WO2020147127A1 - 无线充电控制方法和充电控制装置 - Google Patents

无线充电控制方法和充电控制装置 Download PDF

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Publication number
WO2020147127A1
WO2020147127A1 PCT/CN2019/072422 CN2019072422W WO2020147127A1 WO 2020147127 A1 WO2020147127 A1 WO 2020147127A1 CN 2019072422 W CN2019072422 W CN 2019072422W WO 2020147127 A1 WO2020147127 A1 WO 2020147127A1
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WO
WIPO (PCT)
Prior art keywords
charging
battery
wireless
power
current
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Application number
PCT/CN2019/072422
Other languages
English (en)
French (fr)
Inventor
杨军
万世铭
林尚波
Original Assignee
Oppo广东移动通信有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Oppo广东移动通信有限公司 filed Critical Oppo广东移动通信有限公司
Priority to PCT/CN2019/072422 priority Critical patent/WO2020147127A1/zh
Priority to EP19910815.0A priority patent/EP3910756A4/en
Priority to CN201980089430.6A priority patent/CN113412567B/zh
Publication of WO2020147127A1 publication Critical patent/WO2020147127A1/zh
Priority to US17/378,148 priority patent/US11502557B2/en

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/90—Circuit arrangements or systems for wireless supply or distribution of electric power involving detection or optimisation of position, e.g. alignment
    • 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
    • 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
    • H02J50/80—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
    • H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
    • H04B5/20—Near-field transmission systems, e.g. inductive or capacitive transmission systems characterised by the transmission technique; characterised by the transmission medium
    • H04B5/24—Inductive coupling
    • H04B5/26—Inductive coupling using coils
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
    • H04B5/70—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes
    • H04B5/72—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes for local intradevice communication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
    • H04B5/70—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes
    • H04B5/79—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes for data transfer in combination with power transfer

Definitions

  • This application relates to the field of wireless charging, and more specifically, to a wireless charging control method and a charging control device.
  • the wired charging method requires the use of a charging cable, which leads to cumbersome operations in the charging preparation stage. Therefore, wireless charging methods are becoming more and more popular among people, and more and more devices to be charged support functions such as wireless charging or wireless transmission.
  • the wireless charging base and the device to be charged may be offset, causing most of the wireless charging signals transmitted by the wireless charging base to be unable to be received by the device to be charged, resulting in low charging efficiency.
  • the device to be charged will always occupy the communication channel to request power, resulting in a waste of channel resources. Therefore, in the process of wireless charging, how to determine that the device to be charged is in an off-position state and how to improve the waste of channel resources has become an urgent problem to be solved.
  • the present application provides a wireless charging control method and a charging control device, which can improve the waste of channel resources caused by a device to be charged in an off-position state.
  • a wireless charging control method including: judging whether the power of the wireless charging signal received by the wireless receiving circuit can reach the charging power currently required by the battery according to the output voltage of the wireless receiving circuit; When the power of the wireless charging signal cannot reach the charging power currently required by the battery, the charging power currently required by the battery is reduced.
  • a charging control device including: a wireless receiving circuit for receiving a wireless charging signal; a control circuit for performing the following operations: judging the wireless charging signal according to the output voltage of the wireless receiving circuit Whether the power can reach the charging power currently required by the battery; when the power of the wireless charging signal cannot reach the charging power currently required by the battery, the charging power currently required by the battery is reduced.
  • the technical solution provided by this application uses the output voltage of the wireless receiving circuit as a basis for judging that the power of the wireless charging signal can reach the charging power currently required by the battery, that is, the device to be charged can be judged according to the output voltage of the wireless receiving circuit Whether it is offset, and after determining that the device to be charged is in the offset state, reduce the current required charging power of the battery. After the charging power required by the battery is reduced, the difference between the charging power received by the battery and the charging power required by the battery will be reduced, which is beneficial to improve the power request of the device to be charged after the offset, and reduce the Occupation of channel resources.
  • Figure 1 is a schematic diagram of a wireless charging system.
  • Fig. 2 is a schematic flowchart of a wireless charging control method provided by an embodiment of the present application.
  • Fig. 3 is a schematic structural diagram of a wireless charging system provided by an embodiment of the present application.
  • FIG. 4 is a schematic flowchart of a wireless charging control method provided by another embodiment of the present application.
  • Fig. 5 is a schematic structural diagram of a charging control device provided by an embodiment of the present application.
  • FIG. 6 is a schematic structural diagram of a wireless charging system provided by another embodiment of the present application.
  • FIG. 7 is a schematic structural diagram of a wireless charging system provided by another embodiment of the present application.
  • FIG. 8 is a schematic structural diagram of a wireless charging system provided by another embodiment of the present application.
  • the traditional wireless charging technology generally connects the power supply equipment (such as adapter) with the wireless charging device (such as wireless charging base), and transmits the output power of the power supply equipment wirelessly (such as electromagnetic waves) to the waiting device through the wireless charging device. Charging equipment, charging equipment to be charged wirelessly.
  • the power supply equipment such as adapter
  • the wireless charging device such as wireless charging base
  • wireless charging methods are mainly divided into three methods: magnetic coupling (or electromagnetic induction), magnetic resonance, and radio waves.
  • mainstream wireless charging standards include QI standard, power matters alliance (PMA) standard, and wireless power alliance (alliance for wireless power, A4WP). Both the QI standard and the PMA standard use magnetic coupling for wireless charging.
  • the A4WP standard uses magnetic resonance for wireless charging.
  • the wireless charging method of an embodiment will be introduced below in conjunction with FIG. 1.
  • the wireless charging system includes a power supply device 110, a wireless charging signal transmitting device 120, and a charging control device 130.
  • the transmitting device 120 may be, for example, a wireless charging base
  • the charging control device 130 may refer to the device to be charged, such as It can be a terminal.
  • the output voltage and output current of the power supply device 110 are transmitted to the transmitting device 120.
  • the transmitting device 120 may convert the output voltage and output current of the power supply device 110 into a wireless charging signal (for example, an electromagnetic signal) through an internal wireless transmitting circuit 121 for transmission.
  • a wireless charging signal for example, an electromagnetic signal
  • the wireless transmitting circuit 121 can convert the output current of the power supply device 110 into alternating current, and convert the alternating current into a wireless charging signal through a transmitting coil or a transmitting antenna.
  • FIG. 1 only exemplarily shows a schematic structural diagram of the wireless charging system, but the embodiment of the present application is not limited thereto.
  • the transmitting device 120 may also be a transmitting device of wireless charging signals
  • the charging control device 130 may also be a receiving device of wireless charging signals.
  • the wireless charging signal receiving device may be, for example, a chip with a wireless charging signal receiving function, which can receive the wireless charging signal transmitted by the transmitting device 120; the wireless charging signal receiving device may also be a device to be charged.
  • the equipment to be charged includes but is not limited to: is set to be connected via a wired line (such as via a public switched telephone network (PSTN), digital subscriber line (DSL), digital cable, direct cable connection, and /Or another data connection/network) and/or via (e.g., for cellular network, wireless local area network (WLAN), digital television such as digital video broadcasting handheld (DVB-H) network Networks, satellite networks, amplitude modulation-frequency modulation (AM-FM) broadcast transmitters, and/or devices for receiving/transmitting communication signals via a wireless interface of another communication terminal.
  • Terminals configured to communicate through a wireless interface may be referred to as "wireless communication terminals", “wireless terminals", and/or “mobile terminals”.
  • mobile terminals include, but are not limited to, satellite or cellular phones; personal communication system (PCS) terminals that can combine cellular radio phones with data processing, fax, and data communication capabilities; can include radio phones, pagers, and the Internet/ Personal digital assistant (PDA) with intranet access, web browser, notebook, calendar and/or global positioning system (GPS) receiver; and conventional laptop and/or palmtop Receiver or other electronic device including radio telephone transceiver.
  • the device to be charged may refer to the mobile terminal being a device or a handheld terminal device, such as a mobile phone, a pad, and so on.
  • the device to be charged mentioned in the embodiments of the present application may refer to a chip system. In this embodiment, the battery of the device to be charged may or may not belong to the chip system.
  • the devices to be charged can also include other electronic devices that require charging, such as e-books, wireless headsets, smart wearable devices, vehicle-mounted devices, mobile power sources (such as power banks, travel chargers, etc.), electronic cigarettes, wireless mice, Bluetooth speakers As well as household equipment with charging requirements, such as lamp, desk, electric toothbrush, etc.
  • the following describes the transmitter of the wireless charging signal and the device to be charged as an example.
  • the charging control device 130 may receive the wireless charging signal transmitted by the wireless transmitting circuit 121 through the wireless receiving circuit 131, and convert the wireless charging signal into the output voltage and output current of the wireless receiving circuit 131.
  • the wireless receiving circuit 131 may convert the wireless charging signal transmitted by the wireless transmitting circuit 121 into alternating current through a receiving coil or a receiving antenna, and perform operations such as rectification and/or filtering on the alternating current to convert the alternating current into the wireless receiving circuit 131 The output voltage and output current.
  • the transmitting device 120 and the charging control device 130 negotiate the transmission power of the wireless transmitting circuit 121 in advance. Assuming that the power negotiated between the transmitting device 120 and the charging control device 130 is 5W, the output voltage and output current of the wireless receiving circuit 131 are generally 5V and 1A. Assuming that the power negotiated between the transmitting device 120 and the charging control device 130 is 10.8W, the output voltage and output current of the wireless receiving circuit 131 are generally 9V and 1.2A.
  • the output voltage of the wireless receiving circuit 131 is not suitable to be directly applied to both ends of the battery 133, it is necessary to perform constant voltage and/or constant current control through the conversion circuit 132 in the charging control device 130 to obtain the charging control device 130.
  • the expected charging voltage and/or charging current of the battery 133 is not suitable to be directly applied to both ends of the battery 133, it is necessary to perform constant voltage and/or constant current control through the conversion circuit 132 in the charging control device 130 to obtain the charging control device 130.
  • the expected charging voltage and/or charging current of the battery 133 is necessary to perform constant voltage and/or constant current control through the conversion circuit 132 in the charging control device 130 to obtain the charging control device 130.
  • the conversion circuit 132 can be used to convert the output voltage of the wireless receiving circuit 131 so that the output voltage and/or output current of the conversion circuit 132 meets the expected charging voltage and/or charging current requirements of the battery 133.
  • the conversion circuit 132 may be a charging integrated circuit (integrated circuit, IC), or may be a power management circuit. During the charging process of the battery 133, the conversion circuit 132 can be used to manage the charging voltage and/or charging current of the battery 133.
  • the conversion circuit 132 may include a voltage feedback function and/or a current feedback function to realize the management of the charging voltage and/or charging current of the battery 133.
  • the charging process of the battery may include one or more of a trickle charging phase, a constant current charging phase, and a constant voltage charging phase.
  • the conversion circuit 132 can utilize the current feedback function to make the current entering the battery 133 during the trickle charging phase meet the expected charging current of the battery 133 (for example, the first charging current).
  • the conversion circuit 132 can use the current feedback function to make the current entering the battery 133 during the constant current charging phase meet the expected charging current of the battery 133 (for example, the second charging current, which can be greater than the first charging current). recharging current).
  • the conversion circuit 132 can use the voltage feedback function to make the voltage applied to the two ends of the battery 133 meet the expected charging voltage of the battery 133 in the constant voltage charging stage.
  • the conversion circuit 132 can be used to step down the output voltage of the wireless receiving circuit 131, so as to make the charging obtained after the step-down conversion. The voltage meets the expected charging voltage requirement of the battery 133.
  • the conversion circuit 132 can be used to boost the output voltage of the wireless receiving circuit 131, so that the voltage obtained after the boost conversion The charging voltage meets the expected charging voltage requirement of the battery 133.
  • the conversion circuit 132 can perform step-down processing on the output voltage of the wireless receiving circuit 131. So that the charging voltage obtained after the step-down meets the expected charging voltage requirement of the battery 133.
  • the conversion circuit 132 for example, a Boost boost circuit
  • the wireless receiving circuit 131 can be used for the wireless receiving circuit 131
  • the output voltage is boosted, so that the boosted charging voltage meets the expected charging voltage requirement of the battery 133.
  • the required charging voltage and/or charging current of the battery may be constantly changing in different charging stages.
  • the output voltage and/or output current of the wireless receiving circuit may need to be continuously adjusted to meet the current charging requirements of the battery.
  • the charging voltage of the battery can remain unchanged.
  • the charging power required by the battery also continues to increase.
  • the wireless receiving circuit needs to increase the output power to meet the charging demand of the battery.
  • the communication control circuit may transmit instruction information to the transmitting device to instruct the transmitting device to increase the transmitting power to increase the output power of the wireless receiving circuit. Therefore, during the charging process, the communication control circuit can communicate with the transmitting device, so that the output power of the wireless receiving circuit can meet the charging requirements of the battery in different charging stages.
  • the transmitting device can increase the transmitting power to meet the battery charging requirements.
  • the device to be charged when the device to be charged is charged through the transmitting device of the wireless charging signal, the device to be charged may be biased, that is, the receiving coil of the device to be charged is not aligned with the transmitting coil of the transmitting device. Misalignment or offset.
