WO2021208621A1 - 一种电子设备、方法及无线充电系统 - Google Patents

一种电子设备、方法及无线充电系统 Download PDF

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Publication number
WO2021208621A1
WO2021208621A1 PCT/CN2021/078803 CN2021078803W WO2021208621A1 WO 2021208621 A1 WO2021208621 A1 WO 2021208621A1 CN 2021078803 W CN2021078803 W CN 2021078803W WO 2021208621 A1 WO2021208621 A1 WO 2021208621A1
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Prior art keywords
coil
electronic device
coils
power
auxiliary
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PCT/CN2021/078803
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English (en)
French (fr)
Inventor
裴昌盛
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华为技术有限公司
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Publication of WO2021208621A1 publication Critical patent/WO2021208621A1/zh

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
    • H02J7/04—Regulation of charging current or voltage
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/40—Circuit arrangements or systems for wireless supply or distribution of electric power using two or more transmitting or receiving devices
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/60—Circuit arrangements or systems for wireless supply or distribution of electric power responsive to the presence of foreign objects, e.g. detection of living beings
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/80—Circuit arrangements or systems for wireless supply or distribution of electric power involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries

Definitions

  • This application relates to the field of wireless charging technology, and in particular to an electronic device, a method, and a wireless charging system.
  • Wireless charging technology uses conductive media such as electric field, magnetic field, microwave, or laser to realize the wireless transmission of electric energy. Due to its advantages of no wire restriction, no plug-in, etc., it is currently more and more used in electronic equipment. The more extensive.
  • the wireless charging system applies wireless charging technology, including electronic devices and wireless chargers, which wirelessly charge electronic devices. If there is a metal foreign body between the electronic device and the power transmission coil module of the wireless charger (that is, the receiving coil of the electronic device and the transmitting coil of the wireless charger), it will cause power loss (Ploss). If the power loss exceeds the setting The wireless charger will interrupt the power transmission.
  • wireless charging technology including electronic devices and wireless chargers, which wirelessly charge electronic devices. If there is a metal foreign body between the electronic device and the power transmission coil module of the wireless charger (that is, the receiving coil of the electronic device and the transmitting coil of the wireless charger), it will cause power loss (Ploss). If the power loss exceeds the setting The wireless charger will interrupt the power transmission.
  • the present application provides an electronic device, a method, and a wireless charging system, which can compensate for the power loss caused by the horizontal position offset between the receiving coil of the electronic device and the transmitting coil of the wireless charger.
  • the present application provides an electronic device, including: a controller, a transceiver, and at least two coils.
  • the at least two coils include a receiving coil and one or more auxiliary coils.
  • the receiving coil is used to couple the electric energy of the transmitting coil of the wireless charger to charge the battery in the electronic device; the auxiliary coil is used to compensate the power loss caused by the horizontal position shift between the electronic device and the wireless charger.
  • the controller uses the coupling relationship between any two coils of the at least two coils and the transmitter coil to obtain the error power.
  • the output power and error power of the charging circuit in the electronic device are used to obtain the compensated output power, and the compensated output power Send to the transceiver.
  • the transceiver sends 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.
  • the charging circuit is an internal circuit of an electronic device, which is used to charge the battery.
  • the error power can be obtained by the coupling relationship between the receiving coil and the auxiliary coil and the transmitting coil respectively; when two auxiliary coils are included, the coupling relationship between the two auxiliary coils and the transmitting coil can be used to obtain the error power. Error power.
  • the coupling relationship between the energy-transmitting coil and the energy-receiving coil determines the magnitude of the voltage coupled to the energy-receiving coil.
  • the coil coupling relationship can be expressed by the coil coupling coefficient or the coil mutual inductance.
  • the coil coupling coefficient is proportional to the voltage coupled to the energy-receiving coil
  • the mutual inductance of the coil is proportional to the voltage coupled to the energy-receiving coil. Therefore, to a certain extent, the voltage of the energy-receiving coil coupling can also represent the coil coupling relationship.
  • the ratio of the coil coupling relationship is used to obtain the error power. In some embodiments, the ratio of the voltage of the coil coupling that receives the energy may also be used to obtain the error power.
  • the electronic device it is possible to compensate for the power loss caused by the horizontal position offset between the receiving coil of the electronic device and the transmitting coil of the wireless charger. In addition, it can also prevent the loss caused by the metal foreign object due to the horizontal position offset between the transmitter coil and the receiving coil during the detection of metal foreign objects, avoiding the loss between the transmitter coil and the receiving coil.
  • the metal foreign body has a horizontal position offset, it is wrongly determined that there is a metal foreign body between the transmitting coil and the receiving coil, so the accuracy of the detection of the metal foreign body is also improved.
  • the coil coupling relationship includes any one of the following: coil mutual inductance, coil coupling coefficient, or voltage magnitude of the coil coupling from the transmitting coil in the electronic device.
  • the mutual inductance of the coil is proportional to the output voltage of the coil in the electronic device
  • the coil coupling coefficient is proportional to the output voltage of the coil in the electronic device. Therefore, the ratio of the output voltage of the coil in the electronic device can be used to characterize the ratio of the mutual inductance of the coil of the electronic device and the coil of the transmitting coil or the ratio of the coil coupling coefficient.
  • the controller utilizes the coupling relationship between any two coils of the at least two coils and the transmitting coil to obtain the error power, specifically:
  • the ratio of the coupling relationship between any two coils and the transmitting coil respectively obtains the error power, and the error power has a positive correlation with the ratio.
  • the at least two coils include: a receiving coil and a first auxiliary coil.
  • the controller uses the ratio of the coupling relationship between any two coils of the at least two coils and the transmitter coil to obtain the error power, which specifically includes: the controller uses the ratio of the output voltage of the receiving coil and the output voltage of the first auxiliary coil to obtain the error power Error power.
  • an auxiliary coil is added to the electronic device, and the auxiliary coil and the receiving coil of the electronic device are used to compensate for the power loss caused by the horizontal position offset between the electronic device and the wireless charger.
  • 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 first rectifier connected to the first auxiliary coil.
  • the controller is used to obtain the error power by using the ratio of the coupling relationship between any two coils of the at least two coils and the transmitting coil, specifically: the controller is used to obtain the error power according to the first output voltage of the first rectifier and the second output of the second rectifier The ratio of the voltages obtains the error power.
  • the output voltage of the rectifier is a DC voltage, which is convenient for collection.
  • the controller is further configured to compensate the first output voltage according to the preset impedance and the output current of the first rectifier, and obtain the difference between the compensated voltage and the second voltage. ratio.
  • the influence of the impedance of the electronic device on the error power can be reduced, so that the compensated output power obtained by the receiving end controller is more accurate, and the power loss obtained by the transmitting end controller can be more accurate. Therefore, the accuracy of metal foreign body detection is further improved.
  • the at least two coils include: a receiving coil, a first auxiliary coil, and a second auxiliary coil.
  • the controller uses the ratio of the coupling relationship between any two coils of the at least two coils and the transmitting coil to obtain the error power, specifically: the controller uses the output voltage of the first auxiliary coil and the output voltage of the second auxiliary coil. The ratio obtains the error power.
  • the first auxiliary coil and the second auxiliary coil of this implementation are not used to charge the battery of the electronic device, that is, the output voltage of the second rectifier and the output voltage of the third rectifier are not affected by the voltage drop caused by the load current, so There is no need to compensate the output voltage of the rectifier.
  • At least two coils include: a receiving coil, a first auxiliary coil, and a second auxiliary coil.
  • the electronic device further includes a first rectifier connected to the receiving coil, and a first rectifier connected to the receiving coil.
  • the controller uses the ratio of the coupling relationship between any two coils of the at least two coils and the transmitting coil to obtain the error power, which specifically includes: the controller obtains the error power according to the ratio of the output voltage of the second rectifier to the output voltage of the third rectifier .
  • the output voltage of the rectifier is a DC voltage, which is convenient for collection.
  • the receiving coil and the auxiliary coil are located on the same plane, so the provision of the auxiliary coil does not increase the thickness of the coil module.
  • the center of the receiving coil coincides with the center of the auxiliary coil, thereby facilitating accurate determination of the level of the receiving coil and the transmitting coil Position offset.
  • the positions of the receiving coil and the auxiliary coil are any one of the following: the auxiliary coil is located in the radial direction of the receiving coil The surrounding and auxiliary coils are located on the radial periphery of the receiving coil, and different parts of the auxiliary coil are located on the radial inner periphery and the radial periphery of the receiving coil, respectively.
  • the auxiliary coil includes at least the following two: 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: the first auxiliary coil and the second auxiliary coil are both located in the radial inner circumference of the receiving coil, the first auxiliary coil and the second auxiliary coil are both located in the radial periphery of the receiving coil, The first auxiliary coil and the second auxiliary coil are respectively located at the radial inner circumference and the radial outer circumference of the receiving coil.
  • the auxiliary coil has one or more turns; when the auxiliary coil has multiple turns, the end of the multi-turn coil Connect in parallel or in series.
  • the controller is also used to obtain the horizontal position offset between the transmitting coil and the receiving coil according to the ratio, and the ratio is compared with the horizontal position.
  • the offset is positively correlated.
  • the electronic device further includes: a display screen.
  • the controller is also used to send the horizontal position offset to the display screen for display, to prompt that the relative position of the electronic device and the wireless charger needs to be corrected at this time.
  • the controller controls the display screen to display the horizontal position offset, it can further control the electronic device to give prompts by means of vibration, voice, ringtone, etc.
  • the controller is also used to obtain the vertical distance between the electronic device and the wireless charger, and obtain the corresponding comparison according to the vertical distance. relation.
  • the vertical distance between the electronic device and the wireless charger may vary.
  • the electronic device may be equipped with protective cases with different thicknesses.
  • the corresponding comparison relationship is obtained according to the current vertical distance, and the corresponding error power can be obtained more accurately, so that the compensation of the power loss caused by the horizontal position offset between the transmitting coil and the receiving coil is more accurate.
  • the fitting equations of the mutual inductance ratios of the coils at different values of the vertical distance may also be predetermined and stored on the electronic device.
  • the controller of the electronic device can obtain the vertical distance from the wireless charger, and use the output voltage of the coil to obtain the ratio of the mutual inductance corresponding to the coil, and call
  • the current vertical distance corresponds to the corresponding relationship between the coil's mutual inductance ratio and the horizontal position offset length, and the current vertical distance corresponds to the fitting equation.
  • the controller of the electronic device further obtains the horizontal position offset length corresponding to the current mutual inductance ratio according to the corresponding relationship between the mutual inductance ratio of the coil and the horizontal position offset length, and obtains the stray corresponding to the current mutual inductance ratio according to the fitting equation Loss is the power loss caused by the horizontal position offset between the receiving coil of the electronic device and the transmitting coil of the wireless charger.
  • an embodiment of the present application also provides a power compensation method, which is applied to an electronic device for wireless charging.
  • the electronic device includes: a memory, a controller, and at least two coils; the at least two coils include A receiving coil, and one or more auxiliary coils; and one or more computer programs, wherein the one or more computer programs are stored in the memory, and the one or more computer programs include instructions, when When the instruction is executed by the electronic device, the electronic device is caused to execute the following steps:
  • the compensated output power is sent to the wireless charger, so that the wireless charger obtains power loss according to the input power of the wireless charger and the compensated output power.
  • the power loss caused by the horizontal position offset between the receiving coil of the electronic device and the transmitting coil of the wireless charger can be compensated.
  • it can also prevent the loss caused by the metal foreign object due to the horizontal position offset between the transmitter coil and the receiving coil during the detection of metal foreign objects, avoiding the loss between the transmitter coil and the receiving coil.
  • the metal foreign body has a horizontal position offset, it is wrongly determined that there is a metal foreign body between the transmitting coil and the receiving coil, so the accuracy of the detection of the metal foreign body is also improved.
  • the coil coupling relationship includes any one of the following: coil mutual inductance, coil coupling coefficient, or the voltage of the coil in the electronic device coupled from the transmitting coil;
  • the coil mutual inductance is proportional to the output voltage of the coil in the electronic device;
  • the coil coupling coefficient is proportional to the output voltage of the coil in the electronic device.
  • using the coupling relationship between any two coils of the at least two coils and the transmitting coil to obtain the error power specifically includes: using any two coils of the at least two coils The ratio of the coupling relationship with the coil of the transmitting coil is used to obtain the error power, and the error power has a positive correlation with the ratio.
  • the ratio obtaining the error power specifically includes: obtaining 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 least two coils include a receiving coil and a first auxiliary coil
  • the electronic device further includes: a first rectifier connected to the receiving coil, and The second rectifier connected to the first auxiliary coil.
  • Using the ratio of the coupling relationship between any two coils of the at least two coils and the transmitting coil to obtain the error power includes: according to the first output voltage of the first rectifier and the second output of the second rectifier The ratio of the voltages obtains the error power.
  • the method further includes: obtaining a compensation voltage according to a preset impedance and the current of the receiving coil, and using the compensation voltage to compensate the first output voltage, The ratio of the compensated voltage to the second voltage is obtained.
  • the influence of the impedance of the electronic device on the error power can be reduced, so that the compensated output power obtained by the receiving end controller is more accurate, and the power loss obtained by the transmitting end controller can be more accurate.
  • the at least two coils include: a receiving coil, a first auxiliary coil, and a second auxiliary coil.
  • Using the ratio of the coupling relationship between any two coils of the at least two coils and the transmitting coil to obtain the error power includes: using the ratio of the output voltage of the first auxiliary coil and the output voltage of the second auxiliary coil to obtain the error power Error power.
  • the at least two coils include: a receiving coil, a first auxiliary coil, and a second auxiliary coil
  • the electronic device further includes: A first rectifier, a second rectifier connected to the first auxiliary coil, and a third rectifier connected to the second auxiliary coil.
  • Using the ratio of the coupling relationship between any two coils of the at least two coils and the transmitting coil to obtain the error power includes: obtaining the error power according to the ratio of the output voltage of the second rectifier to the output voltage of the third rectifier .
  • the output voltage of the rectifier is a DC voltage, which is convenient for detection and acquisition.
  • the method further includes: obtaining a horizontal position offset between the transmitting coil and the receiving coil according to a ratio, and the ratio is offset from the horizontal position Positive correlation.
  • the electronic device further includes: a display screen.
  • the method further includes: sending the horizontal position offset to the display screen for display, to prompt that the relative position of the electronic device and the wireless charger needs to be corrected at this time. .
  • the method further includes: obtaining a vertical distance between the electronic device and the wireless charger, and obtaining the corresponding comparison relationship according to the vertical distance.
  • an embodiment of the present application also provides a wireless charging system, including a wireless charger and the above-mentioned electronic device.
  • the wireless charger includes: a transmitting coil.
  • the transmitting coil is used to transmit electric energy to the receiving coil to wirelessly charge the electronic device.
  • the power loss caused by the horizontal position offset between the receiving coil of the electronic device and the transmitting coil of the wireless charger can be compensated.
  • it can also prevent the loss caused by the metal foreign object due to the horizontal position offset between the transmitter coil and the receiving coil during the detection of metal foreign objects, avoiding the loss between the transmitter coil and the receiving coil.
  • the metal foreign body has a horizontal position offset, it is wrongly determined that there is a metal foreign body between the transmitting coil and the receiving coil, so the accuracy of the detection of the metal foreign body is also improved.
  • the wireless charger includes: a transmitter controller.
  • the transmitting end 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, it is determined that there is a metal foreign object between the transmitting coil and the receiving coil.
  • the wireless charger further includes a signal light.
  • the signal light is used for prompting when the transmitter controller determines that there is a metal foreign object between the transmitter coil and the receiver coil, or when there is a horizontal position offset between the transmitter coil and the receiver coil.
  • an embodiment of the present application also provides a terminal device, including: a controller, a transceiver, and at least two coils;
  • the at least two coils include a receiving coil and one or more auxiliary coils
  • the receiving coil is used to couple the electric energy of the transmitting coil of the wireless charger to charge the battery in the electronic device;
  • the auxiliary coil is used to compensate the power loss caused by the horizontal position offset between the electronic device and the wireless charger;
  • the controller is configured to use the coupling relationship between any two coils of the at least two coils and the transmitting coil to obtain the error power, and to compare the output power of the electronic device to the charging circuit and the error power Sent to the transceiver;
  • the transceiver is configured to send the output power and the error power to the wireless charger, so that the wireless charger can charge the charging circuit in the electronic device according to the input power of the wireless charger and The output power and the error power obtain the power loss.
  • the electronic device includes at least two coils, one of which is a receiving coil, and the rest are auxiliary coils.
  • the power loss between the wireless charger and the electronic device is caused by the horizontal position offset. Due to the horizontal position offset, the coupling relationship between the transmitting coil of the wireless charger transmitting energy and the receiving coil of the electronic device will change. Therefore, an auxiliary coil is added to the electronic device, and the two differences in the electronic device are used. The coils are coupled to the transmitter coil to obtain the error power caused by the horizontal position offset.
  • the coupling relationship between the receiving coil and the auxiliary coil and the transmitting coil can be used to obtain the error power; when two auxiliary coils are included, the coupling relationship between the two auxiliary coils and the transmitting coil can be used.
  • Get error power The error power characterizes the power loss caused by the horizontal position offset between the transmitting coil and the receiving coil.
  • the controller obtains the compensated output power according to the output power and the error power, and sends the compensated output power to the transceiver, and then the transceiver to the wireless charger, so that the wireless charger is based on the input power and the output power.
