Electronic device, method and wireless charging system

Abstract

The present application discloses an electronic device, a method and a wireless charging system, and relates to the field of wireless charging technology. The device includes a controller, a transceiver and at least two coils; the at least two coils include a receiving coil and one or more auxiliary coils. The receiving coil couples the electric energy of the transmitting coil of the wireless charger to charge the battery. The auxiliary coil compensates for the power loss caused by the horizontal position offset between the electronic device and the wireless charger. The controller obtains the error power by using the coil coupling relationship between any two coils and the transmitting coil respectively, obtains the compensated output power from the output power and the error power, and sends the compensated output power to the transceiver. The transceiver sends the compensated output power to the wireless charger, so that the wireless charger obtains the power loss according to the input power and the compensated output power. The device can compensate for the power loss caused by the horizontal position offset between the electronic device and the wireless charger.

Description

Technical Field

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

[0002] Wireless charging technology (WCT) uses conductive media such as electric fields, magnetic fields, microwaves or lasers to achieve wireless transmission of electrical energy. Due to its advantages such as no wire restrictions and no plugging and unplugging, it is now increasingly used in electronic devices.

[0003] The wireless charging system uses wireless charging technology, including electronic devices and wireless chargers, which wirelessly charge electronic devices. If there is a metal foreign body between the electronic device and the power transmission coil module of the wireless charger (i.e., the receiving coil of the electronic device and the transmitting coil of the wireless charger), power loss (Ploss) will occur. If the power loss exceeds the set threshold value, the wireless charger will interrupt the power transmission.

[0004] However, when current electronic devices such as mobile phones and smart watches are wirelessly charged, power loss may occur during the power transmission between the electronic device and the wireless charger. The power loss may be caused by the presence of metal foreign matter or by a horizontal position offset of the power transmission coil module between the electronic device and the wireless charger. If the power loss exceeds the set threshold value, the wireless charger will interrupt the power transmission. Summary of the invention

[0005] In order to solve the above technical problems, the present application provides an electronic device, a method and a wireless charging system, which can compensate for the power loss caused by the horizontal position offset between the receiving coil of the electronic device and the transmitting coil of the wireless charger.

[0006] In a first aspect, the present application provides an electronic device, comprising: a controller, a transceiver and at least two coils. The at least two coils include a receiving coil and one or more auxiliary coils. The receiving coil is used to couple the power of the transmitting coil of the wireless charger to charge the battery in the electronic device; the auxiliary coil is used to compensate for the power loss caused by the horizontal position offset between the electronic device and the wireless charger. The controller obtains the error power by using the coil coupling relationship between any two coils of the at least two coils and the transmitting coil respectively, obtains the compensated output power by the output power of the charging circuit in the electronic device and the error power, and sends the compensated output power to the transceiver. The transceiver sends the compensated output power to the wireless charger, so that the wireless charger obtains the power loss according to the input power of the wireless charger and the compensated output power. The charging circuit is a circuit inside the electronic device, which is used to charge the battery.

[0007] When only one auxiliary coil is included, the error power can be obtained by utilizing the coil coupling relationship between the receiving coil and the auxiliary coil and the transmitting coil respectively; when two auxiliary coils are included, the error power can be obtained by utilizing the coil coupling relationship between the two auxiliary coils and the transmitting coil respectively.

[0008] When the magnetic field energy is coupled, the coupling relationship between the coil transmitting energy and the coil receiving energy determines the magnitude of the voltage coupled to the coil receiving energy. Generally, the coil coupling relationship can be represented by the coil coupling coefficient or the coil mutual inductance. Since the coil coupling coefficient is proportional to the voltage coupled to the coil receiving energy, and the coil mutual inductance is proportional to the voltage coupled to the coil receiving energy, to a certain extent, the magnitude of the voltage coupled to the coil receiving energy can also represent the coil coupling relationship. In the embodiment of the present application, the error power is obtained by using the ratio of the coil coupling relationship. In some embodiments, the error power can also be obtained by using the ratio of the voltage coupled to the coil receiving energy.

[0009] The electronic device can compensate for the power loss caused by the horizontal position offset between the receiving coil of the electronic device and the transmitting coil of the wireless charger. In addition, when detecting metal foreign matter, the loss caused by the horizontal position offset between the transmitting coil and the receiving coil will not be identified as caused by the metal foreign matter, thus avoiding the erroneous judgment that there is a metal foreign matter between the transmitting coil and the receiving coil when there is no metal foreign matter between the transmitting coil and the receiving coil but there is a horizontal position offset, thereby improving the accuracy of metal foreign matter detection.

[0010] In combination with the first aspect, in a first possible implementation, the coil coupling relationship includes any one of the following: coil mutual inductance, coil coupling coefficient, or voltage magnitude of the coil in the electronic device coupled from the transmitting coil. The coil mutual inductance is proportional to the output voltage of the coil in the electronic device, and the coil coupling coefficient is proportional to the output voltage of the coil in the electronic device. Therefore, the ratio of the output voltage of the coil in the electronic device can be used to characterize the ratio of the coil mutual inductance of the coil of the electronic device to the transmitting coil or the ratio of the coil coupling coefficient.

[0011] In combination with the first aspect, in a second possible implementation manner, the controller obtains the error power by utilizing the coil coupling relationship between any two coils of the at least two coils and the transmitting coil, specifically: the error power is obtained by utilizing the ratio of the coil coupling relationship between any two coils of the at least two coils of the controller and the transmitting coil, and there is a positive correlation between the error power and the ratio.

[0012] In combination with the first aspect, in a third possible implementation manner, the at least two coils include: a receiving coil and a first auxiliary coil. The controller obtains the error power by using a ratio of a coil coupling relationship between any two coils of the at least two coils and the transmitting coil, specifically including: the controller obtains the error power by using a ratio of an output voltage of the receiving coil and an output voltage of the first auxiliary coil.

[0013] At this time, an auxiliary coil is added to the electronic device, and the auxiliary coil and the receiving coil of the electronic device are used to compensate for the power loss caused by the horizontal position offset between the electronic device and the wireless charger.

[0014] In combination with the first aspect, in a fourth possible implementation, at least two coils include: a receiving coil and a first auxiliary coil, and the electronic device further includes a first rectifier connected to the receiving coil, and a second rectifier connected to the first auxiliary coil. The controller is used to obtain the error power by using the ratio of the coil coupling relationship between any two coils of the at least two coils and the transmitting coil, specifically: the controller is used to obtain the error power according to the ratio of the first output voltage of the first rectifier and the second output voltage of the second rectifier. At this time, the output voltage of the rectifier is a DC voltage, which is easy to collect.

[0015] In combination with the first aspect, in a fifth possible implementation manner, the controller is further used to compensate the first output voltage according to a preset impedance and an output current of the first rectifier, and obtain a ratio of the compensated voltage to the second voltage.

[0016] By compensating the first output voltage, the influence of the impedance of the electronic device on the error power can be reduced, so that the compensated output power obtained by the receiving end controller is more accurate, and the power loss obtained by the transmitting end controller is more accurate, thereby further improving the accuracy of metal foreign body detection.

[0017] In combination with the first aspect, in a sixth possible implementation manner, the at least two coils include: a receiving coil, a first auxiliary coil, and a second auxiliary coil. The controller obtains the error power by using a ratio of a coil coupling relationship between any two coils of the at least two coils and the transmitting coil, specifically: the controller obtains the error power by using a ratio of an output voltage of the first auxiliary coil to an output voltage of the second auxiliary coil.

[0018] The first auxiliary coil and the second auxiliary coil of this implementation are not used to charge the battery of the electronic device, that is, the output voltage of the second rectifier and the output voltage of the third rectifier are not affected by the voltage drop caused by the load current, so there is no need to compensate the output voltage of the rectifier.

[0019] In combination with the first aspect, in a seventh possible implementation, at least two coils include: a receiving coil, a first auxiliary coil, and a second auxiliary coil, and the electronic device also includes a first rectifier connected to the receiving coil, a second rectifier connected to the first auxiliary coil, and a third rectifier connected to the second auxiliary coil. The controller obtains the error power by using the ratio of the coil coupling relationship between any two coils of the at least two coils and the transmitting coil, specifically including: the controller obtains the error power according to the ratio of the output voltage of the second rectifier to the output voltage of the third rectifier. At this time, the output voltage of the rectifier is a DC voltage, which is convenient for collection.

[0020] In combination with the first aspect and any one of the above possible implementations, in an eighth possible implementation, the receiving coil and the auxiliary coil are located in the same plane, so providing the auxiliary coil does not increase the thickness of the coil module.

[0021] In combination with the first aspect and any one of the above possible implementations, in a ninth possible implementation, the center of the receiving coil coincides with the center of the auxiliary coil, thereby facilitating accurate determination of the horizontal position offset of the receiving coil and the transmitting coil.

[0022] In combination with the first aspect and any one of the above possible implementations, in a tenth possible implementation, the positions of the receiving coil and the auxiliary coil are any one of the following: the auxiliary coil is located at the radial inner periphery of the receiving coil, the auxiliary coil is located at the radial outer periphery of the receiving coil, and different parts of the auxiliary coil are respectively located at the radial inner periphery and radial outer periphery of the receiving coil.

[0023] In combination with the first aspect and any one of the above possible implementations, in an eleventh possible implementation, the auxiliary coil includes at least two of the following: a first auxiliary coil and a second auxiliary coil. The positions of the receiving coil and the auxiliary coil are any one of the following: the first auxiliary coil and the second auxiliary coil are both located in the radial inner periphery of the receiving coil, the first auxiliary coil and the second auxiliary coil are both located in the radial outer periphery of the receiving coil, and the first auxiliary coil and the second auxiliary coil are respectively located in the radial inner periphery and the radial outer periphery of the receiving coil.

[0024] In combination with the first aspect and any one of the above possible implementations, in a twelfth possible implementation, the auxiliary coil is one turn or multiple turns; when the auxiliary coil is multiple turns, the ends of the multiple turns of the coil are connected in parallel or in series.

[0025] In combination with the first aspect and any one of the above possible implementations, in a thirteenth possible implementation, the controller is further used to obtain a horizontal position offset between the transmitting coil and the receiving coil according to the ratio, and the ratio is positively correlated with the horizontal position offset.

[0026] In combination with the first aspect and any one of the above possible implementations, in a fourteenth possible implementation, the electronic device further includes: a display screen. The controller is also used to send the horizontal position offset to the display screen for display, so as to prompt that the relative position of the electronic device and the wireless charger needs to be corrected at this time. In addition, in some embodiments, when the controller controls the display screen to display the horizontal position offset, it can further control the electronic device to prompt by vibration, voice, ringtone, etc.

