A wireless charging device and a wireless charging system

Abstract

The application provides a wireless charging device and a wireless charging system, which can avoid damage of an NFC circuit. A surface of the wireless charging device is used as a charging plane to place at least one electronic device, the at least one electronic device including one or more of a near field communication circuit or a wireless charging receiving circuit, and the wireless charging device includes a detection coil array including a plurality of detection areas corresponding to a plurality of charging areas of the charging plane respectively, the detection areas can have the ability to detect a signal type of a signal emitted by the electronic device, and the detection areas can realize detection of whether the electronic device on the charging plane includes the NFC circuit or the wireless charging receiving circuit. The wireless charging device can adjust power for wireless charging of the electronic device according to whether the electronic device on the charging plane includes the near field communication circuit or the wireless charging receiving circuit, and damage of the NFC circuit can be avoided.

Description

TECHNICAL FIELD

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

[0002] Wireless charging technology (WCT) uses a conduction medium such as an electric field, a magnetic field, a microwave or a laser to realize wireless transmission of electric energy. Due to its advantages such as no wire restriction and no plugging, the wireless charging technology is increasingly applied to electronic devices. At present, more and more electronic devices use wireless charging devices for wireless charging. For example, the electronic devices can be mobile phones and wearable devices. The wireless charging device includes a transmitting coil, and the electronic device includes a receiving coil.

[0003] At present, the wireless charging technology transmits energy through magnetic field coupling between the transmitting coil and the receiving coil. The transmitting coil and the receiving coil need to be located within a certain spatial distance. If a device containing a near field communication (NFC) circuit is placed by a user within the spatial distance, the transmitting coil and the receiving coil in the wireless charging device will damage the NFC circuit when performing wireless charging. SUMMARY

[0004] The present application provides a wireless charging device and a wireless charging system, which can avoid damage to the NFC circuit.

[0005] In a first aspect, an embodiment of the present application provides a wireless charging device, a surface of the wireless charging device serving as a charging plane for placing at least one electronic device, the at least one electronic device including one or more of a near field communication circuit or a wireless charging receiving circuit, the wireless charging device including a detection coil array, the detection coil array including a plurality of detection regions, the plurality of detection regions respectively corresponding to a plurality of charging regions of the charging plane, the plurality of detection regions respectively being configured to detect a signal type of a signal emitted by the at least one electronic device placed on the charging plane, and the wireless charging device being configured to adjust a power for wireless charging of the at least one electronic device in response to the signal type detected by at least one of the detection regions.

[0006] In an embodiment of the present application, the detection region has the capability of detecting the signal type of the signal emitted by the electronic device, so as to detect whether the electronic device on the charging plane includes the NFC circuit or the wireless charging receiving circuit. The wireless charging device can adjust the power for wireless charging of the electronic device according to whether the electronic device on the charging plane includes the NFC circuit or the wireless charging receiving circuit, so as to avoid damage to the NFC circuit.

[0007] In a possible design, the wireless charging device can adjust the power for wireless charging of the at least one electronic device to be less than or equal to a preset limit 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.

[0008] In the embodiments of this application, the signal type detected by at least one of the detection areas includes a wireless charging type signal and a near field communication type signal, which can reflect that the electronic device placed on the charging plane includes a wireless charging receiving circuit and an NFC circuit. The wireless charging device uses power less than or equal to a preset limit to perform wireless charging on the wireless charging receiving circuit, i.e., low-power wireless charging, which can prevent the NFC circuit from being damaged.

[0009] In a possible design, the wireless charging device can adjust the power for wireless charging of the at least one electronic device to be greater than the preset limit 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.

[0010] In the embodiments of this application, the signal type detected by at least one of the detection areas includes a wireless charging type signal and not includes a near field communication type signal, which can reflect that the electronic device placed on the charging plane includes a wireless charging receiving circuit and not includes an NFC circuit. The wireless charging device can perform wireless charging on the wireless charging receiving circuit on the charging plane according to a normal power. Optionally, the wireless charging device can interact with the wireless charging receiving circuit to obtain charging parameters based on a wireless charging technology, and perform wireless charging on the wireless charging receiving circuit using the charging parameters provided by the wireless charging receiving circuit. Generally, the wireless charging device uses the charging parameters provided by the wireless charging receiving circuit to perform wireless charging on the wireless charging receiving circuit with a power greater than the preset limit.

[0011] In a possible design, the detection coil array is configured to detect at least one of a near field communication type signal and a wireless charging type signal, where: 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.

[0012] In the embodiments of the present application, the NFC type signal can include any one of an NFC communication signal and an NFC resonance signal. The NFC communication signal is a communication signal sent by the NFC circuit based on an NFC communication protocol, i.e., a communication signal generated by the NFC circuit. The NFC resonance signal can be a resonance signal generated by a receiving coil in the NFC circuit, i.e., a resonance signal generated by the NFC circuit. The wireless charging type signal can include any one of a wireless charging communication signal and a wireless charging resonance signal. The wireless charging communication signal can be a communication signal sent by the wireless charging receiving circuit based on a wireless charging protocol, i.e., a communication signal generated by the wireless charging receiving circuit. The wireless charging resonance signal can be a resonance signal generated by a receiving coil in the wireless charging receiving circuit, i.e., a resonance signal generated by the wireless charging receiving circuit.

[0013] In a possible design, the wireless charging device includes a transmitting coil and an alignment mechanism, the alignment mechanism is configured to move the transmitting coil, the multiple detection regions are configured to detect signal strengths of the wireless charging type signals sent by the at least one electronic device respectively, and the alignment mechanism can be configured to move the transmitting coil to a target region, the target region includes part of the multiple detection regions, and the part of the multiple detection regions is determined according to the signal strengths of the wireless charging type signals detected by at least one of the detection regions.

[0014] In the embodiments 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 by the detection region can be regarded as the signal strength of the wireless charging type signal. The wireless charging device can include a transmitting coil and an alignment mechanism. The alignment mechanism can move the transmitting coil. The transmitting coil can be configured to perform wireless charging with the wireless charging receiving circuit. The wireless charging device can determine or select a charging region corresponding to part of the multiple detection regions as a target region, and the alignment mechanism can move the transmitting coil to the target region, so as to facilitate alignment of the transmitting coil with the wireless charging receiving circuit placed in the target region and improve the charging efficiency of the wireless charging receiving circuit.

[0015] In a possible design, the multiple detection regions are configured to detect signal strengths of the near field communication type signals sent by the at least one electronic device respectively, and the wireless charging device can control the power of the transmitting coil in a defined region to be less than or equal to the preset limit value according to the signal strengths of the near field communication type signals detected by at least one of the detection regions, the defined region includes a charging region corresponding to part of the multiple detection regions, and the part of the multiple detection regions is determined from the multiple detection regions according to the signal strengths of the near field communication type signals detected by at least one of the detection regions.

[0016] In the embodiments of the present application, the wireless charging device can determine the limited area corresponding to the NFC. For example, according to the signal strength of the near field communication type signal detected by 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 taken as the limited area. The limited area can represent an area that has an impact on the NFC circuit. If the wireless charging with normal power 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 limited value, so as to avoid damage to the NFC circuit in the limited area.

[0017] In a possible design, the detection coil array can include a plurality of first detection coils arranged on a printed circuit board, the plurality of first detection coils being arranged along a first direction, and adjacent two first detection coils of the plurality of first detection coils partially overlapping; and a plurality of second detection coils arranged on the printed circuit board, the plurality of second detection coils being arranged along a second direction, and adjacent two second detection coils of the plurality of second detection coils partially overlapping, the second direction being non-parallel to the first direction. The printed circuit board is parallel to the charging plane, a projection of the plurality of first detection coils on the charging plane at least partially overlaps a projection of the plurality of second detection coils on the charging plane, and an 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 one detection area.

[0018] In the embodiments of the present application, the detection coil array can include a plurality of first detection coils and a plurality of second detection coils. An 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 can 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 can achieve the signal type of the signal detected by one detection area.

[0019] In a possible design, the detection area can be used to determine the signal type of the detected signal according to 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.

[0020] In a possible design, the detection coil array can be used to determine that the wireless charging receiving circuit is placed in the charging area corresponding to one detection area according to the signal strength of the wireless charging type signal detected by the plurality of first detection coils and the signal strength of the wireless charging type signal detected by the plurality of second detection coils.

[0021] In a possible design, the target region includes a charging region corresponding to one or more of the detection regions determined according to one or more adjacent first detection coils and one or more adjacent second detection coils, where: the one or more adjacent first detection coils are determined according to a comparison result of signal strengths of wireless charging type signals detected by the plurality of first detection coils and a first threshold value, and the one or more adjacent second detection coils are determined according to a comparison result of signal strengths of wireless charging type signals detected by the plurality of second detection coils and the first threshold value.

[0022] In an embodiment of the present application, the wireless charging device can select one or more adjacent first detection coils according to a comparison result of signal strengths of wireless charging type signals detected by the plurality of first detection coils and a first threshold value, and select one or more adjacent second detection coils according to a comparison result of signal strengths of wireless charging type signals detected by the plurality of second detection coils and the first threshold value. One or more of the detection regions are selected according to the selected one or more adjacent first detection coils and the selected one or more adjacent second detection coils, and a charging region corresponding to the selected one or more detection regions is taken as the target region. The wireless charging device can select the first detection coils and the second detection coils according to signal strengths of wireless charging type signals detected by the first detection coils and the second detection coils, and the detection regions formed by the selected first detection coils and the selected second detection coils can be taken as the selected one or more detection regions. The charging region corresponding to the selected detection regions is taken as the target region, which can achieve 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, and improves the wireless charging efficiency.

[0023] In a possible design, the detection coil array can determine, according to signal strengths of near field communication type signals detected by the plurality of first detection coils and signal strengths of near field communication type signals detected by the plurality of second detection coils, a charging region corresponding to one or more of the detection regions in which a near field communication circuit is placed.

[0024] In a possible design, the target region includes a charging region corresponding to one or more of the detection regions determined according to one or more adjacent first detection coils and one or more adjacent second detection coils, where: the one or more adjacent first detection coils are determined according to a comparison result of signal strengths of near field communication type signals detected by the plurality of first detection coils and a second threshold value, and the one or more adjacent second detection coils are determined according to a comparison result of signal strengths of near field communication type signals detected by the plurality of second detection coils and the second threshold value.

[0025] In the embodiments of the present application, the wireless charging device can select one or more adjacent first detection coils according to a comparison result of the signal strength of the near field communication type signal detected by the plurality of first detection coils and the second threshold value. One or more adjacent second detection coils can be selected according to a comparison result of the signal strength of the near field communication type signal detected by the plurality of second detection coils and the second threshold value. One or more detection areas can be selected according to the selected one or more adjacent first detection coils and the selected one or more adjacent second detection coils, and a charging area corresponding to the selected one or more detection areas can be selected as the defined area. The wireless charging device can select the first detection coils and the second detection coils according to the signal strength of the near field communication type signal detected by the first detection coils and the second detection coils, and the detection area formed by the selected first detection coils and the selected second detection coils can be the selected one or more detection areas. The selected detection area corresponding to the defined area can realize the function of determining the position of the NFC circuit. The wireless charging power in the defined area is less than the preset limit value, which can avoid damage to the NFC circuit.

