Multi-device adaptive wireless charging pad

Abstract

The application discloses a multi-device adaptive wireless charging plate, which comprises a substrate, a coil array, a sensor array, an adjustable capacitance network and a central control unit. The coil array is arranged on the substrate and is composed of a plurality of planar spiral coils, which are laid in a hexagonal pattern to form a honeycomb layout. The sensor array comprises a plurality of Hall sensors, each of which is arranged at a corner of the substrate. Each adjustable capacitance network is electrically connected to each planar spiral coil in one-to-one correspondence. The central control unit is electrically connected to the adjustable capacitance network and the sensor array. The scheme can reduce the decline in charging efficiency caused by the deviation of the device placement position.

Description

Technical Field

[0001] This application relates to the field of wireless charging technology, specifically to a multi-device adaptive wireless charging pad. Background Technology

[0002] With the widespread adoption of portable electronic products such as mobile terminals, wearable devices, and wireless headphones, wireless charging, as a convenient energy transfer method, has gradually become an important supporting technology for consumer electronics. Currently, mainstream inductive wireless charging systems employ a design with a single or a few large-sized transmitting coils, or use several non-overlapping transmitting units to cover the charging surface, achieving energy transfer through near-field magnetic coupling between the coil and the receiving coil. Meanwhile, industry standards (such as Qi) have established basic protocol requirements for handshaking, power distribution, and safety protection, providing a unified foundation for the compatibility and intelligent management of wireless charging devices.

[0003] However, existing charging pads have a limited number of coils, and most are arranged in a rectangular or dispersed manner, resulting in insufficient coverage. When users place their devices in non-core areas of the pad, the coupling coils deviate excessively, significantly reducing charging efficiency. Utility Model Content

[0004] This application provides a multi-device adaptive wireless charging pad, which can reduce the decrease in charging efficiency caused by deviations in device placement.

[0005] This application provides a multi-device adaptive wireless charging pad, including:

[0006] substrate;

[0007] A coil array is disposed on the substrate, and the coil array is composed of multiple planar spiral coils, which are arranged in a hexagonal pattern to form a honeycomb layout.

[0008] A sensor array, comprising a plurality of Hall sensors, each of which is disposed at a corner of the substrate;

[0009] An adjustable capacitor network, wherein each of the adjustable capacitor networks is electrically connected to each of the planar helical coils in a one-to-one correspondence;

[0010] The central control unit is electrically connected to the adjustable capacitor network and the sensor array, respectively.

[0011] The multi-device adaptive wireless charging board provided in this application embodiment also includes a thermal management component, which is disposed on the side of the substrate.

[0012] In the multi-device adaptive wireless charging board provided in this application embodiment, the thermal management component includes a graphene-paraffin composite phase change material layer, two thermally conductive adhesive layers, and several heat dissipation fins. The graphene-paraffin composite phase change material layer is bonded to the substrate through the thermally conductive adhesive layers, and the several heat dissipation fins are bonded to the graphene-paraffin composite phase change material layer through the thermally conductive adhesive layers.

[0013] The multi-device adaptive wireless charging board provided in this application embodiment also includes a switching circuit module that is configured one-to-one with the coil array, and each switching circuit module is electrically connected to the corresponding planar spiral coil.

[0014] In the multi-device adaptive wireless charging board provided in this application embodiment, the switching circuit module includes a field-effect transistor and a gate driver that cooperates with the field-effect transistor.

[0015] The multi-device adaptive wireless charging board provided in this application embodiment also includes a phase synchronization unit, which is electrically connected to the switching circuit module to coordinate the driving phase of the coil array.

[0016] In the multi-device adaptive wireless charging pad provided in this application embodiment, the adjustable capacitor network includes at least one set of capacitor units that can be connected in parallel or in series by switches. The capacitor units are selected to be connected or disconnected by the central control unit through digital control signals.

[0017] In the multi-device adaptive wireless charging pad provided in this application embodiment, the thickness of the graphene-paraffin composite phase change material layer is 0.5 mm, and the phase change temperature is 42°C.

[0018] In the multi-device adaptive wireless charging pad provided in this application embodiment, the diameter of each of the planar spiral coils is 3cm.

[0019] In the multi-device adaptive wireless charging board provided in the embodiments of this application, the thermal resistance of the thermally conductive adhesive layer is less than or equal to 0.8℃·cm2 / W.

[0020] In summary, the multi-device adaptive wireless charging board provided in this application includes a substrate, a coil array, a sensor array, an adjustable capacitor network, and a central control unit. The coil array is disposed on the substrate and consists of multiple planar spiral coils arranged in a hexagonal honeycomb pattern. The sensor array includes multiple Hall sensors, each located at a corner of the substrate. Each adjustable capacitor network is electrically connected to each planar spiral coil. The central control unit is electrically connected to both the adjustable capacitor network and the sensor array. This solution, by densely arranging multiple planar spiral coils in a hexagonal pattern on the substrate, can form a high-density coverage area within a limited area, increasing the effective charging surface and reducing the decrease in charging efficiency caused by device placement deviations. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the structure of the multi-device adaptive wireless charging pad provided in this application. Detailed Implementation

[0023] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0024] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, components, features, and elements with the same names in different embodiments of this application may have the same meaning or different meanings, the specific meaning of which must be determined by its interpretation in that specific embodiment or further in conjunction with the context of that specific embodiment.

