Wireless charging equipment and wireless charging system

Abstract

The invention provides wireless charging equipment and a wireless charging system, which can prevent an NFC (Near Field Communication) circuit from being damaged. The surface of the wireless charging device serves as a charging plane for placing at least one electronic device, the at least one electronic device comprises one or more of a near field communication circuit or a wireless charging receiving circuit, the wireless charging device comprises a detection coil array, and the detection coil array comprises a plurality of detection areas. The plurality of detection areas respectively correspond to the plurality of charging areas of the charging plane, and the detection areas can have the capability of detecting the signal type of a signal sent by the electronic equipment, so that whether the electronic equipment on the charging plane comprises an NFC circuit or a wireless charging receiving circuit is detected. Therefore, the wireless charging equipment can adjust the wireless charging power of the electronic equipment according to the condition that the electronic equipment on the charging plane comprises the near field communication circuit or the wireless charging receiving circuit, and the NFC circuit can be prevented from being damaged.

Description

Wireless charging device and wireless charging system Technical Field

[0001] The present application relates to the field of wireless charging technology, and in particular to a wireless charging device and a wireless charging system. Background Art

[0002] Wireless charging technology (WCT) uses conductive media such as electric fields, magnetic fields, microwaves, or lasers to achieve wireless power transmission. Due to its advantages of being wire-free and plug-free, it is increasingly being used in electronic devices. Currently, a growing number of electronic devices, such as mobile phones and wearable devices, are using wireless charging devices for wireless charging. Wireless charging devices include a transmitting coil, and the electronic device includes a receiving coil.

[0003] Currently, wireless charging technology transfers energy through magnetic field coupling between a transmitting coil and a receiving coil. This requires the transmitting coil and the receiving coil to be within a certain distance. If a user places a device containing near-field communication (NFC) circuitry within this distance, the NFC circuitry in the wireless charging device will be damaged during wireless charging.

[0004] Summary of the Invention

[0005] The present application provides a wireless charging device and a wireless charging system, which can prevent damage to the NFC circuit.

[0006] In a first aspect, an embodiment of the present application provides a wireless charging device, wherein the surface of the wireless charging device serves as a charging plane for placing at least one electronic device, the at least one electronic device includes one or more of a near-field communication circuit or a wireless charging receiving circuit, the wireless charging device includes a detection coil array, the detection coil array includes multiple detection areas, the multiple detection areas respectively correspond to multiple charging areas of the charging plane, and the multiple detection areas are respectively used to detect the signal type of a signal emitted by the at least one electronic device placed on the charging plane, wherein: the wireless charging device is used to adjust the power of wireless charging to the at least one electronic device in response to the signal type detected by at least one of the detection areas.

[0007] In embodiments of the present application, the detection area may be capable of detecting the type of signal emitted by an electronic device, thereby detecting whether the electronic device on the charging surface includes an NFC circuit or a wireless charging receiving circuit. This allows the wireless charging device to adjust the power of the wireless charging device based on whether the electronic device on the charging surface includes a near-field communication circuit or a wireless charging receiving circuit, thereby preventing damage to the NFC circuit.

[0008] In one possible design, the wireless charging device can adjust the power of wireless charging to the at least one electronic device to be less than or equal to a preset limit value in response to the signal type detected by at least one detection area including a wireless charging type signal and a near-field communication type signal.

[0009] In an embodiment of the present application, the signal types detected by at least one of the detection areas include wireless charging signals and near-field communication signals, indicating that the electronic device placed on the charging surface includes a wireless charging receiving circuit and an NFC circuit. The wireless charging device uses a power less than or equal to a preset limit to wirelessly charge the wireless charging receiving circuit, i.e., low-power wireless charging, which can prevent damage to the NFC circuit.

[0010] In one possible design, the wireless charging device may adjust the power of wireless charging to the at least one electronic device to be greater than the preset limit value in response to the signal type detected in at least one detection area including a wireless charging type signal and not including a near-field communication type signal.

[0011] In an embodiment of the present application, the signal type detected by at least one of the detection areas includes a wireless charging type signal and does not include a near field communication type signal, which can reflect that the electronic device placed on the charging plane includes a wireless charging receiving circuit but does not include an NFC circuit. The wireless charging device can wirelessly charge the wireless charging receiving circuit on the charging plane according to conventional power. Optionally, the wireless charging device can exchange charging parameters with the wireless charging receiving circuit based on wireless charging technology, and use the charging parameters provided by the wireless charging receiving circuit to wirelessly charge the wireless charging receiving circuit. Typically, the wireless charging device uses the charging parameters provided by the wireless charging receiving circuit, and the power of wireless charging the wireless charging receiving circuit is greater than the preset limit value.

[0012] In one possible design, the detection coil array is used to detect at least one of a near-field communication type signal and a wireless charging type signal, wherein: the near-field communication type signal includes one or more of a resonant signal generated by a receiving coil in a near-field communication circuit and a communication signal generated by the near-field communication circuit; and the wireless charging type signal includes one or more of a resonant signal generated by a receiving coil in a wireless charging receiving circuit and a communication signal generated by the wireless charging receiving circuit.

[0013] In an embodiment of the present application, an NFC type signal may include any one of an NFC communication signal and an NFC resonance signal. The NFC communication signal is a communication signal sent by an NFC circuit based on an NFC communication protocol, that is, a communication signal generated by the NFC circuit. The NFC resonance signal may be a resonance signal generated by a receiving coil in an NFC circuit, that is, a resonance signal generated by an NFC circuit. A wireless charging type signal may include any one of a wireless charging communication signal and a wireless charging resonance signal. The wireless charging communication signal may be a communication signal sent by a wireless charging receiving circuit based on a wireless charging protocol, that is, a communication signal generated by a wireless charging receiving circuit. The wireless charging resonance signal may be a resonance signal generated by a receiving coil in a wireless charging receiving circuit, that is, a resonance signal generated by a wireless charging receiving circuit.

[0014] In one possible design, the wireless charging device includes a transmitting coil and an alignment mechanism, the alignment mechanism is used to move the transmitting coil, the multiple detection areas are respectively used to detect the signal strength of the wireless charging type signal emitted by the at least one electronic device, and the alignment mechanism can be used to move the transmitting coil to a target area, the target area includes a partial area of ​​the multiple detection areas, and the partial area is determined based on the signal strength of the wireless charging type signal detected by at least one of the detection areas.

[0015] In an embodiment of the present application, the signal strength of the wireless charging type signal can represent the strength of the wireless charging type signal. Optionally, the power or voltage of the wireless charging type signal detected in the detection area can be regarded as the signal strength of the wireless charging type signal. The wireless charging device may include a transmitting coil and an alignment mechanism. The alignment mechanism can move the transmitting coil. The transmitting coil can be used for wireless charging with a wireless charging receiving circuit. The wireless charging device can determine or select the charging area corresponding to some of the detection areas from the multiple detection areas as the target area, and the alignment mechanism can move the transmitting coil to the target area to facilitate the alignment of the transmitting coil with the wireless charging receiving circuit placed in the target area, thereby improving the charging efficiency of the wireless charging receiving circuit.

[0016] In one possible design, the multiple detection areas are respectively used to detect the signal strength of the near-field communication type signal emitted by the at least one electronic device. The wireless charging device can control the wireless charging power of the transmitting coil in the limited area to be less than or equal to the preset limit value based on the signal strength of the near-field communication type signal detected by at least one of the detection areas. The limited area includes the charging area corresponding to the partial detection area determined from the multiple detection areas, and the determined partial detection area is determined from the multiple detection areas based on the signal strength of the near-field communication type signal detected by at least one of the detection areas.

[0017] In an embodiment of the present application, the wireless charging device can determine a limited area corresponding to NFC. For example, based on the signal strength of the near-field communication type signal detected in the detection area, a part of the detection area is determined or selected, and the charging area corresponding to the determined or selected detection area is used as the limited area. The limited area can represent the area that affects the NFC circuit. It indicates that if normal power wireless charging is performed in the limited area, the NFC circuit in the area will be damaged. The wireless charging device can control the wireless charging power in the limited area to be less than a preset limit value, which can avoid damage to the NFC circuit in the limited area.

[0018] In one possible design, the detection coil array can include multiple first detection coils arranged on a printed circuit board, the multiple first detection coils being arranged along a first direction, with two adjacent first detection coils partially overlapping; and multiple second detection coils arranged on the printed circuit board, the multiple second detection coils being arranged along a second direction, with two adjacent second detection coils partially overlapping, and the second direction being non-parallel to the first direction. The printed circuit board is parallel to the charging plane, the projections of the multiple first detection coils on the charging plane at least partially overlap with the projections of the multiple second detection coils on the charging plane, and the overlapping portion of the projection of one first detection coil on the charging plane and the projection of one second detection coil on the charging plane forms a detection area.

[0019] In this embodiment of the present application, the detection coil array may include multiple first detection coils and multiple second detection coils. The overlapping portion of the projections of a first detection coil and a second detection coil on the charging plane may form a detection area. The signal type of the signal detected by the first detection coil and the signal type of the signal detected by the second detection coil may be used to determine the signal type of the detection area.

[0020] In one possible design, the detection area can be used to determine the detected signal type based on the wireless charging type signal or the near field communication type signal detected by at least one of the first detection coil or the second detection coil.

[0021] In one possible design, the detection coil array can be used to determine whether a wireless charging receiving circuit is placed in the charging area corresponding to a detection area based on the signal strength of the wireless charging type signals detected by the multiple first detection coils and the signal strength of the wireless charging type signals detected by the multiple second detection coils.

[0022] In one possible design, the target area includes one or more charging areas corresponding to the detection areas determined based on one or more adjacent first detection coils and one or more adjacent second detection coils, wherein: the one or more adjacent first detection coils are determined based on the comparison result of the signal strength of the wireless charging type signal detected by the multiple first detection coils and the first threshold, and the one or more adjacent second detection coils are determined based on the comparison result of the signal strength of the wireless charging type signal detected by the multiple second detection coils and the first threshold.

[0023] In an embodiment of the present application, the wireless charging device can select one or more adjacent first detection coils based on a comparison result of the signal strength of the wireless charging type signals detected by the multiple first detection coils with a first threshold. One or more adjacent second detection coils can be selected based on a comparison result of the signal strength of the wireless charging type signals detected by the multiple second detection coils with a first threshold. One or more detection areas are selected based on the selected one or more adjacent first detection coils and the selected one or more adjacent second detection coils, and the charging area corresponding to the selected one or more detection areas is used as the target area. Based on the signal strength of the wireless charging type signals detected by the first detection coil and the second detection coil, the wireless charging device can select the detection area formed by the selected first detection coil and the selected second detection coil as the selected one or more detection areas. Using the charging area corresponding to the selected detection area as the target area can realize the function of determining the position of the wireless charging receiving circuit. This facilitates the alignment of the transmitting coil and the wireless charging receiving circuit, thereby improving the efficiency of wireless charging.

[0024] In one possible design, the detection coil array can determine that a near-field communication circuit is placed in the charging area corresponding to one or more detection areas based on the signal strength of the near-field communication type signals detected by the multiple first detection coils and the signal strength of the near-field communication type signals detected by the multiple second detection coils.

[0025] In one possible design, the limited area includes one or more charging areas corresponding to the detection areas determined based on one or more adjacent first detection coils and one or more adjacent second detection coils, wherein: the one or more adjacent first detection coils are determined based on the comparison result of the signal strength of the near-field communication type signal detected by the multiple first detection coils and the second threshold, and the one or more adjacent second detection coils are determined based on the comparison result of the signal strength of the near-field communication type signal detected by the multiple second detection coils and the second threshold.

[0026] In an embodiment of the present application, the wireless charging device can select one or more adjacent first detection coils based on a comparison result of the signal strength of the near-field communication type signals detected by the multiple first detection coils with a second threshold. One or more adjacent second detection coils can be selected based on a comparison result of the signal strength of the near-field communication type signals detected by the multiple second detection coils with a second threshold. One or more detection areas are selected based on the selected one or more adjacent first detection coils and the selected one or more adjacent second detection coils, and the charging area corresponding to the selected one or more detection areas serves as the defined area. The wireless charging device can select the detection area formed by the first detection coil and the selected second detection coil based on the signal strength of the near-field communication type signals detected by the first detection coil and the second detection coil as the selected one or more detection areas. Using the charging area corresponding to the selected detection area as the defined area can achieve the function of determining the location of the NFC circuit. This facilitates adjusting the wireless charging power within the defined area to be less than a preset limit value to avoid damage to the NFC circuit.

[0027] In one possible design, the wireless charging device can decode the signals respectively received by the first detection coil and the second detection coil in the detection coil array. The decoding results include the NFC start communication code, and the type of signal received by the detection coil array can be determined to be an NFC type signal. Alternatively, the wireless charging device can determine that the type of signal received by the detection coil array is an NFC type signal based on the fact that the signals received by the first detection coil and the second detection coil in the detection coil array comply with the frame format specified in the NFC communication protocol. Alternatively, the wireless charging device can detect the frequencies contained in the signals respectively received by the first detection coil and the second detection coil in the detection coil array. If it is detected that the received signals contain a signal of the first frequency, it can be determined that the type of signal received by the detection coil array is an NFC type signal. The first frequency is the resonant frequency of the receiving coil in the NFC circuit.

[0028] In one possible design, the wireless charging device can determine that the signal received by the detection coil array is a wireless charging type signal based on the value of the header portion specified in the wireless charging protocol when the signals received by the first detection coil and the second detection coil in the detection coil array are received. Alternatively, the wireless charging device can detect the frequency contained in the signals received by the first detection coil and the second detection coil in the detection coil array. If the received signals contain a signal of a second frequency, the device can determine that the signal received by the detection coil array is a wireless charging type signal. The second frequency is the resonant frequency of the receiving coil in the wireless charging receiving circuit.