  • the output power after the compensation obtains the power loss. At this time, the power loss caused by the horizontal position offset between the transmitting coil and the receiving coil in the power loss has been compensated.
  • the electronic device provided by the present application can compensate for the power loss caused by the horizontal position offset between the receiving coil of the electronic device and the transmitting coil of the wireless charger. In addition, it can also prevent the loss caused by the metal foreign object due to the horizontal position offset between the transmitter coil and the receiving coil during the detection of metal foreign objects, avoiding the loss between the transmitter coil and the receiving coil.
  • the metal foreign body has a horizontal position offset, it is wrongly determined that there is a metal foreign body between the transmitting coil and the receiving coil, so the accuracy of the detection of the metal foreign body is also improved.
  • FIG. 1 is a schematic diagram of a wireless charging system provided by this application.
  • FIG. 2 is a schematic diagram of the structure of the electronic device in FIG. 1;
  • FIG. 3 is a schematic diagram of another wireless charging system provided by this application.
  • FIG. 4 is a schematic diagram of a wireless charging system corresponding to an electronic device provided by an embodiment of the application.
  • Figure 5 is a schematic diagram of the distribution of the loss of each part corresponding to Table 1 with the change of the horizontal position offset length;
  • FIG. 6 is a schematic diagram of the curve of the stray loss as a function of the horizontal position offset length provided by an embodiment of the application;
  • FIG. 7 is a schematic diagram 1 of the principle provided by an embodiment of the application.
  • FIG. 8 is a schematic diagram of a curve of the mutual inductance ratio provided by an embodiment of the application.
  • FIG. 9 is a schematic diagram of a curve of mutual inductance ratio and error power provided by an embodiment of the application.
  • FIG. 10 is a schematic diagram of a wireless charging system corresponding to another electronic device according to an embodiment of the application.
  • FIG. 11 is a schematic diagram of a coil of an electronic device provided by an embodiment of the application.
  • 12A is a schematic diagram of a coil of another electronic device provided by an embodiment of the application.
  • 12B is a schematic diagram of a coil of yet another electronic device provided by an embodiment of the application.
  • FIG. 13 is a schematic diagram of a prompt provided by an embodiment of the application when a horizontal position shift occurs
  • FIG. 14 is a schematic diagram of another wireless charging system corresponding to an electronic device according to an embodiment of the application.
  • 15 is a schematic diagram of a coil of still another electronic device provided by an embodiment of this application.
  • FIG. 16 is a schematic diagram of a power compensation method provided by an embodiment of this application.
  • FIG. 17 is a schematic diagram of a wireless charging system provided by an embodiment of the application.
  • first and second in the following description are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, the features defined with “first”, “second”, etc. may explicitly or implicitly include one or more of these features. In the description of this application, unless otherwise specified, “plurality” means two or more.
  • azimuthal terms such as “upper” and “lower” may include but are not limited to the directions defined relative to the schematic placement of the components in the drawings. It should be understood that these directional terms may be relative concepts. They are used for relative description and clarification, which can be changed according to the changes in the orientation of the parts in the drawings.
  • connection should be understood in a broad sense.
  • “connected” can be a fixed connection, a detachable connection, or a whole; it can be a direct connection, or Can be indirectly connected through an intermediary.
  • the term “coupling” may be an electrical connection method for signal transmission.
  • “Coupling” can be a direct electrical connection or an indirect electrical connection through an intermediary.
  • the embodiments of this application do not specifically limit the type of electronic equipment.
  • the electronic equipment can be a mobile phone, a pad, a computer with wireless transceiver function, and smart wearable products (for example, smart watches, smart bracelets, earphones, etc.) ), virtual reality (virtual reality, VR) terminal equipment, augmented reality (augmented reality (AR) terminal equipment, etc., have wireless equipment.
  • the above-mentioned electronic devices may also be electronic products such as wireless charging electric vehicles, wireless charging household appliances (such as soymilk machines, sweeping robots), and drones.
  • the following takes the electronic device as a mobile phone as an example to illustrate the implementation principle of wireless charging.
  • Fig. 1 is a schematic diagram of a wireless charging system provided by this application.
  • the wireless charger 02 is used to wirelessly charge the electronic device 01 (ie, mobile phone).
  • the wireless charger 02 shown in the figure supports the electronic device 01 to be placed horizontally above.
  • the wireless charger 02 may also have other forms, such as a vertical wireless charger, with a certain inclination to make the electronic device 01 can lean against the wireless charger 02.
  • the wireless charging system includes a wireless charging (receive, RX) device 20 provided in the electronic device 01 and a battery 50 coupled to the wireless charging receiving device 20.
  • RX wireless charging
  • the wireless charging system also includes a wireless charging transmitting (TX) device 30 arranged in the wireless charger 02, and an adapter 40 coupled to the wireless charging transmitting device 30, and the adapter 40 is used to provide charging power.
  • TX wireless charging transmitting
  • the wireless charging transmitting device 30 performs power transmission to the wireless charging receiving device 20, and at the same time, the wireless charging transmitting device 30 and the wireless charging receiving device 20 communicate with each other through Bluetooth (Bluetooth), wireless broadband (Wireless-Fidelity, WiFi), and Zigbee protocol (Zigbee). ), Radio Frequency Identification (RFID), Long-range (Long Range, Lora) wireless technology, or Near Field Communication (NFC) to achieve wireless connection, so that the wireless charging transmitter 30 and wireless charging receiver Wireless communication can be established between the devices 20.
  • Bluetooth Bluetooth
  • wireless broadband Wireless-Fidelity, WiFi
  • Zigbee protocol Zigbee protocol
  • RFID Radio Frequency Identification
  • Long-range Long Range
  • Lora Long Range
  • NFC Near Field Communication
  • the wireless charging transmitting device 30 and the wireless charging receiving device 20 may transmit control signals or transmit charging data.
  • the charging data can be used to indicate the charging type.
  • the charging data may be a charging protocol, such as the wireless charging standard Qi introduced by the Wireless Power Consortium (WPC), such as the BPP (basic power profile) protocol, or the EPP (extended power profile) protocol, etc. .
  • WPC Wireless Power Consortium
  • BPP basic power profile
  • EPP extended power profile protocol
  • FIG. 2 is a schematic diagram of the structure of the electronic device in FIG. 1.
  • the display screen 10 may be a liquid crystal display (LCD) screen, or an organic light emitting diode (OLED) display screen, etc.
  • LCD liquid crystal display
  • OLED organic light emitting diode
  • the mobile phone may also include Multiple screens, and multiple screens may also be a combination of the above different types of screens, which is not limited in this application.
  • the aforementioned 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 on both 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 by the middle frame 11.
  • the middle frame 11 includes a carrying board 110 and a frame 111 around the carrying board 110.
  • the electronic device 01 may also include printed circuit boards (printed circuit boards, PCB).
  • FIG. 3 is a schematic diagram of another wireless charging system provided by this application.
  • Figure 3 shows a schematic circuit diagram of a wireless charging system.
  • the wireless charger 02 includes a power supply 30, a transmitter controller 301, an inverter 302, a transmitter transceiver 306, a matching capacitor C1, and a transmitter coil L1.
  • 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 can be realized by the adapter 40 in FIG. 1.
  • the inverter 302 is used to convert the direct current output from the power supply 30 into alternating current and output it, so that the transmitting coil L1 generates high-frequency alternating current and emits an alternating magnetic field.
  • the receiving coil L2 outputs alternating current after receiving the above-mentioned alternating magnetic field, and the rectifier 303 converts the alternating current into direct current and then inputs it to the charging circuit 60, and the charging circuit 60 realizes the charging of the battery 50.
  • the battery 50 may be one battery, and in some embodiments, the electronic device may also include multiple batteries.
  • the receiving end transceiver 305 and the transmitting end transceiver 306 may transmit control signals or transmit charging data.
  • the receiving end transceiver 305 can be coupled to the receiving end controller 304, and the receiving end controller 304 can identify the charging protocol sent by the transmitting end transceiver 306 to the receiving end transceiver 305 to determine the charging type of the electronic device 01
  • the charging type may be the first charging type (for example, low-power charging suitable for slow charging) or the above-mentioned charging type may be the second charging type (for example, high-power charging suitable for fast charging).
  • the wireless charger 02 when the wireless charger 02 wirelessly charges the electronic device 01, if there is a metal foreign object between the receiving coil L2 and the transmitting coil L1, there will be a power loss (Ploss). When the power loss exceeds a set threshold When the value is set, the wireless charger 02 will interrupt the power transmission.
  • an embodiment of the present application provides an electronic device that includes at least two coils, one of which is a receiving coil, and the rest are auxiliary coils.
  • the auxiliary coil is added to compensate for the electronic device and wireless charger There is a power loss caused by a horizontal position shift between them.
  • FIG. 4 is a schematic diagram of a wireless charging system corresponding to an electronic device according to an embodiment of the application.
  • the electronic device includes a controller (the receiving end controller 304 in the figure) and at least two coils.
  • At least two coils include a receiving coil L2, and the rest are auxiliary coils.
  • the electronic device includes an auxiliary coil, that is, the first auxiliary coil L3, as an example for illustration.
  • the electronic device may also include multiple auxiliary coils, which will be described in detail in subsequent embodiments.
  • the receiving coil L2 is used to couple the electric energy of the transmitting coil L1 to charge the battery 50 in the electronic device.
  • the actual measured power loss varies with the length of the horizontal position offset between the transmitter coil L1 and the receiver coil L2 as shown in the following table.
  • Table 1 Measurement table of power loss varying with the offset length of the horizontal position
  • the first column of Table 1 is the horizontal position offset length, in millimeters.
  • Table 1 shows that in addition to the stray loss in the fifth column, the other types of losses can be found to vary with the horizontal position offset length. Smaller. The stray loss obviously increases with the increase of the horizontal position offset length, that is, the stray loss has a positive correlation with the horizontal position offset.
  • Figure 5 is a schematic diagram of the distribution of the loss of each part corresponding to the horizontal position offset length in Table 1.
  • Stray loss includes the sum of the eddy current loss of the conductor, the loss of the magnetic shielding material, and the loss caused by other reasons.
  • the accuracy of metal foreign body detection depends on the calculation accuracy of power loss (Ploss).
  • Ploss power loss
  • FIG. 6 is a schematic diagram of the curve of the stray loss varying with the horizontal position offset length provided by an embodiment of the application.
  • the key to realize the stray loss compensation is to compensate the stray loss caused by the horizontal position offset through curve fitting according to the horizontal position offset length information. (The loss caused by the metal foreign body cannot be compensated), thereby improving the accuracy of judging the metal foreign body based on the power loss in the case of wireless charging.
  • the principle and implementation of curve fitting are described in detail below.
  • an auxiliary coil is added to the electronic device, and the coupling relationship between any two coils of the electronic device and the transmitting coil is used to obtain the power loss caused by the horizontal position offset.
  • the coil coupling relationship includes any one of the following: coil mutual inductance, coil coupling coefficient, or voltage of the coil in the electronic device coupled from the transmitting coil, and the coil mutual inductance is proportional to the output voltage of the coil in the electronic device;
  • the coil coupling coefficient is proportional to the output voltage of the coil in the electronic device.
  • the ratio of the coupling relationship between any two coils of the at least two coils of the electronic device and the transmitting coil may be specifically used to obtain the error power, where the error power is the electronic device and the wireless charger There is a positive correlation between the error power and the ratio of the power loss caused by the horizontal position offset between the two.
  • the following first takes the coil coupling relationship as the coil mutual inductance as an example to illustrate the principle of using the receiving coil and the auxiliary coil to obtain the error power in this application.
  • FIG. 7 is a schematic diagram 1 of the principle provided by an embodiment of the application.
  • the wireless charging system includes at least three coils: a transmitting coil L1, a receiving coil L2, and at least one auxiliary coil L3.
  • the number of auxiliary coils is 1 as an example.
  • the mutual inductance of the receiving coil L2 to the transmitting coil L1 is M12, and the mutual inductance of the auxiliary coil L3 to the transmitting coil L1 is M13.
  • 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
  • I1 is the induced current of the auxiliary coil L3 and the receiving coil L2.
  • the magnitude of the mutual inductance determines the magnitude of the induced voltage of the coil, so the ratio of the voltage can also be used to Characterize the ratio of mutual inductance.
  • the horizontal position offset is represented by the offset of the circle center in Figure 7
  • the relative position of the receiving coil L2 and the auxiliary coil L3 is fixed, and the transmitting coil L1 and the auxiliary coil L3
  • the coil L3 also has a corresponding horizontal position offset.
  • the vertical distance in Figure 7 refers to the distance between the plane where the transmitting coil L1 is located and the plane where the receiving coil L2 is located, and this vertical distance is hereinafter referred to as Z To distance.
  • the Z-direction distance may change.
  • the electronic device when covered with different types of protective cases, it may change the plane between the transmitting coil L1 and the receiving coil L2. Z distance between.
  • FIG. 8 is a schematic diagram of a curve of the mutual inductance ratio provided by an embodiment of the application.
  • This figure shows the relationship curve between the ratio of mutual inductance M13 and M12 and the horizontal position offset length of the same electronic device when the Z-direction distance (4mm, 5mm and 6mm respectively) is different. It can be found that when the Z-direction distance is fixed, as the horizontal position offset length between the transmitting coil L1 and the receiving coil L2 increases, the ratio of the mutual inductance M13 to M12 increases accordingly, and the two have a positive correlation.
  • the ratio of mutual inductance M13 to M12 increases.
  • the above situation can correspond to a scenario where a protective cover (protective shell) is installed on an electronic device in practical applications, that is, the thicker the protective shell, the corresponding increase in the Z-direction distance, resulting in a corresponding increase in the ratio of mutual inductance M13 to M12.
  • FIG. 9 is a schematic diagram of a curve of mutual inductance ratio and error power provided by an embodiment of the application.
  • Figure 9 shows the ratio of M13 to M12, taking the Z-direction length (that is, the distance between the transmitting coil L1 and the receiving coil L2) of 6mm, and the center offset (that is, the horizontal position offset length) of 0-10mm as an example.
  • the relationship curve between and stray loss is the relationship curve between and stray loss.
  • y -1.0884x 2 +9.8417x-17.615.
  • x is the ratio of M13 to M12
  • y is the stray loss.
  • the error power is obtained to compensate the stray loss shown in Table 1, and the compensated stray loss is shown in the following table.
  • the output power to the charging circuit in the electronic device in the BPP protocol is 5W
  • the output power to the charging circuit in the electronic device in the EPP protocol can reach 15W.
  • the wireless charger When the power loss reaches the Ploss threshold, the wireless charger will interrupt the power transmission. From the data in Table 2, it can be seen that after the stray loss is compensated by the fitting equation, the stray loss introduced into the wireless charging system due to the horizontal position shift becomes very small, not exceeding 150mW, which is smaller than the wireless charger under the BPP protocol.
  • the power loss threshold for power transmission is 350mW, and is less than the power loss threshold 350mW-750mW at which the wireless charger will interrupt power transmission under the EPP protocol.
  • the wireless charger will not interrupt the power transmission due to the horizontal position offset between the receiving coil of the electronic device and the transmitting coil of the wireless charger when there is no metal foreign body, that is, when the metal foreign body detection is realized by detecting the power loss (Ploss) At this time, the power loss caused by the horizontal position offset between the transmitter coil and the receiver coil has been compensated, and the detection of metal foreign objects can be performed more accurately.
  • fitting equation obtained above is a quadratic equation as an example for description.
  • the fitting equation can also be a linear equation or other forms of equations, depending on the fitting algorithm used. This application The embodiments are not repeated here.
  • the ratio of the output voltages of the receiving coil and the transmitting coil can also be used to obtain the corresponding error power, that is, the ratio of M12 to M13 is obtained.
  • the principle of this implementation method is the same as the above description. No longer.
  • the controller in the embodiment of the present application may be the main processor on the electronic device, or may be other processors on the electronic device.
  • the controller may be the main processor of the mobile phone, that is, the CPU, or other processors, such as other chips with arithmetic control functions.
  • the corresponding relationship between the mutual inductance ratio and the horizontal position offset length of the coil at different Z-direction distances can be measured and determined in advance and stored on the electronic device, for example, can be stored in the memory of the electronic device.
  • fitting equation of the mutual inductance ratio of the coil under each Z-direction distance value can also be predetermined and stored on the electronic device.
  • the controller of the electronic device can obtain the Z-direction distance from the wireless charger, and use the output voltage of the coil to obtain the ratio of the mutual inductance corresponding to the coil, and Call the corresponding relationship between the mutual inductance ratio of the coil corresponding to the current Z-direction distance and the horizontal position offset length, and the fitting equation corresponding to the current Z-direction distance.
  • the controller of the electronic device further obtains the horizontal position offset length corresponding to the current mutual inductance ratio according to the corresponding relationship between the mutual inductance ratio of the coil and the horizontal position offset length, and obtains the stray corresponding to the current mutual inductance ratio according to the fitting equation Loss is the power loss caused by the horizontal position offset between the receiving coil of the electronic device and the transmitting coil of the wireless charger.
  • the receiving end controller 304 uses the output voltage V1 of the receiving coil L2 and the output voltage V2 of the first auxiliary coil L3 to obtain the error power, which is represented by ⁇ P.
  • the controller may use the ratio of the output voltage V1 of the receiving coil L2 and the output voltage V2 of the first auxiliary coil L3 to obtain the ratio of the mutual inductance corresponding to the receiving coil L2 and the first auxiliary coil L3.
