CN113541279A

CN113541279A - Electronic equipment, method and wireless charging system

Info

Publication number: CN113541279A
Application number: CN202010305431.4A
Authority: CN
Inventors: 裴昌盛
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2020-04-17
Filing date: 2020-04-17
Publication date: 2021-10-22
Also published as: WO2021208621A1

Abstract

The application discloses electronic equipment, a method and a wireless charging system, and relates to the technical field of wireless charging. The apparatus 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 is coupled with the electric energy of the transmitting coil of the wireless charger to charge the battery. The auxiliary coil compensates for power loss caused by horizontal position offset between the electronic device and the wireless charger. The controller obtains error power by utilizing the coupling relation between any two coils and the coils of the transmitting coil, obtains compensated output power by the output power and the error power, and sends the compensated output power to the transceiver. And the transceiver sends the compensated output power to the wireless charger, so that the wireless charger obtains power loss according to the input power and the compensated output power. The device is capable of compensating for power loss due to a horizontal position offset between the electronic device and the wireless charger.

Description

Electronic equipment, method and wireless charging system

Technical Field

The present application relates to the field of wireless charging technologies, and in particular, to an electronic device, a method, and a wireless charging system.

Background

Wireless Charging Technology (WCT) utilizes a conductive medium such as an electric field, a magnetic field, microwaves or laser to realize wireless transmission of electric energy, and is now applied to electronic devices more and more widely due to its advantages such as no wire limitation and no plugging.

The wireless charging system applies a wireless charging technology and comprises electronic equipment and a wireless charger, and the wireless charger wirelessly charges the electronic equipment. If a metal foreign object exists 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) occurs, and if the power loss exceeds a set threshold, the wireless charger interrupts power transmission.

However, when the current electronic device, such as a mobile phone and a smart watch, is charged wirelessly, power loss may occur in power transmission between the electronic device and the wireless charger, the power loss may be caused by the presence of a metal foreign object, or may be caused by a horizontal position offset of a power transmission coil module between the electronic device and the wireless charger, and if the power loss exceeds a set threshold, the wireless charger interrupts power transmission.

Disclosure of Invention

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 power loss caused by a horizontal position offset between a receiving coil of the electronic device and a transmitting coil of a wireless charger.

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 for coupling electric energy of a transmitting coil of a wireless charger to charge a battery in the electronic equipment; the auxiliary coil is used to compensate for power loss caused by horizontal position offset between the electronic device and the wireless charger. The controller obtains error power by using the coupling relation between any two coils of the at least two coils and the coils of the transmitting coil, obtains compensated output power by the output power and the error power of the charging circuit in the electronic equipment, and sends the compensated output power to the transceiver. And the transceiver sends the compensated output power to the wireless charger, so that the wireless charger obtains power loss according to the input power and the compensated output power of the wireless charger. The charging circuit is a circuit inside the electronic device, and is used for charging the battery.

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 using the coil coupling relationship of the two auxiliary coils with the transmitting coil, respectively.

When magnetic field energy is coupled, the coupling relation between the coil for transmitting energy and the coil for receiving energy determines the magnitude of voltage coupled to the coil for receiving energy, generally, the coil coupling relation can be represented by a coil coupling coefficient or coil mutual inductance, and the coil mutual inductance is proportional to the voltage coupled to the coil for receiving energy, so that the magnitude of the voltage coupled to the coil for receiving energy can also represent the coil coupling relation to a certain extent. In the embodiment of the present application, the error power is obtained by using the ratio of the coil coupling relationship, and in some embodiments, the error power may also be obtained by using the ratio of the coil coupling voltage for receiving energy.

With the electronic device, power loss due to a horizontal position offset between a receiving coil of the electronic device and a transmitting coil of the wireless charger can be compensated. In addition, when the metal foreign matter is detected, the loss caused by the metal foreign matter due to the horizontal position offset between the transmitting coil and the receiving coil cannot be determined, the metal foreign matter is prevented from being mistakenly judged to exist between the transmitting coil and the receiving coil when no metal foreign matter exists between the transmitting coil and the receiving coil but the horizontal position offset exists, and therefore the accuracy of metal foreign matter detection is improved.

With reference to the first aspect, in a first possible implementation manner, the coil coupling relationship includes any one of: coil mutual inductance, coil coupling coefficient, or the magnitude of voltage that a coil in an electronic device couples from a transmitting coil. The mutual inductance of the coil is proportional to the output voltage of the coil in the electronic device, and the coupling coefficient of the coil is proportional to the output voltage of the coil in the electronic device. Therefore, the ratio of the output voltages of the coils in the electronic device can be used for representing the ratio of the mutual coil inductance or the ratio of the coil coupling coefficient of the coil of the electronic device and the coil of the transmitting coil respectively.

With reference to the first aspect, in a second possible implementation manner, the controller obtains the error power by using a coil coupling relationship between any two coils of the at least two coils and the transmitting coil, specifically: the controller obtains error power from the ratio of the coupling relationship between any two coils of the at least two coils and the coils of the transmitting coil, and the error power and the ratio have a positive correlation contrast relationship.

With reference to 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 error power by using a ratio of respective coil coupling relations between any two coils of the at least two coils and the transmitting coil, and specifically includes: the controller obtains the error power by using the ratio of the output voltage of the receiving coil and the output voltage of the first auxiliary coil.

At the moment, an auxiliary coil is added on the electronic equipment, and the auxiliary coil and a receiving coil of the electronic equipment are utilized to realize compensation of power loss caused by horizontal position offset between the electronic equipment and the wireless charger.

With reference to the first aspect, in a fourth possible implementation manner, the at least two coils include: the electronic equipment also comprises a first rectifier connected with the receiving coil and a second rectifier connected with the first auxiliary coil. The controller is used for obtaining error power by utilizing the ratio of the coupling relationship between any two coils of the at least two coils and the coil of the transmitting coil, and specifically comprises the following steps: the controller is used for obtaining 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 the moment, the output voltage of the rectifier is direct-current voltage, so that the collection is convenient.

With reference to the first aspect, in a fifth possible implementation manner, the controller is further configured 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.

Through compensating first output voltage, the influence of the impedance of enough reduction electronic equipment to error power for the output power after the compensation that the receiving end controller obtained is more accurate, and then makes the power loss that the transmitting end controller obtained can be more accurate, consequently further promotes the precision that the metallic foreign object detected.

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

The first auxiliary winding and the second auxiliary winding of this implementation are not used for charging the battery of the electronic device, i.e. 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 rectifiers.

With reference to the first aspect, in a seventh possible implementation manner, the at least two coils include: the electronic equipment further comprises a first rectifier connected with the receiving coil, a second rectifier connected with the first auxiliary coil and a third rectifier connected with the second auxiliary coil. The controller obtains the error power by using a ratio of the coupling relationship between any two coils of the at least two coils and the coils of the transmitting coil, and specifically includes: the controller obtains error power according to the ratio of the output voltage of the second rectifier and the output voltage of the third rectifier. At the moment, the output voltage of the rectifier is direct-current voltage, so that the collection is convenient.

With reference to the first aspect and any one of the foregoing possible implementation manners, in an eighth possible implementation manner, the receiving coil and the auxiliary coil are located on the same plane, so that the thickness of the coil module is not increased by providing the auxiliary coil.

With reference to the first aspect and any one of the foregoing possible implementation manners, in a ninth possible implementation manner, a center of the receiving coil coincides with a center of the auxiliary coil, so as to facilitate accurate determination of horizontal position offset of the receiving coil and the transmitting coil.

With reference to the first aspect and any one of the foregoing possible implementation manners, in a tenth possible implementation manner, the positions of the receiving coil and the auxiliary coil are any one of the following: the auxiliary coil is located at a radially inner periphery of the receiving coil, the auxiliary coil is located at a radially outer periphery of the receiving coil, and different portions of the auxiliary coil are located at the radially inner periphery and the radially outer periphery of the receiving coil respectively.

With reference to the first aspect and any one of the foregoing possible implementations, in an eleventh possible implementation, the auxiliary coil includes at least two of: a first auxiliary coil and a second auxiliary coil. The position of the receiving coil and the auxiliary coil is any one of the following positions: the first auxiliary coil and the second auxiliary coil are both located on the radial inner periphery of the receiving coil, the first auxiliary coil and the second auxiliary coil are both located on the radial periphery of the receiving coil, and the first auxiliary coil and the second auxiliary coil are respectively located on the radial inner periphery and the radial periphery of the receiving coil.

With reference to the first aspect and any one of the foregoing possible implementation manners, in a twelfth possible implementation manner, the auxiliary coil has one or more turns; when the auxiliary coil is multi-turn, the ends of the multi-turn coil are connected in parallel or in series.

With reference to the first aspect and any one of the foregoing possible implementation manners, in a thirteenth possible implementation manner, the controller is further configured to obtain a horizontal position offset between the transmitting coil and the receiving coil according to a ratio, where the ratio is positively correlated to the horizontal position offset.