[0029] In a second aspect, embodiments of the present application further provide a wireless charging system that may include multiple wireless charging devices. Any wireless charging device may be any of the wireless charging devices provided in the first aspect. The surface of the wireless charging system serves as a charging plane for placing at least one electronic device, and the charging plane of the wireless charging system is formed by combining the charging planes of the multiple wireless charging devices.

[0030] The charging plane of each wireless charging device is disposed on a surface of the wireless charging system; the wireless charging system includes a plurality of transmitting coils and an alignment module; the plurality of transmitting coils correspond one-to-one with the plurality of wireless charging devices. In response to at least one wireless charging device detecting a wireless charging receiving circuit, the alignment module moves a first transmitting coil to align with the wireless charging receiving circuit, wherein, among the plurality of first transmitting coils that are not in operation, the distance between each transmitting coil and the position of the wireless charging receiving circuit is the smallest.

[0031] In an embodiment of the present application, the alignment module may include an alignment mechanism in each wireless charging device. The multiple transmitting coils included in the wireless charging system may be the transmitting coils in multiple wireless charging devices. To improve the charging flexibility of the wireless charging system, the alignment module may uniformly dispatch the transmitting coils to wirelessly charge the wireless charging receiving circuit placed on the surface of the system. The wireless charging system may respond to a wireless charging device detecting a wireless charging receiving circuit and move the first transmitting coil closest to the position of the wireless charging device to align with the wireless charging receiving circuit, thereby shortening the alignment time.

[0032] In one possible design, the alignment module may move the first transmitting coil and the target second transmitting coil in the same direction in response to at least one second transmitting coil being located on a path between the center position of the first transmitting coil and the position of the wireless charging receiving circuit. The movement speed of the first transmitting coil in the same direction is less than the movement speed of the target second transmitting coil in the same direction. The target second transmitting coil is the second transmitting coil that is closest to the first transmitting coil among the at least one second transmitting coil.

[0033] In an embodiment of the present application, if there are other transmitting coils on the moving path of the first transmitting coil, the alignment module can move the other transmitting coils on the path. For the target second transmitting coil on the path that is closest to the first transmitting coil, the alignment mechanism can simultaneously move the target second transmitting coil and the first transmitting coil in the same direction and at different speeds, where the speed of the target second transmitting coil is greater than that of the first transmitting coil. This allows the alignment module to simultaneously move the first transmitting coil and the target second transmitting coil and align the first transmitting coil with the wireless charging receiving circuit, reducing the alignment time. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] FIG1A shows a schematic diagram of a wireless charging system;

[0035] FIG1B shows a schematic structural diagram of a wireless charging system;

[0036] FIG2 shows a schematic structural diagram of a wireless charging device;

[0037] FIG3A is a schematic diagram showing a position between two detection areas;

[0038] FIG3B is a schematic diagram showing a position between two detection areas;

[0039] FIG3C is a schematic diagram showing a position between two detection areas;

[0040] FIG3D is a schematic diagram showing a position between two detection areas;

[0041] FIG4 is a schematic diagram showing the positions between a plurality of detection areas;

[0042] FIG5A shows a schematic structural diagram of a wireless charging device;

[0043] FIG5B shows a schematic diagram of a specific structure of a wireless charging device;

[0044] FIG5C shows a schematic diagram of a specific structure of a wireless charging device;

[0045] FIG5D is a schematic diagram showing a coordinate system of multiple detection areas of a wireless charging device;

[0046] FIG5E is a schematic diagram showing a defined area;

[0047] FIG5F shows a schematic diagram of a defined area;

[0048] FIG6A shows a schematic structural diagram of a wireless charging device;

[0049] FIG6B shows a schematic diagram of a specific structure of a wireless charging device;

[0050] FIG6C shows a schematic diagram of a specific structure of a wireless charging device;

[0051] FIG7A is a schematic diagram showing the positional relationship of multiple charging planes in a wireless charging system;

[0052] FIG7B is a schematic diagram showing the positional relationship of multiple charging planes in a wireless charging system;

[0053] FIG7C is a schematic diagram showing the positional relationship of multiple charging planes in a wireless charging system;

[0054] FIG7D is a schematic diagram showing the positional relationship of multiple charging planes in a wireless charging system;

[0055] FIG7E is a schematic diagram showing the positional relationship of multiple charging planes in a wireless charging system;

[0056] FIG8A is a schematic diagram showing the positional relationship of multiple charging planes in a wireless charging system;

[0057] FIG8B is a schematic diagram showing the positional relationship between an electronic device and multiple charging planes in a wireless charging system;

[0058] FIG8C is a schematic diagram showing a range of movement of a transmitting coil;

[0059] FIG9A shows an exploded view of the structure of a wireless charging system;

[0060] FIG9B shows a schematic structural diagram of a wireless charging system;

[0061] FIG10 shows a functional schematic diagram of a wireless charging system;

[0062] FIG11 shows a flow chart of the working process of a wireless charging system. DETAILED DESCRIPTION

[0063] The terms "first," "second," and the like in the following description are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Thus, a feature defined as "first," "second," and the like may explicitly or implicitly include one or more of such features. In the description of the embodiments of this application, unless otherwise specified, "a plurality" means two or more.

[0064] In addition, in the embodiments of the present application, directional terms such as "upper" and "lower" may be defined including but not limited to the orientation relative to the schematic placement of the components in the drawings. It should be understood that these directional terms may be relative concepts, which are used for relative descriptions and clarifications, and may change accordingly according to changes in the orientation of the components in the drawings.

[0065] In the embodiments of this application, unless otherwise specified or limited, the term "connection" should be understood broadly. For example, "connection" can mean a fixed connection, a detachable connection, or an integral connection; it can mean a direct connection or an indirect connection through an intermediate medium. In addition, the term "coupling" can refer to the method of electrical connection for signal transmission. "Coupling" can mean a direct electrical connection or an indirect electrical connection through an intermediate medium.

[0066] In the embodiments of this application, a circuit that supports the NFC protocol or technology is referred to as an NFC circuit. Typically, an NFC circuit is provided with a receiving coil for NFC communication. A device that includes an NFC circuit is referred to as an NFC device. The embodiments of this application do not specifically limit the form factor of an NFC device. Currently, a more common form factor is a card, such as an ID card or bank card.

[0067] In the embodiment of the present application, the circuit including the support for wireless charging protocol or technology is referred to as a wireless charging receiving circuit. The device including the wireless charging receiving circuit is referred to as a wireless charging receiving device. Usually, the wireless charging receiving circuit is provided with a receiving coupon for wireless charging. The wireless charging receiving circuit generally refers to a circuit that can charge the battery in the device to which it belongs or supply power to the load in the device through wireless charging. The embodiment of the present application does not specifically limit the type of wireless charging receiving device. For example, the wireless charging receiving device can be a mobile phone, a tablet computer (pad), a computer with wireless transceiver function, a smart wearable product (for example, a smart watch, a smart bracelet, a headset, etc.), a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, etc. having a wireless device.

[0068] An embodiment of the present application relates to a wireless charging system for wirelessly charging a wireless charging receiving device. The wireless charging system can be connected to a power source. For example, the wireless charging system has a Type C interface, one end of an adapter is connected via the Type C interface, and the other end of the adapter is connected to a mains power source, such as AC 220V. The wireless charging system includes a transmitting coil, and the electronic device includes a receiving coil. The power source supplies power to the transmitting coil in the wireless charging system. When the electronic device is close to the wireless charging system, the electromagnetic field of the transmitting coil is coupled to the receiving coil, so that the energy coupled by the receiving coil can be converted to charge the battery in the electronic device.

[0069] Refer to Figure 1A, which is a schematic diagram of a wireless charging system provided in an embodiment of the present application. Figure 1A only shows the wireless charging system 1000 as a planar type, that is, the wireless charging system can be placed flat on the table when working. In addition, the wireless charging system 1000 provided in the embodiment of the present application can also be a three-dimensional type. For example, it can be placed on the table in other postures through a bracket. Figure 1A takes the appearance of the wireless charging system as an oval as an example. The embodiment of the present application does not limit the appearance of the wireless charging system. It can be circular, rectangular, etc. In addition, the wireless charging system can also be a three-dimensional shape.

[0070] With the widespread use of wireless charging systems in our daily lives, users often place both an NFC device and an electronic device with a receiving coil on a flat surface. When the transmitting coil in the wireless charging system wirelessly charges the receiving coil of the electronic device, the electromagnetic waves transmitted between the transmitting and receiving coils can damage the NFC circuitry in the NFC device, causing it to malfunction.

[0071] In view of this, the present application provides a wireless charging system and a wireless charging device with the function of protecting NFC devices to avoid damaging NFC circuits. The wireless charging system may include at least one wireless charging device, and the wireless charging device may have the function or ability to avoid damaging NFC circuits.

[0072] The wireless charging system provided in the embodiment of the present application can be used to wirelessly charge one or more wireless charging receiving devices. As shown in Figure 1B, the wireless charging system may include multiple wireless charging devices 1000A. The surface of the wireless charging system 1000A can be used as a charging plane for placing at least one electronic device. The at least one electronic device placed on the charging plane may include one or more of an NFC circuit or a wireless charging receiving circuit. In the wireless charging system, the surfaces of each wireless charging device 1000A are on the same plane. In the wireless charging system, the charging planes of multiple wireless charging devices 1000A can be continuous, or there can be a gap between any two charging planes, or any two charging planes can overlap. The present application does not specifically limit the contour shape of the charging plane of each wireless charging device 1000A. The contour of the charging plane of the wireless charging device 1000A can be a regular pattern or an irregular pattern.

[0073] The following describes the wireless charging device provided in an embodiment of the present application, with reference to the accompanying drawings. Figure 2 shows a schematic structural diagram of a wireless charging device provided in an embodiment of the present application. The wireless charging device 1000A may include a detection coil array 10, a control module 20, and a transmitting coil 30. The detection coil array 10 may be used to detect the type of signal emitted by at least one electronic device placed on the charging plane. The transmitting coil 30 may be used for wireless charging. Optionally, to enhance the freedom of wireless charging, the wireless charging device may also include an alignment mechanism 40 coupled to the transmitting coil 30 in the wireless charging device. The alignment mechanism 40 may be used to move the transmitting coil 30. In some scenarios, the alignment mechanism 40 includes at least one motor, typically two motors for each transmitting coil, which may respectively drive the transmitting coil to move in a first direction and a second direction, wherein the first and second directions are non-parallel. This embodiment of the present application does not impose any further limitations on this. Optionally, the alignment mechanism 40 may include a guide rail. The control module 20 may be connected to the detection coil array 10, the transmitting coil 30, and the alignment mechanism 40. The control module 20 can control the detection coil array 10, enabling the detection coil array 10 to detect the signal type of the signal emitted by the electronic device. The control module 20 can also control the transmitting coil 30, enabling the transmitting coil 30 to perform wireless charging and adjusting the power of the transmitting coil 30 for wireless charging. Optionally, the control module 20 can control the alignment mechanism 40, enabling the alignment mechanism 40 to move the transmitting coil 30.

[0074] The detection coil array 10 may include multiple detection areas. The multiple detection areas may respectively correspond to multiple charging areas of the charging plane. In an embodiment of the present application, one detection area may correspond to one charging area, and one charging area may correspond to one detection area. The projection of a detection area on the charging plane may include the projection of the charging area corresponding to the detection area on the charging plane, or the projection of a detection area on the charging plane overlaps with the projection of the charging area corresponding to the detection area on the charging plane. Among the multiple detection areas, the positional relationship between two adjacent detection areas may be any one of the following examples:

[0075] Example 1, see Figure 3A. On the charging plane, there is a gap between two adjacent detection areas. In this case, there is a gap between each charging area. Example 2, see Figure 3B. On the charging plane, two adjacent detection areas are continuous, and there may be no gap between the two detection areas. Example 3, see Figure 3C. On the charging plane, two adjacent detection areas may partially overlap. The charging areas corresponding to the two adjacent detection areas may not overlap. Example 4, see Figure 3D. On the charging plane, two adjacent detection areas may partially overlap, and the charging areas corresponding to the two adjacent detection areas may overlap. The black shaded area shown in Figure 3D is the overlapping charging area.

[0076] In one possible scenario, multiple detection areas may be arranged in a matrix. Among the multiple detection areas, a detection area may have adjacent detection areas in a first direction and adjacent detection areas in a second direction. The first direction and the second direction are not parallel. Optionally, the first direction may be perpendicular to the second direction. For ease of explanation, the first direction and the second direction are perpendicular as an example, where the first direction is recorded as the row direction and the second direction is recorded as the column direction. The positional relationship between two adjacent detection areas in the row direction may be any one of the above examples 1-3. The positional relationship between two adjacent detection areas in the column direction may be any one of the above examples 1-3.

[0077] The detection coil array 10 includes multiple detection areas for detecting the signal type of the signal emitted by at least one electronic device placed on the charging plane. The signal type may include, but is not limited to, a signal emitted by an NFC circuit and a signal emitted by a wireless charging receiving circuit. For ease of introduction, in this application, the signal emitted by the NFC circuit is referred to as an NFC type signal, and the signal emitted by the wireless charging receiving circuit is referred to as a wireless charging type signal. The NFC type signal may include any one of an NFC communication signal and an NFC resonance signal. The NFC communication signal is a communication signal emitted by the NFC circuit based on the NFC communication protocol, that is, a communication signal generated by the NFC circuit. The NFC resonance signal may be a resonance signal generated by the receiving coil in the NFC circuit, that is, a resonance signal generated by the NFC circuit. The wireless charging type signal may include any one of a wireless charging communication signal and a wireless charging resonance signal. The wireless charging communication signal may be a communication signal emitted by the wireless charging receiving circuit based on the wireless charging protocol, that is, a communication signal generated by the wireless charging receiving circuit. The wireless charging resonance signal may be a resonance signal generated by the receiving coil in the wireless charging receiving circuit, that is, a resonance signal generated by the wireless charging receiving circuit.