[0027] In combination with the first aspect and any of the above possible implementations, in a fifteenth possible implementation, the controller is also used to obtain the vertical distance between the electronic device and the wireless charger, and obtain the corresponding control relationship according to the vertical distance. This is because in actual applications, the vertical distance between the electronic device and the wireless charger may change, for example, the electronic device may be installed with a protective shell of different thicknesses. At this time, the corresponding control relationship is obtained according to the current vertical distance, and then the corresponding error power can be obtained more accurately, so that the compensation for the power loss caused by the horizontal position offset between the transmitting coil and the receiving coil is more accurate.

[0028] In some embodiments, the fitting equation of the mutual inductance ratio of the coil under different vertical distance values ​​can also be predetermined and stored on the electronic device. At this time, when the electronic device is placed on the wireless charger for wireless charging, the controller of the electronic device can obtain the vertical distance between the wireless charger and the wireless charger, and use the output voltage of the coil to obtain the ratio of the mutual inductance corresponding to the coil, and call the corresponding relationship between the mutual inductance ratio of the coil and the horizontal position offset length corresponding to the current vertical distance, and the fitting equation corresponding to the current vertical distance. The controller of the electronic device further obtains the horizontal position offset length corresponding to the current mutual inductance ratio based on the corresponding relationship between the mutual inductance ratio of the coil and the horizontal position offset length, and obtains the stray loss corresponding to the current mutual inductance ratio based on the fitting equation, that is, the power loss caused by the horizontal position offset between the receiving coil of the electronic device and the transmitting coil of the wireless charger is obtained.

[0029] In a second aspect, an embodiment of the present application further provides a power compensation method, which is applied to a wireless charging electronic device, the electronic device comprising: a memory, a controller and at least two coils; the at least two coils include a receiving coil and one or more auxiliary coils; and one or more computer programs, wherein the one or more computer programs are stored in the memory, and the one or more computer programs include instructions, and when the instructions are executed by the electronic device, the electronic device performs the following steps:

[0030] Obtaining error power according to the coil coupling relationship between any two coils of the at least two coils and the transmitting coil respectively;

[0031] Obtaining a compensated output power from the output power of the charging circuit in the electronic device and the error power;

[0032] The compensated output power is sent to the wireless charger, so that the wireless charger obtains power loss according to the input power of the wireless charger and the compensated output power.

[0033] By using this method, the power loss caused by the horizontal position offset between the receiving coil of the electronic device and the transmitting coil of the wireless charger can be compensated. In addition, when performing metal foreign body detection, the loss caused by the horizontal position offset between the transmitting coil and the receiving coil will not be identified as caused by the metal foreign body, thus avoiding the erroneous judgment that there is a metal foreign body between the transmitting coil and the receiving coil when there is no metal foreign body between the transmitting coil and the receiving coil but there is a horizontal position offset, thereby improving the accuracy of metal foreign body detection.

[0034] In combination with the second aspect, in a first possible implementation manner, the coil coupling relationship includes any one of the following: coil mutual inductance, coil coupling coefficient, or voltage magnitude coupled by the coil in the electronic device from the transmitting coil; the coil mutual inductance is proportional to the output voltage of the coil in the electronic device; the coil coupling coefficient is proportional to the output voltage of the coil in the electronic device.

[0035] In combination with the second aspect, in a second possible implementation manner, the error power is obtained by using the coil coupling relationship between any two coils of the at least two coils and the transmitting coil, specifically including: obtaining the error power by using the ratio of the coil coupling relationship between any two coils of the at least two coils and the transmitting coil, and the error power has a positive correlation with the ratio.

[0036] In combination with the second aspect, in a third possible implementation, when the at least two coils include a receiving coil and a first auxiliary coil, the error power is obtained by using the ratio of the coil coupling relationship between any two coils of the at least two coils and the transmitting coil, specifically including: obtaining the error power by using the ratio of the output voltage of the receiving coil to the output voltage of the first auxiliary coil.

[0037] In combination with the second aspect, in a fourth possible implementation, the at least two coils include a receiving coil and a first auxiliary coil, and the electronic device further includes: a first rectifier connected to the receiving coil, and a second rectifier connected to the first auxiliary coil. Obtaining the error power by using a ratio of coil coupling relationships between any two coils of the at least two coils and the transmitting coil, specifically includes: obtaining the error power according to a ratio of a first output voltage of the first rectifier to a second output voltage of the second rectifier.

[0038] In combination with the second aspect, in a fifth possible implementation, the method further includes: obtaining a compensation voltage according to a preset impedance and a current of the receiving coil, compensating the first output voltage using the compensation voltage, and obtaining a ratio of the compensated voltage to the second voltage. This can reduce the influence of the impedance of the electronic device on the error power, so that the compensated output power obtained by the receiving end controller is more accurate, and thus the power loss obtained by the transmitting end controller can be more accurate.

[0039] In combination with the second aspect, in a sixth possible implementation manner, the at least two coils include: a receiving coil, a first auxiliary coil, and a second auxiliary coil. Obtaining the error power by using a ratio of coil coupling relationships between any two coils of the at least two coils and the transmitting coil, specifically includes: obtaining the error power by using a ratio of an output voltage of the first auxiliary coil to an output voltage of the second auxiliary coil.

[0040] In combination with the second aspect, in a seventh possible implementation, the at least two coils include: a receiving coil, a first auxiliary coil, and a second auxiliary coil, and the electronic device further includes: a first rectifier connected to the receiving coil, a second rectifier connected to the first auxiliary coil, and a third rectifier connected to the second auxiliary coil. The error power is obtained by using the ratio of the coil coupling relationship between any two coils of the at least two coils and the transmitting coil, specifically including: obtaining the error power according to the ratio of the output voltage of the second rectifier to the output voltage of the third rectifier. At this time, the output voltage of the rectifier is a DC voltage, which is convenient for detection and acquisition.

[0041] In combination with the second aspect, in an eighth possible implementation manner, the method further includes: obtaining a horizontal position offset between the transmitting coil and the receiving coil according to a ratio, wherein the ratio is positively correlated with the horizontal position offset.

[0042] In conjunction with the second aspect, in a ninth possible implementation, the electronic device further includes: a display screen. The method further includes: sending the horizontal position offset to the display screen for display, so as to prompt that the relative position of the electronic device and the wireless charger needs to be corrected at this time.

[0043] In combination with the second aspect, in a tenth possible implementation manner, the method further includes: obtaining a vertical distance between the electronic device and the wireless charger, and obtaining the corresponding control relationship according to the vertical distance.

[0044] In a third aspect, an embodiment of the present application further provides a wireless charging system, including a wireless charger and the electronic device described above. The wireless charger includes: a transmitting coil. The transmitting coil is used to transmit electrical energy to a receiving coil to wirelessly charge the electronic device.

[0045] The wireless charging system can compensate for the power loss caused by the horizontal position offset between the receiving coil of the electronic device and the transmitting coil of the wireless charger. In addition, when detecting metal foreign matter, the loss caused by the horizontal position offset between the transmitting coil and the receiving coil will not be identified as caused by the metal foreign matter, thus avoiding the erroneous judgment that there is a metal foreign matter between the transmitting coil and the receiving coil when there is no metal foreign matter between the transmitting coil and the receiving coil but there is a horizontal position offset, thereby improving the accuracy of metal foreign matter detection.

[0046] In combination with the third aspect, in a first possible implementation, the wireless charger includes: a transmitter controller. The transmitter controller obtains a power loss according to an input power and the compensated output power, and when the power loss is greater than a preset power threshold, determines that a metal foreign object exists between the transmitting coil and the receiving coil.

[0047] In conjunction with the third aspect, in a second possible implementation, the wireless charger further includes a signal light. The signal light is used to provide a prompt when the transmitter controller determines that there is a metal foreign object between the transmitting coil and the receiving coil, or when there is a horizontal position offset between the transmitting coil and the receiving coil.

[0048] In a fourth aspect, an embodiment of the present application further provides a terminal device, including: a controller, a transceiver, and at least two coils;

[0049] The at least two coils include a receiving coil and one or more auxiliary coils;

[0050] The receiving coil is used to couple the electric energy of the transmitting coil of the wireless charger to charge the battery in the electronic device;

[0051] The auxiliary coil is used to compensate for power loss caused by a horizontal position offset between the electronic device and the wireless charger;

[0052] The controller is used to obtain error power by using the coil coupling relationship between any two coils of the at least two coils and the transmitting coil, and send the output power of the charging circuit in the electronic device and the error power to the transceiver;

[0053] The transceiver is used to send the output power and the error power to the wireless charger, so that the wireless charger obtains the power loss according to the input power of the wireless charger, the output power of the charging circuit in the electronic device and the error power.

[0054] The solution provided by this application has at least the following advantages:

[0055] The electronic device includes at least two coils, one of which is a receiving coil and the other is an auxiliary coil. When there is a horizontal position offset between the wireless charger and the electronic device and there is no metal foreign matter, the power loss between the wireless charger and the electronic device is caused by the horizontal position offset. Due to the existence of the horizontal position offset, the coupling relationship between the transmitting coil of the wireless charger transmitting energy and the receiving coil in the electronic device receiving energy will change. Therefore, an auxiliary coil is added to the electronic device, and the error power caused by the horizontal position offset is obtained by using the coil coupling relationship between two different coils in the electronic device relative to the transmitting coil. For example, when only one auxiliary coil is included, the error power can be obtained by using the coil coupling relationship between the receiving coil and the auxiliary coil and the transmitting coil respectively; when two auxiliary coils are included, the error power can be obtained by using the coil coupling relationship between the two auxiliary coils and the transmitting coil respectively. The error power represents the power loss caused by the horizontal position offset between the transmitting coil and the receiving coil. The controller obtains the compensated output power according to the output power and the error power, sends the compensated output power to the transceiver, and then the transceiver sends it to the wireless charger, so that the wireless charger obtains the power loss according to the input power and the compensated output power. At this time, the power loss caused by the horizontal position offset between the transmitting coil and the receiving coil has been compensated.