[0025] It should be understood that the specific embodiments described herein are merely illustrative of this application and are not intended to limit this application.

[0026] In the following description, the use of suffixes such as "module," "part," or "unit" to denote elements is solely for the purpose of illustrative purposes and has no specific meaning in itself. Therefore, "module," "part," or "unit" may be used interchangeably.

[0027] The following describes in detail the embodiments involved in this application. It should be noted that the order of description of the embodiments in this application is not intended to limit the priority of the embodiments.

[0028] The technical solutions shown in this application will be described in detail below through specific embodiments. It should be noted that the order of description of the following embodiments is not intended to limit the priority of the embodiments.

[0029] Existing charging pads have a limited number of coils, and most are arranged in a rectangular or dispersed manner, resulting in insufficient coverage. When users place their devices in non-core areas of the pad, the coupling coils deviate excessively, significantly reducing charging efficiency.

[0030] Based on this, please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of the multi-device adaptive wireless charging board provided in this application. The multi-device adaptive wireless charging board includes a substrate 1, a coil array 2, a sensor array 3, an adjustable capacitor network (not shown in the figure), and a central control unit (not shown in the figure).

[0031] The substrate 1 serves as the carrier for various electronic components and coils, and is preferably made of multilayer PCB material. In some embodiments, the substrate 1 material can be the commonly used FR-4, or, in applications requiring higher temperature resistance and flexibility, a rigid-flex PCB or polyimide substrate can be used as an alternative.

[0032] Coil array 2 is disposed on substrate 1 and consists of multiple planar helical coils 21 arranged in a hexagonal pattern to form a honeycomb layout. Each planar helical coil 21 preferably has a diameter of 3 cm, and the center-to-center spacing between coils is approximately 4 cm. Under the same substrate 1 area and the same single-turn size, simulation or actual measurement shows that the effective coverage density of this honeycomb layout can be increased by approximately 30% compared to a rectangular array. Each coil is preferably independently packaged on an FR-4 substrate 1 unit, and a reverse compensation winding is wound around it to reduce magnetic field coupling interference between coils. Actual measurements show that after adopting the reverse compensation winding, the magnetic field interference between adjacent coils can be reduced to ≤5 μT, while the conventional solution is typically ≥12 μT.

[0033] The sensor array 3 includes multiple Hall sensors 31, each disposed at a corner of the substrate 1. The Hall sensors 31 preferably have a sensitivity of ±1 mT and calculate the center coordinates of the device being charged, placed on the surface of the charging plate, using a differential magnetic field detection method. In some embodiments, the measurement error of the center coordinates can be controlled within ±2 mm. The Hall sensors 31 are fixed to the device mounting area at the corner of the substrate 1 by welding or plugging, and cooperate with necessary signal conditioning and filtering circuits to ensure detection accuracy and anti-interference performance under different operating conditions. In some embodiments, a foreign object detection (FOD) sensor or redundant Hall sensor 31 units can also be added to provide backup input when the detection result is abnormal or external interference is strong.

[0034] Each adjustable capacitor network is electrically connected to each planar helical coil 21 in a one-to-one correspondence, providing an independent impedance adjustment unit for that coil. The adjustable capacitor network consists of several capacitor units and switching devices. The capacitor units can be connected to the corresponding coil circuit through parallel or series connections of the switches. With this structure, different coils can maintain independent resonance conditions during operation, avoiding the defect that a single matching circuit cannot adapt to multiple coils.

[0035] The central control unit is electrically connected to each adjustable capacitor network and the sensor array 3, and is connected to the capacitor network via digital control signals to selectively connect or disconnect each capacitor unit. Simultaneously, the central control unit receives signal input from the sensor array 3 and determines which capacitor networks remain conductive to keep the corresponding coil units operational. In some embodiments, the connection between the central control unit and the adjustable capacitor network can be achieved via pin headers or flexible ribbon cables, while the connection between the sensor array 3 and the central control unit uses a standard signal bus in conjunction with a filtering circuit.

[0036] In some embodiments, the multi-device adaptive wireless charging pad further includes a switching circuit module (not shown) corresponding to each coil array 2, with each switching circuit module electrically connected to its corresponding coil. The switching circuit module preferably includes a field-effect transistor (FET) and a gate driver. The main electrode of the FET is connected in series or parallel to the corresponding coil, and the gate driver is electrically connected to the central control unit. In some embodiments, when the sensor array 3 detects a device position shift, the central control unit can activate three adjacent coil units within approximately 50ms. The three coils are arranged in an equilateral triangle on the substrate 1, thereby forming a local energy focusing area on the surface of the charging pad.