[0078] First, the implementation method of the detection coil array 10 detecting the signal type of the signal emitted by the electronic device placed on the charging surface is described. It is understood that the detection coil array 10 can use detection methods including but not limited to those provided in the embodiments of the present application to detect the signal type of the signal emitted by the electronic device.

[0079] In a possible detection manner, the detection coil array 10 receives a signal sent by an electronic device placed on a charging plane, and the control module 20 can determine the type of the signal received by the detection coil array 10 .

[0080] The control module 20 can determine whether the signal received by the detection coil array 10 complies with the NFC communication protocol. In one possible design, the control module 20 can determine that the signal received by the detection coil array 10 is an NFC signal based on the decoding result of the signal received by the detection coil array 10 including the NFC start of communication code. The control module 20 can determine that the signal received by the detection coil array 10 is an NFC signal based on the fact that the signal received by the detection coil array 10 complies with the frame format specified in the NFC communication protocol.

[0081] Typically, wireless charging between a wireless charging device and a wireless charging receiving device includes a ping phase, a configuration phase, a negotiation phase, and a power transfer phase. In the ping phase, the configuration phase, and the negotiation phase, the wireless charging receiving device may send a signal carrying wireless charging parameters, and the signal carrying wireless charging parameters generally includes a header portion and a parameter portion. The value of the header portion may reflect the specific type of parameter carried by the signal, and the parameter portion contains parameters. The value of the header portion may be the value of the header portion specified in any wireless charging protocol. The control module 20 may determine that the type of signal received by the detection coil array 10 is a wireless charging type signal based on the fact that the signal received by the detection coil array 10 includes the value of the header portion specified in the wireless charging protocol.

[0082] In another possible detection method, the control module 20 can use information such as the frequency, strength, or power of the signal received by the detection coil array 10 to determine the signal type. The following describes in detail the method of using the frequency of the signal received by the detection coil array 10 to determine the signal type received by the detection coil array 10.

[0083] The control module 20 can control the detection coil array 10 to send a pulse signal, causing the coils of the electronic devices placed on the charging plane to self-resonate and emit a resonant signal. The detection coil array 10 can receive the resonant signal generated by one or more electronic devices placed on the charging plane.

[0084] The pulse signal sent by the detection coil array 10 can be received by the electronic device placed on the charging plane. If the electronic device on the charging plane includes an NFC circuit, after the NFC circuit receives the pulse signal, it self-resonates under the action of the pulse signal and generates a resonant signal with a first frequency. The detection coil array 10 can be coupled to the resonant signal of the first frequency generated by the NFC circuit. The first frequency represents the resonant frequency of the receiving coil of the NFC circuit. Typically, the self-resonant frequency range of the NFC circuit includes frequencies around 13.56 MHz. For example, the self-resonant frequency range of the NFC circuit can be 13.56 MHz-7 kHz to 13.56 MHz+7 kHz. Optionally, the first frequency can be 13.56 MHz.

[0085] If the electronic device on the charging plane includes a receiving coil in a wireless charging receiving device, after receiving the pulse signal, the receiving coil in the wireless charging receiving device self-resonates under the action of the pulse signal and generates a resonant signal with a second frequency. The detection coil array 10 can be coupled to the resonant signal of the second frequency generated by the wireless charging receiving circuit. The second frequency represents the resonant frequency of the receiving coil in the wireless charging receiving circuit. Typically, the self-resonant frequency range of the receiving coil in the wireless charging receiving device is 300kHz to 1.5MHz. Optionally, the second frequency can be any frequency between 300kHz and 1.5MHz.

[0086] For ease of description, the resonant signal coupled to or received by the detection coil array 10 is referred to as the first resonant signal. The control module 20 is coupled to the detection coil array 10. The control module 20 may be capable of determining whether the first resonant signal includes a signal of the first frequency and whether it includes a signal of the second frequency. When the first resonant signal includes a signal of the first frequency, the signal type of the first resonant signal may be characterized as including an NFC signal. When the first resonant signal includes a signal of the second frequency, the signal type of the first resonant signal may be characterized as including a wireless charging signal.

[0087] In the embodiment of the present application, the signal type detected by the detection coil array 10 includes an NFC type signal, which can indicate that an NFC circuit is placed on the charging surface. The signal type detected by the detection coil array 10 includes a wireless charging type signal, which can indicate that a wireless charging receiving circuit is placed on the charging surface.

[0088] The wireless charging device 1000A may adjust the power of wireless charging of at least one electronic device placed on the charging plane in response to the type of signal detected by at least one detection area.

[0089] In one embodiment, the signal type emitted by at least one electronic device placed on the charging plane may include an NFC type signal and not a wireless charging type signal. In response to the signal type detected by at least one detection area only including an NFC type signal, the wireless charging device may control the transmitting coil in the charging area corresponding to the at least one detection area to not perform wireless charging. In this embodiment of the present application, the charging area corresponding to a detection area may be all or part of the range covered by the projection of the detection area on the charging plane.

[0090] Exemplarily, based on the wireless charging device provided in any of the above examples, the control module 20 may not control the transmitting coil to wirelessly charge the electronic device in the charging area corresponding to the at least one detection area when there is an NFC circuit in the charging area corresponding to the at least one detection area and there is no wireless charging receiving circuit.

[0091] In some possible scenarios, the control module 20 may not control the transmitting coil 30 to wirelessly charge the electronic device in the charging area corresponding to the at least one detection area, or not control the transmitting coil 30 to wirelessly charge the electronic device on the charging plane, in response to the first resonant signal detected by the at least one detection area containing a signal of the first frequency but not containing a signal of the second frequency.

[0092] In one embodiment, the signal type emitted by at least one electronic device placed on the charging plane may include a wireless charging type signal and not include an NFC type signal, that is, there is a wireless charging receiving circuit on the charging plane, but no NFC circuit. The wireless charging device 1000A may adjust the power of wireless charging of the at least one electronic device on the charging plane to be greater than a preset limit value in response to the signal type of the signal detected by at least one detection area only including a wireless charging type signal. Exemplarily, the wireless charging device 1000A may exchange charging parameters with the wireless charging receiving circuit based on wireless charging technology, and use the charging parameters provided by the wireless charging receiving circuit to wirelessly charge the wireless charging receiving circuit. Typically, the wireless charging device 1000A uses the charging parameters provided by the wireless charging receiving circuit to wirelessly charge the wireless charging receiving circuit at a power greater than the preset limit value.

[0093] In one possible design, multiple detection areas within the detection coil array 10 can be used to detect the signal strength of a wireless charging signal emitted by an electronic device on a charging surface. In embodiments of the present application, the signal strength of the wireless charging signal can represent the strength of the wireless charging signal. Optionally, the power or voltage of the wireless charging signal detected by the detection area can be considered the signal strength of the wireless charging signal.

[0094] The control module 20 in the wireless charging device 1000A can select charging areas corresponding to some of the detection areas from the multiple detection areas as target areas based on the signal strength of the wireless charging type signal detected by at least one detection area. The control module 20 in the wireless charging device 1000A can drive the alignment mechanism 40 to move the transmitting coil 30 to the target area. The control module 20 can control the transmitting coil 30 to wirelessly charge the wireless charging receiving circuit in the target area. It can be seen that the alignment mechanism 40 can move the transmitting coil 30 to the target area, and the target area includes some areas of the multiple detection areas of the detection coil array 10. The partial area can be determined based on the signal strength of the wireless charging type signal detected by at least one of the detection areas.

[0095] Optionally, the control module 20 may, based on the signal strength of the wireless charging signal detected in each detection area, select, from the multiple detection areas, the charging areas corresponding to all detection areas where the signal strength of the wireless charging signal detected is greater than a first threshold as target areas. As shown in FIG4 , assuming that the multiple detection areas are detection area W1, detection area W2, detection area W3, and detection area W4, and the signal strength of the wireless charging signal detected in detection area W2 and detection area W3 is greater than the first threshold, the control module 20 may select the charging areas corresponding to detection area W2 and detection area W3 as target areas.

[0096] Alternatively, the control module 20 may select, from among the multiple detection areas, the charging area corresponding to the detection area with the highest wireless charging signal strength as the target area based on the signal strength of the wireless charging signal detected in each detection area. As shown in FIG4 , assuming the multiple detection areas are detection area W1, detection area W2, detection area W3, and detection area W4, and detection area W2 has the highest wireless charging signal strength, the control module 20 may select the charging area corresponding to detection area W2 as the target area.

[0097] Alternatively, the control module 20 can determine the location of the wireless charging receiving circuit within the multiple detection areas based on the signal strength of the wireless charging signal detected by each detection area, and use the charging area corresponding to the detection area to which the location belongs as the target area. As shown in Figure 4, assuming that the multiple detection areas are detection area W1, detection area W2, detection area W3, and detection area W4, wherein the signal strength of the wireless charging type signal detected by detection area W2 and detection area W3 is greater than a first threshold, the control module 20 can calculate the location of the wireless charging receiving device based on the center position of detection area W2 and detection area W3, and the signal strength of the wireless charging type signal detected by detection area W2 and detection area W3, and calculate the charging area corresponding to the detection area to which the wireless charging receiving device is located, and can determine it as the target area.

[0098] In one embodiment, the signal type emitted by at least one electronic device placed on the charging plane may include both a wireless charging signal and an NFC signal, meaning that both a wireless charging receiving circuit and an NFC circuit are present on the charging plane. In response to the signal type detected by at least one detection area including both a wireless charging signal and an NFC signal, the wireless charging device 1000A may adjust the power used to wirelessly charge the at least one electronic device on the charging plane. The wireless charging device 1000A may be configured with multiple power adjustment strategies. The wireless charging device 1000A may implement any of the multiple power adjustment strategies.

[0099] Exemplarily, the wireless charging device 1000A may adjust the power of wireless charging to the at least one electronic device on the charging plane to be less than or equal to a preset limit value in response to the signal type of the signal detected by at least one detection area including a wireless charging type signal and an NFC type signal. Optionally, the preset limit value may be 0, i.e., the wireless charging device 1000A does not perform wireless charging. Alternatively, the preset limit value is a preset value, and the preset value is not 0. The wireless charging device 1000A performs low-power charging. Optionally, the preset limit value may be 5.

[0100] Exemplarily, the wireless charging device 1000A determines or selects a target area and a limited area in response to the signal type of the signal detected by at least one detection area including a wireless charging type signal and an NFC type signal. The target area may represent one or more detection areas where the wireless charging receiving circuit is located. The limited area may represent one or more detection areas where the NFC circuit is located. The limited area includes a charging area corresponding to a portion of the detection areas determined from the multiple detection areas of the detection coil array 10. The determined portion of the detection area may be determined from the multiple detection areas based on the signal strength of the near-field communication type signal detected by at least one of the detection areas.

[0101] If the target area overlaps or overlaps with the restricted area, the wireless charging device 1000A can control the wireless charging power of the transmitting coil 30 in the target area or the restricted area to be less than or equal to the preset limit. The overlap or overlap of the target area and the restricted area can reflect that the position of the wireless charging receiving circuit and the position of the NFC receiving circuit within the charging plane are relatively close. The wireless charging device 1000A can control the wireless charging power of the transmitting coil 30 to be less than or equal to the preset limit, thereby achieving low-power wireless charging of the wireless charging receiving circuit and avoiding damage to the NFC circuit.

[0102] If the target area does not overlap with the limited area, the wireless charging device 1000A can control the power of the transmitting coil in the target area for wireless charging to be greater than the preset limit value. The target area does not overlap with the limited area, which can reflect that the position of the wireless charging receiving circuit in the charging plane is far away from the position of the NFC receiving circuit. The wireless charging device 1000A can control the power of the transmitting coil 30 for wireless charging of the wireless charging receiving circuit to be greater than the preset limit value, thereby realizing wireless charging of the wireless charging receiving circuit. Optionally, the wireless charging device 1000A can exchange charging parameters with the wireless charging receiving circuit based on wireless charging technology. Typically, the wireless charging device 1000A uses the charging parameters provided by the wireless charging receiving circuit, and the power of wireless charging of the wireless charging receiving circuit is greater than the power threshold.

[0103] The following describes the process of determining or selecting a target area for the wireless charging device 1000A. In the detection coil array 10, multiple detection areas can be used to detect the signal strength of a wireless charging type signal emitted by an electronic device on the charging plane. In an embodiment of the present application, the signal strength of the wireless charging type signal can represent the strength of the wireless charging type signal. Optionally, the power or voltage of the wireless charging type signal detected in the detection area can be considered as the signal strength of the wireless charging type signal.

[0104] The control module 20 in the wireless charging device 1000A can select charging areas corresponding to some of the detection areas from the multiple detection areas as target areas based on the signal strength of the wireless charging type signal detected by at least one detection area. The control module 20 in the wireless charging device 1000A can drive the alignment mechanism 40 to move the transmitting coil 30 to the target area. The control module 20 can control the transmitting coil 30 to wirelessly charge the wireless charging receiving circuit in the target area.