[0056] In summary, the electronic device provided by the present application can compensate for the power loss caused by the horizontal position offset between the receiving coil of the electronic device and the transmitting coil of the wireless charger. In addition, when performing metal foreign body detection, the loss caused by the horizontal position offset between the transmitting coil and the receiving coil will not be identified as caused by the metal foreign body, thus avoiding the erroneous judgment that there is a metal foreign body between the transmitting coil and the receiving coil when there is no metal foreign body between the transmitting coil and the receiving coil but there is a horizontal position offset, thereby improving the accuracy of metal foreign body detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] Figure 1 A schematic diagram of a wireless charging system provided in this application;

[0058] Figure 2 for Figure 1 A schematic diagram of the structure of the electronic device;

[0059] Figure 3 A schematic diagram of another wireless charging system provided by the present application;

[0060] Figure 4 A schematic diagram of a wireless charging system corresponding to an electronic device provided in an embodiment of the present application;

[0061] Figure 5 It is a schematic diagram of the distribution of the losses of each part corresponding to Table 1 as the horizontal position offset length changes;

[0062] Figure 6 A schematic diagram of a curve showing a change in stray loss versus horizontal position offset length provided in an embodiment of the present application;

[0063] Figure 7 Schematic diagram of the principle provided by the embodiment of this application Figure 1 ;

[0064] Figure 8 A schematic diagram of a curve of mutual inductance ratio provided in an embodiment of the present application;

[0065] Fig. 9 A schematic diagram of a curve of mutual inductance ratio and error power provided in an embodiment of the present application;

[0066] Fig.10 A schematic diagram of a wireless charging system corresponding to another electronic device provided in an embodiment of the present application;

[0067] Fig.11 A schematic diagram of a coil of an electronic device provided in an embodiment of the present application;

[0068] Fig. 12A A schematic diagram of a coil of another electronic device provided in an embodiment of the present application;

[0069] Fig. 12B A schematic diagram of a coil of another electronic device provided in an embodiment of the present application;

[0070] Fig.13 A schematic diagram of a prompt provided in an embodiment of the present application when a horizontal position offset occurs;

[0071] Fig.14 A schematic diagram of a wireless charging system corresponding to another electronic device provided in an embodiment of the present application;

[0072] Fig.15 A schematic diagram of a coil of another electronic device provided in an embodiment of the present application;

[0073] Fig.16 A schematic diagram of a power compensation method provided in an embodiment of the present application;

[0074] Fig.17A schematic diagram of a wireless charging system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0075] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0076] The terms "first", "second", etc. in the following description are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0077] In addition, in the present application, directional terms such as "upper" and "lower" may be defined including but not limited to the orientation relative to the schematic placement of the components in the drawings. It should be understood that these directional terms may be relative concepts, which are used for relative description and clarification, and may change accordingly according to the change in the orientation of the components in the drawings.

[0078] In this application, unless otherwise clearly specified 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 connection; it can be a direct connection or an indirect connection through an intermediate medium. In addition, the term "coupling" can be a way of achieving electrical connection for signal transmission. "Coupling" can be a direct electrical connection or an indirect electrical connection through an intermediate medium.

[0079] The embodiments of the present application do not specifically limit the type of electronic device, and the electronic device may be a mobile phone, a tablet computer, a computer with wireless transceiver function, a smart wearable product (e.g., a smart watch, a smart bracelet, a headset, etc.), a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, etc. The above electronic device may also be a wireless charging electric car, a wireless charging household appliance (e.g., a soymilk machine, a sweeping robot), a drone, and other electronic products.

[0080] For the sake of convenience, the following uses a mobile phone as an example to illustrate the implementation principle of wireless charging.

[0081] See also Figure 1 , which is a schematic diagram of a wireless charging system provided in this application.

[0082] The wireless charger 02 is used to wirelessly charge the electronic device 01 (i.e., a mobile phone). The wireless charger 02 shown in the figure supports the electronic device 01 to be placed horizontally above. In some embodiments, the wireless charger 02 can also have other forms, such as a vertical wireless charger with a certain inclination, so that the electronic device 01 can lean against the wireless charger 02.

[0083] The wireless charging system includes a wireless charging receiving (RX) device 20 disposed in an electronic device 01 and a battery 50 coupled to the wireless charging receiving device 20 .

[0084] The wireless charging system further includes a wireless charging transmission (TX) device 30 disposed in the wireless charger 02 , and an adapter 40 coupled to the wireless charging transmission device 30 , wherein the adapter 40 is used to provide charging power.

[0085] The wireless charging transmitting device 30 transmits power to the wireless charging receiving device 20, and at the same time, the wireless charging transmitting device 30 and the wireless charging receiving device 20 are wirelessly connected through Bluetooth (Bluetooth), wireless broadband (Wireless-Fidelity, WiFi), Zigbee protocol (Zigbee), Radio Frequency Identification technology (Radio Frequency Identification, RFID), long range (Lora) wireless technology or near field communication technology (Near Field Communication, NFC), so that wireless communication can be established between the wireless charging transmitting device 30 and the wireless charging receiving device 20.

[0086] The wireless charging transmitting device 30 and the wireless charging receiving device 20 may transmit control signals or charging data. The charging data may be used to indicate the charging type. In some embodiments, the charging data may be a charging protocol, such as the wireless charging standard Qi launched by the Wireless Power Consortium (WPC), such as the BPP (basic power profile) protocol, or the EPP (extended power profile) protocol.

[0087] See also Figure 2 , the figure is Figure 1 Schematic diagram of the structure of the electronic device.

[0088] Taking the above-mentioned electronic device 01 as a mobile phone as an example, it mainly includes a display panel (DP) 10. The display panel 10 can be a liquid crystal display (LCD) screen, or an organic light emitting diode (OLED) display screen, etc. When the mobile phone adopts a folding screen architecture or a multi-screen architecture, the mobile phone can also include multiple screens, and the multiple screens can also be a combination of the above different types of screens, which is not limited in this application.

[0089] The electronic device 01 may further include a middle frame 11 and a housing 12. The display screen 10 and the housing 12 are respectively located on both sides of the middle frame 11, the back of the display screen 10 faces the housing 12, and the display screen 10 and the housing 12 are connected through the middle frame 11. The middle frame 11 includes a carrier board 110 and a frame 111 surrounding the carrier board 110. The electronic device 01 may further include a printed circuit board (PCB).

[0090] The working principle of the wireless charging system is described in detail below.

[0091] See also Figure 3 , which is a schematic diagram of another wireless charging system provided in this application.

[0092] Figure 3 The circuit diagram of the wireless charging system is shown in FIG. 1 , wherein the wireless charger 02 includes a power supply 30 , a transmitter controller 301 , an inverter 302 , a transmitter transceiver 306 , a matching capacitor C1 and a transmitter coil L1 .

[0093] The electronic device 01 includes a receiving coil L2 , a matching capacitor C2 , a rectifier 303 , a receiving end controller 304 , a receiving end transceiver 305 , a charging circuit 60 and a battery 50 .

[0094] The power supply 30 can be provided by Figure 1 The adapter 40 in is implemented.

[0095] The inverter 302 is used to convert the DC power output by the power supply 30 into AC power and then output it, so that the transmitting coil L1 generates high-frequency AC power and emits an alternating magnetic field. The receiving coil L2 outputs AC power after receiving the above-mentioned alternating magnetic field, and the rectifier 303 converts the AC power into DC power and then inputs it into the charging circuit 60, and the charging circuit 60 realizes charging of the battery 50.

[0096] The battery 50 may be one battery. In some embodiments, the electronic device may include multiple batteries.

[0097] The receiving end transceiver 305 and the transmitting end transceiver 306 may transmit control signals or charging data.

[0098] The receiving end transceiver 305 can be coupled to the receiving end controller 304, and the receiving end controller 304 can identify the charging protocol sent by the transmitting end transceiver 306 to the receiving end transceiver 305 to determine the charging type of the electronic device 01. For example, the charging type can be the first charging type (for example, low-power charging suitable for slow charging) or the above-mentioned charging type can be the second charging type (for example, high-power charging suitable for fast charging).

[0099] In the prior art, when the wireless charger 02 wirelessly charges the electronic device 01, if there is a metal foreign object between the receiving coil L2 and the transmitting coil L1, power loss (Ploss) will occur. When the power loss exceeds the set threshold value, the wireless charger 02 will interrupt the power transmission.

[0100] However, there may be a horizontal position offset between the receiving coil L2 and the transmitting coil L1, in which case there will also be power loss. If the horizontal position offset is large, the power loss may exceed the set threshold value and cause the wireless charger to interrupt power transmission.

[0101] In order to solve the above technical problems, an embodiment of the present application provides an electronic device, which includes at least two coils, one of which is a receiving coil and the rest are auxiliary coils. The auxiliary coils are added to compensate for the power loss caused by the horizontal position offset between the electronic device and the wireless charger.

[0102] In order to enable those skilled in the art to more clearly understand the technical solution of the present application, the technical solution of the present application is described below in conjunction with the accompanying drawings.

[0103] Embodiment 1:

[0104] See also Figure 4 , which is a schematic diagram of a wireless charging system corresponding to an electronic device provided in an embodiment of the present application.

[0105] The electronic device includes a controller (receiving end controller 304 in the figure) and at least two coils.

[0106] At least two coils include a receiving coil L2, and the rest are auxiliary coils. Figure 4 In the description, an electronic device including an auxiliary coil, namely, the first auxiliary coil L3 is taken as an example.

[0107] In some embodiments, the electronic device may also include multiple auxiliary coils, which will be described in detail in subsequent embodiments.

[0108] The receiving coil L2 is used to couple the power of the transmitting coil L1 to charge the battery 50 in the electronic device.

[0109] The following first explains the principle of the controller to achieve power loss compensation.

[0110] Continue to see Figure 4 The wireless charging system shown now only considers the influence of the horizontal position offset between the transmitting coil L1 and the receiving coil L2 on the power loss, that is, there is no metal foreign matter between the transmitting coil L1 and the receiving coil L2, and the power loss between the transmitting coil L1 and the receiving coil L2 is caused by the horizontal position offset between the transmitting coil L1 and the receiving coil L2.

[0111] The trend of the power loss actually measured as a function of the horizontal position offset length between the transmitting coil L1 and the receiving coil L2 is shown in the following table.

[0112] Table 1: Measurement of power loss versus horizontal position offset length

[0113]

[0114] Among them, the first column of Table 1 is the horizontal position offset length, in millimeters (mm). Comprehensive analysis of Table 1 shows that except for the stray loss in the fifth column, the other types of losses have a small change with the horizontal position offset length. The stray loss increases significantly with the increase of the horizontal position offset length, that is, there is a positive correlation between the stray loss and the horizontal position offset.

[0115] See also Figure 5 ,This figure is a schematic diagram of the distribution of the losses of each part corresponding to Table 1 as the horizontal position offset length changes.

[0116] From the power loss distribution diagram, it can be found intuitively that when the horizontal position offset length between the transmitting coil L1 and the receiving coil L2 increases, the stray loss increases significantly. The stray loss includes the sum of the eddy current loss of the conductor, the loss of the magnetic shielding material and the loss caused by other reasons.

