A vehicle-mounted wireless charger with card protection function and a control method thereof

Abstract

The application relates to the technical field of wireless charging, and discloses a vehicle-mounted wireless charger with card protection function and a control method thereof. The vehicle-mounted wireless charger comprises a wireless charging unit and a near field communication control unit, and a near field communication MCU of the near field communication control unit is in communication connection with a seat charging MCU in the wireless charging unit. The near field communication MCU is used for detecting whether an NFC card exists in the induction range of a near field communication coil. When the NFC card is detected, the near field communication MCU is used for controlling the wireless charging coil to stop charging. The wireless charging unit and the near field communication control unit work independently, effectively improving the stability and safety of the system, avoiding the burning of the NFC card in the process of WPC wireless charging, and avoiding the mutual interference of the wireless charging and the NFC function and the potential safety hazards caused by the mutual interference. Since the near field communication control unit has an independent MCU and communicates with the wireless charging power supply, the independent operation and efficient response of the NFC function are ensured, and the user experience is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wireless charging, in particular to a vehicle-mounted wireless charger with card protection function and a control method thereof. BACKGROUND

[0002] With the development of new energy vehicles, WPC (Wireless Power Consortium) wireless charging and NFC (Near Field Communication) card starting function are more and more widely used in new energy vehicles. Generally, two functions are configured in the area near the central control armrest, one is to swipe the RFID card to start the vehicle, and the other is to place a mobile phone with wireless charging function to perform wireless charging.

[0003] In the existing vehicle-mounted wireless charging technology, the integration of WPC wireless charging function and NFC function often has many problems. The common problem is that the WPC wireless charging process may burn the NFC card, and the WPC wireless charging function and the NFC function may interfere with each other. For example, when any one of the WPC wireless charging function and the NFC function fails, the implementation of the other function will be affected. Therefore, it is necessary to improve the existing technology.

[0004] The above information is given as background information only to assist with an understanding of the present disclosure, and does not constitute admission or recognition that any of the above information constitutes prior art with respect to the present disclosure. SUMMARY

[0005] The present application provides a vehicle-mounted wireless charger with card protection function and a control method thereof to solve the problems in the prior art.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0007] A vehicle-mounted wireless charger with card protection function, comprising:

[0008] a wireless charging unit, the wireless charging unit comprising a wireless charging coil and a seat charging MCU connected to the wireless charging coil;

[0009] a near field communication control unit, the near field communication control unit comprising a near field communication coil and a near field communication MCU connected to the near field communication coil, the near field communication MCU being in communication connection with the seat charging MCU;

[0010] The near field communication MCU is configured to detect whether an NFC card exists in the induction range of the near field communication coil, and when an NFC card is detected, the near field communication MCU is configured to control the wireless charging coil to stop charging.

[0011] In a possible implementation, the wireless charging unit comprises a first charging coil and a second charging coil, the first charging coil is connected with a first charging MCU, the second charging coil is connected with a second charging MCU, and the near field communication MCU is in communication connection with the first charging MCU and / or the second charging MCU.

[0012] In a possible implementation, the near field communication unit comprises a first near field communication coil and a second near field communication coil, and the first near field communication coil and the second near field communication coil are jointly connected to the near field communication MCU.

[0013] The near field communication MCU is configured to detect, in a polling manner, whether an NFC card exists in the induction range of the first near field communication coil and the second near field communication coil respectively.

[0014] When the NFC card exists in the induction range of the first near field communication coil and / or the second near field communication coil, the near field communication MCU is configured to control the corresponding first charging coil or the second charging coil to stop charging.

[0015] In a possible implementation, the near field communication MCU is further configured to:

[0016] When it is detected that the NFC card does not exist in the induction range of the first near field communication coil and / or the second near field communication coil, the near field communication MCU is configured to control the corresponding first charging coil or the second charging coil to restart charging.

[0017] In a possible implementation, the near field communication MCU is further configured to: when it is continuously detected that the NFC card does not exist in the induction range of the first near field communication coil and / or the second near field communication coil within a preset detection duration, control the corresponding first charging coil or the second charging coil to restart charging.