  • the wireless charging signal transmitted by the transmitting coil cannot be completely received by the receiving coil, resulting in a decrease in charging efficiency.
  • the charging power received by the device to be charged is less than the charging power transmitted by the transmitting device. Since the charging power transmitted by the transmitting device has an upper limit, when the transmitting power of the transmitting device reaches the upper limit, the battery cannot meet the requirements. For the charging demand, the equipment to be charged will constantly require the transmitting device to provide more power. Specifically, the device to be charged will continuously transmit instruction information to the transmitting device to instruct to increase the output power. However, the transmitting power of the transmitting device has reached the upper limit and cannot continue to increase. Therefore, even if the device to be charged continuously requests to increase the power, the transmitting device still cannot meet the charging demand of the device to be charged. In addition, because the device to be charged continuously occupies channel resources to request power increase, channel resources are wasted. In addition, the device to be charged always occupies channel resources, resulting in failure to perform normal foreign object detection (FOD), which affects the FOD function.
  • FOD foreign object detection
  • the embodiment of the present application provides a wireless charging control method, which can improve the waste of channel resources by wireless charging.
  • FIG. 2 is a schematic block diagram of a wireless charging control method provided by an embodiment of the present application. The method shown in FIG. 2 includes steps S210-S220.
  • S210 According to the output voltage of the wireless receiving circuit, determine whether the power of the wireless charging signal received by the wireless receiving circuit can reach the charging power currently required by the battery.
  • the charging power of the wireless receiving circuit usually needs to match the charging power currently required by the battery, that is, the charging power of the wireless receiving circuit needs to meet the current required charging power of the battery.
  • the device to be charged can charge the battery according to the charging power required by the battery.
  • the output current of the wireless receiving circuit generally remains unchanged.
  • the output current of the wireless receiving circuit and the input current of the wireless transmitting circuit are usually the same. Therefore, the output power of the wireless receiving circuit can be reflected by the output voltage of the wireless receiving circuit, and the output power of the wireless receiving circuit can be understood as the power of the wireless charging signal received by the wireless receiving circuit. Further, the output voltage of the wireless receiving circuit can be used to determine whether the output power of the wireless receiving circuit can reach the charging power currently required by the battery.
  • the device to be charged may continuously request the transmitter of the wireless charging signal to increase the transmission power to meet the current charging demand of the battery.
  • the transmission power of the transmitting device has been transmitted to the maximum value, and there is no way to continue to increase it. Therefore, the request for the device to be charged is futile.
  • the device to be charged continuously transmits request information to the transmitting device, which will occupy the communication channel all the time, resulting in a waste of channel resources and also affect the FOD function of the device to be charged.
  • the charging power currently required by the battery can be reduced. After the current required charging power of the battery is reduced, the difference between the charging power received by the battery and the charging power currently required by the battery will decrease. It is possible that the charging power received by the battery is equal to the current required charging of the battery.
  • the charging power transmitted by the transmitting device can meet the current demand of the battery for charging power.
  • the device to be charged will not request the transmitting device to increase the charging power, and therefore will not occupy channel resources, which can reduce the waste of channel resources.
  • the technical solution provided by the embodiment of the present application can also detect whether the device to be charged is offset.
  • judging whether the device to be charged is biased is achieved by detecting the frequency (or resonant frequency) of the wireless charging signal.
  • the transmitting device will adjust the transmitting voltage of the transmitting device by changing the transmitting frequency of the wireless charging signal. Therefore, the wireless charging signal can be detected
  • this method is only suitable for variable frequency charging, and it is not suitable for wireless charging with fixed frequency.
  • the technical solution provided by the embodiment of the present application determines whether the device to be charged is biased according to the output voltage of the wireless receiving circuit, which can be applied to the case of charging the device to be charged in a fixed frequency manner. Of course, the same applies to the way that the frequency conversion method is used to charge the device to be charged.
  • the user can also be prompted to position the device to be charged to better perform the battery Recharge.
  • prompt information can be displayed on the interface of the device to be charged, or an alarm prompt sound can be sent, or the user can be prompted to position the device to be charged by means of flashing indicator lights.
  • step 210 There are many ways to implement step 210, which is not specifically limited in the embodiment of the present application.
  • the output power of the wireless receiving circuit can be determined based on the output voltage and output current of the wireless receiving circuit, and then the difference between the output power of the wireless receiving circuit and the target power can be used to determine the wireless charging signal received by the wireless receiving circuit. Whether the power can meet the current required charging power of the battery. If the output power of the wireless receiving circuit is greater than or equal to the target power, it can be determined that the power of the wireless charging signal received by the wireless receiving circuit can meet the current required charging power of the battery; if the output power of the wireless receiving circuit is less than the target power, then It is determined that the power of the wireless charging signal received by the wireless receiving circuit cannot meet the current required charging power of the battery.
  • the power of the wireless charging signal cannot reach the charging power currently required by the battery within the preset time, it can be determined that the power of the wireless charging signal cannot meet the charging power currently required by the battery.
  • the preset time may be, for example, 30s or 1 minute.
  • the power of the wireless charging signal still cannot reach the charging power currently required by the battery within the preset time, which may mean that the power of the wireless charging signal still cannot reach the charging power required by the battery after being adjusted.
  • the output power of the wireless receiving circuit still does not reach the charging power required by the battery. At this time, it can be determined that the charging power of the wireless charging signal cannot reach the required charging power of the battery. The charging power.
  • the desired target voltage may be the output voltage of the wireless receiving circuit currently expected by the battery.
  • the desired target voltage may be the output voltage of the wireless receiving circuit that matches the charging voltage and/or charging current currently required by the battery.
  • the actual output voltage of the wireless receiving circuit When the actual output voltage of the wireless receiving circuit does not reach the desired target voltage, it can transmit indication information to the transmitting device to instruct the transmitting device to increase the transmitting voltage; after instructing the transmitting device to increase the transmitting voltage, if the output voltage of the wireless receiving circuit still fails When the target voltage is reached, it can be determined that the power of the wireless charging signal cannot reach the charging power currently required by the battery.
  • the output voltage of the wireless receiving circuit still cannot reach the target voltage, it can be determined that the transmitting voltage of the transmitting device has reached the maximum and cannot continue to rise, and the output voltage of the wireless receiving circuit cannot satisfy the battery charging
  • the power demand can reduce the charging power required by the battery.
  • the transmitting device may be instructed to increase the transmitting voltage multiple times, for example, at least two indications are sent to the transmitting device to instruct to increase the transmitting voltage. Under normal circumstances, after instructing the transmitting device to increase the transmitting voltage several times, the output voltage of the wireless receiving circuit can reach the target voltage.
  • the output voltage of the wireless receiving circuit still cannot reach the target voltage after instructing the transmitting device to increase the transmitting voltage several times, it can be determined that the device to be charged is biased, and then it is determined that the power of the wireless charging signal cannot reach the current required charging of the battery Power can improve the accuracy of the judgment result.
  • the charging voltage and/or charging current required by the battery may change during the wireless charging process, the charging voltage and/or charging current required by the battery may increase. There may be a certain moment when the wireless receiving circuit is The output voltage does not reach the target voltage, but this situation is not caused by the bias of the device to be charged. In fact, the output voltage of the wireless receiving circuit can continue to increase. Therefore, the transmitting device can be instructed to increase the transmitting voltage. If the output voltage of the wireless receiving circuit can reach the target voltage after the transmitting device is instructed to increase the transmitting voltage, then Continue to charge the battery.
  • the output voltage of the wireless receiving circuit still cannot reach the target voltage after instructing the transmitting device to increase the transmitting voltage several times, it means that the transmitting power of the transmitting device has reached the maximum and cannot continue to increase, and then it can be determined that the power of the wireless charging signal cannot be increased.
  • this judgment method can improve the accuracy of judgment.
  • the indication information may directly indicate the output voltage of the wireless receiving circuit, or the indication information may indicate the difference between the target voltage and the output voltage of the wireless receiving circuit, or , The indication information can indicate the output voltage and target voltage of the wireless receiving circuit.
  • the indication information can also indicate any combination of the foregoing content, which is not specifically limited in the embodiment of the present application.
  • the indication information may be carried in a control error packet (CEP).
  • CEP control error packet
  • the embodiment of the application can directly configure the target voltage to the transmitting device.
  • the device to be charged can only send the output voltage of the wireless receiving circuit to the transmitting device, and the transmitting device will further determine the relationship between the output voltage of the wireless receiving circuit and the target The difference between the voltages adjusts the emission voltage of the emission device.
  • the device to be charged may report the difference between the output voltage of the wireless receiving circuit and the target voltage to the transmitting device.
  • the wireless receiving circuit needs to increase its output voltage to reach the target voltage.
  • the output voltage of the wireless receiving circuit is determined by the transmitting voltage of the wireless transmitting circuit.
  • the transmitting voltage of the transmitting circuit makes the output voltage of the wireless receiving circuit reach the target voltage.
  • the transmitting device can increase the transmitting voltage of the wireless transmitting circuit according to the difference between the output voltage of the wireless receiving circuit and the target voltage.
  • the device to be charged can report the difference between the output voltage of the wireless receiving circuit and the target voltage to the transmitting device through CEP.
  • the device to be charged can send a CEP to the transmitting device, and the CEP can include the wireless receiving circuit. The difference between the output voltage and the target voltage.
  • the embodiment of the present application does not specifically limit the manner of reducing the charging power currently required by the battery.
  • the charging power currently required by the battery can be directly reduced to a small value, so that the power of the wireless charging signal can meet the charging power currently required by the battery. Reducing the charging power currently required by the battery can be achieved by reducing the charging current currently required by the battery.
  • a stepwise current reduction method can be used to gradually reduce the charging power required by the battery.
  • the charging power required by the battery can be reduced by reducing a certain current value each time.
  • the following describes in detail the process of achieving the output power of the wireless receiving circuit to reach the desired target voltage by reducing the current.
  • the solution provided by the embodiment of the present application may be suitable for charging a battery in a boosting and current-increasing manner, which is described below with reference to FIG. 3.
  • the voltage of the battery remains the same for a period of time. Therefore, the charging voltage of the battery can also remain unchanged.
  • the charging power required by the battery increases, it also means the charging required by the battery.
  • the power increases.
  • the charging power required by the battery increases, and the output power of the wireless receiving circuit needs to increase. Since the output current of the power supply device remains basically unchanged, it means that the output current of the wireless receiving circuit also remains basically unchanged. Therefore, the output power can be increased by increasing the output voltage of the wireless receiving circuit.
  • the output voltage of the wireless receiving circuit can be increased by increasing the output voltage of the power supply device.
  • the power supply device can increase the output power by increasing the output voltage to meet the battery's demand for charging power. This method of increasing the charging current of the battery by increasing the output voltage of the power supply device can be referred to as a step-up process.
  • the charging current of the battery can be increased by instructing the transmitting circuit to increase the transmitting voltage. If the device to be charged is not biased, the transmitting voltage of the wireless transmitting circuit can meet the maximum charging current requirement of the battery.
  • the power received by the wireless receiving circuit is less than the power transmitted by the wireless transmitting circuit.
  • the charging current provided by the wireless receiving circuit to the battery may still be less than the current battery. The situation of the required charging current.
  • the transmitting power of the transmitting device is 15W
  • the corresponding transmitting voltage and transmitting current are 15V and 1A. Due to the bias of the device to be charged, the power received by the wireless receiving circuit is only 12W, the corresponding output voltage and output current It is 12V and 1A.
  • the charging voltage and charging current required by the current battery are 15V and 1A
  • the expected output voltage of the wireless receiving circuit is 15V
  • the charging current required by the battery is 1A Corresponds to the 15V output voltage of the wireless receiving circuit.
  • the device to be charged may charge the battery according to the charging voltage and charging current of 15V and 0.8A. Therefore, since the output voltage of the wireless receiving circuit 12V is less than the desired target voltage of 15V, the output voltage of the wireless receiving circuit cannot reach the target voltage, resulting in the battery charging current 0.8A less than the battery charging current 1A.
  • the device to be charged will always transmit The device transmits CEP to instruct the transmitting device to increase the transmission voltage, which will cause the occupation of communication channel resources.
  • the solution provided by the embodiment of the present application can reduce the target voltage by reducing the charging current required by the battery, so as to reduce the difference between the output voltage of the wireless receiving circuit and the target voltage.
  • One solution is to directly reduce the charging current required by the battery to a minimum so that the target voltage is less than or equal to the output voltage of the wireless receiving circuit.
  • Another solution is to reduce the charging current required by the battery by gradually reducing the current. For example, the charging current required by the battery can be reduced by 100 mA each time.
  • the charging current required by the battery can be reduced by 100 mA, and then continue to The output voltage of the wireless receiving circuit is detected. If the difference between the output voltage of the wireless receiving circuit and the target voltage is 0, the battery can be charged with the current charging current; if the charging current required by the battery is reduced, the wireless receiving circuit If the difference between the output voltage and the target voltage is still not 0 for many times, you can continue to reduce the charging current required by the battery by 100mA, and so on, until the difference between the output voltage of the wireless receiving circuit and the target voltage is 0.