[0117] Therefore, when there is a horizontal position offset between the transmitting coil L1 of the wireless charger and the receiving coil L2 of the electronic device and there is no metal foreign matter, a relatively obvious stray loss will be generated, that is, the power loss will increase.

[0118] The accuracy of metal foreign body detection depends on the calculation accuracy of power loss (Ploss). When there is no metal foreign body between the transmitting coil L1 and the receiving coil L2 but there is a horizontal position offset, the stray loss introduced by the horizontal position offset causes the power loss to increase, so it may be mistakenly determined that there is a metal foreign body between the transmitting coil and the receiving coil, thereby affecting the accuracy of metal foreign body detection.

[0119] Therefore, accurately compensating for the stray loss caused by the horizontal position offset between the transmitting coil L1 and the receiving coil L2 becomes the key to improving the calculation accuracy of the power loss (Ploss).

[0120] See also Figure 6 , which is a schematic diagram of a curve showing the variation of stray loss with horizontal position offset length provided in an embodiment of the present application.

[0121] Referring to the curve diagram, corresponding to the data in the stray loss column of Table 1, the key to achieving stray loss compensation is to compensate for the stray loss caused by the horizontal position offset through curve fitting based on the horizontal position offset length information (the loss caused by metal foreign matter cannot be compensated), thereby improving the accuracy of judging metal foreign matter based on power loss in wireless charging. The principle and implementation method of curve fitting are described in detail below.

[0122] The embodiment of the present application adds an auxiliary coil to the electronic device, and then uses the coil coupling relationship between any two coils of the electronic device and the transmitting coil to obtain the power loss caused by the horizontal position offset.

[0123] The coil coupling relationship includes any one of the following: coil mutual inductance, coil coupling coefficient, or voltage magnitude coupled by the coil in the electronic device from the transmitting coil, wherein the coil mutual inductance is proportional to the output voltage of the coil in the electronic device; the coil coupling coefficient is proportional to the output voltage of the coil in the electronic device.

[0124] In some embodiments, the error power can be obtained by specifically utilizing the ratio of the coil coupling relationship between any two coils of the at least two coils of the electronic device and the transmitting coil, wherein the error power is the power loss caused by the horizontal position offset between the electronic device and the wireless charger, and the error power is positively correlated with the ratio.

[0125] The following first takes the coil coupling relationship as coil mutual inductance as an example to illustrate the principle of using a receiving coil and an auxiliary coil to obtain error power in the present application.

[0126] See also Figure 7 , which is a schematic diagram of the principle provided by the embodiment of the present application Figure 1 .

[0127] Corresponds to Figure 4 The wireless charging system shown in the figure includes at least three coils: a transmitting coil L1, a receiving coil L2 and at least one auxiliary coil L3. The following first takes the number of the auxiliary coils as 1 as an example for description.

[0128] The mutual inductance of the receiving coil L2 to the transmitting coil L1 is M12, and the mutual inductance of the auxiliary coil L3 to the transmitting coil L1 is M13.

[0129] The excitation voltage U1 is the voltage across the transmitting coil L1, U2 is the induced voltage of the receiving coil L2, U3 is the induced voltage of the auxiliary coil L3, and I1 is the induced current of the auxiliary coil L3 and the receiving coil L2.

[0130] Since the induced voltage U2 of the receiving coil L2 ∝ M12×I1, the induced voltage U3 of the auxiliary coil L3 ∝ M13×I1, that is, the induced voltage is proportional to the mutual inductance, and the mutual inductance determines the induced voltage of the coil, the voltage ratio can also be used to characterize the mutual inductance ratio.

[0131] When there is a horizontal position offset between the transmitting coil L1 and the receiving coil L2 ( Figure 7 When the horizontal position offset is represented by the center offset, the relative position of the receiving coil L2 and the auxiliary coil L3 is fixed, and the transmitting coil L1 and the auxiliary coil L3 also have a corresponding horizontal position offset.

[0132] When the receiving coil L2 and the auxiliary coil L3 of the electronic device are arranged in the same plane, Figure 7 The vertical distance in the figure refers to the distance between the plane where the transmitting coil L1 is located and the plane where the receiving coil L2 is located. The vertical distance is referred to as the Z-direction distance hereinafter.

[0133] For a wireless charging system including an electronic device and a wireless charger, the Z-direction distance may change. For example, when different types of protective cases are placed on the electronic device, the Z-direction distance between the plane where the transmitting coil L1 is located and the plane where the receiving coil L2 is located may change.

[0134] See also Figure 8 , which is a curve diagram of the mutual inductance ratio provided in an embodiment of the present application.

[0135] The figure shows the relationship curve between the ratio of mutual inductance M13 to M12 and the horizontal position offset length of the same electronic device when the Z-direction distance (4mm, 5mm and 6mm are used as examples) is different. It can be found that when the Z-direction distance is fixed, as the horizontal position offset length between the transmitting coil L1 and the receiving coil L2 increases, the ratio of mutual inductance M13 to M12 increases accordingly, and the two have a positive correlation.

[0136] When the horizontal position offset length is fixed, as the Z-direction distance increases, the ratio of the mutual inductance M13 to M12 also increases accordingly. The above situation can correspond to the scene where a protective cover (protective shell) is installed on the electronic device in actual application, that is, the thicker the protective shell, the corresponding increase in the Z-direction distance, resulting in a corresponding increase in the ratio of the mutual inductance M13 to M12.

[0137] See also Fig. 9 , which is a curve diagram of the mutual inductance ratio and the error power provided in the embodiment of the present application.

[0138] Fig. 9 Taking the Z-direction length (i.e., the distance between the planes where the transmitting coil L1 and the receiving coil L2 are located) of 6 mm and the center offset (i.e., the horizontal position offset length) of 0-10 mm as an example, the relationship curve between the ratio of M13 to M12 and the stray loss is shown.

[0139] right Fig. 9 The curve shown in the figure is fitted, and the fitting equation is: y = -1.0884x 2 +9.8417x-17.615. Where x is the ratio of M13 to M12, and y is the stray loss.

[0140] According to the relationship shown in the equation, the error power is obtained to compensate the stray loss shown in Table 1, and the stray loss after compensation is shown in the following table.

[0141] Table 2: Error table of stray loss after compensation

[0142]

[0143] From the compensated error data shown in Table 3, it can be found that the power loss caused by the horizontal position offset between the receiving coil and the transmitting coil of the wireless charger is significantly reduced after compensation.

[0144] Further, see the power loss (Ploss) thresholds corresponding to the BPP (Basic Power Profile) protocol and the EPP (Extended Power Profile) protocol defined by the wireless charging standard Qi as shown in the table below. Among them, the output power of the charging circuit in the electronic device in the BPP protocol is 5W, and the output power of the charging circuit in the electronic device in the EPP protocol can reach 15W.

[0145] Table 3: Correspondence between power loss (Ploss) threshold and output power

[0146]

[0147]

[0148] When the power loss reaches the Ploss threshold, the wireless charger will interrupt the power transmission. From the data in Table 2, it can be seen that after compensating for the stray loss through the fitting equation, the stray loss introduced into the wireless charging system due to the horizontal position offset becomes very small, not exceeding 150mW, which is less than the power loss threshold of 350mW at which the wireless charger will interrupt the power transmission under the BPP protocol, and less than the power loss threshold of 350mW-750mW at which the wireless charger will interrupt the power transmission under the EPP protocol. Therefore, the wireless charger will not interrupt the power transmission due to the horizontal position offset between the receiving coil of the electronic device and the transmitting coil of the wireless charger when there is no metal foreign matter. That is, when metal foreign matter detection is achieved by detecting power loss (Ploss), the loss caused by the horizontal position offset between the transmitting coil and the receiving coil in the power loss has been compensated, so that metal foreign matter detection can be performed more accurately.

[0149] It can be understood that the fitting equation obtained above is taken as a quadratic equation for illustration. In some embodiments, the fitting equation can also be a linear equation or an equation in other forms, depending on the fitting algorithm used, which will not be described in detail in the embodiments of the present application.

[0150] In some embodiments, the corresponding error power can also be obtained by using the ratio of the output voltages of the receiving coil and the transmitting coil, that is, the ratio of M12 to M13 is obtained. The principle of this implementation method is the same as the above description, and the embodiments of the present application will not be repeated here.

[0151] The controller in the embodiment of the present application may be a main processor on the electronic device, or may be other processors on the electronic device. For example, when the electronic device is a mobile phone, the controller may be the main processor of the mobile phone, i.e., the CPU, or may be other processors, such as other chips with computing control functions.

[0152] In the above embodiments, for the electronic device, the corresponding relationship between the mutual inductance ratio of the coil and the horizontal position offset length at different Z-direction distances can be measured and determined in advance and then stored in the electronic device, for example, in a memory of the electronic device.

[0153] Furthermore, the fitting equation of the mutual inductance ratio of the coils at each Z-direction distance value may also be predetermined and stored in the electronic device.

[0154] At this time, when the electronic device is placed on the wireless charger for wireless charging, the controller of the electronic device can obtain the Z-direction distance between the wireless charger and the wireless charger, and use the output voltage of the coil to obtain the ratio of the mutual inductance corresponding to the coil, and call the correspondence between the mutual inductance ratio of the coil corresponding to the current Z-direction distance and the horizontal position offset length, as well as the fitting equation corresponding to the current Z-direction distance.

[0155] The controller of the electronic device further obtains the horizontal position offset length corresponding to the current mutual inductance ratio based on the correspondence between the mutual inductance ratio of the coil and the horizontal position offset length, and obtains the stray loss corresponding to the current mutual inductance ratio according to the fitting equation, that is, the power loss caused by the horizontal position offset between the receiving coil of the electronic device and the transmitting coil of the wireless charger is obtained.

[0156] Continue to see Figure 4 Wireless charging system, based on the principles described above, the working principle of the electronic device provided by the embodiment of the present application is described below.

[0157] The receiving end controller 304 obtains error power using the output voltage V1 of the receiving coil L2 and the output voltage V2 of the first auxiliary coil L3, which is represented by ΔP.

[0158] Specifically, the controller may use the ratio of the output voltage V1 of the receiving coil L2 to the output voltage V2 of the first auxiliary coil L3 to obtain the ratio of the mutual inductances of the corresponding receiving coil L2 and the first auxiliary coil L3.

[0159] The receiving end controller 304 obtains the compensated output power Prx from the output power Pout and the error power ΔP, where Prx=Pout+ΔP.

