WO2024050706A1

WO2024050706A1 - Wireless charging device and wireless charging system

Info

Publication number: WO2024050706A1
Application number: PCT/CN2022/117398
Authority: WO
Inventors: 胡耀威; 吴宝善; 周小兵
Original assignee: 华为数字能源技术有限公司
Priority date: 2022-09-06
Filing date: 2022-09-06
Publication date: 2024-03-14

Abstract

The present application provides a wireless charging device and a wireless charging system, capable of avoiding damage of near-field communication (NFC) circuits. A surface of the wireless charging device serves as a charging surface and allows for placement of at least one electronic device; the at least one electronic device comprises one or two of an NFC circuit or a wireless charging receiving circuit; the wireless charging device comprises a detection coil array; the detection coil array comprises a plurality of detection areas; the plurality of detection areas respectively correspond to a plurality of charging areas of the charging surface; each detection area has the capability of detecting the signal type of a signal sent by the electronic device, so as to detect whether the electronic device on the charging surface comprises an NFC circuit or a wireless charging receiving circuit. Depending on whether the electronic device on the charging surface comprises an NFC circuit or a wireless charging receiving circuit, the wireless charging device can adjust the power of wireless charging for the electronic device, such that damage of the NFC circuit can be avoided.

Description

A kind of wireless charging equipment and wireless charging system

Technical field

The present application relates to the field of wireless charging technology, and in particular, to a wireless charging device and a wireless charging system.

Background technique

Wireless charging technology (WCT) uses conductive media such as electric fields, magnetic fields, microwaves or lasers to achieve wireless transmission of electrical energy. Due to its advantages of no wire restrictions and no plugging and unplugging, it is currently used more and more in electronic devices. The more extensive it is. Currently, more and more electronic devices use wireless charging equipment to charge them wirelessly. For example, electronic devices can be mobile phones, wearable devices, etc. The wireless charging device includes a transmitting coil, and the electronic device includes a receiving coil.

Currently, wireless charging technology transmits energy through magnetic field coupling between the transmitting coil and the receiving coil, which requires the transmitting coil and the receiving coil to be located within a certain spatial distance. If the user places a device containing a near field communication (NFC) circuit within this spatial distance, the NFC circuit will be damaged when the transmitting coil and receiving coil in the wireless charging device are wirelessly charged.

Contents of the invention

This application provides a wireless charging device and a wireless charging system that can avoid NFC circuit damage.

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

In the embodiment of the present application, the detection area may have the ability to detect the signal type of the signal emitted by the electronic device, thereby detecting whether the electronic device on the charging plane includes an NFC circuit or a wireless charging receiving circuit. It is convenient for the wireless charging device to adjust the power of wireless charging of the electronic device according to the condition of the electronic device on the charging plane, including the near field communication circuit or the wireless charging receiving circuit, so as to avoid damage to the NFC circuit.

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

In this embodiment of the present application, the signal types detected by at least one of the detection areas include wireless charging type signals and near field communication type signals, which can reflect that the electronic devices placed on the charging plane include wireless charging receiving circuits and NFC circuits. The wireless charging device uses a power less than or equal to the preset limit value to wirelessly charge the wireless charging receiving circuit, that is, low-power wireless charging, which can prevent damage to the NFC circuit.

In a possible design, the wireless charging device may respond to at least one signal type detected by the detection area including a wireless charging type signal and not a near field communication type signal, and the wireless charging device adjusts to the at least one The power of an electronic device for wireless charging is greater than the preset limit value.

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

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

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

In a possible design, the wireless charging device includes a transmitting coil and an alignment mechanism, the alignment mechanism is used to move the transmitting coil, and the plurality of detection areas are respectively used to detect the at least one electronic device emitting The signal strength of the wireless charging type signal, the alignment mechanism can be used to move the transmitting coil to a target area, the target area includes a partial area among the plurality of detection areas, the partial area is based on at least one The signal strength of the wireless charging type signal detected in the detection area is determined.

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

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

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

In a possible design, the detection coil array may be provided on a plurality of first detection coils on a printed circuit board. The plurality of first detection coils are arranged along a first direction. Among the plurality of first detection coils, Two adjacent first detection coils partially overlap; a plurality of second detection coils are provided on the printed circuit board, the plurality of second detection coils are arranged along the second direction, and the plurality of second detection coils are Two adjacent second detection coils partially overlap, and the second direction is not parallel to the first direction. Wherein, the printed circuit board is parallel to the charging plane, and the projection of the plurality of first detection coils on the charging plane at least partially overlaps with the projection of the plurality of second detection coils on the charging plane, The overlapping portion of a projection of the first detection coil on the charging plane and a projection of the second detection coil on the charging plane forms a detection area.

In this embodiment of the present application, the detection coil array may include a plurality of first detection coils and a plurality of second detection coils. The overlapping portion of projections of a first detection coil and a second detection coil on the charging plane may form a detection area. By using 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, the signal type of the detection signal in a detection area can be realized.

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

In a possible design, the detection coil array may be used to determine the signal strength of the wireless charging type signals detected by the plurality of first detection coils and the signal strength of the wireless charging type signals detected by the plurality of second detection coils. Strength, determine the charging area corresponding to a detection area where a wireless charging receiving circuit is placed.

In a possible design, the target area includes charging corresponding to one or more detection areas determined based on one or more adjacent first detection coils and one or more adjacent second detection coils. area, wherein: the one or more adjacent first detection coils are determined according to a comparison result between 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 first detection coils are The adjacent second detection coils are determined based on a comparison result between the signal strength of the wireless charging type signals detected by the plurality of second detection coils and the first threshold.

In this embodiment of the present application, the wireless charging device may select one or more adjacent first detection coils based on a comparison result between the signal strength of the wireless charging type signals detected by the plurality of first detection coils and the first threshold. One or more adjacent second detection coils are selected according to a comparison result between the signal strength of the wireless charging type signal detected by the plurality of second detection coils and the first threshold. One or more detection areas are selected according to the selected one or more adjacent first detection coils and the selected one or more adjacent second detection coils, and the selected one or more detection areas The charging area corresponding to the area is used as the target area. According to the signal strength of the wireless charging type signal detected by the first detection coil and the second detection coil of the wireless charging device, the detection area formed by the selected first detection coil and the selected second detection coil can be used as the selected one or Multiple detection areas. Using the charging area corresponding to the selected detection area as the target area, the function of determining the position of the wireless charging receiving circuit can be realized. It facilitates the alignment of the transmitting coil and the wireless charging receiving circuit and improves the wireless charging efficiency.

In a possible design, the detection coil array may be configured according to the signal strength of the near field communication type signals detected by the plurality of first detection coils and the signal strength of the near field communication type signals detected by the plurality of second detection coils. The intensity determines whether a near field communication circuit is placed in the charging area corresponding to one or more of the detection areas.

In a possible design, the defined area includes charging corresponding to one or more detection areas determined based on one or more adjacent first detection coils and one or more adjacent second detection coils. area, wherein: the one or more adjacent first detection coils are determined according to a comparison result between the signal strength of the near field communication type signal detected by the plurality of first detection coils and the second threshold, and the one or more adjacent first detection coils The adjacent second detection coils are determined according to a comparison result between the signal strength of the near field communication type signals detected by the plurality of second detection coils and the second threshold.

In this embodiment of the present application, the wireless charging device may select one or more adjacent first detection coils based on a comparison between the signal strength of the near field communication type signals detected by the plurality of first detection coils and the second threshold. One or more adjacent second detection coils are selected according to a comparison result between the signal strength of the near field communication type signals detected by the plurality of second detection coils and the second threshold. One or more detection areas are selected according to the selected one or more adjacent first detection coils and the selected one or more adjacent second detection coils, and the selected one or more detection areas The charging area corresponding to the area is used as the limited area. According to the signal strength of the near field communication type signal detected by the first detection coil and the second detection coil of the wireless charging device, the detection area formed by the selected first detection coil and the selected second detection coil can be used as the selected one. or multiple detection areas. Using the charging area corresponding to the selected detection area as a limited area, the function of determining the position of the NFC circuit can be realized. It is convenient to adjust the wireless charging power in the limited area to be less than the preset limit value to avoid damage to the NFC circuit.

In one possible design, the wireless charging device can decode the signals respectively received by the first detection coil and the second detection coil in the detection coil array. The decoding result includes the NFC start communication code, which can determine that the detection coil array has received The signal type is NFC type signal. Alternatively, the wireless charging device may determine that the signal type received by the detection coil array is an NFC type signal based on the fact that the signals received by the first detection coil and the second detection coil in the detection coil array comply with the frame format specified in the NFC communication protocol. Or the wireless charging device can detect the frequency contained in the signals received by the first detection coil and the second detection coil respectively in the detection coil array. If it is detected that the received signal contains the signal of the first frequency, it can be determined that the detection coil array receives the signal. The received signal type is NFC type signal. The first frequency is the resonant frequency of the receiving coil in the NFC circuit.

In a possible design, the wireless charging device can respectively receive signals from the first detection coil and the second detection coil in the detection coil array, including the value of the head part specified in the wireless charging protocol, and can determine the value of the head part received by the detection coil array. The signal type is a wireless charging type signal. Or the wireless charging device can detect the frequency contained in the signals received by the first detection coil and the second detection coil respectively in the detection coil array. If it is detected that the received signal contains the signal of the second frequency, it can be determined that the detection coil array receives the signal. The signal type received is a wireless charging type signal. The second frequency is the resonant frequency of the receiving coil in the wireless charging receiving circuit.