[0018] In a possible implementation, the near field communication control unit further comprises a near field communication circuit board.

[0019] The bottom layer of the near field communication circuit board is provided with a resistance component and a single-side grounded EMC shielding net, and the resistance component and the EMC shielding net are both located above the wireless charging coil; the line width of the EMC shielding net is 0.5 mm, and the line distance of the EMC shielding net is 0.5 mm.

[0020] The top layer of the near field communication circuit board is provided with an NFC antenna, the NFC antenna comprises two or more coils, the inner diameters of the coils are sequentially from large to small, the coil with the smallest inner diameter is sleeved in the coil with the largest inner diameter, and the coil with the largest inner diameter at least covers the wireless charging coil in the projection on the plane of the wireless charging coil.

[0021] In a possible implementation, the wireless charging unit further comprises a seat charging support for fixing the product being charged, and further comprises a cooling fan connected to the seat charging MCU, and an air outlet of the cooling fan is arranged towards the product being charged.

[0022] In a possible implementation, the near field communication control unit interacts with the car machine through a CAN protocol, and the wireless charging unit interacts with the car machine through a LIN protocol.

[0023] In another aspect, the application further provides a control method of the vehicle-mounted wireless charger with the card protection function, and the control method is implemented based on the vehicle-mounted wireless charger with the card protection function according to any one of the above.

[0024] The control method comprises the following steps.

[0025] Detecting whether an NFC card exists in an induction range of the near field communication coil.

[0026] When the NFC card is detected, controlling the wireless charging coil to stop charging.

[0027] In a possible implementation, the control method further comprises the following steps.

[0028] Detecting, in a polling manner, whether an NFC card exists in an induction range of the first near field communication coil and the second near field communication coil respectively.

[0029] When the NFC card exists in the induction range of the first near field communication coil and / or the second near field communication coil, controlling the corresponding first seat charging coil or second seat charging coil to stop charging.

[0030] When the NFC card is continuously not detected in the induction range of the first near field communication coil and / or the second near field communication coil within a preset detection duration, controlling the corresponding first seat charging coil or second seat charging coil to restart charging.

[0031] Compared with the prior art, the application has the following beneficial effects.

[0032] The vehicle-mounted wireless charger with the card protection function and the control method thereof provided by the application can effectively improve the stability and safety of the system by making the wireless charging unit and the near field communication control unit have independent MCUs, so that the wireless charging unit and the near field communication control unit can work independently, avoid the NFC card from being burnt during the WPC wireless charging process, and avoid the mutual interference between the wireless charging and the NFC function and the potential safety hazards caused by the mutual interference.

[0033] The present application has other characteristics and advantages that will be apparent from or explained in the accompanying drawings and subsequent detailed description, which together serve to illustrate specific principles of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0035] Figure 1 is a connection architecture diagram of a near field communication MCU and a seat charging MCU in a vehicle-mounted wireless charger with card protection function provided by embodiment one of the present application;

[0036] Figure 2 is a flowchart of detecting whether there is an NFC card in the sensing range of the first near field communication coil and the second near field communication coil respectively in a polling manner in a vehicle-mounted wireless charger with card protection function provided by embodiment one of the present application;

[0037] Figure 3 is a sectional view of a vehicle-mounted wireless charger with card protection function provided by embodiment one of the present application;

[0038] Figure 4 is a structural schematic diagram of an EMC shielding net in a vehicle-mounted wireless charger with card protection function provided by embodiment one of the present application;

[0039] Figure 5 is a structural schematic diagram of an NFC antenna in a vehicle-mounted wireless charger with card protection function provided by embodiment one of the present application;

[0040] Figure 6 is a flowchart of a control method of a vehicle-mounted wireless charger with card protection function provided by embodiment two of the present application.