With reference to the first aspect and any one of the foregoing possible implementation manners, in a fourteenth possible implementation manner, the electronic device further includes: a display screen. The controller is further used for sending the horizontal position offset to the display screen for displaying so as to prompt that the relative positions of the electronic equipment and the wireless charger need to be corrected at the moment. In addition, in some embodiments, when the controller controls the display screen to display the horizontal position deviation, the electronic device may be further controlled to prompt in a vibration mode, a voice mode, a ring mode, or the like.

With reference to the first aspect and any one of the foregoing possible implementation manners, in a fifteenth possible implementation manner, the controller is further configured to obtain a vertical distance between the electronic device and the wireless charger, and obtain the corresponding comparison relationship according to the vertical distance. This is because in practical applications, the vertical distance between the electronic device and the wireless charger may vary, for example, the electronic device may be mounted with protective cases having different thicknesses. And then, the corresponding comparison relation is obtained according to the current vertical distance, so that the corresponding error power can be more accurately obtained, and the compensation of the power loss caused by the horizontal position offset between the transmitting coil and the receiving coil is more accurate.

In some embodiments, the fitting equation of the mutual inductance ratio of the coils at different vertical distance values may 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 may obtain the vertical distance between the electronic device and the wireless charger, obtain the mutual inductance ratio corresponding to the coil by using the output voltage of the coil, and call the corresponding relationship between the mutual inductance ratio of the coil corresponding to the current vertical distance and the horizontal position offset length, and the fitting equation corresponding to the current vertical distance. The controller of the electronic equipment further acquires the horizontal position offset length corresponding to the current mutual inductance ratio according to the corresponding relation between the mutual inductance ratio of the coil and the horizontal position offset length, and acquires the stray loss corresponding to the current mutual inductance ratio according to a fitting equation, namely the power loss caused by the horizontal position offset between the receiving coil of the electronic equipment and the transmitting coil of the wireless charger is acquired.

In a second aspect, an embodiment of the present application further provides a power compensation method, where the method is applied to a wirelessly charged electronic device, and the electronic device includes: a memory, a controller, and at least two coils; the at least two coils comprise 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, the one or more computer programs comprising instructions which, when executed by the electronic device, cause the electronic device to perform the steps of:

obtaining error power according to the coil coupling relation between any two coils of the at least two coils and the transmitting coil;

obtaining compensated output power from the output power of the charging circuit in the electronic device and the error power;

and sending the compensated output power 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.

With this method, it is possible to compensate for power loss due to a horizontal position offset between the receiving coil of the electronic device and the transmitting coil of the wireless charger. In addition, when the metal foreign matter is detected, the loss caused by the metal foreign matter due to the horizontal position offset between the transmitting coil and the receiving coil cannot be determined, the metal foreign matter is prevented from being mistakenly judged to exist between the transmitting coil and the receiving coil when no metal foreign matter exists between the transmitting coil and the receiving coil but the horizontal position offset exists, and therefore the accuracy of metal foreign matter detection is improved.

With reference to the second aspect, in a first possible implementation manner, the coil coupling relationship includes any one of: a coil mutual inductance, a coil coupling coefficient, or a magnitude of a voltage that a coil in the electronic device couples from the transmit coil; the coil mutual inductance is proportional to an output voltage of a coil in the electronic device; the coil coupling coefficient is proportional to an output voltage of a coil in the electronic device.

With reference to the second aspect, in a second possible implementation manner, obtaining the error power by using a coil coupling relationship between any two coils of the at least two coils and the transmitting coil respectively includes: and obtaining error power by utilizing the ratio of the 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 contrast relationship.

With reference to the second aspect, in a third possible implementation manner, when the at least two coils include the receiving coil and the first auxiliary coil, obtaining the error power by using a ratio of respective coil coupling relationships between any two coils of the at least two coils and the transmitting coil, specifically includes: and obtaining error power by using the ratio of the output voltage of the receiving coil and the output voltage of the first auxiliary coil.

With reference to the second aspect, in a fourth possible implementation manner, 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 error power by using a ratio of respective coil coupling relations between any two coils of the at least two coils and the transmitting coil, specifically comprising: error power is obtained according to a ratio of a first output voltage of the first rectifier and a second output voltage of the second rectifier.

With reference to the second aspect, in a fifth possible implementation manner, the method further includes: and obtaining a compensation voltage according to a preset impedance and the current of the receiving coil, and compensating the first output voltage by using the compensation voltage to obtain the ratio of the compensated voltage to the second voltage. And then can reduce the influence of the impedance of electronic equipment to the error power for the output power after the compensation that the receiving end controller obtained is more accurate, and then makes the power loss that the transmitting end controller obtained can be more accurate.

With reference to the second aspect, in a sixth possible implementation manner, the at least two coils include: the receiving coil, the first auxiliary coil and the second auxiliary coil. Obtaining error power by using a ratio of respective coil coupling relations between any two coils of the at least two coils and the transmitting coil, specifically comprising: and obtaining error power by using the ratio of the output voltage of the first auxiliary coil and the output voltage of the second auxiliary coil.

With reference to the second aspect, in a seventh possible implementation manner, the at least two coils include: receiving coil, first auxiliary coil and second auxiliary coil, the electronic equipment still includes: the first rectifier is connected with the receiving coil, the second rectifier is connected with the first auxiliary coil, and the third rectifier is connected with the second auxiliary coil. Obtaining error power by using a ratio of respective coil coupling relations between any two coils of the at least two coils and the transmitting coil, specifically comprising: and obtaining error power according to the ratio of the output voltage of the second rectifier and the output voltage of the third rectifier. At this moment, the output voltage of the rectifier is direct current voltage, so that detection and acquisition are facilitated.

With reference to 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.

With reference to the second aspect, in a ninth possible implementation manner, the electronic device further includes: a display screen. The method further comprises the following steps: and sending the horizontal position offset to the display screen for displaying so as to prompt that the relative positions of the electronic equipment and the wireless charger need to be corrected at the moment. .

With reference to the second aspect, in a tenth possible implementation manner, the method further includes: and obtaining the vertical distance between the electronic equipment and the wireless charger, and obtaining the corresponding contrast relation according to the vertical distance.

In a third aspect, an embodiment of the present application further provides a wireless charging system, which includes a wireless charger and the electronic device described above. The wireless charger includes: and a transmitting coil. The transmitting coil is used for transmitting electric energy to the receiving coil to wirelessly charge the electronic equipment.

With the wireless charging system, power loss caused by 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 the metal foreign matter is detected, the loss caused by the metal foreign matter due to the horizontal position offset between the transmitting coil and the receiving coil cannot be determined, the metal foreign matter is prevented from being mistakenly judged to exist between the transmitting coil and the receiving coil when no metal foreign matter exists between the transmitting coil and the receiving coil but the horizontal position offset exists, and therefore the accuracy of metal foreign matter detection is improved.

With reference to the third aspect, in a first possible implementation manner, a wireless charger includes: and a transmitting end controller. And the transmitting terminal controller obtains power loss according to the input power and the compensated output power, and when the power loss is greater than a preset power threshold value, the transmitting terminal controller determines that a metal foreign matter exists between the transmitting coil and the receiving coil.

With reference to the third aspect, in a second possible implementation manner, the wireless charger further includes a signal lamp. The signal lamp is used for prompting when the transmitting end controller determines that a metal foreign body exists between the transmitting coil and the receiving coil or when a horizontal position offset exists between the transmitting coil and the receiving coil.

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;

the at least two coils comprise a receiving coil and one or more auxiliary coils;

the receiving coil is used for coupling electric energy of a transmitting coil of a wireless charger to charge a battery in the electronic equipment;

the auxiliary coil is used for compensating power loss caused by horizontal position offset between the electronic equipment and the wireless charger;

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

the transceiver is used for sending the output power and the error power to the wireless charger, so that the wireless charger obtains power loss according to the input power of the wireless charger, the output power of a charging circuit in the electronic equipment and the error power.

The scheme provided by the application has at least the following advantages:

the electronic device comprises at least two coils, wherein one coil is a receiving coil, and the rest coils are auxiliary coils. When there is a horizontal position offset between the wireless charger and the electronic device and there is no metallic foreign object, power loss between the wireless charger and the electronic device is due to the horizontal position offset. Due to the existence of the horizontal position deviation, the coupling relationship between the transmitting coil for transmitting the energy by the wireless charger and the receiving coil for receiving the energy in the electronic equipment is changed, so that an auxiliary coil is added in the electronic equipment, and the error power caused by the horizontal position deviation is obtained by utilizing the coil coupling relationship between two different coils in the electronic equipment and the transmitting coil respectively. For example, when only one auxiliary coil is included, the error power can be obtained by using the coil coupling relationship of the receiving coil and the auxiliary coil with the transmitting coil, respectively; when two auxiliary coils are included, the error power can be obtained by using the coil coupling relationship of the two auxiliary coils with the transmitting coil, respectively. This error power characterizes the power loss caused by the horizontal position offset between the transmit coil and the receive coil. The controller obtains compensated output power according to the output power and the error power, sends the compensated output power to the transceiver, and then sends the compensated output power to the wireless charger through the transceiver, so that the wireless charger obtains power loss according to the input power and the compensated output power. The power loss caused by the horizontal position offset between the transmitting coil and the receiving coil is already compensated for in this case.

