WO2023226615A1 - 一种无线充电装置、电子设备及无线充电控制方法 - Google Patents

一种无线充电装置、电子设备及无线充电控制方法 Download PDF

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Publication number
WO2023226615A1
WO2023226615A1 PCT/CN2023/088320 CN2023088320W WO2023226615A1 WO 2023226615 A1 WO2023226615 A1 WO 2023226615A1 CN 2023088320 W CN2023088320 W CN 2023088320W WO 2023226615 A1 WO2023226615 A1 WO 2023226615A1
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WO
WIPO (PCT)
Prior art keywords
wireless charging
inverter
operating frequency
charging device
power
Prior art date
Application number
PCT/CN2023/088320
Other languages
English (en)
French (fr)
Other versions
WO2023226615A9 (zh
Inventor
刘剑
Original Assignee
荣耀终端有限公司
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Application filed by 荣耀终端有限公司 filed Critical 荣耀终端有限公司
Publication of WO2023226615A1 publication Critical patent/WO2023226615A1/zh
Publication of WO2023226615A9 publication Critical patent/WO2023226615A9/zh

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Classifications

    • 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
    • H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
    • H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
    • 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
    • H02J50/70—Circuit arrangements or systems for wireless supply or distribution of electric power involving the reduction of electric, magnetic or electromagnetic leakage fields
    • 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

  • the present application relates to the field of terminal technology, and in particular, to a wireless charging device, electronic equipment and a wireless charging control method.
  • Wireless charging also known as induction charging and non-contact induction charging, is a charging method in which a wireless charging device sends energy to an electronic device, and the electronic device uses the received energy to charge its own battery. During wireless charging, there is no need to use physical cables to connect the wireless charging device and the electronic device.
  • the wireless charging device includes a power transmitting coil, which is used to convert alternating current into an alternating magnetic field to transmit energy to the outside.
  • the electronic device includes a power receiving coil for converting the received alternating magnetic field into alternating current. That is to say, energy is currently transmitted between the power transmitting coil and the power receiving coil through magnetic field coupling.
  • the present application provides a wireless charging device, electronic equipment and a wireless charging control method, so that when there is a metal foreign object between the transmitting coil and the receiving coil, the efficiency of wireless charging is improved, thereby reducing the cost of wireless charging.
  • the user experience is improved.
  • this application provides a wireless charging device for wirelessly charging electronic equipment.
  • the wireless charging device includes: an inverter, a transmitter resonant circuit and a transmitter controller.
  • the inverter is used to convert DC power into AC power and then transmits it to the transmitter resonant circuit;
  • the transmitter resonant circuit includes a transmitter resonant capacitor and a power transmit coil connected in series;
  • the transmitter controller is used to obtain the current quality factor of the transmitter resonant circuit , and when it is determined that there is a metal foreign object between the wireless charging device and the electronic device using the current quality factor, the operating frequency of the inverter is increased.
  • the operating frequency of the inverter that controls the wireless charging device increases.
  • the working frequency of the device can improve the efficiency of wireless charging.
  • the current solution of reducing the transmit power of the wireless charging device after detecting metal foreign objects will extend the wireless charging time. Therefore, compared with the existing solution, the technical solution of this application is more efficient and reduces the wireless charging time under the premise of the same transmission power. Improved user experience.
  • the transmitter controller is specifically configured to determine the reference value of the quality factor based on the current operating frequency of the inverter and the pre-calibrated correspondence between the operating frequency of the inverter and the quality factor; When the difference between the reference value of the quality factor and the current quality factor is greater than the preset threshold, it is determined that there is a metal foreign object between the wireless charging device and the electronic device.
  • the transmitter controller is specifically configured to determine the target operating frequency of the inverter based on the current quality factor and the pre-calibrated correspondence between the target operating frequency of the inverter and the current quality factor, And control the inverter to work at the target operating frequency, which is greater than the current operating frequency.
  • the transmitter controller is specifically used to determine the power loss value, and determine the inverter according to the power loss value and the pre-calibrated correspondence between the target operating frequency of the inverter and the power loss value. target operating frequency, and controls the inverter to work at the target operating frequency, which is greater than the current operating frequency.
  • the wireless charging device further includes: a transmitter transceiver.
  • the transmitter transceiver is used to receive the output power information sent by the electronic device and send the output power information to the transmitter controller.
  • the output power information indicates the output power of the rectifier of the electronic device.
  • the transmitter controller is specifically used to determine the power loss value based on the input power and output power information of the wireless charging device.
  • the wireless charging device further includes: a transmitter transceiver.
  • the transmitter transceiver is used to send input power information to the electronic device, receive the power loss information sent by the electronic device, and send the power loss information to the transmitter controller.
  • the input power information indicates the input power of the wireless charging device, and the power loss information Indicates the power loss value; the transmitter controller is specifically used to determine the power loss value based on the power loss information.
  • the wireless charging device further includes: a transmitter transceiver.
  • the transmitter transceiver is used to send input power information to the electronic device, receive the first parameter information sent by the electronic device, and send the first parameter information to the transmitter controller.
  • the input power information indicates the input power of the wireless charging device.
  • One parameter information indicates the target operating frequency of the inverter; the transmitter controller is specifically used to determine the power loss value according to the first parameter information.
  • the wireless charging device further includes: a transmitting end transceiver; the transmitting end transceiver is used to send second parameter information to the electronic device, and the second parameter information is used to indicate the current quality factor, and the receiving electronic device
  • the third parameter information is sent and sent to the transmitter controller.
  • the third parameter information is used to indicate the target operating frequency of the inverter, and the target operating frequency is greater than the current operating frequency; the transmitter controller is used to indicate the target operating frequency of the inverter.
  • the third parameter information determines the target operating frequency of the inverter.
  • the wireless charging device further includes a detection circuit.
  • the detection circuit is used to obtain the voltage signal of the resonant circuit at the transmitting end and convert the voltage signal into a digital square wave signal;
  • the transmitting end controller is used to receive the digital square wave signal and obtain the resonant voltage of the damped oscillation based on the digital square wave signal. attenuate the waveform, and determine the current quality factor based on the resonant voltage attenuation waveform.
  • this application also provides an electronic device, which includes: a receiving end resonant circuit, a rectifier, a receiving end controller, and a receiving end transceiver.
  • the receiving end resonant circuit includes a receiving end resonant capacitor and a power receiving coil connected in series; the rectifier is used to convert the alternating current output by the receiving end resonant circuit into direct current; the receiving end controller is used to Determine parameter information, and send the parameter information to the wireless charging device through the receiving end transceiver, so that the wireless charging device determines the target operating frequency of the inverter based on the parameter information.
  • the operating frequency of the inverter that controls the wireless charging device increases.
  • the efficiency of wireless charging can be improved. efficiency.
  • the current solution of reducing the transmit power of the wireless charging device after detecting metal foreign objects will extend the wireless charging time. Therefore, compared with the existing solution, the technical solution of the present application is more efficient under the premise of the same transmission power, thus reducing the wireless charging time and improving the user experience.
  • the parameter information is the output power of the rectifier
  • the receiving end controller is specifically used to determine the output power of the rectifier based on the output voltage and output current of the rectifier;
  • the receiving end transceiver is used to send output power information to the wireless charging device, and the output power information is used to indicate the output power of the rectifier of the electronic device.
  • the parameter information is a power loss value
  • the receiving end controller is used to determine the output power of the rectifier based on the output voltage and output current of the rectifier; determine the power loss value based on the output power of the rectifier and the input power information sent by the receiving end transceiver, and the input power information indicates the wireless charging device input power;
  • the receiving end transceiver is used to receive input power information sent by the wireless charging device, send the input power information to the receiving end controller, and send power loss information to the wireless charging device, where the power loss information is used to indicate the power loss value.
  • the parameter information is the target operating frequency of the inverter
  • the receiving end controller is used to determine the output power of the rectifier based on the output voltage and output current of the rectifier; determine the power loss value based on the output power of the rectifier and the input power information sent by the receiving end transceiver; and based on the power loss value, and The corresponding relationship between the pre-calibrated power loss value and the target operating frequency of the inverter determines the target operating frequency of the inverter, and the input power information indicates the input power of the wireless charging device;
  • the receiving end transceiver is used to receive input power information sent by the wireless charging device, send the input power information to the receiving end controller, and send first parameter information to the wireless charging device, where the first parameter information is used to indicate the inverter. Target operating frequency.
  • the parameter information is the target operating frequency of the inverter
  • the receiving end controller is used to determine the target operating frequency of the inverter based on the second parameter information sent by the receiving end transceiver and the pre-calibrated correspondence between the current quality factor and the target operating frequency of the inverter.
  • the second parameter information is used to indicate the current quality factor, and the target operating frequency is greater than the current operating frequency;
  • the receiving end transceiver is used to receive the second parameter information sent by the wireless charging device, send the second parameter information to the receiving end controller, and send the third parameter information to the wireless charging device, and the third parameter information is used to indicate the inversion The target operating frequency of the device.
  • the application also provides a wireless charging control method, which method is applied to a wireless charging device.
  • the wireless charging device is used to wirelessly charge electronic equipment.
  • the method includes the following steps:
  • the operating frequency of the inverter is increased.
  • the operating frequency of the inverter of the wireless charging device is controlled to increase.
  • the working frequency of the inverter can improve the efficiency of wireless charging. Compared with existing solutions, under the premise of the same transmission power, since the solution of this application is more efficient, it reduces the wireless charging time and improves the user experience.
  • the operating frequency of the inverter is increased, specifically including:
  • increasing the operating frequency of the inverter specifically includes:
  • the target operating frequency of the inverter based on the current quality factor of the inverter and the pre-calibrated relationship between the target operating frequency of the inverter and the current quality factor.
  • the target operating frequency is greater than the current operating frequency
  • increasing the operating frequency of the inverter specifically includes:
  • the power loss value is determined, specifically including:
  • Receive output power information sent by the electronic device the output power information indicating the output power of the rectifier of the electronic device
  • the power loss value is determined based on the input power and output power information of the wireless charging device.
  • the power loss value is determined, specifically including:
  • the input power information indicating the input power of the wireless charging device
  • the power loss value is determined, specifically including:
  • the input power information indicating the input power of the wireless charging device
  • the power loss value is determined according to the first parameter information.
  • increasing the operating frequency of the inverter specifically includes:
  • the third parameter information is used to indicate the target operating frequency of the inverter, and the target operating frequency is greater than the current operating frequency;
  • the target operating frequency of the inverter is determined according to the third parameter information.
  • this application also provides a wireless charging control method, which method is applied to electronic devices.
  • the method includes:
  • the target operating frequency of the inverter is greater than the current frequency of the inverter. working frequency.
  • the operating frequency of the inverter of the wireless charging device is controlled to increase.
  • the efficiency of wireless charging can be improved.
  • the parameter information is the output power of the rectifier of the electronic device, the parameter information is determined, and the parameter information is sent to the wireless charging device through the receiving end transceiver, specifically including:
  • Output power information is sent to the wireless charging device, and the output power information indicates the output power of the rectifier of the electronic device.
  • the parameter information is a power loss value
  • the parameter information is determined
  • the parameter information is sent to the wireless charging device through the receiving end transceiver, which specifically includes: receiving the input power information sent by the wireless charging device, inputting the power The information indicates the input power of the wireless charging device;
  • Power loss information is sent to the wireless charging device, and the power loss information indicates the power loss value.
  • the parameter information is the target operating frequency of the inverter
  • the parameter information is determined
  • the parameter information is sent to the wireless charging device through the receiving end transceiver, specifically including:
  • the parameter information is the target operating frequency of the inverter
  • the parameter information is determined
  • the parameter information is sent to the wireless charging device through the receiving end transceiver, specifically including:
  • Receive second parameter information sent by the wireless charging device where the second parameter information is used to indicate the current quality factor of the transmitter resonant circuit of the wireless charging device
  • the second parameter information sent by the receiving end transceiver and the corresponding relationship between the pre-calibrated current quality factor and the target operating frequency of the inverter, determine the target operating frequency of the inverter, and the target operating frequency is greater than the current operating frequency;
  • Third parameter information is sent to the wireless charging device, and the third parameter information indicates the target operating frequency of the inverter.
  • Figure 1 is a schematic diagram of an electronic device
  • Figure 2 is a schematic diagram of wireless charging of electronic devices
  • FIG. 3 is a circuit diagram of the wireless charging system
  • Figure 4 is a schematic diagram of the scenario provided by this application.
  • Figure 5 is a schematic diagram of the second scenario provided by this application.
  • Figure 6 is a schematic diagram of the magnetic field line distribution when the power transmitting coil provided by this application is working
  • Figure 7 is a schematic diagram of the magnetic field line distribution when there is a metal foreign object between the power transmitting coil and the power receiving coil provided by this application;
  • Figure 8 is a schematic diagram of the eddy current distribution on the metal foreign body when there is a metal foreign body between the power transmitting coil and the power receiving coil provided by this application;
  • Figure 9 is a schematic diagram of the temperature distribution of the temperature increase of the metal foreign body caused by the eddy current on the metal foreign body when there is a metal foreign body between the power transmitting coil and the power receiving coil provided by this application;
  • Figure 10 is a schematic diagram of energy distribution on metal foreign objects during the wireless charging process provided by this application.
  • Figure 11 is a schematic circuit diagram of a wireless charging system provided by an embodiment of the present application.
  • Figure 12 is a schematic diagram of another wireless charging system provided by an embodiment of the present application.
  • Figure 13 is a schematic diagram of another wireless charging system provided by an embodiment of the present application.
  • Figure 14 is a schematic diagram of yet another wireless charging system provided by an embodiment of the present application.
  • FIG. 15 is a schematic diagram of another wireless charging system provided by an embodiment of the present application.
  • Figure 16 is a schematic diagram of another wireless charging system provided by an embodiment of the present application.
  • Figure 17 is a flow chart of a wireless charging control method provided by an embodiment of the present application.
  • Figure 18 is a flow chart of another wireless charging control method provided by an embodiment of the present application.
  • Figure 19 is a flow chart of yet another wireless charging control method provided by an embodiment of the present application.