[0041] Corresponding reference signs: 10, near field communication unit; 11, near field communication chip; 12, first near field communication coil; 13, second near field communication coil; 14, near field communication MCU; 15, near field communication circuit board; 20, wireless charging unit; 211, first seat charging coil; 212, first seat charging MCU; 221, second seat charging coil; 222, second seat charging MCU. DETAILED DESCRIPTION

[0042] To explain possible application scenarios, technical principles, specific implementation schemes, and the purposes and effects of the present application in detail, the following embodiments are described in conjunction with the accompanying drawings. The embodiments described herein are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0043] In this paper, the term "embodiment" means that the specific features, structures or characteristics described in conjunction with the embodiment can be included in at least one embodiment of the present application. The term "embodiment" appearing at various places in the specification does not necessarily refer to the same embodiment, and does not particularly limit its independence or association with other embodiments. In principle, in the present application, as long as there is no technical contradiction or conflict, the technical features mentioned in each embodiment can be combined in any way to form a corresponding implementable technical solution.

[0044] Unless otherwise defined, the meaning of the technical terms used herein is the same as that generally understood by those skilled in the art to which the present application belongs; the use of related terms herein is only for the purpose of describing specific embodiments, and is not intended to limit the present application.

[0045] In the description of the present application, the phrase "and / or" is a description of the logical relationship between the objects, which means that there can be three relationships, for example, A and / or B, which means that there are three cases: A exists, B exists, and A and B exist at the same time. In addition, the character " / " in this paper generally represents that the associated objects before and after are a "or" logical relationship.

[0046] In the present application, terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual quantity, primary and secondary or order relationship between the entities or operations.

[0047] Without more limitations, in the present application, the phrases "include", "include", "have" or other similar expressions used in the sentence are intended to cover non-exclusive inclusion, and these expressions do not exclude the presence of other elements in the process, method or product including the described elements, so that the process, method or product including a series of elements can not only include those limited elements, but also include other elements not explicitly listed, or also include elements inherent to such process, method or product.

[0048] As the same understanding in the "Examination Guidelines", in this application, "greater than", "less than", "exceed" and other expressions are understood as not including the number; "above", "below", "within" and other expressions are understood as including the number. In addition, in the description of the embodiments of the present application, the meaning of "multiple" is more than two (including two), and similar expressions related to "multiple" are also understood in this way, for example, "multiple groups", "multiple times" and the like, unless otherwise explicitly specified.

[0049] In the description of the embodiments of the present application, the spatially related expressions used, such as "center", "longitudinal", "transverse", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "vertical", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the specific embodiment or the drawing, and is only for the convenience of describing the specific embodiments of the present application or for the reader to understand, and does not indicate or imply that the indicated device or component must have a specific position, a specific orientation, or be constructed or operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0050] Unless otherwise explicitly specified or limited, in the description of the embodiments of the present application, the terms "mount", "connect", "connect", "fix", "set", and the like should be broadly understood. For example, the "connection" can be a fixed connection, or a detachable connection, or an integral setting; it can be a mechanical connection, or an electrical connection, or a communication connection; it can be directly connected, or indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art to which the present application belongs, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0051] Embodiment one

[0052] The present embodiment provides a vehicle-mounted wireless charger with card protection function, which comprises a wireless charging unit 20 and a near field communication control unit. Please refer to Figure 1 , the connection architecture diagram of the near field communication MCU 14 and the seat charge MCU in the vehicle-mounted wireless charger with card protection function provided in the present embodiment.

[0053] The wireless charging unit 20 includes a wireless charging coil and a seat charge MCU connected to the wireless charging coil. Among them, the wireless charging coil is used to realize the wireless charging function of mobile phones and other devices, and the seat charge MCU is responsible for controlling and adjusting various parameters in the charging process, such as charging current and charging voltage, etc., to ensure the safety and efficiency of charging.

[0054] The near field communication control unit includes a near field communication coil and a near field communication MCU 14 connected to the near field communication coil. The near field communication coil is used to detect the presence of an NFC card, and the near field communication MCU 14 is responsible for detecting and processing signals from the near field communication coil.

[0055] In this embodiment, the near field communication MCU 14 and the seat charging MCU are in communication. When the near field communication MCU 14 detects the presence of an NFC card within the sensing range of the near field communication coil, it sends an instruction to the seat charging MCU to control the wireless charging coil to stop charging, thereby avoiding interference or damage to the NFC card.