  • the input power Pin of the wireless charger can be obtained from the input voltage and input current of the wireless charger.
  • the output power Pout in the electronic device refers to the power output to the charging circuit.
  • the output voltage and input current of the rectifier corresponding to the receiving coil can be used to obtain Pout.
  • the output voltage and output of the first rectifier 303a can be used to obtain Pout.
  • the current obtains the output power Pout.
  • the ratio of the coupling coefficients of the coils at the receiving end may also be used to obtain the error power. Since the coil coupling coefficient is directly proportional to the output voltage of the coil in the electronic device, the ratio of the output voltage of any two coils at the receiving end can still be used to characterize the coil coupling relationship between any two coils and the transmitting coil to obtain the error power. The embodiments of this application will not be repeated here.
  • the role of the auxiliary coil can be determined in the following manner: when other conditions of the electronic device are fixed, directly measure the electronic device including the auxiliary coil, and then measure the electronic device’s feedback power to the wireless charger.
  • the feedback power of the electronic device to the wireless charger can be determined by comparing the difference between the two feedback powers obtained by the two measurements to determine that the auxiliary coil is used to compensate the error power.
  • the error power can be obtained by the coupling relationship between the receiving coil and the auxiliary coil and the transmitting coil respectively; when two auxiliary coils are included, the two auxiliary coils can be used respectively.
  • the coil coupling relationship with the transmitting coil obtains the error power, which represents the power loss caused by the horizontal position offset between the transmitting coil and the receiving coil, and the error power is positively correlated with the ratio.
  • the controller obtains the compensated output power from the output power and the error power, and sends the compensated output power to the wireless charger, so that the wireless charger obtains power loss according to the input power and the compensated output power At this time, the power loss caused by the horizontal position offset between the transmitting coil and the receiving coil in the power loss has been compensated.
  • the electronic device can compensate for the power loss caused by the horizontal position offset between the receiving coil of the electronic device and the transmitting coil of the wireless charger, and the auxiliary coil mainly detects Excitation magnetic flux, that is, the magnetic flux provided by the transmitter coil, is not sensitive to changes in magnetic flux caused by metal foreign objects, so it will not compensate for the power loss caused by metal foreign objects, so that when metal foreign objects are detected, the transmitter coil and receiving
  • the horizontal position offset between the coils leads to the loss that is considered to be caused by metal foreign objects, which avoids the wrong determination of the existence between the transmitting coil and the receiving coil when there is no metal foreign object between the transmitting coil and the receiving coil but there is a horizontal position deviation Metal foreign body, therefore, also improves the accuracy of metal foreign body detection.
  • FIG. 10 is a schematic diagram of a wireless charging system corresponding to another electronic device according to an embodiment of the application.
  • the electronic device includes a receiving coil L2 and a first auxiliary coil L3, and also includes a first rectifier 303a connected to the receiving coil L2, and a second rectifier 303b connected to the first auxiliary coil L3.
  • the controller can use the ratio of the output voltage of the receiving coil L2 to the output voltage of the first auxiliary coil L3 to obtain the error power.
  • the output voltage of the coil is an AC voltage, and the controller can obtain the corresponding error power according to the ratio of the peak value of the output voltage of the two coils or the ratio of the effective value of the output voltage of the two coils, which is not specifically limited in the embodiment of the present application.
  • the ratio of the DC output voltages corresponding to the two coils can be used.
  • the controller is used to determine the ratio of the first output voltage V1 of the first rectifier 303a and the second output voltage V2 of the second rectifier 303b. The ratio obtains the error power.
  • the receiving end controller 304 can also use Requ and Iout to determine the first The first output voltage V1 of the rectifier 303a is compensated, and the compensated output voltage V1' is obtained by the following formula:
  • V1’ V1+Requ ⁇ Iout (1)
  • the Requ in formula (1) is the preset impedance, which can be determined in advance and stored in the electronic device, 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, and then obtains the ratio of the compensated voltage V1' to the second voltage V2, and obtains the corresponding error according to the ratio
  • the influence of the impedance of the electronic device on the error power ⁇ P can be reduced, so that the compensated output power Prx obtained by the receiving-end controller 304 is more accurate , In turn, the power loss obtained by the transmitter controller can be more accurate, thereby further improving the accuracy of metal foreign body detection.
  • FIG. 11 is a schematic diagram of a coil of an electronic device according to an embodiment of the application.
  • the receiving coil L2 can be arranged on the radially inner circumference of the first auxiliary coil L3.
  • the first end 2 and the second end 3 of the receiving coil L2 are located between the first end 1 and the second end 4 of the first auxiliary coil L3.
  • the first auxiliary coil L3 may be a one-turn coil or a multi-turn coil.
  • the ends of the multi-turn are connected in parallel or in series.
  • the receiving coil L2 and the first auxiliary coil L3 are located on the same plane, so the thickness of the coil module of the electronic device will not be increased, thereby facilitating the thinner and lighter electronic device.
  • the center of the receiving coil L2 and the center of the first auxiliary coil L3 coincide. That is, when the receiving coil L2 and the first auxiliary coil L3 are toroidal windings, the centers of the circles coincide when the receiving coil L2 and the first auxiliary coil L3 are arranged.
  • the geometric center points of the receiving coil L2 and the first auxiliary coil L3 are arranged to coincide.
  • FIG. 12A is a schematic diagram of a coil of another electronic device according to an embodiment of the application.
  • the first auxiliary coil L3 is arranged on the radially inner circumference of the receiving coil L2.
  • the first end 2 and the second end 3 of the receiving coil L2 are located between the first end 1 and the second end 4 of the first auxiliary coil L3.
  • FIG. 12B is a schematic diagram of a coil of another electronic device provided by an embodiment of the application.
  • a part of the first auxiliary coil L3 is disposed on the radially inner circumference of the receiving coil L2, and the other part is disposed on the radially outer circumference of the receiving coil L2.
  • the first end 2 and the second end 3 of the receiving coil L2 are located between the first end 1 and the second end 4 of the first auxiliary coil L3.
  • the controller can also obtain the horizontal position offset between the transmitting coil L1 and the receiving coil L2 according to the obtained ratio, that is, obtain the horizontal position offset length.
  • the receiving end controller 304 may determine the error power at this time from the fitting equation, and then obtain the horizontal offset from the predetermined corresponding relationship between the error power and the horizontal offset (corresponding relationship between the horizontal position offset length).
  • the predetermined corresponding 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 looking up the table.
  • FIG. 13 is a schematic diagram of a prompt when a horizontal position shift occurs according to an embodiment of the application.
  • the electronic device 01 may also include a display screen.
  • the controller can also send the horizontal position offset to the display screen for display, to prompt that the relative position of the electronic device and the wireless charger needs to be corrected at this time.
  • the controller when the controller controls the display screen to display the horizontal position offset, it may further control the electronic device to give prompts by means of vibration, voice, ringtone, etc.
  • the wireless charger 02 may also have a signal lamp with a prompt function.
  • the signal lamp is used to prompt when a horizontal position shift occurs, for example, it may flash or switch to a preset color for prompt when a horizontal position shift occurs.
  • the signal light can also be used to prompt when the controller of the wireless charger (ie, the transmitter controller) determines that there is a metal foreign object between the transmitter coil and the receiver coil.
  • the controller of the electronic device can obtain the error power according to the ratio of the output voltage of the receiving coil and the first auxiliary coil, or according to the first output voltage of the first rectifier and the second output voltage.
  • the ratio of the second output voltage of the rectifier obtains the error power, which represents the power loss caused by the horizontal position offset between the transmitting coil and the receiving coil, and the error power is positively correlated with the ratio.
  • the controller obtains the compensated output power from the output power and the error power, and sends the compensated output power to the wireless charger, so that the wireless charger obtains power loss according to the input power and the compensated output power Since the power loss caused by the horizontal position offset between the transmitting coil and the receiving coil in the power loss has been compensated, the accuracy of the detection of metal foreign objects using this power loss is higher.
  • the controller 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, it can also use the preset impedance and the output current of the first rectifier to measure the first voltage. Compensation, in turn, can reduce the influence of the impedance of the electronic device on the error power, so that the compensated output power obtained by the receiving end controller is more accurate, and the power loss obtained by the transmitting end controller can be more accurate, thus further improving the detection of metal foreign objects Accuracy.
  • the electronic device includes a receiving coil and an auxiliary coil as an example.
  • the ratio is the ratio of the voltage corresponding to the receiving coil and the auxiliary coil.
  • the electronic device includes two auxiliary coils. The ratio of the voltage is obtained for error power compensation.
  • FIG. 14 is a schematic diagram of another wireless charging system corresponding to an electronic device according to an embodiment of the 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.
  • the receiving end controller 304 is configured to use the ratio of the output voltage of the first auxiliary coil L3 to the output voltage of the second auxiliary coil L4 to obtain the error power.
  • the output voltage of the coil is an AC voltage, and the controller can obtain the corresponding error power according to the ratio of the peak value of the output voltage of the two coils or the ratio of the effective value of the output voltage of the two coils, which is not specifically limited in the embodiment of the present application.
  • the controller is used to obtain the error power ⁇ P according to the ratio of the output voltage V2 of the second rectifier 303b and the output voltage V3 of the third rectifier 303c, and obtain the error power ⁇ P from the output power Pout and the error power ⁇ P.
  • the receiving end controller 304 sends the compensated output power Prx to the wireless charger, so that the wireless charger obtains the power loss Ploss according to the input power Pin and the compensated output power Prx.
  • Ploss Pin-Prx.
  • FIG. 15 is a schematic diagram of a coil of still another electronic device provided by an embodiment of the application.
  • the first auxiliary coil L3 and the second auxiliary coil L4 are respectively located at the radial inner circumference and the radial outer circumference of the receiving coil L2.
  • the first end 1 and the second end 4 of the second auxiliary coil L4 are at the outermost periphery
  • the first end 2 of the receiving coil L2 is at the first end 1 of the second auxiliary coil L4 and the first end 4 of the first auxiliary coil L3.
  • the second end 3 of the receiving coil L2 is between the second end 4 of the second auxiliary coil L4 and the second end 6 of the first auxiliary coil L3.
  • first auxiliary coil L3 and the second auxiliary coil L4 may also be located in the radial inner circumference of the receiving coil L2; the first auxiliary coil L3 and the second auxiliary coil L4 may also be located in the receiving coil.
  • the receiving coil L2, the first auxiliary coil L3, and the second auxiliary coil L4 are located on the same plane, so the thickness of the coil module of the electronic device is not increased, thereby facilitating the thinner and lighter electronic device.
  • the center of the receiving coil L2, the center of the first auxiliary coil L3, and the center of the second auxiliary coil L4 coincide. That is, when the receiving coil L2, the first auxiliary coil L3, and the second auxiliary coil L4 are toroidal windings, the centers of the receiving coil L2, the first auxiliary coil L3, and the second auxiliary coil L4 coincide when they are set. When there are other non-circular coils in the receiving coil L2, the first auxiliary coil L3 and the second auxiliary coil L4, such as square coils, the geometric centers of the receiving coil L2, the first auxiliary coil L3 and the second auxiliary coil L4 Points coincide.
  • the first auxiliary coil L3 and the second auxiliary coil L4 may have one turn or multiple turns. When there are multiple turns, the ends of the multiple-turn coils are connected in parallel or connected in series.
  • the number of turns of the first auxiliary coil L3 and the second auxiliary coil L4 may be the same or different, which is not specifically limited in the embodiment of the present application. Take the coil diagram shown in Fig. 15 as an example. The end position of the auxiliary coil is the position marked 1456 in the figure. When the ends of the multi-turn coil are connected in series, the end corresponding to the label 6 can be connected in series with the end corresponding to the label 1.
  • the end corresponding to the label 6 can be connected to the end corresponding to the label 3
  • the end corresponding to the label 5 can be connected to the end corresponding to the label 1 to realize the parallel connection of the inner and outer coils.
  • the controller can also determine the horizontal position offset between the transmitting coil L1 and the receiving coil L2 according to the obtained ratio, that is, obtain the horizontal position offset length.
  • the receiving end controller 304 may determine the error power at this time from the fitting equation, and then determine the horizontal offset from the predetermined corresponding relationship between the error power and the horizontal offset (corresponding relationship between the horizontal position offset length).
  • the predetermined corresponding 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 from the current error power to the drink may be determined by looking up the table.
  • the electronic device may further include a display screen, and the controller can also send the horizontal position offset to the display screen for display, to prompt that the relative position of the electronic device and the wireless charger needs to be corrected at this time.
  • the controller when the controller controls the display screen to display the horizontal position offset, it may further control the electronic device to give prompts by means of vibration, voice, ringtone, etc.
  • the controller of the electronic device can obtain the error power according to the ratio of the output voltage of the first auxiliary coil and the second auxiliary coil, or according to the output voltage of the second rectifier and the third
  • the ratio of the output voltage of the rectifier obtains the error power, which represents the power loss caused by the horizontal position offset between the transmitting coil and the receiving coil, and the error power is positively correlated with the ratio.
  • the controller obtains the compensated output power from the output power and the error power, and sends the compensated output power to the wireless charger so that the wireless charger obtains power loss according to the input power and the compensated output power. In this power loss, the power loss caused by the horizontal position offset between the transmitting coil and the receiving coil has been compensated, so the accuracy of the detection of metal foreign objects using this power loss is higher.
  • the controller obtains the error power according to the ratio of the output voltage of the second rectifier to the output voltage of the third rectifier, since the first auxiliary coil and the second auxiliary coil are not used to charge the battery 50, that is, the second The output voltage of the rectifier and the output voltage of the third rectifier are not affected by the voltage drop caused by the load current, so there is no need to compensate the output voltage of the rectifier.
  • an embodiment of the present application also provides a power compensation method, which is applied to electronic equipment for wireless charging, which will be described in detail below with reference to the accompanying drawings.
  • FIG. 16 is a schematic diagram of a power compensation method provided by an embodiment of the application.
  • the method is applied to an electronic device for wireless charging.
  • the electronic device includes a controller, at least two coils, and a transceiver.
  • the at least two coils include a receiving coil, and the rest are auxiliary coils.
  • the receiving coil is used to couple the electric energy of the transmitting coil to charge the battery in the electronic device.
  • the auxiliary coil is used to compensate the power loss caused by the horizontal position offset between the electronic device and the wireless charger.
  • the principle of this method is to use the coupling relationship between any two coils of the at least two coils of the electronic device and the transmitting coil to obtain the error power, wherein the coil coupling relationship includes any one of the following: coil mutual inductance, coil coupling Coefficient or the magnitude of the voltage coupling the coil in the electronic device from the transmitting coil; the coil mutual inductance is proportional to the output voltage of the coil in the electronic device; the coil coupling coefficient is proportional to the output voltage of the coil in the electronic device The voltage is proportional.
  • the ratio of the coupling relationship between any two coils of the at least two coils and the transmitting coil may be used to obtain the error power, and there is a positive correlation between the error power and the ratio.
  • the electronic device may include a memory and one or more computer programs, wherein the one or more computer programs are stored in the memory, and the one or more computer programs include instructions.
  • the electronic device is caused to execute the following steps:
  • S1601 The electronic device is placed on the wireless charger to start wireless charging.
  • S1602 The controller of the electronic device obtains the vertical distance between the plane where the transmitting coil is located and the plane where the receiving coil is located.
  • This vertical distance is the Z-direction distance described in the above embodiments.
  • the controller of the electronic device obtains the corresponding relationship between the mutual inductance ratio of the coil corresponding to the vertical distance and the horizontal position offset length, and obtains the fitting equation of the mutual inductance ratio corresponding to the vertical distance.
  • the corresponding relationship between the mutual inductance ratio and the horizontal position offset length of the coils at different vertical distances can be measured and determined in advance and then stored on the electronic device, for example, can be stored on the memory of the electronic device.
  • fitting equation of the mutual inductance ratio of the coil at each vertical distance may also be predetermined and stored on the electronic device, for example, it may be stored on the memory of the electronic device.
  • the controller of the electronic device uses the output voltages of any two coils of the at least two coils to obtain the mutual inductance ratios corresponding to the coils.
  • the controller uses the ratio of the output voltages of any two of the at least two coils to obtain the error power.
  • S1604 specifically uses the ratio of the output voltage of the receiving coil and the output voltage of the first auxiliary coil to obtain the error power.
  • the output voltage of the coil is an AC voltage.
  • the corresponding error power can be obtained according to the ratio of the peak value of the output voltage of the two coils or the ratio of the effective value of the output voltage of the two coils. Specific restrictions.
  • the electronic device further includes a first rectifier connected to the receiving coil, and a second rectifier connected to the first auxiliary coil.
  • S1604 is specifically obtaining 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 current output by the receiving coil needs to charge the battery, a voltage drop will be generated when the load current flows through the receiving coil L2, the capacitor C2, and the first rectifier of the electronic device, which in turn affects the performance of the first rectifier obtained.
  • the accuracy of the first output voltage Therefore, in order to compensate for the error caused by the load current to the voltage, the equivalent resistance of the receiving coil L2, the capacitor C2 and the first rectifier of the electronic device is represented by Requ, and the output current of the electronic device is Iout, Then, the first output voltage V1 of the first rectifier can be compensated by Requ and Iout to obtain the compensated output voltage V1'.
  • V1' V1+Requ ⁇ Iout.