  • Figure 20 is a flow chart of yet another wireless charging control method provided by an embodiment of the present application.
  • Figure 21 is a flow chart of another wireless charging control method provided by an embodiment of the present application.
  • Figure 1 is a schematic diagram of an electronic device.
  • the embodiments of this application do not specifically limit the type of electronic device.
  • the electronic device may be a mobile phone, a laptop, a wearable electronic device (such as a smart watch), a tablet, an augmented reality (AR) device, or a virtual reality (virtual reality). , VR) equipment and vehicle-mounted equipment, etc.
  • AR augmented reality
  • VR virtual reality
  • the electronic device 10 may include a processor 11, an audio module 12, a speaker 121, a receiver 122, a microphone 123, a headphone interface 124, a universal serial bus (USB) interface 13, a charging management module 14, a power management module 141, Battery 142, wireless charging module 143, antenna group 1, antenna group 2, mobile communication module 15, wireless communication module 16, sensor module 17, etc.
  • a processor 11 an audio module 12
  • a speaker 121 a speaker 121
  • a receiver 122 a microphone 123
  • a headphone interface 124 a universal serial bus (USB) interface 13
  • USB universal serial bus
  • a charging management module 14 a power management module 141, Battery 142, wireless charging module 143, antenna group 1, antenna group 2, mobile communication module 15, wireless communication module 16, sensor module 17, etc.
  • FIG. 1 does not constitute a specific limitation on the electronic device 10 .
  • Electronic device 10 may include more or fewer components than illustrated, some components may be combined, some components may be separated, or components may be arranged differently.
  • the components illustrated may be implemented in hardware, software, or a combination of software and hardware.
  • the processor 11 may include one or more processing units.
  • the processor 11 may include an application processor (application processor, AP), a modem processor, a graphics processing unit (GPU), and an image signal processor. (image signal processor, ISP), controller, video codec, digital signal processor (DSP), baseband processor, and/or neural-network processing unit, NPU) etc.
  • application processor application processor
  • GPU graphics processing unit
  • image signal processor image signal processor
  • ISP image signal processor
  • DSP digital signal processor
  • NPU neural-network processing unit
  • different processing units can be independent devices or integrated in one or more processors.
  • the controller can generate operation control signals based on the instruction operation code and timing signals to complete the control of fetching and executing instructions.
  • the processor 110 may also be provided with a memory for storing instructions and data.
  • the memory in processor 110 is cache memory. This memory may hold instructions or data that have been recently used or recycled by processor 110 . If the processor 110 needs to use the instructions or data again, it can be called directly from the memory. Repeated access is avoided and the waiting time of the processor 110 is reduced, thus improving the efficiency of the system.
  • the USB interface 13 is an interface that complies with the USB standard specifications. Specifically, it can be a Mini USB interface, a Micro USB interface, a USB Type C interface, etc.
  • the USB interface 13 can be used to connect a charger to charge the electronic device 10, and can also be used to transmit data between the electronic device 10 and peripheral devices. It can also be used to connect headphones to play audio through them. This interface can also be used to connect other electronic devices, such as AR devices, etc.
  • the interface connection relationships between the modules illustrated in the embodiment of the present invention are only schematic illustrations and do not constitute a structural limitation on the electronic device 10 .
  • the electronic device 10 may also adopt different interface connection methods in the above embodiments, or a combination of multiple interface connection methods.
  • the charge management module 14 is used to receive charging input from the charger.
  • the charger may be a wireless charging device or a wired charger.
  • the charging management module 14 may receive charging input from the wired charger through the USB interface 13 . In some wireless charging embodiments, the charging management module 14 may convert the received alternating magnetic field into alternating current through the power receiving coil of the wireless charging module 143 . While charging the battery 142, the charging management module 14 can also provide power to the electronic device through the power management module 141.
  • the electronic device can wirelessly charge other electronic devices, that is, the wireless charging coil of the electronic device can convert alternating current into an alternating magnetic field.
  • the wireless charging coil of other electronic devices can convert alternating current into an alternating magnetic field.
  • the wireless charging coil of other electronic devices approaches, the other electronic devices
  • the wireless charging coil converts the alternating magnetic field into alternating current, and then converts the alternating current into direct current to charge the batteries of other electronic devices.
  • the power management module 141 is used to connect the battery 142 , the charging management module 14 and the processor 11 .
  • the power management module 141 receives input from the battery 142 and/or the charging management module 14 to provide power to the processor 11, the mobile communication module 15, the wireless communication module 16, and the like.
  • the power management module 141 can also be used to monitor battery capacity, battery cycle times, battery health status (leakage, impedance) and other parameters.
  • the power management module 141 may also be provided in the processor 11 .
  • the power management module 141 and the charging management module 14 can also be provided in the same device.
  • the audio module 12 is used to convert digital audio information into analog audio signal output, and is also used to convert analog audio input into digital audio signals. Audio module 12 may also be used to encode and decode audio signals. In some embodiments, the audio module 12 may be disposed in the processor 11 , or some functional modules of the audio module 12 may be disposed in the processor 11 .
  • the Smart PA used to power the speaker 12 can be integrated in the audio module 12 or set up separately, which is not specifically limited in this application.
  • FIG. 2 is a schematic diagram of wireless charging of the electronic device 10
  • FIG. 3 is a circuit schematic diagram of the wireless charging system.
  • the electronic device 10 is a mobile phone as an example.
  • 20 wireless charging devices Support the electronic device 10 to be placed horizontally.
  • the wireless charging device 20 may also have other forms.
  • the wireless charging device 20 may be a vertical wireless charger with a certain inclination so that the electronic device 10 can lean against and be close to the wireless charging device. 20.
  • the wireless charging device may include a wireless power transmitting end 200.
  • the wireless power transmitting end 200 may include: an inverter 201, a transmitting end controller 202, a transmitting end transceiver 203, and a transmitting end resonant circuit.
  • the transmitting end resonance circuit includes a transmitting end resonant capacitor C1 and a power transmitting coil L1.
  • the inverter 201 can be used to convert direct current into alternating current and then transmit it to the transmitter resonant circuit.
  • the transmitter controller 202 can be used to control the working state of the inverter 201.
  • the transmitting end transceiver 203 may be a communication unit of the wireless power transmitting end.
  • the power transmitting coil L1 can be used to convert alternating current into an alternating magnetic field to transmit energy to the outside.
  • the electronic device 10 may include a wireless power receiving end 100, and the wireless power receiving end 100 may include: a rectifier 101, a receiving end controller 102, a receiving end transceiver 103, and a receiving end resonant circuit.
  • the receiving end resonant circuit may include a receiving end resonant capacitor C2 and a power receiving coil L2.
  • the power receiving coil L2 can be used to convert the received alternating magnetic field into alternating current.
  • the rectifier 101 may be used to convert alternating current into direct current and output it to the charging circuit 400 so that the charging circuit 400 charges the battery 142 .
  • the charging circuit 400 may be integrated into the charging management module 14 in FIG. 1 .
  • the receiving end controller 102 can be used to control the rectifier 101.
  • the receiving end transceiver 103 may be a communication unit of the wireless power receiving end.
  • the charging circuit 400 may be a Direct Current (DC)/DC conversion circuit, such as a boost circuit, a buck circuit, a buck-boost circuit, etc., which are not specifically limited in the embodiments of this application. .
  • DC Direct Current
  • the modulation method used in communication is the load modulation method, that is, the wireless power receiving end 100 modulates the data to be transmitted onto the power carrier, and the wireless power transmitting end 200 demodulates the change in the load by sampling the current or voltage waveform of the power transmitting coil L1 , and then receive data.
  • the communication information to be sent by the wireless power receiving end 100 may include, but is not limited to, information used for identity authentication and identification, and information used to indicate requirements for energy transmission.
  • the receiving end controller 102 can perform load control through an integrated low dropout linear regulator (LDO) and change the impedance of the LDO. This operation will cause the L2 current or coil voltage to change periodically, and the wireless power transmitting end 200 By detecting changes in L1 current or voltage, various communication information of the AC load is demodulated, and the output power is adjusted according to the request of the wireless power receiving end 100 .
  • LDO integrated low dropout linear regulator
  • the wireless power transmitter 200 can communicate with the wireless power receiver 100 through frequency-shift keying (FSK) modulation. That is, the wireless power transmitting end 200 can reciprocally increase/decrease the frequency of the power carrier so that the frequency of the power carrier received by the wireless power receiving end 100 fluctuates. When this fluctuation satisfies a specific rule, it can Send message.
  • FSK frequency-shift keying
  • the wireless power receiving end 100 can communicate with the wireless power transmitting end 200 through amplitude-shift keying (ASK) modulation. That is, the wireless power receiving end 100 can change the amplitude of the transmitted power carrier by changing its own resonant cavity parameters, causing regular fluctuations in the voltage or input current of L1, thereby transmitting communication information.
  • ASK amplitude-shift keying
  • Control signals or charging data can be transmitted between the wireless power transmitter 200 and the wireless power receiver 100 . Transmitting control signals or transmitting charging data can be achieved through in-band communication or out-of-band communication.
  • the wireless power transmitter 200 and the wireless power receiver 100 can be connected through Bluetooth, wireless broadband (Wi-Fi), Zigbee protocol (Zigbee), radio frequency identification technology (Radio Frequency Identification, RFID), long range , Lora) wireless technology or near field communication technology (Near Field Communication, NFC) and other out-of-band communication methods to achieve wireless connections.
  • the charging data can be used to indicate the type of charging.
  • the charging data may be a charging protocol, such as the wireless charging standard Qi launched by the Wireless Power Consortium (WPC).
  • the charging protocol may be, for example, the BPP (Basic Power Profile) protocol, or the EPP (Extended Power Profile) protocol, etc.
  • Figure 4 is the first schematic diagram of the scenario provided by this application
  • Figure 5 is the second schematic diagram of the scenario provided by this application.
  • Metal parts may be provided at the housing corresponding to the camera module to protect the camera module. However, as the camera module becomes larger, part of the metal parts 41 may overlap the power receiving coil (its outline is represented by the dotted circle in Figure 4) Above, the metal component may be an aluminum sheet, for example.
  • the ornament 51 can function as a stand, or can be used only for aesthetic purposes.
  • the ornament 51 can be fixed on the back cover of the mobile phone or on the mobile phone case.
  • the ornament 51 may be round, strip-shaped or other shapes.
  • the ornament 51 includes metal material.
  • Figure 6 is a schematic diagram of the distribution of magnetic lines of force when the power transmitting coil provided by the present application is working.
  • the coil at the bottom of Figure 6 is the power transmitting coil L1.
  • Figure 6 shows the magnetic field distribution when the current direction is counterclockwise.
  • the upper ring represents the metal foreign matter at the housing, that is, the metal component 41 in Figure 4 or Ornament 51 in Figure 5.
  • Figure 7 is a schematic diagram of the magnetic field line distribution when there is a metal foreign body between the power transmitting coil and the power receiving coil provided by this application
  • Figure 8 is a metal foreign body when there is a metal foreign body between the power transmitting coil and the power receiving coil provided by this application.
  • Figure 9 is a schematic diagram of the temperature distribution of the temperature increase of the metal foreign body caused by the eddy current on the metal foreign body when there is a metal foreign body between the power transmitting coil and the power receiving coil
  • Figure 10 is a schematic view of the temperature distribution of the metal foreign body provided by the present application Provided is a schematic diagram of energy distribution on metal foreign objects during wireless charging.
  • the lower coil is the power transmitting coil L1
  • the upper coil is the power receiving coil L2.
  • Energy is transmitted between the power transmitting coil L1 and the power receiving coil L2 through magnetic field coupling.
  • this application provides a wireless charging device, electronic equipment and a wireless charging control method.
  • the operating frequency of the inverter in the wireless charging device is increased. , to improve the efficiency of wireless charging, thereby relatively reducing the time of wireless charging and improving the user experience.
  • directional terms such as “upper” and “lower” may include, but are not limited to, defined relative to the schematically placed orientation of the components in the drawings. It should be understood that these directional terms may be relative concepts, and they are used Descriptions and clarifications relative to the drawings may vary accordingly depending on the orientation of components in the drawings.
  • connection should be understood in a broad sense.
  • connection can be a fixed connection, a detachable connection, or an integral body; it can be a direct connection or a direct connection. Can be connected indirectly through an intermediary.
  • FIG. 11 is a schematic circuit diagram of a wireless charging system provided by an embodiment of the present application.
  • the illustrated wireless charging system may include a wireless charging device 20 and an electronic device 10 .
  • the wireless charging device 20 may include an inverter 201, a transmitter resonant circuit and a transmitter controller 202.
  • the transmitter resonant circuit includes a transmitter resonant capacitor C1 and a power transmitter coil L1 connected in series.
  • the inverter 201 converts the DC power input from the power supply 30 into AC power and then transmits it to the transmitter resonant circuit.
  • the power supply 30 may be a power adapter of the wireless charging device 20 .
  • the power adapter converts the externally connected alternating current into direct current and supplies it to the inverter 201 .
  • the electronic device 10 may include a receiving end resonant circuit, a rectifier 101 and a receiving end controller 102 .
  • the receiving end resonant circuit includes a receiving end resonant capacitor C2 and a power receiving coil L2 connected in series.
  • the rectifier 101 is used to convert the alternating current output from the resonant circuit at the receiving end into direct current.
  • the detection methods of metal foreign objects usually include Ploss (Power loss) detection method and Q value method.
  • the Ploss detection method needs to obtain the input power of the wireless power transmitter, and then obtain the power loss based on the input power of the wireless power transmitter and the output power of the wireless power receiver.
  • the power loss is greater than the power threshold, determine the wireless power transmitter and wireless power receiver. There is metal foreign matter between the ends.
  • the Q value also known as the quality factor, or quality factor, is a dimensionless parameter in physics and engineering. It is a physical quantity that represents the damping properties of the oscillator. A larger Q value means that the energy loss rate of the oscillator is slower and the vibration can last for a longer time. That is to say, the smaller the loss of the charging circuit in the same cycle, the better the performance.