[0056] Further, in this embodiment, the wireless charging unit 20 includes a first seat charging coil 211 and a second seat charging coil 221, and the first seat charging coil 211 and the second seat charging coil 221 are respectively connected to a first seat charging MCU 212 and a second seat charging MCU 222. In addition, the near field communication MCU 14 is in communication with the first seat charging MCU 212 and the second seat charging MCU 222.

[0057] For example, when the first seat charging coil 211 is located at the driver's seat and the second seat charging coil 221 is located at the passenger's seat, the wireless charging seat charging at both the driver's seat and the passenger's seat can be independently started and stopped, thereby improving the safety and stability of the entire system.

[0058] Further, the near field communication unit 10 includes a first near field communication coil 12 and a second near field communication coil 13, which are connected to a near field communication MCU 14.

[0059] In this embodiment, the wireless charging unit 20 and the near field communication control unit are independently operated for vehicle functional safety. The wireless charging unit 20 uses two MCUs to control the seat charging on both sides of the driver and passenger, and the near field communication control unit has an independent near field communication MCU 14, which is a CC2642. Specifically, the near field communication MCU 14 is externally connected to a near field communication chip 11, which is an ST25R3920B. In this embodiment, a single-ended architecture is used, i.e., a one-to-two structure, and one near field communication chip 11 drives two NFC coils simultaneously. The near field communication MCU 14 communicates with the seat charging MCU through I2C and GPIO to achieve clock synchronization.

[0060] The architecture provided by the embodiment has the advantages of high functional safety performance, high reliability and high safety, and does not need to rely on the reliability of a single MCU, for example, when the seat charging MCU fails, the vehicle can still be started normally by card swiping. In addition, since the digital key involves vehicle and owner information, the security requirement is high, therefore, the NFC channel works independently, which is more in line with the actual application scenario.

[0061] It can be understood that the embodiment uses a near field communication chip 11 and adopts a single-ended architecture, realizes that one near field communication chip 11 drives two coils, and is used for detecting whether an NFC card exists in the driver seat or the front passenger seat, and discontinues wireless charging of the corresponding seat.

[0062] In the embodiment, the near field communication MCU 14 is used to detect whether an NFC card exists in the sensing range of the first near field communication coil 12 and the second near field communication coil 13 in a polling manner; when an NFC card exists in the sensing range of the first near field communication coil 12 and / or the second near field communication coil 13, the near field communication MCU 14 is used to control the corresponding first seat charging coil 211 or the second seat charging coil 221 to stop charging.

[0063] Please refer to Figure 2 , which is a flowchart for detecting whether an NFC card exists in the sensing range of the first near field communication coil 12 and the second near field communication coil 13 in a polling manner in the embodiment. For example, the first near field communication coil 12 is detected first, an RF field is generated by the NFC card reader to send a card reading instruction, and whether a card responds is detected, if a card responds, it means that an NFC card exists in the sensing range of the first near field communication coil 12; when it is detected that an NFC card exists in the sensing range of the first near field communication coil 12, the near field communication MCU 14 controls the corresponding first seat charging coil 211 to stop charging, for example, interrupts a signal in the near field communication MCU 14, and informs the corresponding first seat charging coil 211 to stop charging through I2C; then, the second near field communication coil 13 is detected in the same way, when it is detected that an NFC card exists in the sensing range of the second near field communication coil 13, the near field communication MCU 14 controls the corresponding second seat charging coil 221 to stop charging; through the above steps, the first seat charging coil 211 and the second seat charging coil 221 are controlled accurately through the above steps.

[0064] It can be understood that, due to the wheeling scheme card reading time will be extended, so in practical application can be optimized to support the card type to shorten the card reading time. In the prior art, NFC card is divided into A card, B card, F card and different card types, different card types are used in different areas, such as F card is mainly used in Japanese market, and A card and B card are mainly used in domestic market. Then for the domestic market vehicle, by improving the software to achieve the purpose of reading A card and B card, the card reading response time is improved.