  • This method can find the critical point where the output voltage of the wireless receiving circuit is equal to the target voltage in the process of gradually reducing the required charging current of the battery, so that the wireless receiving circuit can charge the battery with the maximum charging current.
  • the charging current required by the battery can be adjusted in a wide range; when the difference is small, the charging current required by the battery can be adjusted in a small range. Adjustment.
  • the device to be charged can set multiple gears for the charging current required by the battery.
  • the gears of the charging current required by the battery can be adjusted to at least 2 grids, the current value of each grid can be a fixed value, for example, 50mA, 100mA, etc.; when the difference between the output voltage of the wireless receiving circuit and the target voltage is small, the battery charging current can be adjusted One grid.
  • the charging current level required by the battery can be adjusted by two divisions; when the output voltage of the wireless receiving circuit is less than the target voltage of 1V, the battery required Adjust the charging current gear by one step.
  • the output voltage of the wireless receiving circuit is 12V, which is less than the target voltage of 15V, and the current required charging current is 1A.
  • the charging current required by the battery is reduced from 1A to 0.8A.
  • the target voltage is reduced from 15V to 12V. Since the current output voltage of the wireless receiving circuit is 12V, The output voltage of the wireless receiving circuit is equal to the target voltage, and the device to be charged can no longer instruct the transmitting device to increase the output power, reducing the occupation of channel resources.
  • the charging current of the battery may be reduced in the process of reducing the charging current required by the battery. Since the charging voltage of the battery will not change for a period of time, the charging power of the battery may be Will decrease. After the charging power of the device to be charged is reduced, the output power of the transmitting device can also be reduced accordingly, which can prevent the transmitting device from working at full load all the time and reduce the heat of the transmitting device.
  • the device to be charged may be aligned or the charging efficiency may be improved.
  • the receiving coil of the device to be charged may be aligned with the transmitting coil of the transmitting device, or The offset of the receiving coil of the device to be charged and the transmitting coil of the transmitting device is within an acceptable range, and within the acceptable range, the charging of the device to be charged by the transmitting device will not be affected.
  • the receiving efficiency of the wireless receiving circuit increases. If you continue to charge the battery with a small current, the charging speed may be too slow. Therefore, the embodiment of the present application also provides a wireless charging control method, which can charge the battery with the maximum charging current after the device to be charged is set up.
  • the charging current required by the battery After reducing the charging current required by the battery, continue to detect the output voltage of the wireless receiving circuit to determine the difference between the output voltage of the wireless receiving circuit and the target voltage. When it is detected multiple times that the difference between the output voltage of the wireless receiving circuit and the target voltage is 0, for example, if the difference between the output voltage of the wireless receiving circuit and the target voltage is detected three times in a row 0, you can increase the charging current required by the battery. For example, the charging current required by the battery can be increased to the target current. If the output voltage of the wireless receiving circuit can be equal to the target voltage after the charging current required by the battery is increased, the charging current after the increase can be The battery is charged, which can increase the charging speed.
  • the target current may be the maximum charging current required by the battery.
  • the embodiment of the present application does not specifically limit the manner of increasing the charging current required by the battery to the target current.
  • the current required to charge the battery can be directly increased to the target current at a time.
  • a method of increasing a certain current value each time such as a method of increasing a current of 50 mA each time, can also be used to increase the charging current required by the battery to the target current.
  • the charging current required to increase the battery can be directly increased to the maximum charging current once.
  • the wireless receiving circuit can detect the CEP, and the difference between the output voltage of the wireless receiving circuit in the CEP and the target voltage is detected multiple times When the value is 0, the charging current required by the battery can be directly increased to the maximum charging current. If after increasing the charging current required by the battery, the value of the difference between the output voltage of the wireless receiving circuit and the target voltage is still 0, the battery can be charged with the increased charging current. If the value of the difference between the output voltage of the wireless receiving circuit and the target voltage is not 0 after the charging current required by the battery is increased, the charging current currently required by the battery can be maintained at the current current.
  • Increasing the charging current required by the battery may also be by adopting a stepwise current increase method to gradually increase the charging current required by the battery.
  • the wireless receiving circuit can detect the CEP. When the difference between the output voltage of the wireless receiving circuit in the CEP and the target voltage is 0, it can be used to increase a smaller current each time. Way to increase the charging current required by the battery. For example, the current can be increased by 50mA every 20s. Specifically, if the difference between the output voltage of the wireless receiving circuit and the target voltage in multiple consecutive CEPs is 0, the charging current required by the battery can be increased by 50 mA, and then the output voltage of the wireless receiving circuit can be continued Perform testing.
  • the difference between the output voltage of the wireless receiving circuit and the target voltage is not 0 after the charging current required by the battery is increased, the charging current required by the battery is reduced to the charging current before the increase. If after 20s, the difference between the output voltage of the wireless receiving circuit in the CEP and the target voltage is still 0, you can continue to increase the charging current required by the battery by 50mA, and so on, until the required charging of the battery The current rises to the maximum charging current.
  • This method can not only charge the battery with the maximum charging current after the device to be charged is set from the offset state. It is also possible to charge the battery with the largest possible charging current even if the device to be charged is not aligned, but the offset distance is adjusted.
  • the transmitting device After the device to be charged is connected to the transmitting device, the transmitting device starts to charge the device to be charged.
  • the transmitting device can charge the device to be charged by boosting and increasing the current until the charging current of the battery reaches the maximum.
  • the maximum charging current of the battery can mean that the charging current of the battery remains unchanged for a long period of time without increasing. See the above description for the specific process of boosting and raising the flow.
  • S402 Detect the difference between the output voltage of the wireless receiving circuit in the CEP and the target voltage, and determine whether the difference is 0 for multiple consecutive times.
  • the difference is not 0 for multiple consecutive times, for example, it is detected that the voltage difference between the output voltage of the wireless receiving circuit in the CEP and the target voltage is not 0 for 2 or more consecutive times, indicating that the power supply device
  • the output voltage has reached the upper limit, that is, the output voltage of the wireless receiving circuit has reached the maximum value, and there is no way to continue to increase it.
  • This situation also means that the device to be charged is biased, causing the output voltage of the wireless receiving circuit to fail to meet the charging requirements of the battery.
  • S404 Reduce the charging current currently required by the battery.
  • the charging current required by the battery can be reduced by 100 mA.
  • S405 After reducing the charging current required by the battery, continue to detect the difference between the output voltage of the wireless receiving circuit in the CEP and the target voltage, and determine whether the difference is zero. If the difference is not 0 for multiple consecutive times, for example, it is not 0 for two or more consecutive times, it indicates that the output voltage of the wireless receiving circuit still cannot meet the charging demand of the battery. At this time, you can continue to reduce the charging current required by the battery by 100mA until the pressure difference is zero.
  • the wireless charging control method provided by the embodiment of the present application is described in detail above, and the charging control device according to the embodiment of the present application will be described below with reference to FIGS. 5 to 8. It should be understood that the features of the method embodiment are also applicable to the device embodiment.
  • the device embodiment and the method embodiment correspond to each other, so the parts that are not described in detail can refer to the previous method embodiments.
  • the charging system shown in FIG. 5 may include a transmitting device 220 and a charging control device 230.
  • the charging control device may refer to the device to be charged as described above, and the charging control device may also be referred to as a wireless charging signal receiving device.
  • the transmitting device 220 may include a wireless transmitting circuit 221, and the wireless transmitting circuit 221 may be used to transmit a wireless charging signal to charge the battery 232.
  • the wireless transmission circuit 221 may include a wireless transmission drive circuit and a transmission coil (or transmission antenna).
  • the wireless transmission drive circuit can be used to generate higher-frequency alternating current, and the transmitting coil or transmitting antenna can be used to convert the higher-frequency alternating current into electromagnetic signals for transmission.
  • the charging control device 230 may include a wireless receiving circuit 231 and a communication control circuit 235.
  • the wireless receiving circuit 231 may be used to receive the wireless charging signal transmitted by the wireless transmitting circuit 221, and convert the wireless charging signal into the output voltage and output current of the wireless receiving circuit.
  • the communication control circuit 235 may have a communication function, and may be used to communicate with the transmitting device 220 during the wireless charging process. More specifically, the communication control circuit 235 can be used to communicate with the transmitting device 220 according to the output voltage of the wireless receiving circuit.
  • the communication control circuit 235 can be used to perform the following operations: according to the output voltage of the wireless receiving circuit 231, determine whether the power of the wireless charging signal can reach the charging power currently required by the battery; when the power of the wireless charging signal cannot reach the current required by the battery 232 When charging power, the current required charging power of the battery 232 is reduced.
  • the control function in the communication control circuit 235 may be implemented by, for example, a micro control unit (micro control unit, MCU).
  • the communication control circuit 235 can be used to determine whether the output voltage of the wireless receiving circuit 231 can reach the desired target voltage according to the output voltage of the wireless receiving circuit 231; when the output voltage of the wireless receiving circuit 231 cannot reach the target voltage, determine The power of the wireless charging signal received by the wireless receiving circuit 231 cannot reach the charging power currently required by the battery.
  • the target voltage may be the output voltage of the wireless receiving circuit that matches the charging power currently required by the battery.
  • the charging control device 230 may further include a detection circuit, which may be used to detect the output voltage of the wireless receiving circuit 231.
  • the communication control circuit 235 can compare the detected output voltage with the target voltage, and when the output voltage of the wireless receiving circuit 231 is less than the target voltage, it transmits instruction information to the transmitting device 220 to instruct the transmitting device 220 to increase the power of the wireless transmitting circuit 221 The voltage is transmitted to reduce the difference between the output voltage of the wireless receiving circuit 231 and the target voltage.
  • the communication control circuit 235 can determine that the charging power of the wireless charging signal cannot reach the battery The current required charging power, at this time, the communication control circuit 235 can determine that the device to be charged is in an offset state.
  • the communication control circuit 235 may also reduce the charging power required by the battery when the power of the wireless charging signal cannot reach the charging power required by the battery within a preset time.
  • the indication information may include the output voltage of the wireless receiving circuit, or the indication information may include the difference between the output voltage of the wireless receiving circuit and the target voltage, or the indication information It can include the output voltage and target voltage of the wireless receiving circuit.
  • the content of the instruction information may also include any combination of the foregoing content.
  • the indication information may be carried in the CEP.
  • reducing the charging power currently required by the battery 232 can be achieved by reducing the charging current required by the battery 232. Since the voltage of the battery basically does not change for a period of time during the charging process, the charging voltage required by the battery basically does not change. Therefore, the charging power required by the battery can be reduced by reducing the charging current required by the battery.
  • the charging current required by the battery can be directly reduced to the minimum charging current. Because there is a corresponding relationship between the charging current required by the battery and the target voltage, the battery required After the charging current decreases, the target voltage will also decrease accordingly. Therefore, after the charging current of the battery is reduced to the minimum charging current, the output voltage of the wireless receiving circuit can reach the target voltage, that is, the power of the wireless charging signal can meet the current required charging current of the battery.
  • the current required charging current of the battery may be gradually reduced. For example, the current required charging current of the battery may be reduced by a certain current value each time, until the power of the wireless charging signal can meet the requirements. The current required charging current of the battery.
  • the communication control circuit 235 may reduce the charging current required by the battery 232 according to the difference between the output voltage of the wireless receiving circuit 231 and the target voltage.
  • the communication control circuit 235 determines that the difference between the output voltage of the wireless receiving circuit 231 and the target voltage is large, the charging current required by the battery 232 can be adjusted relatively; when the communication control circuit 235 determines that the wireless receiving circuit 231 When the difference between the output voltage and the target voltage is small, the charging current required by the battery 232 can be adjusted relatively small.
  • the charging control device 230 can set multiple gears for the charging current required by the battery 232.
  • the communication control circuit 235 determines that the output voltage of the wireless receiving circuit 231 has a large difference from the target voltage, it can set the battery 232 required
  • the charging current is reduced by multiple gears, and the current value of each gear can be a fixed value, for example, 50mA, 100mA, etc.; when the difference between the output voltage of the communication control circuit 235 and the wireless receiving circuit 231 and the target voltage is small, The gear of the charging current required by the battery 232 is lowered by one gear.
  • the charging control device 230 may be in a straightening situation. At this time, if the charging is performed with a smaller charging current, the charging speed will be too slow. Therefore, after reducing the charging power required by the battery, you can try to increase the charging current required by the battery. If the output voltage of the wireless receiving circuit 231 can reach the target voltage after the charging current required by the battery is increased, the battery 232 can be charged with the increased charging current.
  • the embodiment of the present application does not specifically limit the manner of increasing the charging current required by the battery.
  • the charging current required by the battery can be directly increased to the target current.
  • the charging current required by the battery can also be increased to the target current in a step-by-step current manner.
  • the charging current required by the battery can be increased to the target current by increasing a certain current value each time.
  • the target current may be the maximum charging current required by the battery.