  • the detection of Q value is realized by the wireless power transmitter, and the Q value satisfies the following formula:
  • L 1 is the inductance value of the power transmitting coil
  • R tx is the AC impedance of the power transmitting coil
  • f is the resonant frequency of the resonant network of the wireless charging device.
  • the Q value is inversely proportional to the AC impedance R tx of the power transmitting coil.
  • R tx increases, which will cause the Q value to decrease.
  • the transmitter controller 202 in the embodiment of the present application is used to obtain the current quality factor Q 0 of the transmitter resonant circuit.
  • the working frequency of the large inverter 201 is used to improve the charging efficiency of the wireless charging device, reduce charging time, and improve user experience.
  • the inductance of the power transmitting coil L1 of the wireless charging device 20 was 5.7 microhenries (uH)
  • the equivalent series resistance (Equivalent Series Resistance, RSR) was 77 milliohms (m ⁇ )
  • the DC resistance was 47 m ⁇ .
  • the power receiving coil L2 of the electronic device 10 has an inductance of 7.6 microhenries (uH), an equivalent series resistance of 232 milliohms (m ⁇ ), and a DC resistance of 196 m ⁇ .
  • the input current of the inverter 201 is Iin
  • the input voltage of the inverter 201 is Vin
  • the current operating frequency of the inverter is Fop.
  • the output current of the rectifier 101 is Iout, and the output voltage of the rectifier 101 is Vout.
  • the coil distance value is the distance between the plane where the power transmitting coil L1 is located and the plane where the power receiving coil L2 is located:
  • Table 1 Test data when the metal foreign matter is magnetic at low frequency
  • Table 2 Test data when high frequency and metal foreign objects are magnetic
  • Table 3 and Table 4 list the test results when the metal foreign objects are non-magnetic and the operating frequency of the inverter is high frequency and low frequency respectively.
  • eta (magnetic) represents the charging efficiency when the metal foreign body is magnetic
  • eta (non-magnetic) represents the charging efficiency when the metal foreign body is non-magnetic
  • eta (non-magnetic - magnetic) represents the charging efficiency when the metal foreign body is non-magnetic.
  • the technical solution provided by the embodiment of the present application and using the current quality factor of the transmitter resonant circuit to determine that there is a metal foreign object between the wireless charging device and the electronic device, by increasing the operating frequency of the inverter, It can improve the efficiency of wireless charging, thereby reducing the time of wireless charging and improving the user experience. That is to say, compared with the existing solution that simply reduces the input power of the wireless charging device, under the same transmission power, the solution of this application is more efficient, thus reducing the wireless charging time and improving the user experience.
  • FIG 12 is a schematic diagram of another wireless charging system provided by an embodiment of the present application.
  • the inverter 201 of the electronic equipment shown in the figure is a full-bridge inverter, including a first bridge arm and a second bridge arm.
  • the first bridge arm includes a controllable switch S1 and a controllable switch S2 connected in series.
  • the second bridge arm includes a controllable switch S1 and a controllable switch S2 connected in series.
  • the controllable switch S3 and the controllable switch S4 are connected in series.
  • the midpoint of the first bridge arm and the midpoint of the second bridge arm are connected to the transmitter resonant circuit.
  • the rectifier 101 is a full-bridge rectifier, including a first bridge arm and a second bridge arm.
  • the first bridge arm includes a controllable switch Q1 and a controllable switch Q2 connected in series.
  • the second bridge arm includes a controllable switch Q3 and a controllable switch Q2 connected in series. Control switch Q4.
  • the midpoint of the first bridge arm and the midpoint of the second bridge arm are connected to the receiving end resonant circuit.
  • controllable switches S1 to S4 and controllable switches Q1 to Q4 can be any of the following: Insulated Gate Bipolar Transistor (IGBT) or Metal Oxide Semiconductor Field Effect Transistor (Metal Oxide Semiconductor Filed Effect Transistor (MOSFET, hereinafter referred to as MOS tube), silicon carbide field effect transistor (Silicon Carbide Metal Oxide Semiconductor, SiC MOSFET), etc.
  • IGBT Insulated Gate Bipolar Transistor
  • MOSFET Metal Oxide Semiconductor Field Effect Transistor
  • MOS tube Metal Oxide Semiconductor Filed Effect Transistor
  • SiC MOSFET silicon carbide field effect transistor
  • controllable The switches are all MOS tubes as an example.
  • the switches are MOS tubes
  • the first end of the switch is the drain
  • the second end of the switch is the source
  • the control end of the switch is the gate
  • the control end of the transmitter and receiver The device is connected to the gate of the controllable switch and sends a control signal to the switch, thereby switching the on-off state of the switch.
  • the control signal is a level signal
  • the switch is an NMOS tube
  • the switch is turned on when the control terminal of the switch is connected to a high level
  • the switch is turned off when the control terminal of the switch is connected to a low level.
  • the transmitter controller 202 and the receiver controller 101 can be an application specific integrated circuit (Application Specific Integrated Circuit, ASIC), a programmable logic device (Programmable Logic Device, PLD), a digital signal processor (Digital Signal Processor, DSP) or other combination.
  • ASIC Application Specific Integrated Circuit
  • PLD programmable logic device
  • DSP Digital Signal Processor
  • the above-mentioned PLD can be a complex programmable logic device (Complex Programmable Logic Device, CPLD), a field-programmable gate array (Field-programmable Gate Array, FPGA), a general array logic (Generic Array Logic, GAL) or any combination thereof.
  • the application examples are not specifically limited.
  • the detection circuit of the wireless charging device 20 acquires the voltage signal of the resonant circuit of the transmitter, converts the voltage signal into a digital square wave signal, and transmits the digital square wave signal to the transmitter controller 202 .
  • the transmitter controller 202 receives the digital square wave signal, obtains the resonant voltage attenuation waveform of the damped oscillation based on the digital square wave signal, and determines the current quality factor Q 0 based on the resonant voltage attenuation waveform.
  • the transmitter controller 202 can obtain the resonant voltage attenuation waveform of the damped oscillation according to the on and off states of the controllable switches S1 to S4. When the phase midpoint-to-ground voltage of the transmitter resonant circuit reaches the amplitude voltage of the excitation voltage source, damped oscillation occurs and a resonant voltage is generated. The transmitter controller 202 obtains the first parameter in the resonant voltage attenuation waveform that satisfies the first condition, and determines the current quality factor Q 0 based on the first parameter.
  • the preset condition is that during the oscillation period, the resonant voltage generated by the damped oscillation is greater than the reference voltage.
  • the first parameter can be the number of peaks, the number of troughs, or the sum of the number of peaks and troughs.
  • the number of wave peaks is the number of wave peaks that meet the preset conditions when S1 is turned off, S3 is turned on, S2 changes from on to off, and S4 changes from off to on.
  • the number of valleys is the number of valleys that meet the preset conditions when S2 is turned off, S4 is turned on, S1 changes from on to off, and S2 changes from off to on.
  • the sum of the number of wave peaks and the number of wave troughs is the sum of the number of wave peaks that meet the preset conditions and the sum of the number of wave troughs that meet the preset conditions.
  • the current quality factor Q 0 is:
  • n in formula (2) is the number of peaks or troughs
  • U1 and U2 are the peak voltage and trough voltage of any period in the resonant voltage attenuation waveform.
  • the current quality factor Q 0 is:
  • n in formula (3) is the sum of the number of peaks and the number of troughs.
  • the wireless power transmitting end can also use other implementation methods to determine the current quality factor Q 0 .
  • the embodiments of this application will not go into details. It can be understood that Yes, the technology for determining the current quality factor Q 0 is relatively mature at present, and other possible technical solutions can also be applied in this application.
  • the transmitter controller 202 determines the reference value Q r of the quality factor based on the current operating frequency of the inverter 201 and the pre-calibrated correspondence between the operating frequency of the inverter and the quality factor. When the difference between the reference value Q r of the quality factor and the current quality factor Q 0 is greater than the preset threshold, it is determined that there is a metal foreign object between the wireless charging device and the electronic device.
  • the embodiment of the present application does not specifically limit the preset threshold, and the value of the preset threshold can be calibrated in advance through experimental testing.
  • the corresponding relationship between the operating frequency and the quality factor of the inverter can be calibrated through testing and stored in the form of a data table.
  • the transmitter controller 202 determines that there is a metal foreign object between the wireless charging device 201 and the electronic device 101, it increases the operating frequency of the inverter 201. That is, even if the inverter 201 works at the target operating frequency, the target operating frequency is greater than the current operating frequency.
  • the following describes how the wireless charging device controls the inverter 201 to operate at the target operating frequency.
  • the transmitter controller 201 is used to determine the target of the inverter based on the current quality factor Q 0 of the inverter 201 and the corresponding relationship between the target operating frequency of the inverter and the current quality factor. working frequency.
  • the corresponding relationship between the target operating frequency of the inverter and the current quality factor can be pre-calibrated and stored in the form of a data table.
  • the corresponding target operating frequency is obtained through the look-up table method based on the current quality factor Q 0 . Then the transmitter controller 201 controls the inverter 201 to operate at the target operating frequency.
  • the transmitter controller 201 determines the power loss value, and determines the target of the inverter 201 based on the power loss value (Ploss) and the corresponding relationship between the target operating frequency of the inverter 201 and Ploss. working frequency.
  • the corresponding relationship between the target operating frequency and Ploss can be pre-calibrated and stored in the form of a data table.
  • the corresponding target operating frequency is obtained through a table lookup method based on Ploss. Then the transmitter controller 201 controls the inverter to operate at the target operating frequency.
  • Ploss is the difference between the input power of the inverter 201 and the output power of the rectifier 101 . The following explains how to determine Ploss.
  • the receiving end controller 102 is used to determine parameter information, and send the parameter information to the wireless charging device through the receiving end transceiver 103, so that the wireless charging device determines Ploss based on the parameter information, and then determines the target operating frequency of the inverter, The target operating frequency of the inverter is greater than the current operating frequency of the inverter.
  • the following describes the first implementation method of determining Ploss.
  • FIG. 13 is a schematic diagram of another wireless charging system provided by an embodiment of the present application.
  • the parameter information determined by the receiving end controller 102 is the output power of the rectifier 101 .
  • the receiving end controller 102 determines the output power Pout of the rectifier according to the output voltage Vout and the output current Iin of the rectifier 101 .
  • the receiving end transceiver 103 sends output power information to the transmitting end transceiver 203, and the output power information indicates the output power Pout of the rectifier 101 of the electronic device.
  • the transmitting end transceiver 203 receives the output power information and sends the output power information to the transmitting end controller 202 .
  • the transmitter controller 202 determines the input power Pin of the inverter 201 based on the input voltage Vin and the input current Iin of the inverter 201, and obtains the difference between the input power Pin and the output power Pout, which is Ploss.
  • FIG 14 is a schematic diagram of yet another wireless charging system provided by an embodiment of the present application.
  • the transmitter controller 202 determines the input power Pin of the inverter 201 based on the input voltage Vin and the input current Iin of the inverter 201 .
  • the transmitting end transceiver 203 sends input power information to the receiving end transceiver 103 of the electronic device, and the input power information indicates the input power Pin of the wireless charging device.
  • the receiving end controller 102 determines the output power Pout of the rectifier according to the output voltage Vout and the output current Iin of the rectifier 101 .
  • the receiving end transceiver 103 receives the input power information and sends the input power information to the receiving end controller 102 .
  • the receiving end controller 102 obtains the difference between the input power Pin and the output power Pout, which is Ploss.
  • the receiving end transceiver 103 sends power loss information to the transmitting end transceiver 203, and the power loss information indicates the power loss value Ploss.
  • the transmitting end transceiver 203 receives the power loss information and sends the power loss information to the transmitting end controller 202 so that the transmitting end controller 202 obtains Ploss.
  • the following describes how the electronic device first determines the target operating frequency of the inverter and then notifies the transmitter controller 202 of the implementation.
  • the following first describes the first implementation method of determining the target operating frequency of the inverter by electronic equipment.
  • FIG 15 is a schematic diagram of another wireless charging system provided by an embodiment of the present application.
  • the transmitter controller 202 determines the input power Pin of the inverter 201 based on the input voltage Vin and the input current Iin of the inverter 201 .
  • the transmitting end transceiver 203 sends input power information to the receiving end transceiver 103 of the electronic device, and the input power information indicates the input power Pin of the wireless charging device.
  • the receiving end controller 102 determines the output power Pout of the rectifier according to the output voltage Vout and the output current Iin of the rectifier 101 .
  • the receiving end transceiver 103 receives the input power information and sends the input power information to the receiving end controller 102 .
  • the receiving end controller 102 obtains the difference between the input power Pin and the output power Pout, which is Ploss.
  • the receiving end controller 102 determines the target operating frequency ft of the inverter 201 based on Ploss and the corresponding relationship between Ploss and the target operating frequency of the inverter. Among them, the corresponding relationship between Ploss and the target operating frequency of the inverter can be pre-calibrated and stored in the form of a data table.
  • the receiving end transceiver 103 sends first parameter information to the transmitting end transceiver 203, and the first parameter information indicates the target operating frequency ft of the inverter 201.
  • the transmitting end transceiver 203 receives the first parameter information and sends the first parameter information to the transmitting end controller 202, so that the transmitting end controller 202 obtains ft.
  • the following first describes another implementation method of determining the target operating frequency of the inverter by electronic equipment.
  • FIG 16 is a schematic diagram of another wireless charging system provided by an embodiment of the present application.
  • the transmitting end transceiver 203 After the transmitting end controller 202 determines the current quality factor Q 0 , the transmitting end transceiver 203 sends second parameter information to the receiving end transceiver 103 of the electronic device, and the second parameter information is used to indicate the current quality factor Q 0 .
  • the receiving end transceiver 103 receives the second parameter information and sends the second parameter information to the receiving end controller 102.
  • the receiving end controller 102 determines the target operating frequency ft of the inverter based on the current quality factor Q 0 carried in the second parameter information and the corresponding relationship between the current quality factor and the target operating frequency of the inverter. In a possible implementation manner, the corresponding relationship between the current quality factor and the target operating frequency of the inverter is pre-calibrated and stored in a data table display.