[0065] In addition, the near field communication MCU 14 also has the function of controlling the seat charging coil to restart charging when no NFC card is detected. Specifically, if no NFC card is detected in the inductive range of the first near field communication coil 12 and the second near field communication coil 13 for a preset detection time, the near field communication MCU 14 will control the corresponding seat charging coil to restart charging to restore the wireless charging function.

[0066] When no NFC card is detected, continue charging; when an NFC card is detected, stop charging, and continue to detect whether there is an NFC card, if the NFC card is continuously detected, maintain the charging, until the NFC card is detected to be taken away, and whether there is an NFC card is detected within a preset detection time, if no NFC card is detected within the detection time, resume charging.

[0067] Please refer to Figure 3 , the cross-sectional view of the vehicle wireless charger, the near field communication control unit further includes a near field communication circuit board, which is connected to the main board of the charger through a connector, and the wireless charging coil is below the near field communication circuit board. The wireless charging coil is supported on the main board by a ferrite and a metal sheet, so that the radiation direction is upward, and some low-frequency signals radiated by the main board can be shielded.

[0068] The bottom layer of the near field communication circuit board is provided with a resistance component and a single-sided ground EMC shielding net, which are located above the wireless charging coil.

[0069] Among them, please refer to Figure 4 , the structure diagram of the EMC shielding net; the line width of the EMC shielding net is 0.5mm, and the line spacing is 0.5mm. Such parameter setting can shield the high-order harmonic radiated directly by the wireless charging coil when the power is 50W, and will not form a closed loop to generate self-excitation current during charging, and the influence on the wireless charging efficiency is within 0.5%, so as to effectively shield electromagnetic interference while controlling the influence on the wireless charging efficiency within a small range.

[0070] The bottom layer of the near field communication circuit board is also integrated with four NTC resistors with a resistance of 10 Kohm. The NTC resistors are located directly above the wireless charging coil and are connected to the main board connector through a 10 PIN connector. The NTC resistors are used to detect the temperature of the wireless charging and play a protective role. The four NTC resistors are 0402 package. The 0402 package is a common surface mount technology (SMT) component package size identifier. The "04" indicates that the length of the component is about 0.04 inches (1.00 mm), and the "02" indicates that the width of the component is about 0.02 inches (0.50 mm). This package size is small and suitable for high-density electronic circuit design, which can save space on the circuit board and is commonly used in small electronic products such as mobile phones, tablets, and laptops.

[0071] The top layer of the near field communication circuit board is provided with an NFC antenna. Please refer to Figure 5 for a structural diagram of the NFC antenna. The antenna includes multiple coils, and the inner diameters of the coils decrease in turn from large to small. The coil with the smallest inner diameter is nested in the coil with the largest inner diameter, and the coil with the largest inner diameter at least covers the wireless charging coil in the projection on the plane. This design can improve the inductive sensitivity and coverage of the NFC antenna, ensuring accurate identification of various types of NFC cards.

[0072] Please refer to Table 1 below. In this embodiment, the wireless charging efficiency can reach 76.6%, the NFC card reading distance is 4.5 cm, and the EMC harmonic margin is 5 dB.

[0073]

[0074] In addition, the wireless charging unit 20 also includes a seat charging support seat for fixing the charged product, and a cooling fan located below the seat charging support seat. Specifically, the cooling fan is a centrifugal fan. The cooling fan is connected to the seat charging MCU, and the air outlet of the cooling fan is arranged towards the charged product for cooling the charged product. The speed of the cooling fan can be adjusted by the seat charging MCU according to the temperature during the charging process, thereby effectively reducing the temperature of the charged device and improving the charging efficiency and safety. It has been verified that the cooling fan provided in this embodiment can control the temperature of the charged product within 38℃.

[0075] Taking a mobile phone as an example:

[0076] In an alternative embodiment, the seat charging support seat has a wedge-shaped support structure, such as a wedge-shaped pad for elevating the mobile phone. When the mobile phone is placed on the wedge-shaped pad, it is in an inclined manner, so that the air flow generated by the cooling fan can fully act on the back of the mobile phone, creating conditions for enhancing the convective cooling of the mobile phone.