In summary, with the electronic device provided in the present application, power loss caused by a 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 the metal foreign matter is detected, the loss caused by the metal foreign matter due to the horizontal position offset between the transmitting coil and the receiving coil cannot be determined, the metal foreign matter is prevented from being mistakenly judged to exist between the transmitting coil and the receiving coil when no metal foreign matter exists between the transmitting coil and the receiving coil but the horizontal position offset exists, and therefore the accuracy of metal foreign matter detection is improved.

Drawings

Fig. 1 is a schematic diagram of a wireless charging system provided in the present application;

FIG. 2 is a diagram illustrating the structure of the electronic device of FIG. 1;

fig. 3 is a schematic diagram of another wireless charging system provided herein;

fig. 4 is a schematic view of a wireless charging system corresponding to an electronic device according to an embodiment of the present disclosure;

FIG. 5 is a graph showing the distribution of loss for each portion as a function of horizontal position offset length;

FIG. 6 is a graph illustrating stray loss versus horizontal offset length according to an embodiment of the present disclosure;

FIG. 7 is a schematic diagram of a first embodiment of the present disclosure;

FIG. 8 is a graph illustrating the mutual inductance ratio provided by an embodiment of the present application;

FIG. 9 is a graph illustrating a mutual inductance ratio versus an error power according to an embodiment of the present application;

fig. 10 is a schematic view of a wireless charging system corresponding to another electronic device according to an embodiment of the present disclosure;

fig. 11 is a schematic diagram of a coil of an electronic device according to an embodiment of the present disclosure;

fig. 12A is a schematic diagram of a coil of another electronic device provided in an embodiment of the present application;

fig. 12B is a schematic diagram of a coil of another electronic device provided in the embodiment of the present application;

FIG. 13 is a schematic diagram illustrating a horizontal position offset according to an embodiment of the present disclosure;

fig. 14 is a schematic view of a wireless charging system corresponding to another electronic device according to an embodiment of the present disclosure;

fig. 15 is a schematic diagram of a coil of another electronic device according to an embodiment of the present application;

fig. 16 is a schematic diagram of a power compensation method according to an embodiment of the present application;

fig. 17 is a schematic diagram of a wireless charging system according to an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments.

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

Further, in the present application, directional terms such as "upper", "lower", and the like may include, but are not limited to, being defined relative to a schematically-disposed orientation of components in the drawings, it being understood that these directional terms may be relative concepts that are intended for relative description and clarification, and that will vary accordingly depending on the orientation of the components in the drawings in which they are disposed.

In the present application, unless expressly stated or limited otherwise, the term "coupled" is to be construed broadly, e.g., "coupled" may be a fixed connection, a removable connection, or an integral part; may be directly connected or indirectly connected through an intermediate. Furthermore, the term "coupled" may be a manner of making electrical connections that communicate signals. "coupled" may be a direct electrical connection or an indirect electrical connection through intervening media.

The embodiment of the application does not specifically limit the type of the electronic device, and the electronic device may be a mobile phone (mobile phone), a tablet computer (pad), a computer with a wireless transceiving function, an intelligent wearable product (e.g., a smart watch, a smart bracelet, an earphone, etc.), a Virtual Reality (VR) terminal device, an augmented reality (augmented reality) terminal device, etc. and has a wireless device. The electronic equipment can also be electronic products such as a wireless charging electric automobile, a wireless charging household appliance (such as a soybean milk machine and a sweeping robot), an unmanned aerial vehicle and the like.

For convenience of description, the following description will be made by taking an electronic device as a mobile phone as an example to illustrate the implementation principle of wireless charging.

Referring to fig. 1, the figure is a schematic diagram of a wireless charging system provided in the present application.

The wireless charger 02 is used for wirelessly charging the electronic device 01 (i.e., a mobile phone). The wireless charger 02 is shown to support the electronic device 01 horizontally above, and in some embodiments, the wireless charger 02 may have other shapes, such as a vertical wireless charger with a certain inclination, so that the electronic device 01 can lean against the wireless charger 02.

The wireless charging system includes a wireless charging Receiving (RX) device 20 disposed in the electronic device 01 and a battery 50 coupled to the RX device 20.

The wireless charging system further includes a wireless charging Transmit (TX) device 30 disposed in the wireless charger 02, and an adapter 40 coupled to the wireless charging transmit device 30, wherein the adapter 40 is used for providing charging power.

The Wireless charging transmitter 30 transmits power to the Wireless charging receiver 20, and meanwhile, the Wireless charging transmitter 30 and the Wireless charging receiver 20 are wirelessly connected through Bluetooth (Bluetooth), Wireless broadband (WiFi), Zigbee (Zigbee), Radio Frequency Identification (RFID), Long range (Lora) or Near Field Communication (NFC), so that Wireless Communication can be established between the Wireless charging transmitter 30 and the Wireless charging receiver 20.

The control signal or the charging data may be transmitted between the wireless charging transmitting device 30 and the wireless charging receiving device 20. Wherein the charging data may be used to indicate the type of charging. In some embodiments, the charging data may be a charging protocol, such as wireless charging standard Qi (wireless power consortium, WPC), for example, bpp (basic power profile) protocol, epp (extended power profile) protocol, and the like.

Referring to fig. 2, the structure of the electronic device in fig. 1 is schematically illustrated.

Taking the above-mentioned electronic device 01 as a mobile phone as an example, it mainly includes a Display Panel (DP) 10. The display screen 10 may be a Liquid Crystal Display (LCD) screen, or an Organic Light Emitting Diode (OLED) display screen, and when the mobile phone adopts a folding screen architecture or a multi-screen architecture, the mobile phone may further include a plurality of screens, and the plurality of screens may also be a combination of the above different types of screens, which is not limited in this application.

The electronic device 01 may further include a middle frame 11 and a housing 12. The display screen 10 and the casing 12 are respectively located at two sides of the middle frame 11, the back of the display screen 10 faces the casing 12, and the display screen 10 and the casing 12 are connected through the middle frame 11. The middle frame 11 includes a supporting plate 110 and a frame 111 surrounding the supporting plate 110. The electronic device 01 may further include a Printed Circuit Board (PCB).

The operation principle of the wireless charging system is explained in detail below.

Referring to fig. 3, a schematic diagram of another wireless charging system provided herein is shown.

Fig. 3 shows a circuit schematic of a wireless charging system. The wireless charger 02 includes a power supply 30, a transmitting terminal controller 301, an inverter 302, a transmitting terminal transceiver 306, a matching capacitor C1, and a transmitting coil L1.

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.

The power supply 30 may be implemented by the adapter 40 in fig. 1.

The inverter 302 is configured to convert the dc power output from the power supply 30 into ac power and output the ac power, so that the transmitting coil L1 generates high-frequency ac power and transmits an ac magnetic field. The receiving coil L2 outputs an alternating current after receiving the alternating magnetic field, the rectifier 303 converts the alternating current into a direct current, and then inputs the direct current to the charging circuit 60, and the charging circuit 60 charges the battery 50.

The battery 50 may be a single battery, and in some embodiments, the electronic device may further include a plurality of batteries.

The control signal or the charging data may be transmitted between the receiving-end transceiver 305 and the transmitting-end transceiver 306.

The receiving-end transceiver 305 may be coupled to the receiving-end controller 304, and the receiving-end controller 304 may identify a charging protocol transmitted by the transmitting-end transceiver 306 to the receiving-end transceiver 305 to determine a charging type of the electronic device 01, for example, the charging type may be a first charging type (e.g., low-power charging suitable for slow charging) or the charging type may be a second charging type (e.g., high-power charging suitable for fast charging).

In the prior art, when the wireless charger 02 wirelessly charges the electronic device 01, if a metal foreign object exists between the receiving coil L2 and the transmitting coil L1, power loss (Ploss) occurs, and when the power loss exceeds a set threshold, the wireless charger 02 interrupts power transmission.

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

In order to solve the above technical problem, an embodiment of the present application provides an electronic device, where the electronic device includes at least two coils, one of the coils is a receiving coil, and the other coil is an auxiliary coil, and the auxiliary coil is added to compensate for a power loss caused by a horizontal position offset between the electronic device and a wireless charger.

In order to make the technical solutions of the present application more clearly understood by those skilled in the art, the technical solutions of the present application are described below with reference to the accompanying drawings.

The first embodiment is as follows:

referring to fig. 4, the figure is a schematic view of a wireless charging system corresponding to an electronic device according to an embodiment of the present disclosure.

The electronic device includes a controller (shown as a receiving end controller 304) and at least two coils.

The at least two coils include a receiving coil L2, and the rest are auxiliary coils, and fig. 4 illustrates that the electronic device includes an auxiliary coil, i.e., a first auxiliary coil L3.

In some embodiments, the electronic device may also include a plurality of auxiliary coils, as will be described in more detail in subsequent embodiments.

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

The principle of the controller to implement power loss compensation is first explained below.