  • the receiving end transceiver 103 sends third parameter information to the transmitting end transceiver 203, and the third parameter information indicates the target operating frequency ft of the inverter 201.
  • the transmitting end transceiver 203 receives the third parameter information, and sends the third parameter information to the transmitting end controller 202, so that the transmitting end controller 202 obtains the target operating frequency ft of the inverter 201.
  • the solution provided by the above embodiments can be used to determine the target of the inverter.
  • Working frequency the target working frequency is greater than the current working frequency.
  • embodiments of the present application also provide a wireless charging control method, which will be described in detail below with reference to the accompanying drawings.
  • FIG 17 is a flow chart of a wireless charging control method provided by an embodiment of the present application.
  • the method is applied to a wireless charging device.
  • the specific implementation of the wireless charging device please refer to the relevant descriptions in the above embodiments.
  • the embodiments of the present application will not be repeated here.
  • the method includes the following steps:
  • the method for the wireless charging device to obtain the current quality factor is a relatively mature technology, and a possible implementation method is described below.
  • the resonant voltage attenuation waveform of the damped oscillation is obtained according to the on and off states of the controllable switches S1 to S4.
  • the phase midpoint-to-ground voltage of the transmitter resonant circuit reaches the amplitude voltage of the excitation voltage source, damped oscillation occurs and a resonant voltage is generated.
  • the preset condition is that during the oscillation period, the resonant voltage generated by the damped oscillation is greater than the reference voltage.
  • the first parameter can be the number of peaks, the number of troughs, or the sum of the number of peaks and troughs.
  • the number of wave peaks is the number of wave peaks that meet the preset conditions when S1 is turned off, S3 is turned on, S2 changes from on to off, and S4 changes from off to on.
  • the number of troughs is the number of troughs that meet the preset conditions when S2 is off, S4 is on, S1 changes from on to off, and S2 changes from off to on.
  • the sum of the number of wave peaks and the number of wave troughs is the sum of the number of wave peaks that meet the preset conditions and the sum of the number of wave troughs that meet the preset conditions.
  • the current quality factor Q 0 is:
  • n is the number of peaks or troughs
  • U1 and U2 are the peak voltage and trough voltage of any period in the resonant voltage attenuation waveform.
  • the current quality factor Q 0 is:
  • n’ is the sum of the number of peaks and troughs.
  • the reference value of the quality factor is determined based on the current operating frequency of the inverter and the pre-calibrated correspondence between the operating frequency of the inverter and the quality factor.
  • the difference between the reference value of the quality factor and the current quality factor is greater than the preset threshold, it is determined that there is a metal foreign object between the wireless charging device and the electronic device.
  • the wireless charging device determines the target operating frequency of the inverter, and the target operating frequency is greater than the current operating frequency.
  • the wireless charging device determines the target operating frequency of the inverter based on the current quality factor of the inverter and the pre-calibrated relationship between the target operating frequency of the inverter and the current quality factor, and controls the inverter to operate at the target operating frequency. , in order to increase the operating frequency of the inverter.
  • the wireless charging device determines the power loss value; and determines the target operating frequency of the inverter based on the power loss value and the pre-calibrated correspondence between the target operating frequency of the inverter and the power loss value. . Then control the inverter to work at the target operating frequency to increase the operating frequency of the inverter.
  • the efficiency of wireless charging can be improved by increasing the operating frequency of the inverter. , thereby avoiding extended wireless charging time and improving user experience.
  • the method After determining that there is a metal foreign object between the wireless charging device and the electronic device using the current quality factor, the method includes the following steps:
  • S201 Determine the output power Pout of the rectifier according to the output voltage Vout and the output current Iin of the rectifier.
  • S202 Send output power information to the wireless charging device.
  • the output power information indicates the output power Pout of the rectifier of the electronic device.
  • S203 Determine the input power Pin of the inverter based on the input voltage Vin and input current Iin of the inverter.
  • S205 Determine the target operating frequency of the inverter based on the power loss value Ploss and the pre-calibrated correspondence between the target operating frequency of the inverter and the power loss value.
  • the method After determining that there is a metal foreign object between the wireless charging device and the electronic device using the current quality factor, the method includes the following steps:
  • S301 Determine the input power Pin of the inverter based on the input voltage Vin and input current Iin of the inverter.
  • S302 Send input power information to the electronic device.
  • the input power information indicates the input power Pin of the wireless charging device.
  • S303 Determine the output power Pout of the rectifier based on the output voltage Vout and output current Iout of the rectifier.
  • S305 Send power loss information to the wireless charging device.
  • the power loss information indicates the power loss value Ploss.
  • S306 Determine the target operating frequency of the inverter based on the power loss value Ploss and the pre-calibrated correspondence between the target operating frequency of the inverter and the power loss value.
  • FIG 20 is a flow chart of yet another wireless charging control method provided by an embodiment of the present application.
  • the method After determining that there is a metal foreign object between the wireless charging device and the electronic device using the current quality factor, the method includes the following steps:
  • S401 Determine the input power Pin of the inverter based on the input voltage Vin and input current Iin of the inverter.
  • S402 Send input power information to the electronic device.
  • the input power information indicates the input power Pin of the wireless charging device.
  • S403 Determine the output power Pout of the rectifier based on the output voltage Vout and output current Iout of the rectifier.
  • S405 Determine the target operating frequency ft of the inverter based on the power loss value Ploss and the corresponding relationship between the power loss value Ploss and the target operating frequency of the inverter.
