Wireless charging device, system and wireless charging deviation detection method

Abstract

The present disclosure provides a wireless charging device, system and wireless charging misalignment detection method, which relate to the field of wireless charging technology. The wireless charging device includes: a transmitting coil, which is used to convert alternating current into a first electromagnetic signal and emit it to wirelessly charge an electronic device; at least two detection coils, which are respectively arranged around the transmitting coil and are located in the same plane as the transmitting coil, and are used to respectively emit a second electromagnetic signal; a control module, which is respectively connected to the at least two detection coils, and is used to respectively detect each voltage peak value of the voltage waveform of the at least two detection coils after detecting that the voltage waveform of the second electromagnetic signal emitted by the at least two detection coils becomes continuous, and determine whether there is a misalignment between the transmitting coil and the receiving coil in the electronic device according to each voltage peak value.

Description

Technical Field

[0001] The present disclosure relates to the technical field of wireless charging, and in particular to a wireless charging device, system and wireless charging misalignment detection method. Background Art

[0002] With the popularization of wireless charging technology, more and more electronic devices (such as smart phones, tablet computers, etc.) support wireless charging function.

[0003] During the wireless charging process, a power adapter is generally connected to a wireless charging base, and the output power of the power adapter is transmitted to the electronic device in a wireless manner (such as electromagnetic signals or electromagnetic waves) through the wireless charging base to wirelessly charge the electronic device.

[0004] However, during the wireless charging process, if the position between the electronic device and the wireless charging base is offset, the efficiency of energy transmission will be reduced, and the wireless charging base will provide insufficient energy to the electronic device. In addition, high-power charging is not possible in the offset state.

[0005] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present disclosure, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

[0006] The purpose of the present disclosure is to provide a wireless charging device, system and wireless charging misalignment detection method.

[0007] Other features and advantages of the present disclosure will become apparent from the following detailed description, or may be learned in part by the practice of the present disclosure.

[0008] According to one aspect of the present disclosure, there is provided a wireless charging device, comprising: a transmitting coil, for converting alternating current into a first electromagnetic signal and transmitting it for wireless charging of an electronic device; at least two detecting coils, respectively arranged around the transmitting coil and located in the same plane as the transmitting coil, for respectively transmitting a second electromagnetic signal; a control module, respectively connected to the at least two detecting coils, for respectively detecting each voltage peak value of the voltage waveform of the at least two detecting coils after detecting that the voltage waveform of the second electromagnetic signal transmitted by the at least two detecting coils becomes continuous, and determining whether a misalignment occurs between the transmitting coil and a receiving coil in the electronic device according to each of the voltage peak values.

[0009] According to one embodiment of the present invention, the control module is also used to determine the position information of the receiving coil relative to the transmitting coil based on the corresponding relationship between each of the voltage peaks and the preset voltage value and the distance when it is determined that there is a misalignment between the transmitting coil and the receiving coil; and send the position information to the electronic device.

[0010] According to an embodiment of the present invention, the wireless charging device further includes: a communication module connected to the control module; the control module is used to send the location information to the electronic device through the communication module.

[0011] According to an embodiment of the present invention, the control module is used to send the position information to the electronic device via the transmitting coil and / or the at least two detecting coils.

[0012] According to an embodiment of the present invention, the position information includes: information about the direction of the electronic device to be adjusted.

[0013] According to an embodiment of the present invention, the control module is used to determine that a misalignment occurs between the transmitting coil and the receiving coil when one or more voltage peaks among the voltage peaks are greater than or equal to a voltage threshold.

[0014] According to one embodiment of the present invention, the control module includes: a voltage sampling unit and a processing unit; the voltage sampling unit is used to perform analog / digital conversion on the voltage of the second electromagnetic signal of the at least two detection coils, and sample the converted voltage to obtain the voltage peak values ​​of the at least two detection coils respectively; the processing unit is used to determine whether there is a misalignment between the transmitting coil and the receiving coil based on each voltage peak value.

[0015] According to one embodiment of the present invention, the processing unit is further used to determine the position information of the receiving coil relative to the transmitting coil based on the correspondence between each of the voltage peaks and the preset voltage peak and distance; and send the position information to the electronic device.

[0016] According to an embodiment of the present invention, the processing unit is used to determine that a misalignment occurs between the transmitting coil and the receiving coil when one or more voltage peaks among the voltage peaks are greater than or equal to a voltage threshold.

[0017] According to one embodiment of the present invention, the wireless charging device also includes: a switch, which is respectively connected to the control module and the at least two detection coils; the control module is used to control the switch to turn off when it is determined that there is no more displacement between the transmitting coil and the receiving coil, so that the at least two detection coils stop sending the second electromagnetic signal.

[0018] According to an embodiment of the present invention, the second electromagnetic signal includes: a pulse signal emitted in the initial stage of QI wireless charging.

[0019] According to an embodiment of the present invention, the at least two detection coils include: four detection coils, which are respectively arranged around the transmitting coil.

[0020] According to another aspect of the present invention, a wireless charging system is provided, comprising: any one of the wireless charging devices described above and an electronic device.