In a second aspect, embodiments of the present application also provide a wireless charging system, which may include multiple wireless charging devices. Any wireless charging device may be any wireless charging device provided in the first aspect. The 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 a combination of charging planes of multiple wireless charging devices.

The charging plane of each wireless charging device is arranged on the surface of the wireless charging system; the wireless charging system includes a plurality of transmitting coils and an alignment module; the multiple transmitting coils and the multiple wireless charging devices are one by one correspond. The wireless charging system responds to at least one wireless charging device detecting the wireless charging receiving circuit, and the alignment module moves the first transmitting coil to align with the wireless charging receiving circuit, wherein none of the plurality of first transmitting coils is in Among the transmitting coils in the working state, among the distances between the positions of each transmitting coil and the position of the wireless charging receiving circuit, the distance between the position of the first transmitting coil and the position of the wireless charging receiving circuit is the smallest. .

In this embodiment of the present application, the alignment module may include an alignment mechanism in each wireless charging device. The multiple transmitting coils included in the wireless charging system may be transmitting coils in multiple wireless charging devices. To improve the charging flexibility of the wireless charging system, the alignment module can uniformly schedule the transmitting coil to wirelessly charge the wireless charging receiving circuit placed on the surface of the system. Wherein, the wireless charging system can respond to a wireless charging device detecting the wireless charging receiving circuit, and move the first transmitting coil closest to the position of the wireless charging device to align with the wireless charging receiving circuit, which can reduce the alignment. Bit duration.

In a possible design, the alignment module may respond to at least one second transmitting coil being located on a path between the center position of the first transmitting coil and the position of the wireless charging receiving circuit. The module moves the first transmitting coil and the target second transmitting coil in the same direction, wherein the moving speed of the first transmitting coil in the same direction is smaller than the movement of the target second transmitting coil in the same direction. speed, the target second transmitting coil is the second transmitting coil closest to the first transmitting coil among the at least one second transmitting coil.

In the embodiment of the present application, when there are other transmitting coils on the moving path of the first transmitting coil, the alignment module can move other transmitting coils on the path. For the target second transmitting coil that is 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 with reference to different speeds, where the target The speed of the second transmitting coil is greater than the speed of the first transmitting coil. The alignment module is implemented to simultaneously move 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.

Description of the drawings

Figure 1A shows a schematic diagram of a wireless charging system;

Figure 1B shows a schematic structural diagram of a wireless charging system;

Figure 2 shows a schematic structural diagram of a wireless charging device;

Figure 3A shows a schematic diagram of the position between two detection areas;

Figure 3B shows a schematic diagram of the position between two detection areas;

Figure 3C shows a schematic diagram of the position between two detection areas;

Figure 3D shows a schematic diagram of the position between two detection areas;

Figure 4 shows a schematic diagram of the positions between multiple detection areas;

Figure 5A shows a schematic structural diagram of a wireless charging device;

Figure 5B shows a specific structural schematic diagram of a wireless charging device;

Figure 5C shows a specific structural schematic diagram of a wireless charging device;

Figure 5D shows a schematic coordinate system diagram of multiple detection areas of a wireless charging device;

Figure 5E shows a schematic diagram of a defined area;

Figure 5F shows a schematic diagram of a defined area;

Figure 6A shows a schematic structural diagram of a wireless charging device;

Figure 6B shows a specific structural schematic diagram of a wireless charging device;

Figure 6C shows a specific structural schematic diagram of a wireless charging device;

Figure 7A shows a schematic diagram of the positional relationship of multiple charging planes in a wireless charging system;

Figure 7B shows a schematic diagram of the positional relationship of multiple charging planes in a wireless charging system;

Figure 7C shows a schematic diagram of the positional relationship of multiple charging planes in a wireless charging system;

Figure 7D shows a schematic diagram of the positional relationship of multiple charging planes in a wireless charging system;

Figure 7E shows a schematic diagram of the positional relationship of multiple charging planes in a wireless charging system;

Figure 8A shows a schematic diagram of the positional relationship of multiple charging planes in a wireless charging system;

Figure 8B shows a schematic diagram of the positional relationship between an electronic device and multiple charging planes in a wireless charging system;

Figure 8C shows a schematic diagram of the movement range of a transmitting coil;

Figure 9A shows an exploded view of the structure of a wireless charging system;

Figure 9B shows a schematic structural diagram of a wireless charging system;

Figure 10 shows a functional schematic diagram of a wireless charging system;

Figure 11 shows a working process flow chart of a wireless charging system.

Detailed ways

Words such as "first" and "second" in the following description are for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of indicated technical features. Thus, features defined by "first," "second," etc. may explicitly or implicitly include one or more of these features. In the description of the embodiments of this application, unless otherwise specified, "plurality" means two or more.

In addition, in the embodiments of the present application, directional terms such as "upper" and "lower" may include, but are not limited to, defined relative to the schematically placed directions of the components in the drawings. It should be understood that these directional terms may be relative. Concepts, which are used for relative description and clarification, may change accordingly depending on the orientation in which components are placed in the drawings.

In the embodiments of this application, unless otherwise clearly stated and limited, the term "connection" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral body; it can be a direct connection. , can also be connected indirectly through intermediaries. Furthermore, the term "coupling" may refer to a means of electrical connection to achieve signal transmission. "Coupling" can be a direct electrical connection or an indirect electrical connection through an intermediary.

In the embodiments of this application, a circuit that supports the NFC protocol or technology is called an NFC circuit. Usually, a receiving coil is provided in the NFC circuit for NFC communication. A device including an NFC circuit is called an NFC device. The embodiments of this application do not specifically limit the form of the NFC device. At present, the more common form is card type, such as ID card, bank card, etc.

In the embodiments of this application, a circuit that supports wireless charging protocols or technologies is called a wireless charging receiving circuit. A device including a wireless charging receiving circuit is called a wireless charging receiving device. Usually the wireless charging receiving circuit is equipped with receiving coupons for wireless charging. A wireless charging receiving circuit generally refers to a circuit that can charge the battery in the device or provide power to the load in the device through wireless charging. The embodiments of the present application do not specifically limit the type of wireless charging receiving device. For example, the wireless charging receiving device can be a mobile phone, a tablet, a computer with a wireless transceiver function, a smart wearable product (for example, a smart watch, a smart Bracelets, headsets, etc.), virtual reality (VR) terminal devices, augmented reality (AR) terminal devices, etc. have wireless devices.

The embodiment of the present application relates to a wireless charging system, which is used to wirelessly charge a wireless charging receiving device. The wireless charging system can be connected to a power supply. For example, the wireless charging system has a Type C interface, and an adapter is connected through the Type C interface. One end of the adapter is connected to the mains power, such as AC 220V. The wireless charging system includes a transmitting coil, and the electronic device includes a receiving coil. The power supply powers the transmitting coil in the wireless charging system. When an 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.

Refer to Figure 1A, which is a schematic diagram of a wireless charging system provided by an embodiment of the present application. In FIG. 1A , the wireless charging system 1000 is shown as a flat surface, that is, the wireless charging system can be placed flat on the desktop when working. In addition, the wireless charging system 1000 provided in the embodiment of the present application can also be three-dimensional, for example, it can be placed on the desktop in other postures through a stand. In Figure 1A, the appearance of the wireless charging system is oval as an example. The embodiment of the present application does not limit the appearance of the wireless charging system, and it can be circular, rectangular, etc. In addition, the wireless charging system can also be in a three-dimensional shape.

As wireless charging systems are widely used in people's daily lives, users often place electronic devices including NFC devices and receiving coils on the surface of the wireless charging system. When the transmitting coil in the wireless charging system wirelessly charges the receiving coil of the electronic device, the electromagnetic waves transmitted between the transmitting coil and the receiving coil will cause damage to the NFC circuit in the NFC device, causing the NFC device to malfunction.

In view of this, this application provides a wireless charging system and wireless charging equipment with the function of protecting NFC devices to avoid damaging the NFC circuit. The wireless charging system may include at least one wireless charging device, and the wireless charging device may have functions or capabilities to avoid damaging the NFC circuit.

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

The wireless charging device provided by the embodiment of the present application will be introduced below with reference to the accompanying drawings. Figure 2 shows a schematic structural diagram of a wireless charging device provided by an embodiment of the present application. The wireless charging device 1000A may include a detection coil array 10, a control module 20, and a transmitting coil 30. The detection coil array 10 may be used to detect the 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, in order to improve the degree of freedom of wireless charging, the wireless charging device further includes an alignment mechanism 40 , which is 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. Generally, one transmitting coil corresponds to two motors, which can drive the transmitting coil to move in the first direction and the second direction respectively, where the first direction and the second direction are not parallel. . The embodiments of this application do not limit this too much. Optionally, the alignment mechanism 40 may include guide rails. The control module 20 may be connected with the detection coil array 10 , the transmitting coil 30 , and the alignment mechanism 40 . The control module 20 can control the detection coil array 10 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 to control the transmitting coil 30 for 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 to drive the alignment mechanism 40 to move the transmitting coil 30 .

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

Example 1. Please refer to Figure 3A. On the charging plane, there is an interval between two adjacent detection areas. At this time, there are gaps between each charging area. Example 2. Please refer to Figure 3B. On the charging plane, two adjacent detection areas are continuous, and there may be no gap between the two detection areas. Example 3. Please refer to Figure 3C. On the charging plane, two adjacent detection areas can partially overlap. Charging areas corresponding to two adjacent detection areas may not overlap. Example 4. Please refer to Figure 3D. On the charging plane, two adjacent detection areas may partially overlap, and the charging areas corresponding to the two adjacent detection areas may overlap. The black shaded part shown in Figure 3D is Overlapping charging areas.

