of digital keys are problems that need to be solved urgently. Summary of the invention

[0004] The present invention provides a vehicle-mounted wireless charging module, which is composed of a digital key system and a charging system; wherein the digital key system at least includes: an antenna radiator and an antenna PCB board, the antenna radiator is on the antenna PCB board, and a blank area is provided at the center of the antenna radiator; the charging system at least includes: a power transmitting coil, which is located at the bottom of the antenna PCB board, and the main body is located in the blank area; the charging system is in an operable state only after the digital key system detects a corresponding digital key; and the operating frequency of the digital key system is different from the operating frequency of the charging system.

[0005] Preferably, the digital key system has at least two modes: start detection and gear shift detection;

[0006] The start-up detection is: when the vehicle is not started, the vehicle is started after the corresponding digital key is detected; the gear shifting detection is: it is started at least when the brake signal is received, the digital key system begins detection, and gear shifting is allowed after the corresponding digital key is detected.

[0007] Preferably, the startup detection also includes: when the vehicle is not started, after detecting the corresponding digital key, further determining whether there is a signal to unlock the door since the last time the engine was turned off, and if so, starting the vehicle.

[0008] Preferably, when it is detected that the vehicle is in the parking gear, the digital key system is started, and after detecting the corresponding digital key, a forgotten reminder is issued.

[0009] Preferably, the routing of the antenna radiator is wound clockwise from the inside to the outside, and the spacing between adjacent routings is greater than 5mm; the antenna radiator is wound in a square shape, with right-angle corners at the corners; when the number of the antenna radiators is greater than or equal to 2, the distance between two adjacent antenna radiators is less than or equal to 1mm; the outer side of the antenna radiator is 5mm±2mm away from the frame of the antenna PCB board.

[0010] Preferably, when the number of the antenna radiators is greater than or equal to 2, the size and routing direction of each of the antenna radiators are the same.

[0011] Preferably, the antenna radiator is a printed trace;

[0012] The antenna radiators are printed on both the upper and lower surfaces of the antenna PCB board, which are an upper radiator and a lower radiator respectively, and the position of the upper radiator wiring corresponds to the gap position between the lower radiator wiring.

[0013] Preferably, at least the lower radiator is covered with a protective layer; and the outside of the protective layer covering the lower radiator is covered with a shielding coating.

[0014] Preferably, when the antenna radiator is wound, a giving way inclined portion is formed to avoid line overlap, and the giving way inclined portion has an inclination angle of 45°±10°;

[0015] The starting portion of the antenna radiator is located inside the giving way inclined portion, and the ending portion of the antenna radiator is located outside the giving way inclined portion.

[0016] Preferably, the operating frequency of the antenna radiator is 13.56 MHz.

[0017] The technical solution of the present application integrates two systems without interfering with each other, and the digital key function has better card swiping efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Schematic diagram of the vehicle-mounted wireless charging module

[0019] Figure 2 This is a schematic diagram of the digital key system in the vehicle wireless charging module;

[0020] Figure 3 This is a comparison diagram of the magnetic field distribution of the digital key system in the vehicle wireless charging module and the existing solutions. DETAILED DESCRIPTION

[0021] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be interpreted as limiting the present invention.

[0022] The present invention provides a vehicle-mounted wireless charging module, hereinafter referred to as a module, see Figure 1 ,This module integrates at least two systems - the digital key system and the charging system (here refers to the wireless charging system). The two systems share a placement area, which refers to the area where the mobile phone is placed. Placing the mobile phone in this area can both charge wirelessly and realize the function of the digital key. Of course, the two systems can work independently. For example, if the digital key used is not a mobile phone, placing it in this area can complete the function of starting the vehicle with the digital key; for another example, a mobile phone without an integrated digital key can also be wirelessly charged when placed in this area.

[0023] The digital key module is used to identify the digital key, and at least comprises: an antenna radiator 1 and an antenna PCB board 2. The antenna radiator 1 has a blank area at the center of the antenna radiator 1 on the antenna PCB board 2. The blank area is reserved for the charging system.

[0024] The charging system at least includes: a power transmitting coil 3, which is located at the bottom of the antenna PCB board 2, and the main body is in the blank area.

[0025] The charging system is in working state only after the digital key system detects the corresponding digital key. This is also easy to understand. Only after the digital key system detects the corresponding digital key can the vehicle be started and the charging system can connect to the power start function.

[0026] The digital key system has at least two modes: start detection and gear shift detection.

[0027] As the name implies, startup detection is a detection when the vehicle needs to be started, and the purpose is to ignite the vehicle. This mode is: when the vehicle is not started, after the corresponding digital key is detected, the vehicle is started. In some preferred embodiments, when the vehicle is not started, after the corresponding digital key is detected, it is further determined whether there is a signal to unlock the door since the last time the engine was turned off, and if so, the vehicle is started. The purpose of judging whether there is an unlocked door here is to determine whether a driver has entered the vehicle, so as to avoid the vehicle being started all the time because the mobile phone is left in the car. When the mobile phone is left behind, the digital key system can always detect the presence of the digital key, resulting in inaccurate judgment. And judging whether there is an action to unlock the door can well determine whether someone is on the car, especially the door on the driver's side. If it is unlocked or opened, it is considered that the driver is on the car and has a driving demand.