[0026] In a 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, and the decoding result includes an NFC start communication code, so that it can be determined that the type of the signal received by the detection coil array is an NFC type signal. Alternatively, the wireless charging device can determine that the type of the signal received by the detection coil array is an NFC type signal according to the fact that the signals respectively received by the first detection coil and the second detection coil in the detection coil array conform to the frame format specified in the NFC communication protocol. Alternatively, the wireless charging device can detect the frequency contained in the signals respectively received by the first detection coil and the second detection coil in the detection coil array, and if it is detected that the received signal contains a first frequency, it can be determined that the type of the 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.

[0027] In a possible design, the wireless charging device can determine that the type of the signal received by the detection coil array is a wireless charging type signal according to the fact that the signals respectively received by the first detection coil and the second detection coil in the detection coil array include the value of the header part specified in the wireless charging protocol. Alternatively, the wireless charging device can detect the frequency contained in the signals respectively received by the first detection coil and the second detection coil in the detection coil array, and if it is detected that the received signal contains a second frequency, it can be determined that the type of 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.

[0028] In a second aspect, the embodiments of the present application further provide a wireless charging system, which can include a plurality of wireless charging devices. Any wireless charging device can be any wireless charging device provided in the first aspect. A 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 plurality of wireless charging devices.

[0029] The charging plane of each wireless charging device is disposed on the 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 to the plurality of wireless charging devices. In response to detection of a wireless charging receiving circuit by at least one wireless charging device, the alignment module moves a first transmitting coil to align with the wireless charging receiving circuit, wherein among the transmitting coils that are not in an operating state in the plurality of first transmitting coils, the distance between the position of the first transmitting coil and the position of the wireless charging receiving circuit is the smallest among the distances between the positions of the transmitting coils and the position of the wireless charging receiving circuit.

[0030] In the embodiments of the present application, the alignment module can include an alignment mechanism in each wireless charging device. The plurality of transmitting coils included in the wireless charging system can be the transmitting coils in the plurality of wireless charging devices. The charging flexibility of the wireless charging system is improved, and the alignment module can uniformly schedule the transmitting coils to perform wireless charging for the wireless charging receiving circuit placed on the surface of the system. Wherein, the wireless charging system can respond to detection of a wireless charging receiving circuit by one wireless charging device, and move a first transmitting coil closest to the position of the one wireless charging device to align with the wireless charging receiving circuit, which can shorten the alignment time.

[0031] In a possible design, the alignment module can move the first transmitting coil and a target second transmitting coil to move in the same direction in response to at least one second transmitting coil being located on a path between the central position of the first transmitting coil and the position of the wireless charging receiving circuit, wherein 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, and the target second transmitting coil is the second transmitting coil closest to the first transmitting coil among the at least one second transmitting coil.

[0032] In the embodiments of the present application, when there are other transmitting coils on the moving path of the first transmitting coil, the alignment module can remove the other transmitting coils on the path. For the target second transmitting coil closest to the first transmitting coil on the path, the alignment mechanism can simultaneously move the target second transmitting coil and the first transmitting coil, in the same direction, and at different speeds, wherein the speed of the target second transmitting coil is greater than that of the first transmitting coil. The alignment module simultaneously moves the first transmitting coil and the target second transmitting coil, and can align the first transmitting coil with the wireless charging receiving circuit, thereby reducing the alignment time. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1A A schematic diagram of a wireless charging system is shown;

[0034] Figure 1B A schematic diagram of the structure of a wireless charging system is shown;

[0035] Figure 2 A schematic diagram of the structure of a wireless charging device is shown;

[0036] Figure 3A A schematic diagram of the position between two detection areas is shown;

[0037] Figure 3B A schematic diagram of the position between two detection areas is shown;

[0038] Figure 3C A schematic diagram of the position between two detection areas is shown;

[0039] Figure 3D A schematic diagram of the position between two detection areas is shown;

[0040] Figure 4 A schematic diagram of the position between multiple detection areas is shown;

[0041] Figure 5A A schematic diagram of the structure of a wireless charging device is shown;

[0042] Figure 5B A specific structure schematic diagram of a wireless charging device is shown;

[0043] Figure 5C A specific structure schematic diagram of a wireless charging device is shown;

[0044] Figure 5D A coordinate system schematic diagram of multiple detection areas of a wireless charging device is shown;

[0045] Figure 5E A schematic diagram of a defined area is shown;

[0046] Figure 5F A schematic view showing a defined area;

[0047] Figure 6A A schematic view showing a structure of a wireless charging device;

[0048] Figure 6B A schematic view showing a detailed structure of a wireless charging device;

[0049] Figure 6C A schematic view showing a detailed structure of a wireless charging device;

[0050] Figure 7A A schematic view showing a positional relationship of multiple charging planes in a wireless charging system;

[0051] Figure 7B A schematic view showing a positional relationship of multiple charging planes in a wireless charging system;

[0052] Figure 7C A schematic view showing a positional relationship of multiple charging planes in a wireless charging system;

[0053] Figure 7D A schematic view showing a positional relationship of multiple charging planes in a wireless charging system;

[0054] Figure 7E A schematic view showing a positional relationship of multiple charging planes in a wireless charging system;

[0055] Figure 8A A schematic view showing a positional relationship of multiple charging planes in a wireless charging system;

[0056] Figure 8B A schematic view showing a positional relationship of an electronic device and multiple charging planes in a wireless charging system;

[0057] Figure 8C A schematic view showing a moving range of a transmitting coil;

[0058] Figure 9A An exploded view showing a structure of a wireless charging system;

[0059] Figure 9B A schematic view showing a structure of a wireless charging system;

[0060] Figure 10 A functional schematic view showing a wireless charging system;

[0061] Figure 11 A flowchart showing a working process of a wireless charging system. DETAILED DESCRIPTION

[0062] The terms "first", "second", etc. in the following description are used only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second", etc. can be explicitly or implicitly included one or more of the features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise specified.

[0063] In addition, in the embodiments of the present application, the orientation terms such as "upper", "lower", etc. can include but not limited to the orientation defined by the relative position of the components shown in the drawings. It should be understood that these directional terms can be relative concepts, which are used for relative description and clarification, and can be changed accordingly according to the change of the position of the components shown in the drawings.

[0064] In the embodiments of the present application, unless otherwise specified and limited, the term "connection" should be understood in a broad sense, for example, "connection" can be fixed connection, or detachable connection, or integral; can be directly connected, or indirectly connected through intermediate medium. In addition, the term "coupling" can be an electrically connected manner for signal transmission. "Coupling" can be direct electrical connection, or indirect electrical connection through intermediate medium.

[0065] In the embodiments of the present application, the circuit including supporting NFC protocol or technology is referred to as NFC circuit. The receiving coil is usually provided in the NFC circuit for NFC communication. The device including the NFC circuit is referred to as NFC device. The form of the NFC device is not specifically limited in the embodiments of the present application. At present, the more common form is card type, such as identity card, bank card, etc.

[0066] In the embodiments of the present application, the circuit including supporting wireless charging protocol or technology is referred to as wireless charging receiving circuit. The device including the wireless charging receiving circuit is referred to as wireless charging receiving device. The receiving point coil is usually provided in the wireless charging receiving circuit for wireless charging. The wireless charging receiving circuit generally refers to the circuit that can charge the battery in the device or supply power to the load in the device by wireless charging mode. The type of the wireless charging receiving device is not specifically limited in the embodiments of the present application, for example, the wireless charging receiving device can be mobile phone, pad, computer with wireless transceiver function, smart wearable product (for example, smart watch, smart bracelet, earphone, etc.), virtual reality (VR) terminal device, augmented reality (AR) terminal device, etc. wireless device.

[0067] Embodiments of the present application relate to a wireless charging system for wireless charging of 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 the Type C interface is connected to an adapter, and the other end of the adapter is connected to a mains power supply, for example, an alternating current of 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 by the receiving coil, so that the energy coupled by the receiving coil can be converted to charge the battery in the electronic device.

[0068] Referring to Figure 1A The figure is a schematic diagram of a wireless charging system provided by embodiments of the present application. Figure 1A In the embodiment, the wireless charging system 1000 is only in a planar form, that is, the wireless charging system can be placed flat on a table when it is working. In addition, the wireless charging system 1000 provided by embodiments of the present application can also be in a three-dimensional form, for example, it can be placed on the table in other postures through a support. Figure 1A In the embodiment, the appearance of the wireless charging system is taken as an example of an oval shape. Embodiments of the present application do not limit the appearance of the wireless charging system, which can be circular, rectangular, etc. In addition, the wireless charging system can also be in a three-dimensional shape.

[0069] With the wide application of wireless charging systems in people's daily life, users often place NFC devices and electronic devices including receiving coils on the plane of the wireless charging system. When the transmitting coil in the wireless charging system performs wireless charging on the receiving coil of the electronic device, the electromagnetic waves transmitted between the transmitting coil and the receiving coil can damage the NFC circuit in the NFC device, causing the NFC device to malfunction.

[0070] Therefore, in order to avoid damaging the NFC circuit, the present application provides a wireless charging system with protection of NFC device function and a wireless charging device. The wireless charging system can include at least one wireless charging device, and the wireless charging device can have a function or capability to avoid damaging the NFC circuit.

[0071] The wireless charging system provided by embodiments of the present application can be used to wirelessly charge one or more wireless charging receiving devices. For example, Figure 1BAs shown, the wireless charging system can include a plurality of wireless charging devices 1000A. The surface of the wireless charging system 1000A can serve as a charging plane for placing at least one electronic device. The at least one electronic device placed on the charging plane can include one or more of an NFC circuit or a wireless charging receiving circuit. In the wireless charging system, the surface of each wireless charging device 1000A is in the same plane. In the wireless charging system, the charging planes of the plurality of wireless charging devices 1000A can be continuous, or there can be a gap between any two charging planes, or there can be an overlap between any two charging planes. 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.

[0072] The wireless charging device provided by the embodiment of the present application will be described below with reference to the accompanying drawings. Figure 2 As shown in the structural schematic diagram of the wireless charging device provided by the embodiment of the present application, the wireless charging device 1000A can include a detection coil array 10, a control module 20, and a transmitting coil 30. The detection coil array 10 can be used to detect the signal type of the signal emitted by the at least one electronic device placed on the charging plane. The transmitting coil 30 can be used for wireless charging. Optionally, to improve the degree of freedom of wireless charging, the wireless charging device further includes an alignment mechanism 40 coupled with the transmitting coil 30 in the wireless charging device. The alignment mechanism 40 can be used to move the transmitting coil 30. In some scenarios, the alignment mechanism 40 includes at least a motor, and generally one transmitting coil corresponds to two motors that can respectively drive the transmitting coil to move in a first direction and a second direction, wherein the first direction and the second direction are not parallel. The present embodiment does not make too many limitations on this. Optionally, the alignment mechanism 40 can include a guide rail. The control module 20 can be connected with the detection coil array 10, connected with the transmitting coil 30, and connected with the alignment mechanism 40. The control module 20 can control the detection coil array 10 to realize the ability of the detection coil array 10 to detect the signal type of the signal emitted by the electronic device. The control module 20 can control the transmitting coil 30 to realize the ability of the transmitting coil 30 to perform wireless charging and adjust the power of the transmitting coil 30 for wireless charging. Optionally, the control module 20 can control the alignment mechanism 40 to realize the ability of the alignment mechanism 40 to move the transmitting coil 30.