With continued reference to the wireless charging system shown in fig. 4, now considering only the effect of the horizontal position offset between the transmit coil L1 and the receive coil L2 on the power loss, i.e., no metallic foreign object between the transmit coil L1 and the receive coil L2, the power loss between the transmit coil L1 and the receive coil L2 is due to the horizontal position offset between the transmit coil L1 and the receive coil L2.

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.

Table one: measuring meter with power loss changing along with horizontal position offset length

The first column of the table is horizontal position offset length, the unit is millimeter mm, and the first table is comprehensively analyzed, so that other types of losses except the stray loss of the fifth column can be found, and the amplitude of the loss along with the change of the horizontal position offset length is small. The stray loss is obviously increased along with the increase of the horizontal position offset length, namely, the stray loss and the horizontal position offset have a positive correlation relationship.

Referring to fig. 5, a graph is shown illustrating the distribution of loss of each corresponding portion as a function of horizontal offset length.

From this power loss profile, it can be more intuitively seen that the increase in stray loss is significant as the horizontal offset length between the transmit coil L1 and the receive coil L2 increases. Stray losses include the sum of eddy current losses in the conductor, losses in the magnetic shielding material, and losses due to other causes.

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 object, a significant stray loss occurs, which results in an increase in power loss.

The accuracy of detecting the metal foreign matter depends on the calculation accuracy of power loss (Ploss), when no metal foreign matter exists between the transmitting coil L1 and the receiving coil L2 but horizontal position offset exists, the power loss is increased due to stray loss caused by the horizontal position offset, and therefore the metal foreign matter exists between the transmitting coil and the receiving coil, which may be determined by mistake, and the accuracy of detecting the metal foreign matter is influenced.

Accurate compensation of stray losses due to horizontal position offset between the transmit coil L1 and the receive coil L2 becomes critical to improving the accuracy of the power loss (Ploss) calculation.

Referring to fig. 6, a graph of stray loss versus horizontal offset length provided by an embodiment of the present application is shown.

Referring to the curve diagram, corresponding to a row of data of stray loss of table one, the key of stray loss compensation is realized by compensating stray loss caused by horizontal offset (loss caused by metal foreign matters cannot be compensated) according to horizontal offset length information through curve fitting, and then the accuracy of judging the metal foreign matters based on power loss under the wireless charging condition is improved. The principle and implementation of curve fitting are described in detail below.

According to the embodiment of the application, the auxiliary coil is additionally arranged on the electronic equipment, and then the power loss caused by horizontal position deviation is acquired by utilizing the coil coupling relation between any two coils of the electronic equipment and the transmitting coil.

Wherein, the coil coupling relation comprises any one of the following: a coil mutual inductance, a coil coupling coefficient, or a magnitude of a voltage at which a coil in an electronic device couples from a transmitting coil, the coil mutual inductance being proportional to an output voltage of the coil in the electronic device; the coil coupling coefficient is proportional to an output voltage of a coil in the electronic device.

In some embodiments, the error power may be obtained by specifically using a ratio of respective coil coupling relationships between any two coils of at least two coils of the electronic device and the transmitting coil, where the error power is a power loss caused by a horizontal position offset between the electronic device and the wireless charger, and the error power and the ratio have a positive correlation.

First, the principle of obtaining error power by using the receiver coil and the auxiliary coil in the present application is described by taking the coil coupling relationship as the mutual inductance of the coil.

Referring to fig. 7, a schematic diagram of a first embodiment of the present disclosure is shown.

Corresponding to the wireless charging system shown in fig. 4, the wireless charging system includes at least three coils: a transmitting coil L1, a receiving coil L2 and at least one auxiliary coil L3. First, the number of auxiliary coils is 1.

The mutual inductance of the receiver coil L2 to the transmitter coil L1 is M12, and the mutual inductance of the auxiliary coil L3 to the transmitter coil L1 is M13.

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.

Since the induced voltage U2 ℃. alpha.M 12 × I1 of the receiver coil L2 and the induced voltage U3 ℃. alpha.M 13 × I1 of the auxiliary coil L3 are in other words, the induced voltages are proportional to the mutual inductance, and the magnitude of the mutual inductance determines the magnitude of the induced voltage of the coil, the ratio of the mutual inductance can also be represented by the ratio of the voltages.

When there is a horizontal position offset between the transmitting coil L1 and the receiving coil L2 (the horizontal position offset is characterized by the amount of center offset in fig. 7), the relative positions of the receiving coil L2 and the auxiliary coil L3 are fixed, and there is a corresponding horizontal position offset between the transmitting coil L1 and the auxiliary coil L3.

When the receiving coil L2 and the auxiliary coil L3 of the electronic apparatus are disposed in the same plane, the vertical distance in fig. 7 refers to the distance between the plane of the transmitting coil L1 and the plane of the receiving coil L2, and hereinafter, this vertical distance is referred to as a Z-direction distance.

For a wireless charging system including an electronic device and a wireless charger, the Z-direction distance may vary, for example, when the electronic device is covered with a different type of protective case, the Z-direction distance between the plane of the transmitting coil L1 and the plane of the receiving coil L2 may vary.

Referring to fig. 8, a graph of the mutual inductance ratio provided by an embodiment of the present application is illustrated.

The figure shows the ratio of the mutual inductances M13 to M12 versus the horizontal position offset length for the same electronic device when the Z-direction distances (4 mm, 5mm and 6mm, respectively) are different. It can be seen 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 the mutual inductances M13 and M12 increases accordingly, and the two have a positive correlation.

When the horizontal position offset length is fixed, the ratio of the mutual inductance M13 to M12 is increased correspondingly as the Z-direction distance is increased. The above situation may correspond to a scene in which a protective case (protective case) is installed on the electronic device in practical application, that is, the thicker the protective case is, the corresponding increase of the Z-direction distance results in a corresponding increase of the ratio of the mutual inductance M13 to M12.

Referring to fig. 9, a graph of mutual inductance ratio versus error power provided by an embodiment of the present application is illustrated.

Fig. 9 shows the relationship between the ratio of M13 to M12 and the stray loss, taking as an example that the Z-direction length (i.e., the distance between the transmitting coil L1 and the plane of the receiving coil L2) is 6mm and the center offset (i.e., the horizontal position offset length) is 0-10 mm.

Fitting the curve shown in fig. 9 to obtain a fitting equation: -1.0884x²+9.8417 x-17.615. Wherein x is the ratio of M13 to M12, and y is the stray loss.

The relationship shown in this equation yields the error power to compensate for the stray loss shown in table one, and the resulting compensated stray loss is shown in the table below.

Table two: error table of compensated stray losses

As can be seen from the compensated error data shown in table three, the power loss caused by the horizontal position offset between the receiving coil and the transmitting coil of the wireless charger after compensation is significantly reduced.

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 shown in the following table. The output power of the electronic equipment in the BPP protocol to the charging circuit is 5W, and the output power of the electronic equipment in the EPP protocol to the charging circuit can reach 15W.

Table three: correspondence of power loss (Ploss) threshold to output power

When the power loss reaches the Ploss threshold, the wireless charger interrupts power transfer. As can be seen from the data in table two, after the stray loss is compensated by the fitting equation, the stray loss introduced into the wireless charging system due to the horizontal position offset becomes very small, not exceeding 150mW, smaller than the power loss threshold 350mW at which the wireless charger will interrupt power transmission under the BPP protocol, and smaller than the power loss threshold 350mW-750mW at which the wireless charger will interrupt power transmission under the EPP protocol. Therefore, when the wireless charger does not have the metal foreign matter, the power transmission is not interrupted due to the fact that the horizontal position offset exists between the receiving coil of the electronic equipment and the transmitting coil of the wireless charger, namely when the metal foreign matter is detected through detecting power loss (Ploss), loss caused by the horizontal position offset between the transmitting coil and the receiving coil in the power loss is compensated, and the metal foreign matter can be detected more accurately.

It can be understood that the fitting equation obtained above is described as a quadratic equation, in some embodiments, the fitting equation may also be a linear equation or an equation in other forms, depending on the fitting algorithm, and the details of the embodiments of the present application are not repeated herein.

In some embodiments, the ratio of the output voltages of the receiving coil and the transmitting coil may also be used to obtain the corresponding error power, that is, the ratio of M12 to M13 is obtained.

The controller in the embodiment of the present application may be a main processor on the electronic device, or may be another processor on the electronic device. For example, when the electronic device is a mobile phone, the controller may be a main processor, i.e., a CPU, of the mobile phone, and may also be another processor, e.g., another chip with an arithmetic control function.

In the above embodiment, for the electronic device, the corresponding relationship between the mutual inductance ratio of the coil at different Z-direction distances and the horizontal position offset length may be measured in advance and stored in the electronic device, for example, may be stored in a memory of the electronic device.

Further, the fitting equation of the mutual inductance ratio of the coil at each Z-direction distance value 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 may obtain a Z-direction distance between the electronic device and the wireless charger, obtain a mutual inductance ratio corresponding to the coil by using an output voltage of the coil, and call a corresponding relationship between the mutual inductance ratio of the coil corresponding to the current Z-direction distance and the horizontal position offset length, and a fitting equation corresponding to the current Z-direction distance.