  • S406 Send the first parameter information to the electronic device.
  • the first parameter information indicates the target operating frequency ft of the inverter.
  • S407 Receive the first parameter information and control the inverter to operate at the target operating frequency ft.
  • the method After determining that there is a metal foreign object between the wireless charging device and the electronic device using the current quality factor, the method includes the following steps:
  • S501 Send second parameter information to the electronic device.
  • the second parameter information is used to indicate the current quality factor Q 0 .
  • S502 Determine the target operating frequency ft of the inverter based on the current quality factor Q 0 carried in the second parameter information and the corresponding relationship between the current quality factor and the target operating frequency of the inverter.
  • the corresponding relationship between the current quality factor and the target operating frequency of the inverter is pre-calibrated and stored in a data table display.
  • S503 Send third parameter information to the wireless charging device.
  • the third parameter information indicates the target operating frequency ft of the inverter.
  • S504 Receive the third parameter information and control the inverter to operate at the target operating frequency ft.
  • the target operating frequency of the inverter when it is determined that there is a metal foreign object between the wireless charging device and the electronic device by using the current quality factor of the transmitter resonant circuit, the target operating frequency of the inverter can be determined , the target operating frequency is greater than the current operating frequency.
  • the efficiency of wireless charging can be improved, thus reducing the time spent on wireless charging and improving the user experience. That is to say, compared with the existing technical solution, under the same transmission power, since the solution of this application is more efficient, it reduces the wireless charging time and improves the user experience.
  • At least one (item) refers to one or more, and “plurality” refers to two or more.
  • “And/or” is used to describe the relationship between associated objects, indicating that there can be three relationships, for example, “A and/or” “or B” can mean: there are only A, only B, or both A and B exist. Among them, A and B can be singular or plural.
  • the character “/” generally indicates that the related objects are an "or” relationship.
  • At least one of the following” or similar expressions refers to any combination of these items, including any combination of single or plural items.
  • At least one of a, b or c Item can mean: a, b, c, "a and b", “a and c", “b and c", or "a and b and c", where a, b, c can be single , or multiple.

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Abstract

一种无线充电装置、电子设备及无线充电控制方法，涉及终端技术领域与无线充电技术领域。该无线充电装置对电子设备进行无线充电，所述无线充电装置包括：逆变器、发射端谐振电路和发射端控制器；其中，所述逆变器用于将直流电转换为交流电后传输至所述发射端谐振电路；所述发射端谐振电路包括串联连接的发射端谐振电容和功率发射线圈；所述发射端控制器，用于获取所述发射端谐振电路的当前品质因数，以及当利用所述当前品质因数确定所述无线充电装置与所述电子设备之间存在金属异物时，增大所述逆变器的工作频率。本申请提供的方案，通过增大逆变器的工作频率，能够提升无线充电的效率，进而避免无线充电时间延长，进而提升了用户体验。

Description

一种无线充电装置、电子设备及无线充电控制方法
本申请要求于2022年05月25日提交中国国家知识产权局、申请号为202210577354.7、发明名称为“一种无线充电装置、电子设备及无线充电控制方法”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
本申请涉及终端技术领域，尤其涉及一种无线充电装置、电子设备及无线充电控制方法。
背景技术
无线充电，又称作感应充电、非接触式感应充电，是无线充电装置将能量发送至电子设备，该电子设备使用接收到的能量对自身的电池进行充电的充电方式。无线充电时，无线充电装置和电子设备之间不需使用实体的线缆连接。
无线充电装置包括功率发射线圈，用于将交变电流转换为交变磁场以对外传输能量。电子设备包括功率接收线圈，用于将接收到的交变磁场转换为交流电。也即目前功率发射线圈与功率接收线圈之间通过磁场耦合传输能量。随着技术的不断发展，无线充电的功率日渐增大，当功率发射线圈与功率接收线圈之间存在金属异物时，由于涡流效应，金属异物会发热，温度的上升导致存在烫伤风险，很容易产生安全隐患，并且会导致无线充电的效率显著下降，延长无线充电的用时。
目前的无线充电方案当检测到存在金属异物时，一般通过降低无线充电装置的发射功率来降低金属异物的发热，但是降低发射功率会使得电子设备的充电时间延长，进而降低了用户的体验。
发明内容
为了解决上述问题，本申请提供了一种无线充电装置、电子设备及无线充电控制方法，使得当发射线圈和接收线圈之间存在金属异物时，无线充电的效率得到提升，进而减少了无线充电的用时，提升了用户体验。
第一方面，本申请提供了一种无线充电装置，用于对电子设备进行无线充电，无线充电装置包括：逆变器、发射端谐振电路和发射端控制器。其中，逆变器用于将直流电转换为交流电后传输至发射端谐振电路；发射端谐振电路包括串联连接的发射端谐振电容和功率发射线圈；发射端控制器用于获取发射端谐振电路的当前品质因数，以及当利用当前品质因数确定无线充电装置与电子设备之间存在金属异物时，增大逆变器的工作频率。
利用本申请提供的方案，当利用发射端谐振电路的当前品质因数确定无线充电装置与电子设备之间存在金属异物时，控制无线充电装置的逆变器的工作频率增大，通过增大逆变器的工作频率，能够提升无线充电的效率。而目前检测到金属异物后，降低无线充电装置的发射功率的方案，会延长无线充电的时间。因此本申请的技术方案，相较于现有方案，在相同的发射功率的前提下，由于本申请方案的效率更高，因此减少了无线充电的用时， 提升了用户体验。
在一种可能的实现方式中，发射端控制器，具体用于根据当前逆变器的工作频率，和预先标定的逆变器的工作频率与品质因数的对应关系，确定品质因数的参考值；当品质因数的参考值与当前品质因数的差值大于预设阈值时，确定无线充电装置与电子设备之间存在金属异物。
在一种可能的实现方式中，发射端控制器，具体用于根据当前品质因数，以及预先标定的逆变器的目标工作频率和当前品质因数的对应关系，确定逆变器的目标工作频率，并控制逆变器工作在目标工作频率，目标工作频率大于当前工作频率。
在一种可能的实现方式中，发射端控制器，具体用于确定功率损耗值，根据功率损耗值，以及预先标定的逆变器的目标工作频率和功率损耗值的对应关系，确定逆变器的目标工作频率，并控制逆变器工作在目标工作频率，目标工作频率大于当前工作频率。
在一种可能的实现方式中，无线充电装置还包括：发射端收发器。发射端收发器，用于接收电子设备发送的输出功率信息，并将输出功率信息发送至发射端控制器，输出功率信息指示电子设备的整流器的输出功率。发射端控制器，具体用于根据无线充电装置的输入功率和输出功率信息，确定功率损耗值。
在一种可能的实现方式中，无线充电装置还包括：发射端收发器。发射端收发器，用于向电子设备发送输入功率信息，接收电子设备发送的功率损耗信息，并将功率损耗信息发送至发射端控制器，输入功率信息指示无线充电装置的输入功率，功率损耗信息指示功率损耗值；发射端控制器，具体用于根据功率损耗信息确定功率损耗值。
在一种可能的实现方式中，无线充电装置还包括：发射端收发器。发射端收发器，用于向电子设备发送输入功率信息，接收电子设备发送的第一参数信息，并将第一参数信息发送至发射端控制器，输入功率信息指示无线充电装置的输入功率，第一参数信息指示逆变器的目标工作频率；发射端控制器，具体用于根据第一参数信息确定功率损耗值。
在一种可能的实现方式中，无线充电装置还包括：发射端收发器；发射端收发器，用于向电子设备发送第二参数信息，第二参数信息用于指示当前品质因数，接收电子设备发送的第三参数信息并将第三参数信息发送至发射端控制器，第三参数信息用于指示逆变器的目标工作频率，目标工作频率大于当前工作频率；发射端控制器，用于根据第三参数信息确定逆变器的目标工作频率。
在一种可能的实现方式中，无线充电装置还包括检测电路。检测电路，用于获取发射端谐振电路的电压信号，并将电压信号转换为数字方波信号；发射端控制器，用于接收数字方波信号，并根据数字方波信号获取阻尼振荡的谐振电压衰减波形，并根据谐振电压衰减波形确定当前品质因数。
第二方面，本申请还提供的一种电子设备，该电子设备包括：接收端谐振电路、整流器、接收端控制器和接收端收发器。其中，所述接收端谐振电路包括串联连接的接收端谐振电容和功率接收线圈；所述整流器，用于将所述接收端谐振电路输出的交流电转换为直流电；所述接收端控制器，用于确定参数信息，并将所述参数信息通过所述接收端收发器发送至所述无线充电装置，以使所述无线充电装置根据所述参数信息确定逆变器的目标工作频率。
利用本申请提供的方案，当无线充电装置与电子设备之间存在金属异物时，控制无线充电装置的逆变器的工作频率增大，通过增大逆变器的工作频率，能够提升无线充电的效率。而目前检测到金属异物后，降低无线充电装置的发射功率的方案，会延长无线充电的时间。因此本申请的技术方案，相较于现有方案，在相同的发射功率的前提下，由于本申请方案的效率更高，因此减少了无线充电的用时，提升了用户体验。
在一种可能的实现方式中，参数信息为整流器的输出功率；
接收端控制器，具体用于根据整流器的输出电压和输出电流，确定整流器的输出功率；
接收端收发器，用于向无线充电装置发送输出功率信息，输出功率信息用于指示电子设备的整流器的输出功率。
在一种可能的实现方式中，参数信息为功率损耗值；
接收端控制器，用于根据整流器的输出电压和输出电流，确定整流器的输出功率；根据整流器的输出功率和接收端收发器发送的输入功率信息，确定功率损耗值，输入功率信息指示无线充电装置的输入功率；
接收端收发器，用于接收无线充电装置发送的输入功率信息，将输入功率信息发送至接收端控制器，以及向无线充电装置发送功率损耗信息，功率损耗信息用于指示功率损耗值。
在一种可能的实现方式中，参数信息为逆变器的目标工作频率；
接收端控制器，用于根据整流器的输出电压和输出电流，确定整流器的输出功率；根据整流器的输出功率和接收端收发器发送的输入功率信息，确定功率损耗值；并根据功率损耗值，以及预先标定的功率损耗值和逆变器的目标工作频率的对应关系，确定逆变器的目标工作频率，输入功率信息指示无线充电装置的输入功率；
接收端收发器，用于接收无线充电装置发送的输入功率信息，将输入功率信息发送至接收端控制器，以及向无线充电装置发送第一参数信息，第一参数信息用于指示逆变器的目标工作频率。
在一种可能的实现方式中，参数信息为逆变器的目标工作频率；
接收端控制器，用于根据接收端收发器发送的第二参数信息，以及预先标定的当前品质因数与逆变器的目标工作频率之间的对应关系，确定逆变器的目标工作频率，第二参数信息用于指示当前品质因数，目标工作频率大于当前工作频率；
接收端收发器，用于接收无线充电装置发送的第二参数信息，将第二参数信息发送至接收端控制器，以及向无线充电装置发送第三参数信息，第三参数信息用于指示逆变器的目标工作频率。
第三方面，本申请还提供了一种无线充电控制方法，该方法应用于无线充电装置，无线充电装置用于对电子设备进行无线充电，该方法包括以下步骤：
获取发射端谐振电路的当前品质因数；
当利用当前品质因数确定无线充电装置与电子设备之间存在金属异物时，增大逆变器的工作频率。
利用本申请提供的方法，当利用发射端谐振电路的当前品质因数确定无线充电装置与电子设备之间存在金属异物时，控制无线充电装置的逆变器的工作频率增大，通过增大逆 变器的工作频率，能够提升无线充电的效率。相较于现有方案，在相同的发射功率的前提下，由于本申请方案的效率更高，因此减少了无线充电的用时，提升了用户体验。
在一种可能的实现方式中，当利用当前品质因数确定无线充电装置与电子设备之间存在金属异物时，增大逆变器的工作频率，具体包括：
根据当前逆变器的工作频率，和预先标定的逆变器的工作频率与品质因数的对应关系，确定品质因数的参考值；
当品质因数的参考值与当前品质因数的差值大于预设阈值时，确定无线充电装置与电子设备之间存在金属异物；
增大逆变器的工作频率。
在一种可能的实现方式中，增大逆变器的工作频率，具体包括：
根据逆变器的当前品质因数，以及预先标定的逆变器的目标工作频率和当前品质因数的对应关系，确定逆变器的目标工作频率，目标工作频率大于当前工作频率；
控制逆变器工作在目标工作频率。
在一种可能的实现方式中，增大逆变器的工作频率，具体包括：
确定功率损耗值；
根据功率损耗值，以及预先标定的逆变器的目标工作频率和功率损耗值的对应关系，确定逆变器的目标工作频率，目标工作频率大于当前工作频率；
控制逆变器工作在目标工作频率。
在一种可能的实现方式中，确定功率损耗值，具体包括：
接收电子设备发送的输出功率信息，输出功率信息指示电子设备的整流器的输出功率；
根据无线充电装置的输入功率和输出功率信息，确定功率损耗值。