  • the electronic device includes a receiving coil, a first auxiliary coil, and a second receiving coil.
  • S1604 specifically uses the ratio of the output voltage of the first auxiliary coil and the output voltage of the second auxiliary coil to obtain the error power.
  • the output voltage of the coil is an AC voltage.
  • the corresponding error power can be obtained according to the ratio of the peak value of the output voltage of the two coils or the ratio of the effective value of the output voltage of the two coils. There is no specific limitation.
  • the electronic device further includes a first rectifier connected to the receiving coil, a second rectifier connected to the first auxiliary coil, and a third rectifier connected to the second auxiliary coil.
  • S1604 at this time specifically refers to obtaining the error power according to the ratio of the output voltage of the second rectifier to the output voltage of the third rectifier.
  • S1605 The controller of the electronic device uses the mutual inductance ratio to determine to obtain the error power according to the fitting equation of the mutual inductance ratio obtained in S1603.
  • S1606 The controller of the electronic device uses the mutual inductance ratio to determine the current horizontal position offset length between the electronic device and the wireless charger according to the corresponding relationship between the mutual inductance ratio and the horizontal position offset length obtained in S1603.
  • S1607 The controller of the electronic device sends the horizontal position offset to the display screen for display.
  • the horizontal position offset can also be sent to the display screen for display, to prompt that the relative position of the electronic device and the wireless charger needs to be corrected at this time.
  • the controller controls the display screen to display the horizontal position offset, it may further control the electronic device to give prompts by means of vibration, voice, ringtone, etc.
  • the signal light on the wireless charger 02 is used to prompt when there is a horizontal position shift.
  • the signal light can also be used to prompt when the controller of the wireless charger (ie, the transmitter controller) determines that there is a metal foreign object between the transmitter coil and the receiver coil.
  • S1608 The controller of the electronic device obtains the compensated output power from the output power and the error power, and sends the compensated output power to the transceiver.
  • the error power is represented by ⁇ P
  • the output power is represented by Pout
  • the compensated output power Prx Pout+ ⁇ P.
  • S1609 The transceiver of the electronic device sends 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 method provided by the embodiment of the present application uses the coupling relationship between any two coils of the electronic device and the transmitter coil to obtain the error power, that is, when only one auxiliary coil is included, the receiving coil and the auxiliary coil can be used.
  • the error power is obtained by the coil coupling relationship with the transmitting coil respectively; when two auxiliary coils are included, the error power can be obtained by using the coupling relationship between the two auxiliary coils and the transmitting coil respectively, and the error power is characterized by the transmitting coil and The power loss caused by the horizontal position offset between the receiving coils, and the error power is positively correlated with the ratio.
  • the compensated output power is obtained from the output power and the error power, and the compensated output power is sent to the transceiver, and then sent to the wireless charger by the transceiver, so that the wireless charger is based on the input power and the compensated output power. After the output power obtains the power loss.
  • the power loss caused by the horizontal position offset between the transmitting coil and the receiving coil in the power loss has been compensated. Therefore, when metal foreign body detection is performed, the loss caused by the horizontal position offset between the transmitter coil and the receiving coil will not be recognized as the loss caused by the metal foreign body, and it is avoided that there is no metal foreign body between the transmitter coil and the receiving coil. When there is a horizontal position shift, it is incorrectly determined that there is a metal foreign body between the transmitter coil and the receiving coil, so the accuracy of the metal foreign body detection is also improved.
  • an embodiment of the present application also provides a wireless charging system, which will be described in detail below with reference to the accompanying drawings.
  • FIG. 17 is a schematic diagram of a wireless charging system provided by an embodiment of the 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 transmitter controller, an inverter, a transmitter transceiver, a matching capacitor, and a transmitter coil.
  • the electronic device 01 includes a receiving coil, at least one auxiliary coil, a matching capacitor, a rectifier, a receiving end controller, a receiving end transceiver, a charging circuit, and a battery.
  • the power supply can be realized by the adapter in Figure 1.
  • the inverter is used to convert the direct current output by the power supply into alternating current and output it, so that the transmitting coil generates high-frequency alternating current and emits an alternating magnetic field.
  • the receiving coil outputs alternating current after receiving the above-mentioned alternating magnetic field, and the rectifier converts the alternating current into direct current and then inputs it to the charging circuit, and the charging circuit realizes the charging of the battery.
  • the electronic device also includes a memory and one or more computer programs, wherein the one or more computer programs are stored in the memory, and the one or more computer programs include instructions.
  • the electronic device is caused to execute the steps recorded in the above method embodiments.
  • the controller at the receiving end uses the coupling relationship between any two coils of the at least two coils at the receiving end and the transmitting coil to obtain the error power.
  • the coil coupling relationship includes any of the following: coil mutual inductance, coil coupling coefficient, or the electronic The magnitude of the voltage coupling the coil in the device from the transmitting coil; the mutual inductance of the coil is proportional to the output voltage of the coil in the electronic device; and the coil coupling coefficient is proportional to the output voltage of the coil in the electronic device.
  • the controller uses the ratio of the coupling relationship between any two coils of the at least two coils and the transmitting coil to obtain the error power, and the error power has a positive correlation with the ratio.
  • the compensated output power is obtained from the output power and the error power, and the compensated output power is sent to the transceiver at the receiving end.
  • the transceiver at the receiving end sends the compensated output power to the transceiver of the wireless charger, so that the controller of the wireless charger 02 obtains the power loss Ploss according to the input power Pin and the compensated output power Prx.
  • Ploss Pin-Prx.
  • the value of the preset power threshold is related to the output power. For example, see Table 3 in the above description. Different output powers correspond to different Ploss thresholds (ie, preset power thresholds).
  • the electronic device 01 can specifically be a mobile phone (mobile phone), a tablet computer (pad), a computer with wireless transceiver function, smart wearable products (for example, smart watches, smart bracelets, headsets, etc.), virtual reality (VR) Terminal devices, augmented reality (AR) terminal devices, etc. have wireless devices.
  • the above-mentioned electronic devices may also be electronic products such as wireless charging electric vehicles, wireless charging household appliances (such as soymilk machines, sweeping robots), and drones.
  • the wireless charger 02 corresponds to the electronic device 01.
  • the wireless charger 02 may be a horizontal mobile phone wireless charger or a vertical mobile phone wireless charger.
  • the wireless charging system at this time can be seen in Figure 1.
  • the power loss between the transmitter coil and the receiver coil is due to the horizontal position deviation between the transmitter coil and the receiver coil