The controller of the electronic equipment further acquires the horizontal position offset length corresponding to the current mutual inductance ratio according to the corresponding relation between the mutual inductance ratio of the coil and the horizontal position offset length, and acquires the stray loss corresponding to the current mutual inductance ratio according to a fitting equation, namely the power loss caused by the horizontal position offset between the receiving coil of the electronic equipment and the transmitting coil of the wireless charger is acquired.

With continued reference to the wireless charging system of fig. 4, based on the above-described principle, the following describes the operating principle of the electronic device provided in the embodiment of the present application.

The receiver controller 304 obtains an error power, which is denoted by Δ P, using the output voltage V1 of the receiver coil L2 and the output voltage V2 of the first auxiliary coil L3.

Specifically, the controller may obtain a ratio corresponding to the mutual inductance of the receiving coil L2 and the first auxiliary coil L3 using a ratio of the output voltage V1 of the receiving coil L2 and the output voltage V2 of the first auxiliary coil L3.

The receiver controller 304 obtains the compensated output power Prx from the output power Pout and the error power Δ P. Wherein, Prx ═ Pout +. DELTA.P.

The receiving end controller 304 sends the compensated output power Prx to the transceiver of the receiving end, and then the transceiver of the receiving end sends the compensated output power Prx 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.

It should be noted that, the wireless charger is connected to a power supply, for example, to the mains, and the input power Pin of the wireless charger can be obtained from the input voltage and the input current of the wireless charger. The output power Pout in the electronic device refers to power output to the charging circuit, and Pout may be obtained by using the output voltage and the input current of the rectifier corresponding to the receiving coil, as shown in fig. 4, and may be obtained by the output voltage and the output current of the first rectifier 303 a.

Of course, in some embodiments, the error power may also be obtained by using the ratio of the coupling coefficients of the coils at the receiving end. Because the coil coupling coefficient is directly proportional to the output voltage of the coil in the electronic device, the ratio of the output voltages of any two coils of the receiving end can still be used for representing the coil coupling relationship between the any two coils and the transmitting coil, and then the error power is obtained, and the embodiment of the application is not repeated herein.

In some embodiments, the effect of the auxiliary coil may be determined by: when other conditions of the electronic equipment are fixed and unchanged, the feedback power of the electronic equipment to the wireless charger is directly measured when the electronic equipment comprises the auxiliary coil, and the feedback power of the electronic equipment to the wireless charger is measured again when the electronic equipment does not comprise the auxiliary coil, and the difference of the two feedback powers obtained by two times of measurement is compared, so that the effect of the auxiliary coil can be determined as the compensation error power.

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 transmitting coil; when two auxiliary coils are included, the error power, which characterizes the power loss caused by the horizontal position offset between the transmitting coil and the receiving coil, can be obtained by using the coil coupling relationship of the two auxiliary coils with the transmitting coil, respectively, and the error power is positively correlated with the ratio. The controller obtains 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 power loss according to the input power and the compensated output power, and the power loss caused by horizontal position offset between the transmitting coil and the receiving coil in the power loss is compensated.

In summary, with the electronic device provided in the embodiment of the present application, power loss caused by horizontal position offset between the receiving coil of the electronic device and the transmitting coil of the wireless charger can be compensated, and the auxiliary coil mainly detects the excitation magnetic flux, that is, the magnetic flux provided by the transmitting coil is insensitive to magnetic flux change caused by a metallic foreign object, so that power loss caused by a metallic foreign object cannot be compensated, so that when detecting a metallic foreign object, it is not determined that the loss is caused by a metallic foreign object due to horizontal position offset between the transmitting coil and the receiving coil, and it is avoided that a metallic foreign object is erroneously determined to exist between the transmitting coil and the receiving coil when there is no metallic foreign object but there is horizontal position offset between the transmitting coil and the receiving coil, and therefore, accuracy of detecting the metallic foreign object is also improved.

Example two:

the operation principle of the electronic device including the receiving coil and the first auxiliary coil will be described below with reference to a specific implementation.

Referring to fig. 10, the figure is a schematic view of a wireless charging system corresponding to another electronic device provided in the embodiment of the present application.

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.

In one possible implementation, the controller can obtain the error power using a 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 alternating voltage, and the controller may obtain the corresponding error power according to a ratio of peak values of the output voltages of the two coils or a ratio of effective values of the output voltages of the two coils, which is not specifically limited in this embodiment of the application.

In another possible implementation, the ratio of the dc output voltages corresponding to the two coils may be utilized, for example, the controller is configured to obtain the error power according to the ratio of the first output voltage V1 of the first rectifier 303a and the second output voltage V2 of the second rectifier 303 b.

Further, for the above second implementation, when the error power is obtained by using the ratio of the output voltages of the rectifiers of the receiving coil L2 and the first auxiliary coil L1, since the current output from the receiving coil needs to charge the battery, the load current flowing through the receiving coil L2, the capacitor C2 and the first rectifier 303a of the electronic device will generate a voltage drop, which in turn affects the accuracy of the obtained first output voltage V1 of the first rectifier 303a, so in order to compensate for the load current versus voltage error, the equivalent resistance of the receiving coil L2, the capacitor C2, the first rectifier 303a, etc. of the electronic device may be denoted by Requ, the output current of the electronic device is Iout, the receiving-end controller 304 may also compensate the first output voltage V1 of the first rectifier 303a through Requ and Iout, and obtain a compensated output voltage V1' through the following formula:

V1’＝V1+Requ×Iout(1)

requ in the formula (1) is a preset impedance, can be predetermined and stored in the electronic equipment, and Iout can be detected in real time.

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, then obtains the ratio of the compensated voltage V1' to the second voltage V2, obtains the corresponding error power Δ P according to the ratio, and obtains the compensated output power Prx according to the output power Pout and the error power Δ P. Wherein, Prx ═ Pout +. DELTA.P. The receiving-end controller 304 then transmits the compensated output power Prx to the wireless charger.

Because the first output voltage V1 of the first rectifier 303a is compensated at the electronic device terminal, the influence of the impedance of the electronic device on the error power Δ P can be reduced, so that the compensated output power Prx obtained by the receiving terminal controller 304 is more accurate, and the power loss obtained by the transmitting terminal controller is more accurate, thereby further improving the precision of metal foreign object detection.

Referring to fig. 11, the figure is a schematic diagram of a coil of an electronic device according to an embodiment of the present application.

Corresponding to the electronic device shown in fig. 10, the receiving coil L2 may be disposed at the radially inner periphery of the first auxiliary coil L3. In this case, the first end (c) and the second end (c) of the receiving coil L2 are located between the first end (c) and the second end (c) of the first auxiliary coil L3.

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

Further, in some embodiments, the receiving coil L2 and the first auxiliary coil L3 are located on the same plane, so that the thickness of the coil module of the electronic device is not increased, and the electronic device is light and thin.

In some embodiments, the center of the receive coil L2 and the center of the first auxiliary coil L3 coincide. That is, when the receiver coil L2 and the first auxiliary coil L3 are circular ring windings, the centers of the circles of the receiver coil L2 and the first auxiliary coil L3 coincide with each other when they are disposed. When other non-circular coils, for example, square coils, are present in the receiver coil L2 and the first auxiliary coil L3, the geometric center points of the receiver coil L2 and the first auxiliary coil L3 are disposed to coincide.

Referring to fig. 12A, a schematic diagram of a coil of another electronic device provided in the embodiment of the present application is shown.

In other embodiments of the present application, the first auxiliary coil L3 is disposed at a radially inner periphery of the receiving coil L2. The first end (c) and the second end (c) of the receiving coil L2 are located between the first end (r) and the second end (r) of the first auxiliary coil L3.

Referring to fig. 12B, the figure is a schematic view of a coil of another electronic device provided in the embodiment of the present application.

In still other embodiments of the present application, a portion of the first auxiliary coil L3 is disposed at the radially inner periphery of the receiver coil L2, and another portion is disposed at the radially outer periphery of the receiver coil L2. The first end (c) and the second end (c) of the receiving coil L2 are located between the first end (r) and the second end (r) of the first auxiliary coil L3.

Further, in some embodiments, the controller is further capable of obtaining a horizontal position offset between the transmitting coil L1 and the receiving coil L2 according to the obtained ratio, i.e., obtaining a horizontal position offset length. Specifically, the receiver controller 304 may determine the error power at this time by using a fitting equation, and obtain the horizontal offset from a predetermined corresponding relationship between the error power and the horizontal offset (a corresponding relationship between horizontal offset lengths). In some embodiments, the predetermined correspondence relationship between the error power and the horizontal offset may be stored in the electronic device in the form of a data table, and then the horizontal offset corresponding to the current error power may be determined by means of a table lookup.

Referring to fig. 13, the figure is a schematic diagram of a horizontal position offset prompting device provided in the embodiment of the present application.

The electronic device 01 may further include a display screen, and for a description of the display screen, reference may be made to the description of the display screen 10 in fig. 2, which is not described herein again in this embodiment of the present application. The controller can also send the horizontal position offset to the display screen for display so as to prompt that the relative positions of the electronic equipment and the wireless charger need to be corrected at the moment. In addition, in some embodiments, when the controller controls the display screen to display the horizontal position deviation, the electronic device may be further controlled to prompt in a vibration mode, a voice mode, a ring mode, or the like.