[0073] The detection coil array 10 can include a plurality of detection regions. The plurality of detection regions can respectively correspond to a plurality of charging regions of the charging plane. In embodiments of the present application, one detection region can correspond to one charging region, and one charging region can correspond to one detection region. A projection of one detection region on the charging plane can contain a projection of the charging region corresponding to the detection region on the charging plane, or a projection of one detection region on the charging plane overlaps with a projection of the charging region corresponding to the detection region on the charging plane. Among the plurality of detection regions, the positional relationship between two adjacent detection regions can be any of the following multiple examples:

[0074] Example 1, please see Figure 3A On the charging plane, a gap is provided between two adjacent detection regions. At this time, there is a gap between each charging region. Example 2, please see Figure 3B On the charging plane, two adjacent detection regions are continuous, and there can be no gap between the two detection regions. Example 3, please see Figure 3C On the charging plane, two adjacent detection regions can partially overlap. The charging regions corresponding to the two adjacent detection regions can not overlap. Example 4, please see Figure 3D On the charging plane, two adjacent detection regions can partially overlap, and the charging regions corresponding to the two adjacent detection regions can overlap, as Figure 3D The black shaded part in the figure shows the overlapping part of the charging region.

[0075] In one possible scenario, the plurality of detection regions can be arranged in a matrix. Among the plurality of detection regions, one detection region can have a detection region adjacent in a first direction and a detection region adjacent in a second direction. Wherein, the first direction and the second direction are not parallel. Optionally, the first direction can be perpendicular to the second direction. For ease of illustration, taking the first direction perpendicular to the second direction as an example, where the first direction is denoted as the row direction, and the second direction is denoted as the column direction. The positional relationship between two adjacent detection regions in the row direction can be any of the above examples 1-3. The positional relationship between two adjacent detection regions in the column direction can be any of the above examples 1-3.

[0076] The detection coil array 10 includes a plurality of detection regions for detecting a signal type of a signal emitted by the at least one electronic device placed on the charging plane. The signal type can include, but is not limited to, a signal emitted by the NFC circuit, a signal emitted by the wireless charging receiving circuit. For ease of introduction, in the present application, the signal emitted by the NFC circuit is simply denoted as an NFC type signal, and the signal emitted by the wireless charging receiving circuit is simply denoted as a wireless charging type signal. The NFC type signal can 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 an NFC communication protocol, i.e., a communication signal generated by the NFC circuit. The NFC resonance signal can be a resonance signal generated by a receiving coil in the NFC circuit, i.e., a resonance signal generated by the NFC circuit. The wireless charging type signal can include any one of a wireless charging communication signal and a wireless charging resonance signal. The wireless charging communication signal can be a communication signal emitted by the wireless charging receiving circuit based on a wireless charging protocol, i.e., a communication signal generated by the wireless charging receiving circuit. The wireless charging resonance signal can be a resonance signal generated by a receiving coil in the wireless charging receiving circuit, i.e., a resonance signal generated by the wireless charging receiving circuit.

[0077] First, the implementation of the detection coil array 10 detecting the signal type of the signal emitted by the electronic device placed on the charging plane is introduced. It can be understood that the detection coil array 10 can adopt a detection method including but not limited to the detection method provided in the embodiments of the present application to detect the signal type of the signal emitted by the electronic device.

[0078] In one possible detection method, the detection coil array 10 receives the signal emitted by the electronic device placed on the charging plane, and the control module 20 can determine the type of the signal received by the detection coil array 10.

[0079] The control module 20 can determine whether the signal received by the detection coil array 10 conforms to the NFC communication protocol. In one possible design, the control module 20 includes a start of communication code in the decoding result of the signal received by the detection coil array 10, and can determine that the type of the signal received by the detection coil array 10 is the NFC type signal. The control module 20 can determine that the type of the signal received by the detection coil array 10 is the NFC type signal according to the fact that the signal received by the detection coil array 10 conforms to the frame format specified in the NFC communication protocol.

[0080] Generally, the wireless charging between the wireless charging device and the 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 can send a signal carrying parameters of the wireless charging. The signal carrying the parameters of the wireless charging generally includes a header part and a parameter part. The value of the header part can reflect the specific type of the signal carrying the parameters, and the parameters are in the parameter part. The value of the header part can be the value of the header part specified in any wireless charging protocol. The control module 20 can determine that the type of the signal received by the detection coil array 10 is a wireless charging type signal according to the fact that the signal received by the detection coil array 10 includes the value of the header part specified in the wireless charging protocol.

[0081] In another possible detection mode, the control module 20 can determine the type of the received signal by using the frequency, intensity, or power of the signal received by the detection coil array 10. The following will be described in detail by taking the frequency of the signal received by the detection coil array 10 as an example.

[0082] The control module 20 can control the detection coil array 10 to send a pulse signal so that the coil of the electronic device placed on the charging plane resonates by itself and emits a resonance signal. The detection coil array 10 can receive the resonance signal generated by one or more electronic devices placed on the charging plane.

[0083] 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 placed on the charging plane includes an NFC circuit, the NFC circuit resonates by itself under the action of the pulse signal after receiving the pulse signal, and generates a resonance signal with a first frequency. The detection coil array 10 can couple to the resonance signal with the first frequency generated by the NFC circuit. The first frequency represents the resonance frequency of the receiving coil of the NFC circuit. Generally, the self-resonance frequency range of the NFC circuit includes a frequency around 13.56 MHz. For example, the self-resonance frequency range of the NFC circuit can be 13.56 MHz-7KHz~13.56 MHz+7KHz. Alternatively, the first frequency can be 13.56 MHz.

[0084] If the electronic device on the charging plane includes a receiving coil in the wireless charging receiving device, after the receiving coil in the wireless charging receiving device receives the pulse signal, the receiving coil self-resonates under the action of the pulse signal and generates a resonance signal with a second frequency. The detection coil array 10 can be coupled to the resonance signal with the second frequency generated by the wireless charging receiving circuit. The second frequency represents the resonance frequency of the receiving coil in the wireless charging receiving circuit. Generally, the self-resonance frequency of the receiving coil in the wireless charging receiving device ranges from 300 KHz to 1.5 MHz. Alternatively, the second frequency can be any frequency in the range of 300 kHz to 1.5 MHz.

[0085] For ease of introduction, the resonance signal coupled to or received by the detection coil array 10 is referred to as a first resonance signal. The control module 20 is coupled to the detection coil array 10. The control module 20 can have the ability to determine whether the first resonance signal includes a signal with the first frequency and whether the first resonance signal includes a signal with the second frequency. When the first resonance signal includes a signal with the first frequency, it can be represented that the signal type of the first resonance signal includes an NFC type signal. When the first resonance signal includes a signal with the second frequency, it can be represented that the signal type of the first resonance signal includes a wireless charging type signal.

[0086] In an embodiment of the present application, the signal type detected by the detection coil array 10 includes an NFC type signal, which can represent that an NFC circuit is placed on the charging plane. The signal type detected by the detection coil array 10 includes a wireless charging type signal, which can represent that a wireless charging receiving circuit is placed on the charging plane.

[0087] The wireless charging device 1000A can adjust the power of the wireless charging of the at least one electronic device placed on the charging plane in response to the signal type detected by the at least one detection area.

[0088] In an embodiment, the signal type emitted by the at least one electronic device placed on the charging plane can include an NFC type signal and not include a wireless charging type signal. The wireless charging device can control the transmitting coil in the charging area corresponding to the at least one detection area not to perform wireless charging in response to the signal type detected by the at least one detection area only including an NFC type signal. In an embodiment of the present application, the charging area corresponding to one detection area can be all or part of the range covered by the projection of the detection area on the charging plane.

[0089] For example, based on the wireless charging device provided in any one of the above examples, the control module 20 can not control the transmitting coil to perform wireless charging on 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.

[0090] In some possible scenarios, the control module 20 can not control the transmitting coil 30 to perform wireless charging on the electronic device in the charging area corresponding to the at least one detection area, or not control the transmitting coil 30 to perform wireless charging on 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 and not containing a signal of the second frequency.

[0091] In an embodiment, the signal type emitted by the at least one electronic device placed on the charging plane can contain a wireless charging type signal and not contain an NFC type signal, that is, there is a wireless charging receiving circuit on the charging plane, and there is no NFC circuit. The wireless charging device 1000A can adjust the power of the wireless charging performed on 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 the at least one detection area containing only the wireless charging type signal. For example, the wireless charging device 1000A can interact with the wireless charging receiving circuit based on the wireless charging technology and the charging parameter provided by the wireless charging receiving circuit, and perform wireless charging on the wireless charging receiving circuit by using the charging parameter provided by the wireless charging receiving circuit. Generally, the wireless charging device 1000A performs wireless charging on the wireless charging receiving circuit by using the charging parameter provided by the wireless charging receiving circuit, and the power is greater than the preset limit value.

[0092] In a possible design, in the detection coil array 10, a plurality of detection areas can be used to detect the signal strength of the wireless charging type signal emitted by the 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 by the detection area can be regarded as the signal strength of the wireless charging type signal.

[0093] The control module 20 in the wireless charging device 1000A can select, from the plurality of detection areas, a part of the detection areas corresponding to the charging areas as target areas according to the signal strength of the wireless charging type signal detected by the 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 areas. The control module 20 can control the transmitting coil 30 to perform wireless charging on the wireless charging receiving circuit in the target areas. It can be seen that the alignment mechanism 40 can move the transmitting coil 30 to the target areas, and the target areas include a part of the plurality of detection areas of the detection coil array 10, and the part of the areas can be determined according to the signal strength of the wireless charging type signal detected by the at least one detection area.

[0094] Optionally, the control module 20 can, based on the signal strength of the wireless charging signal type detected in each detection area, select the charging area corresponding to all detection areas where the signal strength of the detected wireless charging signal type is greater than a first threshold from multiple detection areas as the target area. For example... Figure 4 As shown, assuming multiple detection areas are detection area W1, detection area W2, detection area W3, and detection area W4, where the signal strength of the wireless charging type signal detected by detection area W2 and detection area W3 is greater than the first threshold, the control module 20 can construct the target area from the charging areas corresponding to detection area W2 and detection area W3.

[0095] Alternatively, the control module 20 can select the charging area corresponding to the detection area with the highest signal strength of the wireless charging type signal from multiple detection areas, based on the signal strength of the wireless charging type signal detected in each detection area. For example... Figure 4 As shown, assuming multiple detection areas are detection area W1, detection area W2, detection area W3, and detection area W4, among which the signal strength of the wireless charging type signal detected by detection area W2 is the largest, the control module 20 can make the charging area corresponding to detection area W2 into the target area.

[0096] Alternatively, the control module 20 can 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 use the charging area corresponding to the detection area to which that position belongs as the target area. For example... Figure 4 As shown, assuming multiple detection areas are detection area W1, detection area W2, detection area W3, and detection area W4, where the signal strength of the wireless charging type signal detected by detection areas W2 and W3 is greater than the first threshold, the control module 20 can calculate the position of the wireless charging receiving device based on the center position of detection areas W2 and W3 and the signal strength of the wireless charging type signal detected by detection areas W2 and W3, and calculate the charging area corresponding to the detection area to which the position of the wireless charging receiving device belongs, which can be determined as the target area.