[0077] In another alternative embodiment, the seat support seat has a recess for placing the mobile phone, and the air outlet airflow of the cooling fan acts on the back of the mobile phone and is parallel to the back of the mobile phone to fully take away the heat of the mobile phone.

[0078] In terms of communication protocol, the near field communication control unit interacts with the vehicle machine through CAN protocol, and the wireless charging unit 20 interacts with the vehicle machine through LIN protocol. Such design enables efficient and stable communication between the two units and the vehicle system, and realizes the cooperative work of various functions.

[0079] The charger provided by the embodiment has the following beneficial effects:

[0080] 1. Architecture design innovation: NFC path and WPC path work independently, and I2C communication is used to realize card detection and charging interruption. The independent working mode meets the requirements of vehicle function safety and host factory for vehicle and owner information security protection, greatly improves the stability and safety of the system, and avoids the mutual interference between wireless charging and NFC function and the potential safety hazards caused thereby.

[0081] 2. The NFC adopts a single-ended architecture, which can accurately detect whether the left or right wireless charging has an NFC card and interrupt the charging of the corresponding coil, thereby realizing more accurate control and improving user experience.

[0082] 3. The NFC coil antenna adopts a low-cost PCB antenna form, and the NTC resistor and EMC shielding net are integrated on the bottom layer of the PCB antenna board. By adjusting the width and spacing of the EMC shielding net, the WPC charging efficiency and NFC card reading distance are considered, and the NTC temperature protection function is realized, thereby effectively reducing the cost and improving the comprehensive performance of the system.

[0083] 4. By detecting the NFC card and interrupting and resuming the wireless charging, the working process of the entire charger is more stable and reliable.

[0084] 5. The centrifugal fan actively cools to ensure that the temperature of the mobile phone back cover is always less than 38℃, so that the wireless charging does not stop working due to internal heating of the machine during operation, prolongs the service life of the equipment, and improves the stability of the charging.

[0085] Embodiment Two

[0086] Based on the foregoing embodiment, the embodiment provides a control method of a vehicle-mounted wireless charger with card protection function, which is realized based on the vehicle-mounted wireless charger with card protection function described above. Please refer to Figure 6 The control method comprises the following steps:

[0087] S1, detecting whether an NFC card exists in the sensing range of the near field communication coil;

[0088] S2, when the NFC card is detected, control the wireless charging coil to stop charging,

[0089] First, detect whether there is an NFC card in the induction range of the near field communication coil. The detection process can be achieved by continuously monitoring the signal changes of the near field communication coil by the near field communication MCU 14.

[0090] When the NFC card is detected, control the wireless charging coil to stop charging. The specific control instruction is sent by the near field communication MCU 14 to the seat charging MCU, and the seat charging MCU stops the charging operation of the wireless charging coil immediately after receiving the instruction.

[0091] Next, detect whether there is an NFC card in the induction range of the first near field communication coil 12 and the second near field communication coil 13 respectively in a polling manner. The polling time interval can be set according to actual needs to ensure timely detection of the presence of the NFC card.

[0092] When the induction range of the first near field communication coil 12 and / or the second near field communication coil 13 has an NFC card, control the corresponding first seat charging coil 211 or second seat charging coil 221 to stop charging.

[0093] If the induction range of the first near field communication coil 12 and / or the second near field communication coil 13 has not been detected to have an NFC card for a preset detection duration, control the corresponding first seat charging coil 211 or second seat charging coil 221 to restart charging. The preset detection duration can be set according to actual conditions, such as 5 seconds, 10 seconds, etc., to balance the charging efficiency and safety.

[0094] Through the above specific embodiments and control methods, the vehicle-mounted wireless charger with card protection function and the control method thereof provided by the present application can effectively solve the problems existing in the prior art, improve the stability, safety and user experience of the system.

[0095] Finally, it should be noted that although the above embodiments have been described in the specification and drawings of the present application, they do not limit the patent protection scope of the present application. Any equivalent structure or equivalent flow replacement or modification based on the essential concept of the present application, using the content described in the specification and drawings, and directly or indirectly implementing the technical solutions of the above embodiments in other related technical fields, etc. are all included in the patent protection scope of the present application.