The wireless charger 02 may further include a signal lamp having a prompt function, where the signal lamp is used for prompting when a horizontal position deviation occurs, and for example, the signal lamp may flash or be switched to a preset color to prompt when a horizontal position deviation occurs. The signal lamp may also be used to prompt when the controller of the wireless charger (i.e., the transmitting end controller) determines that a metallic foreign object is present between the transmitting coil and the receiving coil.

In summary, the controller of the electronic device provided in the embodiment of the present application can obtain the error power according to the ratio of the output voltages of the receiving coil and the first auxiliary coil, or 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, where 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 to the ratio. The controller obtains 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 power loss according to the input power and the compensated output power.

In addition, when the controller 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, the first voltage can be compensated by utilizing the preset impedance and the output current of the first rectifier, and then the influence of the impedance of the electronic equipment on the error power can be reduced, so that the compensated output power obtained by the receiving end controller is more accurate, and further the power loss obtained by the transmitting end controller can be more accurate, and therefore the precision of metal foreign matter detection is further improved.

Example three:

in the above description, the electronic device includes a receiving coil, an auxiliary coil is described as an example, and the ratio is a ratio of voltages corresponding to the receiving coil and the auxiliary coil.

Referring to fig. 14, this figure is a schematic view of a wireless charging system corresponding to another electronic device according to an embodiment of the present application.

The electronic device includes a receiving coil L2, a first auxiliary coil L3, and a second auxiliary coil L4. The controller further 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.

In one possible implementation, the receiving-end controller 304 is configured to obtain the error power by using a ratio of the output voltage of the first auxiliary winding L3 and the output voltage of the second auxiliary winding L4. The output voltage of the coil is an alternating voltage, and the controller may obtain the corresponding error power according to a ratio of peak values of the output voltages of the two coils or a ratio of effective values of the output voltages of the two coils, which is not specifically limited in this embodiment of the application.

In another possible implementation, the controller is configured to obtain an error power Δ P according to a ratio of the output voltage V2 of the second rectifier 303b and the output voltage V3 of the third rectifier 303c, and obtain a compensated output power Prx from the output power Pout and the error power Δ P. Wherein, Prx ═ Pout +. DELTA.P.

The receiving end controller 304 then 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. Wherein Ploss ═ Pin-Prx.

Referring to fig. 15, the figure is a schematic view of a coil of another electronic device provided in an embodiment of the present application.

In some embodiments, the first and second auxiliary coils L3 and L4 are located radially inward and outward of the receive coil L2, respectively. In this case, the first end (r) and the second end (r) of the second auxiliary coil L4 are at the outermost periphery, the first end (r) of the receiving coil L2 is between the first end (r) of the second auxiliary coil L4 and the first end (r) of the first auxiliary coil L3, and the second end (r) of the receiving coil L2 is between the second end (r) of the second auxiliary coil L4 and the second end (r) of the first auxiliary coil L3.

Furthermore, in other embodiments, the first auxiliary coil L3 and the second auxiliary coil L4 may also both be located radially inward of the receive coil L2; the first auxiliary coil L3 and the second auxiliary coil L4 may also both be located at the radial periphery of the receiving coil L2. The embodiments of the present application are not described in detail again.

In some embodiments, the receiving coil L2, the first auxiliary coil L3, and the second auxiliary coil L4 are located on the same plane, so that the thickness of the coil module of the electronic device is not increased, and the electronic device is light and thin.

In some embodiments, the center of the receive coil L2, the center of the first auxiliary coil L3, and the center of the second auxiliary coil L4 coincide. That is, when the receiver coil L2, the first auxiliary coil L3, and the second auxiliary coil L4 are circular ring-shaped windings, the centers of the circles of the receiver coil L2, the first auxiliary coil L3, and the second auxiliary coil L4 are overlapped when they are disposed. When there are other non-circular coils, for example, square coils, among the receiver coil L2, the first auxiliary coil L3, and the second auxiliary coil L4, the geometric center points of the receiver coil L2, the first auxiliary coil L3, and the second auxiliary coil L4 coincide.

In some embodiments, the first auxiliary coil L3 and the second auxiliary coil L4 may have one or more turns, and when multiple turns, ends of the multiple turn coils are connected together 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, and the embodiment of the present application is not particularly limited. Taking the schematic diagram of the coil shown in fig. 15 as an example, the position of the end of the auxiliary coil is the position of the number (r), (c) in the diagram, and when the ends of the multi-turn coil are connected in series, the end corresponding to the number (c) may be connected in series with the end corresponding to the number (r). When the ends of the multi-turn coil are connected in parallel, one end corresponding to the label (c) can be connected with one end corresponding to the label (c), and one end corresponding to the label (c) can be connected with one end corresponding to the label (r), so that the parallel connection of the inner coil and the outer coil is realized.

Further, in some embodiments, the controller is further capable of determining a horizontal position offset between the transmitting coil L1 and the receiving coil L2, i.e., acquiring a horizontal position offset length, according to the acquired ratio. Specifically, the receiver controller 304 may determine the error power at this time by using a fitting equation, and then determine the horizontal offset by using a predetermined correspondence between the error power and the horizontal offset (a correspondence between horizontal offset lengths). In some embodiments, the predetermined correspondence between the error power and the horizontal offset may be stored in the electronic device in the form of a data table, and then the horizontal offset of the drinking from the current error power may be determined by means of a table lookup.

The electronic device may further include a display screen, and the controller may be further configured to send the horizontal position offset to the display screen for display to prompt that the relative position between 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 deviation, the electronic device may be further controlled to prompt in a vibration mode, a voice mode, a ring mode, or the like.

In summary, the controller of the electronic device provided in the embodiment of the present application can obtain the error power according to the ratio of the output voltages of the first auxiliary coil and the second auxiliary coil, or obtain the error power according to the ratio of the output voltage of the second rectifier and the output voltage of the third rectifier, where 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 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 power loss according to the input power and the compensated output power, and the power loss caused by horizontal position offset between the transmitting coil and the receiving coil in the power loss is compensated, so that the accuracy of metal foreign object detection by applying the power loss is higher.

Furthermore, when the controller obtains the error power according to the ratio of the output voltage of the second rectifier and the output voltage of the third rectifier, since the first auxiliary winding and the second auxiliary winding are not used for charging the battery 50, i.e., 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 the output voltage of the rectifiers.

The method comprises the following steps:

based on the electronic device provided by the above embodiment, an embodiment of the present application further provides a power compensation method applied to a wireless charging electronic device, which is specifically described below with reference to the accompanying drawings.

Referring to fig. 16, the diagram is a schematic diagram of a power compensation method provided in an embodiment of the present application.

The method is applied to the wireless charging electronic equipment which comprises a controller, at least two coils and a transceiver, wherein the at least two coils comprise a receiving coil, and the rest are auxiliary coils.

The receiving coil is used for coupling the electric energy of the transmitting coil to charge a battery in the electronic equipment.

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

For specific description of the electronic device, reference may be made to the above embodiments, which are not described herein again.

The method is based on the principle that the error power is obtained by utilizing the coil coupling relationship between any two coils of at least two coils of the electronic equipment and the transmitting coil, wherein the coil coupling relationship comprises any one of the following: a coil mutual inductance, a coil coupling coefficient, or a magnitude of a voltage that a coil in the electronic device couples from the transmit coil; the coil mutual inductance is proportional to an output voltage of a coil in the electronic device; the coil coupling coefficient is proportional to an output voltage of a coil in the electronic device.

In some embodiments, the error power may be obtained by using a ratio of any two coils of the at least two coils to the coil coupling relationship of the transmitting coil, and the error power is in a positive correlation with the ratio.

The following description takes the coil coupling relationship as the coil mutual inductance as an example, and the principle is similar when the coil coupling relationship is other two relationships, and the embodiments of the present application are not described herein again.

An electronic device may include a memory, and one or more computer programs, wherein the one or more computer programs are stored in the memory, the one or more computer programs including instructions that, when executed by the electronic device, cause the electronic device to perform the steps of:

s1601: the electronic equipment is placed on the wireless charger to start wireless charging.

S1602: a 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.

This vertical distance is the Z-direction distance described in the above embodiments.

S1603: and the controller of the electronic equipment acquires the corresponding relation between the mutual inductance ratio of the coil corresponding to the vertical distance and the horizontal position offset length, and acquires a fitting equation of the mutual inductance ratio corresponding to the vertical distance.

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

Further, the fitting equation for the mutual inductance ratio of the coils at each vertical distance may also be predetermined and stored on the electronic device, for example, on a memory of the electronic device.

S1604: and a controller of the electronic equipment acquires the mutual inductance ratio corresponding to the coils by using the output voltages of any two coils in the at least two coils.

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

The principle of the method when the electronic device comprises a receiving coil and a first auxiliary coil is first explained below.