在一种可能的实现方式中，确定功率损耗值，具体包括：
向电子设备发送输入功率信息，输入功率信息指示无线充电装置的输入功率；
接收电子设备发送的功率损耗信息，功率损耗信息指示功率损耗值；
根据功率损耗信息确定功率损耗值。
在一种可能的实现方式中，确定功率损耗值，具体包括：
向电子设备发送输入功率信息，输入功率信息指示无线充电装置的输入功率；
接收电子设备发送的第一参数信息，第一参数信息指示逆变器的目标工作频率；
根据第一参数信息确定功率损耗值。
在一种可能的实现方式中，增大逆变器的工作频率具体包括：
向电子设备发送第二参数信息，第二参数信息用于指示当前品质因数；
接收电子设备发送的第三参数信息，第三参数信息用于指示逆变器的目标工作频率，目标工作频率大于当前工作频率；
根据第三参数信息确定逆变器的目标工作频率。
第四方面，本申请还提供的一种无线充电控制方法，该方法应用于电子设备，该方法包括：
确定参数信息，并将参数信息通过接收端收发器发送至无线充电装置，以使无线充电装置根据参数信息确定逆变器的目标工作频率，逆变器的目标工作频率大于逆变器的当前 工作频率。
利用该方法，当无线充电装置与电子设备之间存在金属异物时，控制无线充电装置的逆变器的工作频率增大，通过增大逆变器的工作频率，能够提升无线充电的效率。相较于现有方案，在相同的发射功率的前提下，由于本申请方案的效率更高，因此减少了无线充电的用时，提升了用户体验。
在一种可能的实现方式中，参数信息为电子设备的整流器的输出功率，确定参数信息，并将参数信息通过接收端收发器发送至无线充电装置，具体包括：
根据整流器的输出电压和输出电流，确定整流器的输出功率；
向无线充电装置发送输出功率信息，输出功率信息指示电子设备的整流器的输出功率。
在一种可能的实现方式中，参数信息为功率损耗值，确定参数信息，并将参数信息通过接收端收发器发送至无线充电装置，具体包括：接收无线充电装置发送的输入功率信息，输入功率信息指示无线充电装置的输入功率；
根据整流器的输出电压和输出电流，确定整流器的输出功率；
根据整流器的输出功率和输入功率信息，确定功率损耗值；
向无线充电装置发送功率损耗信息，功率损耗信息指示功率损耗值。
在一种可能的实现方式中，参数信息为逆变器的目标工作频率，确定参数信息，并将参数信息通过接收端收发器发送至无线充电装置，具体包括：
接收无线充电装置发送的输入功率信息，输入功率信息指示无线充电装置的输入功率；
根据整流器的输出电压和输出电流，确定整流器的输出功率；
根据整流器的输出功率和接收端收发器发送的输入功率信息，确定功率损耗值；
根据功率损耗值，以及预先标定的功率损耗值和逆变器的目标工作频率的对应关系，确定逆变器的目标工作频率；
向无线充电装置发送第一参数信息，第一参数信息指示逆变器的目标工作频率。
在一种可能的实现方式中，参数信息为逆变器的目标工作频率，确定参数信息，并将参数信息通过接收端收发器发送至无线充电装置，具体包括：
接收无线充电装置发送的第二参数信息，第二参数信息用于指示无线充电装置的发射端谐振电路的当前品质因数；
根据接收端收发器发送的第二参数信息，以及预先标定的当前品质因数与逆变器的目标工作频率之间的对应关系，确定逆变器的目标工作频率，目标工作频率大于当前工作频率；
向无线充电装置发送第三参数信息，第三参数信息指示逆变器的目标工作频率。
附图说明
图1为一种电子设备的示意图；
图2为电子设备进行无线充电的示意图；
图3为无线充电系统的电路示意图；
图4为本申请提供的场景示意图一；
图5为本申请提供的场景示意图二；
图6为本申请提供的功率发射线圈工作时的磁力线分布的示意图；
图7为本申请提供的功率发射线圈和功率接收线圈之间存在金属异物时的磁力线分布示意图；
图8为本申请提供的功率发射线圈和功率接收线圈之间存在金属异物时的金属异物上的涡流分布示意图；
图9为本申请提供的功率发射线圈和功率接收线圈之间存在金属异物时的金属异物上的涡流导致的金属异物温度升高的温度分布示意图；
图10为本申请提供的无线充电过程中金属异物上的能量分布示意图；
图11为本申请实施例提供的一种无线充电系统的电路示意图；
图12为本申请实施例提供的另一种无线充电系统的示意图；
图13为本申请实施例提供的又一种无线充电系统的示意图；
图14为本申请实施例提供的再一种无线充电系统的示意图；
图15为本申请实施例提供的另一种无线充电系统的示意图；
图16为本申请实施例提供的又一种无线充电系统的示意图；
图17为本申请实施例提供的一种无线充电控制方法的流程图；
图18为本申请实施例提供的另一种无线充电控制方法的流程图；
图19为本申请实施例提供的又一种无线充电控制方法的流程图；
图20为本申请实施例提供的再一种无线充电控制方法的流程图；
图21为本申请实施例提供的另一种无线充电控制方法的流程图。
具体实施方式
为了使本技术领域的人员更清楚地理解本申请的方案，下面首先说明本申请技术方案的应用场景。
参见图1，该图为一种电子设备的示意图。
本申请实施例对电子设备的类型不作具体限定，电子设备可以是手机、笔记本电脑、可穿戴电子设备(例如智能手表)、平板电脑、增强现实(augmented reality，AR)设备、虚拟现实(virtual reality，VR)设备以及车载设备等。
电子设备10可以包括处理器11、音频模块12、扬声器121、受话器122、麦克风123、耳机接口124、通用串行总线(universal serial bus，USB)接口13、充电管理模块14、电源管理模块141、电池142、无线充电模块143、天线组1、天线组2、移动通信模块15、无线通信模块16，以及传感器模块17等。
可以理解的是，图1示意的结构并不构成对电子设备10的具体限定。电子设备10可以包括比图示更多或更少的部件，或者组合某些部件，或者拆分某些部件，或者不同的部件布置。图示的部件可以以硬件，软件或软件和硬件的组合实现。
处理器11可以包括一个或多个处理单元，例如：处理器11可以包括应用处理器(application processor，AP)，调制解调处理器，图形处理器(graphics processing unit，GPU)，图像信号处理器(image signal processor，ISP)，控制器，视频编解码器，数字信号处理器(digital signal processor，DSP)，基带处理器，和/或神经网络处理器(neural-network processing unit， NPU)等。其中，不同的处理单元可以是独立的器件，也可以集成在一个或多个处理器中。控制器可以根据指令操作码和时序信号，产生操作控制信号，完成取指令和执行指令的控制。
处理器110中还可以设置存储器，用于存储指令和数据。在一些实施例中，处理器110中的存储器为高速缓冲存储器。该存储器可以保存处理器110刚用过或循环使用的指令或数据。如果处理器110需要再次使用该指令或数据，可从所述存储器中直接调用。避免了重复存取，减少了处理器110的等待时间，因而提高了系统的效率。
USB接口13是符合USB标准规范的接口，具体可以是Mini USB接口，Micro USB接口，USB Type C接口等。USB接口13可以用于连接充电器为电子设备10充电，也可以用于电子设备10与外围设备之间传输数据。也可以用于连接耳机，通过耳机播放音频。该接口还可以用于连接其他电子设备，例如AR设备等。
可以理解的是，本发明实施例示意的各模块间的接口连接关系，只是示意性说明，并不构成对电子设备10的结构限定。在本申请另一些实施例中，电子设备10也可以采用上述实施例中不同的接口连接方式，或多种接口连接方式的组合。
充电管理模块14用于从充电器接收充电输入。其中，充电器可以是无线充电装置，也可以是有线充电器。
在一些有线充电的实施例中，充电管理模块14可以通过USB接口13接收有线充电器的充电输入。在一些无线充电的实施例中，充电管理模块14可以通过无线充电模块143的功率接收线圈将接收到的交变磁场转换为交流电。充电管理模块14为电池142充电的同时，还可以通过电源管理模块141为电子设备供电。
在另一些实施例中，电子设备该可以对其它电子设备进行无线充电，也即电子设备的无线充电线圈能够将交流电转换为交变磁场，待其它电子设备的无线充电线圈靠近时，其它电子设备的无线充电线圈将交变磁场转换为交流电，然后将交流电转换为直流电后为其它电子设备的电池充电。
电源管理模块141用于连接电池142，充电管理模块14与处理器11。电源管理模块141接收电池142和/或充电管理模块14的输入，为处理器11、移动通信模块15和无线通信模块16等供电。电源管理模块141还可以用于监测电池容量，电池循环次数，电池健康状态(漏电，阻抗)等参数。在其他一些实施例中，电源管理模块141也可以设置于处理器11中。在另一些实施例中，电源管理模块141和充电管理模块14也可以设置于同一个器件中。
音频模块12用于将数字音频信息转换成模拟音频信号输出，也用于将模拟音频输入转换为数字音频信号。音频模块12还可以用于对音频信号编码和解码。在一些实施例中，音频模块12可以设置于处理器11中，或将音频模块12的部分功能模块设置于处理器11中。用于为扬声器12供电的Smart PA可以集成在音频模块12中，或者单独设置，本申请不作具体限定。
下面结合图2和图3说明电子设备10进行无线充电的方式。其中，图2为电子设备10进行无线充电的示意图；图3为无线充电系统的电路示意图。
图中以电子设备10为手机为例。电子设备10在进行无线充电时，无线充电装置20支 撑电子设备10水平放置。在另一些实施例中，无线充电装置20还可以具备其它形态，例如无线充电装置20可以为立式无线充电器，其具备一定的倾斜度，以使电子设备10可以倚靠且贴紧无线充电装置20。
如图3所示，无线充电装置可以包括无线功率发射端200，无线功率发射端200可以包括：逆变器201、发射端控制器202、发射端收发器203以及发射端谐振电路。其中，发射端谐振可以电路包括发射端谐振电容C1和功率发射线圈L1。
逆变器201可以用于将直流电转换为交流电后传输至发射端谐振电路。
发射端控制器202可以用于控制逆变器201的工作状态。
发射端收发器203可以是无线功率发射端的通讯单元。
功率发射线圈L1可以用于将交变电流转换为交变磁场以对外传输能量。
电子设备10可以包括无线功率接收端100，无线功率接收端100可以包括：整流器101、接收端控制器102、接收端收发器103以及接收端谐振电路。其中，接收端谐振电路可以包括接收端谐振电容C2和功率接收线圈L2。
功率接收线圈L2可以用于将接收到的交变磁场转换为交流电。
整流器101可以用于将交流电转换为直流电，并输出至充电电路400，以使充电电路400对电池142进行充电。充电电路400可以集成于图1中的充电管理模块14中。
接收端控制器102可以用于控制整流器101。
接收端收发器103可以是无线功率接收端的通讯单元。
充电电路400可以为直流(Direct Current，DC)/直流变换电路，例如升压(Boost)电路、降压(Buck)电路或升降压(Buck-Boost)电路等，本申请实施例不作具体限定。
无线功率发射端200和无线功率接收端100之间进行功率传输时，还进行通信。通信采用的调制方式为负载调制方式，也即无线功率接收端100将需要传输的数据调制到功率载波上，无线功率发射端200通过采样功率发射线圈L1的电流或者电压波形，解调负载的变化，进而接收数据。
具体的，无线功率接收端100需发送的通信信息，可以包括但不限于如用于进行身份认证识别的信息，以及用于指示进行能量传输时的要求的信息。接收端控制器102可以通过集成的低压差线性稳压器(low dropout regulator，LDO)来进行负载控制，更改LDO的阻抗，此操作将导致L2电流或线圈电压周期性变化，无线功率发射端200通过检测L1电流或电压的变化，解调出交流负载的各种通信信息，根据无线功率接收端100的请求调整输出功率。
无线功率发射端200可以通过频移键控(Frequency-shift keying，FSK)调制与无线功率接收端100进行通信。也即，无线功率发射端200可以通过往复增大/减小功率载波的频率，使无线功率接收端100接收到的功率载波的频率呈现波动状态，当这种波动满足特定的规律时，就可以传递信息。
无线功率接收端100可以通过幅移键控(Amplitude-shift keying，ASK)调制与无线功率发射端200进行通信。也即，无线功率接收端100可以通过改变自身谐振腔参数，改变所传递的功率载波的振幅，引起L1的电压或输入电流产生规律性的波动，从而传递通信信息。
无线功率发射端200与无线功率接收端100之间可以传输控制信号或者传输充电数据。 传输控制信号或者传输充电数据可以通过带内通讯实现，也可以通过带外通讯实现。无线功率发射端200与无线功率接收端100之间可以通过蓝牙(Bluetooth)、无线宽带(Wi-Fi)、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)等带外通讯方式实现无线连接。
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，充电协议可以是例如BPP(Basic Power Profile)协议，或者是EPP(Extended Power Profile)协议等。
接下来参见图4和图5。其中，图4为本申请提供的场景示意图一；图5为本申请提供的场景示意图二。
以电子设备10为手机为例，对于目前支持无线充电的手机而言，可能存在以下场景：
参见图4，随着手机摄像模组的功能日渐强大，应用于不同拍摄场景的摄像头(包括但不限于广角摄像头、超广角摄像头、光学变焦摄像头以及潜望式长焦摄像头等)的数量增多，摄像模组在手机上占据的空间越来越大。可能在摄像模组对应的外壳处设置金属部件来保护摄像模组，但是随着摄像模组的变大，部分金属部件41可能重叠在功率接收线圈(其轮廓由图4中的虚线圆圈表示)之上，该金属部件例如可以为铝片。
参见图5，用户在手机背部粘贴固定了饰品51，饰品51可以起到支架的作用，或者仅用于美观。饰品51可以固定在手机后盖上也可以固定在手机壳上。饰品51可以是圆形的、条形的或其他形状的。饰品51中包括有金属材料。
参见图6，图6为本申请提供的功率发射线圈工作时的磁力线分布的示意图。
图6下方的线圈为功率发射线圈L1，图6中示出了电流方向为逆时针方向时的磁场分布情况，上方的圆环代表外壳处的金属异物，也即图4中的金属部件41或者图5中的饰品51。
参见图7至图10。其中，图7为本申请提供的功率发射线圈和功率接收线圈之间存在金属异物时的磁力线分布示意图；图8为本申请提供的功率发射线圈和功率接收线圈之间存在金属异物时的金属异物上的涡流分布示意图；图9为本申请提供的功率发射线圈和功率接收线圈之间存在金属异物时的金属异物上的涡流导致的金属异物温度升高的温度分布的示意图；图10为本申请提供的无线充电过程中金属异物上的能量分布示意图。
其中，下方线圈为功率发射线圈L1，上方线圈为功率接收线圈L2。功率发射线圈L1与功率接收线圈L2之间通过磁场耦合传输能量，当金属异物41/51在无线充电过程中位于功率发射线圈L1与功率接收线圈L2之间时，由于涡流效应，金属异物41/51会发热，并且随着技术的不断发展，无线充电的功率日渐增大，导致涡流效应增强，金属异物41/51的发热就更显著，导致金属异物41/51温度会明显上升。
通常，对于图4的情况，用户一般无法对电子设备外壳进行改造以去除金属异物，而对于图5的情况，支架或饰品的粘贴部件往往是一次性部件，不能重复使用，因此电子设备在进行无线充电时，用户也不会取下支架或饰品。综上，具有上述金属异物的电子设备在进行无线充电时，无法去除金属异物，会导致金属异物持续发热，无线充电的效率显著 下降，同时也存在烫伤风险，很容易产生安全隐患。
目前的发热控制方案一般是通过降低无线充电装置的发射功率来降低金属异物的发热，但是降低发射功率会使得电子设备的充电时间延长。此外，若电子设备具备无线快充功能，降低发射功率还会导致无法保持快充状态，降低了用户的体验。
为了解决以上技术问题，本申请提供了一种无线充电装置、电子设备及无线充电控制方法，当发射线圈和接收线圈之间存在金属异物时，通过提升无线充电装置中的逆变器的工作频率，来提升无线充电的效率，进而相对减少无线充电的用时，提升了用户体验。
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。
本申请说明中的“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。
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；可以是直接连接，也可以通过中间媒介间接连接。
在本申请实施例中，“示例性的”或者“例如”等词用于表示作例子、例证或说明。本申请实施例中被描述为“示例性的”或者“例如”的任何实施例或设计方案不应被解释为比其它实施例或设计方案更优选或更具优势。
参见图11，该图为本申请实施例提供的一种无线充电系统的电路示意图。
图示无线充电系统可以包括无线充电装置20和电子设备10。
其中，无线充电装置20可以包括逆变器201、发射端谐振电路和发射端控制器202。
发射端谐振电路包括串联连接的发射端谐振电容C1和功率发射线圈L1。