[0097] In one embodiment, the signal type emitted by the at least one electronic device placed on the charging surface can include a wireless charging type signal and an NFC type signal, i.e., there is a wireless charging receiving circuit and an NFC circuit on the charging surface. In response to the signal type of the signal detected by the at least one detection area including a wireless charging type signal and an NFC type signal, the wireless charging device 1000A adjusts the power of the wireless charging to the at least one electronic device on the charging surface. The wireless charging device 1000A can be configured with a plurality of power adjustment strategies. The wireless charging device 1000A can implement any one of the plurality of power adjustment strategies.

[0098] For example, in response to the signal type of the signal detected by the at least one detection area including a wireless charging type signal and an NFC type signal, the wireless charging device 1000A adjusts the power of the wireless charging to the at least one electronic device on the charging surface to be less than or equal to a preset limit value. Optionally, the preset limit value can be 0, i.e., the wireless charging device 1000A does not perform wireless charging. Alternatively, the preset limit value is a preset numerical value, and the preset numerical value is not 0. The wireless charging device 1000A performs low-power charging. Optionally, the preset limit value can be 5.

[0099] For example, in response to the signal type of the signal detected by the at least one detection area including a wireless charging type signal and an NFC type signal, the wireless charging device 1000A determines or selects a target area and a limited area. The target area can represent one or more detection areas where the wireless charging receiving circuit is located. The limited area can represent one or more detection areas where the NFC circuit is located. The limited area includes a charging area corresponding to a part of the detection areas determined from the plurality of detection areas of the detection coil array 10, and the part of the detection areas determined from the plurality of detection areas can be determined according to the signal strength of the near field communication type signal detected by the at least one detection area.

[0100] If the target area and the limited area overlap, the wireless charging device 1000A can control the power of the wireless charging performed by the transmitting coil 30 in the target area or in the limited area to be less than or equal to the preset limit value. The overlap of the target area and the limited area can reflect that the position of the wireless charging receiving circuit and the position of the NFC receiving circuit are relatively close in the charging surface. The wireless charging device 1000A can control the power of the wireless charging performed by the transmitting coil 30 on the wireless charging receiving circuit to be less than or equal to the preset limit value, to achieve low-power wireless charging of the wireless charging receiving circuit, and to avoid damaging the NFC circuit.

[0101] If the target region has no overlap with the defined region, the wireless charging device 1000A can control the power of the transmitting coil in the target region to be greater than the preset defined value. The target region having no overlap with the defined region can reflect that the position of the wireless charging receiving circuit in the charging plane is far from the position of the NFC receiving circuit. The wireless charging device 1000A can control the transmitting coil 30 to wirelessly charge the wireless charging receiving circuit with a power greater than the preset defined value, to achieve wireless charging of the wireless charging receiving circuit. Optionally, the wireless charging device 1000A can interact with the wireless charging receiving circuit based on the wireless charging technology to obtain charging parameters. Generally, the wireless charging device 1000A uses the charging parameters provided by the wireless charging receiving circuit to wirelessly charge the wireless charging receiving circuit with a power greater than the power threshold.

[0102] The process of determining or selecting the target region by the wireless charging device 1000A is described below. In the detection coil array 10, a plurality of detection regions can be used to detect the signal strength of the wireless charging type signal emitted by the electronic device on the charging plane. In the embodiments 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 by the detection region can be regarded as the signal strength of the wireless charging type signal.

[0103] The control module 20 in the wireless charging device 1000A can select the charging region corresponding to part of the detection regions as the target region according to the signal strength of the wireless charging type signal detected by at least one detection region. 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 region. The control module 20 can control the transmitting coil 30 to wirelessly charge the wireless charging receiving circuit in the target region.

[0104] Optionally, the control module 20 can select, from the plurality of detection regions, the charging region corresponding to all the detection regions with a signal strength of the detected wireless charging type signal greater than a first threshold value, according to the signal strength of the wireless charging type signal detected by each detection region. Alternatively, the control module 20 can select, from the plurality of detection regions, the charging region corresponding to the detection region with the greatest signal strength of the detected wireless charging type signal, according to the signal strength of the wireless charging type signal detected by each detection region. Alternatively, the control module 20 can determine the position of the wireless charging receiving circuit in the plurality of detection regions according to the signal strength of the wireless charging signal detected by each detection region, and select the charging region corresponding to one detection region to which the position belongs as the target region.

[0105] The process of determining the defined area for the wireless charging device 1000A is described below. In the detection coil array 10, a plurality of detection areas can be used to detect the signal strength of the near field communication type signal emitted by the electronic device on the charging plane. In the embodiments 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 by the detection area can be regarded as the signal strength of the near field communication type signal.

[0106] The control module 20 in the wireless charging device 1000A can select the charging area corresponding to the part of the detection areas as the defined area according to the signal strength of the near field communication type signal detected by at least one detection area. Optionally, the control module 20 can select the charging area corresponding to all the detection areas as the defined area according to the signal strength of the near field communication type signal detected by each detection area, wherein the signal strength of the near field communication type signal detected by the detection area is greater than a second threshold value. As shown in Figure 4 For example, assuming that the plurality of detection areas are detection area W1, detection area W2, detection area W3 and detection area W4, wherein the signal strength of the near field communication type signal detected by the detection area W2 and the detection area W3 is greater than the second threshold value, and the charging area corresponding to the detection area W2 and the detection area W3 can constitute the defined area.

[0107] In one example, the control module 20 can control the alignment mechanism 40 to move the transmission coil 30 to the target area according to the overlap or overlap between the target area and the defined area, and control the power of the wireless charging of the transmission coil 30 in the target area or the defined area to be less than or equal to the preset limit value. For example, the control module 20 can control the alignment mechanism 40 to move the transmission coil 30 to the target area, and control the power of the wireless charging of the transmission coil 30 to be less than the preset limit value.

[0108] In another example, the control module 20 can control the alignment mechanism 40 to move the transmission coil 30 to the target area according to the non-overlap between the target area and the defined area, and control the power of the wireless charging of the transmission coil 30 to be greater than the preset limit value.

[0109] 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 disposed in a first printed circuit board (PCB). The first PCB can be disposed within the cavity of the wireless charging device 1000A, and the first PCB can be parallel to the charging plane of the wireless charging device 1000A. The detection coil array 10 includes a plurality of first detection coils, which are disposed on the first PCB and arranged along a first direction. The detection coil array 10 also includes a plurality of second detection coils, which are disposed on the first PCB and arranged along the first direction. The first direction and the second direction are not parallel. The aforementioned first resonant signal can be the resonant signal coupled to any one of the detection coils in the detection coil array 10. Both the first and second detection coils can be used to detect the wireless charging receiving circuit and the NFC circuit.

[0110] Figure 5A An exemplary schematic diagram of a detection coil array 10 is shown. Taking the first direction as the row direction and the second direction as the column direction as an example, the row direction and column direction are perpendicular. Figure 5A As shown, 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 explanation, the detection coils arranged along the row direction are called row coils R, where the i-th row coil is denoted as Ri. The detection coils arranged along the column direction are called column coils C, where the j-th column coil is denoted as Cj. Optionally, the n row coils can be overlapped to avoid the situation where the coupling magnetic flux between the receiving coil and each row coil in the wireless charging receiver is zero. The m column coils can also be overlapped to avoid the situation where the coupling magnetic flux between the receiving coil and each column coil in the wireless charging receiver circuit is zero. This ensures that at least one coil in the detection coil array 10 can detect the receiving coil in the wireless charging receiver circuit. In practical scenarios, the number and size of the detection coils included in the detection coil array 10 are related to the detection accuracy.

[0111] Row coil Ri can have a first end and a second end, where i ranges 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. Column coil Cj can have a first end and a second end, where j ranges 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.

[0112] In the detection coil array 10, a first detection coil and a second detection coil form a detection area in an overlapping part of projections of the first detection coil and the second detection coil on a charging plane. The projection of the first detection coil on the charging plane can represent a projection of a detection range of the first detection coil on the charging plane. The projection of the second detection coil on the charging plane can represent a projection of a detection range of the second detection coil on the charging plane.

[0113] Figure 5B An exemplary structural schematic diagram of the control module 20 is shown in FIG. 2. The control module 20 can include a control circuit 20A and a detection circuit 20B. The detection circuit 20B is coupled with each row of coils R in the detection coil array 10 and coupled with each column of coils C.

[0114] Figure 5C An exemplary specific structure of the detection circuit 20B and a connection relationship between the detection circuit 20B and the corresponding detection coil array are shown in FIG. 3. The detection circuit 20B can include a first detection branch 21A and a second detection branch 21B.

[0115] First, the first detection branch 21A is introduced. The first detection branch 21A is coupled with each row of coils in the detection coil array. The first detection branch 21A can include a first excitation circuit 22A, a first sampling circuit 23A, and a first gating switch circuit 24A.

[0116] The first side of the first gating switch circuit 24A includes a plurality of first connection ends 24A1, which are respectively coupled with each row of coils in the detection coil array 10. The second side of the first gating switch circuit 24A includes a second connection end 24A2, which is coupled with an output end of the first excitation circuit 22A and an input end of the sampling circuit 23A.

[0117] The first gating switch circuit 24A can be controlled by the control circuit 20A to connect a target first connection end 24A1 with the second connection end 24A2. The target first connection end 24A1 can be any one of the plurality of first connection ends 24A1. The target first connection end 24A1 is coupled with a target row of coils, and the second connection end 24A2 is connected with the output end of the first excitation circuit 22A and the input end of the first sampling circuit 23A. For convenience of introduction, the target first connection end 24A1 is coupled with a target row of coils. Exemplarily, the first gating switch circuit 24A can include a plurality of switches to achieve the above functions.

[0118] The output terminal of the first excitation circuit 22A can be coupled with the first gating 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 can include an RLC network 22A1 and a first switch 22A2. A power supply VC can be coupled with the RLC network, and the power supply VC is configured to provide a stable voltage to the first switch 22A2. The control circuit 20A can control the on duration or off duration of the first switch 22A2 to provide a pulse signal to the RLC network 22A1. The RLC network 22A1 is configured to limit the current and voltage of the pulse signal. Optionally, the RLC network can also have a filtering effect.

[0119] The width and amplitude of the pulse signal can be changed under the control of the control circuit 20A. The pulse signal is transmitted to the target row coil via the first gating switch circuit 24A. The pulse signal acts on the target row coil, and the target row coil can transmit energy to the receiving coil in the wireless charging device through coupling. The receiving coil in the wireless charging device can subsequently generate self-resonance, and the resonance signal generated by the self-resonance of the receiving coil in the wireless charging device can be coupled to the target row coil.

[0120] The pulse signal acts on the target row coil, and the target row coil can transmit energy to the NFC circuit through coupling. The receiving coil in the NFC circuit can subsequently generate self-resonance, and the resonance signal generated by the self-resonance of the NFC circuit can be coupled to the target row coil.

[0121] The resonance signal coupled to the target row coil is transmitted to the input terminal of the first sampling circuit 23A via the first gating switch circuit 24A. The first sampling circuit 23A can include an RLC resonance matching network 23A1, a first detection branch, and a second detection branch.

[0122] The RLC resonance matching network 23A1 can receive the resonance signal coupled to the target row coil, perform impedance matching, and output the impedance-matched resonance signal to the first detection branch and the second detection branch, respectively.