[0160] The receiving end controller 304 sends the compensated output power Prx to the receiving end transceiver, which then sends it to the wireless charger, so that the wireless charger can obtain the power loss Ploss according to the input power Pin and the compensated output power Prx. Wherein, Ploss=Pin-Prx.

[0161] It should be noted that the wireless charger is connected to a power source, such as a mains power source, and the input power Pin of the wireless charger can be obtained by the input voltage and input current of the wireless charger. The output power Pout in an electronic device refers to the power output to the charging circuit, and Pout can be obtained by using the output voltage and input current of the rectifier corresponding to the receiving coil, such as Figure 4 As shown, the output power Pout can be obtained through the output voltage and output current of the first rectifier 303a.

[0162] Of course, in some embodiments, the error power can also be obtained by using the ratio of the coupling coefficients of the coils at the receiving end. Since the coil coupling coefficient is proportional to the output voltage of the coil in the electronic device, the ratio of the output voltages of any two coils at the receiving end can still be used to represent the coil coupling relationship between the two coils and the transmitting coil, and then the error power can be obtained. The embodiments of this application will not be described in detail here.

[0163] In some embodiments, the role of the auxiliary coil can be determined by the following method: when other conditions of the electronic device are fixed, directly measure the feedback power of the electronic device to the wireless charger when the electronic device includes the auxiliary coil, and then measure the feedback power of the electronic device to the wireless charger when the electronic device does not include the auxiliary coil, and compare the difference between the two feedback powers obtained from the two measurements, so as to determine that the role of the auxiliary coil is to compensate for the error power.

[0164] In summary, when the electronic device includes only one auxiliary coil, the error power can be obtained by using the coil coupling relationship between the receiving coil and the auxiliary coil and the transmitting coil respectively; when two auxiliary coils are included, the error power can be obtained by using the coil coupling relationship between the two auxiliary coils and the transmitting coil respectively, and the error power represents the power loss caused by the horizontal position offset between the transmitting coil and the receiving coil, and the error power is positively correlated with the ratio. The controller obtains the compensated output power from the output power and the error power, and sends the compensated output power to the wireless charger, so that the wireless charger obtains the power loss according to the input power and the compensated output power, and at this time, the power loss caused by the horizontal position offset between the transmitting coil and the receiving coil in the power loss has been compensated.

[0165] In summary, the electronic device provided by the embodiment of the present application can compensate for the power loss caused by the horizontal position offset between the receiving coil of the electronic device and the transmitting coil of the wireless charger, and the auxiliary coil mainly detects the excitation magnetic flux, that is, the magnetic flux provided by the transmitting coil, and is insensitive to the magnetic flux changes caused by metal foreign matter. Therefore, it will not compensate for the power loss caused by the metal foreign matter. When performing metal foreign matter detection, the loss caused by the horizontal position offset between the transmitting coil and the receiving coil will not be identified as being caused by the metal foreign matter, thereby avoiding the erroneous judgment that there is a metal foreign matter between the transmitting coil and the receiving coil when there is no metal foreign matter between the transmitting coil and the receiving coil but there is a horizontal position offset, thereby also improving the accuracy of metal foreign matter detection.

[0166] Embodiment 2:

[0167] The working principle of the electronic device including the receiving coil and the first auxiliary coil is explained below in conjunction with a specific implementation.

[0168] See also Fig.10 , which is a schematic diagram of a wireless charging system corresponding to another electronic device provided in an embodiment of the present application.

[0169] The electronic device includes a receiving coil L2 and a first auxiliary coil L3, and further includes a first rectifier 303a connected to the receiving coil L2, and a second rectifier 303b connected to the first auxiliary coil L3.

[0170] In a possible implementation, the controller can obtain the error power by using the ratio of the output voltage of the receiving coil L2 and the output voltage of the first auxiliary coil L3. The output voltage of the coil is an AC voltage, and the controller can obtain the corresponding error power according to the ratio of the peak values ​​of the output voltages of the two coils or the ratio of the effective values ​​of the output voltages of the two coils, which is not specifically limited in the embodiment of the present application.

[0171] In another possible implementation, the ratio of the DC output voltages corresponding to the two coils may be used. For example, the controller is used to obtain the error power according to the ratio of the first output voltage V1 of the first rectifier 303a to the second output voltage V2 of the second rectifier 303b.

[0172] Further, for the second implementation method above, when the error power is obtained by using the ratio of the output voltage of the rectifier corresponding to the receiving coil L2 and the first auxiliary coil L1, since the current output by the receiving coil needs to charge the battery, a voltage drop will be generated when the load current flows through the receiving coil L2, capacitor C2 and the first rectifier 303a of the electronic device, thereby affecting the accuracy of the first output voltage V1 of the first rectifier 303a obtained. Therefore, in order to compensate for the error caused by the load current to the voltage, the equivalent resistance of the receiving coil L2, capacitor C2 and the first rectifier 303a of the electronic device can be represented by Requ, and the output current of the electronic device is Iout. Then the receiving end controller 304 can also compensate the first output voltage V1 of the first rectifier 303a through Requ and Iout, and the compensated output voltage V1' is obtained by the following formula:

[0173] V1'=V1+Requ×Iout(1)

[0174] Requ in formula (1) is a preset impedance, which can be predetermined and stored in the electronic device, and Iout can be detected in real time.

[0175] The receiving end controller 304 compensates the first output voltage V1 according to the preset impedance Requ and the output current of the first rectifier 303a, and then obtains the ratio of the compensated voltage V1' to the second voltage V2, obtains the corresponding error power △P according to the ratio, and obtains the compensated output power Prx from the output power Pout and the error power △P. Wherein, Prx=Pout+△P. Then the receiving end controller 304 sends the compensated output power Prx to the wireless charger.

[0176] Since the first output voltage V1 of the first rectifier 303a is compensated at the electronic device end, the influence of the impedance of the electronic device on the error power △P can be reduced, so that the compensated output power Prx obtained by the receiving end controller 304 is more accurate, and the power loss obtained by the transmitting end controller is more accurate, thereby further improving the accuracy of metal foreign body detection.

[0177] See also Fig.11 , which is a schematic diagram of a coil of an electronic device provided in an embodiment of the present application.

[0178] Corresponds to Fig.10 In the electronic device shown, the receiving coil L2 can be arranged radially inwardly of the first auxiliary coil L3. In this case, the first end ② and the second end ③ of the receiving coil L2 are located between the first end ① and the second end ④ of the first auxiliary coil L3.

[0179] The first auxiliary coil L3 may be a single-turn coil or a multi-turn coil. When the first auxiliary coil L3 is a multi-turn coil, the ends of the multi-turns are connected in parallel or in series.

[0180] Furthermore, in some embodiments, the receiving coil L2 and the first auxiliary coil L3 are located in the same plane, so the thickness of the coil module of the electronic device is not increased, thereby facilitating the electronic device to be made thinner and lighter.

[0181] In some embodiments, the center of the receiving coil L2 coincides with the center of the first auxiliary coil L3. That is, when the receiving coil L2 and the first auxiliary coil L3 are circular windings, the centers of the receiving coil L2 and the first auxiliary coil L3 coincide when they are set. When there are other non-circular coils in the receiving coil L2 and the first auxiliary coil L3, such as a square coil, the geometric center points of the receiving coil L2 and the first auxiliary coil L3 coincide when they are set.

[0182] See also Fig. 12A , which is a schematic diagram of a coil of another electronic device provided in an embodiment of the present application.

[0183] In some other embodiments of the present application, the first auxiliary coil L3 is disposed radially inward of the receiving coil L2. The first end ② and the second end ③ of the receiving coil L2 are located between the first end ① and the second end ④ of the first auxiliary coil L3.

[0184] See also Fig. 12B , which is a schematic diagram of a coil of another electronic device provided in an embodiment of the present application.

[0185] In some other embodiments of the present application, a portion of the first auxiliary coil L3 is disposed radially inwardly of the receiving coil L2, and another portion is disposed radially outwardly of the receiving coil L2. The first end ② and the second end ③ of the receiving coil L2 are located between the first end ① and the second end ④ of the first auxiliary coil L3.

[0186] Further, in some embodiments, the controller can also obtain the horizontal position offset between the transmitting coil L1 and the receiving coil L2 according to the obtained ratio, that is, obtain the horizontal position offset length. Specifically, the receiving end controller 304 can determine the error power at this time by the fitting equation, and then obtain the horizontal offset by the correspondence between the predetermined error power and the horizontal offset (the correspondence between the horizontal position offset length). In some embodiments, the correspondence between the predetermined error power and the horizontal offset can be stored in the electronic device in the form of a data table, and then the horizontal offset corresponding to the current error power can be determined by looking up the table.

[0187] See also Fig.13 , which is a schematic diagram of a prompt provided in an embodiment of the present application when a horizontal position offset occurs.

[0188] The electronic device 01 may also include a display screen. For a description of the display screen, see Figure 2 The description of the display screen 10 in the embodiment of the present application is not repeated here. The controller can also send the horizontal position offset to the display screen for display to prompt that the relative position of the electronic device and the wireless charger needs to be corrected at this time. In addition, in some embodiments, when the controller controls the display screen to display the horizontal position offset, it can further control the electronic device to prompt by vibration, voice, ringtone, etc.

[0189] The wireless charger 02 may also be provided with a signal light with a prompting function, and the signal light is used to prompt when a horizontal position deviation occurs, for example, the signal light may flash or switch to a preset color to prompt when a horizontal position deviation occurs. The signal light may also be used to prompt when the controller of the wireless charger (i.e., the transmitter controller) determines that there is a metal foreign body between the transmitting coil and the receiving coil.

[0190] In summary, the controller of the electronic device provided in the embodiment of the present application can obtain error power according to the ratio of the output voltage of the receiving coil and the first auxiliary coil, or obtain error power according to the ratio of the first output voltage of the first rectifier and the second output voltage of the second rectifier. The error power represents the power loss caused by the horizontal position offset between the transmitting coil and the receiving coil, and the error power is positively correlated with the ratio. The controller obtains the compensated output power from the output power and the error power, and sends the compensated output power to the wireless charger, so that the wireless charger obtains the power loss according to the input power and the compensated output power. Since the power loss caused by the horizontal position offset between the transmitting coil and the receiving coil has been compensated in the power loss, the accuracy of metal foreign body detection using the power loss is higher.

[0191] In addition, when the controller obtains the error power based on the ratio of the first output voltage of the first rectifier and the second output voltage of the second rectifier, the first voltage can be compensated by using the preset impedance and the output current of the first rectifier, thereby reducing the influence of the impedance of the electronic device on the error power, so that the compensated output power obtained by the receiving end controller is more accurate, and the power loss obtained by the transmitting end controller is more accurate, thereby further improving the accuracy of metal foreign body detection.