[0105] Optionally, the control module 20 may, based on the signal strength of the wireless charging signal type signal detected in each detection area, select as the target area the charging area corresponding to all detection areas where the signal strength of the detected wireless charging type signal is greater than a first threshold. Alternatively, the control module 20 may, based on the signal strength of the wireless charging signal type signal detected in each detection area, select as the target area the charging area corresponding to the detection area where the signal strength of the detected wireless charging type signal is the largest. Alternatively, the control module 20 may determine the position of the wireless charging receiving circuit in the multiple detection areas based on the signal strength of the wireless charging signal detected in each detection area, and select as the target area the charging area corresponding to the detection area to which the position belongs.

[0106] The following describes the process of determining a limited area for the wireless charging device 1000A. In the detection coil array 10, multiple detection areas can be used to detect the signal strength of a near-field communication type signal emitted by an electronic device on the charging plane. In an embodiment of the present application, the signal strength of the near-field communication type signal can represent the strength of the near-field communication type signal. Optionally, the power or voltage of the near-field communication type signal detected in the detection area can be regarded as the signal strength of the near-field communication type signal.

[0107] The control module 20 in the wireless charging device 1000A can select, from the multiple detection areas, the charging areas corresponding to some of the detection areas as the defined areas based on the signal strength of the near-field communication type signal detected by at least one detection area. Alternatively, the control module 20 can select, from the multiple detection areas, the charging areas corresponding to all detection areas where the signal strength of the detected near-field communication type signal is greater than a second threshold as the defined areas based on the signal strength of the wireless charging signal type signal detected by each detection area. As shown in FIG4 , assuming that the multiple detection areas are detection area W1, detection area W2, detection area W3, and detection area W4, where the signal strength of the near-field communication type signal detected by detection area W2 and detection area W3 is greater than the second threshold, the charging areas corresponding to detection area W2 and detection area W3 can constitute the defined areas.

[0108] In one example, the control module 20 may control the alignment mechanism 40 to move the transmitting coil 30 to the target area based on whether the target area overlaps or overlaps the defined area, and control the wireless charging power of the transmitting coil 30 in the target area or the defined area to be less than or equal to the preset limit. For example, the control module 20 may control the alignment mechanism 40 to move the transmitting coil 30 to the target area, and control the wireless charging power of the transmitting coil 30 to be less than the preset limit.

[0109] In another example, the control module 20 may control the alignment mechanism 40 to move the transmitting coil 30 to the target area based on the non-overlapping of the target area and the limited area, and control the wireless charging power of the transmitting coil 30 to be greater than the preset limit value.

[0110] Based on the wireless charging device 1000A in any of the above embodiments, the detection coil array 10 in the wireless charging device 1000A can be set in a first printed circuit board (PCB). The first PCB can be set in the cavity of the wireless charging device 1000A, and the first PCB can be parallel to the charging plane of the wireless charging 1000A. The detection coil array 10 includes a plurality of first detection coils, the plurality of first detection coils are set on the first PCB, and the plurality of first detection coils are arranged along a first direction. The detection coil array 10 includes a plurality of second detection coils, the plurality of second detection coils are set on the first PCB, and the plurality of second detection coils are arranged along a first direction. The first direction is not parallel to the second direction. The aforementioned first resonant signal can be a resonant signal coupled to any one of the detection coils in the detection coil array 10. The first detection coil and the second detection coil can both be used to detect the wireless charging receiving circuit and the NFC circuit.

[0111] Figure 5A exemplifies a schematic diagram of the specific structure of a detection coil array 10. For example, the first direction is the row direction, and the second direction is the column direction, with the row direction perpendicular to the column direction. As shown in Figure 5A , the detection coil array 10 may include n detection coils arranged along the row direction and m detection coils arranged along the column direction. For ease of description, the detection coils arranged along the row direction are referred to as row coils R, with the i-th row coil being denoted as Ri. The detection coils arranged along the column direction are referred to as column coils C, with the j-th column coil being denoted as Cj. Optionally, the n row coils may be arranged in an overlapping manner to prevent zero magnetic flux coupling between the receiving coil and each row coil in the wireless charging receiving device. The m column coils may be arranged in an overlapping manner to prevent zero magnetic flux coupling between the receiving coil and each column coil in the wireless charging receiving circuit. This ensures that at least one coil in the detection coil array 10 can detect the receiving coil in the wireless charging receiving circuit. In practical scenarios, the number and size of the detection coils included in the detection coil array 10 are related to detection accuracy.

[0112] The row coils Ri may have a first end and a second end, with i ranging from 1 to n. The first end of each row coil is coupled to the control module 20, and the second end of each row coil is coupled to a common connection point P1. The column coils Cj may have a first end and a second end, with j ranging from 1 to m. The first end of each column coil is coupled to the control module 20, and the second end of each column coil is coupled to a common connection point P2.

[0113] In the detection coil array 10, the overlapping portion of the projection of a first detection coil on the charging plane and the projection of a second detection coil on the charging plane forms a detection area. The projection of the first detection coil on the charging plane can represent the projection of the first detection coil's detection range on the charging plane. The projection of the second detection coil on the charging plane can represent the projection of the second detection coil's detection range on the charging plane.

[0114] 5B exemplarily shows a schematic structural diagram of the control module 20. The control module 20 may include a control circuit 20A and a detection circuit 20B. The detection circuit 20B is coupled to each row coil R and each column coil C in the detection coil array 10.

[0115] 5C exemplarily shows the specific structure of the detection circuit 20B and the connection relationship between the detection circuit 20B and the corresponding detection coil array. The detection circuit 20B may include a first detection branch 21A and a second detection branch 21B.

[0116] First, the first detection branch 21A is introduced. The first detection branch 21A is coupled to each row of coils in the detection coil array. The first detection branch 21A may include a first excitation circuit 22A, a first acquisition circuit 23A, and a first gating switch circuit 24A.

[0117] The first side of the first gate switch circuit 24A includes a plurality of first connection terminals 24A1, which are respectively coupled to the row coils in the detection coil array 10. The second side of the first gate switch circuit 24A includes a second connection terminal 24A2, which is coupled to the output terminal of the first excitation circuit 22A and the input terminal of the sampling circuit 23A.

[0118] Under the control of the control circuit 20A, the first selection switch circuit 24A can connect the target first connection terminal 24A1 to the second connection terminal 24A2. The target first connection terminal 24A1 can be any of the aforementioned multiple first connection terminals 24A1. This connects the detection coil coupled to the target first connection terminal 24A1 to the output terminal of the first excitation circuit 22A, to which the second connection terminal 24A2 is connected, and to the input terminal of the first acquisition circuit 23A. For ease of description, the detection coil coupled to the target first connection terminal 24A1 is referred to as the target row coil. Exemplarily, the first selection switch circuit 24A may include multiple switches to achieve the aforementioned functions.

[0119] The output end of the first excitation circuit 22A can be coupled to the first selection switch circuit 24A. The first excitation circuit 22A can output a pulse signal, also referred to as an excitation signal, under the control of the control circuit 20A. For example, the first excitation circuit 22A may include an RLC network 22A1 and a first switch 22A2. A power supply VC can be coupled to the RLC network, and the power supply VC is used to provide a stable voltage to the first switch 22A2. The control circuit 20A can control the on-time or off-time of the first switch 22A2 to provide the pulse signal to the RLC network 22A1. The RLC network 22A1 is used to provide current limiting and voltage dividing functions for the pulse signal. Optionally, the RLC network may also have a filtering function.

[0120] The width and amplitude of this pulse signal can be changed under the control of the control circuit 20A. This pulse signal is transmitted to the target row coil via the first selection switch circuit 24A. This pulse signal acts on the target row coil, which, through coupling, transfers energy to the receiving coil in the wireless charging device. This can cause the receiving coil in the wireless charging device to self-resonate, and the resonant signal generated by the self-resonance of the receiving coil in the wireless charging device can be coupled to the target row coil.

[0121] The pulse signal acts on the target row coil, and the target row coil can transfer energy to the NFC circuit through coupling, so that the receiving coil in the NFC circuit can subsequently generate self-resonance, and the resonant signal generated by the self-resonance of the NFC circuit can be coupled to the target row coil.

[0122] The resonant signal coupled to the target row coil is transmitted to the input end of the first sampling circuit 23A via the first selection switch circuit 24A. The first sampling circuit 23A may include an RLC resonant matching network 23A1, a first detection branch, and a second detection branch.

[0123] The RLC resonant matching network 23A1 can receive the resonant signal coupled to the target row coil, perform impedance matching, and output the impedance-matched resonant signal to the first detection branch and the second detection branch respectively.

[0124] The first detection branch may include a filter BPF23A1. The operating frequency of the filter BPF23A1 may cover the first frequency, or cover the self-resonant frequency range of the NFC circuit. The filter BPF23A1 may filter the received resonant signal. If the resonant signal contains a signal of the first frequency, the filter BPF23A1 outputs the signal of the first frequency. If the resonant signal does not contain a signal of the first frequency, the filter BPF23A1 does not output the signal of the first frequency. Optionally, the first detection branch may include a peak detection circuit or an effective value detection circuit. The peak detection circuit may sample the voltage amplitude of the signal of the first frequency. The effective value detection circuit may sample the effective value of the voltage of the signal of the first frequency. In the embodiment of the present application, the first detection branch includes a peak detection circuit as an example. Exemplarily, the first detection branch includes a peak detection circuit T23A1. The peak detection circuit T23A1 may sample the voltage amplitude of the signal of the first frequency output by the filter BPF23A1 and output the sampled value to the control circuit 20A. The control circuit 20A may determine that the type of the resonance signal includes an NFC type signal based on the voltage sampling value output by the first detection branch being greater than the second voltage threshold.

[0125] Similarly, the second detection branch may include a filter BPF23A2. The operating frequency of the filter BPF23A2 may cover the second frequency, or cover the self-resonant frequency range of the receiving coil in the wireless charging receiving circuit. The filter BPF23A2 may filter the received resonant signal. If the resonant signal contains a signal of the second frequency, the filter BPF23A2 outputs the signal of the second frequency. If the resonant signal does not contain a signal of the second frequency, the filter BPF23A2 does not output the signal of the second frequency. Optionally, the second detection branch may include a peak detection circuit or an effective value detection circuit. The peak detection circuit may sample the voltage amplitude of the signal of the second frequency. The effective value detection circuit may sample the effective value of the voltage of the signal of the second frequency. In the embodiment of the present application, the first detection branch includes a peak detection circuit as an example. Exemplarily, the second detection branch includes a peak detection circuit T23A2. Peak detection circuit T23A2 can sample the voltage amplitude of the second frequency signal output by filter BPF23A2 and output the sampled value to control circuit 20A. Control circuit 20A can determine that the type of the resonant signal includes a wireless charging type signal based on the sampled value output by the second detection branch being greater than the first voltage threshold.

[0126] Optionally, the control module 20 can perform a detection operation on each row coil in the detection coil array 10 in a traversal manner. In an embodiment of the present application, in the control module 20, the control circuit 20A can control the first detection branch 21A to send a pulse signal to a row coil, and detect whether the resonant signal received by the row coil contains a signal of the first frequency and whether it contains a signal of the second frequency. This process can be recorded as performing a detection operation on a row coil. After the control module 20 performs a detection operation on one row coil, it performs a detection operation on another row coil. After the control module 20 performs a detection operation on each row coil in the detection coil array 10, it can be regarded as completing a traversal of all row coils in the detection coil array 10.

[0127] The second detection branch 21B is now described. The second detection branch 21B is coupled to each column of the detection coil array and may include a second excitation circuit 22B, a second sampling circuit 23B, and a second gating switch circuit 24B.

[0128] The first side of the second gate switch circuit 24B includes a plurality of third connection terminals 24B1, which are respectively coupled to the row coils in the detection coil array 10. The second side of the second gate switch circuit 24B includes a fourth connection terminal 24B2, which is coupled to the output terminal of the second excitation circuit 22B and the input terminal of the second sampling circuit 23B.

[0129] Under the control of control circuit 20A, second selection switch circuit 24B can connect a target third connection terminal 24B1 to a fourth connection terminal 24B2. Target third connection terminal 24B1 can be any first connection terminal among the aforementioned plurality of third connection terminals 24B1. This connects the detection coil coupled to target third connection terminal 24B1 to the output terminal of second excitation circuit 22B, to which fourth connection terminal 24B2 is connected, and to the input terminal of second sampling circuit 23B. For ease of description, the detection coil coupled to target third connection terminal 24B1 is referred to as a target column coil. Exemplarily, second selection switch circuit 24B may include multiple switches to achieve the aforementioned functions.

[0130] The output end of the second excitation circuit 22B can be coupled to the second selection switch circuit 24B. The second excitation circuit 22B can output a pulse signal, also referred to as an excitation signal, under the control of the control circuit 20A. Exemplarily, the second excitation circuit 22B may include an RLC network 22B1 and a second switch 22B2. A power supply VC can be coupled to the RLC network, and the power supply VC is used to provide a stable voltage to the switch 22A2. The control circuit 20A can control the on-time or off-time of the second switch 22B2 to provide a pulse signal to the RLC network 22B1. The RLC network 22B1 is used to provide current limiting and voltage dividing functions for the pulse signal. Optionally, the RLC network may also have a filtering function.

[0131] The width and amplitude of this pulse signal can be changed under the control of the control circuit 20A. This pulse signal is transmitted to the target column coil via the second selection switch circuit 24B. This pulse signal acts on the target column coil, which transfers energy to the receiving coil in the wireless charging device through coupling, causing the receiving coil in the wireless charging device to subsequently generate self-resonance. The resonant signal generated by the self-resonance of the receiving coil in the wireless charging device can then be coupled to the target column coil.

[0132] The pulse signal acts on the target column coil, and the target column coil can transfer energy to the NFC circuit through coupling, so that the receiving coil in the NFC circuit can subsequently generate self-resonance, and the resonant signal generated by the self-resonance of the NFC circuit can be coupled to the target column coil.