  • the receiving coil and auxiliary coil of the electronic device have different mutual inductances to the transmitting coil.
  • the corresponding relationship between the ratio of the mutual inductance corresponding to the coil of the electronic device and the horizontal position offset can be determined by measuring in advance, and the horizontal position offset corresponds to The power loss caused can be measured and determined in advance, and then the error power caused by the horizontal position offset can be determined by the ratio of the mutual inductance corresponding to the coil of the electronic device, and the induced voltage of the coil of the electronic device is proportional to the corresponding mutual inductance, so it can be passed The output voltage of the coil of the electronic device obtains the ratio of the corresponding mutual inductance between the coils of the electronic device.
  • the controller of the electronic device of the wireless charging system can obtain the error power according to the coupling relationship between any two coils and the transmitting coil respectively, that is, when only one auxiliary coil is included, the receiving coil and the auxiliary coil can be used.
  • the error power represents the difference between the transmitter coil and the receiver coil.
  • the power loss caused by the horizontal position offset between the two, the error power is positively correlated with the ratio.
  • the controller obtains the compensated output power from the output power and the error power, and sends the compensated output power to the wireless charger, so that the wireless charger obtains 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 in the power loss has been compensated.
  • the loss due to the horizontal position offset between the transmitter coil and the receiver coil will not be recognized as the loss caused by the metal foreign body, which avoids that there is no metal foreign body between the transmitter coil and the receiver coil.
  • the accuracy of the metal foreign body detection is also improved.
  • the receiving coil and the auxiliary coil are arranged on the same plane, the thickness of the coil module will not be increased, and it is also convenient for the electronic device to be lighter and thinner, and has high practicability.
  • the transmitter controller and the receiver controller described in the embodiments of the present application may be an application-specific integrated circuit (ASIC), a programmable logic device (PLD), or a combination thereof.
  • ASIC application-specific integrated circuit
  • PLD programmable logic device
  • the above-mentioned PLD can be a complex programmable logic device (CPLD), a field-programmable gate array (FPGA), a general array logic (generic array logic, GAL) or any combination thereof.
  • CPLD complex programmable logic device
  • FPGA field-programmable gate array
  • GAL general array logic
  • the application examples are not specifically limited.
  • At least one (item) refers to one or more, and “multiple” refers to two or more.
  • “And/or” is used to describe the association relationship of associated objects, indicating that there can be three types of relationships, for example, “A and/or B” can mean: only A, only B, and both A and B , Where A and B can be singular or plural.
  • the character “/” generally indicates that the associated objects before and after are in an “or” relationship.
  • the following at least one item (a) or similar expressions refers to any combination of these items, including any combination of a single item (a) or a plurality of items (a).
  • At least one of a, b, or c can mean: a, b, c, "a and b", “a and c", “b and c", or "a and b and c" ", where a, b, and c can be single or multiple.

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  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

本申请公开了一种电子设备、方法及无线充电系统，涉及无线充电技术领域。该设备包括控制器、收发器和至少两个线圈；至少两个线圈中包括一个接收线圈和一个或者多个辅助线圈。接收线圈耦合无线充电器的发射线圈的电能为电池充电。辅助线圈补偿电子设备和无线充电器之间的水平位置偏移引起的功率损耗。控制器利用任意两个线圈分别与发射线圈的线圈耦合关系获得误差功率，由输出功率和误差功率获得补偿后的输出功率，将补偿后的输出功率发送给收发器。收发器将补偿后的输出功率发送给无线充电器，以使无线充电器根据输入功率和补偿后的输出功率获得功率损耗。该设备能够补偿因为电子设备和无线充电器之间存在水平位置偏移而导致的功率损耗。

Description

一种电子设备、方法及无线充电系统
本申请要求于2020年04月17日提交中国国家知识产权局、申请号为202010305431.4、发明名称为“一种电子设备、方法及无线充电系统”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及无线充电技术领域，尤其涉及一种电子设备、方法及无线充电系统。
背景技术
无线充电技术(wireless charging technology，WCT)利用电场、磁场、微波或者激光等传导介质以实现电能的无线传输，由于其具有无导线限制、无插拔等优势，目前在电子设备上的应用越来越广泛。
无线充电系统应用无线充电技术，包括电子设备和无线充电器，无线充电器对电子设备进行无线充电。若电子设备和无线充电器的功率传输线圈模组(即电子设备的接收线圈和无线充电器的发射线圈)之间存在金属异物，会导致出现功率损耗(Ploss)，若当功率损耗超过设定的门限值，无线充电器会中断功率传输。
然而，目前的电子设备例如手机、智能手表等进行无线充电时，电子设备和无线充电器之间的功率传输可能出现功率损耗，该功率损耗可能由于存在金属异物导致，也可能由于电子设备和无线充电器之间的功率传输线圈模组出现水平位置偏移导致，若功率损耗超过设定的门限值，无线充电器即中断功率传输。
发明内容
为了解决以上技术问题，本申请提供一种电子设备、方法及无线充电系统，能够补偿因为电子设备的接收线圈和无线充电器的发射线圈之间存在水平位置偏移而导致的功率损耗。
第一方面，本申请提供了一种电子设备，包括：控制器、收发器和至少两个线圈。至少两个线圈中包括一个接收线圈，和一个或者多个辅助线圈。接收线圈用于耦合无线充电器的发射线圈的电能为所述电子设备中的电池充电；辅助线圈用于补偿电子设备和无线充电器之间的水平位置偏移引起的功率损耗。控制器利用至少两个线圈中任意两个线圈分别与发射线圈的线圈耦合关系获得误差功率，由电子设备中给充电电路的输出功率和误差功率获得补偿后的输出功率，将补偿后的输出功率发送给所述收发器。收发器将补偿后的输出功率发送给无线充电器，以使无线充电器根据无线充电器的输入功率和补偿后的输出功率获得功率损耗。充电电路是电子设备内部的电路，用于给电池进行充电。
当只包括一个辅助线圈时，可以利用接收线圈和辅助线圈分别与发射线圈的线圈耦合关系获得误差功率；当包括两个辅助线圈时，可以利用两个辅助线圈分别与发射线圈的线圈耦合关系获得误差功率。
由于磁场能量耦合时，发射能量的线圈与接收能量的线圈之间的耦合关系决定了 接收能量的线圈耦合到的电压的大小，一般线圈耦合关系可以用线圈耦合系数或线圈互感来表示，又由于线圈耦合系数与接收能量的线圈耦合的电压成正比，线圈互感与接收能量的线圈耦合的电压成正比，因此，一定程度上，接收能量的线圈耦合的电压大小也可以表示线圈耦合关系。本申请实施例中利用线圈耦合关系的比值获得误差功率，在一些实施例中，也可以利用接收能量的线圈耦合的电压的比值获得误差功率。
利用该电子设备，能够补偿因为电子设备的接收线圈和无线充电器的发射线圈之间存在水平位置偏移而导致的功率损耗。此外，还能使得在进行金属异物检测时，不会将由于发射线圈与接收线圈之间的水平位置偏移导致认定为是由金属异物引起的损耗，避免了在发射线圈与接收线圈之间无金属异物但存在水平位置偏移时错误的判定发射线圈与接收线圈之间存在金属异物，因此还提升金属异物检测的准确度。
结合第一方面，在第一种可能的实现方式中，线圈耦合关系包括以下任意一种：线圈互感、线圈耦合系数或电子设备中的线圈从发射线圈耦合的电压大小。线圈互感与电子设备中线圈的输出电压成正比，线圈耦合系数与电子设备中线圈的输出电压成正比。因此可以利用电子设备中线圈的输出电压的比值表征电子设备的线圈分别与发射线圈的线圈互感的比值或线圈耦合系数的比值。
结合第一方面，在第二种可能的实现方式中，控制器利述至少两个线圈中任意两个线圈分别与发射线圈的线圈耦合关系获得误差功率，具体为：控制器至少两个线圈中任意两个线圈分别与发射线圈的线圈耦合关系的比值获得误差功率，误差功率与所述比值存在正相关的对照关系。
结合第一方面，在第三种可能的实现方式中，至少两个线圈包括：接收线圈和第一辅助线圈。控制器利用至少两个线圈中任意两个线圈分别与所述发射线圈的线圈耦合关系的比值获得误差功率，具体包括：控制器利用接收线圈的输出电压和第一辅助线圈的输出电压的比值获得误差功率。
此时在电子设备上增加一个辅助线圈，利用该辅助线圈与电子设备的接收线圈实现对电子设备和无线充电器之间的水平位置偏移而导致的功率损耗的补偿。
结合第一方面，在第四种可能的实现方式中，至少两个线圈包括：接收线圈和第一辅助线圈，电子设备还包括与接收线圈连接的第一整流器，和与第一辅助线圈连接的第二整流器。控制器用于利用至少两个线圈中任意两个线圈分别与发射线圈的线圈耦合关系的比值获得误差功率，具体为：控制器用于根据第一整流器的第一输出电压和第二整流器的第二输出电压的比值获得误差功率。此时，整流器的输出电压为直流电压，便于采集。
结合第一方面，在第五种可能的实现方式中，控制器还用于根据预设阻抗和第一整流器的输出电流对第一输出电压进行补偿，并获得补偿后的电压与第二电压的比值。
通过对第一输出电压进行补偿，够降低电子设备的阻抗对误差功率的影响，使得接收端控制器获取的补偿后的输出功率更加准确，进而使得发射端控制器获取的功率损耗能够更加准确，因此进一步提升金属异物检测的精度。
结合第一方面，在第六种可能的实现方式中，至少两个线圈包括：接收线圈、第 一辅助线圈和第二辅助线圈。控制器利用所述至少两个线圈中任意两个线圈分别与发射线圈的线圈耦合关系的比值获得误差功率，具体为：控制器利用第一辅助线圈的输出电压和第二辅助线圈的输出电压的比值获得误差功率。
该实现方式的第一辅助线圈和第二辅助线圈并不用于为电子设备的电池进行充电，即第二整流器的输出电压和第三整流器的输出电压不受负载电流引起的压降的影响，因此不需要对整流器的输出电压进行补偿。
结合第一方面，在第七种可能的实现方式中，至少两个线圈包括：接收线圈、第一辅助线圈和第二辅助线圈，电子设备还包括与接收线圈连接的第一整流器、与第一辅助线圈连接的第二整流器和与第二辅助线圈连接的第三整流器。控制器利用至少两个线圈中任意两个线圈分别与发射线圈的线圈耦合关系的比值获得误差功率，具体包括：控制器根据第二整流器的输出电压和第三整流器的输出电压的比值获得误差功率。此时，整流器的输出电压为直流电压，便于采集。
结合第一方面以及以上任意一种可能的实现方式，在第八种可能的实现方式中，接收线圈和所述辅助线圈位于同一个平面，因此设置辅助线圈不会增加线圈模组的厚度。
结合第一方面以及以上任意一种可能的实现方式，在第九种可能的实现方式中，所述接收线圈的中心和所述辅助线圈的中心重合，进而便于准确确定接收线圈和发射线圈的水平位置偏移。
结合第一方面以及以上任意一种可能的实现方式，在第十种可能的实现方式中，所述接收线圈与所述辅助线圈的位置为以下任意一种：辅助线圈位于接收线圈的径向内围、辅助线圈位于接收线圈的径向外围、所述辅助线圈的不同部分分别位于接收线圈的径向内围和径向外围。
结合第一方面以及以上任意一种可能的实现方式，在第十一种可能的实现方式中，辅助线圈至少包括以下两个：第一辅助线圈和第二辅助线圈。接收线圈与辅助线圈的位置为以下任意一种：第一辅助线圈和第二辅助线圈均位于接收线圈的径向内围、第一辅助线圈和第二辅助线圈均位于接收线圈的径向外围、第一辅助线圈和第二辅助线圈分别位于接收线圈的径向内围和径向外围。
结合第一方面以及以上任意一种可能的实现方式，在第十二种可能的实现方式中，所述辅助线圈为一匝或多匝；当辅助线圈为多匝时，多匝线圈的端头并联在一起或串联在一起。
结合第一方面以及以上任意一种可能的实现方式，在第十三种可能的实现方式中，控制器还用于根据比值获得发射线圈与接收线圈之间的水平位置偏移，比值与水平位置偏移正相关。
结合第一方面以及以上任意一种可能的实现方式，在第十四种可能的实现方式中，该电子设备还包括：显示屏。控制器还用于将水平位置偏移发送给所述显示屏进行显示，以提示此时需要对电子设备和无线充电器的相对位置进行校正。此外，在一些实施例中，控制器控制显示屏显示所述水平位置偏移时，还可以进一步控制电子设备通 过震动、语音、铃声等方式进行提示。
结合第一方面以及以上任意一种可能的实现方式，在第十五种可能的实现方式中，控制器还用于获得电子设备和无线充电器的垂直距离，根据垂直距离获得对应的所述对照关系。这是由于实际应用中，电子设备和无线充电器之间的垂直距离可能变化，例如电子设备可能安装有厚度不同的保护壳。此时根据当前的垂直距离获取对应的所述对照关系，进而能够更加准确的获取对应的误差功率，使得对发射线圈和接收线圈之间的水平位置偏移引起的功率损耗的补偿更加准确。
在一些实施例中，不同的垂直距离取值下的线圈的互感比值的拟合方程也可以预先确定并存储在电子设备上。此时，当电子设备放置在无线充电器上进行无线充电时，电子设备的控制器可以获取和无线充电器之间的垂直距离，以及利用线圈的输出电压获取线圈对应的互感的比值，并调用当前的垂直距离对应的线圈的互感比值和水平位置偏移长度的对应关系，以及当前的垂直距离对应的拟合方程。电子设备的控制器进一步根据该线圈的互感比值和水平位置偏移长度的对应关系，获取当前互感的比值对应的水平位置偏移长度，并根据拟合方程获取当前的互感的比值对应的杂散损耗，即获得了电子设备的接收线圈和无线充电器的发射线圈之间存在水平位置偏移而导致的功率损耗。
第二方面，本申请实施例还提供了一种功率补偿方法，该方法应用于无线充电的电子设备，该电子设备包括：存储器、控制器和至少两个线圈；所述至少两个线圈中包括一个接收线圈，和一个或者多个辅助线圈；以及一个或多个计算机程序，其中所述一个或多个计算机程序被存储在所述存储器中，所述一个或多个计算机程序包括指令，当所述指令被所述电子设备执行时，使得所述电子设备执行以下步骤：
根据所述至少两个线圈中任意两个线圈分别与发射线圈的线圈耦合关系获得误差功率；
由所述电子设备中给充电电路的输出功率和所述误差功率获得补偿后的输出功率；
将所述补偿后的输出功率发送给所述无线充电器，以使所述无线充电器根据所述无线充电器的输入功率和所述补偿后的输出功率获得功率损耗。
利用该方法，能够补偿因为电子设备的接收线圈和无线充电器的发射线圈之间存在水平位置偏移而导致的功率损耗。此外，还能使得在进行金属异物检测时，不会将由于发射线圈与接收线圈之间的水平位置偏移导致认定为是由金属异物引起的损耗，避免了在发射线圈与接收线圈之间无金属异物但存在水平位置偏移时错误的判定发射线圈与接收线圈之间存在金属异物，因此还提升金属异物检测的准确度。