In one possible scenario, multiple detection areas can be arranged in a matrix. Among the multiple detection areas, one detection area may have detection areas adjacent in the first direction and detection areas adjacent in the second direction. Wherein, the first direction and the second direction are not parallel. Optionally, the first direction may be perpendicular to the second direction. For ease of explanation, the first direction and the second direction are perpendicular to each other 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 areas in the row direction may be any of the above examples 1-3. The positional relationship between two adjacent detection areas in the column direction may be any of the above examples 1-3.

The detection coil array 10 includes a plurality of detection areas for detecting the signal type of the signal emitted by at least one electronic device placed on the charging plane. Signal types may include but are not limited to signals sent by NFC circuits and signals sent by wireless charging receiving circuits. For ease of introduction, in this application, the signal emitted by the NFC circuit is abbreviated as an NFC type signal, and the signal emitted by the wireless charging receiving circuit is abbreviated as a wireless charging type signal. The NFC type signal may include any one of an NFC communication signal and an NFC resonance signal. Among them, the NFC communication signal is a communication signal sent by the NFC circuit based on the NFC communication protocol, that is, the communication signal generated by the NFC circuit. The NFC resonance signal may be the resonance signal generated by the receiving coil in the NFC circuit, that is, the resonance signal generated by the NFC circuit. The wireless charging type signal may include any one of a wireless charging communication signal and a wireless charging resonance signal. The wireless charging communication signal may be a communication signal sent by the wireless charging receiving circuit based on the wireless charging protocol, that is, a communication signal generated by the wireless charging receiving circuit. The wireless charging resonance signal may be the resonance signal generated by the receiving coil in the wireless charging receiving circuit, that is, the resonance signal generated by the wireless charging receiving circuit.

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

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

The control module 20 may determine whether the signal received by the detection coil array 10 complies with the NFC communication protocol. In one possible design, the control module 20 decodes the signal received by the detection coil array 10 and includes an NFC start of communication code, which can determine that the signal type received by the detection coil array 10 is an NFC type signal. The control module 20 can determine that the signal type received by the detection coil array 10 is an NFC type signal based on the fact that the signal received by the detection coil array 10 complies with the frame format specified in the NFC communication protocol.

Generally, wireless charging between a wireless charging device and a wireless charging receiving device includes a ping phase, a configuration phase, a negotiation phase, and an energy transfer phase. Among them, in the ping phase, configuration phase, and negotiation phase, the wireless charging receiving device can send a signal carrying wireless charging parameters. The signal carrying wireless charging parameters generally includes a header part and a parameter part. The value in the header part can reflect the specific type of parameters carried by the signal, and the parameters in the parameter part are parameters. The value of the header part can be the value of the header part specified in any wireless charging protocol. The control module 20 may determine that the signal type received by the detection coil array 10 is a wireless charging type signal based on the fact that the signal received by the detection coil array 10 includes the value of the head part specified in the wireless charging protocol.

In another possible detection method, the control module 20 can use information such as frequency, intensity, or power of the signal received by the detection coil array 10 to determine the signal type of the received signal. Determining the type of signal received by the detection coil array 10 using the frequency of the signal received by the detection coil array 10 will be described in detail below as an example.

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 will self-resonate and send out a resonance signal. The detection coil array 10 can receive resonance signals generated by one or more electronic devices placed on a charging plane.

The pulse signals sent by the detection coil array 10 can be received by electronic devices placed on the charging plane. If the electronic device on the charging plane includes an NFC circuit, and after receiving the pulse signal, the NFC circuit self-resonates under the action of the pulse signal and generates a resonance signal with a frequency of the first frequency, the detection coil array 10 can be coupled to The NFC circuit generates a resonant signal of a first frequency. The first frequency represents the resonant frequency of the receiving coil of the NFC circuit. Typically, the self-resonant frequency range of NFC circuits includes frequencies around 13.56MHz. For example, the self-resonant frequency range of the NFC circuit can be 13.56MHz-7KHz~13.56MHz+7KHz. Optionally, the first frequency may be 13.56MHz.

If the electronic device on the charging plane includes a receiving coil in the wireless charging receiving device, after receiving the pulse signal, the receiving coil in the wireless charging receiving device will self-resonate under the action of the pulse signal and generate a frequency of the second frequency The resonance signal of the detection coil array 10 may be coupled to the resonance signal of the second frequency generated by the wireless charging receiving circuit. The second frequency represents the resonant frequency of the receiving coil in the wireless charging receiving circuit. Usually, the self-resonant frequency range of the receiving coil in the wireless charging receiving device is 300KHz ~ 1.5MHz. Optionally, the second frequency can be any frequency from 300kHz to 1.5MHz.

For ease of introduction, the resonant signal coupled to or received by the detection coil array 10 is referred to as the first resonant signal. The control module 20 is coupled to the detection coil array 10 . The control module 20 may have the ability to determine whether the first resonant signal contains a signal of the first frequency, and whether it contains a signal of the second frequency. When the first resonance signal includes a signal of the first frequency, the signal type that may characterize the first resonance signal includes an NFC type signal. When the first resonance signal includes a signal of the second frequency, the signal type that may characterize the first resonance signal includes a wireless charging type signal.

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

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

In one embodiment, the signal type emitted by at least one electronic device placed on the charging surface may include NFC type signals and not include wireless charging type signals. The wireless charging device may 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 including only NFC type signals. In the embodiment of the present application, the charging area corresponding to a detection area may be all or part of the range covered by the projection of the detection area on the charging plane.

Illustratively, based on the wireless charging device provided in any of the above examples, the control module 20 may not control the transmitting coil 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. Wirelessly charge electronic devices in the charging area corresponding to the at least one detection area.

In some possible scenarios, the control module 20 may respond to the first resonance signal detected by at least one detection area containing the signal of the first frequency and not containing the signal of the second frequency, and not control the transmitting coil 30 to respond to the signal of the second frequency. The electronic devices in the charging area corresponding to at least one detection area are wirelessly charged, or the transmitting coil 30 is not controlled to wirelessly charge the electronic devices on the charging plane.

In one embodiment, the signal type emitted by at least one electronic device placed on the charging plane may include a wireless charging type signal and not 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 may respond to the signal type detected by at least one detection area including only wireless charging type signals, and the wireless charging device 1000A adjusts the power of the at least one electronic device on the charging plane for wireless charging to be greater than the preset limit value. For example, the wireless charging device 1000A can exchange charging parameters with the wireless charging receiving circuit based on wireless charging technology, and use the charging parameters provided by the wireless charging receiving circuit to wirelessly charge the wireless charging receiving circuit. Generally, the wireless charging device 1000A uses the charging parameters provided by the wireless charging receiving circuit, and the wireless charging power of the wireless charging receiving circuit is greater than the preset limit value.

In one possible design, multiple detection areas in the detection coil array 10 can be used to detect the signal strength of wireless charging type signals emitted by electronic devices on the charging plane. In the embodiment of the present application, the signal strength of the wireless charging type signal can represent the strength of the wireless charging type signal. Optionally, the power or voltage of the wireless charging type signal detected in the detection area can be regarded as the signal strength of the wireless charging type signal.

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

Optionally, the control module 20 can select, from multiple detection areas, corresponding to all detection areas where the detected signal intensity of the wireless charging type signal is greater than the first threshold according to the signal strength of the wireless charging signal type signal detected in each detection area. The charging area serves as the target area. As shown in Figure 4, assume that multiple detection areas are respectively detection area W1, detection area W2, detection area W3, and detection area W4. The signal strengths of wireless charging type signals detected by detection area W2 and detection area W3 are greater than For the first threshold, the control module 20 can configure the detection area W2 and the charging area corresponding to the detection area W3 to form a target area.

Alternatively, the control module 20 may select the charging area corresponding to the detection area with the highest signal intensity of the detected wireless charging type signal from multiple detection areas as the target area based on the signal strength of the wireless charging type signal detected in each detection area. As shown in FIG. 4 , assuming that the 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, and the control module 20 can The charging area corresponding to the detection area W2 may constitute a target area.

Alternatively, the control module 20 may determine the position of the wireless charging receiving circuit in the multiple detection areas based on the signal strength of the wireless charging signal detected in each detection area, and use the charging area corresponding to a detection area to which the position belongs as the target area. As shown in Figure 4, assume that multiple detection areas are respectively detection area W1, detection area W2, detection area W3, and detection area W4. The signal strengths of wireless charging type signals detected by detection area W2 and detection area W3 are greater than For the first threshold, the control module 20 can calculate the position of the wireless charging receiving device according to the center positions of the detection areas W2 and W3 and the signal strengths of the wireless charging type signals detected by the detection areas W2 and W3 respectively, and calculate the wireless charging reception. The charging area corresponding to the detection area to which the device's location belongs can be determined as the target area.

In one embodiment, the signal type emitted by at least one electronic device placed on the charging plane may include a wireless charging type signal and an NFC type signal, that is, there is a wireless charging receiving circuit and an NFC circuit on the charging plane. The wireless charging device 1000A may adjust the power of wireless charging to the at least one electronic device on the charging plane 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 can be configured with multiple power adjustment strategies. Wireless charging device 1000A may implement any of a variety of power adjustment strategies.

Exemplarily, the wireless charging device 1000A may respond to the signal type of the signal detected by at least one detection area including a wireless charging type signal and an NFC type signal, and the wireless charging device 1000A adjusts to wirelessly charge the at least one electronic device on the charging plane. The power is less than or equal to the preset limit value. Optionally, the preset limit value may be 0, that is, the wireless charging device 1000A does not perform wireless charging. Alternatively, the preset limit value is a preset value, and the preset value is not 0. The wireless charging device 1000A performs low-power charging. Optionally, the preset limit value may be 5.