  • the output voltage of the wireless receiving circuit 231 After reducing the current required charging power of the battery 232, continue to detect the output voltage of the wireless receiving circuit 231. After detecting that the output voltage of the wireless receiving circuit 231 can reach the target voltage for a long period of time, you can Increase the charging current required by the battery. After the charging current required by the battery 232 is increased, the output voltage of the wireless receiving circuit 231 is detected. If the output voltage of the wireless receiving circuit 231 can reach the target voltage, the battery 232 can be charged with the increased charging current; if The output voltage of the wireless receiving circuit 231 cannot reach the target voltage, and the battery 232 is charged by maintaining the previous charging current.
  • increasing the charging current required by the battery can be directly increasing the charging current required by the battery to the maximum charging current, or it can be increased by gradually increasing the current.
  • the application embodiment does not specifically limit this.
  • the method of increasing or decreasing the charging current required by the battery can refer to the above method-side embodiment, which will not be repeated here.
  • the embodiment of the present application does not specifically limit the communication mode between the communication control circuit 235 and the transmitting device 220.
  • the communication control circuit 235 and the transmitting device 220 may adopt Bluetooth (bluetooth) communication, wireless fidelity (Wi-Fi) communication, or backscatter modulation (or power Load modulation method) communication, short-range wireless communication based on high carrier frequency, optical communication, ultrasonic communication, ultra-wideband communication or mobile communication and other wireless communication methods for communication.
  • the short-range wireless communication module based on a high carrier frequency may include an integrated circuit (IC) chip with an extremely high frequency (EHF) antenna packaged inside.
  • the high carrier frequency may be 60 GHz.
  • the optical communication may use an optical communication module for communication.
  • the optical communication module may include an infrared communication module, and the infrared communication module may use infrared to transmit information.
  • mobile communication may be communication using a mobile communication module.
  • the mobile communication module can use mobile communication protocols such as 5G communication protocol, 4G communication protocol or 3G communication protocol for information transmission.
  • the reliability of communication can be improved, and the voltage ripple caused by the signal coupling method can be avoided. Wave affects the voltage processing process of the step-down circuit.
  • the communication control circuit 235 and the transmitting device 220 may also communicate in a wired communication manner of a data interface.
  • Fig. 6 is another schematic diagram of a charging system provided by an embodiment of the present application.
  • the wireless charging signal transmitting device 220 may further include a charging interface 223, and the charging interface 223 may be used to connect to an external power supply device 210.
  • the wireless transmitting circuit 221 can also be used to generate a wireless charging signal according to the output voltage and output current of the power supply device 210.
  • the first communication control circuit 222 can also adjust the amount of power drawn by the wireless transmission circuit 221 from the output power of the power supply device 210 during the wireless charging process to adjust the transmission power of the wireless transmission circuit 221 so that the wireless transmission circuit transmits
  • the power can meet the charging demand of the battery.
  • the power supply device 210 can also directly output a relatively large fixed power (for example, 40W), and the first communication control circuit 222 can directly adjust the amount of power drawn by the wireless transmitting circuit 221 from the fixed power provided by the power supply device 210.
  • the output power of the power supply device 210 may be fixed.
  • the power supply device 210 can directly output a relatively large fixed power (such as 40W), and the power supply device 210 can provide the wireless charging device 220 with an output voltage and an output current according to the fixed output power.
  • the first communication control circuit 222 may extract a certain amount of power from the fixed power of the power supply device for wireless charging according to actual needs. That is to say, the embodiment of the present application allocates the control right of the transmission power adjustment of the wireless transmission circuit 221 to the first communication control circuit 222, and the first communication control circuit 222 can receive the instruction information sent by the second communication control circuit 235.
  • the transmission power of the wireless transmission circuit 221 is adjusted immediately to meet the current charging requirements of the battery, which has the advantages of fast adjustment speed and high efficiency.
  • the embodiment of the present application does not specifically limit the manner in which the first communication control circuit 222 extracts the amount of power from the maximum output power provided by the power supply device 210.
  • a voltage conversion circuit 224 may be provided inside the transmitting device 220 of the wireless charging signal, and the voltage conversion circuit 224 may be connected to the transmitting coil or the transmitting antenna for adjusting the power received by the transmitting coil or the transmitting antenna.
  • the voltage conversion circuit 224 may include, for example, a pulse width modulation (PWM) controller and a switch unit.
  • PWM pulse width modulation
  • the first communication control circuit 222 can adjust the transmission power of the wireless transmission circuit 221 by adjusting the duty cycle of the control signal sent by the PWM controller.
  • the embodiment of the present application does not specifically limit the type of the power supply device 210.
  • the power supply device 210 may be a device such as an adapter, a power bank, a car charger, or a computer.
  • the charging interface 223 may be a USB interface.
  • the USB interface may be, for example, a USB 2.0 interface, a micro USB interface, or a USB TYPE-C interface.
  • the charging interface 223 may also be a lightning interface, or any other type of parallel port and/or serial port that can be used for charging.
  • the embodiment of the present application does not specifically limit the communication mode between the first communication control circuit 222 and the power supply device 210.
  • the first communication control circuit 222 may be connected to the power supply device 210 through a communication interface other than the charging interface, and communicate with the power supply device 210 through the communication interface.
  • the first communication control circuit 222 may communicate with the power supply device 210 in a wireless manner.
  • the first communication control circuit 222 may perform near field communication (NFC) with the power supply device 210.
  • NFC near field communication
  • the first communication control circuit 222 can communicate with the power supply device 210 through the charging interface 223 without setting an additional communication interface or other wireless communication module, which can simplify the implementation of the wireless charging device 220.
  • the charging interface 223 is a USB interface, and the first communication control circuit 222 can communicate with the power supply device 210 based on the data lines (such as D+ and/or D- lines) in the USB interface.
  • the charging interface 223 may be a USB interface (such as a USB TYPE-C interface) supporting a power delivery (PD) communication protocol, and the first communication control circuit 222 and the power supply device 210 may communicate based on the PD communication protocol.
  • PD power delivery
  • adjusting the transmission power of the wireless charging signal by the first communication control circuit 222 may refer to that the first communication control circuit 222 adjusts the transmission power of the wireless charging signal by adjusting the input voltage and/or input current of the wireless transmission circuit 221.
  • the first communication control circuit may increase the transmission power of the wireless transmission circuit by increasing the input voltage of the wireless transmission circuit.
  • the wireless charging signal receiving device 230 further includes a first charging channel 233 through which the output voltage and/or output current of the wireless receiving circuit 231 can be provided to the battery 232 , To charge the battery 232.
  • a voltage conversion circuit 239 may be further provided on the first charging channel 233, and the input end of the voltage conversion circuit 239 is electrically connected to the output end of the wireless receiving circuit 231, and is used to perform constant voltage on the output voltage of the wireless receiving circuit 231. And/or constant current control to charge the battery 232 so that the output voltage and/or output current of the voltage conversion circuit 239 matches the current required charging voltage and/or charging current of the battery.
  • increasing the transmission power of the wireless transmission circuit 221 may refer to increasing the transmission voltage of the wireless transmission circuit 221, and increasing the transmission voltage of the wireless transmission circuit 221 may be achieved by increasing the output voltage of the voltage conversion circuit 224.
  • the first communication control circuit 222 receives the instruction to increase the transmission power sent by the second communication control circuit 235, it can increase the transmission power of the wireless transmission circuit 221 by increasing the output voltage of the voltage conversion circuit 224.
  • the embodiment of the present application does not specifically limit the manner in which the second communication control circuit 235 sends instruction information to the first communication control circuit 222.
  • the second communication control circuit 235 may periodically send instruction information to the first communication control circuit 222.
  • the second communication control circuit 235 may send instruction information to the first communication control circuit 222 only when the output voltage of the wireless receiving circuit is less than the target voltage. If the output voltage of the wireless receiving circuit 231 is equal to the target voltage, the second The communication control circuit 235 may not send the instruction information to the first communication control circuit 222.
  • the wireless charging signal receiving device may further include a detection circuit 234, which may detect the output voltage of the wireless receiving circuit 231, and the second communication control circuit 235 may send a signal to the first communication control circuit 235 according to the output voltage of the wireless receiving circuit 231.
  • the communication control circuit 222 sends instruction information to instruct the first communication control circuit 222 to adjust the transmit power of the wireless transmitting circuit 221, where the instruction information may include at least one of the following information: the output voltage of the wireless receiving circuit, the target voltage, The difference between the output voltage of the wireless receiving circuit and the target voltage.
  • the transmit power of the wireless charging signal needs to be increased to meet the current charging requirements of the battery.
  • the charging current of the battery may continue to decrease, and the charging power required by the battery will also decrease accordingly.
  • the transmit power of the wireless charging signal needs to be reduced to meet the current charging requirements of the battery.
  • the first communication control circuit 222 can adjust the transmission power of the wireless charging signal according to the instruction information. It can mean that the first communication control circuit 222 adjusts the transmission power of the wireless charging signal so that the transmission power of the wireless charging signal is equal to the current required charging voltage of the battery. And/or the charging current.
  • the matching of the transmission power of the wireless transmission circuit 221 with the charging voltage and/or charging current currently required by the battery 232 may refer to the configuration of the transmission power of the wireless charging signal by the first communication control circuit 222 such that the output voltage of the first charging channel 233 And/or the output current matches the charging voltage and/or charging current currently required by the battery 232 (or, the configuration of the transmission power of the wireless charging signal by the first communication control circuit 222 makes the output voltage of the first charging channel 233 and/or Or the output current meets the charging requirements of the battery 232 (including the requirements of the battery 232 for charging voltage and/or charging current)).
  • the output voltage and/or output current of the first charging channel 232 matches the charging voltage and/or charging current currently required by the battery 232
  • the voltage value and/or current value of the output direct current is equal to the charging voltage value and/or charging current value required by the battery 232 or within a floating preset range (for example, the voltage value fluctuates between 100 mV and 200 mV, the current value Floating from 0.001A to 0.005A, etc.).
  • the charging process of the battery may include at least one of a trickle charging phase, a constant current charging phase, and a constant voltage charging phase.
  • the second communication control circuit 235 described above performs wireless communication with the first communication control circuit 222 according to the output voltage of the wireless receiving circuit detected by the detection circuit 234, so that the first communication control circuit 222 adjusts the wireless transmission according to the output voltage of the wireless receiving circuit.
  • the transmission power of the circuit 221 may include: during the trickle charging phase of the battery 232, the second communication control circuit 235 performs wireless communication with the first communication control circuit 222 according to the detected output voltage of the wireless receiving circuit, so that the first communication control
  • the circuit 222 adjusts the transmitting power of the wireless transmitting circuit 221 so that the output current of the first charging channel 233 matches the charging current corresponding to the trickle charging stage (or, so that the output current of the first charging channel 233 meets the requirements of the battery 232 in the trickle charging Phase of the demand for charging current).
  • the indication information may include the difference between the output voltage of the wireless receiving circuit and the target voltage.
  • the second communication control circuit 222 can determine the current charging stage of the battery 232 according to the current power and/or current voltage of the battery 232, and then determine the wireless reception that matches the charging voltage and/or charging current currently required by the battery 232 The output voltage of the circuit; then the second communication control circuit 222 can compare the current output voltage of the wireless receiving circuit with the target voltage to determine whether the output voltage of the wireless receiving circuit matches the current required charging current of the battery, and the wireless receiving When the output voltage of the circuit does not match the charging current required by the battery, the instruction information is sent to the first communication control circuit to instruct the first communication control circuit to adjust the transmission power of the wireless transmitting circuit so that the output of the wireless receiving circuit The voltage matches the current required to charge the battery.
  • Fig. 7 is another example of the charging system provided by the embodiment of the present application.
  • the wireless charging signal transmitting device 220 corresponding to the embodiment of FIG. 7 does not obtain electric energy from the power supply device 210, but directly converts the externally input AC power (such as commercial power) into the above-mentioned wireless charging signal.
  • the wireless charging signal transmitting device 220 may further include a voltage conversion circuit 224 and a power supply circuit 225.
  • the power supply circuit 225 may be used to receive external AC power (such as commercial power), and generate the output voltage and output current of the power supply circuit 225 according to the AC power.
  • the power supply circuit 225 may rectify and/or filter the alternating current to obtain direct current or pulsating direct current, and transmit the direct current or pulsating direct current to the voltage conversion circuit 224.
  • the voltage conversion circuit 224 can be used to receive the output voltage of the power supply circuit 225 and convert the output voltage of the power supply circuit 225 to obtain the output voltage and output current of the voltage conversion circuit 224.
  • the wireless transmission circuit 221 can also be used to generate a wireless charging signal according to the output voltage and output current of the voltage conversion circuit 224.
  • the embodiment of the present application integrates an adapter-like function inside the wireless charging signal transmitting device 220, so that the wireless charging signal transmitting device 220 does not need to obtain power from an external power supply device, which improves the integration of the wireless charging signal transmitting device 220 It also reduces the number of devices required to realize the wireless charging process.
  • the embodiment of the present application may set different output voltage ranges of the wireless receiving circuit for different charging stages. For example, for the trickle charging stage, the charging current required by the device to be charged is small, and a smaller target voltage can be set; for the constant current charging stage, the charging current required by the device to be charged is larger, and a larger target voltage can be set .