Claims

1. A vehicle-mounted wireless charger with card protection function, characterized in that, include: A wireless charging unit, the wireless charging unit including a wireless charging coil and a charging MCU connected to the wireless charging coil; A near-field communication control unit, comprising a near-field communication coil and a near-field communication MCU connected to the near-field communication coil, wherein the near-field communication MCU is communicatively connected to the charging dock MCU; The near-field communication MCU is used to detect whether an NFC card exists within the sensing range of the near-field communication coil; when an NFC card is detected, the near-field communication MCU is used to control the wireless charging coil to stop charging. The wireless charging unit includes a first charging coil and a second charging coil. A first charging MCU is connected to the first charging coil, and a second charging MCU is connected to the second charging coil. The near-field communication MCU communicates with the first charging MCU and / or the second charging MCU. The near-field communication control unit also includes a near-field communication circuit board; The bottom layer of the near-field communication circuit board is provided with a resistor assembly and a single-sided grounded EMC shielding mesh, both of which are located above the wireless charging coil; the line width of the EMC shielding mesh is 0.5mm, and the line spacing of the EMC shielding mesh is 0.5mm. The top layer of the near-field communication circuit board is provided with an NFC antenna, which includes two or more coils. The inner diameters of the coils decrease sequentially, with the smaller inner diameter coil nested inside the larger inner diameter coil. The projection of the largest inner diameter coil onto the plane where the wireless charging coil is located at least covers the wireless charging coil.

2. The vehicle-mounted wireless charger with card protection function according to claim 1, characterized in that, The near-field communication control unit includes a first near-field communication coil and a second near-field communication coil, and the first near-field communication coil and the second near-field communication coil are connected to a near-field communication MCU. The near-field communication MCU is used to detect, in a polling manner, whether an NFC card exists within the sensing range of the first near-field communication coil and the second near-field communication coil; When an NFC card is present within the sensing range of the first near-field communication coil and / or the second near-field communication coil, the near-field communication MCU controls the corresponding first charging coil or second charging coil to stop charging.

3. The vehicle-mounted wireless charger with card protection function according to claim 2, characterized in that, The near-field communication MCU is also used for: When no NFC card is detected within the sensing range of the first near-field communication coil and / or the second near-field communication coil, the corresponding first charging coil or the second charging coil is controlled to restart charging.

4. The vehicle-mounted wireless charger with card protection function according to claim 2 or 3, characterized in that, The near-field communication MCU is also used to: control the corresponding first charging coil or second charging coil to restart charging when no NFC card is detected within the sensing range of the first near-field communication coil and / or the second near-field communication coil within a preset detection time.

5. The vehicle-mounted wireless charger with card protection function according to claim 1, characterized in that, The wireless charging unit also includes a charging stand for fixing the product being charged, and a cooling fan connected to the charging MCU, with the air outlet of the cooling fan facing the product being charged.

6. The vehicle-mounted wireless charger with card protection function according to claim 1, characterized in that, The near-field communication control unit interacts with the vehicle's infotainment system via the CAN protocol, and the wireless charging unit interacts with the vehicle's infotainment system via the LIN protocol.

7. A control method for a vehicle-mounted wireless charger with card protection function, characterized in that, Based on the vehicle-mounted wireless charger with card protection function as described in any one of claims 1 to 6; The control method includes: Detect whether an NFC card exists within the sensing range of the near-field communication coil; When an NFC card is detected, the wireless charging coil is controlled to stop charging.

8. The control method for a vehicle-mounted wireless charger with card protection function according to claim 7, characterized in that, The near-field communication control unit includes a first near-field communication coil and a second near-field communication coil; The control method further includes: The presence of an NFC card within the sensing range of the first and second near-field communication coils is detected by polling. When an NFC card is present within the sensing range of the first near-field communication coil and / or the second near-field communication coil, control the corresponding first charging coil or the second charging coil to stop charging; If no NFC card is detected within the sensing range of the first near-field communication coil and / or the second near-field communication coil within the preset detection time, the corresponding first charging coil or the second charging coil will be controlled to restart charging.

Images