With continued reference to fig. 10, at this time S1604, specifically, the error power is obtained by using the ratio of the output voltage of the receiving coil and the output voltage of the first auxiliary coil.

The output voltage of the coil is an alternating voltage, and in some embodiments, the corresponding error power may be obtained according to a ratio of peak values of the output voltages of the two coils or a ratio of effective values of the output voltages of the two coils, which is not specifically limited in this embodiment of the application.

Further, the electronic device further includes a first rectifier connected to the receiving coil, and a second rectifier connected to the first auxiliary coil.

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

In some embodiments, since the current output by the receiving coil needs to charge the battery, and the load current flowing through the receiving coil L2, the capacitor C2, the first rectifier, and the like of the electronic device may generate a voltage drop, thereby affecting the accuracy of the obtained first output voltage of the first rectifier, in order to compensate the error of the load current to the voltage, the receiving coil L2, the capacitor C2, the equivalent resistor of the first rectifier, and the like of the electronic device are represented by Requ, and the output current of the electronic device is Iout, and then the first output voltage V1 of the first rectifier may be compensated by Requ and Iout, so as to obtain a compensated output voltage V1'.

Among them, V1 ═ V1+ Requ × Iout.

The ratio of the compensated voltage V1' to the second voltage V2 is then obtained.

The principle of the method when the electronic device comprises a receiving coil, a first auxiliary coil and a second receiving coil is explained below.

With continued reference to fig. 14, at this time S1604, specifically, the error power is obtained by using the ratio of the output voltage of the first auxiliary winding and the output voltage of the second auxiliary winding.

The output voltage of the coil is an alternating voltage, and in some embodiments, the corresponding error power may be obtained according to a ratio of peak values of the output voltages of the two coils or a ratio of effective values of the output voltages of the two coils, which is not specifically limited in this embodiment of the present application.

Further, the electronic device further comprises a first rectifier connected with the receiving coil, a second rectifier connected with the first auxiliary coil and a third rectifier connected with the second auxiliary coil.

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

S1605: the controller of the electronic device determines to obtain the error power according to the fitting equation of the mutual inductance ratio obtained in step S1603 by using the mutual inductance ratio.

S1606: the controller of the electronic device determines the horizontal position offset length between the current electronic device and the wireless charger according to the mutual inductance ratio obtained in S1603 and the corresponding relationship between the horizontal position offset length and the mutual inductance ratio.

S1607: and the controller of the electronic equipment sends the horizontal position deviation to the display screen for displaying.

With continued reference to 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 to indicate that the relative positions of the electronic device and the wireless charger need to be corrected at this time. In addition, in some embodiments, when the controller controls the display screen to display the horizontal position deviation, the electronic device may be further controlled to prompt in a vibration mode, a voice mode, a ring mode, or the like.

The signal lamp on the wireless charger 02 is used to prompt when a horizontal position deviation occurs. The signal lamp may also be used to prompt when the controller of the wireless charger (i.e., the transmitting end controller) determines that a metallic foreign object is present between the transmitting coil and the receiving coil.

S1608: and the controller of the electronic equipment obtains compensated output power from the output power and the error power and sends the compensated output power to the transceiver.

When the error power is represented by Δ P and the output power is represented by Pout, the compensated output power Prx is Pout + Δ P.

S1609: and the transceiver of the electronic equipment transmits the compensated output power Prx to the wireless charger, so that the wireless charger obtains power loss according to the input power and the compensated output power.

The input power is denoted by Pin, and the power loss Ploss is Pin-Prx.

It is to be understood that the division and sequence of the above steps are merely for convenience of description, and do not limit the method described in the present application, and the above steps may be appropriately adjusted and exchanged in some embodiments.

To sum up, the method provided by the embodiment of the present application obtains the error power by using the respective coil coupling relationships between any two coils of the electronic device and the transmitting coil, that is, when only one auxiliary coil is included, the error power can be obtained by using the respective coil coupling relationships between the receiving coil and the transmitting coil; when two auxiliary coils are included, the error power, which characterizes the power loss caused by the horizontal position offset between the transmitting coil and the receiving coil, can be obtained by using the coil coupling relationship between the two auxiliary coils and the transmitting coil, respectively, and the error power is positively correlated with the ratio. And obtaining compensated output power by the output power and the error power, sending the compensated output power to a transceiver, and sending the compensated output power to the wireless charger by the transceiver so that the wireless charger obtains power loss according to the input power and the compensated output power. The power loss caused by the horizontal position offset between the transmitting coil and the receiving coil is already compensated for in this case. Therefore, when the metal foreign matter is detected, the loss caused by the metal foreign matter due to the horizontal position offset between the transmitting coil and the receiving coil cannot be considered, the metal foreign matter is prevented from being mistakenly judged to exist between the transmitting coil and the receiving coil when no metal foreign matter exists between the transmitting coil and the receiving coil but the horizontal position offset exists, and therefore the accuracy of metal foreign matter detection is improved.

The embodiment of the system is as follows:

based on the electronic device provided by the above embodiment, an embodiment of the present application further provides a wireless charging system, which is specifically described below with reference to the accompanying drawings.

Referring to fig. 17, the figure is a schematic view of a wireless charging system according to an embodiment of the present application.

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

The wireless charger 02 includes a power supply, a transmitting terminal controller, an inverter, a transmitting terminal transceiver, a matching capacitor, and a transmitting coil.

The electronic device 01 comprises 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.

The power supply may be implemented by the adapter of fig. 1. The inverter is used for converting direct current output by the power supply into alternating current and outputting the alternating current, so that the transmitting coil generates high-frequency alternating current and transmits an alternating magnetic field. The receiving coil outputs alternating current after receiving the alternating magnetic field, the rectifier converts the alternating current into direct current and then inputs the direct current into the charging circuit, and the charging circuit charges a battery.

The electronic device further comprises a memory, and one or more computer programs, wherein the one or more computer programs are stored in the memory, the one or more computer programs comprising instructions which, when executed by the electronic device, cause the electronic device to perform the steps recited in the above method embodiments.

The controller of the receiving end obtains the error power by utilizing the coil coupling relationship between any two coils of the at least two coils of the receiving end and the transmitting coil respectively, wherein the coil coupling relationship comprises any one of the following: a coil mutual inductance, a coil coupling coefficient, or a magnitude of a voltage that a coil in the electronic device couples from the transmit coil; the coil mutual inductance is proportional to an output voltage of a coil in the electronic device; the coil coupling coefficient is proportional to an output voltage of a coil in the electronic device.

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

And obtaining the compensated output power from the output power and the error power, and sending the compensated output power to a transceiver at a receiving end. The transceiver of the receiving end transmits the compensated output power to the transceiver of the wireless charger, so that the controller of the wireless charger 02 obtains power loss Ploss according to the input power Pin and the compensated output power Prx, and when the power loss is greater than a preset power threshold, it is determined that a metal foreign object exists between the transmitting coil L1 and the receiving coil L2. Wherein Ploss ═ Pin-Prx.

In some embodiments, the value of the preset power threshold is related to the magnitude of the output power, for example, see table three in the above description, and different output powers correspond to different Ploss thresholds (i.e., preset power thresholds).

For the operation principle of the controller of the electronic device, reference may be made to the relevant description in the above embodiments, and the embodiments of the present application are not described herein again.

The electronic device 01 may specifically be a mobile phone (mobile phone), a tablet computer (pad), a computer with a wireless transceiving function, an intelligent wearable product (e.g., a smart watch, a smart bracelet, an earphone, etc.), a Virtual Reality (VR) terminal device, an Augmented Reality (AR) terminal device, etc. and have a wireless device. The electronic equipment can also be electronic products such as a wireless charging electric automobile, a wireless charging household appliance (such as a soybean milk machine and a sweeping robot), an unmanned aerial vehicle and the like.

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 may be a flat mobile phone wireless charger or a vertical mobile phone wireless charger. The wireless charging system at this time can be seen in fig. 1.

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 metallic foreign object, 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, different mutual inductances exist between the receiving coil and the auxiliary coil of the electronic equipment and the transmitting coil, the corresponding relation between the ratio of the mutual inductances corresponding to the coils of the electronic equipment 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, the error power caused by the horizontal position offset can then be determined from the ratio of the corresponding mutual inductances of the coils of the electronic device, and the induced voltage of the coil of the electronic equipment is in direct proportion to the corresponding mutual inductance, so that the ratio of the corresponding mutual inductance between the coils of the electronic equipment can be obtained through the output voltage of the coil of the electronic equipment.

To sum up, 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 transmitting coil; when two auxiliary coils are included, the error power, which characterizes the power loss caused by the horizontal position offset between the transmitting coil and the receiving coil, can be obtained by using the coil coupling relationship of the two auxiliary coils with the transmitting coil, respectively, and the error power is positively correlated with the ratio. The controller obtains 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 power loss according to the input power and the compensated output power. The power loss caused by the horizontal position offset between the transmitting coil and the receiving coil is already compensated for in this case.