  • the wireless charging signal transmitting device 220 may support the first wireless charging mode and the second wireless charging mode, and the wireless charging signal transmitting device 220 charges the device to be charged in the first wireless charging mode.
  • the transmitting device 220 which is faster than the wireless charging signal, charges the device to be charged in the second wireless charging mode.
  • the wireless charging signal transmitting device 220 working in the first wireless charging mode is full of the equipment to be charged with the same capacity The battery time is shorter.
  • the second wireless charging mode may be a so-called normal wireless charging mode, for example, may be a traditional wireless charging mode based on the QI standard, the PMA standard, or the A4WP standard.
  • the first wireless charging mode may be a fast wireless charging mode.
  • the normal wireless charging mode may refer to a wireless charging mode in which the transmitting power of the wireless charging signal transmitter 220 is small (usually less than 15W, and the commonly used transmitting power is 5W or 10W). In the normal wireless charging mode, you want to fully charge it. A large-capacity battery (such as a 3000 mAh battery) usually takes several hours; and in the fast wireless charging mode, the transmission power of the wireless charging signal transmitter 220 is relatively large (usually greater than or equal to 15W ).
  • the wireless charging signal transmitter 220 in the fast wireless charging mode requires a charging time to fully charge the battery with the same capacity, which can be significantly shortened and the charging speed is faster.
  • the wireless charging signal receiving device 230 further includes: a second charging channel 236.
  • the second charging channel 236 may be a wire.
  • a conversion circuit 237 may be provided on the second charging channel 236 to perform voltage control on the direct current output by the wireless receiving circuit 231 to obtain the output voltage and output current of the second charging channel 236 to charge the battery 232.
  • the conversion circuit 237 can be used in a step-down circuit, and output constant current and/or constant voltage electric energy. In other words, the conversion circuit 237 can be used to perform constant voltage and/or constant current control on the battery charging process.
  • the wireless transmitting circuit 221 can use a constant transmitting power to transmit an electromagnetic signal. After the wireless receiving circuit 231 receives the electromagnetic signal, it is processed by the conversion circuit 237 into a voltage and The current is also input to the battery 232 to charge the battery 232. It should be understood that, in some embodiments, constant transmission power does not necessarily mean that the transmission power remains completely unchanged, and it can vary within a certain range, for example, the transmission power is 7.5W and fluctuates 0.5W.
  • the second communication control circuit 235 is also used to compare the detected output voltage value of the rectifier circuit in the wireless receiving circuit with the target voltage to determine the error value, and then send the error value to Wireless charging signal transmitter 220.
  • the transmitting device of the wireless charging signal and the device to be charged can be wirelessly charged according to the Qi standard. Therefore, the data signal containing the above error value can be coupled to the coil of the wireless receiving circuit 231 to be sent to the coil of the wireless transmitting circuit 221 by means of signal modulation, and then transmitted to the first communication control circuit 222.
  • the first communication control circuit 222 adjusts the transmission parameters of the wireless transmission circuit 221, for example, the transmission voltage of the wireless transmission circuit, according to the information of the error data packet.
  • the charging method for charging the battery 232 through the first charging channel 233 is the first wireless charging mode
  • the charging method for charging the battery 232 through the second charging channel 236 is called the second wireless charging mode.
  • the wireless charging signal transmitter and the device to be charged can determine whether to use the first wireless charging mode or the second wireless charging mode to charge the battery 232 through handshake communication.
  • the maximum transmission power of the wireless transmission circuit 221 may be the first transmission power value.
  • the maximum transmission power of the wireless transmission circuit 221 may be the second transmission power value.
  • the first transmission power value is greater than the second transmission power value, and thus, the charging speed of the device to be charged in the first wireless charging mode is greater than the second wireless charging mode.
  • the second communication control circuit 235 can also be used to control the switching between the first charging channel 233 and the second charging channel 236.
  • a switch 238 can be provided on the first charging channel 233, and the second communication control circuit 235 can control the first charging channel 233 and the second charging channel 236 by controlling the on and off of the switch 238. Switch between.
  • the wireless charging signal transmitting device 220 may include a first wireless charging mode and a second wireless charging mode, and the wireless charging signal transmitting device 220 is to be charged in the first wireless charging mode.
  • the charging speed of 230 is faster than that of the wireless charging signal transmitting device 220 in the second wireless charging mode.
  • the device to be charged 230 can control the first charging channel 233 to work; when the wireless charging signal transmitter 220 uses the second wireless When the charging mode is that the battery in the device to be charged 230 is charged, the device to be charged 230 can control the second charging channel 236 to work.
  • the second communication control circuit 235 can switch between the first charging channel 233 and the second charging channel 236 according to the charging mode.
  • the second communication control circuit 235 controls the voltage conversion circuit 239 on the first charging channel 233 to work.
  • the second communication control circuit 235 controls the conversion circuit 237 on the second charging channel 236 to work.
  • the wireless charging signal transmitting device 220 may communicate with the wireless charging signal receiving device 230 to negotiate a charging mode between the wireless charging signal transmitting device 220 and the wireless charging signal receiving device 230.
  • the first communication control circuit 222 in the wireless charging signal transmitting device 220 and the second communication control circuit 235 in the wireless charging signal receiving device 230 can also exchange many other communication information.
  • the first communication control circuit 222 and the second communication control circuit 235 can exchange information for safety protection, anomaly detection, or fault handling, such as temperature information of the battery 232, entering overvoltage protection or overcurrent Information such as protection indication information, and power transmission efficiency information (the power transmission efficiency information can be used to indicate the power transmission efficiency between the wireless transmitting circuit 221 and the wireless receiving circuit 231).
  • the communication between the second communication control circuit 235 and the first communication control circuit 222 may be one-way communication or two-way communication, which is not specifically limited in the embodiment of the present application.
  • the function of the second communication control circuit can be implemented by the application processor of the wireless charging signal receiving device 230, thereby, the hardware cost can be saved. Alternatively, it can also be implemented by an independent control chip, which can improve the reliability of control.
  • the embodiment of the present application may integrate the wireless receiving circuit 232 and the voltage conversion circuit 239 in the same wireless charging chip, which can improve the integration of the device to be charged and simplify the implementation of the device to be charged.
  • the functions of traditional wireless charging chips can be expanded to support charging management functions.
  • the wireless receiving circuit converts the electromagnetic signal into an output voltage/output current of 10V/2A.
  • the embodiment of the present application may also use multiple battery cells connected in series to reduce the heat generated by the wireless transmitting circuit 221 and the wireless receiving circuit 231.
  • the embodiment of the present application in order to ensure the charging speed and alleviate the heating phenomenon of the wireless charging signal receiving device 230, the embodiment of the present application further reforms the internal battery structure of the wireless charging signal receiving device 230, and introduces Compared with the single-cell solution, if the multiple cells connected in series are to achieve the same charging speed, the charging current required by the multiple cells is 1/N of the charging current required by the single cell (N is The number of cells connected in series in the wireless charging signal receiving device 230). In other words, under the premise of ensuring the same charging speed, the embodiment of the present invention can greatly reduce the size of the charging current, thereby reducing the reception of wireless charging signals. The heat generated by the device 230 during the charging process.
  • the multi-segment cells may be cells with the same or similar specifications and parameters. Cells with the same or similar specifications are convenient for unified management, and selecting cells with the same or similar specifications and parameters can increase the number of cells. The overall performance and service life of the battery cell. Alternatively, the specifications and parameters of the multiple battery cells may be different or inconsistent. During the charging and/or power supply process, the voltage between the multiple battery cells can be balanced by the equalization circuit.
  • an equalization circuit can also be used to balance the voltages of the multi-cell cells.
  • the electric energy output by the first charging channel or the second charging channel can be used to charge the multiple battery cells connected in series.
  • a step-down circuit can be used to step down the voltage of the multi-cell cores to provide system power to the wireless charging signal receiving device 230, or a single cell can also be used to supply the system.
  • you need to supply power to the system during the charging process you can directly divide a path through the charging management circuit to supply power to the system.
  • the multi-cell battery can be balanced by the balance circuit.
  • the equalization circuit There are many ways to implement the equalization circuit. For example, you can connect a load at both ends of the cell to consume the power of the cell to keep it consistent with the power of other cells, so that the voltage of each cell is consistent.
  • the battery cell with a high battery charge can be used to charge the battery cell with a low battery charge for equalization until the voltage of each battery cell is consistent.
  • the charging process of the battery may include one or more of a trickle charging phase, a constant current charging phase, and a constant voltage charging phase.
  • a trickle charging phase in order to further increase the charging speed, by controlling the charging voltage and the charging current, the charging duration of the constant voltage charging stage is shortened or the constant voltage charging stage is eliminated. Therefore, compared with the charging process in the related art, the charging speed can be greatly improved.
  • a limit voltage Vn higher than the standard cut-off voltage of the battery is set, and a plurality of charging currents [I1, I2, I3,..., In] are set, n ⁇ 1.
  • the limit voltage Vn is related to the battery system, materials used, and so on.
  • Vn can be set to V0+ ⁇ V, for example, ⁇ V can take a value between 0.05V and 0.1V.
  • the value of the charging current I1, I2, ..., In is also related to the battery system and the materials used. For example, In may be 700 mA.
  • the battery capacity is determined. According to the relationship between the charging voltage, charging current, charging time and battery capacity, when the charging voltage is equal to the limit voltage Vn, the size of the charging current at different stages can be determined. In some embodiments, it is possible to set I1, I2, I3,... In, the difference between two adjacent charging currents is ⁇ I, for example, ⁇ I can take a value between 100mA and 1A.
  • the battery when the battery voltage is charged to the standard cut-off voltage, the battery is charged with a constant current with the charging current I1 until the battery voltage reaches the limit voltage Vn. Since the battery is charged at a constant current with the current I1, the voltage will drop after stopping. Therefore, the battery can be charged at a constant current with the current I2 until the battery voltage reaches the limit voltage Vn. Repeat the above steps until the charging current In of the last step is used to charge to the limit voltage Vn, then the charging can be stopped. Therefore, by setting the limit voltage Vn and the charging current in each stage, the constant voltage charging stage in the related technology can be omitted, and the charging time can be greatly saved.
  • each of the charging stages corresponds to a charging current, and the charging current corresponding to the previous charging stage of the adjacent charging stage is greater than the latter
  • the charging current corresponding to the charging phase each charging phase uses its corresponding charging current to charge the voltage of the battery to a limit voltage, and the limit voltage is greater than the standard cut-off voltage of the battery; when multiple charging phases When finished, stop charging.
  • the battery when the battery voltage is charged to the standard cut-off voltage, the battery is charged with a constant current with the charging current I1 until the battery voltage reaches the limit Voltage Vn. The battery is then charged with a constant current with the current I2 until the battery voltage reaches the limit voltage Vn.
  • Vn the charging current
  • the constant voltage charging will be stopped for a preset time or until the charging current is reduced to a preset value (for example, 100mA). Recharge.
  • the charging cut-off voltage can be increased and the duration of constant voltage charging can be reduced, the charging time can also be greatly saved compared with related technologies.
  • each of the charging stages corresponds to a charging current, and the charging current corresponding to the previous charging stage of the adjacent charging stage is greater than the latter
  • the charging current corresponding to the charging phase each charging phase uses its corresponding charging current to charge the voltage of the battery to a limit voltage, and the limit voltage is greater than the standard cut-off voltage of the battery;
  • the battery is charged with constant voltage until the charging current of the battery reaches the target constant voltage charging cut-off current or the charging duration reaches the preset duration, then the charging stops.
  • each battery cell can be independently charged according to the charging process described above.
  • the computer program product includes one or more computer instructions.
  • the computer may be a general-purpose computer, a dedicated computer, a computer network, or other programmable devices.
  • the computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be from a website site, computer, server or data center Transmission to another website, computer, server or data center via wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.).
  • the computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device including one or more available medium integrated servers, data centers, and the like.
  • the available media may be magnetic media (eg, floppy disk, hard disk, magnetic tape), optical media (eg, digital video disc (DVD)), or semiconductor media (eg, solid state disk (SSD)), etc. .
  • the disclosed system, device, and method may be implemented in other ways.
  • the device embodiments described above are only schematic.
  • the division of the unit is only a logical function division, and there may be other divisions in actual implementation, for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored, or not implemented.
  • the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, devices or units, and may be in electrical, mechanical, or other forms.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
  • each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units may be integrated into one unit.