[0021] According to another aspect of the present invention, there is provided a wireless charging misalignment detection method, which is applied to a wireless charging device, comprising: after detecting that the voltage waveform of an electromagnetic signal emitted by at least two detection coils in the wireless charging device becomes continuous, respectively detecting each voltage peak value of the voltage waveform of the at least two detection coils; and determining whether a misalignment occurs between the transmitting coil in the wireless charging device and the receiving coil in the electronic device based on each of the voltage peak values.

[0022] According to one embodiment of the present invention, the method further includes: when it is determined that there is a misalignment between the transmitting coil and the receiving coil, determining the position information of the receiving coil relative to the transmitting coil based on the correspondence between each of the voltage peaks and the preset voltage value and the distance; and sending the position information to the electronic device.

[0023] According to an embodiment of the present invention, sending the position information to the electronic device includes: sending the position information to the electronic device via a communication module in the wireless charging device.

[0024] According to an embodiment of the present invention, sending the position information to the electronic device includes: sending the position information to the electronic device via the transmitting coil and / or the at least two detecting coils.

[0025] According to an embodiment of the present invention, the position information includes: information about the direction of the electronic device to be adjusted.

[0026] According to one embodiment of the present invention, determining whether a misalignment occurs between a transmitting coil in the wireless charging device and a receiving coil in the electronic device based on each of the voltage peaks includes: determining that a misalignment occurs between the transmitting coil and the receiving coil when one or more of the voltage peaks is greater than or equal to a voltage threshold.

[0027] According to one embodiment of the present invention, each voltage peak value of the voltage waveform of the at least two detection coils is detected respectively, including: performing analog / digital conversion on the voltage of the electromagnetic signal of the at least two detection coils respectively, and sampling the converted voltage to obtain each voltage peak value of the at least two detection coils respectively.

[0028] According to an embodiment of the present invention, the method further includes: when it is determined that there is no more misalignment between the transmitting coil and the receiving coil, controlling a switch in the wireless charging device to turn off so that the at least two detection coils stop sending the electromagnetic signal.

[0029] According to the wireless charging device provided by the embodiment of the present disclosure, by setting at least two detection coils, when it is detected that the waveform of the electromagnetic signal emitted by each detection coil becomes continuous, it is determined whether there is a misalignment between the transmitting coil in the wireless charging device and the receiving coil in the electronic device according to the detected voltage peak value of each detection coil. Compared with the method in the related art in which the electronic device determines whether there is a misalignment by detecting the change of the AC waveform on its own receiving coil and / or the difference in the voltage amplitude after rectification, even when the deviation distance between the transmitting coil and the receiving coil is small, the wireless charging device provided by the embodiment of the present disclosure can detect the misalignment between the two, effectively improving the accuracy of the misalignment detection, thereby avoiding the situation in which the wireless charging device still charges at a high power in the case of misalignment, resulting in low charging efficiency and heating of the electronic device.

[0030] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings herein are incorporated into the specification and constitute a part of the specification, illustrate embodiments consistent with the present disclosure, and together with the specification are used to explain the principles of the present disclosure. Obviously, the accompanying drawings described below are only some embodiments of the present disclosure, and for ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without creative work.

[0032] Figure 1 It is a structural schematic diagram of a wireless charging system according to an exemplary embodiment of the present disclosure.

[0033] Figure 2A is a schematic diagram of two detection coils according to an example.

[0034] Figure 2B is a schematic diagram of three detection coils according to an example.

[0035] Figure 2Cis a schematic diagram of four detection coils according to an example.

[0036] Figure 3A is a schematic diagram of another wireless charging device according to an exemplary embodiment.

[0037] Figure 3B is a schematic diagram of yet another wireless charging device according to an exemplary embodiment.

[0038] Figure 4 is a schematic diagram of the control module 103 according to an exemplary embodiment.

[0039] Figure 5 A flow chart of a wireless deviation detection method in an embodiment of the present disclosure is shown.

[0040] Figure 6 The figure is a flow chart of another wireless deviation detection method according to an exemplary embodiment. DETAILED DESCRIPTION

[0041] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that the disclosure will be more comprehensive and complete and to fully convey the concepts of the example embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0042] In addition, the accompanying drawings are only schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same reference numerals in the figures represent the same or similar parts, and their repeated description will be omitted. Some of the block diagrams shown in the accompanying drawings are functional entities and do not necessarily correspond to physically or logically independent entities. These functional entities can be implemented in software form, or implemented in one or more hardware modules or integrated circuits, or implemented in different networks and / or processor devices and / or microcontroller devices.

[0043] In the present disclosure, unless otherwise expressly specified and limited, a first feature being “above” or “below” a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being “above”, “above”, and “above” a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0044] In this disclosure, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be an electrical connection or a communication connection; it can be a direct connection or an indirect connection. For ordinary technicians in this field, the specific meanings of the above terms in this disclosure can be understood according to specific circumstances.