[0037] In some embodiments, the charging board further includes a phase synchronization unit (not shown in the figure), which is electrically connected to the switching circuit module and is used to coordinate the driving phase of the coil array 2. The phase synchronization unit can be implemented using a PLL circuit, a phase shifter circuit, or other synchronization modules to ensure that the driving currents of multiple planar helical coils 21 maintain a consistent phase or meet a preset phase difference when they work simultaneously.

[0038] In some embodiments, the charging board further includes a thermal management component 4 disposed on the side of the substrate 1. The thermal management component 4 includes a graphene-paraffin composite phase change material layer, two thermally conductive adhesive layers, and several heat dissipation fins. The phase change material layer has a thickness of 0.5 mm and a phase change temperature of 42 °C; the thermal resistance of the thermally conductive adhesive layers is less than or equal to 0.8 °C·cm² / W. The heat dissipation fins are made of aluminum or aluminum alloy and are arranged in a uniform or stepped manner to increase the heat exchange area. Through the above-described combined structure, the operating temperature of the charging board can be effectively controlled under high-power multi-device charging conditions, avoiding local overheating.

[0039] As can be seen, the embodiments of this application, by arranging a honeycomb coil array 2 on the substrate 1 and combining it with the sensor array 3, adjustable capacitor network, switching circuit module and thermal management component 4, enable the charging board to achieve a high-density coverage area within a limited area, increase the effective charging surface, improve heat dissipation and anti-interference performance, and reduce the decrease in charging efficiency caused by device placement offset.

[0040] In summary, the multi-device adaptive wireless charging board provided in this application includes a substrate 1, a coil array 2, a sensor array 3, an adjustable capacitor network, and a central control unit. The coil array 2 is disposed on the substrate 1 and consists of multiple planar spiral coils 21 arranged in a hexagonal honeycomb pattern. The sensor array 3 includes multiple Hall sensors 31, each located at a corner of the substrate 1. Each adjustable capacitor network is electrically connected to each planar spiral coil 21 in a one-to-one correspondence. The central control unit is electrically connected to both the adjustable capacitor network and the sensor array 3. This solution, by densely arranging multiple planar spiral coils 21 in a hexagonal pattern on the substrate 1, can form a high-density coverage area within a limited area, increasing the effective charging surface and reducing the decrease in charging efficiency caused by device placement deviations.

[0041] The multi-device adaptive wireless charging pad provided in this application has been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A multi-device adaptive wireless charging pad, characterized in that, include: substrate; A coil array is disposed on the substrate, and the coil array is composed of multiple planar spiral coils, which are arranged in a hexagonal pattern to form a honeycomb layout. A sensor array, comprising a plurality of Hall sensors, each of which is disposed at a corner of the substrate; An adjustable capacitor network, wherein each of the adjustable capacitor networks is electrically connected to each of the planar helical coils in a one-to-one correspondence; The central control unit is electrically connected to the adjustable capacitor network and the sensor array, respectively.

2. The multi-device adaptive wireless charging pad as described in claim 1, characterized in that, It also includes a thermal management component disposed on the side of the substrate.

3. The multi-device adaptive wireless charging pad as described in claim 2, characterized in that, The thermal management component includes a graphene-paraffin composite phase change material layer, two thermally conductive adhesive layers, and several heat dissipation fins. The graphene-paraffin composite phase change material layer is bonded to the substrate through the thermally conductive adhesive layers, and the several heat dissipation fins are bonded to the graphene-paraffin composite phase change material layer through the thermally conductive adhesive layers.

4. The multi-device adaptive wireless charging pad as described in claim 1, characterized in that, It also includes a switching circuit module that is configured one-to-one with the coil array, and each switching circuit module is electrically connected to the corresponding planar spiral coil.

5. The multi-device adaptive wireless charging pad as described in claim 4, characterized in that, The switching circuit module includes a field-effect transistor and a gate driver that works with the field-effect transistor.

6. The multi-device adaptive wireless charging pad as described in claim 4, characterized in that, It also includes a phase synchronization unit, which is electrically connected to the switching circuit module to coordinate the driving phase of the coil array.

7. The multi-device adaptive wireless charging pad as described in claim 1, characterized in that, The adjustable capacitor network includes at least one set of capacitor units that can be connected in parallel or in series via switches. The capacitor units are selected to be connected or disconnected by the central control unit through digital control signals.

8. The multi-device adaptive wireless charging pad as described in claim 3, characterized in that, The thickness of the graphene-paraffin composite phase change material layer is 0.5 mm, and the phase change temperature is 42 °C.

9. The multi-device adaptive wireless charging pad as described in claim 1, characterized in that, Each of the planar helical coils has a diameter of 3 cm.

10. The multi-device adaptive wireless charging pad as described in claim 3, characterized in that, The thermal resistance of the thermally conductive adhesive layer is less than or equal to 0.8℃·cm. 2 / W.

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