[0028] The gear shift detection is to determine whether the current conditions meet the requirements of vehicle movement. Whether it is forward gear or reverse gear, it is an action that the gear shift detection needs to monitor. Generally, the gear shift detection occurs at the first gear shift action after the vehicle is started.

[0029] The gear shift detection is: at least when the brake signal is received, the digital key system starts to detect, and after detecting the corresponding digital key, the gear shift is allowed. Generally, gear shifting requires the braking action, so detecting the brake signal means that there is a need to shift gears. The reason why the digital key system needs to be started is to allow the driver to get off the vehicle temporarily after getting in and starting the vehicle. In this case, if someone in the vehicle accidentally touches the gear shift button, it will be dangerous, so a gear shift detection is required.

[0030] In addition, there can also be a left-behind detection. When the vehicle is detected to be in parking gear, the digital key system starts, and after detecting the corresponding digital key, a left-behind reminder is issued. Of course, the left-behind reminder can also be implemented by the charging system. The reason why both systems can be implemented here is based on the digital key being integrated into the mobile phone. When the two are not integrated, the mobile phone left-behind reminder is generally completed by the charging system.

[0031] Furthermore, regarding the setting method of the digital key system, the basic requirement is to provide a stable and uniform electromagnetic field to make the "swipe card" action smooth and have a high recognition rate. Here, "swipe card" refers to the process of identifying digital keys. Because digital keys appeared in the form of cards in the early days, "swipe card" was used. This does not limit the digital key to the form of a "card". In addition, it is also necessary to ensure that the electromagnetic field of the digital key system does not affect the operation of the charging system.

[0032] In order to meet the above requirements, the vehicle-mounted wireless charging module includes: an antenna radiator 1 and an antenna PCB board 2. The antenna radiator 1 is on the antenna PCB board 2, and the routing method is clockwise from the inside to the outside. Here, it is generally implemented by printed routing, and the spacing between adjacent routings is greater than 5mm; the antenna radiator 1 is coiled in a square shape, with right-angle corners at the corners; there is a blank area at the center of the antenna radiator 1. When the number of antenna radiators 1 is greater than or equal to 2, the distance between two adjacent antenna radiators 1 is less than or equal to 1mm. The limitation is that there are two or three antenna radiators 1. When there is only one antenna radiator 1, this limitation does not exist. When there are two or more antenna radiators 1, the size and routing direction of each antenna radiator 1 are the same.

[0033] The outer side of the antenna radiator 1 is 5mm±2mm away from the frame of the antenna PCB board 2. If there is only one antenna radiator 1, it means that the outermost circle of the only antenna radiator 1 is 5mm±2mm away from the frame of the antenna PCB board 2. When there are multiple antenna radiators 1, it means that the distance from the outer circle of the antenna radiator 1 closest to the frame of the antenna PCB board 2 to the frame is 5mm±2mm. For example, when there are three antenna radiators 1, they are placed in parallel and they are at the same distance from one of the frames of the antenna PCB board 2, then they all need to meet the 5mm±2mm requirement.

[0034] Preferably, there are two antenna radiators 1, and they are arranged side by side on the left and right. The antenna PCB board 2 is rectangular, and the distance between the upper and lower frames of the two antenna radiators 1 and the antenna PCB board 2 is 5mm±2mm; the distance between the left antenna radiator 1 and the left frame of the antenna PCB board 2 is 5mm±2mm; the distance between the right antenna radiator 1 and the right frame of the antenna PCB board 2 is 5mm±2mm.

[0035] The routing of the antenna radiator 1 has at least one layer, preferably 2-4 layers, which can be on the same side of the PCB antenna board 2 or can be printed on both sides.

[0036] In one embodiment, the antenna radiator 1 is printed on both the upper and lower surfaces of the PCB board 2, that is, its routing is realized by printing routing. For the convenience of description, the antenna radiator 1 printed on both sides is called the upper radiator and the lower radiator, and the position of the upper radiator routing corresponds to the gap position between the lower radiator routing.

[0037] That is, the upper radiator and the lower radiator are not completely corresponding, but staggered corresponding, where the staggered correspondence means that the routing and the gap correspond to achieve the staggered routing on both sides. In this way, the magnetic field radiation can be more uniform.

[0038] Preferably, at least the lower radiator is covered with a protective layer, and the outer surface of the protective layer covering the lower radiator is covered with a shielding coating.

[0039] When the antenna radiator 1 is coiled, a relief inclined portion 11 is formed to avoid line overlap, and the relief inclined portion 11 has an inclination angle of 45°±10°. The starting portion of the antenna radiator 1 is inside the relief inclined portion 11, and the ending portion of the antenna radiator 1 is outside the relief inclined portion 11. The operating frequency of the antenna radiator 1 is 13.56MHz. The operating frequency of the charging system is about 100KHz.