[0045] In addition, in the description of the present disclosure, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically limited. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist, such as A and / or B, which can indicate the existence of A alone, B alone, and the simultaneous existence of A and B. The symbol " / " generally indicates that the objects associated before and after are in an "or" relationship. The terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0046] During wireless charging, the efficiency of energy transmission can be maximized only when the center of the transmitting coil is aligned with the center of the receiving coil, or the position deviation between the two is within a small range (such as 1mm to 2mm).

[0047] In the related art, it is usually detected whether the transmitting coil and the receiving coil are in a misaligned state by detecting the change in the current waveform of the alternating current on the receiving coil and the difference in the voltage amplitude after rectification. This detection method cannot detect the situation where the position deviation between the transmitting coil and the receiving coil is small, resulting in the wireless charging base still charging the electronic device at high power, which is inefficient and causes the electronic device to heat up.

[0048] In addition, even if this detection method can detect the misalignment between the transmitting coil and the receiving coil, it cannot detect the direction of the misalignment and the distance of the misalignment, and therefore cannot prompt the user how to make adjustments.

[0049] The embodiments of the present disclosure provide a wireless charging device, a wireless charging system and a wireless charging misalignment detection method, which can accurately detect the misalignment between a transmitting coil and a receiving coil when the position deviation between the two is small, thereby improving the accuracy of misalignment detection.

[0050] Hereinafter, the wireless charging device, the wireless charging system and the wireless charging deviation detection method in the exemplary embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings and embodiments.

[0051] Figure 1 It is a structural schematic diagram of a wireless charging system according to an exemplary embodiment of the present disclosure.

[0052] refer to Figure 1 The wireless charging system 1 includes: a wireless charging device 10, a power supply device 11 and an electronic device 12.

[0053] The power supply device 11 may be, for example, a power adapter, a mobile power bank, etc. The wireless charging device 10 may be, for example, a wireless charging base.

[0054] After the power supply device 11 is connected to the wireless charging device 10 through a cable, the output current is transmitted to the wireless charging device 10 , and the wireless charging device 10 converts the electric energy provided by the power supply device 11 into an electromagnetic signal and sends it to the electronic device 12 to wirelessly charge the electronic device 12 .

[0055] The electronic device 12 can be, for example, a terminal or an electronic device, which can be a mobile terminal such as a mobile phone, a game console, a tablet computer, an e-book reader, a smart wearable device, an MP4 (Moving Picture Experts Group Audio Layer IV) player, a smart home device, an AR (Augmented Reality) device, a VR (Virtual Reality) device, etc., or a rechargeable electronic device with a charging function such as a mobile power supply (such as a power bank, a travel charger), an electronic cigarette, a wireless mouse, a wireless keyboard, a wireless headset, a Bluetooth speaker, or a personal computer (PC), such as a laptop computer and a desktop computer.

[0056] The electronic device 12 includes a wireless receiving circuit 121 , a voltage conversion circuit 122 , a battery 123 and a control module 124 .

[0057] The wireless receiving circuit 121 is used to receive the electromagnetic signal (or electromagnetic wave) transmitted by the wireless transmitting circuit 101 in the wireless charging device 10, and convert the electromagnetic signal (or electromagnetic wave) into direct current output by the wireless receiving circuit 121. For example, the wireless receiving circuit 121 may include: a receiving coil 1211 and a shaping circuit 1212 connected to the receiving coil 1211, including a rectifying circuit and / or a filtering circuit. The wireless receiving circuit 121 converts the electromagnetic signal (or electromagnetic wave) transmitted by the wireless transmitting circuit 101 into alternating current through the receiving coil 1211, and performs rectification and / or filtering operations on the alternating current through the shaping circuit 1212, thereby converting the alternating current into stable direct current to charge the battery 123.

[0058] It should be noted that the embodiment of the present disclosure does not specifically limit the specific form of the shaping circuit and the form of the output voltage and output current of the wireless receiving circuit 121 obtained after shaping by the shaping circuit.

[0059] In some embodiments, the shaping circuit 1212 may include: a rectifying circuit and a filtering circuit. The output voltage of the wireless receiving circuit 121 may be a stable voltage obtained after filtering.

[0060] In some embodiments, the shaping circuit 1212 may include: a rectifier circuit. The output voltage of the wireless receiving circuit 121 may be a voltage of a pulsating waveform obtained after rectification, and the voltage of the pulsating waveform is directly loaded to both ends of the battery 123 to charge the battery 123.

[0061] When the output voltage of the wireless receiving circuit 121 cannot meet the expected charging voltage requirement of the battery 123, and / or the output current of the wireless receiving circuit 121 cannot meet the expected charging current requirement of the battery 123, the voltage conversion circuit 122 can be used to convert the expected charging voltage and / or charging current of the battery 123.

[0062] The battery 123 may include a single cell or multiple cells. When the battery 123 includes multiple cells, the multiple cells may be connected in series. Thus, the charging voltage that the battery 123 can withstand is the sum of the charging voltages that the multiple cells can withstand, which can increase the charging speed and reduce the heating during charging.

[0063] The control module 124 may be implemented, for example, by an independent micro control unit (MCU), or may also be implemented by an application processor (AP) inside the electronic device 12 .