[0123] The first detection branch can include a filter BPF 23A1. The filter BPF 23A1 can cover the first frequency or the self-resonance frequency range of the NFC circuit. The filter BPF 23A1 can filter the received resonance signal, and output the signal of the first frequency if the resonance signal contains the signal of the first frequency. If the resonance signal does not contain the signal of the first frequency, the filter BPF 23A1 does not output the signal of the first frequency. Optionally, the first detection branch can include a peak detection circuit or a RMS detection circuit. The peak detection circuit can sample the voltage amplitude of the signal of the first frequency. The RMS detection circuit can sample the voltage RMS value of the signal of the first frequency. In the embodiments of the present application, the first detection branch includes the peak detection circuit as an example. For example, the first detection branch includes a peak detection circuit T23A1. The peak detection circuit T23A1 can sample the voltage amplitude of the signal of the first frequency output by the filter BPF 23A1, and output the sampling value to the control circuit 20A. The control circuit 20A can determine that the type of the resonance signal contains the NFC type signal according to the voltage sampling value output by the first detection branch being greater than the second voltage threshold.

[0124] Similarly, the second detection branch can include a filter BPF 23A2. The filter BPF 23A2 can cover the second frequency or the self-resonance frequency range of the receiving coil in the wireless charging receiving circuit. The filter BPF 23A2 can filter the received resonance signal, and output the signal of the second frequency if the resonance signal contains the signal of the second frequency. If the resonance signal does not contain the signal of the second frequency, the filter BPF 23A2 does not output the signal of the second frequency. Optionally, the second detection branch can include a peak detection circuit or a RMS detection circuit. The peak detection circuit can sample the voltage amplitude of the signal of the second frequency. The RMS detection circuit can sample the voltage RMS value of the signal of the second frequency. In the embodiments of the present application, the first detection branch includes the peak detection circuit as an example. For example, the second detection branch includes a peak detection circuit T23A2. The peak detection circuit T23A2 can sample the voltage amplitude of the signal of the second frequency output by the filter BPF 23A2, and output the sampling value to the control circuit 20A. The control circuit 20A can determine that the type of the resonance signal contains the wireless charging type signal according to the sampling value output by the second detection branch being greater than the first voltage threshold.

[0125] Optionally, the control module 20 can perform detection operation on each row coil in the detection coil array 10 in a traversal manner. In the embodiment of the present application, the control circuit 20A in the control module 20 can control the first detection branch 21A to send a pulse signal to one row coil, and detect whether the resonance signal received by the one row coil contains a signal of the first frequency and whether the resonance signal contains a signal of the second frequency. This process can be recorded as performing detection operation on one row coil. After the control module 20 performs detection operation on one row coil, the control module 20 performs detection operation on another row coil. After the control module 20 performs detection operation on each row coil in the detection coil array 10, it can be considered that the control module 20 completes traversal on all row coils in the detection coil array 10.

[0126] The second detection branch 21B will be introduced below. The second detection branch 21B is coupled with each column coil in the detection coil array. The second detection branch 21B can include a second excitation circuit 22B, a second sampling circuit 23B, and a second gating switch circuit 24B.

[0127] The first side of the second gating switch circuit 24B includes a plurality of third connection ends 24B1, which are respectively coupled with each row coil in the detection coil array 10. The second side of the second gating switch circuit 24B includes a fourth connection end 24B2, which is coupled with the output end of the second excitation circuit 22B and with the input end of the second sampling circuit 23B.

[0128] The second gating switch circuit 24B can be controlled by the control circuit 20A to connect a target third connection end 24B1 with the fourth connection end 24B2, the target third connection end 24B1 can be any one of the plurality of third connection ends 24B1, to connect the detection coil coupled with the target third connection end 24B1 with the output end of the second excitation circuit 22B connected with the fourth connection end 24B2, and with the input end of the second sampling circuit 23B. For the convenience of introduction, the detection coil coupled with the target third connection end 24B1 is recorded as a target column coil. Exemplarily, the second gating switch circuit 24B can include a plurality of switches to achieve the above functions.

[0129] The output terminal of the second excitation circuit 22B can be coupled with the second gating 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. For example, the second excitation circuit 22B can include an RLC network 22B1 and a second switch 22B2. A power supply VC can be coupled with the RLC network 22B1 to provide a stable voltage to the switch 22B2. 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 can limit the current and voltage of the pulse signal. Optionally, the RLC network 22B1 can also have a filtering effect.

[0130] The width and amplitude of the pulse signal can be changed under the control of the control circuit 20A. The pulse signal is transmitted to the target column coil via the second gating switch circuit 24B. The pulse signal acts on the target column coil, which can transfer energy to the receiving coil in the wireless charging device through coupling. The receiving coil in the wireless charging device can then generate self-resonance, and the resonance signal generated by the self-resonance of the receiving coil in the wireless charging device can be coupled to the target column coil.

[0131] The pulse signal acts on the target column coil, which can transfer energy to the NFC circuit through coupling. The receiving coil in the NFC circuit can then generate self-resonance, and the resonance signal generated by the self-resonance of the NFC circuit can be coupled to the target column coil.

[0132] The resonance signal coupled to the target column coil is transmitted to the input terminal of the second sampling circuit 23B via the second gating switch circuit 24B. The second sampling circuit 23B can include an RLC resonance matching network 23B1, a third detection branch, and a fourth detection branch.

[0133] The RLC resonance matching network 23B1 can receive the resonance signal coupled to the target column coil, perform impedance matching, and then output the impedance-matched resonance signal to the third detection branch and the fourth detection branch, respectively.

[0134] The third detection branch can include a filter BPF23B1 and a peak detection circuit T23B1. In the third detection branch, the filter BPF23B1 can cover the first frequency or the self-resonance frequency range of the NFC circuit. The filter BPF23B1 can filter the received resonance signal, and output the signal of the first frequency if the resonance signal contains the signal of the first frequency. If the resonance signal does not contain the signal of the first frequency, the filter BPF23B1 does not output the signal of the first frequency. The peak detection circuit T23B1 can sample the voltage amplitude of the signal of the first frequency output by the filter BPF23B1, and output the sampling value to the control circuit 20A. The control circuit 20A can determine that the type of the resonance signal contains the NFC type signal according to the sampling value output by the third detection branch being greater than the second voltage threshold.

[0135] Similarly, the fourth detection branch can include a filter BPF23B2 and a peak detection circuit T23B2. In the fourth detection branch, the filter BPF23B2 can cover the second frequency or the self-resonance frequency range of the receiving coil in the wireless charging receiving circuit. The filter BPF23B2 can filter the received resonance signal, and output the signal of the second frequency if the resonance signal contains the signal of the second frequency. If the resonance signal does not contain the signal of the second frequency, the filter BPF23B2 does not output the signal of the second frequency. The peak detection circuit T23B2 can sample the voltage amplitude of the signal of the second frequency output by the filter BPF23B2, and output the sampling value to the control circuit 20A. The control circuit 20A can determine that the type of the resonance signal contains the wireless charging type signal according to the sampling value output by the fourth detection branch being greater than the first voltage threshold.

[0136] Optionally, the first detection branch 21A and the second detection branch 21B can work synchronously, in parallel, or asynchronously. That is, the first detection branch 21A transmits a pulse signal and detects a resonance signal coupled by a target row coil, and the second detection branch 21B transmits a pulse signal and detects a resonance signal coupled by a target column coil. The two processes can be synchronous, parallel, or asynchronous.

[0137] Optionally, the control module 20 can perform detection operation on each column coil in the detection coil array 10 in a traversal manner. In the embodiment of the present application, the control circuit 20A in the control module 20 can control the second detection branch 21B to send a pulse signal to one column coil, and detect whether the resonance signal received by the one column coil contains a signal of the first frequency and a signal of the second frequency. This process can be recorded as performing detection operation on the one column coil. After the control module 20 performs detection operation on the one column coil, the control module 20 performs detection operation on another column coil. After the control module 20 performs detection operation on each column coil in the detection coil array 10 respectively, it can be considered that the control module 20 completes traversal on all column coils in the detection coil array 10.

[0138] The wireless charging device 1000A can determine that the charging area corresponding to one detection area is placed with a wireless charging receiving circuit according to the signal strength of the wireless charging type signal detected by the plurality of first detection coils and the signal strength of the wireless charging type signal detected by the plurality of second detection coils. For example, the control circuit 20A can select the row coil whose voltage amplitude of the wireless charging type signal is greater than the first voltage threshold according to the comparison result of the voltage amplitude of the wireless charging type signal detected by each row coil and the first voltage threshold. The control circuit 20A can select the column coil whose signal strength of the wireless charging type signal is greater than the first voltage threshold according to the comparison result of the signal strength of the wireless charging type signal detected by each column coil and the first voltage threshold. The control circuit 20A determines that the charging area corresponding to at least one detection area formed by one row coil selected from the selected row coils and one column coil selected from the selected column coils is placed with a wireless charging receiving circuit.

[0139] The target area can include the charging area corresponding to one or more detection areas determined according to 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 according to the comparison result of the signal strength of the wireless charging type signal detected by the plurality of first detection coils and the first threshold, and the one or more adjacent second detection coils are determined according to the comparison result of the signal strength of the wireless charging type signal detected by the plurality of second detection coils and the first threshold.

[0140] The wireless charging device 1000A can select one or more adjacent first detection coils according to a comparison result of the signal strength of the wireless charging type signal detected by the plurality of first detection coils and the first threshold value. The wireless charging device 1000A can select one or more adjacent second detection coils according to a comparison result of the signal strength of the wireless charging type signal detected by the plurality of second detection coils and the first threshold value. The wireless charging device 1000A can select one or more detection areas according to 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 the target area.

[0141] In one example, the control circuit 20A can select the column coil whose voltage amplitude of the wireless charging type signal is greater than the first voltage threshold value according to a comparison result of the signal strength of the wireless charging type signal detected by each column coil and the first voltage threshold value. The control circuit 20A can select one or more detection areas according to 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. For example, the selected one or more adjacent row coils and the selected one or more adjacent column coils overlap in the projection on the charging plane, and the overlapping part is the selected one or more detection areas. The control circuit 20A can select the charging area corresponding to the selected one or more detection areas as the target area.

[0142] In another example, the detection coil array 10 can also be used to determine the position of the wireless charging receiving circuit in 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 according to the signal strength of the wireless charging type signal detected by at least one detection area. The capability of the detection coil array 10 to detect the position of the wireless charging receiving circuit is described below.

[0143] The position of the wireless charging receiving circuit can include the position in the first direction and the position in the second direction. For example, the position of the wireless charging receiving circuit can include the row direction position row2_pos and the column direction position col2_pos. For ease of introduction, please refer to Figure 5DIn this embodiment, a vertex of the first detection coil region along the row direction within the detection coil region of the last row along the column direction is taken as the reference origin O, and a position reference coordinate system is set. The X-axis of the position reference coordinate system is in the same direction as the row direction, and the Y-axis is opposite to the column direction. It should be noted that setting a position reference coordinate system facilitates clarifying the relationship between different positions. In practical applications, other methods can also be used to set the position reference coordinate system, and this application does not specifically limit this.

[0144] The control module 20 can detect the row direction position (row2_pos1) and column direction position (col2_pos1) of the wireless charging receiving circuit in the detection area corresponding to any detection coil array 10, so as to control 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, detecting the position of the receiving coil in the wireless charging receiving circuit is also detecting the position of the receiving coil in the wireless charging receiving circuit.