[0133] The resonant signal coupled to the target column coil is transmitted to the input end of the second sampling circuit 23B via the second gate switch circuit 24B. The second sampling circuit 23B may include an RLC resonant matching network 23B1, a third detection branch, and a fourth detection branch.

[0134] The RLC resonant matching network 23B1 can receive the resonant signal coupled to the target column coil, perform impedance matching, and output the impedance-matched resonant signal to the third detection branch and the fourth detection branch respectively.

[0135] The third detection branch may include a filter BPF23B1 and a peak detection circuit T23B1. In the third detection branch, the operating frequency of the filter BPF23B1 may cover the first frequency, or cover the self-resonant frequency range of the NFC circuit. The filter BPF23B1 may filter the received resonant signal. If the resonant signal contains a signal of the first frequency, the filter BPF23B1 outputs the signal of the first frequency. If the resonant signal does not contain a signal of the first frequency, the filter BPF23B1 does not output the signal of the first frequency. The peak detection circuit T23B1 may sample the voltage amplitude of the signal of the first frequency output by the filter BPF23B1 and output the sampled value to the control circuit 20A. The control circuit 20A may determine that the type of the resonant signal includes an NFC type signal based on the sampled value output by the third detection branch being greater than the second voltage threshold.

[0136] Similarly, the fourth detection branch may include a filter BPF23B2 and a peak detection circuit T23B2. In the fourth detection branch, the operating frequency of the filter BPF23B2 may cover the second frequency, or cover the self-resonant frequency range of the receiving coil in the wireless charging receiving circuit. The filter BPF23B2 may filter the received resonant signal. If the resonant signal contains a signal of the second frequency, the filter BPF23B2 outputs the signal of the second frequency. If the resonant signal does not contain a signal of the second frequency, the filter BPF23B2 does not output the signal of the second frequency. The peak detection circuit T23B2 may sample the voltage amplitude of the second frequency signal output by the filter BPF23B2 and output the sampled value to the control circuit 20A. The control circuit 20A may determine that the type of the resonant signal includes a wireless charging type signal based on the sampled value output by the fourth detection branch being greater than the first voltage threshold.

[0137] Optionally, the first detection branch 21A and the second detection branch 21B may operate synchronously, in parallel, or asynchronously. That is, the first detection branch 21A sends a pulse signal and detects the resonant signal coupled with the target row coil, while the second detection branch 21B sends a pulse signal and detects the resonant signal coupled with the target column coil. These two processes may be synchronous, in parallel, or asynchronous.

[0138] Optionally, the control module 20 can perform a detection operation on each column coil in the detection coil array 10 in a traversal manner. In an embodiment of the present application, in the control module 20, the control circuit 20A can control the second detection branch 21B to send a pulse signal to a column coil, and detect whether the resonant signal received by the column coil contains a signal of the first frequency and a signal of the second frequency. This process can be recorded as performing a detection operation on a column coil. After the control module 20 performs a detection operation on one column coil, it performs a detection operation on another column coil. After the control module 20 performs a detection operation on each column coil in the detection coil array 10, it can be considered that a traversal of all column coils in the detection coil array 10 has been completed.

[0139] The wireless charging device 1000A can determine that a wireless charging receiving circuit is placed in a charging area corresponding to a detection area based on the signal strength of the wireless charging type signals detected by the multiple first detection coils and the signal strength of the wireless charging type signals detected by the multiple second detection coils. Exemplarily, the control circuit 20A can select a row coil whose voltage amplitude of the wireless charging type signal is greater than the first voltage threshold based on a comparison result of the voltage amplitude of the wireless charging type signal detected by each row coil with a first voltage threshold. The control circuit 20A can select a column coil whose voltage amplitude of the wireless charging type signal is greater than the first voltage threshold based on a comparison result of the signal strength of the wireless charging type signal detected by each column coil with the first voltage threshold. The control circuit 20A determines that a wireless charging receiving circuit is placed in a charging area corresponding to at least one detection area formed by one of the selected row coils and one of the selected column coils.

[0140] The aforementioned target area may include a charging area corresponding to one or more detection areas determined based on one or more adjacent first detection coils and one or more adjacent second detection coils, wherein: the one or more adjacent first detection coils are determined based on the comparison result of the signal strength of the wireless charging type signal detected by the multiple first detection coils and the first threshold, and the one or more adjacent second detection coils are determined based on the comparison result of the signal strength of the wireless charging type signal detected by the multiple second detection coils and the first threshold.

[0141] The wireless charging device 1000A can select one or more adjacent first detection coils based on a comparison result of the signal strength of the wireless charging type signals detected by the multiple first detection coils with a first threshold. One or more adjacent second detection coils can be selected based on a comparison result of the signal strength of the wireless charging type signals detected by the multiple second detection coils with the first threshold. One or more detection areas are selected based on the selected one or more adjacent first detection coils and the selected one or more adjacent second detection coils, and the charging area corresponding to the selected one or more detection areas serves as the target area.

[0142] In one example, the control circuit 20A can select column coils whose wireless charging signals have a voltage amplitude greater than the first voltage threshold based on a comparison of the signal strength of the wireless charging signals detected by each column coil with a first voltage threshold. The control circuit 20A can select one or more detection areas based on the selected one or more adjacent row coils and the selected one or more adjacent column coils, where the selected one or more detection areas are formed by the selected one or more adjacent row coils and the selected one or more adjacent column coils. Exemplarily, the overlapping portion of the projection of the selected one or more adjacent row coils on the charging plane and the projection of the selected one or more adjacent column coils on the charging plane constitutes the selected one or more detection areas. The control circuit 20A can use the charging area corresponding to the selected one or more detection areas as the target area.

[0143] In another example, the detection coil array 10 can also be used to determine the position of the wireless charging receiving circuit within all detection areas on the charging plane. The detection coil array 10 in the wireless charging device 1000A can determine the position of the wireless charging receiving circuit on the charging plane based on the signal strength of the wireless charging type signal detected in at least one of the detection areas. The following describes the detection coil array 10's ability to detect the position of the wireless charging receiving circuit.

[0144] The position of the wireless charging receiving circuit may include the position in the aforementioned first direction and the position in the aforementioned second direction. Exemplarily, the position of the wireless charging receiving circuit may include the position row2_pos in the row direction and the position col2_pos in the column direction. For ease of introduction, please refer to Figure 5D. In the embodiment of the present application, a vertex of the first detection coil area in the row direction in the detection coil area on the last row in the column direction is used as the reference origin O, and a position reference coordinate system is set. The X-axis direction of the position reference coordinate system is the same as the row direction, and the Y-axis direction is opposite to the column direction. It should be noted that setting the position reference coordinate system facilitates clarifying the relationship between different positions. In actual applications, other methods can also be used to set the position reference coordinate system, and this application does not specifically limit this.

[0145] The control module 20 can use any detection coil array 10 to detect the row position row2_pos1 and column position col2_pos1 of the wireless charging receiving circuit in the detection area corresponding to the detection coil array 10, thereby controlling the alignment mechanism 40 to drive a transmitting coil to align with the position of the receiving coil of the electronic device. In this embodiment of the present application, detecting the position of the receiving coil in the wireless charging receiving circuit also means detecting the position of the receiving coil in the wireless charging receiving circuit.

[0146] The control module 20 can control the row coil Ri to send a pulse signal, and sample the amplitude of the second frequency signal in the resonant signal coupled by the row coil Ri to obtain the amplitude V2ri of the second frequency signal, where i ranges from 1 to n. That is, the control module 20 can traversally control each row coil in the detection coil array 10 to send a pulse signal, and sample the amplitude of the second frequency signal in the signal coupled by the row coil. The geometric center position of the row coil Ri is recorded as Lri, Lri=i+R0, and R0 is a preset parameter related to the coil size. Among them, the probability that the row coil Ri detects the wireless charging receiving circuit is recorded as Pri, where, In order to highlight the influence of the main detection value, the probability square method can be used to determine the recalculation probability of the row coil Ri According to the concept of statistics, the position of the wireless charging receiving circuit in the row direction in the charging plane can be obtained

[0147] Similarly, the control module 20 can control the column coil Cj to send a pulse signal, and sample the amplitude of the second frequency signal in the resonant signal coupled by the column coil Cj to obtain the amplitude V2cj of the second frequency signal, where j is traversed from 1 to m. That is, the control module 20 can traversally control each column coil in the detection coil array 10 to send a pulse signal, and sample the amplitude of the second frequency signal in the signal coupled by the column coil. The geometric center position of the column coil Cj is Lcj, Lcj=j+C0, and C0 is a preset parameter related to the coil size. Among them, the probability that the column coil Cj detects the wireless charging receiving circuit is recorded as P2cj, In order to highlight the influence of the main detection value, the probability square method can be used to determine the recalculation probability of the column coil Cj According to the concept of statistics, the position of the wireless charging receiving circuit in the column direction in the charging plane can be obtained

[0148] Optionally, the detection coil array 10 can detect the position of the wireless charging receiving circuit on the charging plane. The control module 20 can determine at least one detection area to which the determined position of the wireless charging receiving circuit on the charging plane belongs as a target area. This allows the alignment mechanism 40 to move the transmitting coil 30 to the target area, aligning the transmitting coil 20 with the wireless charging receiving circuit before wireless charging is performed, thereby improving wireless charging efficiency.

[0149] Alternatively, the detection coil array 10 can detect the position of the wireless charging receiving circuit on the charging plane. The control module 20 drives the alignment mechanism 40 to move the transmitting coil 30 so that the center of the charging area formed by the transmitting coil 30, as projected onto the charging plane, is close to or coincides with the position of the wireless charging receiving circuit. This improves the alignment between the transmitting coil 30 and the wireless charging receiving circuit, thereby increasing wireless charging efficiency.

[0150] The aforementioned limited area may include a charging area corresponding to one or more detection areas determined based on one or more adjacent first detection coils and one or more adjacent second detection coils, wherein: the one or more adjacent first detection coils are determined based on the comparison result of the signal strength of the near-field communication type signal detected by the multiple first detection coils and the second threshold, and the one or more adjacent second detection coils are determined based on the comparison result of the signal strength of the near-field communication type signal detected by the multiple second detection coils and the second threshold.

[0151] The wireless charging device 1000A can determine that an NFC circuit is placed in the charging area corresponding to a detection area based on the signal strength of the near-field communication type signals detected by the multiple first detection coils and the signal strength of the near-field communication type signals detected by the multiple second detection coils. Exemplarily, the control circuit 20A can select a row coil whose voltage amplitude of the near-field communication type signal is greater than the second voltage threshold based on a comparison result of the voltage amplitude of the near-field communication type signal detected by each row coil with a second voltage threshold. The control circuit 20A can select a column coil whose voltage amplitude of the near-field communication type signal is greater than the second voltage threshold based on a comparison result of the signal strength of the near-field communication type signal detected by each column coil with the second voltage threshold. The control circuit 20A determines that an NFC circuit is placed in the charging area corresponding to the detection area formed by one of the selected row coils and one of the selected column coils.

[0152] The wireless charging device 1000A can select one or more adjacent first detection coils based on a comparison result of the signal strength of the near-field communication type signals detected by the multiple first detection coils with a second threshold. One or more adjacent second detection coils can be selected based on a comparison result of the signal strength of the near-field communication type signals detected by the multiple second detection coils with a second threshold. One or more detection areas are selected based on the selected one or more adjacent first detection coils and the selected one or more adjacent second detection coils, and the charging area corresponding to the selected one or more detection areas serves as the limited area.

[0153] In one example, the control circuit 20A can select a column coil whose voltage amplitude of the near-field communication signal is greater than the second voltage threshold based on a comparison result of the signal strength of the near-field communication signal detected by each column coil with the second voltage threshold. The control circuit 20A can select one or more detection areas based on the selected one or more adjacent row coils and the selected one or more adjacent column coils, and the selected one or more detection areas are the detection areas formed by the selected one or more adjacent row coils and the selected one or more adjacent column coils. Exemplarily, the overlapping portion of the projection of the selected one or more adjacent row coils on the charging plane and the projection of the selected one or more adjacent column coils on the charging plane constitutes the selected one or more detection areas. The control circuit 20A can use the charging area corresponding to the selected one or more detection areas as the defined area.

[0154] In another example, for ease of illustration, assume that in the detection coil array 10, the resonant signals received by the q1 row coils include signals of the first frequency, and the resonant signals received by the q2 column coils also include signals of the first frequency. The control module 20 can determine or select a charging restriction zone corresponding to the NFC circuit based on the positions of the q1 row coils and the q2 column coils.

[0155] Figure 5E shows row coils Rz1 and Rz2, and column coils Cz1 and Cz2. In Figure 5E, the black origin represents the center of the coils. Row coil Rz1 is the first row coil in the row direction among the q1 row coils. Row coil Rz2 is the last row coil in the row direction among the q1 row coils. Column coil Cz1 is the first column coil in the column direction among the q2 column coils. Column coil Cz2 is the last column coil in the column direction among the q2 column coils.

[0156] Optionally, the control module 20 may use the entire detection area formed by each row coil between the row coil Rz1 and the row coil Rz2 and each column coil between the column coil Cz1 and the column coil Cz2 as the restricted area.

[0157] Alternatively, the control module 20 may determine or select the restricted area based on the center positions of the row coils Rz1, row coils Rz2, column coils Cz1, and column coils Cz2. For ease of description, the center positions of the coils are referred to as coil positions. The boundary vertices of the restricted area may be determined based on the positions of the row coils Rz1, row coils Rz2, column coils Cz1, and column coils Cz2. In the charging plane of the wireless charging device 1000A, the position of the row coil Rz1 in the row direction is x. Rz1 , the position of row coil Rz2 in the row direction is x Rz2 The position of the column coil Cz1 in the column direction is y Cz1 , the position of the column coil Cz2 in the column direction is y Cz2 .