[0064] The control module 124 is used to communicate with the control module 103 in the wireless charging device 10, and feed back information such as the detected charging voltage value and / or charging current value, the remaining power of the battery 123 or the preset full charge time to the wireless charging device 10. In addition, error information and termination transmission information can also be fed back to the control module 103; in addition, the feedback information can also include voltage and / or current adjustment instructions determined by the electronic device 12 based on the detected charging voltage value and / or charging current value, the remaining power or the preset full charge time.

[0065] The wireless charging device 10 includes: a wireless transmitting circuit 101 , at least two detection coils 102 , a control module 103 and a charging interface 104 .

[0066] The charging interface 104 may be, for example, a USB interface that meets the USB 2.0 specification, USB 3.0 specification, and USB 3.1 specification, including: a Micro USB interface or a USB TYPE-C interface. In some embodiments, the charging interface 104 may also be a lightning interface, or any other type of parallel or serial port that can be used for charging.

[0067] The wireless transmitting circuit 101 is connected to the power supply device 11 through the charging interface 104, and is used to convert the power provided by the power supply device 11 into an electromagnetic signal (or electromagnetic wave) for transmission, so as to wirelessly charge the electronic device 12. For example, as shown in the figure, the wireless transmitting circuit 101 includes: an inverse rectifier circuit 1011 and a transmitting coil 1012.

[0068] The inverse rectifier circuit 1011 is connected to the charging interface 104 and is used to convert the direct current provided by the power supply device 11 into high-frequency alternating current.

[0069] The transmitting coil 1012 is connected to the inverse rectifying circuit 1011 and is used to convert the high-frequency alternating current output by the inverse rectifying circuit 1011 into an electromagnetic signal (or electromagnetic wave) and transmit it to wirelessly charge the electronic device 12 .

[0070] At least two detection coils 102 are respectively disposed around the transmitting coil 1012 and are located in the same plane as the transmitting coil 1012 .

[0071] In some embodiments, in order to avoid mutual interference between the detection coil 102 and the transmitting coil 1012, each detection coil 102 can be insulated from the transmitting coil 1012. It should be noted that although two detection coils (detection coil 102A and detection coil 102B) are used as an example in the figure, this is not intended to limit the present disclosure. In actual applications, the number of detection coils can be set according to needs. For example, Figure 2B As shown, including three detection coils; or as Figure 2C As shown, four detection coils are provided.

[0072] by Figure 1 Taking the two detection coils in the example, the detection coil 102A and the detection coil 102B respectively emit electromagnetic signals after being powered on, such as after being connected to the power supply device 11.

[0073] Taking the QI wireless charging protocol as an example, the electromagnetic signal may be a pulse signal emitted at the beginning of wireless charging (such as the Ping stage), but the present disclosure is not limited thereto and may also be other detection signals.

[0074] Taking the wireless charging device 10 as a wireless charging base as an example, when the electronic device 12 is placed on the wireless charging device 10, the transmitting coil 1211 therein establishes connections with the detection coil 102A and the detection coil 102B respectively, so that the waveform of the electromagnetic signal emitted by the detection coil 102A and the detection coil 102B becomes a continuous waveform (such as a sine waveform).

[0075] The control module 103 may be implemented as an MCU, for example.

[0076] The control module 103 is connected to the detection coil 102A and the detection coil 102B in the figure respectively. After detecting that the voltage waveform of the electromagnetic signal emitted by the detection coil 102A and the detection coil 102B becomes continuous, the control module 103 detects the voltage peaks of the voltage waveform of the detection coil 102A and the detection coil 102B respectively, and determines whether there is a misalignment between the transmitting coil 1012 and the receiving coil 1211 in the electronic device 12 according to the voltage peaks.

[0077] In some embodiments, when it is determined that there is a misalignment between the transmitting coil 1012 and the receiving coil 1211 , the electronic device 12 may also be notified, so that the user is notified through the electronic device 12 to adjust the positional relationship between the two.

[0078] Each voltage peak detected on the detection coil is related to the relative position of the receiving coil 1211. The closer the distance between the two is, the higher the voltage peak is. In some embodiments, when the control module 103 detects that one or more of the voltage peaks is greater than or equal to a preset voltage threshold, it is determined that there is a misalignment between the transmitting coil 1012 and the receiving coil 1211.

[0079] Figure 2A is a schematic diagram of two detection coils according to an example. Figure 2B is a schematic diagram of three detection coils according to an example. Figure 2C is a schematic diagram of four detection coils according to an example.

[0080] When a user places the electronic device 12 on the wireless charging device 10 for wireless charging, Figure 2A As shown, if the receiving coil 1211 deviates from the transmitting coil 1012 and is close to the detecting coil 102A, the voltage peak detected on the detecting coil 102A is higher than the voltage peak detected on the detecting coil 102B. When it is detected that the voltage peak on the detecting coil 102A is greater than or equal to the voltage threshold, it is determined that the transmitting coil 1012 and the receiving coil 1211 are offset.

[0081] Or, if Figure 2BAs shown, if the receiving coil 1211 deviates from the transmitting coil 1012 and is close to the detecting coil 102A, the voltage peak value detected on the detecting coil 102A is higher than the voltage peak value detected on the detecting coil 102B and the voltage value detected on the detecting coil 102C. When it is detected that the voltage peak value on the detecting coil 102A is greater than or equal to the voltage threshold, it is determined that the transmitting coil 1012 and the receiving coil 1211 are offset.