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

If the target area overlaps or overlaps with the limited area, the wireless charging device 1000A can control the wireless charging power of the transmitting coil 30 in the target area or the limited area to be less than or equal to the preset limited value. The target area overlaps or overlaps with the limited area, which can reflect that the position of the wireless charging receiving circuit in the charging plane is relatively close to the position of the NFC receiving circuit. The wireless charging device 1000A can control the power of the transmitting coil 30 to wirelessly charge the wireless charging receiving circuit to be less than or equal to the preset limit value, thereby realizing low-power wireless charging of the wireless charging receiving circuit and avoiding damage to the NFC circuit.

If the target area does not overlap with the limited area, the wireless charging device 1000A can control the wireless charging power of the transmitting coil in the target area to be greater than the preset limited value. There is no overlap between the target area and the limited area, which can reflect that the position of the wireless charging receiving circuit in the charging plane is far away from the position of the NFC receiving circuit. The wireless charging device 1000A can control the power of the transmitting coil 30 to wirelessly charge the wireless charging receiving circuit to be greater than the preset limit value, thereby achieving wireless charging of the wireless charging receiving circuit. Optionally, the wireless charging device 1000A can exchange charging parameters with the wireless charging receiving circuit based on wireless charging technology. Generally, the wireless charging device 1000A uses charging parameters provided by a wireless charging receiving circuit, and the wireless charging power of the wireless charging receiving circuit is greater than the power threshold.

The process of determining or selecting a target area by the wireless charging device 1000A is introduced below. In the detection coil array 10, multiple detection areas can be used to detect the signal strength of wireless charging type signals emitted by electronic devices on the charging plane. In the embodiment of the present application, the signal strength of the wireless charging type signal can represent the strength of the wireless charging type signal. Optionally, the power or voltage of the wireless charging type signal detected in the detection area can be regarded as the signal strength of the wireless charging type signal.

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

Optionally, the control module 20 can select, from multiple detection areas, corresponding to all detection areas where the detected signal intensity of the wireless charging type signal is greater than the first threshold according to the signal strength of the wireless charging signal type signal detected in each detection area. The charging area serves as the target area. Alternatively, the control module 20 may select the charging area corresponding to the detection area with the highest signal intensity of the detected wireless charging type signal from multiple detection areas as the target area based on the signal strength of the wireless charging type signal detected in each detection area. Alternatively, the control module 20 may determine the position of the wireless charging receiving circuit in the multiple detection areas based on the signal strength of the wireless charging signal detected in each detection area, and use the charging area corresponding to a detection area to which the position belongs as the target area.

The process of determining the limited area by the wireless charging device 1000A is introduced below. In the detection coil array 10, multiple detection areas can be used to detect the signal strength of near field communication type signals emitted by electronic devices on the charging plane. In the embodiment of the present application, the signal strength of the near field communication type signal can represent the strength of the near field communication type signal. Optionally, the power or voltage of the near field communication type signal detected in the detection area can be regarded as the signal strength of the near field communication type signal.

The control module 20 in the wireless charging device 1000A can select a charging area corresponding to a partial detection area from the plurality of detection areas as a limited area based on the signal strength of the near field communication type signal detected in at least one detection area. Optionally, the control module 20 may, according to the signal strength of the wireless charging signal type signal detected in each detection area, correspond to all detection areas where the detected signal strength of the near field communication type signal is greater than the second threshold from the multiple detection areas. The charging area is used as a limited area. As shown in Figure 4, it is assumed that the multiple detection areas are respectively 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 detection area W2 and detection area W3 is greater than The second threshold value, the charging area corresponding to the detection area W2 and the detection area W3 can constitute a limited area.

In one example, the control module 20 can control the alignment mechanism 40 to move the transmitting coil 30 to the target area according to the overlap or overlap between the target area and the limited area, and control the transmitting coil 30 in the target area or the limited area to perform wireless charging. The power is less than or equal to the preset limit value. For example, the control module 20 can control the alignment mechanism 40 to move the transmitting coil 30 to the target area, and control the wireless charging power of the transmitting coil 30 to be less than the preset limit value.

In another example, the control module 20 can control the alignment mechanism 40 to move the transmitting coil 30 to the target area according to the fact that the target area does not overlap with the limited area, and control the wireless charging power of the transmitting coil 30 to be greater than the preset limit value. .

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 the first printed circuit board (PCB). The first PCB may be disposed in the cavity of the wireless charging device 1000A, and the first PCB may be parallel to the charging plane of the wireless charging device 1000A. The detection coil array 10 includes a plurality of first detection coils, the plurality of first detection coils are arranged on the first PCB, and the plurality of first detection coils are arranged along a first direction. The detection coil array 10 includes a plurality of second detection coils, the plurality of second detection coils are arranged on the first PCB, and the plurality of second detection coils are arranged along the first direction. The first direction and the second direction are not parallel. The aforementioned first resonance signal may be a resonance signal coupled to any detection coil in the detection coil array 10 . The first detection coil and the second detection coil may both be used to detect the wireless charging receiving circuit and the NFC circuit.

FIG. 5A exemplarily shows a specific structural schematic diagram of the detection coil array 10. Taking the first direction as the row direction and the second direction as the column direction as an example, the row direction is perpendicular to the column direction. As shown in FIG. 5A , the detection coil array 10 may include n detection coils arranged in the row direction and m detection coils arranged in the column direction. For ease of introduction, the detection coils arranged along the row direction are called row coils R, where the i-th row coil is denoted Ri. The detection coils arranged along the column direction are called column coils C, and the jth column coil is marked as Cj. Optionally, n row coils can be arranged in an overlapping manner, which can avoid the situation where the coupling magnetic flux between the receiving coil and each row coil in the wireless charging receiving device is zero. m column coils can be arranged overlappingly, which can avoid the situation where the coupling magnetic flux between the receiving coil and each column coil in the wireless charging receiving circuit is zero. Thereby ensuring that at least one coil in the detection coil array 10 can detect the receiving coil in the wireless charging receiving circuit. In an actual scenario, the number of detection coils and the size of the detection coils included in the detection coil array 10 are related to detection accuracy.

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

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

FIG. 5B shows an exemplary structural diagram of the control module 20 . The control module 20 may include a control circuit 20A and a detection circuit 20B. The detection circuit 20B is coupled to each row coil R and each column coil C in the detection coil array 10 .

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

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

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

The first strobe switch circuit 24A can connect the target first connection terminal 24A1 and the second connection terminal 24A2 under the control of the control circuit 20A. The target first connection terminal 24A1 can be any one of the aforementioned first connection terminals 24A1 The first connection terminal realizes the connection between the detection coil coupled to the target first connection terminal 24A1 and the output terminal of the first excitation circuit 22A connected to the second connection terminal 24A2, and the input terminal of the first acquisition circuit 23A, for ease of introduction. , the detection coil coupled to the target first connection end 24A1 is recorded as the target row coil. For example, the first strobe switch circuit 24A may include multiple switches to implement the above functions.

The output end of the first excitation circuit 22A can be coupled with the first strobe switch circuit 24A, and the first excitation circuit 22A can output a pulse signal, which can also be called an excitation signal, under the control of the control circuit 20A. For example, the first excitation circuit 22A may include an RLC network 22A1 and a first switch 22A2. The power supply VC may be coupled to the RLC network, and the power supply VC is used to provide a stable voltage to the first switch 22A2. The control circuit 20A can control the on time or the off time of the first switch 22A2 to provide pulse signals to the RLC network 22A1. RLC network 22A1 is used to limit current and divide voltage on pulse signals. Optionally, the RLC network can also have a filtering function.

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 strobe switch circuit 24A. The pulse signal acts on the target row coil, and the target row coil transfers energy to the receiving coil in the wireless charging device through coupling, which can cause the receiving coil in the wireless charging device to subsequently generate self-resonance, and due to the self-resonance of the receiving coil in the wireless charging device, The resonance signal generated by the resonance can be coupled to the target row coil.

The pulse signal acts on the target row coil. The target row coil can transfer energy to the NFC circuit through coupling, which can cause the receiving coil in the NFC circuit to subsequently generate self-resonance, and the resonance signal generated by the self-resonance of the NFC circuit can be coupled to The target row is on the coil.

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

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

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

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

Optionally, the control module 20 can perform detection operations on each row coil in the detection coil array 10 in a traversal manner. In the embodiment of the present application, in the control module 20, the control circuit 20A can control the first detection branch 21A to send a pulse signal to a row coil, and determine whether the resonance signal received by a row coil contains a signal of the first frequency and whether Signals containing the second frequency are detected. This process can be recorded as detecting a row coil. After the control module 20 performs the detection operation on one row coil, it performs the detection operation on another row coil. After the control module 20 performs a detection operation on each row coil in the detection coil array 10, it can be regarded as completing the traversal of all row coils in the detection coil array 10.

Next, the second detection branch 21B will be introduced. The second detection branch 21B is coupled to each column coil in the detection coil array. The second detection branch 21B may include a second excitation circuit 22B, a second sampling circuit 23B, and a second strobe switch circuit 24B.