结合第二方面，在第一种可能的实现方式中，线圈耦合关系包括以下任意一种：线圈互感、线圈耦合系数或所述电子设备中的线圈从所述发射线圈耦合的电压大小；所述线圈互感与所述电子设备中线圈的输出电压成正比；所述线圈耦合系数与所述电子设备中线圈的输出电压成正比。
结合第二方面，在第二种可能的实现方式中，利用至少两个线圈中任意两个线圈分别与发射线圈的线圈耦合关系获得误差功率，具体包括：利用至少两个线圈中任意 两个线圈分别与发射线圈的线圈耦合关系的比值获得误差功率，误差功率与所述比值存在正相关的对照关系。
结合第二方面，在第三种可能的实现方式中，至少两个线圈包括接收线圈和第一辅助线圈时，利用所述至少两个线圈中任意两个线圈分别与发射线圈的线圈耦合关系的比值获得误差功率，具体包括：利用接收线圈的输出电压和所述第一辅助线圈的输出电压的比值获得误差功率。
结合第二方面，在第四种可能的实现方式中，至少两个线圈包括接收线圈和第一辅助线圈，所述电子设备还包括：与所述接收线圈连接的第一整流器，和与所述第一辅助线圈连接的第二整流器。利用所述至少两个线圈中任意两个线圈分别与发射线圈的线圈耦合关系的比值获得误差功率，具体包括：根据所述第一整流器的第一输出电压和所述第二整流器的第二输出电压的比值获得误差功率。
结合第二方面，在第五种可能的实现方式中，该方法还包括：根据预设阻抗和所述接收线圈的电流获得补偿电压，利用所述补偿电压对所述第一输出电压进行补偿，获得补偿后的电压与所述第二电压的比值。进而能够降低电子设备的阻抗对误差功率的影响，使得接收端控制器获取的补偿后的输出功率更加准确，进而使得发射端控制器获取的功率损耗能够更加准确。
结合第二方面，在第六种可能的实现方式中，至少两个线圈包括：接收线圈、第一辅助线圈和第二辅助线圈。利用所述至少两个线圈中任意两个线圈分别与发射线圈的线圈耦合关系的比值获得误差功率，具体包括：利用第一辅助线圈的输出电压和所述第二辅助线圈的输出电压的比值获得误差功率。
结合第二方面，在第七种可能的实现方式中，所述至少两个线圈包括：接收线圈、第一辅助线圈和第二辅助线圈，所述电子设备还包括：与所述接收线圈连接的第一整流器、与所述第一辅助线圈连接的第二整流器和与所述第二辅助线圈连接的第三整流器。利用所述至少两个线圈中任意两个线圈分别与发射线圈的线圈耦合关系的比值获得误差功率，具体包括：根据第二整流器的输出电压和所述第三整流器的输出电压的比值获得误差功率。此时，整流器的输出电压为直流电压，便于检测获取。
结合第二方面，在第八种可能的实现方式中，该方法还包括：根据比值获得所述发射线圈与所述接收线圈之间的水平位置偏移，所述比值与所述水平位置偏移正相关。
结合第二方面，在第九种可能的实现方式中，电子设备还包括：显示屏。该方法还包括：将所述水平位置偏移发送给所述显示屏进行显示，以提示此时需要对电子设备和无线充电器的相对位置进行校正。。
结合第二方面，在第十种可能的实现方式中，该方法还包括：获得所述电子设备和所述无线充电器的垂直距离，根据所述垂直距离获得对应的所述对照关系。
第三方面，本申请实施例还提供了一种无线充电系统，包括无线充电器和以上所述的电子设备。无线充电器包括：发射线圈。该发射线圈，用于向接收线圈发射电能为所述电子设备进行无线充电。
利用该无线充电系统，能够补偿因为电子设备的接收线圈和无线充电器的发射线 圈之间存在水平位置偏移而导致的功率损耗。此外，还能使得在进行金属异物检测时，不会将由于发射线圈与接收线圈之间的水平位置偏移导致认定为是由金属异物引起的损耗，避免了在发射线圈与接收线圈之间无金属异物但存在水平位置偏移时错误的判定发射线圈与接收线圈之间存在金属异物，因此还提升金属异物检测的准确度。
结合第三方面，在第一种可能的实现方式中，无线充电器包括：发射端控制器。发射端控制器根据输入功率和所述补偿后的输出功率获得功率损耗，当所述功率损耗大于预设功率阈值时，确定所述发射线圈和所述接收线圈之间存在金属异物。
结合第三方面，在第二种可能的实现方式中，无线充电器还包括信号灯。信号灯用于当发射端控制器确定发射线圈和所述接收线圈之间存在金属异物时，或在所述发射线圈和接收线圈之间存在水平位置偏移时进行提示。
第四方面，本申请实施例还提供了一种终端设备，包括：控制器、收发器和至少两个线圈；
所述至少两个线圈中包括一个接收线圈，和一个或者多个辅助线圈；
所述接收线圈，用于耦合无线充电器的发射线圈的电能为所述电子设备中的电池充电；
所述辅助线圈，用于补偿所述电子设备和所述无线充电器之间的水平位置偏移引起的功率损耗；
所述控制器，用于利用所述至少两个线圈中任意两个线圈分别与所述发射线圈的线圈耦合关系获得误差功率，将所述电子设备中给充电电路的输出功率和所述误差功率发送给所述收发器；
所述收发器，用于将所述输出功率和所述误差功率发送给所述无线充电器，以使所述无线充电器根据所述无线充电器的输入功率、所述电子设备中给充电电路的输出功率和所述误差功率获得功率损耗。
本申请提供的方案至少具有以下优点：
该电子设备包括至少两个线圈，其中一个为接收线圈，其余为辅助线圈。当无线充电器与电子设备之间存在水平位置偏移且无金属异物时，无线充电器与电子设备之间的功率损耗是由于水平位置偏移导致的。由于水平位置偏移的存在，会导致无线充电器发射能量的发射线圈与电子设备中接收能量的接收线圈的耦合关系发生变化，因此，在电子设备中增加辅助线圈，利用电子设备中两个不同线圈分别相对于发射线圈的线圈耦合关系来获得水平位置偏移引起的误差功率。例如当只包括一个辅助线圈时，可以利用接收线圈和辅助线圈分别与发射线圈的线圈耦合关系获得误差功率；当包括两个辅助线圈时，可以利用两个辅助线圈分别与发射线圈的线圈耦合关系获得误差功率。该误差功率表征由发射线圈和接收线圈之间的水平位置偏移引起的功率损耗。控制器根据输出功率和所述误差功率获得补偿后的输出功率，将所述补偿后的输出功率发送给收发器，再由收发器发送给无线充电器，以使无线充电器根据输入功率和所述补偿后的输出功率获得功率损耗。此时该功率损耗中由发射线圈和接收线圈之间的水平位置偏移引起的功率损耗已经被补偿。
综上所述，利用本申请提供的电子设备，能够补偿因为电子设备的接收线圈和无线充电器的发射线圈之间存在水平位置偏移而导致的功率损耗。此外，还能使得在进行金属异物检测时，不会将由于发射线圈与接收线圈之间的水平位置偏移导致认定为是由金属异物引起的损耗，避免了在发射线圈与接收线圈之间无金属异物但存在水平位置偏移时错误的判定发射线圈与接收线圈之间存在金属异物，因此还提升金属异物检测的准确度。
附图说明
图1为本申请提供的一种无线充电系统的示意图；
图2为图1中电子设备的结构的示意图；
图3为本申请提供的另一种无线充电系统的示意图；
图4为本申请实施例提供的一种电子设备对应的无线充电系统的示意图；
图5为表1对应的各部分损耗随水平位置偏移长度变化的分布示意图；
图6为本申请实施例提供的杂散损耗随水平位置偏移长度变化的曲线的示意图；
图7为本申请实施例提供的原理示意图一；
图8为本申请实施例提供的互感比值的曲线示意图；
图9为本申请实施例提供的互感比值与误差功率的曲线示意图；
图10为本申请实施例提供的另一种电子设备对应的无线充电系统的示意图；
图11为本申请实施例提供的一种电子设备的线圈的示意图；
图12A为本申请实施例提供的另一种电子设备的线圈的示意图；
图12B为本申请实施例提供的又一种电子设备的线圈的示意图；
图13为本申请实施例提供的提示出现水平位置偏移时的示意图；
图14为本申请实施例提供的又一种电子设备对应的无线充电系统的示意图；
图15为本申请实施例提供的再一种电子设备的线圈的示意图；
图16为本申请实施例提供的一种功率补偿方法的示意图；
图17为本申请实施例提供的一种无线充电系统的示意图。
具体实施方式
下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行描述，显然，所描述的实施例仅仅是本申请一部分实施例，而不是全部的实施例。
以下说明中的“第一”、“第二”等用词仅用于描述目的，而不能理解为指示或暗示相对重要性或者隐含指明所指示的技术特征的数量。由此，限定有“第一”、“第二”等的特征可以明示或者隐含地包括一个或者更多个该特征。在本申请的描述中，除非另有说明，“多个”的含义是两个或两个以上。
此外，本申请中，“上”、“下”等方位术语可以包括但不限于相对附图中的部件示意置放的方位来定义的，应当理解到，这些方向性术语可以是相对的概念，它们用于相对于的描述和澄清，其可以根据附图中部件附图所放置的方位的变化而相应地发生变化。
在本申请中，除非另有明确的规定和限定，术语“连接”应做广义理解，例如，“连接”可以是固定连接，也可以是可拆卸连接，或成一体；可以是直接相连，也可以通过中间媒 介间接相连。此外，术语“耦接”可以是实现信号传输的电性连接的方式。“耦接”可以是直接的电性连接，也可以通过中间媒介间接电性连接。
本申请实施例不具体限定电子设备的类型，电子设备可以为手机(mobile phone)、平板电脑(pad)、带无线收发功能的电脑、智能穿戴产品(例如，智能手表、智能手环、耳机等)、虚拟现实(virtual reality，VR)终端设备、增强现实(augmented reality AR)终端设备等具有无线设备。上述电子设备还可以是无线充电电动汽车、无线充电家用电器(例如豆浆机、扫地机器人)、无人机等电子产品。
以下为了方便说明，以电子设备为手机为例说明无线充电的实现原理。
参见图1，该图为本申请提供的一种无线充电系统的示意图。
无线充电器02用于为电子设备01(即手机)进行无线充电。图示的无线充电器02支撑电子设备01水平放置在上方，在一些实施例中，无线充电器02还可以具备其它形态，例如为立式无线充电器，具备一定的倾斜度，以使电子设备01可以倚靠贴紧无线充电器02。
该无线充电系统包括设置于电子设备01内的无线充电接收(receive，RX)装置20和与该无线充电接收装置20相耦接的电池50。
该无线充电系统还包括设置于无线充电器02内的无线充电发送(transmit，TX)装置30，以及与该无线充电发送装置30相耦接的适配器40，该适配器40用于提供充电电能。
无线充电发送装置30对无线充电接收装置20进行功率传输，同时无线充电发送装置30和无线充电接收装置20之间通过蓝牙(Bluetooth)、无线宽带(Wireless-Fidelity，WiFi)、紫蜂协议(Zigbee)、射频识别技术(Radio Frequency Identification，RFID)、远程(Long range，Lora)无线技术或近距离无线通信技术(Near Field Communication，NFC)实现无线连接，以使得无线充电发送装置30和无线充电接收装置20之间可以建立无线通信。
无线充电发送装置30和无线充电接收装置20之间可以传输控制信号或者传输充电数据。其中，该充电数据可以用于指示充电类型。在一些实施例中，该充电数据可以为充电协议，例如无线充电联盟(wireless power consortium，WPC)推出的无线充电标准Qi，例如BPP(basic power profile)协议，或者EPP(extended power profile)协议等。
参见图2，该图为图1中电子设备的结构的示意图。
以上述电子设备01为手机为例，其主要包括显示屏(display panel，DP)10。该显示屏10可以为液晶显示(liquid crystal display，LCD)屏，或者，有机发光二极管(organic light emitting diode，OLED)显示屏等，当手机采用折叠屏架构或多屏架构时，手机还可以包括多块屏幕，多块屏幕还可以是以上不同类型屏幕的组合，本申请对此不作限定。
上述电子设备01还可以包括中框11和壳体12。显示屏10和壳体12分别位于中框11的两侧，显示屏10的背面朝向壳体12，且该显示屏10和壳体12通过中框11相 连接。其中，中框11包括承载板110以及绕承载板110一周的边框111。电子设备01还可以包括印刷电路板(printed circuit boards，PCB)。
下面具体说明无线充电系统的工作原理。
参见图3，该图为本申请提供的另一种无线充电系统的示意图。
图3示出了无线充电系统的电路示意图。其中，无线充电器02包括供电电源30、发射端控制器301、逆变器302、发射端收发器306、匹配电容C1和发射线圈L1。
电子设备01包括接收线圈L2、匹配电容C2、整流器303、接收端控制器304、接收端收发器305、充电电路60和电池50。
供电电源30可以由图1中的适配器40实现。
逆变器302用于将供电电源30输出的直流电转换为交流电后输出，使得发射线圈L1产生高频交流电并发射交变磁场。接收线圈L2在接收到上述交变磁场后输出交流电，整流器303将所述交流电转换为直流电后输入充电电路60，充电电路60实现对电池50的充电。
电池50可以为一块电池，在一些实施例中，电子设备上还可以包括多块电池。
接收端收发器305和发射端收发器306之间可以传输控制信号或者传输充电数据。
接收端收发器305可以与接收端控制器304相耦接，接收端控制器304可以对发射端收发器306发送至接收端收发器305的充电协议进行识别，以判断出电子设备01的充电类型，例如该充电类型可以为第一充电类型(例如，适用于慢充的小功率充电)或者，上述充电类型可以为第二充电类型(例如，适用于快充的大功率充电)。
现有技术中，无线充电器02对电子设备01进行无线充电时，若接收线圈L2和发射线圈L1之间存在金属异物，会存在出现功率损耗(Ploss)，当功率损耗超过设定的门限值时，无线充电器02会中断功率传输。
然而，接收线圈L2和发射线圈L1之间可能出现水平位置偏移的情况，在此种情况下也会存在功率损耗。若水平位置偏移较大，功率损耗可能超过设定的门限值进而导致无线充电器中断功率传输。
为了解决以上技术问题，本申请实施例提供了一种电子设备，该电子设备包括至少两个线圈，其中一个为接收线圈，其余为辅助线圈，添加辅助线圈是为了补偿因为电子设备和无线充电器之间存在水平位置偏移而导致的功率损耗。
为了使本领域技术人员更清楚的理解本申请的技术方案，下面结合附图对本申请的技术方案进行说明。
实施例一：
参见图4，该图为本申请实施例提供的一种电子设备对应的无线充电系统的示意图。
其中，该电子设备包括控制器(图中为接收端控制器304)和至少两个线圈。
至少两个线圈中包括一个接收线圈L2，其余为辅助线圈，图4中以电子设备包括一个辅助线圈，即第一辅助线圈L3为例进行说明。
在一些实施例中，该电子设备也可以包括多个辅助线圈，后续实施例将详细介绍。
接收线圈L2用于耦合发射线圈L1的电能为电子设备中的电池50充电。
下面首先说明该控制器实现功率损耗补偿的原理。
继续参见图4所示的无线充电系统，现在仅考虑发射线圈L1与接收线圈L2之间的水平位置偏移对功率损耗的影响，即发射线圈L1与接收线圈L2之间无金属异物，发射线圈L1与接收线圈L2之间的功率损耗是由于发射线圈L1与接收线圈L2之间的水平位置偏移导致。
实际测量得到的功率损耗随发射线圈L1与接收线圈L2之间的水平位置偏移长度变化的趋势如下表。
表一：功率损耗随水平位置偏移长度变化的测量表
Figure PCTCN2021078803-appb-000001
其中，表一第一列是水平位置偏移长度，单位为毫米mm，综合分析表一，可以发现除第五列的杂散损耗外，其余类型的损耗，随水平位置偏移长度变化的幅度较小。而杂散损耗随水平位置偏移长度的增大而明显增加，即杂散损耗与水平位置偏移存在正相关的关系。
参见图5，该图为表一对应的各部分损耗随水平位置偏移长度变化的分布示意图。
由该功率损耗分布图可较为直观的发现，当发射线圈L1与接收线圈L2之间的水平位置偏移长度增加时，杂散损耗增加的非常明显。杂散损耗包括导体的涡流损耗、磁屏蔽材料的损耗以及其它原因引起的损耗之和。
因此当无线充电器的发射线圈L1与电子设备的接收线圈L2之间存在水平位置偏移且无金属异物时，会产生较为明显的杂散损耗，即导致功率损耗增大。
而金属异物检测的准确性取决于功率损耗(Ploss)的计算精度，当发射线圈L1与接收线圈L2之间无金属异物但存在水平位置偏移时，由于水平位置偏移引入的杂散损耗导致功率损耗增大，因此可能错误的判定发射线圈与接收线圈之间存在金属异物，进而影响了金属异物检测的准确性。
因此准确补偿因为发射线圈L1与接收线圈L2之间水平位置偏移带来的杂散损耗成为提高功率损耗(Ploss)计算精度的关键。
参见图6，该图为本申请实施例提供的杂散损耗随水平位置偏移长度变化的曲线的示意图。
参考该曲线示意图，对应于表一的杂散损耗一列的数据，实现对杂散损耗补偿的关键在于根据水平位置偏移长度信息，通过曲线拟合，补偿因为水平位置偏移导致的杂散损耗(金属异物导致的损耗不能补偿)，进而提升无线充电情况下基于功率损耗判断金属异物的精度。下面具体说明进行曲线拟合的原理与实现方式。
本申请实施例通过在电子设备上增加设置辅助线圈，进而利用电子设备的任意两个线圈分别与发射线圈的线圈耦合关系获取因为水平位置偏移而导致的功率损失。
其中，该线圈耦合关系包括以下任意一种：线圈互感、线圈耦合系数或电子设备中的线圈从发射线圈耦合的电压大小，所述线圈互感与所述电子设备中线圈的输出电压成正比；所述线圈耦合系数与所述电子设备中线圈的输出电压成正比。
在一些实施例中，可以具体利用电子设备的至少两个线圈中任意两个线圈分别与发射线圈的线圈耦合关系的比值获得误差功率，所述误差功率为所述电子设备和所述无线充电器之间的水平位置偏移引起的功率损耗，所述误差功率与所述比值存在正相关的对照关系。
下面首先以线圈耦合关系为线圈互感为例说明本申请采用接收线圈和辅助线圈获取误差功率的原理。
参见图7，该图为本申请实施例提供的原理示意图一。
对应于图4所示的无线充电系统，无线充电系统中包括至少三个线圈：发射线圈L1、接收线圈L2和至少一个辅助线圈L3。下面首先以辅助线圈的数量为1为例进行说明。
接收线圈L2对发射线圈L1的互感为M12，辅助线圈L3对发射线圈L1的互感为M13。
其中，激励电压U1为发射线圈L1两端的电压，U2为接收线圈L2的感应电压，U3为辅助线圈L3的感应电压，I1为辅助线圈L3和接收线圈L2的感应电流。
由于接收线圈L2的感应电压U2∝M12×I1，辅助线圈L3的感应电压U3∝M13×I1，即感应电压与互感成正比，互感大小决定线圈的感应电压大小，因此也可以用电压的比值来表征互感的比值。
当发射线圈L1与接收线圈L2存在水平位置偏移(图7中以圆心偏移量表征该水平位置偏移)时，接收线圈L2与辅助线圈L3的相对位置固定，此时发射线圈L1与辅助线圈L3也相应存在水平位置偏移。
当电子设备的接收线圈L2和辅助线圈L3设置在同一个平面内时，图7中的垂直距离指发射线圈L1所在平面与接收线圈L2所在平面之间的距离，以下将该垂直距离称为Z向距离。
对于一个包括电子设备和无线充电器的无线充电系统，Z向距离可能发生变化， 例如当电子设备上套有不同类型的保护壳时，可能会改变发射线圈L1所在平面与接收线圈L2所在平面之间的Z向距离。
参见图8，该图为本申请实施例提供的互感比值的曲线示意图。
该图示出了同一电子设备当Z向距离(分别以4mm、5mm和6mm为例)不同时，互感M13与M12的比值与水平位置偏移长度之间的关系曲线。可以发现，当Z向距离固定时，随着发射线圈L1与接收线圈L2之间的水平位置偏移长度的增加，互感M13与M12的比值相应增加，两者具有正相关的关系。
当水平位置偏移长度固定不变时，随着Z向距离的增加，互感M13与M12的比值也相应增加。以上情况可以对应于实际应用中电子设备上安装有保护套(保护壳)的场景，即保护壳越厚，对应的Z向距离的增加，导致互感M13与M12的比值也相应增加。
参见图9，该图为本申请实施例提供的互感比值与误差功率的曲线示意图。
图9以Z向长度(即发射线圈L1与接收线圈L2所在平面的距离)为6mm、圆心偏移量(即水平位置偏移长度)为0-10mm为例，示出了M13与M12的比值与杂散损耗之间的关系曲线。
对图9所示的曲线进行拟合，得到的拟合方程为：y＝-1.0884x 2+9.8417x-17.615。其中，x为M13与M12的比值，y为杂散损耗。
按照该方程所示关系得出误差功率对表一中所示的杂散损耗进行补偿，得到补偿后的杂散损耗如下表所示。
表二：补偿后的杂散损耗的误差表
Figure PCTCN2021078803-appb-000002