[0082] Or, if Figure 2C As shown, if the receiving coil 1211 deviates from the transmitting coil 1012 and is close to the detecting coil 102A and the detecting coil 102B, the voltage peak detected on the detecting coil 102A and the voltage peak detected on the detecting coil 102B are both higher than the voltage peak detected on the detecting coil 102C and the voltage peak detected on the detecting coil 102D. When it is detected that the voltage peak on the detecting coil 102A and / or the voltage peak on the detecting coil 102B is greater than or equal to the voltage threshold, it is determined that the transmitting coil 1012 and the receiving coil 1211 are offset.

[0083] It should be noted that, although the transmitting coil and the detecting coil in the figure are both elliptical in shape, the present disclosure is not limited thereto, and for example, they may also be set to be circular, etc.

[0084] According to the wireless charging device provided by the embodiment of the present disclosure, by setting at least two detection coils, when it is detected that the waveform of the electromagnetic signal emitted by each detection coil becomes continuous, it is determined whether there is a misalignment between the transmitting coil in the wireless charging device and the receiving coil in the electronic device according to the detected voltage peak value of each detection coil. Compared with the method in the related art in which the electronic device determines whether there is a misalignment by detecting the change of the AC waveform on its own receiving coil and / or the difference in the voltage amplitude after rectification, even when the deviation distance between the transmitting coil and the receiving coil is small, the wireless charging device provided by the embodiment of the present disclosure can detect the misalignment between the two, effectively improving the accuracy of the misalignment detection, thereby avoiding the situation in which the wireless charging device still charges at a high power in the case of misalignment, resulting in low charging efficiency and heating of the electronic device.

[0085] In some embodiments, the control module 103 is further used to determine the position information of the receiving coil 1211 relative to the transmitting coil 1012 according to the correspondence between each voltage peak value and the preset voltage value and the distance when it is determined that there is a misalignment between the transmitting coil 1012 and the receiving coil 1211.

[0086] Figure 2CTaking the example that the distances between each detection coil and the transmitting coil 1012 are equal, for example, the distances between the centers O1-1 to O1-4 of each detection coil and the center O2 of the transmitting coil 1012 are all equal, then the correspondence between the preset voltage value and the distance can be applied to any detection coil. According to the voltage values ​​of the induced voltages detected on the detection coils 102A, 102B, 102C, and 102D, the correspondence between the preset voltage value and the distance is queried, and the distances between the receiving coil 1211 and each detection coil can be determined respectively, for example, the distance between the center O3 of the receiving coil 1211 and the centers O1-1 to O1-4 of each detection coil is determined, thereby determining the position information of the receiving coil 1211 relative to the transmitting coil 1012. For example, if an XY axis coordinate system is established with the center O2 of the transmitting coil 1012 as the origin, the coordinates (i.e., positions) of the centers O1-1 to O1-4 of each detecting coil in the coordinate system are determined. Then, based on the distances of the center O3 of the receiving coil 1211 from the centers O1-1 to O1-4 obtained, the coordinates of the center O3 of the receiving coil 1211 can be calculated.

[0087] It should be noted that the above-mentioned establishment of a plane rectangular coordinate system with the position of the transmitting coil 1012 as the origin and determining the position information of the receiving coil 1211 relative to the transmitting coil 1012 by calculating the coordinates of the receiving coil 1211 is only an example and does not limit the present disclosure. In practical applications, after obtaining the distance between the receiving coil 1211 and each detection coil, the relative position information between the receiving coil 1211 and the transmitting coil 1012 can also be determined according to other methods.

[0088] In some embodiments, the control module 103 is further configured to send the above-mentioned position information to the electronic device 12 (such as to the control module 124 in the electronic device 12), so that the electronic device 12 can instruct the user to adjust the position of the electronic device 12 on the wireless charging device 10 according to the position information. For example, the electronic device 12 can remind the user to adjust the position of the electronic device 12 on the wireless charging device 10 by displaying it on the display screen.

[0089] It should be understood that in order for the electronic device 12 to determine the adjustment direction of the electronic device 12 based on the position information, for example, when the direction is forward, backward, left or right when indicating to the user, it is necessary to determine the direction of each detection coil relative to the transmitting coil 1012, whether it is in front of, behind, left or right of the transmitting coil.

[0090] The control module 103 and the control module 124 can communicate wirelessly. For example, the control module 103 can couple the above-mentioned location information to the transmitting coil 1012 and / or each detection coil of the wireless transmitting circuit 101 to send it to the receiving coil 1211 of the wireless receiving circuit 121 of the electronic device 12, and then the receiving coil 1211 of the wireless receiving circuit 121 of the electronic device 12 is decoupled to obtain the location information.