[0192] Embodiment three:

[0193] The above introduction is an electronic device including a receiving coil and an auxiliary coil as an example. The ratio is the ratio of the voltages corresponding to the receiving coil and the auxiliary coil. The following description shows that the electronic device includes two auxiliary coils, and the ratio is obtained by using the voltages corresponding to the two auxiliary coils to perform error power compensation.

[0194] See also Fig.14 , which is a schematic diagram of a wireless charging system corresponding to another electronic device provided in an embodiment of the present application.

[0195] The electronic device includes a receiving coil L2, a first auxiliary coil L3 and a second auxiliary coil L4. The controller also includes a first rectifier 303a connected to the receiving coil L2, a second rectifier 303b connected to the first auxiliary coil L3 and a third rectifier 303c connected to the second auxiliary coil L4.

[0196] In a possible implementation, the receiving end controller 304 is used to obtain the error power by using the ratio of the output voltage of the first auxiliary coil L3 and the output voltage of the second auxiliary coil L4. The output voltage of the coil is an AC voltage, and the controller can obtain the corresponding error power according to the ratio of the peak values ​​of the output voltages of the two coils or the ratio of the effective values ​​of the output voltages of the two coils, which is not specifically limited in the embodiment of the present application.

[0197] In another possible implementation, the controller is used to obtain the error power ΔP according to the ratio of the output voltage V2 of the second rectifier 303b and the output voltage V3 of the third rectifier 303c, and obtain the compensated output power Prx from the output power Pout and the error power ΔP, wherein Prx=Pout+ΔP.

[0198] Then the receiving end controller 304 sends the compensated output power Prx to the wireless charger, so that the wireless charger obtains the power loss Ploss according to the input power Pin and the compensated output power Prx, where Ploss=Pin-Prx.

[0199] See also Fig.15 , which is a schematic diagram of a coil of another electronic device provided in an embodiment of the present application.

[0200] In some embodiments, the first auxiliary coil L3 and the second auxiliary coil L4 are respectively located in the radial inner periphery and the radial outer periphery of the receiving coil L2. In this case, the first end ① and the second end ④ of the second auxiliary coil L4 are at the outermost periphery, the first end ② of the receiving coil L2 is between the first end ① of the second auxiliary coil L4 and the first end ⑤ of the first auxiliary coil L3, and the second end ③ of the receiving coil L2 is between the second end ④ of the second auxiliary coil L4 and the second end ⑥ of the first auxiliary coil L3.

[0201] In addition, in some other embodiments, the first auxiliary coil L3 and the second auxiliary coil L4 may be both located radially inside the receiving coil L2; the first auxiliary coil L3 and the second auxiliary coil L4 may be both located radially outside the receiving coil L2. The embodiments of the present application will not be described one by one again.

[0202] In some embodiments, the receiving coil L2, the first auxiliary coil L3, and the second auxiliary coil L4 are located in the same plane, so the thickness of the coil module of the electronic device is not increased, thereby facilitating the electronic device to be made thinner and lighter.

[0203] In some embodiments, the center of the receiving coil L2, the center of the first auxiliary coil L3, and the center of the second auxiliary coil L4 coincide. That is, when the receiving coil L2, the first auxiliary coil L3, and the second auxiliary coil L4 are annular windings, the centers of the receiving coil L2, the first auxiliary coil L3, and the second auxiliary coil L4 coincide when they are set. When there are other non-annular coils in the receiving coil L2, the first auxiliary coil L3, and the second auxiliary coil L4, such as square coils, the geometric center points of the receiving coil L2, the first auxiliary coil L3, and the second auxiliary coil L4 coincide.

[0204] In some embodiments, the first auxiliary coil L3 and the second auxiliary coil L4 may be one turn or multiple turns. When multiple turns are used, the ends of the multiple turns of the coils are connected in parallel or in series. The number of turns of the first auxiliary coil L3 and the second auxiliary coil L4 may be the same or different, which is not specifically limited in the present embodiment. Fig.15 Taking the coil schematic diagram shown in the figure as an example, the end position of the auxiliary coil is the position of the label ①④⑤⑥ in the figure. When the ends of the multi-turn coils are connected in series, the end corresponding to the label ⑥ can be connected in series with the end corresponding to the label ①. When the ends of the multi-turn coils are connected in parallel, the end corresponding to the label ⑥ can be connected to the end corresponding to the label ③, and the end corresponding to the label ⑤ can be connected to the end corresponding to the label ① to achieve the parallel connection of the inner and outer coils.

[0205] Furthermore, in some embodiments, the controller can also determine the horizontal position offset between the transmitting coil L1 and the receiving coil L2 according to the obtained ratio, that is, obtain the horizontal position offset length. Specifically, the receiving end controller 304 can determine the error power at this time by the fitting equation, and then determine the horizontal offset by the correspondence between the predetermined error power and the horizontal offset (the correspondence between the horizontal position offset length). In some embodiments, the correspondence between the predetermined error power and the horizontal offset can be stored in the electronic device in the form of a data table, and then the horizontal offset corresponding to the current error power can be determined by looking up the table.

[0206] The electronic device may further include a display screen, and the controller may further send the horizontal position offset to the display screen for display, so as to prompt that the relative position of the electronic device and the wireless charger needs to be corrected. In addition, in some embodiments, when the controller controls the display screen to display the horizontal position offset, it may further control the electronic device to prompt by vibration, voice, ringtone, etc.

[0207] In summary, the controller of the electronic device provided in the embodiment of the present application can obtain error power according to the ratio of the output voltages of the first auxiliary coil and the second auxiliary coil, or obtain error power according to the ratio of the output voltage of the second rectifier and the output voltage of the third rectifier, and the error power represents the power loss caused by the horizontal position offset between the transmitting coil and the receiving coil, and the error power is positively correlated with the ratio. The controller obtains the compensated output power from the output power and the error power, and sends the compensated output power to the wireless charger, so that the wireless charger obtains the power loss according to the input power and the compensated output power. Since the power loss caused by the horizontal position offset between the transmitting coil and the receiving coil has been compensated in the power loss, the accuracy of metal foreign body detection using the power loss is higher.

[0208] In addition, when the controller obtains the error power based on the ratio of the output voltage of the second rectifier to the output voltage of the third rectifier, since the first auxiliary coil and the second auxiliary coil are not used to charge the battery 50, that is, the output voltage of the second rectifier and the output voltage of the third rectifier are not affected by the voltage drop caused by the load current, there is no need to compensate for the output voltage of the rectifier.

[0209] Method Example:

[0210] Based on the electronic device provided in the above embodiments, the embodiments of the present application further provide a power compensation method, which is applied to a wireless charging electronic device and is described in detail below with reference to the accompanying drawings.

[0211] See also Fig.16 , which is a schematic diagram of a power compensation method provided in an embodiment of the present application.

[0212] The method is applied to a wireless charging electronic device, which includes a controller, at least two coils and a transceiver, wherein the at least two coils include a receiving coil and the rest are auxiliary coils.

[0213] The receiving coil is used to couple the electric energy of the transmitting coil to charge the battery in the electronic device.

[0214] The auxiliary coil is used to compensate for the power loss caused by the horizontal position offset between the electronic device and the wireless charger.

[0215] For detailed description of the electronic device, please refer to the above embodiments, and the embodiments of the present application will not be described in detail here.

[0216] The principle of the method is to obtain error power by utilizing the coil coupling relationship between any two coils of at least two coils of the electronic device and the transmitting coil, wherein the coil coupling relationship includes any one of the following: coil mutual inductance, coil coupling coefficient, or voltage magnitude coupled by the coil in the electronic device from the transmitting coil; the coil mutual inductance is proportional to the output voltage of the coil in the electronic device; the coil coupling coefficient is proportional to the output voltage of the coil in the electronic device.

[0217] In some embodiments, the error power may be obtained by using the ratio of the coil coupling relationship between any two coils of the at least two coils and the transmitting coil, and the error power and the ratio are in a positively correlated comparison relationship.

[0218] The following description is made by taking the case where the coil coupling relationship is the coil mutual inductance as an example. When the coil coupling relationship is the other two relationships, the principles are similar and will not be described in detail in the embodiments of the present application.

[0219] The electronic device may include a memory, and one or more computer programs, wherein the one or more computer programs are stored in the memory, and the one or more computer programs include instructions, and when the instructions are executed by the electronic device, the electronic device performs the following steps:

[0220] S1601: The electronic device is placed on the wireless charger to start wireless charging.

[0221] S1602: The controller of the electronic device obtains a vertical distance between a plane where the transmitting coil is located and a plane where the receiving coil is located.

[0222] The vertical distance is the Z-direction distance described in the above embodiment.

[0223] S1603: The controller of the electronic device obtains the corresponding relationship between the mutual inductance ratio of the coils corresponding to the vertical distance and the horizontal position offset length, and obtains a fitting equation for the mutual inductance ratio corresponding to the vertical distance.

[0224] In some embodiments, the corresponding relationship between the mutual inductance ratio of the coils at different vertical distances and the horizontal position offset length can be measured and determined in advance and then stored in the electronic device, for example, in a memory of the electronic device.

[0225] Furthermore, the fitting equation of the mutual inductance ratio of the coils at each vertical distance may also be predetermined and stored in the electronic device, for example, in a memory of the electronic device.

[0226] S1604: The controller of the electronic device obtains the mutual inductance ratio corresponding to the coils using the output voltages of any two coils of the at least two coils.

[0227] Specifically, the controller obtains the error power by using the ratio of output voltages of any two coils of the at least two coils.

[0228] The principle of the method when the electronic device includes a receiving coil and a first auxiliary coil is first described below.

[0229] Continue to see Fig.10 At this time, S1604 specifically uses the ratio of the output voltage of the receiving coil and the output voltage of the first auxiliary coil to obtain the error power.

[0230] The output voltage of the coil is an AC voltage. In some embodiments, the corresponding error power can be obtained according to the ratio of the peak values ​​of the output voltages of the two coils or the ratio of the effective values ​​of the output voltages of the two coils. The embodiments of the present application do not specifically limit this.

[0231] Furthermore, the electronic device also includes a first rectifier connected to the receiving coil, and a second rectifier connected to the first auxiliary coil.

[0232] At this time, S1604 specifically obtains the error power according to the ratio of the first output voltage of the first rectifier to the second output voltage of the second rectifier.