逆变器201将电源30输入的直流电转换为交流电后传输至发射端谐振电路。电源30可以为无线充电装置20的电源适配器。电源适配器将外部连接的交流电转换为直流电后提供给逆变器201。
电子设备10可以包括接收端谐振电路、整流器101和接收端控制器102。
其中，接收端谐振电路包括串联连接的接收端谐振电容C2和功率接收线圈L2。
整流器101用于将接收端谐振电路输出的交流电转换为直流电。
目前，金属异物的检测方法，通常包括Ploss(Power loss，功率损耗)检测法和Q值法。
其中，Ploss检测法需要获得无线功率发射端的输入功率，然后根据无线功率发射端的输入功率和无线功率接收端的输出功率获得功率损耗，当功率损耗大于功率阈值时，确定无线功率发射端和无线功率接收端之间存在金属异物。
Q值也即品质因数，或者品质因子，是物理及工程中的无量纲参数，是表示振子阻尼性质的物理量，Q值较大表示振子能量损失的速率较慢，振动可持续较长的时间，也即该充电电路同周期的损耗越小，性能越佳。
Q值的检测由无线功率发射端实现，Q值满足下式：
其中，L1为功率发射线圈的电感值，Rtx为功率发射线圈的交流阻抗，f为无线充电装置的谐振网络的谐振频率。
从公式(1)可以看出，Q值大小与功率发射线圈的交流阻抗Rtx成反比，当功率发射线圈与功率接收线圈之间存在金属异物时，Rtx增大，会导致Q值下降。通过确定Q值，当发现Q值异常下降时，即Rtx增大，也即确定出了无线功率发射端和无线功率接收端之间存在金属异物。
本申请实施例中的发射端控制器202，用于获取发射端谐振电路的当前品质因数Q0，当利用当前品质因数Q0确定无线充电装置20与电子设备10之间存在金属异物时，增大逆变器201的工作频率，以提升无线充电装置的充电效率，减少充电时间，提升用户体验。
下面结合测试数据说明本申请技术方案的技术效果。
实验测试时，无线充电装置20的功率发射线圈L1的电感为5.7微亨(uH)，等效串联电阻(Equivalent Series Resistance，RSR)为77毫欧姆(mΩ)，直流电阻为47mΩ。
电子设备10的功率接收线圈L2的电感为7.6微亨(uH)，等效串联电阻为232毫欧姆(mΩ)，直流电阻为196mΩ。
逆变器201的输入电流为Iin，逆变器201的输入电压为Vin，逆变器的当前工作频率为Fop。
整流器101的输出电流为Iout，整流器101的输出电压为Vout。
测试结果如下列各表所述，其中，线圈距离值功率发射线圈L1所在的平面和功率接收线圈L2所在的平面之间的距离：
表1：低频且金属异物有磁性时的测试数据
表2：高频且金属异物有磁性时的测试数据
对比以上表1和表2可以看出，当金属异物无磁性时，逆变器的工作频率为高频时无线充电的效率，高于逆变器的工作频率为低频时无线充电的效率，也即随着逆变器的当前工作频率的提升，无线充电的效率提升。
表3和表4列出了金属异物无磁性时，逆变器的工作频率分别为高频和低频时的测试结果。
表3：低频且金属异物无磁性时的测试数据
表4：高频且金属异物无磁性时的测试数据
对比以上表3和表4可以看出，当金属异物有磁性时，逆变器的工作频率为高频时无线充电的效率，高于逆变器的工作频率为低频时无线充电的效率，也即随着逆变器的当前工作频率的提升，无线充电的效率提升。
综合以上的表1至表4，可以得到以下的数据表。其中，η(有磁)表示金属异物有磁性时的充电效率；η(无磁)表示金属异物无磁性时的充电效率；η(无磁-有磁)表示金属异物无磁性时的充电效率与金属异物有磁性时的充电效率之差。
表5：效率与金属异物有无磁性的关系表
结合表5可以确定，当金属异物有磁性时，在高频和低频的情况下，无线充电的效率均较低，也即具有磁性的金属异物能够使无线充电的效率降低更多。
表6：效率与逆变器的当前工作频率的关系表
结合表6可以确定，无论金属异物是否具有磁性，通过提升逆变器的当前工作频率，均能够提升无线充电的效率，并且当金属异物具有磁性时，对充电效率的提升效率更加显著。
综上所述，利用本申请实施例提供的技术方案，利用发射端谐振电路的当前品质因数确定无线充电装置与所述电子设备之间存在金属异物时，通过增大逆变器的工作频率，能够提升无线充电的效率，进而减少无线充电的用时，提升了用户体验。也即相较于现有技术中单纯降低无线充电装置输入功率的方案，在相同的发射功率下，由于本申请方案的效率更高，因此减少了无线充电的用时，提升了用户体验。
下面结合具体的实现方式进行说明。
参见图12，该图为本申请实施例提供的另一种无线充电系统的示意图。
图示电子设备的逆变器201为全桥逆变器，包括第一桥臂和第二桥臂，第一桥臂包括串联连接的可控开关S1和可控开关S2，第二桥臂包括串联连接的可控开关S3和可控开关S4。第一桥臂的中点和第二桥臂的中点连接发射端谐振电路。
整流器101为全桥整流器，包括第一桥臂和第二桥臂，第一桥臂包括串联连接的可控开关Q1和可控开关Q2，第二桥臂包括串联连接的可控开关Q3和可控开关Q4。第一桥臂的中点和第二桥臂的中点连接接收端谐振电路。
其中，可控开关S1至S4，以及可控开关Q1至Q4的类型可以为以下任意一种：绝缘栅双极型晶体管(Insulated Gate Bipolar Transistor，IGBT)或金属氧化物半导体场效应晶体管(Metal Oxide Semiconductor Filed Effect Transistor，MOSFET，以下简称MOS管)、碳化硅场效应管(Silicon Carbide Metal Oxide Semiconductor，SiC MOSFET)等。以下说明中以可控 开关均为MOS管为例进行说明，其中，开关为MOS管时，开关的第一端为漏极，开关的第二端为源极，开关的控制端为栅极，发射端与接收端的控制器通过与可控开关的栅极连接，向开关发出控制信号，进而切换开关的通断状态。在一种典型的实现方式中，控制信号为电平信号，开关为NMOS管时，当开关的控制端连接高电平时开关导通，当开关的控制端连接低电平时开关关断。
发射端控制器202和接收端控制器101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)、数字信号处理器(Digital Signal Processor，DSP)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。
下面首先说明无线充电装置确定发射端谐振电路的当前品质因数的实现方式。
无线充电装置20的检测电路获取发射端谐振电路的电压信号，并将电压信号转换为数字方波信号，将数字方波信号传输至发射端控制器202。
发射端控制器202接收数字方波信号，并根据数字方波信号获取阻尼振荡的谐振电压衰减波形，并根据谐振电压衰减波形确定当前品质因数Q0。
发射端控制器202可以根据可控开关S1至S4的导通和关断状态获取阻尼振荡的谐振电压衰减波形。当发射端谐振电路的相位中点对地电压达到激励电压源的幅值电压时，发生阻尼振荡并产生谐振电压。发射端控制器202获取谐振电压衰减波形中满足第一条件的第一参数，并根据第一参数确定当前品质因数Q0。
预设条件为在振荡周期内，阻尼振荡产生的谐振电压大于参考电压。
第一参数可以为波峰数、波谷数，或者波峰数和波谷数的总和。
其中，波峰数为S1断开，S3导通，S2由导通变成关断，S4由关断变成导通的情况下，满足预设条件的波峰个数。
波谷数为S2断开，S4导通，S1由导通变成关断，S2由关断变成导通的情况下，满足预设条件的波谷个数。
波峰数和波谷数的总和为满足预设条件的波峰数和满足预设条件的波谷数的总和。
当第一参数为波峰数或波谷数时，当前品质因数Q0为：
其中，式(2)中的n为波峰数或波谷数，U1和U2为谐振电压衰减波形中的任一周期的波峰电压和波谷电压。
当第一参数为波峰数和波谷数的总和时，当前品质因数Q0为：
其中，式(3)中的n为波峰数和波谷数的总和。
以上仅为确定当前品质因数Q0的一种可能的实现方式，实际应用中，无线功率的发射端还可以采用其它的实现方式确定当前品质因数Q0，本申请实施例不再赘述，可以理解是，目前确定当前品质因数Q0的技术较为成熟，其它可能的技术方案也可以应用于本申请中。
发射端控制器202当前逆变器201的工作频率，和预先标定的逆变器的工作频率与品质因数的对应关系，确定所述品质因数的参考值Qr。当品质因数的参考值Qr与当前品质因数Q0之间的差值大于预设阈值时，确定无线充电装置与电子设备之间存在金属异物。
本申请实施例对预设阈值不作具体限定，可以通过实验测试预先标定预设阈值的取值。
在一些实施例中，逆变器的工作频率与品质因数的对应关系可以提过测试进行标定，并以数据表的形式进行存储。
发射端控制器202当确定所述无线充电装置201与所述电子设备101之间存在金属异物时，增大逆变器201的工作频率。也即使逆变器201工作在目标工作频率，目标工作频率大于当前工作频率。
下面说明无线充电装置控制逆变器201的工作在目标工作频率的实现方式。
在一种可能的实现方式中，发射端控制器201用于根据逆变器201的当前品质因数Q0，以及逆变器的目标工作频率和当前品质因数的对应关系，确定逆变器的目标工作频率。其中，逆变器的目标工作频率和当前品质因数的对应关系可以预先标定并以数据表的形式进行存储，当确定存在异物时，根据当前品质因数Q0通过查表法获取对应的目标工作频率。然后发射端控制器201控制逆变器201工作在目标工作频率。
在另一种可能的实现方式中，发射端控制器201确定功率损耗值，根据功率损耗值(Ploss)，以及逆变器201的目标工作频率和Ploss的对应关系，确定逆变器201的目标工作频率。目标工作频率和Ploss的对应关系可以预先标定并以数据表的形式进行存储，当确定存在金属异物时，根据Ploss通过查表法获取对应的目标工作频率。然后发射端控制器201控制所述逆变器工作在所述目标工作频率。
其中，Ploss为逆变器201的输入功率与整流器101的输出功率的差值。下面说明确定Ploss的实现方式。
接收端控制器102用于确定参数信息，并将参数信息通过接收端收发器103发送至所述无线充电装置，以使无线充电装置根据参数信息确定Ploss，进而确定逆变器的目标工作频率，逆变器的目标工作频率大于逆变器的当前工作频率。
下面说明第一种确定Ploss的实现方式。
参见图13，该图为本申请实施例提供的又一种无线充电系统的示意图。
此时接收端控制器102确定的参数信息为整流器101的输出功率。其中，接收端控制器102根据整流器101的输出电压Vout和输出电流Iin，确定整流器的输出功率Pout。接收端收发器103向发射端收发器203发送输出功率信息，该输出功率信息指示电子设备的整流器101的输出功率Pout。
发射端收发器203接收输出功率信息，并将输出功率信息发送至发射端控制器202。
发射端控制器202根据逆变器201的输入电压Vin和输入电流Iin，确定逆变器201的输入功率Pin，并获取输入功率Pin与输出功率Pout的差值，即为Ploss。
下面说明另一种确定Ploss的实现方式。
参见图14，该图为本申请实施例提供的再一种无线充电系统的示意图。
其中，发射端控制器202根据逆变器201的输入电压Vin和输入电流Iin，确定逆变器201的输入功率Pin。
发射端收发器203向电子设备的接收端收发器103发送输入功率信息，该输入功率信息指示无线充电装置的输入功率Pin。
接收端控制器102根据整流器101的输出电压Vout和输出电流Iin，确定整流器的输出功率Pout。
接收端收发器103接收输入功率信息，并将该输入功率信息发送至接收端控制器102。
接收端控制器102获取输入功率Pin与输出功率Pout的差值，即为Ploss。
接收端收发器103向发射端收发器203发送功率损耗信息，功率损耗信息指示功率损耗值Ploss。
发射端收发器203接收功率损耗信息，并将功率损耗信息发送至发射端控制器202，以使发射端控制器202获取Ploss。
下面说明先由电子设备确定逆变器的目标工作频率，然后告知发射端控制器202的实现方式。
下面首先说明第一种由电子设备确定逆变器的目标工作频率的实现方式。
参见图15，该图为本申请实施例提供的另一种无线充电系统的示意图。
其中，发射端控制器202根据逆变器201的输入电压Vin和输入电流Iin，确定逆变器201的输入功率Pin。
发射端收发器203向电子设备的接收端收发器103发送输入功率信息，输入功率信息指示无线充电装置的输入功率Pin。
接收端控制器102根据整流器101的输出电压Vout和输出电流Iin，确定整流器的输出功率Pout。接收端收发器103接收输入功率信息，并将该输入功率信息发送至接收端控制器102。
接收端控制器102获取输入功率Pin与输出功率Pout的差值，即为Ploss。接收端控制器102根据Ploss，以及Ploss和逆变器的目标工作频率的对应关系，确定逆变器201的目标工作频率ft。其中，Ploss和逆变器的目标工作频率的对应关系可以预先标定并以数据表的形式进行存储。
接收端收发器103向发射端收发器203发送第一参数信息，第一参数信息指示逆变器201的目标工作频率ft。
发射端收发器203接收第一参数信息，并将第一参数信息发送至发射端控制器202，以使发射端控制器202获取ft。
下面首先说明另一种由电子设备确定逆变器的目标工作频率的实现方式。
参见图16，该图为本申请实施例提供的又一种无线充电系统的示意图。
发射端控制器202确定当前品质因数Q0后，发射端收发器203向电子设备的接收端收发器103发送第二参数信息，第二参数信息用于指示所述当前品质因数Q0。
接收端收发器103接收第二参数信息，将第二参数信息发送至接收端控制器102。
接收端控制器102根据第二参数信息中携带的当前品质因数Q0，以及当前品质因数与逆变器的目标工作频率之间的对应关系，确定逆变器的目标工作频率ft。在一种可能的实现方式中，当前品质因数与逆变器的目标工作频率之间的对应关系预先标定并以数据表的显示进行存储。
接收端收发器103向发射端收发器203发送第三参数信息，第三参数信息指示逆变器201的目标工作频率ft。
发射端收发器203接收第三参数信息，并将第三参数信息发送至发射端控制器202，以使发射端控制器202获取逆变器201的目标工作频率ft。
综上所述，当无线充电装置利用发射端谐振电路的当前品质因数确定无线充电装置与所述电子设备之间存在金属异物时，利用以上实施例提供的方案，能够确定出逆变器的目标工作频率，该目标工作频率大于当前的工作频率，通过增大逆变器的工作频率，能够提升无线充电的效率，进而减少无线充电的用时，提升了用户体验。
基于以上实施例提供的无线充电装置和电子设备，本申请实施例还提供了一种无线充电控制方法，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控制方法的流程图。
该方法应用于无线充电装置，关于无线充电装置的具体实现方式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，该方法包括以下步骤:
S101：获取发射端谐振电路的当前品质因数。
无线充电装置获取当前品质因数的方式为较为成熟的技术，下面说明一种可能的实现方式。
根据可控开关S1至S4的导通和关断状态获取阻尼振荡的谐振电压衰减波形。当发射端谐振电路的相位中点对地电压达到激励电压源的幅值电压时，发生阻尼振荡并产生谐振电压。获取谐振电压衰减波形中满足第一条件的第一参数，并根据第一参数确定当前品质因数Q0。
预设条件为在振荡周期内，阻尼振荡产生的谐振电压大于参考电压。
第一参数可以为波峰数、波谷数，或者波峰数和波谷数的总和。
其中，波峰数为在S1断开，S3导通，S2由导通变成关断，S4由关断变成导通的情况下，满足预设条件的波峰个数。
波谷数为在S2断开，S4导通，S1由导通变成关断，S2由关断变成导通的情况下，满足预设条件的波谷个数。
波峰数和波谷数的总和为满足预设条件的波峰数和满足预设条件的波谷数的总和。
当第一参数为波峰数或波谷数时，当前品质因数Q0为：
其中，n为波峰数或波谷数，U1和U2为谐振电压衰减波形中的任一周期的波峰电压和波谷电压。
当第一参数为波峰数和波谷数的总和时，当前品质因数Q0为：
其中，n’为波峰数和波谷数的总和。
S102：当利用当前品质因数确定无线充电装置与电子设备之间存在金属异物时，增大逆变器的工作频率。
在一种可能的实现方式中，根据当前逆变器的工作频率，和预先标定的逆变器的工作频率与品质因数的对应关系，确定品质因数的参考值。当品质因数的参考值与当前品质因数的差值大于预设阈值时，确定无线充电装置与电子设备之间存在金属异物。
在一种可能的实现方式中，由无线充电装置确定逆变器的目标工作频率，目标工作频率大于当前的工作频率。无线充电装置根据逆变器的当前品质因数，以及预先标定的逆变器的目标工作频率和当前品质因数的对应关系，确定逆变器的目标工作频率，并控制逆变器工作在目标工作频率，以实现增大逆变器的工作频率。
在另一种可能的实现方式中，无线充电装置确定功率损耗值；根据功率损耗值，以及预先标定的逆变器的目标工作频率和功率损耗值的对应关系，确定逆变器的目标工作频率。然后控制逆变器工作在目标工作频率，以实现增大逆变器的工作频率。
利用本申请实施例提供的方法，利用发射端谐振电路的当前品质因数确定无线充电装置与所述电子设备之间存在金属异物时，通过增大逆变器的工作频率，能够提升无线充电的效率，进而避免无线充电时间延长，提升了用户体验。
下面结合具体的实现方式进行说明。
参见图18，该图为本申请实施例提供的另一种无线充电控制方法的流程图。