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

The second strobe switch circuit 24B can connect the target third connection terminal 24B1 and the fourth connection terminal 24B2 under the control of the control circuit 20A. The target third connection terminal 24B1 can be any one of the aforementioned plurality of third connection terminals 24B1 The first connection end realizes the connection between the detection coil coupled to the target third connection end 24B1 and the output end of the second excitation circuit 22B connected to the fourth connection end 24B2, and the input end of the second sampling circuit 23B, for ease of introduction. , the detection coil coupled to the target third connection terminal 24B1 is recorded as the target column coil. Exemplarily, the second strobe switch circuit 24B may include multiple switches to implement the above functions.

The output end of the second excitation circuit 22B can be coupled with the second strobe switch circuit 24B, and the second excitation circuit 22B can output a pulse signal, which can also be called an excitation signal, under the control of the control circuit 20A. Exemplarily, the second excitation circuit 22B may include an RLC network 22B1 and a second switch 22B2. Power supply VC may be coupled to the RLC network and power supply VC is used to provide a stable voltage to switch 22A2. The control circuit 20A can control the on time or the off time of the second switch 22B2 to provide pulse signals to the RLC network 22B1. RLC network 22B1 is used to limit current and divide voltage on pulse signals. Optionally, the RLC network can also have a filtering function.

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 gate switch circuit 24B. The pulse signal acts on the target column coil, and the target column coil transfers energy to the receiving coil in the wireless charging device through coupling, which can cause the receiving coil in the wireless charging device to subsequently generate self-resonance, and due to the self-resonance of the receiving coil in the wireless charging device, The resonance signal produced by the resonance can be coupled to the target column coil.

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

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

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

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

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

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 sends a pulse signal and detects the resonance signal coupled to the target row coil, and the second detection branch 21B sends a pulse signal and detects the resonance signal coupled to the target column coil. These two processes can be synchronized. Parallel or asynchronous.

Optionally, the control module 20 can perform a detection operation on each column coil in the detection coil array 10 in a traversal manner. In the embodiment of the present application, in the control module 20, the control circuit 20A can control the second detection branch 21B to send a pulse signal to a column coil, and determine whether the resonance signal received by a column coil contains a signal of the first frequency and whether Signals containing the second frequency are detected. This process can be recorded as a detection operation for a column coil. After the control module 20 performs a detection operation on one column coil, it performs a detection operation on another column coil. After the control module 20 performs a detection operation on each column coil in the detection coil array 10 , it can be regarded as completing the traversal of all column coils in the detection coil array 10 .

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

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

The wireless charging device 1000A may select one or more adjacent first detection coils based on a comparison result between the signal strength of the wireless charging type signals detected by the plurality of first detection coils and the first threshold. One or more adjacent second detection coils are selected according to a comparison result between the signal strength of the wireless charging type signal detected by the plurality of second detection coils and the first threshold. One or more detection areas are selected according to the selected one or more adjacent first detection coils and the selected one or more adjacent second detection coils, and the selected one or more detection areas The charging area corresponding to the area is used as the target area.

In one example, the control circuit 20A may select a column coil whose voltage amplitude of the wireless charging type signal is greater than the first voltage threshold based on a comparison between the signal strength of the wireless charging type signal detected by each column coil and the first voltage threshold. The control circuit 20A may select one or more detection areas based on the selected one or more adjacent row coils and the selected one or more adjacent column coils, and the selected one or more detection areas are The selected one or more adjacent row coils and the selected one or more adjacent column coils form a detection area. For example, the portion where the projection of the selected one or more adjacent row coils on the charging plane overlaps with the projection of the selected one or more adjacent column coils on the charging plane is one or more of the selected locations. Multiple detection areas. The control circuit 20A may use the charging area corresponding to the selected one or more detection areas as the target area.

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

The position of the wireless charging receiving circuit may include the position in the first direction and the position in the second direction. For example, the position of the wireless charging receiving circuit may include the position row2_pos in the row direction and the position col2_pos in the column direction. For ease of introduction, please refer to Figure 5D. In the embodiment of this application, in the detection coil area on the last row along the column direction, a vertex of the first detection coil area along the row direction is used as the reference origin O, and the position reference coordinates are set system, the X-axis direction of the position reference coordinate system is the same as the row direction, and the Y-axis direction is opposite to the column direction. It should be noted that setting the position reference coordinate system is convenient for clarifying the relationship between different positions. In practical applications, other methods can be used to set the position reference coordinate system, which is not specifically limited in this application.

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 the detection coil array 10 through any detection coil array 10, so as to control the alignment mechanism 40 to drive a transmitting coil and the Align the position of the receiving coil of the electronic device. In the embodiment of the present application, 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.

The control module 20 can control the row coil Ri to send a pulse signal, and sample the amplitude of the second frequency signal in the resonant signal coupled to the row coil Ri to obtain the amplitude V2ri of the second frequency signal, where i ranges from 1 to n. That is, the control module 20 can traversely control each row coil in the detection coil array 10 to send a pulse signal, and sample the amplitude of the second frequency signal in the signal coupled by the row coil. The geometric center position of the row coil Ri is recorded as Lri, Lri=i+R0, and R0 is a preset parameter related to the coil size. Among them, the probability that the row coil Ri detects the wireless charging receiving circuit is marked as Pri, where,

In order to highlight the influence of the main detection values, the probability square method can be used to determine the recalculation probability of the row coil Ri

According to the concept of statistics, the position of the wireless charging receiving circuit in the row direction in the charging plane can be obtained.

Similarly, the control module 20 can control the column coil Cj to send a pulse signal, and sample the amplitude of the second frequency signal in the resonant signal coupled to the column coil Cj to obtain the amplitude V2cj of the second frequency signal, where j is Traverse from 1 to m. That is, the control module 20 can traversely control each column coil in the detection coil array 10 to send a pulse signal, and sample the amplitude of the second frequency signal in the signal coupled by the column coil. The geometric center position of the column coil Cj is Lcj, Lcj=j+C0, and C0 is a preset parameter related to the coil size. Among them, the probability that column coil Cj detects the wireless charging receiving circuit is recorded as P2cj,

In order to highlight the influence of the main detection values, the probability square method can be used to determine the recalculation probability of the column coil Cj

According to the concept of statistics, the position of the wireless charging receiving circuit in the column direction in the charging plane can be obtained.

Optionally, the detection coil array 10 can detect the position of the wireless charging receiving circuit on the charging plane. The control module 20 may determine at least one detection area to which the determined position of the wireless charging receiving circuit on the charging plane belongs as the target area. In this way, the alignment mechanism 40 moves the transmitting coil 30 to the target area, and wireless charging is performed after the transmitting coil 20 is aligned with the wireless charging receiving circuit, which can improve the wireless charging efficiency.

Alternatively, the detection coil array 10 may detect the position of the wireless charging receiving circuit on the charging plane. The control module 20 drives the alignment mechanism 40 to move the transmitting coil 30 so that the center position of the charging area formed by the transmitting coil 30 is close to or coincident with the position of the wireless charging receiving circuit on the projection of the charging plane, thereby lifting the transmitting coil 30 and the wireless charging receiving circuit. Alignment effect to improve wireless charging efficiency.

The aforementioned defined area may include a charging area corresponding to one or more detection areas determined based on one or more adjacent first detection coils and one or more adjacent second detection coils, wherein: said one or multiple adjacent first detection coils are determined based on a comparison result between the signal strength of the near field communication type signal detected by the multiple first detection coils and the second threshold, and the one or more adjacent second detection coils are The coil is determined based on a comparison result between the signal strength of the near field communication type signal detected by the plurality of second detection coils and the second threshold.

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

The wireless charging device 1000A may select one or more adjacent first detection coils according to a comparison result between the signal strength of the near field communication type signals detected by the plurality of first detection coils and the second threshold. One or more adjacent second detection coils are selected according to a comparison result between the signal strength of the near field communication type signals detected by the plurality of second detection coils and the second threshold. One or more detection areas are selected according to the selected one or more adjacent first detection coils and the selected one or more adjacent second detection coils, and the selected one or more detection areas The charging area corresponding to the area is used as the limited area.

In one example, the control circuit 20A may select a column coil whose voltage amplitude of the near field communication type signal is greater than the second voltage threshold based on a comparison result between the signal strength of the near field communication type signal detected by each column coil and the second voltage threshold. . The control circuit 20A may select one or more detection areas based on the selected one or more adjacent row coils and the selected one or more adjacent column coils, and the selected one or more detection areas, A detection area formed by the selected one or more adjacent row coils and the selected one or more adjacent column coils. For example, the portion where the projection of the selected one or more adjacent row coils on the charging plane overlaps with the projection of the selected one or more adjacent column coils on the charging plane is one or more of the selected locations. Multiple detection areas. The control circuit 20A may use the charging area corresponding to the selected one or more detection areas as the limited area.

In another example, for ease of explanation, assume that in the detection coil array 10 , the resonance signals received by the q1 row coils include signals of the first frequency, and the resonance signals received by the q2 column coils include signals of the first frequency. The control module 20 may determine or select the charging restriction area corresponding to the NFC circuit according to the positions of the q1 row coils and q2 column coils.

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

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

Alternatively, the control module 20 may determine or select the restricted area based on the center positions of the row coils Rz1, Rz2, column coils Cz1 and Cz2. For ease of introduction, the center position of the coil will be abbreviated as the position of the coil. The boundary vertices of the restricted area may be determined based on the positions of row coils Rz1, row coils Rz2, column coils Cz1 and column coils Cz2. In the charging plane of the wireless charging device 1000A, the position of the row coil Rz1 in the row direction is x _Rz1 , and the position of the row coil Rz2 in the row direction is x _Rz2 . The position of column coil Cz1 in the column direction is y _Cz1 , and the position of column coil Cz2 in the column direction is y _Cz2 .