[0091] Alternatively, the electronic device 12 may also communicate with the wireless charging device 10 via at least one of Bluetooth, WiFi, mobile cellular network communication (such as 2G, 3G, 4G or 5G), wireless communication (such as lEEE 802.11, 802.15 (WPANs), 802.16 (WiMAX), 802.20, etc.), short-range wireless communication based on high-frequency antennas (such as 60GHz), optical communication (such as infrared communication), ultrasonic communication, ultra-wideband (UMB) communication, etc. It is understandable that when communicating via the above communication methods, the electronic device 12 and the wireless charging device 10 also include corresponding communication modules (such as Figure 3A The communication module 105 shown in the figure may include a Bluetooth communication module, a WiFi communication module, a 2G / 3G / 4G / 5G mobile communication module, a high-frequency antenna, and an optical communication module. At least one of an ultrasonic communication module, an ultra-wideband communication module, and the like. It should be understood that the standards that may be adopted for the above-mentioned wireless communication include previous and existing standards, and, without departing from the scope of the present disclosure, also include future versions and future standards that adopt these standards. By communicating through the above-mentioned wireless communication method, the reliability of communication can be improved, thereby improving the charging safety. Compared with the method of coupling feedback information to the receiving coil 1211 of the wireless receiving circuit 121 by signal modulation in the related art (for example, the Qi standard), the reliability of communication can be improved, and the voltage ripple caused by the communication using the signal coupling method can be avoided, which affects the voltage processing process of the voltage conversion module 122 of the electronic device 12. In addition, for the voltage ripple at the output of the wireless receiving coil 1211, if the ripple is not effectively processed, it may cause wireless charging safety problems, and there are certain safety hazards. By communicating via the wireless communication method described above, voltage ripples can be eliminated, thereby eliminating the circuit for processing voltage ripples, reducing the complexity of the charging circuit of the electronic device 12, improving charging efficiency, saving circuit setting space, and reducing costs.

[0092] In addition, in some embodiments, the above-mentioned position information may also include information about the direction to be adjusted of the electronic device 12. That is, the wireless charging device 10 determines the adjustment direction of the electronic device 12 according to the above-mentioned position information.

[0093] Still Figure 2CFor example, according to the determined position information, it can be found that the position of the electronic device 12 on the wireless charging device 10 is biased towards the detection coils 102A and 102B, and the electronic device 12 needs to be adjusted in the opposite direction to the detection coils 102A and 102B.

[0094] Similarly, it should be understood that in order to clearly adjust the direction, for example, when the direction is forward, backward, left or right when instructing the user, it is necessary to determine the direction of each detection coil relative to the transmitting coil 1012, whether it is in front of, behind, left or right of the transmitting coil.

[0095] According to the wireless charging device provided by the embodiment of the present disclosure, further, the position information of the receiving coil relative to the transmitting coil in the electronic device can be determined according to the voltage peak value detected on each sensing coil. The wireless charging device can determine the adjustment direction of the electronic device's position according to the position information, and send the adjustment direction to the electronic device to remind the user to adjust the position of the electronic device through the electronic device; or the position information can be directly sent to the electronic device so that the electronic device determines its adjustment direction according to the position information, thereby prompting the user to adjust the position of the electronic device.

[0096] Figure 3A is a schematic diagram of another wireless charging device according to an exemplary embodiment. Figure 3B is a schematic diagram of yet another wireless charging device according to an exemplary embodiment. Figure 3A and Figure 3B In the figure, two detection coils 102A and 102B are still taken as examples.

[0097] and Figure 1 The wireless charging device shown in is different from Figure 3A The wireless charging device 10A shown further includes the above-mentioned communication module 105 so as to communicate with the electronic device 12 through the communication module 105 .

[0098] Figure 3B The wireless charging device 10B shown further includes a switch 106, which is connected to the control module 103 and the detection coil 102A and the detection coil 102B respectively. When the control module 103 determines that there is no more displacement between the transmitting coil 1022 and the receiving coil 1211, the switch 106 is controlled to be turned off so that the detection coil 102A and the detection coil 102B stop sending electromagnetic signals.

[0099] Need to explain, Figure 3B Although it is taken as an example that one switch 106 is provided to control a plurality of detection coils at the same time, one switch may also be provided for each detection coil.

[0100] In addition, in some embodiments, if the user has not adjusted the position of the electronic device, the control module 103 can also set a timer, and after the timer times out, turn off the switch 106, so that each detection coil no longer sends an electromagnetic signal. Because the offset is not adjusted, the transmission power is reduced to avoid the situation where the electronic device is still transmitting at a high power in the offset state, causing the electronic device to heat up.

[0101] Figure 4 is a schematic diagram of the control module 103 according to an exemplary embodiment.

[0102] like Figure 4 As shown, the control module 103 may further include: a voltage sampling unit 1031 and a processing unit 1032 .

[0103] The voltage adopting unit 1031 is used to perform analog / digital conversion (ADC) on the voltage of the electromagnetic signal emitted by each detection coil, and to sample the converted voltage (such as a sine wave voltage waveform) to obtain the voltage peak value on each detection coil. The voltage peak value is related to the distance between the detection coil and the receiving coil 1211. The closer the distance, the higher the voltage peak value.

[0104] The processing unit 1032 is used to determine whether there is a misalignment between the transmitting coil 1012 and the receiving coil 1211 according to each voltage peak value.