[0158] For example, the restricted area is a rectangle. The four vertices of the restricted area are denoted as vertex W1, vertex W2, vertex W3, and vertex W4. In one example, the shaded portion in FIG5E shows the positions of the four vertices of the restricted area. The control module 20 can directly determine the position of the row coil Rz1 in the row direction, the position of the row coil Rz2 in the row direction, and the position of the column coil Cz1 in the column direction. Cz1 The position of the column coil Cz2 in the column direction determines the position of each vertex in the restricted area. Among them, the positions of vertex W1, vertex W2, vertex W3, and vertex W4 can be (x Rz1 ,y Cz1 )、(x Rz2 ,yCz1 )、(x Rz1 ,y Cz2 ) and (x Rz2 ,y Cz2 ).

[0159] Alternatively, the shaded portion in FIG5F shows the positions of the four vertices of the restricted area. The control module 20 may store the row reserved distance parameter xm and the column reserved distance parameter ym. The control module 20 may store the row reserved distance parameter xm, the column reserved distance parameter ym, the position of the row coil Rz1 in the row direction, the position of the row coil Rz2 in the row direction, and the position of the column coil Cz1 in the column direction ym. Cz1 The position of the column coil Cz2 in the column direction determines the position of each vertex of the restricted area. The positions of the vertex W1, the vertex W2, the vertex W3, and the vertex W4 can be (x Rz1 -xm,y Cz1 +ym)、(x Rz1 +xm,y Cz1 +ym)、(x Rz1 -xm,y Cz2 -ym) and (x Rz2 ,y Cz2 -ym).

[0160] In other possible designs, the restricted area can be circular or elliptical. Alternatively, the restricted area can be irregularly shaped. The shape of the restricted area can be determined through testing.

[0161] The above description clearly illustrates the various functions of the multiple first detection coils and multiple second detection coils in the detection coil array 10 provided in the embodiments of the present application, such as detecting the type of signals emitted by electronic devices, determining whether a wireless charging receiving circuit is placed in the charging area corresponding to a detection area, determining the position of the wireless charging receiving circuit on the charging plane, determining whether an NFC circuit is placed in the charging area corresponding to a detection area, and detecting the position of the NFC circuit on the charging plane. In some application scenarios, the multiple first detection coils and multiple second detection coils can perform one or more of these functions, and the embodiments of the present application do not impose any additional limitations on this.

[0162] In some application scenarios, the detection coil array 10 may include an NFC detection coil, the aforementioned multiple first detection coils, and multiple second detection coils. Among them, the projection of the NFC detection coil on the charging plane can cover the entire detection area included in the detection coil array 10. The NFC detection coil is used to detect the NFC circuit placed on the charging plane. Among them, the multiple first detection coils and the multiple second detection coils can realize one or more of the following functions, such as determining whether a wireless charging receiving circuit is placed in the charging area corresponding to a detection area, determining the position of the wireless charging receiving circuit on the charging plane, and detecting the position of the NFC circuit on the charging plane. The implementation method of the multiple first detection coils and the multiple second detection coils performing the aforementioned functions can be found in the relevant introduction in the aforementioned embodiment.

[0163] Figure 6A exemplarily shows a schematic diagram of the structure of another detection coil array 10. As shown in Figure 6A, the detection coil array 10 may include the aforementioned n detection coils arranged in the row direction, the aforementioned m detection coils arranged in the column direction, and an NFC detection coil NFCL. For the similarities between the structure shown in Figure 6A and the structure shown in Figure 5A, please refer to the relevant description of Figure 5A. In this embodiment, the NFC detection coil NFCL included in the detection coil array 10 can be used to determine whether an NFC circuit is present on the charging plane.

[0164] FIG6B exemplarily shows a schematic structural diagram of the control module 20. The control module 20 may include a control circuit 20A and a detection circuit 20B. The detection circuit 20B is coupled to the corresponding detection coil array. Exemplarily, the detection circuit 20B is coupled to each row coil R and each column coil C in the detection coil array 10. The control circuit 20A is coupled to the NFC detection coil NFCL. The control circuit 20A may include an NFC protocol card reader circuit. Optionally, the NFC protocol card reader circuit may support the NFC communication protocol. The NFC protocol card reader circuit may process the radio frequency signal or resonant signal received by the NFC detection coil NFCL to determine whether the signal received by the NFC detection coil NFCL is an NFC type signal, thereby detecting the signal type of the signal emitted by the electronic device placed on the charging plane.

[0165] 6C exemplarily shows the specific structure of the detection circuit 20B and the connection relationship between the detection circuit 20B and the corresponding detection coil array. The detection circuit 20B may include a first detection branch 21A and a second detection branch 21B.

[0166] First, the third detection branch 21C is introduced. The third detection branch 21C is coupled to each row of coils in the detection coil array. The third detection branch 21C may include a first excitation circuit 22A, a first gate switch circuit 24A, and a third sampling circuit 23C. The control module shown in FIG6C is similar to the control module shown in FIG5C and will not be described in detail here. For example, the first excitation circuit 22A and the first gate switch circuit 24A can be found in the description of the previous example and will not be repeated here.

[0167] The pulse signal output by the first excitation circuit 22A is transmitted to the target row coil via the first selection switch circuit 24A. This pulse signal acts on the target row coil, which, through coupling, transfers energy to the receiving coil in the wireless charging device. This causes the receiving coil in the wireless charging device to self-resonate, and the resonant signal generated by the self-resonance of the receiving coil in the wireless charging device can be coupled to the target row coil.

[0168] The resonant signal coupled to the target row coil is transmitted via first selection switch circuit 24A to the input of third sampling circuit 23C. Third sampling circuit 23C may include an RLC resonant matching network 23A1 and the aforementioned second detection branch. RLC resonant matching network 23A1 receives the resonant signal coupled to the target row coil, performs impedance matching, and then outputs the impedance-matched resonant signal to the second detection branch.

[0169] Exemplarily, the second detection branch may include the aforementioned filter BPF23A2 and the aforementioned peak detection circuit T23A2. The operating frequency of the filter BPF23A2 may cover the second frequency, or cover the self-resonant frequency range of the receiving coil in the wireless charging receiving circuit. The filter BPF23A2 may filter the received resonant signal. If the resonant signal contains a signal of the second frequency, the filter BPF23A2 outputs the signal of the second frequency. If the resonant signal does not contain a signal of the second frequency, the filter BPF23A2 does not output the signal of the second frequency. The peak detection circuit T23A2 may sample the voltage amplitude of the second frequency signal output by the filter BPF23A2 and output the sampled value to the control circuit 20A. The control circuit 20A may determine that the type of the resonant signal includes a wireless charging type signal based on the sampled value output by the second detection branch being greater than the first voltage threshold.

[0170] Optionally, the control module 20 can perform a detection operation on each row coil in the detection coil array 10 in a traversal manner. In an embodiment of the present application, in the control module 20, the control circuit 20A can control the third detection branch 21C to send a pulse signal to a row coil, and detect whether the resonant signal received by the row coil contains a signal of the second frequency. This process can be recorded as performing a detection operation on a row coil. After the control module 20 performs a detection operation on one row coil, it performs a detection operation on another row coil. After the control module 20 performs a detection operation on each row coil in the detection coil array 10, it can be regarded as completing a traversal of all row coils in the detection coil array 10.

[0171] The fourth detection branch 21D is now described. The fourth detection branch 21D is coupled to each column of the detection coil array. The second detection branch 21B may include a second excitation circuit 22B, a second gate switch circuit 24B, and a fourth sampling circuit 23D.

[0172] The pulse signal output by the second excitation circuit 22B is transmitted to the target column coil via the second selection switch circuit 24B. This pulse signal acts on the target column coil, which, through coupling, transfers energy to the receiving coil in the wireless charging device. This can cause the receiving coil in the wireless charging device to self-resonate, and the resonant signal generated by the self-resonance of the receiving coil in the wireless charging device can be coupled to the target column coil.

[0173] The resonant signal coupled to the target column coil is transmitted to the input of the fourth sampling circuit 23D via the second selection switch circuit 24B. The fourth sampling circuit may include an RLC resonant matching network 23B1 and the aforementioned fourth detection branch. The RLC resonant matching network 23B1 receives the resonant signal coupled to the target column coil, performs impedance matching, and then outputs the impedance-matched resonant signal to the fourth detection branch.

[0174] Exemplarily, the fourth detection circuit may include a filter BPF23B2 and a peak detection circuit T23B2. In the fourth detection branch, the operating frequency of the filter BPF23B2 may cover the second frequency, or cover the self-resonant frequency range of the receiving coil in the wireless charging receiving circuit. The filter BPF23B2 may filter the received resonant signal. If the resonant signal contains a signal of the second frequency, the filter BPF23B2 outputs the signal of the second frequency. If the resonant signal does not contain a signal of the second frequency, the filter BPF23B2 does not output the signal of the second frequency. The peak detection circuit T23B2 may sample the voltage amplitude of the second frequency signal output by the filter BPF23B2 and output the sampled value to the control circuit 20A. The control circuit 20A may determine that the type of the resonant signal includes a wireless charging type signal based on the sampled value output by the fourth detection branch being greater than the first voltage threshold.

[0175] Optionally, the control module 20 can perform a detection operation on each column coil in the detection coil array 10 in a traversal manner. In the embodiment of the present application, in the control module 20, the control circuit 20A can control the fourth detection branch 21D to send a pulse signal to a column coil and detect whether the resonant signal received by the column coil contains a signal of the second frequency. This process can be recorded as performing a detection operation on a column coil. After the control module 20 performs a detection operation on one column coil, it performs a detection operation on another column coil. After the control module 20 performs a detection operation on each column coil in the detection coil array 10, it can be considered that a traversal of all column coils in the detection coil array 10 has been completed.

[0176] Optionally, the first detection branch 21A and the second detection branch 21B may operate synchronously, in parallel, or asynchronously. That is, the first detection branch 21A sends a pulse signal and detects the resonant signal coupled to the target row coil, while the second detection branch 21B sends a pulse signal and detects the resonant signal coupled to the target column coil. These two processes may be synchronous, in parallel, or asynchronous.

[0177] The wireless charging device 1000A provided in any of the above embodiments. The wireless charging system 1000 provided in this application may include multiple wireless charging devices 1000A. The surface of the wireless charging system 1000 serves as a charging plane for placing at least one electronic device. The charging plane of the wireless charging system 1000 is formed by combining the charging planes of multiple wireless charging devices 1000A. The relative positional relationship of the charging planes of the multiple wireless charging devices 1000A can be any of the following positional relationships.

[0178] As shown in FIG. 7A , the charging planes of the plurality of wireless charging devices 1000A are arranged on the surface of the wireless charging system, and there are intervals between the charging planes of the plurality of wireless charging devices 1000A.

[0179] As shown in FIG7B , the charging planes of the multiple wireless charging devices 1000A are arranged on the surface of the wireless charging system, and there is no interval or overlap between the charging planes of the multiple wireless charging devices 1000A.

[0180] The charging planes of multiple wireless charging devices 1000A are arranged on the surface of the wireless charging system. In some application scenarios, the multiple charging planes are arranged in a row in the row direction. As shown in Figure 7C, the charging planes of multiple wireless charging devices 1000A are arranged on the surface of the wireless charging system, and the multiple charging planes are arranged in a row in the row direction, and the charging planes of two adjacent wireless charging devices 1000A overlap or intersect.

[0181] In other application scenarios, the multiple charging planes include multiple groups of charging planes. Each group of charging planes includes at least two charging planes along a row direction. The multiple groups of charging planes are arranged along a column direction. Optionally, the multiple groups of charging planes overlap or intersect.

[0182] As shown in Figure 7D, multiple charging planes, namely charging plane 10_1, charging plane 10_2, charging plane 10_3, and charging plane 10_4, are used as an example for description. The multiple charging planes include a first group of charging planes and a second group of charging planes. The first group of charging planes includes charging plane 10_1 and charging plane 10_2. The second group of charging planes includes charging plane 10_3 and charging plane 10_4. The first and second groups of charging planes are arranged in a column direction. Charging plane 10_1 and charging plane 10_2 are arranged in the first row, and charging plane 10_3 and charging plane 10_4 are arranged in the second row. The overlapping portion between charging plane 10_1 and charging plane 10_2 includes area S1 and area S2. The overlapping portion between charging plane 10_1 and charging plane 10_3 includes area S3 and area S2. The overlapping portion between charging plane 10_1 and charging plane 10_4 includes area S2. The overlapping portion between charging plane 10_2 and charging plane 10_3 includes area S2. The overlapping portion between the charging plane 10_2 and the charging plane 10_4 includes a region S2 and a region S4. The overlapping portion between the charging plane 10_3 and the charging plane 10_4 includes a region S2 and a region S5.

[0183] The projection of the range in which the transmitting coil of a wireless charging device 1000A can be wirelessly charged on the charging plane can be recorded as the charging range of the wireless charging device 1000A, or as the charging range of the transmitting coil. Optionally, in the case where there is overlap or charging between two adjacent charging planes, in one possible scenario, the charging ranges of the two adjacent wireless charging devices 1000A do not overlap or overlap. In another possible scenario, as shown in FIG7E , the charging ranges of the two adjacent wireless charging devices 1000A overlap or overlap. For the wireless charging receiving circuit placed in the area where the charging ranges of the two adjacent wireless charging devices 1000A overlap or overlap, the transmitting coils in the two adjacent wireless charging devices 1000A can both perform wireless charging for the wireless charging receiving circuit.