For example, the restricted area is a rectangle. The four vertices of the restricted area are denoted as vertex W1, vertex W2, vertex W3, and vertex W4. In one example, the hatched portion in FIG. 5E shows the positions of the four vertices of the restricted area. The control module 20 can directly determine each of the restricted areas based on the position of the row coil Rz1 in the row direction, the position of the row coil Rz2 in the row direction, the position of the column coil Cz1 in the column direction y _Cz1 , and the position of the column coil Cz2 in the column direction. The position of the vertex. Among them, the positions of vertex W1, vertex W2, vertex W3, and vertex W4 can be respectively (x _Rz1 , y _Cz1 ), (x _Rz2 , y _Cz1 ), (x _Rz1 , y _Cz2 ) and (x _Rz2 , y _Cz2 ) .

Or, the hatched part in FIG. 5F shows the positions of the four vertices of the restricted area. The control module 20 may store the row reservation distance parameter xm and the column reservation distance parameter ym. The control module 20 can store the row reservation distance parameter xm, the column reservation distance parameter ym, the position of the row coil Rz1 in the row direction, the position of the row coil Rz2 in the row direction, and the position of the column coil Cz1 in the column direction as y _Cz1 , The position of the column coil Cz2 in the column direction determines the position of each vertex of the restricted area. Among them, the positions of vertex W1, vertex W2, vertex W3, and vertex W4 can be respectively (x _Rz1 -xm, y _Cz1 +ym), (x _Rz1 +xm, y _Cz1 +ym), (x _Rz1 -xm, y _Cz2 -ym) and (x _Rz2 , y _Cz2 -ym).

In other possible designs, the restricted area can be circular or oval. Alternatively, the restricted area may be irregularly shaped. The shape of the restricted area can be determined by testing.

Through the above introduction, it can be understood that the multiple functions of the multiple first detection coils and the multiple second detection coils in the detection coil array 10 provided by the embodiment of the present application, such as detecting the signal type of the signal emitted by the electronic device, determining a detection area Whether a wireless charging receiving circuit is placed in the corresponding charging area, determine the position of the wireless charging receiving circuit on the charging plane, determine whether an NFC circuit is placed in the charging area corresponding to a detection area, and detect the position of the NFC circuit on the charging plane. In some application scenarios, a plurality of first detection coils and a plurality of second detection coils may perform one or more functions, which are not too limited in the embodiments of the present application.

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 on the charging plane can cover the entire detection area included in the detection coil array 10 . The NFC detection coil is used to detect the NFC circuit placed on the charging plane. Among them, the plurality of first detection coils and the plurality of second detection coils can realize one or more of the following functions, such as determining whether a wireless charging receiving circuit is placed in the charging area corresponding to a detection area, determining whether the wireless charging receiving circuit is placed on the charging plane, The position of the circuit, detects the position of the NFC circuit on the charging plane. For the implementation of the plurality of first detection coils and the plurality of second detection coils to perform the foregoing functions, please refer to the relevant introductions in the foregoing embodiments.

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

FIG. 6B illustrates an exemplary structural diagram of the control module 20 . The control module 20 may include a control circuit 20A and a detection circuit 20B. Detection circuit 20B is coupled to a corresponding array of detection coils. 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 reading circuit. Optionally, the NFC protocol card reading circuit may support NFC communication protocol. The NFC protocol card reading circuit can process the radio frequency signal or resonance 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, and realize the detection of signals from electronic devices placed on the charging plane. signal type.

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

First, the third detection branch 21C is introduced. The third detection branch 21C is coupled to each row of coils in the detection coil array. The third detection branch 21C may include a first excitation circuit 22A, a first strobe switch circuit 24A, and a third sampling circuit 23C. The similarities between the control module shown in FIG. 6C and the control module shown in FIG. 5C will not be described again. For example, the first excitation circuit 22A and the first strobe switch circuit 24A can be referred to the relevant introduction in the foregoing examples, and will not be described again here.

The pulse signal output by the first excitation circuit 22A is transmitted to the target row coil via the first strobe switch circuit 24A. The pulse signal acts on the target row coil, and the target row coil transfers energy to the receiving coil in the wireless charging device through coupling, which can cause the receiving coil in the wireless charging device to subsequently generate self-resonance, and due to the self-resonance of the receiving coil in the wireless charging device, The resonance signal generated by the resonance can be coupled to the target row coil.

The resonant signal coupled to the target row coil is transmitted to the input end of the third sampling circuit 23C via the first strobe 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.

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

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

The fourth detection branch 21D is introduced below. The fourth detection branch 21D is coupled to each column coil in the detection coil array. The second detection branch 21B may include a second excitation circuit 22B, a second gate switch circuit 24B and a fourth sampling circuit 23D.

The pulse signal output by the second excitation circuit 22B is transmitted to the target column coil via the second strobe switch circuit 24B. The pulse signal acts on the target column coil, and the target column coil transfers energy to the receiving coil in the wireless charging device through coupling, which can cause the receiving coil in the wireless charging device to subsequently generate self-resonance, and due to the self-resonance of the receiving coil in the wireless charging device, The resonance signal produced by the resonance can be coupled to the target column coil.

The resonant signal coupled to the target column coil is transmitted to the input end of the fourth sampling circuit 23D via the second gate 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.

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

Optionally, the control module 20 may perform detection operations on each column coil in the detection coil array 10 in a traversal manner. In the embodiment of the present application, in the control module 20, the control circuit 20A can control the fourth detection branch 21D to send a pulse signal to a column coil, and detect whether the resonance signal received by the column coil contains a signal of the second frequency. . This process can be recorded as a detection operation for a column coil. After the control module 20 performs a detection operation on one column coil, it performs a detection operation on another column coil. After the control module 20 performs a detection operation on each column coil in the detection coil array 10 , it can be regarded as completing the traversal of all column coils in the detection coil array 10 .

Optionally, the first detection branch 21A and the second detection branch 21B may work synchronously, in parallel, or asynchronously. That is, the first detection branch 21A sends a pulse signal and detects the resonance signal coupled to the target row coil, and the second detection branch 21B sends a pulse signal and detects the resonance signal coupled to the target column coil. These two processes can be synchronized. Parallel or asynchronous.

The wireless charging device 1000A is provided based on any of the above embodiments. The wireless charging system 1000 provided by this application may include multiple wireless charging devices 1000A. The surface of the wireless charging system 1000 serves as a charging plane for placing at least one electronic device. The charging plane of the wireless charging system 1000 is formed by a combination of charging planes of multiple wireless charging devices 1000A. The relative positional relationship between the charging planes of the plurality of wireless charging devices 1000A may be any of the following positional relationships.

As shown in FIG. 7A , the charging planes of the plurality of wireless charging devices 1000A are provided on the surface of the wireless charging system, and there are gaps between the charging planes of the plurality of wireless charging devices 1000A.

As shown in FIG. 7B , the charging planes of multiple wireless charging devices 1000A are arranged on the surface of the wireless charging system, and there is no gap or overlap between the charging planes of multiple wireless charging devices 1000A.

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

In other application scenarios, multiple charging planes include 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, there is overlap or overlapping between multiple sets of charging planes.

As shown in FIG. 7D , a plurality of charging planes are respectively charging plane 10_1, charging plane 10_2, charging plane 10_3, and charging plane 10_4 for explanation. The plurality of charging planes includes 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 group of charging planes and the second group of charging planes are arranged along the column direction. The charging plane 10_1 and the charging plane 10_2 are arranged in the first row, and the charging plane 10_3 and the charging plane 10_4 are arranged in the second row. The overlapping portion between charging plane 10_1 and charging plane 10_2 includes area S1 and area S2. The overlapping portion between charging plane 10_1 and charging plane 10_3 includes area S3 and area S2. The overlap between charging plane 10_1 and charging plane 10_4 includes area S2. The overlapping portion between the charging plane 10_2 and the charging plane 10_3 includes area S2. The overlap between charging plane 10_2 and charging plane 10_4 includes area S2 and area S4. The overlap between charging plane 10_3 and charging plane 10_4 includes area S2 and area S5.

The projection of the wireless charging range of the transmitting coil of a wireless charging device 1000A on the charging plane can be recorded as the charging range of the wireless charging device 1000A or the charging range of the transmitting coil. Optionally, in the case of overlap or charging between two adjacent charging planes, in a possible situation, the charging ranges of two adjacent wireless charging devices 1000A do not overlap or overlap. In another possible situation, as shown in FIG. 7E , the charging ranges of two adjacent wireless charging devices 1000A overlap or overlap. For wireless charging receiving circuits placed in areas where the charging ranges of two adjacent wireless charging devices 1000A overlap or overlap, the transmitting coils in the two adjacent wireless charging devices 1000A can wirelessly charge the wireless charging receiving circuit. .

In a possible implementation, in the wireless charging system 1000, the charging planes of two adjacent wireless charging devices 1000A overlap or overlap. The controller in the wireless charging system 1000 may include the control module 20 in each wireless charging device 1000A, then the controller includes the functions of the control module 20 in each of the previous embodiments. The controller may determine the position of the wireless charging receiving circuit placed on the charging plane of each wireless charging device 1000A. For ease of introduction, two adjacent wireless charging devices 1000A are respectively recorded as the first device and the second device. The charging plane of the first device is denoted as the first charging plane, and the charging plane of the second device is denoted as the second charging plane.

The controller of the wireless charging system 1000 may 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 in 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, which is recorded as the row direction position row2_pos2 and the column direction position col2_pos2. The controller uses the second device to detect the position of the wireless charging receiving circuit on the second charging plane, that is, the position row2_pos2 in the row direction and the position col2_pos2 in the column direction. Reference can be made to the above related descriptions, which will not be described again here.