[0105] For example, as described above, the processing unit 1032 is configured to determine that a misalignment occurs between the transmitting coil 1012 and the receiving coil 1211 when one or more voltage peaks among the voltage peaks is greater than or equal to a voltage threshold.

[0106] In addition, the processing unit 1032 may also be configured to determine the position information of the receiving coil 1211 relative to the transmitting coil 1012 according to the corresponding relationship between each voltage peak value and a preset voltage peak value and a distance.

[0107] The specific location information is as described above and will not be repeated here.

[0108] The following is an embodiment of the method disclosed herein, which can be applied to the above-mentioned embodiment of the device disclosed herein. For details not disclosed in the embodiment of the method disclosed herein, please refer to the embodiment of the device disclosed herein.

[0109] Figure 5 FIG. 2 is a flow chart of a wireless deviation detection method according to an embodiment of the present disclosure. Figure 5 The wireless deviation detection method shown can be applied to the wireless charging device 10 described above and executed by the control module 103 in the wireless charging device 10 .

[0110] refer to Figure 5, the wireless deviation detection method 20 comprises:

[0111] In step S202, after detecting that the voltage waveforms of the electromagnetic signals emitted by at least two detection coils in the wireless charging device become continuous, the voltage peaks of the voltage waveform induced voltages on at least two induction coil detection coils in the wireless charging device are detected respectively.

[0112] In step S204, it is determined whether there is a misalignment between the transmitting coil in the wireless charging device and the receiving coil in the electronic device according to each voltage peak value.

[0113] In some embodiments, step S204 may further include: when one or more voltage peaks among the voltage peaks are greater than or equal to a voltage threshold, determining that a misalignment occurs between the transmitting coil and the receiving coil.

[0114] In some embodiments, step S202 may further include: performing analog / digital conversion on the voltage of the induced electromagnetic signal on at least two induction coil detection coils, and sampling the converted induced voltage to obtain voltage peaks of the induced voltage on at least two induction coil detection coils.

[0115] According to the wireless offset detection method provided by the embodiment of the present disclosure, when it is detected that the waveform of the electromagnetic signal emitted by each detection coil becomes continuous, it is determined whether there is an offset between the transmitting coil in the wireless charging device and the receiving coil in the electronic device according to the voltage peak value detected on each detection coil. Compared with the method in the related art in which the electronic device determines whether an offset occurs by detecting the change of the AC waveform on its own receiving coil and / or the difference in the voltage amplitude after rectification, even when the deviation distance between the transmitting coil and the receiving coil is small, the wireless offset detection method provided by the embodiment of the present disclosure can detect the offset between the two, effectively improving the accuracy of the offset detection, thereby avoiding the situation in which the wireless charging device is still charged at high power in the case of offset, resulting in low charging efficiency and heating of the electronic device.

[0116] Figure 6 The figure is a flow chart of another wireless deviation detection method according to an exemplary embodiment.

[0117] refer to Figure 6 The wireless deviation detection method 30 may further include:

[0118] In step S302, when it is determined that there is a misalignment between the transmitting coil and the receiving coil, the position information of the receiving coil relative to the transmitting coil is determined according to the corresponding relationship between each voltage peak value and the preset voltage value and the distance.

[0119] In step S304, the location information is sent to the electronic device.

[0120] In some embodiments, the location information includes: information about the direction of the electronic device to be adjusted.

[0121] In some embodiments, step S304 may include, for example: sending the location information to the electronic device via a communication module in the wireless charging device.

[0122] In some embodiments, step S304 may include, for example: sending the location information to the electronic device via a transmitting coil and / or at least two detecting coils.

[0123] In some embodiments, method 30 may further include: in step S306, when it is determined that there is no more misalignment between the transmitting coil and the receiving coil, controlling the switch in the wireless charging device to turn off so that at least two detection coils stop sending electromagnetic signals.

[0124] According to the wireless deviation detection method provided by the embodiment of the present disclosure, further, the position information of the receiving coil relative to the transmitting coil in the electronic device can be determined based on the voltage peak value on each sensing coil, and the position information can be sent to the electronic device, so that the electronic device can prompt the user to adjust the position of the electronic device.

[0125] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. The present disclosure is intended to cover any variations, uses or adaptations of the present disclosure, which follow the general principles of the present disclosure and include common knowledge or customary techniques in the art that are not disclosed in the present disclosure. The description and examples are intended to be exemplary only, and the true scope and spirit of the present disclosure are indicated by the appended claims.

Claims

1. A wireless charging device, characterized in that: include: A transmitting coil, used to convert alternating current into a first electromagnetic signal and transmit it to wirelessly charge the electronic device; At least two detection coils are respectively arranged around the transmitting coil and located in the same plane as the transmitting coil, and are used to transmit second electromagnetic signals respectively; the arrangement relationship between each detection coil and the transmitting coil is an insulating arrangement relationship; The control module is connected to the at least two detection coils respectively, and is used to detect the voltage peaks of the voltage waveform of the at least two detection coils respectively after detecting that the voltage waveform of the second electromagnetic signal emitted by the at least two detection coils becomes continuous, and determine whether there is a misalignment between the transmitting coil and the receiving coil in the electronic device according to the voltage peaks, and when it is determined that there is a misalignment between the transmitting coil and the receiving coil, send the position information of the receiving coil relative to the transmitting coil to the electronic device.