当利用当前品质因数确定无线充电装置与电子设备之间存在金属异物后，该方法包括以下步骤：
S201：根据整流器的输出电压Vout和输出电流Iin，确定整流器的输出功率Pout。
S202：向无线充电装置发送输出功率信息。
输出功率信息指示电子设备的整流器的输出功率Pout。
S203：根据逆变器的输入电压Vin和输入电流Iin，确定逆变器的输入功率Pin。
S204：根据输入功率Pin与输出功率Pout的差值，获取功率损耗值Ploss。
S205：根据功率损耗值Ploss，以及预先标定的逆变器的目标工作频率和功率损耗值的对应关系，确定逆变器的目标工作频率。
S206：控制逆变器工作在目标工作频率。
下面说明另一种无线充电控制方法的实现方式。
参见图19，该图为本申请实施例提供的又一种无线充电控制方法的流程图。
当利用当前品质因数确定无线充电装置与电子设备之间存在金属异物后，该方法包括以下步骤：
S301：根据逆变器的输入电压Vin和输入电流Iin，确定逆变器的输入功率Pin。
S302：向电子设备发送输入功率信息。
输入功率信息指示无线充电装置的输入功率Pin。
S303：根据整流器的输出电压Vout和输出电流Iout，确定整流器的输出功率Pout。
S304：根据输入功率Pin与输出功率Pout的差值，获取功率损耗值Ploss。
S305：向无线充电装置发送功率损耗信息。
功率损耗信息指示功率损耗值Ploss。
S306：根据功率损耗值Ploss，以及预先标定的逆变器的目标工作频率和功率损耗值的对应关系，确定逆变器的目标工作频率。
S307：控制逆变器工作在目标工作频率。
下面说明又一种无线充电控制方法的实现方式。
参见图20，该图为本申请实施例提供的再一种无线充电控制方法的流程图。
当利用当前品质因数确定无线充电装置与电子设备之间存在金属异物后，该方法包括以下步骤：
S401：根据逆变器的输入电压Vin和输入电流Iin，确定逆变器的输入功率Pin。
S402：向电子设备发送输入功率信息。
输入功率信息指示无线充电装置的输入功率Pin。
S403：根据整流器的输出电压Vout和输出电流Iout，确定整流器的输出功率Pout。
S404：根据输入功率Pin与输出功率Pout的差值，获取功率损耗值Ploss。
S405：根据功率损耗值Ploss，以及功率损耗值Ploss和逆变器的目标工作频率的对应关系，确定逆变器的目标工作频率ft。
S406：向电子设备发送第一参数信息。
第一参数信息指示逆变器的目标工作频率ft。
S407：接收第一参数信息，控制逆变器工作在目标工作频率ft。
下面说明再一种无线充电控制方法的实现方式。
参见图21，该图为本申请实施例提供的另一种无线充电控制方法的流程图。
当利用当前品质因数确定无线充电装置与电子设备之间存在金属异物后，该方法包括以下步骤：
S501：向电子设备发送第二参数信息。
第二参数信息用于指示当前品质因数Q0。
S502：根据第二参数信息中携带的当前品质因数Q0，以及当前品质因数与逆变器的目标工作频率之间的对应关系，确定逆变器的目标工作频率ft。
在一种可能的实现方式中，当前品质因数与逆变器的目标工作频率之间的对应关系预先标定并以数据表的显示进行存储。
S503：向无线充电装置发送第三参数信息。
第三参数信息指示逆变器的目标工作频率ft。
S504：接收第三参数信息，控制逆变器工作在目标工作频率ft。
本申请以上方法中的步骤顺序仅是为了方便说明，在能够解决本申请技术问题的前提下，本领域技术人员可以对以上步骤的顺序进行调整。
综上所述，利用本申请实施例提供的方法，当利用发射端谐振电路的当前品质因数确定无线充电装置与所述电子设备之间存在金属异物时，能够确定出逆变器的目标工作频率，该目标工作频率大于当前的工作频率，通过增大逆变器的工作频率，能够提升无线充电的效率，因此减少了无线充电的用时，提升了用户体验。也即相较于现有技术方案，在相同的发射功率下，由于本申请方案的效率更高，因此减少了无线充电的用时，提升了用户体验。
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，以上实施例仅用以说明本申请的技术方案，而非对其限制；尽管参照前述实施例对本申请进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本申请各实施例技术方案的精神和范围。

Claims (27)

  1. 一种无线充电装置，其特征在于，用于对电子设备进行无线充电，所述无线充电装置包括：逆变器、发射端谐振电路和发射端控制器；其中，
    所述逆变器用于将直流电转换为交流电后传输至所述发射端谐振电路；
    所述发射端谐振电路包括串联连接的发射端谐振电容和功率发射线圈；
    所述发射端控制器，用于获取所述发射端谐振电路的当前品质因数，以及当利用所述当前品质因数确定所述无线充电装置与所述电子设备之间存在金属异物时，增大所述逆变器的工作频率。
  2. 根据权利要求1所述的无线充电装置，其特征在于，所述发射端控制器，具体用于根据当前逆变器的工作频率，和预先标定的逆变器的工作频率与品质因数的对应关系，确定所述品质因数的参考值；当所述品质因数的参考值与所述当前品质因数的差值大于预设阈值时，确定所述无线充电装置与所述电子设备之间存在金属异物。
  3. 根据权利要求2所述的无线充电装置，其特征在于，所述发射端控制器，具体用于根据所述当前品质因数，以及预先标定的逆变器的目标工作频率和当前品质因数的对应关系，确定所述逆变器的目标工作频率，并控制所述逆变器工作在所述目标工作频率，所述目标工作频率大于所述当前工作频率。
  4. 根据权利要求2所述的无线充电装置，其特征在于，所述发射端控制器，具体用于确定功率损耗值，根据所述功率损耗值，以及预先标定的逆变器的目标工作频率和功率损耗值的对应关系，确定所述逆变器的目标工作频率，并控制所述逆变器工作在所述目标工作频率，所述目标工作频率大于所述当前工作频率。
  5. 根据权利要求4所述的无线充电装置，其特征在于，所述无线充电装置还包括：发射端收发器；
    所述发射端收发器，用于接收所述电子设备发送的输出功率信息，并将所述输出功率信息发送至所述发射端控制器，所述输出功率信息指示所述电子设备的整流器的输出功率；
    所述发射端控制器，具体用于根据所述无线充电装置的输入功率和所述输出功率信息，确定所述功率损耗值。
  6. 根据权利要求4所述的无线充电装置，其特征在于，所述无线充电装置还包括：发射端收发器；
    所述发射端收发器，用于向所述电子设备发送输入功率信息，接收所述电子设备发送的功率损耗信息，并将所述功率损耗信息发送至所述发射端控制器，所述输入功率信息指示所述无线充电装置的输入功率，所述功率损耗信息指示所述功率损耗值；
    所述发射端控制器，具体用于根据所述功率损耗信息确定所述功率损耗值。
  7. 根据权利要求2所述的无线充电装置，其特征在于，所述无线充电装置还包括：发射端收发器；
    所述发射端收发器，用于向所述电子设备发送输入功率信息，接收所述电子设备发送的第一参数信息，并将所述第一参数信息发送至所述发射端控制器，所述输入功率信息指示所述无线充电装置的输入功率，所述第一参数信息指示所述逆变器的目标工作频率；
    所述发射端控制器，具体用于根据所述第一参数信息确定所述功率损耗值。
  8. 根据权利要求2所述的无线充电装置，其特征在于，所述无线充电装置还包括：发射端收发器；
    所述发射端收发器，用于向所述电子设备发送第二参数信息，所述第二参数信息用于指示所述当前品质因数，接收所述电子设备发送的第三参数信息并将所述第三参数信息发送至所述发射端控制器，所述第三参数信息用于指示所述逆变器的目标工作频率，所述目标工作频率大于所述当前工作频率；
    所述发射端控制器，用于根据所述第三参数信息确定所述逆变器的目标工作频率。
  9. 根据权利要求1至8中任一项所述的无线充电装置，其特征在于，所述无线充电装置还包括检测电路：
    所述检测电路，用于获取所述发射端谐振电路的电压信号，并将所述电压信号转换为数字方波信号；
    所述发射端控制器，用于接收所述数字方波信号，并根据所述数字方波信号获取阻尼振荡的谐振电压衰减波形，并根据所述谐振电压衰减波形确定所述当前品质因数。
  10. 一种电子设备，所述电子设备包括：接收端谐振电路、整流器、接收端控制器和接收端收发器；
    所述接收端谐振电路包括串联连接的接收端谐振电容和功率接收线圈；
    所述整流器，用于将所述接收端谐振电路输出的交流电转换为直流电；
    所述接收端控制器，用于确定参数信息，并将所述参数信息通过所述接收端收发器发送至所述无线充电装置，以使所述无线充电装置根据所述参数信息确定逆变器的目标工作频率，所述逆变器的目标工作频率大于所述逆变器的当前工作频率。
  11. 根据权利要求10所述的电子设备，其特征在于，所述参数信息为所述整流器的输出功率；
    所述接收端控制器，具体用于根据所述整流器的输出电压和输出电流，确定所述整流器的输出功率；
    所述接收端收发器，用于向所述无线充电装置发送输出功率信息，所述输出功率信息用于指示所述电子设备的整流器的输出功率。
  12. 根据权利要求10所述的电子设备，其特征在于，所述参数信息为功率损耗值；
    所述接收端控制器，用于根据所述整流器的输出电压和输出电流，确定所述整流器的输出功率；根据所述整流器的输出功率和所述接收端收发器发送的输入功率信息，确定功率损耗值，所述输入功率信息指示所述无线充电装置的输入功率；
    所述接收端收发器，用于接收无线充电装置发送的输入功率信息，将所述输入功率信息发送至所述接收端控制器，以及向所述无线充电装置发送功率损耗信息，所述功率损耗信息用于指示所述功率损耗值。
  13. 根据权利要求10所述的电子设备，其特征在于，所述参数信息为所述逆变器的目标工作频率；
    所述接收端控制器，用于根据所述整流器的输出电压和输出电流，确定所述整流器的输出功率；根据所述整流器的输出功率和所述接收端收发器发送的输入功率信息，确定功率损耗值；并根据所述功率损耗值，以及预先标定的功率损耗值和逆变器的目标工作频率 的对应关系，确定所述逆变器的目标工作频率，所述输入功率信息指示所述无线充电装置的输入功率；
    所述接收端收发器，用于接收无线充电装置发送的输入功率信息，将所述输入功率信息发送至所述接收端控制器，以及向所述无线充电装置发送第一参数信息，所述第一参数信息用于指示所述逆变器的目标工作频率。
  14. 根据权利要求10所述的电子设备，其特征在于，所述参数信息为所述逆变器的目标工作频率；
    所述接收端控制器，用于根据所述接收端收发器发送的第二参数信息，以及预先标定的当前品质因数与逆变器的目标工作频率之间的对应关系，确定所述逆变器的目标工作频率，所述第二参数信息用于指示所述当前品质因数，所述目标工作频率大于所述当前工作频率；
    所述接收端收发器，用于接收无线充电装置发送的第二参数信息，将所述第二参数信息发送至所述接收端控制器，以及向所述无线充电装置发送第三参数信息，所述第三参数信息用于指示所述逆变器的目标工作频率。
  15. 一种无线充电控制方法，其特征在于，应用于无线充电装置，所述无线充电装置用于对电子设备进行无线充电，所述方法包括：
    获取所述发射端谐振电路的当前品质因数；
    当利用所述当前品质因数确定所述无线充电装置与所述电子设备之间存在金属异物时，增大所述逆变器的工作频率。
  16. 根据权利要求15所述的无线充电控制方法，其特征在于，所述当利用所述当前品质因数确定所述无线充电装置与所述电子设备之间存在金属异物时，增大所述逆变器的工作频率，具体包括：
    根据当前逆变器的工作频率，和预先标定的逆变器的工作频率与品质因数的对应关系，确定所述品质因数的参考值；
    当所述品质因数的参考值与所述当前品质因数的差值大于预设阈值时，确定所述无线充电装置与所述电子设备之间存在金属异物；
    增大所述逆变器的工作频率。
  17. 根据权利要求16所述的无线充电控制方法，其特征在于，所述增大所述逆变器的工作频率，具体包括：
    根据所述逆变器的当前品质因数，以及预先标定的逆变器的目标工作频率和当前品质因数的对应关系，确定所述逆变器的目标工作频率，所述目标工作频率大于所述当前工作频率；
    控制所述逆变器工作在所述目标工作频率。
  18. 根据权利要求16所述的无线充电控制方法，其特征在于，所述增大所述逆变器的工作频率，具体包括：
    确定功率损耗值；
    根据所述功率损耗值，以及预先标定的逆变器的目标工作频率和功率损耗值的对应关系，确定所述逆变器的目标工作频率，所述目标工作频率大于所述当前工作频率；
    控制所述逆变器工作在所述目标工作频率。
  19. 根据权利要求18所述的无线充电控制方法，其特征在于，所述确定功率损耗值，具体包括：
    接收所述电子设备发送的输出功率信息，所述输出功率信息指示所述电子设备的整流器的输出功率；
    根据所述无线充电装置的输入功率和所述输出功率信息，确定所述功率损耗值。
  20. 根据权利要求18所述的无线充电控制方法，其特征在于，所述确定功率损耗值，具体包括：
    向所述电子设备发送输入功率信息，所述输入功率信息指示所述无线充电装置的输入功率；
    接收所述电子设备发送的功率损耗信息，所述功率损耗信息指示所述功率损耗值；
    根据所述功率损耗信息确定所述功率损耗值。
  21. 根据权利要求16所述的无线充电控制方法，其特征在于，所述确定功率损耗值，具体包括：
    向所述电子设备发送输入功率信息，所述输入功率信息指示所述无线充电装置的输入功率；
    接收所述电子设备发送的第一参数信息，所述第一参数信息指示所述逆变器的目标工作频率；
    根据所述第一参数信息确定所述功率损耗值。
  22. 根据权利要求16所述的无线充电控制方法，其特征在于，所述增大所述逆变器的工作频率
    向所述电子设备发送第二参数信息，所述第二参数信息用于指示所述当前品质因数；
    接收所述电子设备发送的第三参数信息，所述第三参数信息用于指示所述逆变器的目标工作频率，所述目标工作频率大于所述当前工作频率；
    根据所述第三参数信息确定所述逆变器的目标工作频率。
  23. 一种无线充电控制方法，其特征在于，应用于电子设备，所述方法包括：
    确定参数信息，并将所述参数信息通过所述接收端收发器发送至所述无线充电装置，以使所述无线充电装置根据所述参数信息确定逆变器的目标工作频率，所述逆变器的目标工作频率大于所述逆变器的当前工作频率。
  24. 根据权利要求23所述的无线充电控制方法，其特征在于，所述参数信息为所述电子设备的整流器的输出功率，所述确定参数信息，并将所述参数信息通过所述接收端收发器发送至所述无线充电装置，具体包括：
    根据整流器的输出电压和输出电流，确定整流器的输出功率；
    向无线充电装置发送输出功率信息，所述输出功率信息指示所述电子设备的整流器的输出功率。
  25. 根据权利要求23所述的无线充电控制方法，其特征在于，所述参数信息为功率损耗值，所述确定参数信息，并将所述参数信息通过所述接收端收发器发送至所述无线充电装置，具体包括：接收无线充电装置发送的输入功率信息，所述输入功率信息指示所述无 线充电装置的输入功率；
    根据所述整流器的输出电压和输出电流，确定所述整流器的输出功率；
    根据所述整流器的输出功率和所述输入功率信息，确定功率损耗值；
    向所述无线充电装置发送功率损耗信息，所述功率损耗信息指示所述功率损耗值。
  26. 根据权利要求23所述的无线充电控制方法，其特征在于，所述参数信息为逆变器的目标工作频率，所述确定参数信息，并将所述参数信息通过所述接收端收发器发送至所述无线充电装置，具体包括：
    接收无线充电装置发送的输入功率信息，所述输入功率信息指示所述无线充电装置的输入功率；
    根据所述整流器的输出电压和输出电流，确定所述整流器的输出功率；
    根据所述整流器的输出功率和所述接收端收发器发送的输入功率信息，确定功率损耗值；
    根据所述功率损耗值，以及预先标定的功率损耗值和逆变器的目标工作频率的对应关系，确定所述逆变器的目标工作频率；
    向所述无线充电装置发送第一参数信息，所述第一参数信息指示所述逆变器的目标工作频率。
  27. 根据权利要求23所述的无线充电控制方法，其特征在于，所述参数信息为逆变器的目标工作频率，所述确定参数信息，并将所述参数信息通过所述接收端收发器发送至所述无线充电装置，具体包括：
    接收无线充电装置发送的第二参数信息，所述第二参数信息用于指示所述无线充电装置的发射端谐振电路的当前品质因数；
    根据所述接收端收发器发送的第二参数信息，以及预先标定的当前品质因数与逆变器的目标工作频率之间的对应关系，确定所述逆变器的目标工作频率，所述目标工作频率大于所述当前工作频率；
    向所述无线充电装置发送第三参数信息，所述第三参数信息指示所述逆变器的目标工作频率。
PCT/CN2023/088320 2022-05-25 2023-04-14 一种无线充电装置、电子设备及无线充电控制方法 WO2023226615A1 (zh)

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