Therefore, when the metal foreign matter is detected, the loss caused by the metal foreign matter due to the horizontal position offset between the transmitting coil and the receiving coil cannot be determined, the metal foreign matter is prevented from being mistakenly judged to exist between the transmitting coil and the receiving coil when no metal foreign matter exists between the transmitting coil and the receiving coil but the horizontal position offset exists, and therefore the accuracy of metal foreign matter detection is improved. In addition, when receiving coil and auxiliary coil set up in the coplanar, can not increase the thickness of coil module, the electronic equipment of still being convenient for realizes frivolousization, and the practicality is high.

The transmitter controller and the receiver controller according to the embodiment of the present application may be an application-specific integrated circuit (ASIC), a Programmable Logic Device (PLD), or a combination thereof. The PLD may be a Complex Programmable Logic Device (CPLD), a field-programmable gate array (FPGA), a General Array Logic (GAL), or any combination thereof, and the embodiments of the present application are not limited in particular.

It should be understood that in the present application, "at least one" means one or more, "a plurality" means two or more. "and/or" for describing an association relationship of associated objects, indicating that there may be three relationships, e.g., "a and/or B" may indicate: only A, only B and both A and B are present, wherein A and B may be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of single item(s) or plural items. For example, at least one (one) of a, b, or c, may represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", wherein a, b, c may be single or plural.

The foregoing is merely a preferred embodiment of the present application and is not intended to limit the present application in any way. Although the present application has been described with reference to the preferred embodiments, it is not intended to limit the present application. Those skilled in the art can now make numerous possible variations and modifications to the disclosed embodiments, or modify equivalent embodiments, using the methods and techniques disclosed above, without departing from the scope of the claimed embodiments. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present application still fall within the protection scope of the technical solution of the present application without departing from the content of the technical solution of the present application.

Claims

1. An electronic device, comprising: a controller, a transceiver, and at least two coils;

the auxiliary coil is used for compensating error power caused by horizontal position offset between the electronic equipment and the wireless charger;

the controller is configured to obtain the error power by using a coil coupling relationship between any two coils of the at least two coils and the transmitting coil, obtain a compensated output power from 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 for sending the compensated output power 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.

2. The electronic device of claim 1, wherein the coil coupling relationship comprises any one of: a coil mutual inductance, a coil coupling coefficient, or a magnitude of a voltage that a coil in the electronic device couples from the transmit coil; the coil mutual inductance is proportional to an output voltage of a coil in the electronic device; the coil coupling coefficient is proportional to an output voltage of a coil in the electronic device.

3. The electronic device according to claim 2, wherein the controller is configured to obtain the error power by using a coil coupling relationship between any two coils of the at least two coils and the transmitting coil, and specifically includes:

the controller is configured to obtain an 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, and the error power and the ratio have a positive correlation contrast relationship.

4. The electronic device of claim 3, wherein the at least two coils comprise: a receiving coil and a first auxiliary coil;

the controller is configured to obtain an error power by using a ratio of respective coil coupling relationships between any two coils of the at least two coils and the transmitting coil, and specifically includes:

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.

5. The electronic device of claim 3, wherein the at least two coils comprise: receiving coil and first auxiliary coil, the electronic equipment still includes: a first rectifier connected to the receiving coil, and a second rectifier connected to the first auxiliary coil;

the controller is used for obtaining error power according to the ratio of the first output voltage of the first rectifier and the second output voltage of the second rectifier.

6. The electronic device of claim 5, wherein the controller is further configured 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 voltage.

7. The electronic device of claim 3, wherein the at least two coils comprise: a receiving coil, a first auxiliary coil and a second auxiliary coil;

the controller is used for obtaining error power by using the ratio of the output voltage of the first auxiliary coil and the output voltage of the second auxiliary coil.

8. The electronic device of claim 3, wherein the at least two coils comprise: receiving coil, first auxiliary coil and second auxiliary coil, the electronic equipment still 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 for obtaining error power according to the ratio of the output voltage of the second rectifier and the output voltage of the third rectifier.

9. The electronic device of any of claims 2-8, wherein the receive coil and the auxiliary coil are located in the same plane.

10. The electronic device of any of claims 2-8, wherein a center of the receive coil and a center of the auxiliary coil coincide.

11. The electronic device of claim 1, wherein the position of the receiving coil and the auxiliary coil is any one of:

the auxiliary coil is located at a radial inner periphery of the receiving coil, the auxiliary coil is located at a radial outer periphery of the receiving coil, and different parts of the auxiliary coil are respectively located at the radial inner periphery and the radial outer periphery of the receiving coil.

12. The electronic device of claim 1, wherein the auxiliary coil comprises at least two of: a first auxiliary coil and a second auxiliary coil;

the position of the receiving coil and the auxiliary coil is any one of the following positions:

the first auxiliary coil and the second auxiliary coil are both located on the radial inner periphery of the receiving coil, the first auxiliary coil and the second auxiliary coil are both located on the radial periphery of the receiving coil, and the first auxiliary coil and the second auxiliary coil are respectively located on the radial inner periphery and the radial periphery of the receiving coil.

13. The electronic device of any of claims 2-8, wherein the auxiliary coil has one or more turns;

when the auxiliary coil is multi-turn, the ends of the multi-turn are connected in parallel or in series.

14. The electronic device of any of claims 2-8, wherein the controller is further configured to obtain a horizontal position offset between the transmitter coil and the receiver coil according to the ratio, and wherein the ratio is positively correlated with the horizontal position offset.

15. The electronic device of claim 13, further comprising: a display screen;

the controller is further configured to send the horizontal position offset to the display screen for displaying.

16. The electronic device according to any one of claims 3-8, wherein the controller is further configured to obtain a vertical distance between the electronic device and the wireless charger, and obtain the corresponding comparison relationship according to the vertical distance.

17. A power compensation method is applied to an electronic device for wireless charging, and the electronic device comprises: a memory, a controller, and at least two coils; the at least two coils comprise 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, the one or more computer programs comprising instructions which, when executed by the electronic device, cause the electronic device to perform the steps of:

18. The method of claim 17, wherein the coil coupling relationship comprises any one of: a coil mutual inductance, a coil coupling coefficient, or a magnitude of a voltage that a coil in the electronic device couples from the transmit coil; the coil mutual inductance is proportional to an output voltage of a coil in the electronic device; the coil coupling coefficient is proportional to an output voltage of a coil in the electronic device.

19. The method according to claim 18, wherein the obtaining the error power by using the respective coil coupling relationships between any two of the at least two coils and the transmitting coil comprises:

and obtaining error power by utilizing the ratio of the 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 contrast relationship.

20. The method of claim 19, wherein the at least two coils comprise: when receiving a coil and a first auxiliary coil, obtaining error power by using a ratio of respective coil coupling relations between any two coils of the at least two coils and a transmitting coil, specifically including:

and obtaining error power by using the ratio of the output voltage of the receiving coil and the output voltage of the first auxiliary coil.

21. The method of claim 19, wherein the at least two coils comprise: receiving coil and first auxiliary coil, the electronic equipment still includes: a first rectifier connected to the receiving coil, and a second rectifier connected to the first auxiliary coil;

the obtaining of the error power by using the ratio of the coupling relationship between any two coils of the at least two coils and the coil of the transmitting coil specifically includes:

error power is obtained according to a ratio of a first output voltage of the first rectifier and a second output voltage of the second rectifier.

22. The method of claim 21, further comprising: and obtaining a compensation voltage according to a preset impedance and the current of the receiving coil, and compensating the first output voltage by using the compensation voltage to obtain the ratio of the compensated voltage to the second voltage.

23. The method of claim 19, wherein the at least two coils comprise: a receiving coil, a first auxiliary coil and a second auxiliary coil;

and obtaining error power by using the ratio of the output voltage of the first auxiliary coil and the output voltage of the second auxiliary coil.

24. The method of claim 19, wherein the at least two coils comprise: receiving coil, first auxiliary coil and second auxiliary coil, the electronic equipment still 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;

and obtaining error power according to the ratio of the output voltage of the second rectifier and the output voltage of the third rectifier.

25. The method according to any one of claims 17-24, further comprising: and obtaining the 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.

26. The method of claim 25, wherein the electronic device further comprises: a display screen;

the method further comprises the following steps: and sending the horizontal position offset to the display screen for displaying.

27. The method according to any one of claims 19-26, further comprising: and obtaining the vertical distance between the electronic equipment and the wireless charger, and obtaining the corresponding contrast relation according to the vertical distance.

28. A wireless charging system comprising a wireless charger and the electronic device of any one of claims 1-16;

the wireless charger includes: a transmitting coil;

the transmitting coil is used for transmitting electric energy to the receiving coil to wirelessly charge the electronic equipment.

29. The system of claim 28, wherein the wireless charger comprises: a transmitting end controller;

and the transmitting terminal controller is used for obtaining power loss according to the input power and the compensated output power, and determining that a metal foreign matter exists between the transmitting coil and the receiving coil when the power loss is greater than a preset power threshold.

30. The system of claim 28, wherein the wireless charger further comprises a signal light;

the signal lamp is used for prompting when the transmitting end controller determines that a metal foreign body exists between the transmitting coil and the receiving coil or when a horizontal position offset exists between the transmitting coil and the receiving coil.