[0184] In one possible embodiment, in the wireless charging system 1000, the charging planes of two adjacent wireless charging devices 1000A overlap or intersect. The controller in the wireless charging system 1000 may include the control module 20 in each wireless charging device 1000A, and the controller includes the functions of the control module 20 in each of the aforementioned embodiments. The controller can determine the location of the wireless charging receiving circuit placed on the charging plane of each wireless charging device 1000A. For ease of description, the two adjacent wireless charging devices 1000A are respectively referred to as the first device and the second device. The charging plane of the first device is referred to as the first charging plane, and the charging plane of the second device is referred to as the second charging plane.

[0185] In response to the first device detecting that the position of the wireless charging receiving circuit is within the overlapping region of the first and second charging planes, the controller of wireless charging system 1000 can control the second device to detect the position of the wireless charging receiving circuit. The controller can detect the position of the wireless charging receiving circuit in the second charging plane through the second device, which is recorded as the row position row2_pos2 and the column position col2_pos2. The controller detects the position of the wireless charging receiving circuit in the second charging plane through the second device, i.e., the row position row2_pos2 and the column position col2_pos2, as described above and will not be repeated here.

[0186] For the wireless charging receiving circuit located in the overlapping area of ​​the two charging planes, the control module 20 can determine the position of the wireless charging receiving circuit through an average value algorithm, realize the position correction of the wireless charging receiving circuit, improve the alignment effect of the transmitting coil and the wireless charging receiving circuit, and thus improve the wireless charging efficiency.

[0187] The controller determines the final row position of the wireless charging receiving circuit as the average of the row position row2_pos1 of the wireless charging receiving circuit detected by the first device and the row position row2_pos2 of the wireless charging receiving circuit detected by the second device. The controller also determines the final column position of the wireless charging receiving circuit as the average of the column position col2_pos1 of the wireless charging receiving circuit detected by the first device and the column position col2_pos2 of the wireless charging receiving circuit detected by the second device. The controller can drive the alignment mechanism in the first device to move the transmitting coil to align with the wireless charging receiving circuit, and control the transmitting coil in the first device to wirelessly charge the wireless charging receiving circuit.

[0188] In one possible design, the charging plane of a first device overlaps with the charging planes of multiple other wireless charging devices. If the wireless charging receiving circuit is located in the overlapping area between the charging plane of the first device and the charging planes of S other wireless charging devices, where S is a positive integer, for each of the S other wireless charging devices, the controller may detect the position of the wireless charging receiving circuit within the charging plane of the wireless charging device through the wireless charging device. The controller may determine the final row position of the wireless charging receiving device as the average of the row position of the wireless charging receiving circuit detected by the first device, row2_pos1, and the row position of the wireless charging receiving circuit determined by each of the S wireless charging devices. The controller may also determine the final column position of the wireless charging receiving device as the average of the column position of the wireless charging receiving circuit detected by the first device, col2_pos1, and the column position of the wireless charging receiving circuit detected by each of the S other wireless charging devices.

[0189] For example, the controller may determine the position of the wireless charging receiving circuit in the overlapping area of ​​the charging planes of K wireless charging devices. The K wireless charging devices may include the aforementioned first device and the aforementioned S wireless charging devices, and K is equal to S+1. For easy distinction, among the K wireless charging devices, the control module 20 records the row direction position of the wireless charging receiving circuit detected by the ath wireless charging device as x2 a , and the column direction position of the wireless charging receiving circuit detected by the a-th wireless charging device is recorded as y2 a , a ranges from 1 to K. The controller can determine the final row direction position x2 of the wireless charging receiving circuit based on the row direction position of the wireless charging receiving circuit detected by each device in the K wireless charging devices. ad ,in The controller can determine the final column direction position y2 of the wireless charging receiving circuit according to the column direction position of the wireless charging receiving circuit detected by each device in the K wireless charging devices. ad ,in

[0190] In the wireless charging system 1000, the controller can select any one of the K wireless charging devices, determine one or more detection areas to which the corrected position of the wireless charging receiving circuit belongs in the multiple detection areas of the any one device, and use the charging area corresponding to the one or more detection areas to which the corrected position of the wireless charging receiving circuit belongs as the target area, and drive the alignment mechanism to move the transmitting coils that are not in working state in the K wireless charging devices to the target area. Exemplarily, the controller drives the alignment mechanism to move the first transmitting coil to the target area, wherein, among the center positions of the charging ranges of the transmitting coils that are not wirelessly charged, the center position of the charging range of the first transmitting coil is the closest to the position of the wireless charging receiving circuit. Optionally, the center position of the charging range of the transmitting coil is also the center position of the transmitting coil.

[0191] In the wireless charging system 1000, the controller can drive the alignment mechanism 40 in each wireless charging device. In the wireless charging system 1000, the alignment mechanism 40 in each wireless charging device can constitute an alignment module. The controller can control each alignment mechanism 40 in the alignment module. The alignment mechanism in a wireless charging device has a corresponding relationship with the transmitting coil. In one possible design, the controller can control the alignment mechanism 40 corresponding to the aforementioned first transmitting coil to drive the aforementioned first transmitting coil to align with the wireless charging receiving circuit based on the position of the wireless charging receiving circuit, so that the center position of the charging range of the first transmitting coil is close to the position of the wireless charging receiving circuit. The controller can have the ability to plan the moving path of the transmitting coil, and the controller can determine the moving path for aligning the first transmitting coil with the wireless charging receiving circuit. The controller can control the alignment mechanism 40 to drive the first transmitting coil to align with the wireless charging receiving circuit based on the determined moving path.

[0192] In the embodiment of the present application, each transmitting coil has a corresponding movable area. Figure 8A exemplifies the movable area of ​​the center of each transmitting coil. The movable area of ​​the center of the transmitting coil represents the range within which the center of the transmitting coil can move when the alignment mechanism 40 drives the transmitting coil to move.

[0193] In wireless charging system 1000, at least one second transmitting coil is located on the side of the first transmitting coil facing the wireless charging receiving circuit, and one of the at least one second transmitting coil is located on a path between the center of the charging area of ​​the first transmitting coil and the location of the wireless charging receiving circuit.

[0194] When the controller controls the alignment mechanism 40 to drive the first transmitting coil to align with the wireless charging receiving circuit, the controller can control the alignment mechanism 40 to drive the first transmitting coil to move at a first speed along the first direction toward the calibrated position of the wireless charging receiving circuit, and control the alignment mechanism 40 to drive the second transmitting coil to move at a second speed along the first direction away from the calibrated position of the wireless charging receiving circuit, wherein the second speed is greater than the first speed.

[0195] Figure 8B shows multiple transmitting coils included in a wireless charging system, designated as transmitting coil 1, transmitting coil 2, and transmitting coil 3, according to an exemplary embodiment. Transmitting coil 1 can be implemented as the first transmitting coil described above. Based on the positions of each transmitting coil, the controller can determine whether there are other transmitting coils located in the path between the center of the charging range of transmitting coil 1 and the wireless charging receiving circuit. It is assumed that transmitting coil 2 is located in the path between the center of the charging range of transmitting coil 1 and the wireless charging receiving circuit.

[0196] The controller controls the alignment module to synchronously move transmitting coil 2 and transmitting coil 1. For example, the controller may move transmitting coil 2 in a row direction away from the location of the wireless charging receiving circuit at a second speed. The controller may also move transmitting coil 1 in a row direction toward the location of the wireless charging receiving circuit at a first speed. The second speed is greater than the first speed. Synchronously driving transmitting coil 2 and transmitting coil 1 can reduce the duration of the alignment process between transmitting coil 1 and the wireless charging receiving circuit.

[0197] In one example, for ease of explanation, the straight line between the center of the current charging range of transmitting coil 1 and the center of the wireless charging receiving circuit is recorded as the first reference straight line. The controller can determine the movement range of the charging range of transmitting coil 1 after the center of the charging range of transmitting coil 1 moves along the first reference straight line. If the charging range of transmitting coil 2 overlaps with the movement range, the controller can determine that the position of transmitting coil 2 is located on the path between the center of the charging range of transmitting coil 1 and the wireless charging receiving circuit. Conversely, if the charging range of transmitting coil 2 does not overlap with the movement range, the controller can determine that the position of transmitting coil 2 is not located on the path between the center of the charging range of transmitting coil 1 and the wireless charging receiving circuit.

[0198] As shown in Figure 8C, black dot M1 represents the center of the charging range of transmitter coil 1, and black dot M2 represents the center of the receiving coil of the electronic device. Line L1 is drawn between the center of the charging range of transmitter coil 1 and the center of the wireless charging receiving circuit. The horizontal shaded area represents the movable range of the charging range of transmitter coil 1. For example, the charging range of transmitter coil 2 overlaps with this movable range, and the controller can determine that the position of transmitter coil 2 is located on the path between the center of the charging range of transmitter coil 1 and the wireless charging receiving circuit.

[0199] Then, the controller can control the alignment module to control the transmitting coil 2 to move in the row direction away from the position of the wireless charging receiving circuit, and the movement speed is a second speed. The controller can control the alignment module to control the transmitting coil 1 to move in the row direction toward the position of the wireless charging receiving circuit, and the movement speed is a first speed. The second speed is greater than the first speed.

[0200] Figure 9A shows an exploded view of a wireless charging system according to an exemplary embodiment. As shown in Figure 9A , the wireless charging system may include an upper housing 901A, a lower housing 901B, a detection PCB 902, at least one transmitting coil 903, a backing plate 904, an alignment module 905, and an inverter and control PCB 906.

[0201] The cavity formed by the cooperation of the upper shell 901A and the lower shell 901B can be used to accommodate the detection PCB 902, at least one transmitting coil 903, the lining plate 904, the alignment module and the inverter and control PCB 906. For example, the detection coil array of the wireless charging device in any of the above embodiments and the detection circuit coupled to each detection coil array can be set on the detection PCB 902. The lining plate 904 is arranged between the at least one transmitting coil 903 and the detection PCB 902. The alignment module can drive each transmitting coil 903 to move its position and align it with the wireless charging receiving circuit. The inverter and control PCB 906 can be provided with an inverter circuit and a controller in any of the above embodiments.

[0202] Optionally, at least one groove 907 is provided on the outer surface of the upper housing 901A of the wireless charging system. The present embodiment does not specifically limit the number of grooves 907; the number of grooves 907 can be equal to the number of transmitting coils. For example, if the wireless charging system includes three transmitting coils, the number of grooves 907 is also three.

[0203] Optionally, there is no groove 907 on the outer surface of the upper shell 901A of the wireless charging system, that is, it is a flat surface, which has a more beautiful appearance, a simple manufacturing process, and is easy to produce.

[0204] For example, as shown in Figure 9A , the wireless charging system may include three transmitting coils 903. An alignment module may be used to drive each transmitting coil. Figure 9B shows a schematic diagram illustrating the connection relationship between a detection PCB 902, three transmitting coils 903, an alignment module, and an inverter and control PCB 906, according to an exemplary embodiment.

[0205] The three transmitting coils 903 can be designated as a first transmitting coil 903A, a second transmitting coil 903B, and a third transmitting coil 903C. The alignment module 905 can include a guide rail and multiple alignment mechanisms. The multiple alignment mechanisms can be designated as a first motor module 905A, a second motor module 905B, and a third motor module 905C.

[0206] The first motor module 905A is mechanically connected to the first transmitting coil 903A and can drive the first transmitting coil 903A to move in the first direction and the second direction. The second motor module 905B is mechanically connected to the second transmitting coil 903B and can drive the second transmitting coil 903B to move in the first direction and the second direction. The third motor module 905C is mechanically connected to the third transmitting coil 903C and can drive the third transmitting coil 903C to move in the first direction and the second direction.

[0207] The inverter and control circuit PCB 906 houses a first motor drive circuit 9061A, a second motor drive circuit 9061B, and a third motor inverter circuit 9061C, which are used to control the first motor module 905A, the second motor module 905B, and the third motor module 905C, respectively. Each motor drive circuit is coupled to its corresponding motor module via motor control traces.

[0208] The inverter and control circuit PCB 906 also includes a first inverter circuit 9062A, a second inverter circuit 9062B, and a third inverter circuit 9062C. These are coupled to the first transmitting coil 903A, the second transmitting coil 903B, and the third transmitting coil 903C, respectively. Each inverter circuit is coupled to its corresponding transmitting coil via a transmit power trace, controlling the transmitting coil for wireless charging.

[0209] The inverter and control circuit PCB 906 also houses the controller from the control module 20 in any of the aforementioned embodiments. The controller can be coupled to each motor drive circuit to control it. The controller can also be coupled to each inverter circuit to control it. The controller can also be coupled to the detection circuit corresponding to any detection coil array on the detection PCB 902 to control each detection circuit to perform detection and obtain information provided by each detection circuit, such as the voltage amplitude of the signal of the first frequency and the voltage amplitude of the signal of the second frequency.

[0210] The structural exploded diagram of the wireless charging system provided in the embodiment of the present application is only used to illustrate the structural form of the wireless charging system, and is not intended to be a specific limitation on the structure of the wireless charging system.

[0211] For ease of understanding, FIG10 shows a functional schematic diagram of a wireless charging device according to an exemplary embodiment, based on the structure of the detection coil array of the wireless charging device shown in FIG5C. The wireless charging system provided in the embodiment of the present application may include a wireless charging receiving circuit position detection function, a restricted area determination function, a transmitting coil alignment function, and a target area determination function. Optionally, the wireless charging system may also include a system protection function and a transmitting coil wireless charging function.