[0145] The control module 20 can control the row coil Ri to send pulse signals and sample the amplitude of the second frequency signal in the resonant signal coupled to the row coil Ri to obtain the amplitude V2ri of the second frequency signal, where i takes values ​​from 1 to n. That is, the control module 20 can traversally control each row coil in the detection coil array 10 to send pulse signals and sample the amplitude of the second frequency signal in the signal coupled to that row coil. The geometric center position of the row coil Ri is denoted as Lri, where Lri = i + R0, and R0 is a preset parameter related to the coil size. The probability that the row coil Ri detects the wireless charging receiver circuit is denoted as Pri, where... To highlight the impact of key detection values, the probability squared method can be used to determine the recalculation probability of the row coil Ri. Based on statistical concepts, the position of the wireless charging receiver circuit in the row direction within the charging plane can be determined.

[0146] Similarly, the control module 20 can control the column coil Cj to send pulse signals and sample the amplitude of the second frequency signal in the resonant signal coupled to the column coil Cj to obtain the amplitude V2cj of the second frequency signal, where j iterates from 1 to m. That is, the control module 20 can traversely control each column coil in the detection coil array 10 to send pulse signals and sample the amplitude of the second frequency signal in the signal coupled to that column coil. The geometric center position of the column coil Cj is Lcj, where Lcj = j + C0, and C0 is a preset parameter related to the coil size. The probability that the column coil Cj detects the wireless charging receiver circuit is denoted as P2cj. To highlight the impact of the main detection value, the probability square method can be used to determine the recalculation probability of column coil Cj. Based on statistical concepts, the position of the wireless charging receiver circuit in the column direction within the charging plane can be determined.

[0147] Optionally, the detection coil array 10 can detect the position of the wireless charging receiver 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 receiver circuit on the charging plane belongs as the target area. This allows the alignment mechanism 40 to move the transmitting coil 30 to the target area, and wireless charging can be performed after the transmitting coil 20 is aligned with the wireless charging receiver circuit, thereby improving the wireless charging efficiency.

[0148] Alternatively, the detection coil array 10 can detect the position of the wireless charging receiver circuit on the charging plane. The control module 20 drives the alignment mechanism 40 to move the transmitting coil 30, so that the projection of the center position of the charging area formed by the transmitting coil 30 onto the charging plane is close to or coincides with the position of the wireless charging receiver circuit, thereby improving the alignment effect between the transmitting coil 30 and the wireless charging receiver circuit and increasing the wireless charging efficiency.

[0149] The aforementioned defined area may include a charging area corresponding to one or more of 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 a comparison result of the signal strength of the near-field communication type signal detected by the plurality of first detection coils and a second threshold, and the one or more adjacent second detection coils are determined based on a comparison result of the signal strength of the near-field communication type signal detected by the plurality of second detection coils and a second threshold.

[0150] 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 (NFC) signals detected by the plurality of first detection coils and the plurality of second detection coils. For example, the control circuit 20A can select row coils whose NFC signal voltage amplitude is greater than the second voltage threshold based on a comparison between the voltage amplitude of the NFC signal detected by each row coil and the second voltage threshold. Similarly, the control circuit 20A can select column coils whose NFC signal voltage amplitude is greater than the second voltage threshold based on a comparison between the signal strength of the NFC signal detected by each column coil and the second voltage threshold. The control circuit 20A determines that the charging area corresponding to the detection area formed by one of the selected row coils and one of the selected column coils contains the NFC circuit.

[0151] The wireless charging device 1000A can select one or more adjacent first detection coils based on a comparison between the signal strength of the near-field communication type signal detected by the plurality of first detection coils and a second threshold. It can also select one or more adjacent second detection coils based on a comparison between the signal strength of the near-field communication type signal detected by the plurality of second detection coils and the second threshold. Finally, it can select one or more detection areas based on the selected one or more adjacent first detection coils and the selected one or more adjacent second detection coils, with the charging area corresponding to the selected one or more detection areas serving as the defined area.

[0152] In one example, control circuit 20A can select column coils whose near-field communication signal voltage amplitude is greater than the second voltage threshold based on a comparison between the signal strength of the near-field communication signal detected by each column coil and the second voltage threshold. Control circuit 20A can select one or more detection regions based on the selected one or more adjacent row coils and one or more adjacent column coils, and the selected one or more detection regions are the detection regions formed by the selected one or more adjacent row coils and one or more adjacent column coils. For example, the overlapping portion of the projections of the selected one or more adjacent row coils onto the charging plane and the projections of the selected one or more adjacent column coils onto the charging plane constitutes the one or more detection regions at the selected location. Control circuit 20A can use the charging region corresponding to the selected one or more detection regions as the defined region.

[0153] In another example, for illustrative purposes, assume that in the detection coil array 10, the resonant signals received by q1 row coils contain signals of a first frequency, and the resonant signals received by q2 column coils contain signals of a first frequency. The control module 20 can determine or select the charging restriction area corresponding to the NFC circuit based on the positions of the q1 row coils and q2 column coils.

[0154] Figure 5E The diagram shows row coil Rz1, row coil Rz2, column coil Cz1, and column coil Cz2. Figure 5E In the diagram, the center position of the coil is represented by a black dot. Row coil Rz1 is the first row coil in the q1 row coils along the row direction. Row coil Rz2 is the last row coil in the q1 row coils along the row direction. Column coil Cz1 is the first column coil in the q2 column coils along the column direction. Column coil Cz2 is the last column coil in the q2 column coils along the column direction.

[0155] Optionally, the control module 20 can use the entire detection area formed by each row coil between row coil Rz1 and row coil Rz2 and each column coil between column coil Cz1 and column coil Cz2 as the restricted area.

[0156] Alternatively, the control module 20 can determine or select the restricted area based on the center positions of row coil Rz1, row coil Rz2, column coil Cz1, and column coil Cz2. For ease of explanation, the center position of the coils will be referred to as the coil position below. The boundary vertices of the restricted area can be determined based on the positions of row coil Rz1, row coil Rz2, column coil Cz1, and column coil Cz2. In the charging plane of the wireless charging device 1000A, the position of row coil Rz1 in the row direction is x. Rz1 The position of the horizontal coil Rz2 in the horizontal direction is x. Rz2 The column coil Cz1 is positioned y in the column direction. Cz1 The position of column coil Cz2 in the column direction is y. Cz2 .

[0157] For example, the restricted area is rectangular. The four vertices of the restricted area are denoted as vertex W1, vertex W2, vertex W3, and vertex W4. In one example, Figure 5E The shaded area in the diagram shows the positions of the four vertices of the restricted region. The control module 20 can directly determine the positions of row coil Rz1 and row coil Rz2 in the row direction, and column coil Cz1 in the column direction based on their respective positions. Cz1 The position of column coil Cz2 in the column direction determines the position of each vertex of the restricted region. The positions of vertices W1, W2, W3, and W4 can be (x...) Rz1 y Cz1 ), (x Rz2 y Cz1 ), (x Rz1 y Cz2 ) and (x Rz2 y Cz2 ).

[0158] Or perhaps, Figure 5F The shaded area in the diagram indicates the positions of the four vertices of the restricted area. Control module 20 can store row reservation distance parameters xm and column reservation distance parameters ym. Control module 20 can then base its actions on the stored row reservation distance parameters xm, column reservation distance parameters ym, the position of row coil Rz1 in the row direction, the position of row coil Rz2 in the row direction, and the position of column coil Cz1 in the column direction. Cz1 The position of column coil Cz2 in the column direction determines the position of each vertex of the restricted region. The positions of vertices W1, W2, W3, and 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).

[0159] In other possible designs, the restricted area can be circular or elliptical. Alternatively, the restricted area can be an irregular shape. The shape of the restricted area can be determined through testing.

[0160] Through the above description, the various functions of the multiple first detection coils and multiple second detection coils in the detection coil array 10 provided in this application embodiment can be clarified, such as detecting the signal type of the signal emitted by the electronic device, 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 this application embodiment does not impose excessive limitations on this.

[0161] In some application scenarios, the detection coil array 10 may include an NFC detection coil, the aforementioned plurality of first detection coils, and a plurality of second detection coils. The projection of the NFC detection coil onto the charging plane can cover the entire detection area included in the detection coil array 10. The NFC detection coil is used to detect NFC circuits placed on the charging plane. The plurality of first and second detection coils can perform 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 methods of the plurality of first and second detection coils performing the aforementioned functions can be found in the relevant descriptions in the foregoing embodiments.

[0162] Figure 6A An exemplary schematic diagram of another detection coil array 10 structure is shown. (As shown) Figure 6A As shown, the detection coil array 10 may include the aforementioned n detection coils arranged along the row direction, the aforementioned m detection coils arranged along the column direction, and the NFC detection coil NFCL. Figure 6A The structure shown is Figure 5A For structures that are identical to those shown, please refer to [link / reference]. Figure 5AThe relevant information is as follows. In this embodiment, the NFC detection coil NFCL included in the detection coil array 10 can be used to determine whether an NFC circuit exists on the charging plane.

[0163] Figure 6B A schematic diagram of the control module 20 is shown as an example. The control module 20 may include a control circuit 20A and a detection circuit 20B. The detection circuit 20B is coupled to a corresponding detection coil array. For example, 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 can 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 emitted by an electronic device placed on the charging plane.

[0164] Figure 6C The specific structure of the detection circuit 20B and its connection relationship with the corresponding detection coil array are illustrated exemplarily. The detection circuit 20B may include a first detection branch 21A and a second detection branch 21B.

[0165] First, the third detection branch 21C will be 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 gating switch circuit 24A, and a third sampling circuit 23C. Figure 6C The control module shown is Figure 5C The similarities between the control modules shown will not be repeated here. For example, the first excitation circuit 22A and the first gating switch circuit 24A can be found in the relevant descriptions in the previous examples, and will not be repeated here.

[0166] The pulse signal output by the first excitation circuit 22A is transmitted to the target row coil via the first gating switch circuit 24A. The pulse signal acts on the target row coil, which transfers energy to the receiving coil in the wireless charging device through coupling. This causes the receiving coil in the wireless charging device to subsequently generate self-resonance, 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.

[0167] The resonant signal coupled to the target row coil is transmitted to the input of the third sampling circuit 23C via the first gating switch circuit 24A. The third sampling circuit 23C may include an RLC resonant matching network 23A1 and the aforementioned second detection branch. 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 second detection branch.

[0168] For example, the second detection branch may include the aforementioned filter BPF23A2 and the aforementioned peak detection circuit T23A2. The operating frequency of filter BPF23A2 may cover the second frequency, or cover the self-resonant frequency range of the receiving coil in the wireless charging receiver circuit. Filter BPF23A2 can filter the received resonant signal. If the resonant signal contains a signal of the second frequency, filter BPF23A2 outputs the signal of the second frequency. If the resonant signal does not contain a signal of the second frequency, filter BPF23A2 does not output the signal of the second frequency. 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 a first voltage threshold.

[0169] Optionally, the control module 20 can perform detection operations on each row coil in the detection coil array 10 in a traversal manner. In this embodiment, 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 that row coil contains a signal of the second frequency. This process can be recorded as performing a detection operation on a row coil. After performing a detection operation on one row coil, the control module 20 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 considered that all row coils in the detection coil array 10 have been traversed.

[0170] The fourth detection branch 21D is described below. The fourth detection branch 21D is coupled to each column of coils in the detection coil array. The second detection branch 21B may include a second excitation circuit 22B, a second gating switch circuit 24B, and a fourth sampling circuit 23D.