[0233] In some embodiments, since the current output by the receiving coil needs to charge the battery, a voltage drop will be generated when the load current flows through the receiving coil L2, capacitor C2 and the first rectifier of the electronic device, thereby affecting the accuracy of the first output voltage of the first rectifier. Therefore, in order to compensate for the error caused by the load current to the voltage, the equivalent resistance of the receiving coil L2, capacitor C2 and the first rectifier of the electronic device is represented by Requ, and the output current of the electronic device is Iout. Then, the first output voltage V1 of the first rectifier can also be compensated by Requ and Iout to obtain the compensated output voltage V1'.

[0234] Among them, V1'=V1+Requ×Iout.

[0235] Then, the ratio of the compensated voltage V1 ′ to the second voltage V2 is obtained.

[0236] The principle of the method is described below when the electronic device includes a receiving coil, a first auxiliary coil and a second receiving coil.

[0237] Continue to see Fig.14 At this time, S1604 specifically uses the ratio of the output voltage of the first auxiliary coil to the output voltage of the second auxiliary coil to obtain the error power.

[0238] The output voltage of the coil is an AC voltage. In some embodiments, the corresponding error power can be obtained according to the ratio of the peak values ​​of the output voltages of the two coils or the ratio of the effective values ​​of the output voltages of the two coils. The embodiments of the present application do not specifically limit this.

[0239] Furthermore, the electronic device also includes a first rectifier connected to the receiving coil, a second rectifier connected to the first auxiliary coil, and a third rectifier connected to the second auxiliary coil.

[0240] At this time, S1604 specifically obtains the error power according to the ratio of the output voltage of the second rectifier to the output voltage of the third rectifier.

[0241] S1605: The controller of the electronic device uses the mutual inductance ratio to determine the error power according to the fitting equation of the mutual inductance ratio obtained in S1603.

[0242] S1606: The controller of the electronic device uses the mutual inductance ratio to determine the horizontal position offset length between the current electronic device and the wireless charger according to the corresponding relationship between the mutual inductance ratio and the horizontal position offset length acquired in S1603.

[0243] S1607: The controller of the electronic device sends the horizontal position offset to the display screen for display.

[0244] Continue to see Fig.13 When the electronic device 01 includes a display screen, the horizontal position offset can also be sent to the display screen for display, so as to prompt that the relative position of the electronic device and the wireless charger needs to be corrected. In addition, in some embodiments, when the controller controls the display screen to display the horizontal position offset, it can further control the electronic device to prompt by vibration, voice, ringtone, etc.

[0245] The signal light on the wireless charger 02 is used to give a prompt when a horizontal position deviation occurs. The signal light can also be used to give a prompt when the controller of the wireless charger (i.e., the transmitter controller) determines that there is a metal foreign body between the transmitting coil and the receiving coil.

[0246] S1608: The controller of the electronic device obtains the compensated output power from the output power and the error power, and sends the compensated output power to the transceiver.

[0247] The error power is represented by △P, the output power is represented by Pout, and the compensated output power Prx=Pout+△P.

[0248] S1609: The transceiver of the electronic device sends the compensated output power Prx to the wireless charger, so that the wireless charger obtains the power loss according to the input power and the compensated output power.

[0249] The input power is represented by Pin, and the power loss Ploss = Pin-Prx.

[0250] It can be understood that the above step division and sequence are only for the convenience of explanation and do not constitute a limitation on the method described in the present application. The above steps can be appropriately adjusted and replaced in some embodiments.

[0251] In summary, the method provided in the embodiment of the present application utilizes the coil coupling relationship between any two coils of the electronic device and the transmitting coil to obtain the error power, that is, when only one auxiliary coil is included, the error power can be obtained by utilizing the coil coupling relationship between the receiving coil and the auxiliary coil and the transmitting coil respectively; when two auxiliary coils are included, the error power can be obtained by utilizing the coil coupling relationship between the two auxiliary coils and the transmitting coil respectively, and the error power characterizes the power loss caused by the horizontal position offset between the transmitting coil and the receiving coil, and the error power is positively correlated with the ratio. The compensated output power is obtained from the output power and the error power, and the compensated output power is sent to the transceiver, and then sent to the wireless charger by the transceiver, so that the wireless charger obtains the power loss according to the input power and the compensated output power. At this time, the power loss caused by the horizontal position offset between the transmitting coil and the receiving coil in the power loss has been compensated. Therefore, when performing metal foreign body detection, the loss caused by the horizontal position offset between the transmitting coil and the receiving coil will not be identified as caused by the metal foreign body, thereby avoiding the erroneous judgment that there is a metal foreign body between the transmitting coil and the receiving coil when there is no metal foreign body between the transmitting coil and the receiving coil but there is a horizontal position offset, thereby improving the accuracy of metal foreign body detection.

[0252] System Example:

[0253] Based on the electronic device provided in the above embodiments, the embodiments of the present application further provide a wireless charging system, which will be described in detail below with reference to the accompanying drawings.

[0254] See also Fig.17 , which is a schematic diagram of a wireless charging system provided in an embodiment of the present application.

[0255] The wireless charging system 03 includes a wireless charger 02 and an electronic device 01 .

[0256] The wireless charger 02 includes a power supply, a transmitter controller, an inverter, a transmitter transceiver, a matching capacitor and a transmitter coil.

[0257] The electronic device 01 includes a receiving coil, at least one auxiliary coil, a matching capacitor, a rectifier, a receiving end controller, a receiving end transceiver, a charging circuit and a battery.

[0258] The power supply can be Figure 1 The inverter is used to convert the DC power output by the power supply into AC power and then output it, so that the transmitting coil generates high-frequency AC power and emits an alternating magnetic field. The receiving coil outputs AC power after receiving the above-mentioned alternating magnetic field, and the rectifier converts the AC power into DC power and then inputs it into the charging circuit, and the charging circuit realizes charging of the battery.

[0259] The electronic device also includes a memory, and one or more computer programs, wherein the one or more computer programs are stored in the memory, and the one or more computer programs include instructions, which, when executed by the electronic device, enable the electronic device to perform the steps recorded in the above method embodiment.

[0260] The controller of the receiving end obtains the error power by using the coil coupling relationship between any two coils of the at least two coils of the receiving end and the transmitting coil, respectively. The coil coupling relationship includes any one of the following: coil mutual inductance, coil coupling coefficient, or voltage magnitude coupled by the coil in the electronic device from the transmitting coil; the coil mutual inductance is proportional to the output voltage of the coil in the electronic device; the coil coupling coefficient is proportional to the output voltage of the coil in the electronic device.

[0261] Specifically, the controller obtains the error power by using the ratio of the coil coupling relationship between any two coils of the at least two coils and the transmitting coil, and the error power and the ratio have a positive correlation.

[0262] The following description is made by taking the case where the coil coupling relationship is the coil mutual inductance as an example. When the coil coupling relationship is the other two relationships, the principles are similar and will not be described in detail in the embodiments of the present application.

[0263] The compensated output power is obtained from the output power and the error power, and the compensated output power is sent to the transceiver at the receiving end. The transceiver at the receiving end sends the compensated output power to the transceiver of the wireless charger, so that the controller of the wireless charger 02 obtains the power loss Ploss according to the input power Pin and the compensated output power Prx. When the power loss is greater than the preset power threshold, it is determined that there is a metal foreign body between the transmitting coil L1 and the receiving coil L2. Wherein, Ploss = Pin-Prx.

[0264] In some embodiments, the value of the preset power threshold is related to the output power. For example, see Table 3 in the above description. Different output powers correspond to different Ploss thresholds (ie, preset power thresholds).

[0265] The working principle of the controller of the electronic device can be found in the relevant description in the above embodiments, and the embodiments of the present application will not be repeated here.

[0266] The electronic device 01 may specifically be a mobile phone, a tablet computer, a computer with wireless transceiver function, a smart wearable product (e.g., a smart watch, a smart bracelet, a headset, etc.), a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, etc. The above electronic device may also be a wireless charging electric car, a wireless charging household appliance (e.g., a soymilk machine, a sweeping robot), a drone, and other electronic products.

[0267] The wireless charger 02 corresponds to the electronic device 01. For example, when the electronic device 01 is a mobile phone, the wireless charger 02 can be a flat mobile phone wireless charger or a vertical mobile phone wireless charger. Figure 1 shown.

[0268] When there is a horizontal position offset between the transmitting coil of the wireless charger and the receiving coil of the electronic device and there is no metal foreign matter, the power loss between the transmitting coil and the receiving coil is caused by the horizontal position offset between the transmitting coil and the receiving coil. The receiving coil and the auxiliary coil of the electronic device have different mutual inductances to the transmitting coil. The corresponding relationship between the ratio of the mutual inductances corresponding to the coils of the electronic device and the horizontal position offset can be measured and determined in advance, and the power loss caused by the horizontal position offset can be measured and determined in advance, and then the error power caused by the horizontal position offset can be determined by the ratio of the mutual inductances corresponding to the coils of the electronic device, and the induced voltage of the coil of the electronic device is proportional to the corresponding mutual inductance. Therefore, the ratio of the corresponding mutual inductances between the coils of the electronic device can be obtained through the output voltage of the coil of the electronic device.

[0269] In summary, the controller of the electronic device of the wireless charging system can obtain the error power according to the coil coupling relationship between any two coils and the transmitting coil, that is, when only one auxiliary coil is included, the error power can be obtained by using the coil coupling relationship between the receiving coil and the auxiliary coil and the transmitting coil respectively; when two auxiliary coils are included, the error power can be obtained by using the coil coupling relationship between the two auxiliary coils and the transmitting coil respectively, and the error power represents the power loss caused by the horizontal position offset between the transmitting coil and the receiving coil, and the error power is positively correlated with the ratio. The controller obtains the compensated output power from the output power and the error power, and sends the compensated output power to the wireless charger, so that the wireless charger obtains the power loss according to the input power and the compensated output power. At this time, the power loss caused by the horizontal position offset between the transmitting coil and the receiving coil in the power loss has been compensated.

[0270] Therefore, when detecting metal foreign bodies, the horizontal position offset between the transmitting coil and the receiving coil will not be considered as a loss caused by metal foreign bodies, avoiding the erroneous judgment that there is a metal foreign body between the transmitting coil and the receiving coil when there is no metal foreign body between the transmitting coil and the receiving coil but there is a horizontal position offset, thereby improving the accuracy of metal foreign body detection. In addition, when the receiving coil and the auxiliary coil are arranged in the same plane, the thickness of the coil module will not be increased, and it is also convenient for electronic equipment to be thin and light, and it is highly practical.