[0212] In this embodiment, the system protection function of the wireless charging system is generally implemented based on the sampling protection circuit and controller in the wireless charging system. For example, the controller can implement the system protection function according to a preset protection method based on the voltage, current, temperature and other parameters collected by the sampling protection circuit.

[0213] The wireless charging function of the transmitting coil is generally based on the transmitting coil, foreign object detection circuit, in-band communication circuit, inverter circuit, and other components of the wireless charging system. For example, the foreign object detection circuit can detect foreign objects under the control of a controller, and the controller can also determine the restricted area corresponding to the foreign object based on its location. The controller can control the in-band communication circuit to communicate with the wireless charging receiving circuit, exchanging parameters required for the wireless charging process, such as the wireless charging power of the wireless charging receiving circuit. The transmitting coil is coupled to the inverter circuit, and the controller can adjust the wireless charging power of the transmitting coil by controlling the inverter circuit.

[0214] The wireless charging receiver circuit position detection function can be implemented based on the controller and each wireless charging receiver device. The controller can detect the position of the wireless charging receiver circuit through each wireless charging device. Optionally, if the charging planes of the wireless charging devices overlap, the controller can also correct the position of the wireless charging receiver circuit if the wireless charging receiver circuit is located in the overlapping area between multiple charging planes.

[0215] The restricted area determination function can be implemented by the controller and each wireless charging device. The controller determines the restricted area through any wireless charging device. Optionally, the wireless charging system can also include an NFC circuit position detection function, which can also be implemented by the controller and each wireless charging device.

[0216] The function of determining the chargeable area can be implemented based on the controller. The controller can record the portion of the multiple charging planes except the restricted area as the chargeable area.

[0217] The transmitter coil alignment function can be implemented based on a controller and an alignment module. The controller can control the alignment module to drive the transmitter coil so that the transmitter coil is aligned with the wireless charging receiving circuit.

[0218] FIG11 is a flow chart showing the operation process of a wireless charging system according to an exemplary embodiment. The operation process of the wireless charging system may include the following steps:

[0219] Step S1001 : obtaining information about foreign objects on the surface of the wireless charging system, information about a working transmitting coil, and information about a faulty transmitting coil.

[0220] The wireless charging system can control each transmitting coil to detect foreign objects. The wireless charging system can control each transmitting coil to detect foreign objects according to the foreign object detection method of the existing wireless charging system. The wireless charging system can determine the charging area corresponding to the transmitting coil where the foreign object is detected as the area where the foreign object is present based on the transmitting coil. Because the wireless charging system can control each transmitting coil to perform wireless charging, it can know the status of the transmitting coil that is working, the transmitting coil that is not working, and the transmitting coil that is faulty. Among them, the transmitting coil that is working can refer to the transmitting coil that is undergoing wireless charging, and the transmitting coil that is not working can refer to the transmitting coil that is not faulty and is not undergoing wireless charging.

[0221] Step S1002 , determining whether there is a foreign object on the surface of the wireless charging system or whether there is a working transmitting coil in the device. If so, step S1003 is executed next; if not, step S1004 is executed next.

[0222] Based on the information obtained in step S1001, the wireless charging system can determine whether there is a foreign object on the surface of the wireless charging system and whether there is a working transmitting coil in the system. If there is a foreign object on the surface of the wireless charging system or a working transmitting coil, the next step is to execute step S1003. If there is no foreign object on the surface of the wireless charging system and no working transmitting coil, the next step is to execute step S1004.

[0223] In step S1003, the wireless charging devices belonging to each charging plane in a first area scan and detect the wireless charging receiving circuit, where the first area is an area on the surface of the wireless charging system excluding an area where foreign objects exist, a charging area corresponding to a working transmitting coil, and a charging range corresponding to a faulty transmitting coil.

[0224] The wireless charging system may traverse and detect the wireless charging receiving circuit on each charging plane in the first area. For example, the wireless charging system may traverse and control each charging plane in the first area to detect the wireless charging receiving circuit.

[0225] Step S1004 : Scan and detect the wireless charging receiving circuit of the wireless charging device belonging to each charging plane on the surface of the wireless charging system.

[0226] The wireless charging system can detect wireless charging receiving circuits on each charging surface of the wireless charging system. For example, the wireless charging system can detect wireless charging receiving circuits on each charging surface. If a wireless charging receiving circuit is detected, step S1005 can be executed. If no wireless charging receiving circuit is detected, step S1001 can be repeated.

[0227] Step S1005 , calculating the position of the wireless charging receiving circuit.

[0228] When a wireless charging device on any charging plane detects the wireless charging receiving circuit, the wireless charging system can calculate the location of the wireless charging receiving circuit. Assuming that a wireless charging device on a first charging plane detects the wireless charging receiving circuit, the wireless charging system can detect the location of the wireless charging receiving circuit using the wireless charging device on the first charging plane.

[0229] Step S1006 , determining whether the position of the wireless charging receiving circuit is within the overlapping area of ​​the multiple charging planes, if so, executing step S1007 , if not, executing step S1008 .

[0230] Upon determining that the wireless charging receiving circuit is located within the overlapping region of multiple charging planes, the wireless charging system may adjust the position of the wireless charging system to improve wireless charging efficiency, and the next step is step S1007. If the wireless charging receiving circuit is not located within the overlapping region of any two charging planes, the position of the wireless charging receiving circuit may not be adjusted, and the next step is step S1008.

[0231] Step S1007: calibrate the position of the wireless charging receiving circuit.

[0232] Assuming the wireless charging receiving circuit is within the overlapping region of the first and second charging planes, the wireless charging system can utilize the wireless charging device associated with the second charging plane to detect the wireless charging receiving circuit and calculate its position. The wireless charging system can utilize the position of the wireless charging receiving circuit detected by the wireless charging device associated with the first charging plane and the position of the wireless charging receiving circuit detected by the wireless charging device associated with the second charging plane, and use the average of these two positions as the corrected position of the wireless charging receiving circuit.

[0233] Step S1008: Determine the movement path of at least one transmitting coil that needs to be moved according to a preset path determination method.

[0234] The wireless charging system can align a first transmitting coil with the wireless charging receiving circuit, where the first transmitting coil is positioned near the center of the charging range of the wireless charging receiving circuit. The wireless charging system can determine the motion path of the first transmitting coil and the wireless charging receiving circuit and determine whether there are other transmitting coils on the motion path. If there are other transmitting coils on the motion path, the motion paths of the other transmitting coils on the motion path are determined, and the other transmitting coils are directed to avoid the motion path.

[0235] Step S1009: Control the alignment module to move the at least one transmitting coil.

[0236] The wireless charging system can control each transmitting coil in the system, except the second transmitting coil, to avoid the movement path of the first transmitting coil and the movement path of the second transmitting coil. The second transmitting coil is the transmitting coil closest to the first transmitting coil on the movement path of the first transmitting coil. The wireless charging system can move the first transmitting coil and the second transmitting coil synchronously. In one possible embodiment, the wireless charging system can control the alignment module to drive the first transmitting coil to move at a first speed along a first direction, such as a row direction, toward the position corrected by the wireless charging receiving circuit, and control the alignment module to drive the second transmitting coil to move at a second speed along the first direction away from the position corrected by the wireless charging receiving circuit, wherein the second speed is greater than the first speed.

[0237] Step S1010: wirelessly charge the wireless charging receiving circuit.

[0238] The wireless charging system can control the first transmitting coil to wirelessly charge the wireless charging receiving circuit, initiating the wireless charging process for the transmitting coil. The wireless charging process for each transmitting coil can include steps such as foreign object detection, in-band communication, and charging control. Each step in the wireless charging process for a transmitting coil is independent of each other and can be executed in parallel. Optionally, after the wireless charging process ends, the transmitting coil can be driven by the positioning mechanism to move to the initial position. The initial position of each transmitting coil is preconfigured.

[0239] Optionally, after step S1010, the wireless charging system may further determine whether there is a fault in the system, and if so, protect the system by reducing rated power, shutting down, etc. If there is no fault, the wireless charging system may re-execute the operations in the above steps.

[0240] Obviously, those skilled in the art may make various modifications and variations to this application without departing from the scope of protection of this application. Thus, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application is intended to include such modifications and variations.

Claims

1. A wireless charging device, wherein the surface of the wireless charging device serves as a charging plane for placing at least one electronic device, wherein the at least one electronic device includes one or more of a near-field communication circuit and a wireless charging receiving circuit, characterized in that: The wireless charging device includes a detection coil array, the detection coil array includes multiple detection areas, the multiple detection areas respectively correspond to multiple charging areas of the charging plane, and the multiple detection areas are respectively used to detect the signal type of the signal emitted by the at least one electronic device placed on the charging plane, wherein, The wireless charging device is configured to adjust the power of wireless charging for the at least one electronic device in response to a signal type detected by at least one of the detection areas.

2. The wireless charging device according to claim 1, wherein: The wireless charging device is used for: In response to the signal type detected by at least one of the detection areas including a wireless charging type signal and a near field communication type signal, the power of wireless charging for the at least one electronic device is adjusted to be less than or equal to a preset limit value.

3. The wireless charging device according to any one of claims 1-2, wherein: The wireless charging device is used for: In response to the signal type detected by at least one of the detection areas including a wireless charging type signal and not including a near field communication type signal, the wireless charging device adjusts the power of wireless charging for the at least one electronic device to be greater than the preset limit value.

4. The wireless charging device according to any one of claims 1 to 3, wherein: The detection coil array is used to detect at least one of a near field communication type signal and a wireless charging type signal, wherein: The near field communication type signal includes one or more of a resonance signal generated by a receiving coil in a near field communication circuit and a communication signal generated by the near field communication circuit; and The wireless charging type signal includes one or more of a resonance signal generated by a receiving coil in a wireless charging receiving circuit and a communication signal generated by the wireless charging receiving circuit.

5. The wireless charging device according to any one of claims 1 to 4, wherein: The wireless charging device includes a transmitting coil and an alignment mechanism, wherein the alignment mechanism is used to move the transmitting coil. The multiple detection areas are respectively used to detect the signal strength of the wireless charging type signal emitted by the at least one electronic device. The alignment mechanism is used to: The transmitting coil is moved to a target area, where the target area includes a partial area of ​​the multiple detection areas, and the partial area is determined according to the signal strength of the wireless charging type signal detected by at least one of the detection areas.

6. The wireless charging device according to any one of claims 1 to 5, wherein: The plurality of detection areas are respectively used to detect the signal strength of a near field communication type signal emitted by the at least one electronic device, and the wireless charging device is used to: The power of wireless charging performed by the transmitting coil in a limited area is controlled to be less than or equal to the preset limit value, where the limited area includes a charging area corresponding to a portion of the detection areas determined from the multiple detection areas, where the determined portion of the detection areas is determined from the multiple detection areas based on a signal strength of a near-field communication type signal detected by at least one of the detection areas.

7. The wireless charging device according to any one of claims 1 to 6, wherein: The detection coil array comprises: A plurality of first detection coils are provided on the printed circuit board, wherein the plurality of first detection coils are arranged along a first direction, and two adjacent first detection coils among the plurality of first detection coils partially overlap; a plurality of second detection coils provided on the printed circuit board, the plurality of second detection coils being arranged along a second direction, two adjacent second detection coils among the plurality of second detection coils partially overlapping, and the second direction being non-parallel to the first direction; Wherein, the printed circuit board is parallel to the charging plane, the projections of the multiple first detection coils on the charging plane at least partially overlap with the projections of the multiple second detection coils on the charging plane, and the overlapping part of the projection of one first detection coil on the charging plane and the projection of one second detection coil on the charging plane forms a detection area.

8. The wireless charging device according to claim 7, wherein: The detection area is used to determine a detected signal type based on a wireless charging type signal or a near field communication type signal detected by at least one of the first detection coil or the second detection coil.

9. The wireless charging device according to claim 8, wherein: The detection coil array is used to: A wireless charging receiving circuit is placed in a charging area corresponding to a detection area, determined based on signal strengths of wireless charging type signals detected by the multiple first detection coils and signal strengths of wireless charging type signals detected by the multiple second detection coils.

10. The wireless charging device according to claim 9, wherein: The target area includes a charging area corresponding to one or more detection areas determined based on one or more adjacent first detection coils and one or more adjacent second detection coils, wherein: The one or more adjacent first detection coils are determined based on a comparison result between the signal strength of the wireless charging type signal detected by the multiple first detection coils and a first threshold value, and the one or more adjacent second detection coils are determined based on a comparison result between the signal strength of the wireless charging type signal detected by the multiple second detection coils and the first threshold value.

11. The wireless charging device according to claim 8, wherein: The detection coil array is used to: According to the signal strength of the near field communication type signals detected by the multiple first detection coils and the signal strength of the near field communication type signals detected by the multiple second detection coils, it is determined that the charging area corresponding to one or more of the detection areas is placed with a near field communication circuit.

12. The wireless charging device according to claim 11, wherein: The defined area includes a charging area corresponding to one or more detection areas determined based on one or more adjacent first detection coils and one or more adjacent second detection coils, wherein: The one or more adjacent first detection coils are determined based on the comparison results of the signal strength of the near-field communication type signals detected by the multiple first detection coils and the second threshold, and the one or more adjacent second detection coils are determined based on the comparison results of the signal strength of the near-field communication type signals detected by the multiple second detection coils and the second threshold.

13. A wireless charging system, characterized in that: The wireless charging system comprises a plurality of wireless charging devices as described in any one of claims 1 to 12, wherein the surface of the wireless charging system is used as a charging plane for placing at least one electronic device, and the charging plane of the wireless charging system is formed by combining the charging planes of the plurality of wireless charging devices.

Images