由表三所示的补偿后的误差数据可以发现，补偿后的由接收线圈和无线充电器的发射线圈之间存在水平位置偏移而导致的功率损耗显著降低。
进一步的，参见下表所示的无线充电标准Qi定义的BPP(Basic Power Profile)协议和EPP(Extended Power Profile)协议对应的功率损耗(Ploss)阈值。其中，BPP协议中电子设备中给充电电路的输出功率为5W，EPP协议中电子设备中给充电电路的输出功率可达15W。
表三：功率损耗(Ploss)阈值与输出功率的对应关系
输出功率大小 Ploss阈值
5W 350mW
10W 500mW
15W 750mW
… …
xxW xxxmW
   
当功率损耗达到Ploss阈值时，无线充电器会中断功率传输。而由表二中的数据可知，通过拟合方程补偿杂散损耗后，由于水平位置偏移引入无线充电系统的杂散损耗变得非常小，不超过150mW，小于BPP协议下无线充电器会中断功率传输的功率损耗阈值350mW，并且小于EPP协议下无线充电器会中断功率传输的功率损耗阈值350mW-750mW。因此不会导致无线充电器在无金属异物时由于电子设备的接收线圈和无线充电器的发射线圈之间存在水平位置偏移而中断功率传输，即当通过检测功率损耗(Ploss)实现金属异物检测时，功率损耗中由发射线圈和接收线圈之间的水平位置偏移引起的损耗已经被补偿，进而能够更加准确的进行金属异物的检测。
可以理解的是，以上述得到的拟合方程为二次方程为例进行说明，在一些实施例中，拟合方程还可以一次方程或其它形式的方程，具体取决于采用拟合算法，本申请实施例在此不再赘述。
在一些实施例中，也可以利用接收线圈和发射线圈的输出电压的比值获取对应的误差功率，即获得的是M12与M13的比值，该实现方式原理与以上说明相同，本申请实施例在此不再赘述。
其中，本申请实施例中的控制器可以为电子设备上的主处理器，也可以为电子设备上的其它处理器。例如，当电子设备为手机时，控制器可以为手机的主处理器，即CPU，还可以为其它处理器，例如可以为其它具有运算控制功能的芯片。
以上实施例中，对于电子设备，其不同Z向距离下线圈的互感比值和水平位置偏移长度的对应关系可以预先测量确定后存储在电子设备上，例如可以存储在电子设备的存储器上。
进一步的，每个Z向距离取值下的线圈的互感比值的拟合方程也可以预先确定并存储在电子设备上。
此时，当电子设备放置在无线充电器上进行无线充电时，电子设备的控制器可以获取和无线充电器之间的Z向距离，以及利用线圈的输出电压获取线圈对应的互感的比值，并调用当前的Z向距离对应的线圈的互感比值和水平位置偏移长度的对应关系，以及当前的Z向距离对应的拟合方程。
电子设备的控制器进一步根据该线圈的互感比值和水平位置偏移长度的对应关系，获取当前互感的比值对应的水平位置偏移长度，并根据拟合方程获取当前的互感的比值对应的杂散损耗，即获得了电子设备的接收线圈和无线充电器的发射线圈之间存在水平位置偏移而导致的功率损耗。
继续参见图4的无线充电系统，基于以上说明的原理，下面说明本申请实施例提供的电子设备的工作原理。
接收端控制器304利用接收线圈L2的输出电压V1和第一辅助线圈L3的输出电压V2获得误差功率，用△P表示。
具体的，控制器可以利用接收线圈L2的输出电压V1和第一辅助线圈L3的输出电压V2的比值获取对应接收线圈L2和第一辅助线圈L3的互感的比值。
接收端控制器304由输出功率Pout和误差功率△P获得补偿后的输出功率Prx。其中，Prx＝Pout+△P。
接收端控制器304将补偿后的输出功率Prx发送给接收端的收发器，再由接收端的收发器发送给无线充电器，以使无线充电器能够根据输入功率Pin和补偿后的输出功率Prx获得功率损耗Ploss。其中，Ploss＝Pin-Prx。
需要说明的是，无线充电器连接电源，例如连接市电，无线充电器的输入功率Pin可以由无线充电器的输入电压和输入电流来获得。电子设备中的输出功率Pout是指输出给充电电路的功率，可以利用接收线圈对应的整流器的输出电压和输入电流来获得Pout，如图4所示，可以通过第一整流器303a的输出电压和输出电流获得输出功率Pout。
当然，在一些实施例中，也可以利用接收端的线圈的耦合系数的比值获得误差功率。由于线圈耦合系数与电子设备中线圈的输出电压成正比，此时依然可以利用接收端的任意两个线圈的输出电压的比值表征该任意两个线圈分别与发射线圈的线圈耦合关系，进而获得误差功率，本申请实施例在此不再赘述。
在一些实施例中，辅助线圈的作用可以通过以下方式确定：当电子设备的其它条件均固定不变时，直接测量电子设备包括辅助线圈时，电子设备给无线充电器的反馈功率，再测量电子设备不包括辅助线圈时，电子设备给无线充电器的反馈功率，比较两次测量得到的两个反馈功率的区别，即可以确定辅助线圈的作用为补偿误差功率。
综上所述，当该电子设备只包括一个辅助线圈时，可以利用接收线圈和辅助线圈分别与发射线圈的线圈耦合关系获得误差功率；当包括两个辅助线圈时，可以利用两个辅助线圈分别与发射线圈的线圈耦合关系获得误差功率，该误差功率表征由发射线圈和接收线圈之间的水平位置偏移引起的功率损耗，误差功率与该比值正相关。控制器由输出功率和所述误差功率获得补偿后的输出功率，将所述补偿后的输出功率发送给无线充电器，以使无线充电器根据输入功率和所述补偿后的输出功率获得功率损耗，此时该功率损耗中由发射线圈和接收线圈之间的水平位置偏移引起的功率损耗已经被补偿。
综上所述，利用本申请实施例提供的电子设备，能够补偿因为电子设备的接收线圈和无线充电器的发射线圈之间存在水平位置偏移而导致的功率损耗，并且辅助线圈主要检测的是励磁磁通，即发射线圈提供的磁通，对金属异物引起的磁通变化不敏感，因此不会补偿金属异物导致的功率损耗，使得在进行金属异物检测时，不会将由于发射线圈与接收线圈之间的水平位置偏移导致认定为是由金属异物引起的损耗，避免了在发射线圈与接收线圈之间无金属异物但存在水平位置偏移时错误的判定发射线圈与 接收线圈之间存在金属异物，因此还提升金属异物检测的准确度。
实施例二：
下面结合具体实现方式说明该电子设备包括接收线圈和第一辅助线圈时的工作原理。
参见图10，该图为本申请实施例提供的另一种电子设备对应的无线充电系统的示意图。
该电子设备包括接收线圈L2和第一辅助线圈L3，还包括与接收线圈L2连接的第一整流器303a，和与第一辅助线圈L3连接的第二整流器303b。
在一种可能的实现方式中，控制器能够利用接收线圈L2的输出电压和第一辅助线圈L3的输出电压的比值获得误差功率。线圈的输出电压为交流电压，控制器可以根据两个线圈的输出电压的峰值的比值或者两个线圈的输出电压的有效值的比值获取对应的误差功率，本申请实施例对此不作具体限定。
在另一种可能的实现方式中，可以利用两个线圈对应的直流输出电压的比值，例如控制器用于根据第一整流器303a的第一输出电压V1和第二整流器303b的第二输出电压V2的比值获得误差功率。
进一步的，对于以上的第二种实现方式，当利用接收线圈L2与第一辅助线圈L1对应的整流器的输出电压的比值获得误差功率时，由于接收线圈输出的电流需要给电池进行充电，负载电流流经电子设备的接收线圈L2、电容C2和第一整流器303a等时会产生压降，进而影响获得的第一整流器303a的第一输出电压V1的准确性，因此为了补偿负载电流对电压产生的误差，可以将电子设备的接收线圈L2、电容C2和第一整流器303a等的等效电阻用Requ表示，电子设备的输出电流为Iout，则接收端控制器304还可以通过Requ和Iout对第一整流器303a的第一输出电压V1进行补偿，通过以下公式获取补偿后的输出电压V1’：
V1’＝V1+Requ×Iout      (1)
式(1)中的Requ为预设阻抗,可以预先确定并保存在电子设备中，Iout可以实时检测。
接收端控制器304根据预设阻抗Requ和第一整流器303a的输出电流对第一输出电压V1进行补偿，然后获得补偿后的电压V1’与第二电压V2的比值，根据该比值获取对应的误差功率△P，并由输出功率Pout和所述误差功率△P获得补偿后的输出功率Prx。其中，Prx＝Pout+△P。然后接收端控制器304将补偿后的输出功率Prx发送给无线充电器。
由于在电子设备端对第一整流器303a的第一输出电压V1进行补偿，进而能够降低电子设备的阻抗对误差功率△P的影响，使得接收端控制器304获取的补偿后的输出功率Prx更加准确，进而使得发射端控制器获取的功率损耗能够更加准确，因此进一步提升金属异物检测的精度。
参见图11，该图为本申请实施例提供的一种电子设备的线圈的示意图。
对应于图10所示的电子设备，接收线圈L2可以设置于第一辅助线圈L3的径向内围。在此情况下，接收线圈L2的第一端②和第二端③，位于第一辅助线圈L3的第一端①和第二端④之间。
第一辅助线圈L3可以为一匝线圈或多匝线圈。当第一辅助线圈L3为多匝线圈时，所述多匝的端头并联在一起或串联在一起。
进一步的，在一些实施例中，接收线圈L2和第一辅助线圈L3位于同一个平面，因此不会增加电子设备的线圈模组的厚度，进而便于电子设备实现轻薄化。
在一些实施例中，接收线圈L2的中心和第一辅助线圈L3的中心重合。即当接收线圈L2和第一辅助线圈L3为圆环形绕组时，接收线圈L2和第一辅助线圈L3设置时圆心重合。当接收线圈L2和第一辅助线圈L3中存在其它非圆环形的线圈，例如存在方形线圈时，接收线圈L2和第一辅助线圈L3设置时几何中心点重合放置。
参见图12A，该图为本申请实施例提供的另一种电子设备的线圈的示意图。
在本申请的另一些实施例中，第一辅助线圈L3设置于接收线圈L2的径向内围。该接收线圈L2的第一端②和第二端③，位于第一辅助线圈L3的第一端①和第二端④之间。
参见图12B，该图为本申请实施例提供的又一种电子设备的线圈的示意图。
在本申请的又一些实施例中，第一辅助线圈L3的一部分设置于接收线圈L2的径向内围，另一部分设置于接收线圈L2的径向外围。该接收线圈L2的第一端②和第二端③，位于第一辅助线圈L3的第一端①和第二端④之间。
进一步的，在一些实施例中，控制器还能够根据获取的比值获得发射线圈L1与接收线圈L2之间的水平位置偏移，即获取水平位置偏移长度。具体的，接收端控制器304可以由拟合方程确定此时的误差功率，再由预先确定的误差功率与水平偏移(水平位置偏移长度的对应关系)的对应关系获得水平偏移。在一些实施例中，可以将预先确定的误差功率与水平偏移的对应关系以数据表的形式存储在电子设备中，然后通过查表的方式确定与当前的误差功率对应的水平偏移。
参见图13，该图为本申请实施例提供的提示出现水平位置偏移时的示意图。
电子设备01还可以包括显示屏，关于显示屏的说明可以参见图2中关于显示屏10的说明，本申请实施例在此不再赘述。控制器还能够将所述水平位置偏移发送给所述显示屏进行显示，以提示此时需要对电子设备和无线充电器的相对位置进行校正。此外，在一些实施例中，控制器控制显示屏显示所述水平位置偏移时，还可以进一步控制电子设备通过震动、语音、铃声等方式进行提示。
无线充电器02上还可以具备具有提示功能的信号灯，信号灯用于在出现水平位置偏移时进行提示，例如可以在出现水平位置偏移时进行闪烁或者切换为预设颜色以进行提示。信号灯还可以用于在无线充电器的控制器(即发射端控制器)确定发射线圈和接收线圈之间存在金属异物时进行提示。
综上所述，本申请实施例提供的电子设备的控制器能够根据接收线圈和第一辅助线圈的输出电压的比值获得误差功率，或，根据第一整流器的第一输出电压和所述第 二整流器的第二输出电压的比值获得误差功率，该误差功率表征由发射线圈和接收线圈之间的水平位置偏移引起的功率损耗，误差功率与该比值正相关。控制器由输出功率和所述误差功率获得补偿后的输出功率，将所述补偿后的输出功率发送给无线充电器，以使无线充电器根据输入功率和所述补偿后的输出功率获得功率损耗，由于该功率损耗中由发射线圈和接收线圈之间的水平位置偏移引起的功率损耗已经被补偿，因此应用该功率损耗进行金属异物检测时的精确度更高。
此外，当控制器根据第一整流器的第一输出电压和所述第二整流器的第二输出电压的比值获得误差功率时，还能够利用预设阻抗和第一整流器的输出电流对第一电压进行补偿，进而能够降低电子设备的阻抗对误差功率的影响，使得接收端控制器获取的补偿后的输出功率更加准确，进而使得发射端控制器获取的功率损耗能够更加准确，因此进一步提升金属异物检测的精度。
实施例三：
以上介绍的是电子设备包括一个接收线圈，一个辅助线圈为例进行介绍，比值为接收线圈和辅助线圈对应的电压的比值，下面说明该电子设备包括两个辅助线圈，利用两个辅助线圈对应的电压获得比值来进行误差功率补偿。
参见图14，该图为本申请实施例提供的又一种电子设备对应的无线充电系统的示意图。
电子设备包括接收线圈L2、第一辅助线圈L3和第二辅助线圈L4。控制器还包括与接收线圈L2连接的第一整流器303a、与第一辅助线圈L3连接的第二整流器303b和与第二辅助线圈L4连接的第三整流器303c。
在一种可能的实现方式中，接收端控制器304用于利用第一辅助线圈L3的输出电压和第二辅助线圈L4的输出电压的比值获得误差功率。线圈的输出电压为交流电压，控制器可以根据两个线圈的输出电压的峰值的比值或者两个线圈的输出电压的有效值的比值获取对应的误差功率，本申请实施例对此不作具体限定。
在另一种可能的实现方式中，控制器用于根据第二整流器303b的输出电压V2和第三整流器303c的输出电压V3的比值获得误差功率△P，并由输出功率Pout和所述误差功率△P获得补偿后的输出功率Prx。其中，Prx＝Pout+△P。
然后接收端控制器304将补偿后的输出功率Prx发送给无线充电器，以使无线充电器根据输入功率Pin和补偿后的输出功率Prx获得功率损耗Ploss。其中Ploss＝Pin-Prx。
参见图15，该图为本申请实施例提供的再一种电子设备的线圈的示意图。
在一些实施例中，第一辅助线圈L3和第二辅助线圈L4分别位于接收线圈L2的径向内围和径向外围。在此情况下，第二辅助线圈L4的第一端①和第二端④在最外围，接收线圈L2的第一端②在第二辅助线圈L4的第一端①和第一辅助线圈L3的第一端⑤之间，接收线圈L2的第二端③在第二辅助线圈L4的第二端④和第一辅助线圈L3的第二端⑥之间。
此外，在另一些实施例中，第一辅助线圈L3和第二辅助线圈L4还可以均位于接 收线圈L2的径向内围；第一辅助线圈L3和第二辅助线圈L4还可以均位于接收线圈L2的径向外围。本申请实施例再次不再一一赘述。
在一些实施例中，接收线圈L2、第一辅助线圈L3和第二辅助线圈L4位于同一个平面，因此不会增加电子设备的线圈模组的厚度，进而便于电子设备实现轻薄化。
在一些实施例中，接收线圈L2的中心、第一辅助线圈L3的中心和第二辅助线圈L4的中心重合。即当接收线圈L2、第一辅助线圈L3和第二辅助线圈L4为圆环形绕组时，接收线圈L2、第一辅助线圈L3和第二辅助线圈L4设置时圆心重合。当接收线圈L2、第一辅助线圈L3和第二辅助线圈L4中存在其它非圆环形的线圈，例如存在方形线圈时，接收线圈L2、第一辅助线圈L3和第二辅助线圈L4的几何中心点重合。
在一些实施例中，第一辅助线圈L3和第二辅助线圈L4可以为一匝或多匝，当为多匝时，所述多匝线圈的端头并联在一起或串联在一起。第一辅助线圈L3和第二辅助线圈L4的线圈匝数可以相同，也可以不同，本申请实施例不作具体限定。以图15所示的线圈示意图为例，辅助线圈的端头位置即图中标号①④⑤⑥的位置，当多匝线圈的端头串联时，标号⑥对应的一端可以与标号①对应的一端串联。当多匝线圈的端头并联时，标号⑥对应的一端可以与标号③对应的一端连接，标号⑤对应的一端可以与标号①对应的一端连接，以实现内外侧线圈的并联。
进一步的，在一些实施例中，控制器还能够根据获取的比值确定发射线圈L1与接收线圈L2之间的水平位置偏移，即获取水平位置偏移长度。具体的，接收端控制器304可以由拟合方程确定此时的误差功率，再由预先确定的误差功率与水平偏移(水平位置偏移长度的对应关系)的对应关系确定水平偏移。在一些实施例中，可以将预先确定的误差功率与水平偏移的对应关系以数据表的形式存储在电子设备中，然后通过查表的方式确定与当前的误差功率对饮的水平偏移。
电子设备还可以包括显示屏，控制器还能够将所述水平位置偏移发送给所述显示屏进行显示，以提示此时需要对电子设备和无线充电器的相对位置进行校正。此外，在一些实施例中，控制器控制显示屏显示所述水平位置偏移时，还可以进一步控制电子设备通过震动、语音、铃声等方式进行提示。
综上所述，本申请实施例提供的电子设备的控制器能够根据第一辅助线圈和第二辅助线圈的输出电压的比值获得误差功率，或，根据第二整流器的输出电压和所述第三整流器的输出电压的比值获得误差功率，该误差功率表征由发射线圈和接收线圈之间的水平位置偏移引起的功率损耗，误差功率与该比值正相关。控制器由输出功率和所述误差功率获得补偿后的输出功率，将所述补偿后的输出功率发送给无线充电器，以使无线充电器根据输入功率和补偿后的输出功率获得功率损耗，由于该功率损耗中由发射线圈和接收线圈之间的水平位置偏移引起的功率损耗已经被补偿，因此应用该功率损耗进行金属异物检测时的精确度更高。
此外，当控制器根据第二整流器的输出电压和所述第三整流器的输出电压的比值获得误差功率时，由于第一辅助线圈和第二辅助线圈并不用于为电池50进行充电，即第二整流器的输出电压和第三整流器的输出电压不受负载电流引起的压降的影响，因 此不需要对整流器的输出电压进行补偿。
方法实施例：
基于以上实施例提供的电子设备，本申请实施例还提供了一种功率补偿方法，应用于无线充电的电子设备，下面结合附图具体说明。
参见图16，该图为本申请实施例提供的一种功率补偿方法的示意图。
该方法应用于无线充电的电子设备，该电子设备包括控制器、至少两个线圈和收发器，所述至少两个线圈中包括一个接收线圈，其余为辅助线圈。
其中，接收线圈用于耦合发射线圈的电能为电子设备中的电池充电。
辅助线圈用于补偿电子设备和无线充电器之间的水平位置偏移引起的功率损耗。
关于电子设备的具体说明可以参见以上实施例，本申请实施例在此不再赘述。
本方法的原理是利用电子设备的至少两个线圈中任意两个线圈分别与所述发射线圈的线圈耦合关系获得误差功率，其中，所述线圈耦合关系包括以下任意一种：线圈互感、线圈耦合系数或所述电子设备中的线圈从所述发射线圈耦合的电压大小；所述线圈互感与所述电子设备中线圈的输出电压成正比；所述线圈耦合系数与所述电子设备中线圈的输出电压成正比。
在一些实施例中，可以利用所述至少两个线圈中任意两个线圈分别与所述发射线圈的线圈耦合关系的比值获得误差功率，所述误差功率与所述比值存在正相关的对照关系。
下面以线圈耦合关系为线圈互感为例进行说明，当线圈耦合关系为其它两种关系时的原理类似，本申请实施例在此不再赘述。
电子设备可以包括存储器，以及一个或多个计算机程序，其中所述一个或多个计算机程序被存储在所述存储器中，所述一个或多个计算机程序包括指令，当所述指令被所述电子设备执行时，使得所述电子设备执行以下步骤：
S1601：电子设备置于无线充电器上开始进行无线充电。
S1602：电子设备的控制器获取发射线圈所在平面与接收线圈所在平面之间的垂直距离。
该垂直距离即以上实施例中所述的Z向距离。
S1603：电子设备的控制器获取该垂直距离对应的线圈的互感比值和水平位置偏移长度的对应关系，并获取该垂直距离对应的互感比值的拟合方程。
在一些实施例中，不同垂直距离下线圈的互感比值和水平位置偏移长度的对应关系可以预先测量确定后存储在电子设备上，例如可以存储在电子设备的存储器上。
进一步的，每个垂直距离下的线圈的互感比值的拟合方程也可以预先确定并存储在电子设备上，例如可以存储在电子设备的存储器上。
S1604：电子设备的控制器利用至少两个线圈中任意两个线圈的输出电压获取线圈对应的互感比值。
具体的，控制器利用至少两个线圈中任意两个线圈的输出电压的比值获得误差功 率。
下面首先说明电子设备包括接收线圈和第一辅助线圈时该方法的原理。
继续参见图10，此时S1604具体为利用接收线圈的输出电压和第一辅助线圈的输出电压的比值获得误差功率。
线圈的输出电压为交流电压，在一些实施例中可以根据两个线圈的输出电压的峰值的比值或者两个线圈的输出电压的有效值的比值获取对应的误差功率，本申请实施例对此不作具体限定。
进一步的，电子设备还包括与接收线圈连接的第一整流器，和与第一辅助线圈连接的第二整流器。
此时S1604具体为根据第一整流器的第一输出电压和第二整流器的第二输出电压的比值获得误差功率。