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Abstract

提供一种无线充电控制方法和充电控制装置。无线充电控制方法包括：根据无线接收电路的输出电压，判断无线接收电路接收到的无线充电信号的功率能否达到电池当前所需的充电功率；当无线充电信号的功率不能达到电池当前所需的充电功率时，降低电池当前所需的充电功率。上述技术方案可以将无线接收电路的输出电压，作为判断无线充电信号的功率能够达到电池当前所需的充电功率的依据，并通过降低电池当前所需的充电功率来减小电池接收到的充电功率和电池所需要的充电功率之间的差值，有利于改善待充电设备在偏位之后对功率的请求，减小对信道资源的占用。

Description

无线充电控制方法和充电控制装置 技术领域
本申请涉及无线充电领域，更为具体地，涉及一种无线充电控制方法和充电控制装置。
背景技术
对待充电设备而言，有线充电方式需要使用充电线缆，导致充电准备阶段的操作繁琐。因此，无线充电方式越来越受到人们的青睐，越来越多的待充电设备都支持无线充电或无线传输等功能。
但是采用无线充电方式对待充电设备进行充电时，无线充电底座和待充电设备可能会发生偏位，导致无线充电底座发射的大部分无线充电信号不能被待充电设备接收到，导致充电效率变低。另外，由于给待充电设备的充电功率不足，待充电设备会一直占用通信信道请求功率，造成信道资源的浪费。因此，在无线充电过程中，如何确定待充电设备处于偏位状态，以及如何改善信道资源的浪费成为亟需解决的问题。
发明内容
本申请提供一种无线充电控制方法和充电控制装置，能够改善待充电设备在偏位状态下造成的信道资源的浪费。
第一方面，提供一种无线充电控制方法，包括：根据无线接收电路的输出电压，判断所述无线接收电路接收到的无线充电信号的功率能否达到电池当前所需的充电功率；当所述无线充电信号的功率不能达到所述电池当前所需的充电功率时，降低所述电池当前所需的充电功率。
第二方面，提供一种充电控制装置，包括：无线接收电路，用于接收无线充电信号；控制电路，用于执行以下操作：根据所述无线接收电路的输出电压，判断所述无线充电信号的功率能否达到电池当前所需的充电功率；当所述无线充电信号的功率不能达到所述电池当前所需的充电功率时，降低所述电池当前所需的充电功率。
本申请提供的技术方案，将无线接收电路的输出电压，作为判断无线充电信号的功率能够达到电池当前所需的充电功率的依据，也就是说，可以根据无线接收电路的输出电压判断待充电设备是否偏位，并在确定待充电设备处于偏位状态后，降低电池当前所需的充电功率。电池所需的充电功率降低之后，电池接收到的充电功率和电池所需要的充电功率之间的差值就会减小，有利于改善待充电设备在偏位之后对功率的请求，减小对信道资源的占用。
附图说明
图1是一种无线充电系统的示意图。
图2是本申请一个实施例提供的无线充电控制方法的示意性流程图。
图3是本申请一个实施例提供的无线充电系统的示意性结构图。
图4是本申请又一实施例提供的无线充电控制方法的示意性流程图。
图5是本申请一实施例提供的充电控制装置的示意性结构图。
图6是本申请又一实施例提供的无线充电系统的示意性结构图。
图7是本申请又一实施例提供的无线充电系统的示意性结构图。
图8是本申请又一实施例提供的无线充电系统的示意性结构图。
具体实施方式
传统的无线充电技术一般将电源提供设备(如适配器)与无线充电装置(如无线充电底座)相连，并通过该无线充电装置将电源提供设备的输出功率以无线的方式(如电磁波)传输至待充电设备，对待充电设备进行无线充电。
按照无线充电原理不同，无线充电方式主要分为磁耦合(或电磁感应)、磁共振以及无线电波三种方式。目前，主流的无线充电标准包括QI标准、电源实物联盟(power matters alliance，PMA)标准、无线电源联盟(alliance for wireless power，A4WP)。QI标准和PMA标准均采用磁耦合方式进行无线充电。A4WP标准采用磁共振方式进行无线充电。
下面结合图1，对一实施例的无线充电方式进行介绍。
如图1所示，无线充电系统包括电源提供设备110、无线充电信号的发射装置120以及充电控制装置130，其中发射装置120例如可以是无线充电底座，充电控制装置130可以指待充电设备，例如可以是终端。
电源提供设备110与发射装置120连接之后，会将电源提供设备110的输出电压和输出电流传输 至发射装置120。
发射装置120可以通过内部的无线发射电路121将电源提供设备110的输出电压和输出电流转换成无线充电信号(例如，电磁信号)进行发射。例如，该无线发射电路121可以将电源提供设备110的输出电流转换成交流电，并通过发射线圈或发射天线将该交流电转换成无线充电信号。
图1只是示例性地给出了无线充电系统的示意性结构图，但本申请实施例并不限于此。例如，发射装置120也可以是无线充电信号的发射装置，充电控制装置130也可以是无线充电信号的接收装置。无线充电信号的接收装置例如可以是具有无线充电信号接收功能的芯片，可以接收发射装置120发射的无线充电信号；该无线充电信号的接收装置也可以是待充电设备。
待充电设备包括但不限于：被设置成经由有线线路连接(如经由公共交换电话网络(public switched telephone network，PSTN)、数字用户线路(digital subscriber line，DSL)、数字电缆、直接电缆连接，以及/或另一数据连接/网络)和/或经由(例如，针对蜂窝网络、无线局域网(wireless local area network，WLAN)、诸如手持数字视频广播(digital video broadcasting handheld，DVB-H)网络的数字电视网络、卫星网络、调幅-调频(amplitude modulation-frequency modulation，AM-FM)广播发送器，以及/或另一通信终端的)无线接口接收/发送通信信号的装置。被设置成通过无线接口通信的终端可以被称为“无线通信终端”、“无线终端”以及/或“移动终端”。移动终端的示例包括，但不限于卫星或蜂窝电话；可以组合蜂窝无线电电话与数据处理、传真以及数据通信能力的个人通信系统(personal communication system，PCS)终端；可以包括无线电电话、寻呼机、因特网/内联网接入、Web浏览器、记事簿、日历以及/或全球定位系统(global positioning system,GPS)接收器的个人数字助理(personal digital assistant，PDA)；以及常规膝上型和/或掌上型接收器或包括无线电电话收发器的其它电子装置。在某些实施例中，待充电设备可指移动终端是设备或手持终端设备，如手机、pad等。在某些实施例中，本申请实施例提及的待充电设备可以是指芯片系统，在该实施例中，待充电设备的电池可以属于或也可以不属于该芯片系统。
另外，待充电设备还可以包括其他有充电需求的电子设备，例如电子书、无线耳机、智能穿戴设备、车载设备、移动电源(如充电宝、旅充等)、电子烟、无线鼠标、蓝牙音响以及有充电需求的家居设备，如台灯、书桌、电动牙刷等。
下面以无线充电信号的发射装置、待充电设备为例进行描述。
充电控制装置130可以通过无线接收电路131接收无线发射电路121发射的无线充电信号，并将该无线充电信号转换成无线接收电路131的输出电压和输出电流。例如，该无线接收电路131可以通过接收线圈或接收天线将无线发射电路121发射的无线充电信号转换成交流电，并对该交流电进行整流和/或滤波等操作，将该交流电转换成无线接收电路131的输出电压和输出电流。
在一些实施例中，在无线充电之前，发射装置120与充电控制装置130会预先协商无线发射电路121的发射功率。假设发射装置120与充电控制装置130之间协商的功率为5W，则无线接收电路131的输出电压和输出电流一般为5V和1A。假设发射装置120可与充电控制装置130之间协商的功率为10.8W，则无线接收电路131的输出电压和输出电流一般为9V和1.2A。
若无线接收电路131的输出电压并不适合直接加载到电池133两端，则是需要先经过充电控制装置130内的变换电路132进行恒压和/或恒流控制，以得到充电控制装置130内的电池133所预期的充电电压和/或充电电流。
变换电路132可用于对无线接收电路131的输出电压进行变换，以使得变换电路132的输出电压和/或输出电流满足电池133所预期的充电电压和/或充电电流的需求。
作为一种示例，该变换电路132例如可以是充电集成电路(integrated circuit，IC)，或者可以为电源管理电路。在电池133的充电过程中，变换电路132可用于对电池133的充电电压和/或充电电流进行管理。该变换电路132可以包含电压反馈功能，和/或，电流反馈功能，以实现对电池133的充电电压和/或充电电流的管理。
在一些实施例中，电池的充电过程可包括涓流充电阶段，恒流充电阶段和恒压充电阶段中的一个或者多个。在涓流充电阶段，变换电路132可利用电流反馈功能使得在涓流充电阶段进入到电池133的电流满足电池133所预期的充电电流大小(譬如第一充电电流)。在恒流充电阶段，变换电路132可利用电流反馈功能使得在恒流充电阶段进入电池133的电流满足电池133所预期的充电电流大小(譬如第二充电电流，该第二充电电流可大于第一充电电流)。在恒压充电阶段，变换电路132可利用电压反馈功能使得在恒压充电阶段加载到电池133两端的电压的大小满足电池133所预期的充电电压大小。
作为一种示例，当无线接收电路131的输出电压大于电池133所预期的充电电压时，变换电路132可用于对无线接收电路131的输出电压进行降压处理，以使降压转换后得到的充电电压满足电池 133所预期的充电电压需求。作为又一种示例，当无线接收电路131的输出电压小于电池133所预期的充电电压时，变换电路132可用于对无线接收电路131的输出电压进行升压处理，以使升压转换后得到的充电电压满足电池133所预期的充电电压需求。
作为又一示例，以无线接收电路131输出5V恒定电压为例，当电池133包括单个电芯时，变换电路132(例如Buck降压电路)可对无线接收电路131的输出电压进行降压处理，以使得降压后得到的充电电压满足电池133所预期的充电电压需求。
作为又一示例，以无线接收电路131输出5V恒定电压为例，当电池133包括相互串联的两节或两节以上电芯时，变换电路132(例如Boost升压电路)可对无线接收电路131的输出电压进行升压处理，以使得升压后得到的充电电压满足电池133所预期的充电电压需求。
在正常的充电过程中，电池所需的充电电压和/或充电电流在不同的充电阶段可能在不断发生变化。无线接收电路的输出电压和/或输出电流可能就需要不断地调整，以满足电池当前的充电需求。电池在充电过程中，由于电池的电压在一段时间内基本上可以保持稳定，因此，电池的充电电压可以保持不变。随着电池所需的充电电流的不断增大，电池所需的充电功率也在不断增大。当电池所需的充电功率增大时，无线接收电路需要增大输出功率，以满足电池的充电需求。
当无线接收电路的输出功率小于电池当前所需的充电功率时，通信控制电路可以向发射装置发射指示信息以指示发射装置提升发射功率，以增大无线接收电路的输出功率。因此，在充电过程中，通信控制电路可以与发射装置通信，使得无线接收电路的输出功率能够满足电池不同充电阶段的充电需求。
通常情况下，发射装置是能够增大发射功率来满足电池的充电需求的。但是，在通过无线充电信号的发射装置为待充电设备充电时，待充电设备可能会存在放偏的情况，也就是说，待充电设备的接收线圈没有与发射装置的发射线圈对准，存在一定的错位或偏移。发射线圈发射的无线充电信号不能完全被接收线圈接收到，导致充电效率降低。
另外，由于充电效率降低，待充电设备接收到的充电功率小于发射装置发射的充电功率，由于发射装置发射的充电功率是有上限的，当发射装置的发射功率达到该上限后，还不能满足电池的充电需求，待充电设备就会不停地要求发射装置提供更大的功率。具体地，待充电设备会不停地向发射装置发射指示信息，以指示增大输出功率。但是，发射装置的发射功率已经达到上限，不能继续增大，因此，即使待充电设备不停地请求增大功率，发射装置仍不能满足待充电设备的充电需求。并且，由于待充电设备不停地占用信道资源请求增大功率，还会造成信道资源的浪费。另外，待充电设备一直占用信道资源，导致不能进行正常的异物检测(foreigner objects debris，FOD)，影响FOD功能。
因此，亟需一种检测方式来避免待充电设备由于放偏造成对信道资源占用的现象。本申请实施例提供一种无线充电控制方法，能够改善无线充电对信道资源的浪费。
图2是本申请实施例提供的无线充电控制方法的示意性框图，图2所示的方法包括步骤S210-S220。
S210、根据无线接收电路的输出电压，判断无线接收电路接收到的无线充电信号的功率能否达到电池当前所需的充电功率。
在为电池进行充电的过程中，无线接收电路的充电功率通常需要与电池当前所需的充电功率相匹配，也就是说，无线接收电路的充电功率需要满足电池当前所需的充电功率，这样，待充电设备才能按照电池所需的充电功率为电池进行充电。