For the wireless charging receiving circuit located in the overlapping area of the two charging planes, the control module 20 can determine the position of the wireless charging receiving circuit through the average algorithm, realize the position correction of the wireless charging receiving circuit, and improve the connection between the transmitting coil and the wireless charging receiving circuit. The alignment effect of the circuit improves wireless charging efficiency.

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

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 receiving circuit is located in the overlapping area between the charging plane of the first device and the charging planes of S other wireless charging devices, S is a positive integer, and for each wireless charging device in the S other wireless charging devices, control The device can detect the position of the wireless charging receiving circuit in the charging plane of the wireless charging device through the wireless charging device. The controller may determine the average value of the row direction position of the wireless charging receiving circuit row2_pos1 detected by the first device and the row direction position of the wireless charging receiving circuit determined by each of the S wireless charging devices as The final row direction position of the wireless charging receiving device. The controller may determine the average value of the column-direction position col2_pos1 of the wireless charging receiving circuit detected by the first device and the column-directed position of the wireless charging receiving circuit detected by each of the S other wireless charging devices. The final column direction position of the wireless charging receiving device.

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

The controller can determine the final column direction position y2 _ad of the wireless charging receiving circuit based on the column direction position of the wireless charging receiving circuit detected by each of the K wireless charging devices, where

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

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

In the embodiment of the present application, each transmitting coil has a corresponding movable area. FIG. 8A exemplarily shows the movable area of the center of each transmitting coil. The movable area of the center of the transmitting coil represents the range within which the center of the transmitting coil can move when the alignment mechanism 40 drives the transmitting coil to move.

In the wireless charging system 1000, there is at least one second transmitting coil on the side of the first transmitting coil facing the position of the wireless charging receiving circuit, and one of the at least one second transmitting coil is located there. on the path between the center position of the charging area of the first transmitting coil and the position of the wireless charging receiving circuit.

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

FIG. 8B shows a plurality of transmitting coils included in the wireless charging system according to an exemplary embodiment, which are respectively designated as transmitting coil 1, transmitting coil 2, and transmitting coil 3. The transmitting coil 1 may be implemented as the aforementioned first transmitting coil. The controller can determine whether there are other transmitting coils on the path between the center position of the charging range of the transmitting coil 1 and the wireless charging receiving circuit based on the position of each transmitting coil. It is assumed that the position of the transmitting coil 2 is located on the path between the center position of the charging range of the transmitting coil 1 and the wireless charging receiving circuit.

The controller controls the alignment module to move the transmitting coil 2 and the transmitting coil 1 synchronously. For example, the controller may move the transmitting coil 2 along the row direction away from the position of the wireless charging receiving circuit, and the moving speed is the second speed. The controller can move the transmitting coil 1 along the row direction toward the position of the wireless charging receiving circuit, and the moving speed is the first speed. Wherein, the second speed is greater than the first speed. Synchronously driving the transmitting coil 2 and the transmitting coil 1 can reduce the length of the alignment process between the transmitting coil 1 and the wireless charging receiving circuit.

In one example, for ease of introduction, the straight line between the center position of the current charging range of the transmitting coil 1 and the center position of the wireless charging receiving circuit is recorded as the first reference straight line. The controller may determine the movement range of the charging range of the transmitting coil 1 after the center position of the charging range of the transmitting coil 1 moves along the first reference straight 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. On the contrary, if the charging range of the transmitting coil 2 does not overlap with the moving range, the controller may determine that the position of the transmitting coil 2 is not on the path between the center position of the charging range of the transmitting coil 1 and the wireless charging receiving circuit.

As shown in FIG. 8C , the black point M1 is the center position of the charging range of the transmitting coil 1 , and the black point M2 is the center position of the receiving coil of the electronic device. The straight line L1 is a straight line between the center position of the charging range of the transmitting coil 1 and the center position of the wireless charging receiving circuit. The hatched portion of the horizontal line is the moving range of the charging range of the transmitting coil 1 . For example, the charging range of the transmitting coil 2 overlaps with the movement range, and 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.

Then, the controller can control the alignment module to control the transmitting coil 2 to move in the row direction away from the position of the wireless charging receiving circuit, and the moving speed is the second speed. The controller controls the alignment module to control the transmitting coil 1 to move along the row direction toward the position of the wireless charging receiving circuit, and the moving speed is the first speed. Wherein, the second speed is greater than the first speed.

Figure 9A shows an exploded view of a wireless charging system according to an exemplary embodiment. As shown in Figure 9A, the wireless charging system may include an upper case 901A, a lower case 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.

The cavity formed by the cooperation of the upper housing 901A and the lower housing 901B can be used to accommodate the detection PCB 902, at least one transmitting coil 903, the liner 904, the alignment module, and the inverter and control PCB 906. For example, the detection coil array of the wireless charging device in any of the above embodiments can be provided on the detection PCB 902, as well as the detection circuit coupled to each detection coil array. A backing plate 904 is provided between the at least one transmitting coil 903 and the detection PCB 902 . The alignment module can drive each transmitting coil 903 to move and align with the wireless charging receiving circuit. The inverter and control PCB 906 may be provided with an inverter circuit and the controller in any of the above embodiments.

Optionally, at least one groove 907 is provided on the outer surface of the upper housing 901A of the wireless charging system. The embodiment of the present application does not specifically limit the number of grooves 907. The number of grooves 907 may 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.

Optionally, the outer surface of the upper case 901A of the wireless charging system has no groove 907 and is a flat surface, so that the appearance is more beautiful, the manufacturing process is simple, and the manufacturing process is simple.

For example, as shown in FIG. 9A, the wireless charging system may include three transmitting coils 903. Alignment modules can be used to drive each transmit coil to move. Figure 9B shows a schematic diagram of the connection relationship between the detection PCB 902, three transmitting coils 903, the alignment module, the inverter and the control PCB 906 according to an exemplary embodiment.

The three transmitting coils 903 may be respectively denoted as a first transmitting coil 903A, a second transmitting coil 903B, and a third transmitting coil 903C. The alignment module 905 may include guide rails and multiple alignment mechanisms. The plurality of alignment mechanisms can be respectively recorded as a first motor module 905A, a second motor module 905B, and a third motor module 905C.

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

The inverter and control circuit PCB 906 is provided with a first motor drive circuit 9061A, a second motor drive circuit 9061B, and a third motor inverter circuit 9061C, respectively used to control the first motor module 905A, the second motor module 905B, and The third motor module 905C. Each motor drive circuit is coupled with the corresponding motor module through motor control wiring.

The inverter and control circuit PCB 906 is also provided with 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 respectively coupled to the first transmitting coil 903A, the second transmitting coil 903B, and the third transmitting coil 903C. Each inverter circuit is coupled with the corresponding transmitting coil through the transmitting power wiring, and can control the transmitting coil for wireless charging.

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

The structural exploded view of the wireless charging system provided in the embodiment of the present application is only used to illustrate the structural form of the wireless charging system and is not used as a specific limitation on the structure of the wireless charging system.

To facilitate understanding, based on the structure of the detection coil array of the wireless charging device shown in FIG. 5C , FIG. 10 shows a functional schematic diagram of the wireless charging device according to an exemplary embodiment. The wireless charging system provided by the embodiment of the present application may include a wireless charging receiving circuit position detection function, a restricted area determining function, a transmitting coil alignment function, and a target area determining function. Optionally, the wireless charging system can also include system protection functions and transmitting coil wireless charging functions.

In this embodiment, in the wireless charging system, the system protection function 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 the voltage, current, temperature and other parameters collected by the sampling protection circuit.

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

The position detection function of the wireless charging receiving circuit can be implemented based on the controller and each wireless charging receiving device. The controller can detect the position of the wireless charging receiving circuit through each wireless charging device. Optionally, if there is overlap between the charging planes of each wireless charging device, the controller can also adjust the position of the wireless charging receiving circuit when the position of the wireless charging receiving circuit is located in the overlapping area between multiple charging planes. Make corrections.

The function of determining the restricted area can be implemented based on the controller and each wireless charging device. The controller determines the limited area through any wireless charging device. Optionally, the wireless charging system can also have an NFC circuit position detection function, which can also be implemented based on the controller and each wireless charging device.

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

The transmitting coil alignment function can be realized based on the controller and alignment module. The controller can control the alignment module to drive the transmitting coil so that the transmitting coil is aligned with the wireless charging receiving circuit.

FIG. 11 shows a schematic flowchart of the working process of the wireless charging system according to an exemplary embodiment. The working process of the wireless charging system may include the following steps:

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

The wireless charging system can control each transmitting coil to detect foreign objects. The wireless charging system can control each transmitting coil to detect foreign objects according to the foreign object detection method in the existing wireless charging system. The wireless charging system can determine the charging area corresponding to the transmitting coil as the area where the foreign object is present based on the transmitting coil that detects the presence of the foreign object. Since the wireless charging system can control each transmitting coil for wireless charging, it can know the status of the transmitting coils that are working, the transmitting coils that are not working, and the failed transmitting coils. Wherein, the transmitting coil that is working may refer to the transmitting coil that is being wirelessly charged, and the transmitting coil that is not working may refer to the transmitting coil that is not malfunctioning and is not being wirelessly charged.

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, step S1003 is executed next. If not, step S1004 is executed next.

The wireless charging system can determine whether there are foreign objects on the surface of the wireless charging system and whether there is a working transmitting coil in the system based on the information obtained in step S1001. If there are foreign objects on the surface of the wireless charging system, or there is a working transmitting coil, step S1003 is performed next. If there are no foreign objects on the surface of the wireless charging system and there is no working transmitting coil, step S1004 is performed next.