[0171] The pulse signal output by the second excitation circuit 22B is transmitted to the target column coil via the second gating 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. This causes the receiving coil in the wireless charging device to subsequently generate self-resonance, 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.

[0172] The resonant signal coupled to the target column coil is transmitted to the input of the fourth sampling circuit 23D via the second gating 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 can receive the resonant signal coupled to the target column coil, perform impedance matching, and output the impedance-matched resonant signal to the fourth detection branch.

[0173] For example, 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 receiver circuit. The filter BPF23B2 can 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 can 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 can 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 a first voltage threshold.

[0174] Optionally, the control module 20 can perform detection operations on each column coil in the detection coil array 10 in a traversal manner. In this embodiment, the control circuit 20A in the control module 20 can control the fourth detection branch 21D to send a pulse signal to a column coil and detect whether the resonant signal received by that column coil contains a signal of the second frequency. This process can be recorded as performing a detection operation on a column coil. After performing a detection operation on a column coil, the control module 20 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 all column coils in the detection coil array 10 have been traversed.

[0175] Optionally, the first detection branch 21A and the second detection branch 21B can 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, and the second detection branch 21B sends a pulse signal and detects the resonant signal coupled to the target column coil; these two processes can be synchronous, in parallel, or asynchronous.

[0176] 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, and 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.

[0177] like Figure 7A As shown, multiple wireless charging devices 1000A have charging planes disposed on the surface of the wireless charging system, and there is a gap between the charging planes of the multiple wireless charging devices 1000A.

[0178] like Figure 7B As shown, the charging planes of multiple wireless charging devices 1000A are arranged on the surface of the wireless charging system, and there are no gaps or overlaps between the charging planes of the multiple wireless charging devices 1000A.

[0179] Multiple 1000A wireless charging planes are arranged on the surface of the wireless charging system. In some applications, these charging planes are arranged in a row. For example... Figure 7C As shown, multiple charging planes of wireless charging devices 1000A are disposed on the surface of the wireless charging system. The multiple charging planes are arranged in a row in the row direction, and there is overlap or overlap between the charging planes of two adjacent wireless charging devices 1000A.

[0180] In other application scenarios, multiple charging planes comprise multiple sets of charging planes. Each set of charging planes includes at least two charging planes along the row direction. Multiple sets of charging planes are arranged along the column direction. Optionally, the multiple sets of charging planes may overlap or intersect.

[0181] like Figure 7DAs shown, multiple charging planes, namely charging plane 10_1, charging plane 10_2, charging plane 10_3, and charging plane 10_4, are used as examples for illustration. 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 along a column direction. Charging plane 10_1 and charging plane 10_2 are located in the first row, and charging plane 10_3 and charging plane 10_4 are located in the second row. The overlapping portion between charging plane 10_1 and charging plane 10_2 includes regions S1 and S2. The overlapping portion between charging plane 10_1 and charging plane 10_3 includes region S3 and region S2. The overlapping portion between charging plane 10_1 and charging plane 10_4 includes region S2. The overlapping portion between charging plane 10_2 and charging plane 10_3 includes region S2. The overlapping portion between charging plane 10_2 and charging plane 10_4 includes regions S2 and S4. The overlapping portion between charging plane 10_3 and charging plane 10_4 includes regions S2 and S5.

[0182] The projection of the range within which the transmitting coil of a wireless charging device 1000A can wirelessly charge onto the charging plane can be denoted as the charging range of the wireless charging device 1000A, or simply as the charging range of the transmitting coil. Optionally, in cases where there is overlap or charging between adjacent charging planes, one possible scenario is that the charging ranges of two adjacent wireless charging devices 1000A do not overlap or intersect. Another possible scenario is, as... Figure 7E As shown, the charging ranges of two adjacent wireless charging devices 1000A overlap. For wireless charging receiving circuits placed within the overlapping or intersecting charging ranges of two adjacent wireless charging devices 1000A, the transmitting coils in both adjacent wireless charging devices 1000A can wirelessly charge the receiving circuit.

[0183] In one possible implementation, 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 the aforementioned embodiments. The controller can determine the position of the wireless charging receiving circuit placed on the charging plane of each wireless charging device 1000A. For ease of explanation, 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.

[0184] The controller of the wireless charging system 1000 can control the second device to detect the position of the wireless charging receiving circuit in response to the first device detecting that the position of the wireless charging receiving circuit is located within the overlapping area of ​​the first charging plane and the second charging plane. The controller can detect the position of the wireless charging receiving circuit in the second charging plane through the second device, denoted as row position row2_pos2 and column position col2_pos2. The controller's detection of the position of the wireless charging receiving circuit in the second charging plane through the second device, i.e., row position row2_pos2 and column position col2_pos2, can be referred to the aforementioned relevant explanations and will not be repeated here.

[0185] For a wireless charging receiving circuit located in the overlapping area of ​​two charging planes, the control module 20 can determine the position of the wireless charging receiving circuit through an average value algorithm, thereby correcting the position of the wireless charging receiving circuit, improving the alignment effect between the transmitting coil and the wireless charging receiving circuit, and thus improving the wireless charging efficiency.

[0186] The controller determines the final row position of the wireless charging receiver circuit by averaging the row position row2_pos1 detected by the first device and the row position row2_pos2 detected by the second device. Similarly, the controller determines the final column position of the wireless charging receiver circuit by averaging the column position col2_pos1 detected by the first device and the column position col2_pos2 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 receiver circuit and control the transmitting coil in the first device to wirelessly charge the wireless charging receiver circuit.

[0187] In one possible design, the charging plane of the first device overlaps with the charging planes of multiple other wireless charging devices. If the position of the wireless charging receiver 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 can detect the position of the wireless charging receiver circuit in the charging plane of that device. The controller can determine the final row position of the wireless charging receiver circuit by taking the row position (row2_pos1) detected by the first device and the average of the row positions determined by each of the S other wireless charging devices. The controller can also determine the final column position of the wireless charging receiver circuit by taking the column position (col2_pos1) detected by the first device and the average of the column positions detected by each of the S other wireless charging devices.

[0188] For example, the controller can 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, where K equals S+1. For clarity, among the K wireless charging devices, the control module 20 records the row-direction position of the wireless charging receiving circuit detected by the a-th wireless charging device as x2. a And the column direction position of the wireless charging receiver circuit detected by the a-th wireless charging device is denoted as y2. a Let a be a series of values ​​from 1 to K. The controller can determine the final row direction position x2 of the wireless charging receiver circuit based on the row direction position detected by each of the K wireless charging devices. ad ,in The controller can determine the final column orientation position y2 of the wireless charging receiver circuit based on the column orientation positions detected by each of the K wireless charging devices. ad ,in

[0189]

[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 within the multiple detection areas of that device to which the corrected position of the wireless charging receiving circuit belongs, 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. The controller then drives the alignment mechanism to move the non-operating transmitting coils among the K wireless charging devices to the target area. For example, the controller drives the alignment mechanism to move the first transmitting coil to the target area, wherein the center position of the charging range of each of the non-wireless charging transmitting coils is 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 itself.

[0191] In the wireless charging system 1000, the controller can drive the alignment mechanism 40 in each wireless charging device. The alignment mechanisms 40 in each wireless charging device can constitute an alignment module. The controller can control each alignment mechanism 40 in the alignment module. Each alignment mechanism in a wireless charging device corresponds to a transmitting coil. In one possible design, the controller can control the alignment mechanism 40 corresponding to the 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 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 movement path of the transmitting coil, and can determine the movement path for the first transmitting coil to align with the wireless charging receiving circuit. The controller can control the alignment mechanism 40 to align the first transmitting coil with the wireless charging receiving circuit based on the determined movement path.

[0192] In this embodiment, each transmitting coil has a corresponding movable area. Figure 8A The movable area at the center of each transmitting coil is illustrated exemplarily. The movable area at the center of the transmitting coil represents the range within which the center of the transmitting coil can be moved when the alignment mechanism 40 drives the transmitting coil to move.

[0193] In the wireless charging system 1000, at least one second transmitting coil is provided 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 the path between the center of the charging area of ​​the first transmitting coil and the position 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, it can control the alignment mechanism 40 to drive the first transmitting coil to move toward the corrected position of the wireless charging receiving circuit along the first direction at a first speed, and control the alignment mechanism 40 to drive the second transmitting coil to move away from the corrected position of the wireless charging receiving circuit along the first direction at a second speed, wherein the second speed is greater than the first speed.

[0195] Figure 8B An exemplary embodiment illustrates a wireless charging system comprising multiple transmitting coils, denoted as transmitting coil 1, transmitting coil 2, and transmitting coil 3. Transmitting coil 1 can be implemented as the aforementioned first transmitting coil. A controller can determine, based on the positions of each transmitting coil, whether there are other transmitting coils on the path between the center of the charging range of transmitting coil 1 and the wireless charging receiving circuit. Assume that 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.

[0196] The controller controls the alignment module to synchronously move transmitting coil 2 and transmitting coil 1. For example, the controller can move transmitting coil 2 away from the wireless charging receiver circuit along the row direction at a second speed. The controller can move transmitting coil 1 towards the wireless charging receiver circuit along the row direction at a first speed. The second speed is greater than the first speed. Synchronously driving transmitting coil 2 and transmitting coil 1 reduces the alignment time between transmitting coil 1 and the wireless charging receiver circuit.

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

[0198] like Figure 8CAs shown, black dot M1 represents the center position of the charging range of transmitting coil 1, and black dot M2 represents the center position of the receiving coil of the electronic device. Straight line L1 is the line between the center position of the charging range of transmitting coil 1 and the center position of the wireless charging receiving circuit. The shaded area represents the range of movement of the charging range of transmitting coil 1. For example, the charging range of transmitting coil 2 overlaps with this range of movement, and the controller can determine that the position of transmitting coil 2 is located on the path between the center position of the charging range of transmitting coil 1 and the wireless charging receiving circuit.

[0199] Then, the controller can control the alignment module to move the transmitting coil 2 away from the wireless charging receiver circuit along the row direction at a second speed. The controller can also control the transmitting coil 1 to move towards the wireless charging receiver circuit along the row direction at a first speed. The second speed is greater than the first speed.

[0200] Figure 9A An exploded view of a wireless charging system is shown according to an exemplary embodiment. Figure 9A As shown, 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 liner 904, an alignment module 905, and an inverter and control PCB 906.

[0201] The cavity formed by the upper housing 901A and the lower housing 901B can accommodate the detection PCB 902, at least one transmitting coil 903, a liner 904, an alignment module, and an inverter and control PCB 906. Exemplarily, the detection PCB 902 can be equipped with a detection coil array of the wireless charging device in any of the above embodiments, and a detection circuit coupled to each detection coil array. The liner 904 is disposed 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 for alignment with the wireless charging receiving circuit. The inverter and control PCB 906 can be equipped with an inverter circuit and a controller as described 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 embodiments of this application do not specifically limit the number of grooves 907; the number of grooves 907 can be equal to the number of transmitting coils. For example, when the wireless charging system includes three transmitting coils, the number of grooves 907 is also three.

[0203] Optionally, the outer surface of the upper housing 901A of the wireless charging system does not have the groove 907, that is, it is a flat plane, which makes the appearance more beautiful and the manufacturing process simple and easy to produce.

[0204] For example, such as Figure 9A As shown, the wireless charging system may include three transmitting coils 903. An alignment module can be used to drive the movement of each transmitting coil. Figure 9B A schematic diagram illustrating the connection relationship of the detection PCB902, three transmitting coils 903, alignment module, inverter and control PCB906 is shown according to an exemplary embodiment.