在无线充电过程中，无线接收电路的输出电流一般保持不变，例如，无线接收电路的输出电流与无线发射电路的输入电流通常是相等的。因此，可以通过无线接收电路的输出电压来反映无线接收电路的输出功率，无线接收电路的输出功率可以理解为无线接收电路接收到的无线充电信号的功率。进一步地，可以通过无线接收电路的输出电压来判断无线接收电路的输出功率是否能够达到电池当前所需的充电功率。
S220、当无线充电信号的功率不能达到电池当前所需的充电功率时，降低电池当前所需的充电功率。
如前文所述，当无线充电信号的功率不能满足电池当前所需的充电功率时，待充电设备可能会不断地请求无线充电信号的发射装置提高发射功率，以满足电池当前的充电需求。但是，存在一些特殊情况，如待充电设备放偏后，即使待充电设备不断地请求增大发射功率，但发射装置的发射功率已经发射到最大值，没有办法继续增大。所以对于待充电设备的请求是徒劳的，待充电设备一直不断地向发射装置发射请求信息会一直占用通信频道，造成对信道资源的浪费，且也会影响待充电设备的FOD功能。
本申请实施例提供的技术方案，如果无线充电信号的功率不能满足电池当前所需的充电功率，则 可以将电池当前所需的充电功率降低。电池当前所需的充电功率降低后，电池接收到的充电功率与电池当前所需的充电功率之间的差值就会减小，有可能存在电池接收到的充电功率等于电池当前所需的充电功率的情况，也就是说，发射装置发射的充电功率能够满足电池当前对充电功率的需求。当发射装置发射的充电功率满足电池当前的充电需求时，待充电设备就不会请求发射装置增大充电功率，因此也就不会占用信道资源，能够减少信道资源的浪费。
可以理解的是，当无线充电信号的功率能否满足电池当前所需的充电功率，可以意味着待充电设备的处于偏位状态。因此，本申请实施例提供的技术方案还能够检测待充电设备是否偏位。
在一些实施例中，判断待充电设备是否放偏是通过检测无线充电信号的频率(或称谐振频率)的方式来实现。当待充电设备放偏后，发射装置的发射功率不能满足待充电设备的充电需求后，发射装置会通过改变无线充电信号的发射频率来调整发射装置的发射电压，因此，可以通过检测无线充电信号的频率来判断待充电设备是否放偏，但是这种方式仅适用于变频充电的情况，对于采用定频的无线充电方式并不适用。但本申请实施例提供的技术方案，根据无线接收电路的输出电压来判断待充电设备是否放偏，能够适用于采用定频方式对待充电设备充电的情况。当然，对于采用变频方式为待充电设备进行充电的方式也同样适用。
根据本申请实施例的方法确定待充电设备放偏后，除了可以通过降低电池当前所需的充电功率来改善无线充电过程外，还可以提示用户将待充电设备摆正以更好地对电池进行充电。例如，可以在待充电设备的界面显示提示信息，或者发送报警提示音，或者通过指示灯闪烁等方式提示用户将待充电设备摆正。
步骤210的实现方式有多种，本申请实施例对此不做具体限定。
作为一个示例，可以根据无线接收电路的输出电压以及输出电流，确定无线接收电路的输出功率，然后根据无线接收电路的输出功率与目标功率的差值，判断无线接收电路接收到的无线充电信号的功率能否满足电池当前所需的充电功率。如果无线接收电路的输出功率大于或等于目标功率，则可以确定无线接收电路接收到的无线充电信号的功率能满足电池当前所需的充电功率；如果无线接收电路的输出功率小于目标功率，则可以确定无线接收电路接收到的无线充电信号的功率不能满足电池当前所需的充电功率。
作为又一示例，可以根据无线接收电路的输出电压与期望的目标电压，来判断无线接收电路接收到的无线充电信号的功率能否满足电池当前所需的充电功率。如果无线接收电路的输出电压大于或等于目标电压，则可以确定无线接收电路接收到的无线充电信号的功率能满足电池当前所需的充电功率；如果无线接收电路的输出电压小于目标电压，则可以确定无线接收电路接收到的无线充电信号的功率不能满足电池当前所需的充电功率。
可选地，如果无线充电信号的功率在预设时间内不能达到电池当前所需的充电功率时，可以确定无线充电信号的功率不能满足电池当前所需的充电功率。该预设时间例如可以是30s或1分钟等。
在预设时间内无线充电信号的功率还是不能达到电池当前所需的充电功率，可以意味着无线充电信号的功率经过调整后，还是不能达到电池所需的充电功率。例如，在该预设时间内，无线接收电路和发射装置经过通信后，无线接收电路的输出功率还是没有达到电池所需的充电功率，此时可以确定无线充电信号的充电功率不能达到电池所需的充电功率。
期望的目标电压可以是电池当前期望的无线接收电路的输出电压，换句话说，期望的目标电压可以是与电池当前所需的充电电压和/或充电电流相匹配的无线接收电路的输出电压。
当无线接收电路实际的输出电压未达到期望的目标电压时，可以向发射装置发射指示信息，以指示发射装置提升发射电压；在指示发射装置提升发射电压之后，如果无线接收电路的输出电压仍不能达到目标电压，则可以确定无线充电信号的功率不能达到电池当前所需的充电功率。
如果在指示发射装置提升发射电压后，无线接收电路的输出电压还是不能达到目标电压，则可以确定发射装置的发射电压已经达到最大，不能继续升高，无线接收电路的输出电压不能满足电池对充电功率的需求，可以降低电池所需的充电功率。
如果仅向发射装置发送了一次指示提升发射电压的指示信息，发射装置升高了发射电压，升高之后的发射电压还是不能使得无线接收电路的输出电压达到目标电压，但并不意味发射装置的发射电压不能继续增大，只是发射装置在一次通信过程中仅升高了一定大小的发射电压。因此，可以多次指示发射装置提升发射电压，例如，向发射装置发送至少两次的指示信息，以指示提升发射电压。在正常情况下，在多次指示发射装置提升发射电压后，无线接收电路的输出电压是能够达到目标电压。但是如果在多次指示发射装置提升发射电压之后，无线接收电路的输出电压仍不能达到目标电压，可以确定待充电设备放偏，此时再确定无线充电信号的功率不能达到电池当前所需的充电功率，能够提高判断结果的准确性。
由于在无线充电的过程中，电池所需的充电电压和/或充电电流可能会发生变化，造成电池所需要的充电电压和/或充电电流升高，可能会存在某个时刻，无线接收电路的输出电压没有达到目标电压，但这种情况并不是由于待充电设备放偏造成的。实际上，无线接收电路的输出电压还是能够继续增大的，因此，可以向发射装置指示提升发射电压，如果在指示发射装置提升发射电压之后，无线接收电路的输出电压能够达到目标电压，则可以继续对电池进行充电。如果在多次指示发射装置提升发射电压之后，无线接收电路的输出电压还是不能达到目标电压，表示发射装置的发射功率已经达到最大，不能继续增大了，然后可以确定为无线充电信号的功率不能达到电池当前所需的充电功率，降低电池当前所需的充电功率，这种判断方式能够提高判断的准确性。
当然，除了上述方式外，当无线接收电路实际的输出电压未达到期望的目标电压时，也可以直接确定无线充电信号的功率不能达到电池当前所需的充电功率，本申请实施例对此不做具体限定。
本申请实施例对指示信息的内容不做具体限定，例如该指示信息可以直接指示无线接收电路的输出电压，或者该指示信息可指示目标电压与无线接收电路的输出电压之间的差值，或者，该指示信息可以指示无线接收电路的输出电压和目标电压。当然，该指示信息也可以指示上述内容的任意组合，本申请实施例对此不做具体限定。
可选地，该指示信息可以承载在控制误差数据包(control error packet，CEP)中。
本申请实施例可以将目标电压直接配置给发射装置，这种情况下，待充电设备可以仅将无线接收电路的输出电压发送给发射装置，由发射装置再进一步根据无线接收电路的输出电压与目标电压之间的差值调整发射装置的发射电压。
作为另一种实现方式，待充电设备可以将无线接收电路的输出电压与目标电压之间的差值上报给发射装置。当无线接收电路的输出电压小于目标电压时，无线接收电路需要增大其输出电压以达到目标电压，而无线接收电路的输出电压是由无线发射电路的发射电压决定的，因此可以通过增大无线发射电路的发射电压来使无线接收电路的输出电压达到目标电压。发射装置接收到指示信息后，可以根据无线接收电路的输出电压与目标电压之间的差值来增大无线发射电路的发射电压。
待充电设备向发射装置上报无线接收电路的输出电压与目标电压之间的差值可以是通过CEP上报，换句话说，待充电设备可以向发射装置发送CEP，该CEP中可以包括无线接收电路的输出电压与目标电压之间的差值。
本申请实施例对降低电池当前所需的充电功率的方式不做具体限定。
例如，可以直接将电池当前所需的充电功率降低到很小，以使得无线充电信号的功率能够满足电池当前所需的充电功率。降低电池当前所需的充电功率可以通过降低电池当前所需的充电电流来实现。
又例如，可以采用逐步降电流的方式来逐步降低电池所需的充电功率。具体地，可以采用每次降低一定电流值的方式，降低电池所需的充电功率。
下面对通过降电流的方式来实现无线接收电路的输出功率达到期望的目标电压的过程进行详细描述。
本申请实施例提供的方案可以适用于采用升压提流的方式对电池进行充电，下面结合图3进行描述。
通常情况下，电池的电压在一段时间内是保持不变的，因此，电池的充电的电压也可以保持不变，当电池所需的充电的电流增大时，也意味着电池所需的充电功率增大。电池所需的充电功率增大，需要无线接收电路的输出功率增大。由于电源提供设备的输出电流是基本保持不变的，也就意味着无线接收电路的输出电流也基本保持不变。因此，可以通过增大无线接收电路的输出电压来增大输出功率。无线接收电路的输出电压的增大可以通过增大电源提供设备的输出电压来实现。电源提供设备可以通过增大输出电压来增大输出功率，以满足电池对充电功率的需求。这种通过增大电源提供设备的输出电压来增大电池的充电电流的方式可以称为升压提流过程。
由上可知，在正常情况下，可以通过指示发射电路增大发射电压来增大电池的充电电流。如果待充电设备没有放偏，无线发射电路的发射电压是能够满足电池的最大充电电流需求的。
当待充电设备放偏后，无线接收电路接收到的功率小于无线发射电路发射的功率，在无线发射电路的发射功率达到上限后，可能会存在无线接收电路提供给电池的充电电流仍然小于电池当前所需要的充电电流的情况。
举例说明，如果发射装置发射的功率为15W，对应的发射电压和发射电流为15V和1A，由于待充电设备偏置，导致无线接收电路接收到的功率仅为12W，对应的输出电压和输出电流为12V和1A。假设当前电池所需的充电电压和充电电流为15V和1A，为了能够以15V和1A的充电电压和充电电流为电池进行充电，无线接收电路期望的输出电压为15V，电池所需的充电电流1A与无线接收电路 的输出电压15V对应。由于无线接收电路接收到的充电功率小于电池当前所需的充电功率，待充电设备可能按照15V和0.8A的充电电压和充电电流为电池进行充电。因此，由于无线接收电路的输出电压12V小于期望的目标电压15V，无线接收电路的输出电压达不到目标电压，导致电池的充电电流0.8A小于电池所需的充电电流1A。
但是如果充电系统没有将这种情况确定为是待充电设备放偏造成的，而是仍然按照正常的充电流程进行充电的话，由于无线接收电路的输出电压小于目标电压，待充电设备会一直向发射装置发射CEP，指示发射装置增大发射电压，这会造成对通信频道资源的占用。
本申请实施例提供的方案，可以通过降低电池所需要的充电电流来减小目标电压，以减小无线接收电路的输出电压与目标电压之间的差值。一种方案是可以直接将电池所需要的充电电流降到最小，使得目标电压小于或等于无线接收电路的输出电压。另一种方案是可以采用逐步降电流的方式来降低电池所需要的充电电流，例如，可以每次降低电池所需的充电电流100mA。具体地，如果无线接收电路的输出电压与目标电压的差值连续多次都不为0，例如，如果连续10次都不为0，则可以将电池所需的充电电流降低100mA，然后继续对无线接收电路的输出电压进行检测，如果无线接收电路的输出电压与目标电压的差值为0，则可以以当前的充电电流对电池进行充电；如果降低电池所需的充电电流之后，无线接收电路的输出电压与目标电压的差值仍多次都不为0，则可以继续将电池所需的充电的电流降低100mA，如此循环，直至无线接收电路的输出电压与目标电压的差值为0。这种方式可以在逐步降低电池所需充电电流的过程中，寻找到无线接收电路的输出电压等于目标电压的临界点，使得无线接收电路能够以最大的充电电流为电池进行充电。
当无线接收电路的输出电压与目标电压之间的差异较大时，可以将电池所需的充电电流进行大范围的调整；当该差异较小时，可以将电池所需的充电电流进行小范围的调整。
例如，待充电设备可以为电池所需的充电电流设置多个档位，当确定无线接收电路的输出电压与目标电压的差值较大时，可以将电池所需的充电电流的档位调整至少2格，每格档位的电流值可以为固定值，例如，50mA、100mA等；当无线接收电路的输出电压与目标电压的差值较小时，可以将电池所需的充电电流的档位调整一格。
举例说明，当无线接收电路的输出电压小于目标电压2V时，可以将电池所需的充电电流的档位调整两格；当无线接收电路的输出电压小于目标电压1V时，可以将电池所需的充电电流的档位调整一格。