Step S1003, the wireless charging equipment belonging to each charging plane in the first area scans and detects the wireless charging receiving circuit, where the first area is the charging area corresponding to the working transmitting coil except for the area where foreign matter is present on the surface of the wireless charging system. area, and the area outside the charging range corresponding to the faulty transmitting coil.

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

Step S1004: Scan and detect wireless charging receiving circuits on the wireless charging equipment belonging to each charging plane on the surface of the wireless charging system.

The wireless charging system can traverse and detect the wireless charging receiving circuit on each charging plane on the surface of the wireless charging system. For example, the wireless charging system can traverse control each charging plane to detect the wireless charging receiving circuit. If the wireless charging receiving circuit is detected, the operation of step S1005 can be performed. If the wireless charging receiving circuit is not detected, the operation of step S1001 can be performed again.

Step S1005: Calculate the position of the wireless charging receiving circuit.

When the wireless charging device belonging to any charging plane detects the wireless charging receiving circuit, the wireless charging system can calculate the position of the wireless charging receiving circuit. Assuming that the wireless charging device to which the first charging plane belongs detects the wireless charging receiving circuit, the wireless charging system can detect the position of the wireless charging receiving circuit through the wireless charging device to which the first charging plane belongs.

Step S1006: Determine whether the position of the wireless charging receiving circuit is within the overlapping area of multiple charging planes. If yes, step S1007 is executed next. If not, step S1008 is executed next.

After determining that the position of the wireless charging receiving circuit is within the overlapping area of multiple charging planes, the wireless charging system can correct the position of the wireless charging system to improve wireless charging efficiency, and then perform step S1007. If the position of the wireless charging receiving circuit is not within the overlapping area of any two charging planes, the position of the wireless charging receiving circuit may not be corrected, and step S1008 is performed next.

Step S1007, correct the position of the wireless charging receiving circuit.

Assuming that the wireless charging receiving circuit is within the overlapping area of the first charging plane and the second charging plane, the wireless charging system can use the wireless charging device belonging to the second charging plane to detect the wireless charging receiving circuit and calculate the position of the wireless charging receiving circuit . The wireless charging system can use the position of the wireless charging receiving circuit detected by the wireless charging device belonging to the first charging plane and the position of the wireless charging receiving circuit detected by the wireless charging device described in the second charging plane, and combine these two positions. The average value is used as the corrected position of the wireless charging receiving circuit.

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

The wireless charging system can align the first transmitting coil with the wireless charging receiving circuit, where the first transmitting coil is a transmitting coil whose center position of the charging range is close to the position of the wireless charging receiving circuit. The wireless charging system can determine the movement path of the first transmitting coil and the wireless charging receiving circuit for alignment, and determine whether there are other transmitting coils on the movement path. If there are other transmitting coils on the movement path, the movement paths of the other transmitting coils on the movement path are determined so that the other transmitting coils avoid the movement path.

Step S1009, control the alignment module to move the at least one transmitting coil.

The wireless charging system can control each transmitting coil in the system except the second transmitting coil to avoid the movement path of the first transmitting coil and to avoid the movement path of the second transmitting coil. The second transmitting coil is the transmitting coil closest to the first transmitting coil on the movement path of the first transmitting coil. The wireless charging system can move the first transmitting coil and the second transmitting coil synchronously. In a possible implementation, the wireless charging system can control the alignment module to drive the first transmitting coil to move at a first speed in the first direction, such as the 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 in the first direction away from the corrected position of the wireless charging receiving circuit at a second speed, where the second speed is greater than the first speed.

Step S1010: Perform wireless charging on the wireless charging receiving circuit.

The wireless charging system can control the first transmitting coil to wirelessly charge the wireless charging receiving circuit and start the wireless charging process of the transmitting coil. The wireless charging process of each transmitting coil can include foreign object detection, in-band communication, charging control and other links. Each link in the wireless charging process of the transmitting coil is independent of each other and can be executed in parallel. Optionally, after the transmitting coil ends the wireless charging process, it can be moved to the initial position driven by the alignment mechanism. The initial position of each transmit coil is preconfigured.

Optionally, after step S1010, the wireless charging system can also determine whether there is a fault in the system, and if there is a fault, protect the system by reducing the rated power, shutting down, etc. If there is no fault, the wireless charging system can perform the operations in the above steps again.

Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the protection scope of the present application. In this way, if these modifications and variations of the present application fall within the scope of the claims of the present application and equivalent technologies, the present application is also intended to include these modifications and variations.

Claims

A wireless charging device, the surface of which is used as a charging plane for placing at least one electronic device, said at least one electronic device including one or more of a near field communication circuit or a wireless charging receiving circuit, characterized by The wireless charging device includes a detection coil array, the detection coil array includes a plurality of detection areas, the multiple detection areas respectively correspond to multiple charging areas of the charging plane, and the multiple detection areas are respectively used to Detecting the signal type of the signal emitted by the at least one electronic device placed on the charging plane, wherein,

The wireless charging device is configured to adjust the power of wireless charging to the at least one electronic device in response to the signal type detected by at least one of the detection areas.
The wireless charging device according to claim 1, characterized in that the wireless charging device is used for:

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

In response to the signal type detected by at least one of the detection areas including a wireless charging type signal and not including a near field communication type signal, the wireless charging device adjusts the power of wireless charging to the at least one electronic device to be greater than the preset value. Limit value.
The wireless charging device according to any one of claims 1 to 3, characterized in that the detection coil array is used to detect at least one of near field communication type signals and wireless charging type signals, wherein:

The near field communication type signal includes one or more of a resonance signal generated by a receiving coil in a near field communication circuit and a communication signal generated by a near field communication circuit; and

The wireless charging type signal includes one or more of a resonance signal generated by a receiving coil in the wireless charging receiving circuit and a communication signal generated by the wireless charging receiving circuit.
The wireless charging device according to any one of claims 1 to 4, characterized in that the wireless charging device includes a transmitting coil and an alignment mechanism, the alignment mechanism is used to move the transmitting coil, and the plurality of detection The areas are respectively used to detect the signal strength of the wireless charging type signal emitted by the at least one electronic device, and the alignment mechanism is used to:

The transmitting coil is moved to a target area, where the target area includes a partial area among the plurality of detection areas, and the partial area is determined according to the signal strength of the wireless charging type signal detected by at least one of the detection areas.
The wireless charging device according to any one of claims 1 to 5, wherein the plurality of detection areas are respectively used to detect the signal strength of the near field communication type signal emitted by the at least one electronic device, and the wireless charging Equipment used for:

The wireless charging power of the transmitting coil in a limited area is controlled to be less than or equal to the preset limited value, the limited area includes a charging area corresponding to a partial detection area determined from the plurality of detection areas, and the The determined partial detection area is determined from the plurality of detection areas based on the signal strength of a near field communication type signal detected by at least one of the detection areas.
The wireless charging device according to any one of claims 1 to 6, wherein the detection coil array includes:

A plurality of first detection coils provided on a printed circuit board, the plurality of first detection coils are arranged along a first direction, and two adjacent first detection coils among the plurality of first detection coils partially overlap;

A plurality of second detection coils provided on the printed circuit board, the plurality of second detection coils are arranged along the second direction, and two adjacent second detection coils among the plurality of second detection coils partially overlap. , the second direction is not parallel to the first direction;

Wherein, the printed circuit board is parallel to the charging plane, and the projection of the plurality of first detection coils on the charging plane at least partially overlaps with the projection of the plurality of second detection coils on the charging plane, The overlapping portion of a projection of the first detection coil on the charging plane and a projection of the second detection coil on the charging plane forms a detection area.
The wireless charging device according to claim 7, wherein the detection area is used to detect a wireless charging type signal or a near field communication type signal according to at least one of the first detection coil or the second detection coil. , determine the type of signal detected.
The wireless charging device according to claim 8, wherein the detection coil array is used for:

According to the signal strength of the wireless charging type signals detected by the plurality of first detection coils and the signal strength of the wireless charging type signals detected by the plurality of second detection coils, it is determined that the charging area corresponding to a detection area is placed with wireless charging receiving circuit.
The wireless charging device according to claim 9, wherein the target area includes one or more adjacent first detection coils and one or more adjacent second detection coils. The charging area corresponding to the detection area, where:

The one or more adjacent first detection coils are determined based on a comparison result between the signal strength of the wireless charging type signal detected by the multiple first detection coils and a first threshold. The two detection coils are determined based on a comparison result between the signal strength of the wireless charging type signals detected by the plurality of second detection coils and the first threshold.
The wireless charging device according to claim 8, wherein the detection coil array is used for:

According to the signal strength of the near field communication type signals detected by the plurality of first detection coils and the signal strength of the near field communication type signals detected by the plurality of second detection coils, one or more of the detection areas corresponding to Near field communication circuits are placed in the charging area.
The wireless charging device according to claim 11, wherein the defined area includes one or more adjacent first detection coils and one or more adjacent second detection coils. The charging area corresponding to the detection area, where:

The one or more adjacent first detection coils are determined based on a comparison result between 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 first detection coils are The second detection coil is determined based on a comparison result between the signal strength of the near field communication type signals detected by the plurality of second detection coils and the second threshold.
A wireless charging system, characterized in that it includes a plurality of wireless charging devices according to any one of claims 1-12, the surface of the wireless charging system is used as a charging plane for placing at least one electronic device, the wireless charging The charging plane of the system is formed by a combination of the charging planes of the plurality of wireless charging devices.