[0271] The transmitter controller and the receiver controller described in the embodiment of the present application can be an application-specific integrated circuit (ASIC), a programmable logic device (PLD) or a combination thereof. The above-mentioned PLD can be a complex programmable logic device (CPLD), a field-programmable gate array (FPGA), a generic array logic (GAL) or any combination thereof, which is not specifically limited in the embodiment of the present application.

[0272] It should be understood that in the present application, "at least one (item)" means one or more, and "plurality" means two or more. "And / or" is used to describe the association relationship of associated objects, indicating that three relationships may exist. For example, "A and / or B" can mean: only A exists, only B exists, and A and B exist at the same time, where A and B can be singular or plural. The character " / " generally indicates that the objects associated before and after are in an "or" relationship. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single or plural items. For example, at least one of a, b or c can mean: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, c can be single or multiple.

[0273] The above is only a preferred embodiment of the present application and does not constitute any formal limitation to the present application. Although the present application has been disclosed as above with a preferred embodiment, it is not intended to limit the present application. Any technician familiar with the art can make many possible changes and modifications to the technical solution of the present application using the methods and technical contents disclosed above without departing from the scope of the technical solution of the present application, or modify it into an equivalent embodiment of equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application still fall within the scope of protection of the technical solution of the present application.

Claims

1. An electronic device, characterized in that: include: a controller, a transceiver, and at least two coils; The at least two coils include a receiving coil and one or more auxiliary coils; The receiving coil is used to couple the electric energy of the transmitting coil of the wireless charger to charge the battery in the electronic device; The auxiliary coil is used to compensate for the error power caused by the horizontal position offset between the electronic device and the wireless charger; The controller is used to obtain the error power by using the ratio of the coil coupling relationship between any two coils of the at least two coils and the transmitting coil, wherein the error power and the ratio have a positive correlation; obtain the compensated output power by using the output power of the charging circuit in the electronic device and the error power, and send the compensated output power to the transceiver; The transceiver is used to send the compensated output power to the wireless charger, so that the wireless charger obtains the power loss according to the input power of the wireless charger and the compensated output power.

2. The electronic device according to claim 1, characterized in that: The coil coupling relationship includes any one of the following: coil mutual inductance, coil coupling coefficient, or voltage magnitude coupled by the coil in the electronic device from the transmitting coil; the coil mutual inductance is proportional to the output voltage of the coil in the electronic device; the coil coupling coefficient is proportional to the output voltage of the coil in the electronic device.

3. The electronic device according to claim 1, characterized in that: The at least two coils include: a receiving coil and a first auxiliary coil; The controller is used to obtain error power by using the ratio of the coil coupling relationship between any two coils of the at least two coils and the transmitting coil, specifically including: The controller obtains error power by using the ratio of the output voltage of the receiving coil and the output voltage of the first auxiliary coil.

4. The electronic device according to claim 1, characterized in that: The at least two coils include: a receiving coil and a first auxiliary coil, and the electronic device further includes: a first rectifier connected to the receiving coil, and a second rectifier connected to the first auxiliary coil; The controller is used to obtain error power by using the ratio of the coil coupling relationship between any two coils of the at least two coils and the transmitting coil, specifically including: The controller is used to obtain error power according to the ratio of the first output voltage of the first rectifier and the second output voltage of the second rectifier.

5. The electronic device according to claim 4, characterized in that: The controller is further used to compensate the first output voltage according to a preset impedance and the output current of the first rectifier, and obtain a ratio of the compensated voltage to the second output voltage.

6. The electronic device according to claim 1, characterized in that: The at least two coils include: a receiving coil, a first auxiliary coil and a second auxiliary coil; The controller is used to obtain error power by using the ratio of the coil coupling relationship between any two coils of the at least two coils and the transmitting coil, specifically including: The controller is used to obtain error power by using the ratio of the output voltage of the first auxiliary coil to the output voltage of the second auxiliary coil.

7. The electronic device according to claim 1, characterized in that: The at least two coils include: a receiving coil, a first auxiliary coil and a second auxiliary coil, and the electronic device further includes: a first rectifier connected to the receiving coil, a second rectifier connected to the first auxiliary coil and a third rectifier connected to the second auxiliary coil; The controller is used to obtain error power by using the ratio of the coil coupling relationship between any two coils of the at least two coils and the transmitting coil, specifically including: The controller is used to obtain error power according to the ratio of the output voltage of the second rectifier to the output voltage of the third rectifier.

8. The electronic device according to any one of claims 1 to 7, characterized in that: The receiving coil and the auxiliary coil are located in the same plane.

9. The electronic device according to any one of claims 1 to 7, characterized in that: The center of the receiving coil coincides with the center of the auxiliary coil.

10. The electronic device according to claim 1, characterized in that: The positions of the receiving coil and the auxiliary coil are any of the following: The auxiliary coil is located at the radial inner periphery of the receiving coil, the auxiliary coil is located at the radial outer periphery of the receiving coil, and different parts of the auxiliary coil are respectively located at the radial inner periphery and radial outer periphery of the receiving coil.

11. The electronic device according to claim 1, characterized in that: The auxiliary coil comprises at least two of the following: a first auxiliary coil and a second auxiliary coil; The positions of the receiving coil and the auxiliary coil are any of the following: The first auxiliary coil and the second auxiliary coil are both located at the radial inner periphery of the receiving coil, the first auxiliary coil and the second auxiliary coil are both located at the radial outer periphery of the receiving coil, and the first auxiliary coil and the second auxiliary coil are respectively located at the radial inner periphery and radial outer periphery of the receiving coil.

12. The electronic device according to any one of claims 1 to 7, characterized in that: The auxiliary coil has one turn or multiple turns; When the auxiliary coil has multiple turns, the ends of the multiple turns of the auxiliary coil are connected in parallel or in series.

13. The electronic device according to any one of claims 1 to 7, characterized in that: The controller is further used to obtain a horizontal position offset between the transmitting coil and the receiving coil according to the ratio, and the ratio is positively correlated with the horizontal position offset.

14. The electronic device according to claim 12, characterized in that: Also includes: Display screen; The controller is further configured to send the horizontal position offset to the display screen for display.

15. The electronic device according to any one of claims 1 to 7, characterized in that: The controller is further used to obtain a vertical distance between the electronic device and the wireless charger, and obtain the corresponding comparison relationship according to the vertical distance.

16. A power compensation method, characterized in that: An electronic device applied to wireless charging, the electronic device comprising: a memory, a controller and at least two coils; the at least two coils include a receiving coil and one or more auxiliary coils; and one or more computer programs, wherein the one or more computer programs are stored in the memory, and the one or more computer programs include instructions, and when the instructions are executed by the electronic device, the electronic device performs the following steps: The error power is obtained by using the ratio of the coil coupling relationship between any two coils of the at least two coils and the transmitting coil; the error power and the ratio have a positive correlation relationship; Obtaining a compensated output power from the output power of the charging circuit in the electronic device and the error power; The compensated output power is sent to the wireless charger, so that the wireless charger obtains the power loss according to the input power of the wireless charger and the compensated output power.

17. The method according to claim 16, characterized in that The coil coupling relationship includes any one of the following: coil mutual inductance, coil coupling coefficient, or voltage magnitude coupled by the coil in the electronic device from the transmitting coil; the coil mutual inductance is proportional to the output voltage of the coil in the electronic device; the coil coupling coefficient is proportional to the output voltage of the coil in the electronic device.

18. The method according to claim 16, characterized in that When the at least two coils include: a receiving coil and a first auxiliary coil, obtaining the error power by using the ratio of the coil coupling relationship between any two coils of the at least two coils and the transmitting coil, specifically includes: The error power is obtained by using the ratio of the output voltage of the receiving coil to the output voltage of the first auxiliary coil.

19. The method according to claim 16, characterized in that The at least two coils include: a receiving coil and a first auxiliary coil, and the electronic device further includes: a first rectifier connected to the receiving coil, and a second rectifier connected to the first auxiliary coil; The step of obtaining the error power by using the ratio of the coil coupling relationship between any two coils of the at least two coils and the transmitting coil includes: The error power is obtained according to the ratio of the first output voltage of the first rectifier to the second output voltage of the second rectifier.

20. The method according to claim 19, characterized in that The method further includes: obtaining a compensation voltage according to a preset impedance and a current of the receiving coil, compensating the first output voltage using the compensation voltage, and obtaining a ratio of the compensated voltage to the second output voltage.

21. The method according to claim 16, characterized in that The at least two coils include: a receiving coil, a first auxiliary coil and a second auxiliary coil; The step of obtaining the error power by using the ratio of the coil coupling relationship between any two coils of the at least two coils and the transmitting coil includes: The error power is obtained by using the ratio of the output voltage of the first auxiliary coil to the output voltage of the second auxiliary coil.

22. The method according to claim 16, characterized in that The at least two coils include: a receiving coil, a first auxiliary coil and a second auxiliary coil, and the electronic device further includes: a first rectifier connected to the receiving coil, a second rectifier connected to the first auxiliary coil and a third rectifier connected to the second auxiliary coil; The step of obtaining the error power by using the ratio of the coil coupling relationship between any two coils of the at least two coils and the transmitting coil includes: The error power is obtained according to the ratio of the output voltage of the second rectifier to the output voltage of the third rectifier.

23. The method according to any one of claims 16 to 22, characterized in that: The method further includes: obtaining a horizontal position offset between the transmitting coil and the receiving coil according to the ratio, wherein the ratio is positively correlated with the horizontal position offset.

24. The method according to claim 23, characterized in that The electronic device further comprises: a display screen; The method also includes: sending the horizontal position offset to the display screen for display.

25. The method according to any one of claims 16 to 22, characterized in that: The method further includes: obtaining a vertical distance between the electronic device and the wireless charger, and obtaining the corresponding control relationship according to the vertical distance.

26. A wireless charging system, characterized in that: Comprising a wireless charger and the electronic device according to any one of claims 1 to 15; The wireless charger comprises: a transmitting coil; The transmitting coil is used to transmit electric energy to the receiving coil to wirelessly charge the electronic device.

27. The system according to claim 26, characterized in that The wireless charger comprises: a transmitter controller; The transmitting end controller is used to obtain power loss according to input power and the compensated output power, and when the power loss is greater than a preset power threshold, determine that there is a metal foreign body between the transmitting coil and the receiving coil.

28. The system according to claim 26, characterized in that The wireless charger also includes a signal light; The signal light is used to provide a prompt when the transmitter controller determines that there is a metal foreign object between the transmitter coil and the receiver coil, or when there is a horizontal position offset between the transmitter coil and the receiver coil.

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