[0040] Preferably, the device is integrated on a mobile phone wireless charger, and the digital key is integrated in the mobile phone. By placing the mobile phone in a corresponding position, the vehicle can be unlocked and the mobile phone can also be wirelessly charged at the same time.

[0041] In order to realize wireless charging, a power transmitting coil is also required. The power transmitting coil is arranged on the bottom surface of the antenna PCB board 2, and the central area of ​​the power transmitting coil is in the blank area of ​​the antenna radiator 1, so that the shielding of the power transmitting coil is minimized and the two do not interfere with each other.

[0042] Of course, in actual work, the vehicle can only operate wireless charging normally after being unlocked by the digital key. Under normal circumstances, the two will not interfere with each other. Figure 3 , is a comparison of the magnetic field strength of the vehicle-mounted wireless charging module of this application with the magnetic field strength in the prior art. The result reflected by the magnetic field strength in the figure is visualized as an isosceles triangle, with the field strength of the base of the triangle being 0 and the field strength of the vertex being 1. It can be seen intuitively that the magnetic field strength range of this solution (i.e., the coverage range of the base of the triangle) is significantly larger than that of the prior art, which solves the problem of blind spots in the prior art, thereby eliminating the blind spot for card swiping. The top of the triangle, which is the area with the largest magnetic field strength, is also more dispersed, so that the effective card swiping area is larger, thus providing a better card swiping experience.

[0043] The above describes in detail the structure, features and effects of the present invention based on the embodiments shown in the drawings. The above is only a preferred embodiment of the present invention, but the present invention is not limited to the scope of implementation shown in the drawings. Any changes made according to the concept of the present invention, or modifications to equivalent embodiments with equivalent changes, which still do not exceed the spirit covered by the description and drawings, should be within the protection scope of the present invention.

Claims

1. A vehicle-mounted wireless charging module, It is characterized in that It consists of a digital key system and a charging system; The digital key system at least includes: An antenna radiator (1) and an antenna PCB board (2), wherein the antenna radiator (1) is on the antenna PCB board (2) and has a blank area at the center of the antenna radiator (1); The charging system at least comprises: A power transmitting coil (3) is located at the bottom of the antenna PCB board (2), and the main body is located in the blank area; The charging system is in an operable state only after the digital key system detects the corresponding digital key; and the operating frequency of the digital key system is different from the operating frequency of the charging system.

2. The vehicle-mounted wireless charging module according to claim 1, It is characterized in that The digital key system has at least two modes: start detection and gear shift detection; Startup detection: when the vehicle is not started, the vehicle is started after the corresponding digital key is detected; The gear shifting detection is: it is activated at least when the brake signal is received, the digital key system starts the detection, and after the corresponding digital key is detected, the gear shifting is allowed.

3. The vehicle-mounted wireless charging module according to claim 2, It is characterized in that The startup detection also includes: when the vehicle is not started, after detecting the corresponding digital key, further determining whether there is a signal to unlock the door since the last time the engine was turned off, and if so, starting the vehicle.

4. The vehicle-mounted wireless charging module according to claim 1, It is characterized in that When it is detected that the vehicle is in the parking gear, the digital key system is activated, and after detecting the corresponding digital key, a forgotten reminder is issued.

5. The vehicle-mounted wireless charging module according to claim 1, It is characterized in that The antenna radiator (1) is arranged in a clockwise direction from inside to outside, and the spacing between adjacent lines is greater than 5 mm; the antenna radiator (1) is arranged in a square shape, and has right-angle corners at the corners; When the number of the antenna radiators (1) is greater than or equal to 2, the distance between two adjacent antenna radiators (1) is less than or equal to 1 mm; The distance between the outer side of the antenna radiator (1) and the frame of the antenna PCB board (2) is 5 mm±2 mm.

6. The vehicle-mounted wireless charging module according to claim 1, It is characterized in that When the number of the antenna radiators (1) is greater than or equal to 2, the size and routing direction of each of the antenna radiators (1) are the same.

7. The vehicle-mounted wireless charging module according to claim 1, It is characterized in that The antenna radiator (1) is a printed wiring; The antenna radiator (1) is printed on both the upper and lower surfaces of the antenna PCB board (2), which are an upper radiator and a lower radiator respectively, and the position of the upper radiator wiring corresponds to the gap position between the lower radiator wiring.

8. The vehicle-mounted wireless charging module according to claim 7, It is characterized in that At least the lower radiator is covered with a protective layer; The protection layer covering the lower radiator is covered with a shielding coating.

9. The vehicle-mounted wireless charging module according to any one of claims 5 to 8, It is characterized in that When the antenna radiator (1) is wound, a giving way inclined portion (11) is formed to avoid line overlap, and the giving way inclined portion (11) has an inclination angle of 45°±10°; The starting part of the antenna radiator (1) is located inside the giving way inclined part (11), and the ending part of the antenna radiator (1) is located outside the giving way inclined part (11).

10. The vehicle-mounted wireless charging module according to any one of claims 1 to 9, It is characterized in that The operating frequency of the antenna radiator (1) is 13.56 MHz.

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