2. The wireless charging device according to claim 1, characterized in that: The control module is further used to determine the position information of the receiving coil relative to the transmitting coil according to the corresponding relationship between each of the voltage peak values ​​and the preset voltage value and the distance.

3. The wireless charging device according to claim 2, characterized in that: Also includes: A communication module is connected to the control module; the control module is used to send the location information to the electronic device through the communication module.

4. The wireless charging device according to claim 2, characterized in that: The control module is used to send the position information to the electronic device through the transmitting coil and / or the at least two detecting coils.

5. The wireless charging device according to claim 3 or 4, characterized in that: The position information includes: information about the direction of the electronic device to be adjusted.

6. The wireless charging device according to any one of claims 1 to 4, characterized in that: The control module is used to determine that a misalignment occurs between the transmitting coil and the receiving coil when one or more voltage peaks among the voltage peaks are greater than or equal to a voltage threshold.

7. The wireless charging device according to claim 1, characterized in that: The control module includes: a voltage sampling unit and a processing unit; the voltage sampling unit is used to perform analog / digital conversion on the voltage of the second electromagnetic signal of the at least two detection coils respectively, and sample the converted voltage to obtain the voltage peak values ​​of the at least two detection coils respectively; the processing unit is used to determine whether there is a misalignment between the transmitting coil and the receiving coil according to each voltage peak value.

8. The wireless charging device according to claim 7, characterized in that: The processing unit is further configured to determine the position information of the receiving coil relative to the transmitting coil according to the corresponding relationship between each of the voltage peak values ​​and the preset voltage peak value and the distance; and send the position information to the electronic device.

9. The wireless charging device according to claim 7 or 8, characterized in that: The processing unit is used for determining that a misalignment occurs between the transmitting coil and the receiving coil when one or more voltage peaks among the voltage peaks are greater than or equal to a voltage threshold.

10. The wireless charging device according to any one of claims 1 to 4, characterized in that: Also includes: The switch is connected to the control module and the at least two detection coils respectively; the control module is used to control the switch to turn off when it is determined that there is no more displacement between the transmitting coil and the receiving coil, so that the at least two detection coils stop sending the second electromagnetic signal.

11. The wireless charging device according to any one of claims 1 to 4, characterized in that: The second electromagnetic signal includes: a pulse signal emitted in the initial stage of QI wireless charging.

12. The wireless charging device according to any one of claims 1 to 4, characterized in that: The at least two detection coils include: four detection coils, which are respectively arranged around the transmitting coil.

13. A wireless charging system, characterized in that: include: A wireless charging device and an electronic device according to any one of claims 1 to 12.

14. A wireless charging misalignment detection method, applied to a wireless charging device, characterized in that: include: After detecting that the voltage waveforms of the electromagnetic signals emitted by at least two detection coils in the wireless charging device become continuous, respectively detecting the voltage peaks of the voltage waveforms of the at least two detection coils; and According to each of the voltage peaks, it is determined whether there is a misalignment between the transmitting coil in the wireless charging device and the receiving coil in the electronic device; the setting relationship between each detection coil and the transmitting coil is an insulating setting relationship, and when it is determined that there is a misalignment between the transmitting coil and the receiving coil, the position information of the receiving coil relative to the transmitting coil is sent to the electronic device.

15. The method according to claim 14, characterized in that Also includes: The position information of the receiving coil relative to the transmitting coil is determined according to the corresponding relationship between each of the voltage peak values ​​and the preset voltage value and the distance.

16. The method according to claim 15, characterized in that Sending the location information to the electronic device includes: sending the location information to the electronic device via a communication module in the wireless charging device.

17. The method according to claim 15, characterized in that Sending the position information to the electronic device includes: sending the position information to the electronic device through the transmitting coil and / or the at least two detecting coils.

18. The method according to claim 16 or 17, characterized in that The position information includes: information about the direction of the electronic device to be adjusted.

19. The method according to any one of claims 14 to 17, characterized in that: Determining whether a position deviation occurs between a transmitting coil in the wireless charging device and a receiving coil in the electronic device according to each of the voltage peaks includes: When one or more voltage peaks among the voltage peaks are greater than or equal to a voltage threshold, it is determined that a misalignment occurs between the transmitting coil and the receiving coil.

20. The method according to claim 14, characterized in that Respectively detecting each voltage peak value of the voltage waveform of the at least two detection coils, including: respectively performing analog / digital conversion on the voltage of the electromagnetic signal of the at least two detection coils, and sampling the converted voltage to respectively obtain each voltage peak value of the at least two detection coils.

21. The method according to any one of claims 14 to 17, characterized in that: Also includes: When it is determined that there is no more displacement between the transmitting coil and the receiving coil, the switch in the wireless charging device is controlled to be turned off, so that the at least two detection coils stop sending the electromagnetic signal.

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