在一些实施例中，由于接收线圈输出的电流需要给电池进行充电，负载电流流经电子设备的接收线圈L2、电容C2和第一整流器等时会产生压降，进而影响获得的第一整流器的第一输出电压的准确性，因此为了补偿负载电流对电压产生的误差，将电子设备的接收线圈L2、电容C2和第一整流器等的等效电阻用Requ表示，电子设备的输出电流为Iout，则还可以通过Requ和Iout对第一整流器的第一输出电压V1进行补偿，得到补偿后的输出电压V1’。
其中，V1’＝V1+Requ×Iout。
然后获得补偿后的电压V1’与第二电压V2的比值。
下面说明电子设备包括接收线圈、第一辅助线圈和第二接收线圈时该方法的原理。
继续参见图14，此时S1604具体为利用第一辅助线圈的输出电压和第二辅助线圈的输出电压的比值获得误差功率。
线圈的输出电压为交流电压，在一些实施例中，可以根据两个线圈的输出电压的峰值的比值或者两个线圈的输出电压的有效值的比值获取对应的误差功率，本申请实施例对此不作具体限定。
进一步的，电子设备还包括与接收线圈连接的第一整流器、与第一辅助线圈连接的第二整流器和与第二辅助线圈连接的第三整流器。
此时，此时S1604具体为根据第二整流器的输出电压和第三整流器的输出电压的比值获得误差功率。
S1605：电子设备的控制器利用该互感比值，根据S1603获取的互感比值的拟合方程，确定获得误差功率。
S1606：电子设备的控制器利用该互感比值，根据S1603获取的互感比值和水平位置偏移长度的对应关系，确定当前电子设备和无线充电器之间的水平位置偏移长度。
S1607：电子设备的控制器将水平位置偏移发送给显示屏进行显示。
继续参见图13，当电子设备01包括显示屏时，还能够将所述水平位置偏移发送给显示屏进行显示，以提示此时需要对电子设备和无线充电器的相对位置进行校正。此外，在一些实施例中，控制器控制显示屏显示所述水平位置偏移时，还可以进一步控 制电子设备通过震动、语音、铃声等方式进行提示。
无线充电器02上的信号灯用于在出现水平位置偏移时进行提示。信号灯还可以用于在无线充电器的控制器(即发射端控制器)确定发射线圈和接收线圈之间存在金属异物时进行提示。
S1608：电子设备的控制器由输出功率和所述误差功率获得补偿后的输出功率，将所述补偿后的输出功率发送给所述收发器。
误差功率用△P表示，输出功率用Pout表示，则补偿后的输出功率Prx＝Pout+△P。
S1609：电子设备的收发器将补偿后的输出功率Prx发送给无线充电器，以使无线充电器根据输入功率和补偿后的输出功率获得功率损耗。
其中输入功率用Pin表示，功率损耗Ploss＝Pin-Prx。
可以理解的是，以上的步骤划分与顺序仅是为了方便说明，并不构成对于本申请所述方法的限定，以上的步骤在一些实施例中可以还可以进行适当的调整与调换。
综上所述，本申请实施例提供的方法利用电子设备的任意两个线圈分别与所述发射线圈的线圈耦合关系获得误差功率，即当只包括一个辅助线圈时，可以利用接收线圈和辅助线圈分别与所述发射线圈的线圈耦合关系获得误差功率；当包括两个辅助线圈时，可以利用两个辅助线圈分别与所述发射线圈的线圈耦合关系获得误差功率，该误差功率表征由发射线圈和接收线圈之间的水平位置偏移引起的功率损耗，误差功率与该比值正相关。由输出功率和所述误差功率获得补偿后的输出功率，将所述补偿后的输出功率发送给收发器，再由收发器发送给无线充电器，以使无线充电器根据输入功率和所述补偿后的输出功率获得功率损耗。此时该功率损耗中由发射线圈和接收线圈之间的水平位置偏移引起的功率损耗已经被补偿。因此使得在进行金属异物检测时，不会将由于发射线圈与接收线圈之间的水平位置偏移导致认定为是由金属异物引起的损耗，避免了在发射线圈与接收线圈之间无金属异物但存在水平位置偏移时错误的判定发射线圈与接收线圈之间存在金属异物，因此还提升金属异物检测的准确度。
系统实施例：
基于以上实施例提供的电子设备，本申请实施例还提供了一种无线充电系统，下面结合附图具体说明。
参见图17，该图为本申请实施例提供的一种无线充电系统的示意图。
其中，该无线充电系统03包括无线充电器02和电子设备01。
该无线充电器02包括供电电源、发射端控制器、逆变器、发射端收发器、匹配电容和发射线圈。
电子设备01包括接收线圈、至少一个辅助线圈、匹配电容、整流器、接收端控制器、接收端收发器、充电电路和电池。
供电电源可以由图1中的适配器实现。逆变器用于将供电电源输出的直流电转换为交流电后输出，使得发射线圈产生高频交流电并发射交变磁场。接收线圈在接收到上述交变磁场后输出交流电，整流器将所述交流电转换为直流电后输入充电电路，充 电电路实现对电池的充电。
电子设备还包括存储器，以及一个或多个计算机程序，其中所述一个或多个计算机程序被存储在所述存储器中，所述一个或多个计算机程序包括指令，当所述指令被所述电子设备执行时，使得所述电子设备执行以上方法实施例中记载的步骤。
接收端的控制器利用接收端的至少两个线圈中任意两个线圈分别与所述发射线圈的线圈耦合关系获得误差功率，该线圈耦合关系包括以下任意一种：线圈互感、线圈耦合系数或所述电子设备中的线圈从所述发射线圈耦合的电压大小；所述线圈互感与所述电子设备中线圈的输出电压成正比；所述线圈耦合系数与所述电子设备中线圈的输出电压成正比。
具体的，控制器利用至少两个线圈中任意两个线圈分别与发射线圈的线圈耦合关系的比值获得误差功率，所述误差功率与所述比值存在正相关的对照关系。
下面以线圈耦合关系为线圈互感为例进行说明，当线圈耦合关系为其它两种关系时的原理类似，本申请实施例在此不再赘述。
由输出功率和误差功率获得补偿后的输出功率，将补偿后的输出功率发送给接收端的收发器。接收端的收发器将补偿后的输出功率发送给无线充电器的收发器，以使无线充电器02的控制器根据输入功率Pin和补偿后的输出功率Prx获得功率损耗Ploss，当功率损耗大于预设功率阈值时，确定发射线圈L1和接收线圈L2之间存在金属异物。其中，Ploss＝Pin-Prx。
在一些实施例中，预设功率阈值的取值与输出功率的大小有关，例如可以参见以上说明中的表三，不同的输出功率对应不同的Ploss阈值(即预设功率阈值)。
关于电子设备的控制器的工作原理可以参见以上实施例中的相关说明，本申请实施例在此不再赘述。
电子设备01具体可以为手机(mobile phone)、平板电脑(pad)、带无线收发功能的电脑、智能穿戴产品(例如，智能手表、智能手环、耳机等)、虚拟现实(virtual reality，VR)终端设备、增强现实(augmented reality AR)终端设备等具有无线设备。上述电子设备还可以是无线充电电动汽车、无线充电家用电器(例如豆浆机、扫地机器人)、无人机等电子产品。
无线充电器02与电子设备01对应，例如，当电子设备01为手机时，无线充电器02可以为平放式的手机无线充电器或立式的手机无线充电器。此时的无线充电系统可以参见图1所示。
当无线充电器的发射线圈与电子设备的接收线圈之间存在水平位置偏移且无金属异物时，发射线圈与接收线圈之间的功率损耗是由于发射线圈与接收线圈之间的水平位置偏移导致，电子设备的接收线圈和辅助线圈对发射线圈存在不同的互感，电子设备的线圈对应的互感的比值和水平位置偏移之间存在的对应关系可以预先测量确定，而水平位置偏移对应的引起的功率损耗可以预先测量确定，进而能够由电子设备的线圈对应的互感的比值确定由水平位置偏移引起的误差功率，而电子设备的线圈的感应电压与对应的互感成正比，因此可以通过电子设备的线圈的输出电压获取电子设备的 线圈之间对应的互感的比值。
综上所述，该无线充电系统的电子设备的控制器能够根据任意两个线圈分别与所述发射线圈的线圈耦合关系获得误差功率，即当只包括一个辅助线圈时，可以利用接收线圈和辅助线圈分别与发射线圈的线圈耦合关系获得误差功率；当包括两个辅助线圈时，可以利用两个辅助线圈分别与发射线圈的线圈耦合关系获得误差功率，该误差功率表征由发射线圈和接收线圈之间的水平位置偏移引起的功率损耗，误差功率与该比值正相关。控制器由输出功率和所述误差功率获得补偿后的输出功率，将所述补偿后的输出功率发送给无线充电器，以使无线充电器根据输入功率和所述补偿后的输出功率获得功率损耗。此时该功率损耗中由发射线圈和接收线圈之间的水平位置偏移引起的功率损耗已经被补偿。
因此能够使得在进行金属异物检测时，不会将由于发射线圈与接收线圈之间的水平位置偏移导致认定为是由金属异物引起的损耗，避免了在发射线圈与接收线圈之间无金属异物但存在水平位置偏移时错误的判定发射线圈与接收线圈之间存在金属异物，因此还提升金属异物检测的准确度。此外，当接收线圈和辅助线圈设置在同一平面时，不会增加线圈模组的厚度，还便于电子设备实现轻薄化，实用性高。
本申请实施例所述的发射端控制器和接收端控制器可以为专用集成电路(application-specific integrated circuit，ASIC)，可编程逻辑器件(programmable logic device，PLD)或其组合。上述PLD可以是复杂可编程逻辑器件(complex programmable logic device，CPLD)，现场可编程逻辑门阵列(field-programmable gate array，FPGA)，通用阵列逻辑(generic array logic,GAL)或其任意组合，本申请实施例不作具体限定。
应当理解，在本申请中，“至少一个(项)”是指一个或者多个，“多个”是指两个或两个以上。“和/或”，用于描述关联对象的关联关系，表示可以存在三种关系，例如，“A和/或B”可以表示：只存在A，只存在B以及同时存在A和B三种情况，其中A，B可以是单数或者复数。字符“/”一般表示前后关联对象是一种“或”的关系。“以下至少一项(个)”或其类似表达，是指这些项中的任意组合，包括单项(个)或复数项(个)的任意组合。例如，a，b或c中的至少一项(个)，可以表示：a，b，c，“a和b”，“a和c”，“b和c”，或“a和b和c”，其中a，b，c可以是单个，也可以是多个。
以上所述，仅是本申请的较佳实施例而已，并非对本申请作任何形式上的限制。虽然本申请已以较佳实施例揭露如上，然而并非用以限定本申请。任何熟悉本领域的技术人员，在不脱离本申请技术方案范围情况下，都可利用上述揭示的方法和技术内容对本申请技术方案做出许多可能的变动和修饰，或修改为等同变化的等效实施例。因此，凡是未脱离本申请技术方案的内容，依据本申请的技术实质对以上实施例所做的任何简单修改、等同变化及修饰，均仍属于本申请技术方案保护的范围内。

Claims (30)

  1. 一种电子设备，其特征在于，包括：控制器、收发器和至少两个线圈；
    所述至少两个线圈中包括一个接收线圈，和一个或者多个辅助线圈；
    所述接收线圈，用于耦合无线充电器的发射线圈的电能为所述电子设备中的电池充电；
    所述辅助线圈，用于补偿所述电子设备和所述无线充电器之间的水平位置偏移引起的误差功率；
    所述控制器，用于利用所述至少两个线圈中任意两个线圈分别与所述发射线圈的线圈耦合关系获得所述误差功率，由所述电子设备中给充电电路的输出功率和所述误差功率获得补偿后的输出功率，将所述补偿后的输出功率发送给所述收发器；
    所述收发器，用于将所述补偿后的输出功率发送给所述无线充电器，以使所述无线充电器根据所述无线充电器的输入功率和所述补偿后的输出功率获得功率损耗。
  2. 根据权利要求1所述的电子设备，其特征在于，所述线圈耦合关系包括以下任意一种：线圈互感、线圈耦合系数或所述电子设备中的线圈从所述发射线圈耦合的电压大小；所述线圈互感与所述电子设备中线圈的输出电压成正比；所述线圈耦合系数与所述电子设备中线圈的输出电压成正比。
  3. 根据权利要求2所述的电子设备，其特征在于，所述控制器，用于利用所述至少两个线圈中任意两个线圈分别与所述发射线圈的线圈耦合关系获得误差功率，具体包括：
    所述控制器，用于利用所述至少两个线圈中任意两个线圈分别与所述发射线圈的线圈耦合关系的比值获得误差功率，所述误差功率与所述比值存在正相关的对照关系。
  4. 根据权利要求3所述的电子设备，其特征在于，所述至少两个线圈包括：接收线圈和第一辅助线圈；
    所述控制器，用于利用所述至少两个线圈中任意两个线圈分别与所述发射线圈的线圈耦合关系的比值获得误差功率，具体包括：
    所述控制器，利用所述接收线圈的输出电压和所述第一辅助线圈的输出电压的比值获得误差功率。
  5. 根据权利要求3所述的电子设备，其特征在于，所述至少两个线圈包括：接收线圈和第一辅助线圈，所述电子设备还包括：与所述接收线圈连接的第一整流器，和与所述第一辅助线圈连接的第二整流器；
    所述控制器，用于利用所述至少两个线圈中任意两个线圈分别与所述发射线圈的线圈耦合关系的比值获得误差功率，具体包括：
    所述控制器，用于根据所述第一整流器的第一输出电压和所述第二整流器的第二输出电压的比值获得误差功率。
  6. 根据权利要求5所述的电子设备，其特征在于，所述控制器，还用于根据预设阻抗和所述第一整流器的输出电流对所述第一输出电压进行补偿，并获得补偿后的电压与所述第二电压的比值。
  7. 根据权利要求3所述的电子设备，其特征在于，所述至少两个线圈包括：接收线圈、第一辅助线圈和第二辅助线圈；
    所述控制器，用于利用所述至少两个线圈中任意两个线圈分别与所述发射线圈的线圈耦合关系的比值获得误差功率，具体包括：
    所述控制器，用于利用所述第一辅助线圈的输出电压和所述第二辅助线圈的输出电压的比值获得误差功率。
  8. 根据权利要求3所述的电子设备，其特征在于，所述至少两个线圈包括：接收线圈、第一辅助线圈和第二辅助线圈，所述电子设备还包括：与所述接收线圈连接的第一整流器、与所述第一辅助线圈连接的第二整流器和与所述第二辅助线圈连接的第三整流器；
    所述控制器，用于利用所述至少两个线圈中任意两个线圈分别与所述发射线圈的线圈耦合关系的比值获得误差功率，具体包括：
    所述控制器，用于根据所述第二整流器的输出电压和所述第三整流器的输出电压的比值获得误差功率。
  9. 根据权利要求2-8任一项所述的电子设备，其特征在于，所述接收线圈和所述辅助线圈位于同一个平面。
  10. 根据权利要求2-8任一项所述的电子设备，其特征在于，所述接收线圈的中心和所述辅助线圈的中心重合。
  11. 根据权利要求1所述的电子设备，其特征在于，所述接收线圈与所述辅助线圈的位置为以下任意一种：
    所述辅助线圈位于所述接收线圈的径向内围、所述辅助线圈位于所述接收线圈的径向外围、所述辅助线圈的不同部分分别位于所述接收线圈的径向内围和径向外围。
  12. 根据权利要求1所述的电子设备，其特征在于，所述辅助线圈至少包括以下两个：第一辅助线圈和第二辅助线圈；
    所述接收线圈与所述辅助线圈的位置为以下任意一种：
    所述第一辅助线圈和所述第二辅助线圈均位于所述接收线圈的径向内围、所述第一辅助线圈和所述第二辅助线圈均位于所述接收线圈的径向外围、所述第一辅助线圈和所述第二辅助线圈分别位于所述接收线圈的径向内围和径向外围。
  13. 根据权利要求2-8任一项所述的电子设备，其特征在于，所述辅助线圈为一匝或多匝；
    当所述辅助线圈为多匝时，所述多匝的端头并联在一起或串联在一起。
  14. 根据权利要求2-8任一项所述的电子设备，其特征在于，所述控制器，还用于根据所述比值获得所述发射线圈与所述接收线圈之间的水平位置偏移，所述比值与所述水平位置偏移正相关。
  15. 根据权利要求13所述的电子设备，其特征在于，还包括：显示屏；
    所述控制器，还用于将所述水平位置偏移发送给所述显示屏进行显示。
  16. 根据权利要求3-8任一项所述的电子设备，其特征在于，所述控制器，还用于获得所述电子设备和所述无线充电器的垂直距离，根据所述垂直距离获得对应的所述对照关系。
  17. 一种功率补偿方法，其特征在于，应用于无线充电的电子设备，所述电子设备包括：存储器、控制器和至少两个线圈；所述至少两个线圈中包括一个接收线圈，和一个或者多 个辅助线圈；以及一个或多个计算机程序，其中所述一个或多个计算机程序被存储在所述存储器中，所述一个或多个计算机程序包括指令，当所述指令被所述电子设备执行时，使得所述电子设备执行以下步骤：
    根据所述至少两个线圈中任意两个线圈分别与发射线圈的线圈耦合关系获得误差功率；
    由所述电子设备中给充电电路的输出功率和所述误差功率获得补偿后的输出功率；
    将所述补偿后的输出功率发送给所述无线充电器，以使所述无线充电器根据所述无线充电器的输入功率和所述补偿后的输出功率获得功率损耗。
  18. 根据权利要求17所述的方法，其特征在于，所述线圈耦合关系包括以下任意一种：线圈互感、线圈耦合系数或所述电子设备中的线圈从所述发射线圈耦合的电压大小；所述线圈互感与所述电子设备中线圈的输出电压成正比；所述线圈耦合系数与所述电子设备中线圈的输出电压成正比。
  19. 根据权利要求18所述的方法，其特征在于，所述利用所述至少两个线圈中任意两个线圈分别与所述发射线圈的线圈耦合关系获得误差功率，具体包括：
    利用所述至少两个线圈中任意两个线圈分别与发射线圈的线圈耦合关系的比值获得误差功率，所述误差功率与所述比值存在正相关的对照关系。
  20. 根据权利要求19所述的方法，其特征在于，所述至少两个线圈包括：接收线圈和第一辅助线圈时，所述利用所述至少两个线圈中任意两个线圈分别与发射线圈的线圈耦合关系的比值获得误差功率，具体包括：
    利用所述接收线圈的输出电压和所述第一辅助线圈的输出电压的比值获得误差功率。
  21. 根据权利要求19所述的方法，其特征在于，所述至少两个线圈包括：接收线圈和第一辅助线圈，所述电子设备还包括：与所述接收线圈连接的第一整流器，和与所述第一辅助线圈连接的第二整流器；
    所述利用所述至少两个线圈中任意两个线圈分别与发射线圈的线圈耦合关系的比值获得误差功率，具体包括：
    根据所述第一整流器的第一输出电压和所述第二整流器的第二输出电压的比值获得误差功率。
  22. 根据权利要求21所述的方法，其特征在于，所述方法还包括：根据预设阻抗和所述接收线圈的电流获得补偿电压，利用所述补偿电压对所述第一输出电压进行补偿，获得补偿后的电压与所述第二电压的比值。
  23. 根据权利要求19所述的方法，其特征在于，所述至少两个线圈包括：接收线圈、第一辅助线圈和第二辅助线圈；
    所述利用所述至少两个线圈中任意两个线圈分别与发射线圈的线圈耦合关系的比值获得误差功率，具体包括：
    利用所述第一辅助线圈的输出电压和所述第二辅助线圈的输出电压的比值获得误差功率。
  24. 根据权利要求19所述的方法，其特征在于，所述至少两个线圈包括：接收线圈、第一辅助线圈和第二辅助线圈，所述电子设备还包括：与所述接收线圈连接的第一整流器、 与所述第一辅助线圈连接的第二整流器和与所述第二辅助线圈连接的第三整流器；
    所述利用所述至少两个线圈中任意两个线圈分别与发射线圈的线圈耦合关系的比值获得误差功率，具体包括：
    根据所述第二整流器的输出电压和所述第三整流器的输出电压的比值获得误差功率。
  25. 根据权利要求17-24任一项所述的方法，其特征在于，所述方法还包括：根据所述比值获得所述发射线圈与所述接收线圈之间的水平位置偏移，所述比值与所述水平位置偏移正相关。
  26. 根据权利要求25所述的方法，其特征在于，所述电子设备还包括：显示屏；
    该方法还包括：将所述水平位置偏移发送给所述显示屏进行显示。
  27. 根据权利要求19-26任一项所述的方法，其特征在于，所述方法还包括：获得所述电子设备和所述无线充电器的垂直距离，根据所述垂直距离获得对应的所述对照关系。
  28. 一种无线充电系统，其特征在于，包括无线充电器和权利要求1-16任一项所述的电子设备；
    所述无线充电器包括：发射线圈；
    所述发射线圈，用于向所述接收线圈发射电能为所述电子设备进行无线充电。
  29. 根据权利要求28所述的系统，其特征在于，所述无线充电器包括：发射端控制器；
    所述发射端控制器，用于根据输入功率和所述补偿后的输出功率获得功率损耗，当所述功率损耗大于预设功率阈值时，确定所述发射线圈和所述接收线圈之间存在金属异物。
  30. 根据权利要求28所述的系统，其特征在于，所述无线充电器还包括信号灯；
    所述信号灯用于当所述发射端控制器确定发射线圈和所述接收线圈之间存在金属异物时，或在所述发射线圈和接收线圈之间存在水平位置偏移时进行提示。
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