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

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

[0207] The inverter and control circuit PCB906 includes 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 the corresponding motor module through motor control traces.

[0208] The inverter and control circuit PCB906 also includes a first inverter circuit 9062A, a second inverter circuit 9062B, and a third inverter circuit 9062C. The first inverter circuit 9062A, the second inverter circuit 9062B, and the third inverter circuit 9062C 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, enabling control of the transmitting coil for wireless charging.

[0209] The inverter and control circuit PCB906 is also equipped with a controller from the control module 20 in any of the aforementioned embodiments. The controller can be coupled to each motor drive circuit to control each motor drive circuit. The controller can be coupled to each inverter circuit to control each inverter circuit. The controller can be coupled to the detection circuit corresponding to any detection coil array on the detection PCB902, and can control each detection circuit to perform detection and acquire information provided by each detection circuit, such as the voltage amplitude of the signal at the first frequency and the voltage amplitude of the signal at the second frequency.

[0210] The exploded view of the wireless charging system provided in this application is only for illustrating the structural form of the wireless charging system and is not intended to limit the specific structure of the wireless charging system.

[0211] For ease of understanding, based on Figure 5C The structure of the detection coil array of the wireless charging device is shown. Figure 10 A functional schematic diagram of a wireless charging device is shown according to an exemplary embodiment. The wireless charging system provided in this application embodiment may include a wireless charging receiver 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 further 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 the preset protection method based on parameters such as voltage, current, and temperature collected by the sampling protection circuit.

[0213] Wireless charging functionality typically relies on a transmitting coil, foreign object detection circuit, in-band communication circuit, and inverter circuit within the wireless charging system. For example, the foreign object detection circuit can detect foreign objects under the control of a controller, which can also determine the corresponding restricted area based on the location of the foreign object. 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 receiving circuit. The transmitting coil is coupled to the inverter circuit, allowing the controller to adjust the charging power of the transmitting coil for wireless charging 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 its position is located in the overlapping area between multiple charging planes.

[0215] The function of defining a restricted area can be implemented based on the controller and each wireless charging device. The controller determines the restricted area through any one of the wireless charging devices. Optionally, the wireless charging system can also have NFC circuit location detection functionality, which can also be implemented based on the controller and each wireless charging device.

[0216] The function of determining rechargeable areas can be implemented based on the controller. The controller can define the portion of multiple charging planes, excluding restricted areas, as rechargeable areas.

[0217] The transmitting coil alignment function can be implemented based on a controller and an alignment module. The controller can control the alignment module to drive the transmitting coil, aligning the transmitting coil with the wireless charging receiver circuit.

[0218] Figure 11 A flowchart illustrating the operation of a wireless charging system is shown according to an exemplary embodiment. The operation of the wireless charging system may include the following steps:

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

[0220] The wireless charging system can control each transmitting coil to perform foreign object detection. The system can control each transmitting coil to perform foreign object detection using existing methods. Based on the transmitting coil that detects a foreign object, the system can define the corresponding charging area as the area where the foreign object is present. Because the system can control each transmitting coil to perform wireless charging, it can identify the status of active, inactive, and faulty transmitting coils. Active transmitting coils refer to those currently performing wireless charging, while inactive transmitting coils refer to those that are not faulty and are not performing wireless charging.

[0221] Step S1002: Determine whether there are foreign objects on the surface of the wireless charging system or whether there is a working transmitting coil in the device. If yes, proceed to step S1003; otherwise, proceed to step S1004.

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

[0223] Step S1003: Scan and detect the wireless charging receiving circuit of each charging plane in the first region. The first region is the area on the surface of the wireless charging system excluding the area where there are foreign objects, the charging area corresponding to the working transmitting coil, and the charging range corresponding to the faulty transmitting coil.

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

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

[0226] The wireless charging system can traverse and detect wireless charging receiving circuits on each charging plane on the surface of the wireless charging system. For example, the wireless charging system can traverse and control each charging plane to detect wireless charging receiving circuits. 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 re-executed.

[0227] Step S1005: Calculate the location of the wireless charging receiver circuit.

[0228] If a wireless charging device on any charging plane detects the wireless charging receiver circuit, the wireless charging system can calculate the location of the wireless charging receiver circuit. For example, if a wireless charging device on the first charging plane detects the wireless charging receiver circuit, the wireless charging system can detect the location of the wireless charging receiver circuit using the wireless charging device on the first charging plane.

[0229] Step S1006: Determine whether the location of the wireless charging receiver circuit is within the overlapping area of ​​multiple charging planes. If yes, proceed to step S1007; otherwise, proceed to step S1008.

[0230] The wireless charging system can correct its position if the location of the wireless charging receiver circuit is determined to be within the overlapping area of ​​multiple charging planes, thereby improving wireless charging efficiency. The next step is S1007. If the location of the wireless charging receiver circuit is not within the overlapping area of ​​any two charging planes, no position correction is required, and the next step is S1008.

[0231] Step S1007: Correct the position of the wireless charging receiver circuit.

[0232] Assuming the wireless charging receiver circuit lies within the overlapping area of ​​the first and second charging planes, the wireless charging system can detect this receiver circuit using the wireless charging device belonging to the second charging plane and calculate its position. The system can then use the average of the positions detected by the wireless charging device on the first and second charging planes as the corrected position of the wireless charging receiver circuit.

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

[0234] The wireless charging system can align a first transmitting coil with the wireless charging receiving circuit, wherein the first transmitting coil is located near the center of the charging range close to the wireless charging receiving circuit. The wireless charging system can determine the alignment path between the first transmitting coil and the wireless charging receiving circuit, and determine whether there are other transmitting coils along this path. If other transmitting coils are present along the path, the system determines their movement paths, causing them to avoid this path.

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

[0236] The wireless charging system can control the movement paths of each transmitting coil in the system, except for the second transmitting coil, to avoid the first transmitting coil and to avoid the second transmitting coil. The second transmitting coil is the transmitting coil closest to the first transmitting coil on its movement path. The wireless charging system can move the first and second transmitting coils synchronously. In one possible implementation, 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 (e.g., a row direction) toward the corrected position of 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 corrected position of the wireless charging receiving circuit, wherein the second speed is greater than the first speed.

[0237] Step S1010: Wireless charging is performed on the wireless charging receiver 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 of the transmitting coil. The wireless charging process for each transmitting coil may include foreign object detection, in-band communication, and charging control. Each stage of the wireless charging process is independent and can be executed in parallel. Optionally, after the transmitting coil completes the wireless charging process, it can move to its initial position under the drive of a positioning mechanism. The initial positions of each transmitting coil are pre-configured.

[0239] Optionally, after step S1010, the wireless charging system can also determine whether there is a fault in the system. If a fault exists, the system is protected by reducing the rated power or shutting down the device. If no fault exists, the wireless charging system can repeat the operations in the above steps.

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

Claims

1. A wireless charging device, a surface of the wireless charging device serving as a charging plane for placement of at least one electronic device, the at least one electronic device including one or more of near field communication circuitry or wireless charging receiving circuitry, characterized in that, The wireless charging device comprises a detection coil array and a transmitting coil, the detection coil array comprises a plurality of detection areas, the plurality of detection areas correspond to a plurality of charging areas of the charging plane respectively, and the plurality of detection areas are used for detecting signal types of signals emitted by the at least one electronic device placed on the charging plane respectively, wherein The wireless charging device is used for adjusting power for wireless charging of the at least one electronic device in response to the signal types detected by at least one of the detection areas. The plurality of detection areas are used for detecting signal strengths of near field communication type signals emitted by the at least one electronic device respectively, and the wireless charging device is used for: controlling power of the transmitting coil in a defined area to be less than or equal to a preset limit value, the defined area comprises a charging area corresponding to a part of the detection areas determined from the plurality of detection areas, and the part of the detection areas is determined from the plurality of detection areas according to the signal strengths of the near field communication type signals detected by at least one of the detection areas.

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

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

4. The wireless charging device of any one of claims 1-2, wherein, The detection coil array is used for detecting at least one of near field communication type signals and wireless charging type signals, wherein: the near field communication type signals comprise one or more of resonance signals generated by a receiving coil in a near field communication circuit and communication signals generated by the near field communication circuit; and the wireless charging type signals comprise one or more of resonance signals generated by a receiving coil in a wireless charging receiving circuit and communication signals generated by the wireless charging receiving circuit.

5. The wireless charging device of any one of claims 1-2, wherein, The wireless charging device comprises an alignment mechanism used for moving the transmitting coil, the plurality of detection areas are used for detecting signal strengths of wireless charging type signals emitted by the at least one electronic device respectively, and the alignment mechanism is used for: moving the transmitting coil to a target area, the target area comprises a part of the plurality of detection areas, and the part of the detection areas is determined according to the signal strengths of the wireless charging type signals detected by at least one of the detection areas.

6. The wireless charging device of claim 5, wherein, The detection coil array comprises: a plurality of first detection coils arranged on a printed circuit board, the plurality of first detection coils are arranged along a first direction, and adjacent two of the plurality of first detection coils partially overlap; a plurality of second detection coils arranged on the printed circuit board, the plurality of second detection coils are arranged along a second direction, adjacent two of the plurality of second detection coils partially overlap, and the second direction is not parallel to the first direction. The printed circuit board is parallel to the charging plane, and projections of the first detection coils on the charging plane at least partially overlap projections of the second detection coils on the charging plane. An overlapping part of a projection of one of the first detection coils on the charging plane and a projection of one of the second detection coils on the charging plane forms one of the detection areas.

7. The wireless charging device of claim 6, wherein, The detection area is configured to determine a type of a detected signal according to a wireless charging type signal or a near field communication type signal detected by at least one of the first detection coils or the second detection coils.

8. The wireless charging device of claim 7, wherein, The detection coil array is configured to: determine, according to signal strengths of the wireless charging type signals detected by the first detection coils and signal strengths of the wireless charging type signals detected by the second detection coils, whether a charging area corresponding to one of the detection areas is placed with a wireless charging receiving circuit.

9. The wireless charging device of claim 8, wherein, The target area includes charging areas corresponding to one or more of the detection areas determined according to 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 according to a comparison result of signal strengths of the wireless charging type signals detected by the first detection coils and a first threshold value, and the one or more adjacent second detection coils are determined according to a comparison result of signal strengths of the wireless charging type signals detected by the second detection coils and the first threshold value.

10. The wireless charging device of claim 7, wherein, The detection coil array is configured to: determine, according to signal strengths of the near field communication type signals detected by the first detection coils and signal strengths of the near field communication type signals detected by the second detection coils, whether a charging area corresponding to one or more of the detection areas is placed with a near field communication circuit.

11. The wireless charging device of claim 10, wherein, The target area includes charging areas corresponding to one or more of the detection areas determined according to 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 according to a comparison result of signal strengths of the near field communication type signals detected by the first detection coils and a second threshold value, and the one or more adjacent second detection coils are determined according to a comparison result of signal strengths of the near field communication type signals detected by the second detection coils and the second threshold value.

12. A wireless charging system, comprising: The wireless charging system includes a plurality of the wireless charging devices according to any one of claims 1-11, and a surface of the wireless charging system serves as a charging plane for placing at least one electronic device. The charging plane of the wireless charging system is formed by combining the charging planes of the plurality of wireless charging devices.

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