仍以发射装置发射的功率为15W，无线接收电路接收到的功率为12W为例，无线接收电路的输出电压为12V，小于目标电压15V，电流当前所需的充电电流为1A。在降低电池所需的充电电流的过程中，例如，电池所需的充电电流从1A降低为0.8A，对应地，目标电压从15V降低到12V，由于无线接收电路当前的输出电压为12V，所以无线接收电路的输出电压等于目标电压，待充电设备可以不再指示发射装置提升输出功率，减少对信道资源的占用。
在发射装置的发射功率达到上限后，如果一直按照这种状态对电池进行充电，会导致发射装置满负荷工作，损耗比较大，且发热也较严重。本申请实施例提供的技术方案，由于在降低电池所需的充电电流的过程中，电池的充电电流可能会降低，由于电池的充电电压在一段时间内不会发生改变，因此电池的充电功率可能会降低。在待充电设备的充电功率降低之后，发射装置的输出功率也可以相应地降低，这样能够避免发射装置一直处于满负荷工作，降低发射装置的发热。
在降低电池所需的充电电流，为电池进行充电的过程中，待充电设备可能会存在摆正或者充电效率改善的情况，例如，待充电设备的接收线圈与发射装置的发射线圈对准，或者待充电设备的接收线圈与发射装置的发射线圈的偏移在可接受范围内，在该可接受范围内，不会影响发射装置对待充电设备的充电。又例如，待充电设备的接收线圈与发射装置的发射线圈虽然没有对准，但是无线接收电路的接收效率增大。如果继续以小电流为电池进行充电，可能会造成充电速度过慢的问题。因此，本申请实施例还提供一种无线充电的控制方法，能够在待充电设备摆正后，以最大的充电电流为电池进行充电。
在降低电池所需的充电电流后，继续对无线接收电路的输出电压进行检测，确定无线接收电路的输出电压与目标电压之间的差值。在多次检测到无线接收电路的输出电压与目标电压之间的差值都为0的情况下，例如，如果连续3次检测到无线接收电路的输出电压与目标电压之间的差值都为0，则可以提高电池所需的充电电流。例如，可以将电池所需的充电的电流升高至目标电流，如果升高电池所需的充电电流之后，无线接收电路的输出电压能够等于目标电压，则可以按照该升高之后的充电电流为电池进行充电，这样能够提高充电速度。
可选地，该目标电流可以电池所需的最大充电电流。
本申请实施例对将电池所需的充电电流升高至目标电流的方式不做具体限定。例如，可以一次直 接将电池所需的充电的电流升高至目标电流。又例如，也可以采用每次升高一定电流值的方式，如每次升高50mA电流的方式，将电池所需的充电电流升高至目标电流。
下面对升高电池所需的充电电流的方式进行详细描述。
升高电池所需的充电电流可以是一次直接升到最大充电电流，例如，无线接收电路可以对CEP进行检测，在多次检测到CEP中的无线接收电路的输出电压与目标电压之间的差值为0的情况下，可以直接将电池所需的充电电流升高至最大的充电的电流。如果升高电池所需的充电电流之后，无线接收电路的输出电压与目标电压之间的差值的值还是为0，则可以以升高之后的充电的电流为电池进行充电。如果升高电池所需的充电电流之后，无线接收电路的输出电压与目标电压之间的差值的值不为0，则可以将电池当前所需的充电电流维持在当前电流。
升高电池所需的充电电流也可以是采用逐步升电流的方式来逐步升高电池所需的充电电流。例如，无线接收电路可以对CEP进行检测，在多次检测到CEP中的无线接收电路的输出电压与目标电压之间的差值为0的情况下，可以采用每次升高一个较小的电流的方式提高电池所需的充电电流。例如，可以每隔20s，升高电流50mA。具体地，如果连续多个CEP中的无线接收电路的输出电压与目标电压之间的差值均为0，可以将电池所需的充电电流升高50mA，然后可以继续对无线接收电路的输出电压进行检测。如果升高电池所需的充电电流之后，无线接收电路的输出电压与目标电压之间的差值不为0，则将电池所需的充电电流降为升高之前的充电电流。如果在20s之后，CEP中的无线接收电路的输出电压与目标电压之间的差值仍为0，则可以继续将电池所需的充电电流升高50mA，依次类推，直至将电池所需的充电电流升高至最大充电电流。这种方式不仅可以在待充电设备从偏移状态摆正后，可以以最大的充电电流对电池进行充电。还可以在待充电设备虽然没有摆正，但是调整了偏移距离的情况下，仍然能够以尽可能大的充电电流对电池进行充电。
下面结合附图4，对本申请实施例提供的无线充电控制方法进行详细的描述。
S401、待充电设备与发射装置连接后，发射装置开始为待充电设备进行充电。发射装置可以采用升压提流的方式为待充电设备进行充电，直到电池的充电电流达到最大。电池的充电电流达到最大可以指电池的充电电流在很长一段时间内都保持不变，没有增大。具体的升压提流的过程可以参见上文的描述。
S402、对CEP中的无线接收电路的输出电压与目标电压的差值进行检测，判断该差值是否连续多次都为0。
S403、如果该差值连续多次都不为0，例如，连续2次或2次以上检测到CEP中的无线接收电路的输出电压与目标电压之间的压差不为0，表示电源提供设备的输出电压已经达到上限，也就是说，无线接收电路的输出电压达到最大值，没有办法继续增大了。这种情况也意味着待充电设备放偏，导致无线接收电路的输出电压不能满足电池的充电需求。
S404、降低电池当前所需的充电电流。例如，可以将电池所需的充电电流降低100mA。
S405、降低电池所需的充电电流后，继续检测CEP中的无线接收电路的输出电压与目标电压的差值，判断该差值是否为0。如果该差值连续多次都不为0，例如连续两次或两次以上都不为0，表明无线接收电路的输出电压仍不能满足电池的充电需求。此时可以继续降低电池所需的充电电流100mA，直到压差为0。
S406、如果CEP中的无线接收电路的输出电压与目标电压的差值连续多次都为0，表示无线接收电路的输出电压能够满足电池当前的充电需求。此时可以尝试升高电池所需的充电电流，以尽可能大的充电电流为电池进行充电，提高充电速度。例如，可以每隔20s，升高电池所需的充电电流50mA。
S407、如果升高电池所需的充电电流之后，无线接收电路的输出电压与目标电压的差值还是为0，表示待充电设备已经摆正。此时可以继续升高电池所需的充电电流，直到升高至电池所需的最大充电电流。
S408、如果升高电池所需的充电电流之后，无线接收电路的输出电压与目标电压的差值不为0，表示升高电池所需的充电电流之后，无线接收电路的输出电压不能满足电池的充电需求，待充电设备还没有摆正，此时可以退回到之前的充电状态，将电池当前所需的充电电流位置在当前的充电电流。
上文详细描述了本申请实施例提供的无线充电控制方法，下面结合图5-图8，对本申请实施例的充电控制装置进行描述。应理解，方法实施例的特征同样适用于装置实施例。装置实施例与方法实施例相互对应，因此未详细描述的部分可以参见前面各方法实施例。
图5所示的充电系统可以包括发射装置220和充电控制装置230。该充电控制装置可以指上文描述的待充电设备，该充电控制装置也可以称为无线充电信号的接收装置。
发射装置220可以包括无线发射电路221，无线发射电路221可用于发射无线充电信号，以对电池232进行充电。在一些实施例中，无线发射电路221可包括无线发射驱动电路和发射线圈(或发射 天线)。无线发射驱动电路可用于生成较高频率的交流电，发射线圈或发射天线可用于将该较高频率的交流电转换成电磁信号发射出去。
充电控制装置230可以包括无线接收电路231和通信控制电路235。
无线接收电路231可用于接收无线发射电路221发射的无线充电信号，并将无线充电信号转换成无线接收电路的输出电压和输出电流。
通信控制电路235可以具有通信功能，可用于在无线充电的过程中与发射装置220进行通信。更为具体地，通信控制电路235可用于根据无线接收电路的输出电压与发射装置220进行通信。
通信控制电路235可用于执行以下操作：根据无线接收电路231的输出电压，判断无线充电信号的功率能否达到电池当前所需的充电功率；当无线充电信号的功率不能达到电池232当前所需的充电功率时，降低电池232当前所需的充电功率。可选地，通信控制电路235中的控制功能例如可以通过微控制单元(micro control unit，MCU)实现。
可选地，通信控制电路235可用于根据无线接收电路231的输出电压，判断无线接收电路231的输出电压能否达到期望的目标电压；当无线接收电路231的输出电压不能达到目标电压时，确定无线接收电路231接收到的无线充电信号的功率不能达到电池当前所需的充电功率。
其中，该目标电压可以是与电池当前所需的充电功率相匹配的无线接收电路的输出电压。
充电控制装置230还可以包括检测电路，该检测电路可用于对无线接收电路231的输出电压进行检测。通信控制电路235可以将检测到的输出电压与目标电压进行比较，在无线接收电路231的输出电压小于目标电压的情况下，向发射装置220发射指示信息，指示发射装置220提升无线发射电路221的发射电压，以减小无线接收电路231的输出电压与目标电压之间的差值。如果通信控制电路235在多次，例如至少2次指示发射装置220提升发射电压后，无线接收电路的输出电压还是不能达到目标电压，则通信控制电路235可以确定无线充电信号的充电功率不能达到电池当前所需的充电功率，此时通信控制电路235可以确定待充电设备处于偏移的状态。
可选地，通信控制电路235还可以在无线充电信号的功率在预设时间内不能达到电池所需的充电功率时，降低电池所需的充电功率。
本申请实施例对指示信息的内容不做具体限定，该指示信息可以包括无线接收电路的输出电压，或者该指示信息包括无线接收电路的输出电压与目标电压之间的差值，或者该指示信息可以包括无线接收电路的输出电压和目标电压。当然，该指示信息的内容也可以包括上述内容的任意组合。
可选地，该指示信息可以承载在CEP中。
可选地，降低所述电池232当前所需的充电功率可以通过降低电池232所需的充电电流来实现。由于电池在充电过程中，电池的电压在一段时间内基本不会发生变化，所以电池所需的充电的电压也基本不会发生变化。因此，可以通过降低电池所需的充电电流来降低电池所需的充电功率。
降低电池所需的充电电流的方式可以由多种，例如，可以直接将电池所需的充电电流降低到最小充电电流，由于电池所需的充电电流与目标电压之间有对应关系，电池所需的充电电流降低之后，目标电压也相应地也会降低。所以将电池的充电电流降低到最小充电电流之后，使得无线接收电路的输出电压能够达到目标电压，即无线充电信号的功率能够满足所述电池当前所需的充电电流。又例如，可以采用逐步降低所述电池当前所需的充电电流的方式，例如，可以采用每次降低一定电流值的方式降低电池当前所需的充电电流，直到所述无线充电信号的功率能够满足所述电池当前所需的充电电流。
可选地，通信控制电路235可以根据无线接收电路231的输出电压与目标电压之间的差值，降低电池232所需的充电电流。当通信控制电路235确定无线接收电路231的输出电压与目标电压之间的差值较大时，可以将电池232所需的充电电流进行较大的调整；当通信控制电路235确定无线接收电路231的输出电压与目标电压之间的差值较小时，可以将电池232所需的充电的电流进行较小的调整。
例如，充电控制装置230可以为电池232所需的充电电流设置多个档位，当通信控制电路235确定无线接收电路231的输出电压与目标电压的差值较大时，可以将电池232所需的充电电流降低多个档位，每格档位的电流值可以为固定值，例如，50mA、100mA等；当通信控制电路235无线接收电路231的输出电压与目标电压的差值较小时，可以将电池232所需的充电电流的档位降低一个档位。
在降低电池230所需的充电电流之后，充电控制装置230可能存在摆正的情况，此时如果再以较小的充电的电流进行充电的话，会造成充电速度过慢的情况。因此，可以在降低电池所需的充电功率之后，可以尝试升高电池所需的充电电流。如果升高电池所需的充电电流之后，无线接收电路231的输出电压能够达到目标电压，则可以以升高之后的充电电流对电池232进行充电。
本申请实施例对升高电池所需的充电电流的方式不做具体限定，例如，可以直接将电池所需的充电电流升高至目标电流。又例如，也可以按照逐步升电流的方式将电池所需的充电电流升高至目标电 流，如可以按照每次升高一定电流值的方式将电池所需的充电电流升高至目标电流。
可选地，该目标电流可以是电池所需的最大充电电流。
例如，在降低电池232当前所需的充电功率之后，继续对无线接收电路231的输出电压进行检测，在检测到无线接收电路231的输出电压在很长一段时间内都能够达到目标电压，则可以升高电池所需的充电电流。在升高电池232所需的充电电流之后，检测无线接收电路231的输出电压，如果无线接收电路231的输出电压能够达到目标电压，则可以以升高之后的充电电流对电池232进行充电；如果无线接收电路231的输出电压不能达到目标电压，则维持之前的充电电流对电池232进行充电。
同降低电池所需的充电电流的方式类似，升高电池所需的充电电流可以是直接将电池所需的充电电流升高至最大充电电流，也可以是采用逐步升电流的方式升高，本申请实施例对此不做具体限定。且升高或降低电池所需的充电电流的方式可以参照上文方法侧实施例，此处不再赘述。
本申请实施例对通信控制电路235与发射装置220的通信方式不做具体限定。可选地，在一些实施例中，通信控制电路235与发射装置220可以采用蓝牙(bluetooth)通信、无线保真(wireless fidelity，Wi-Fi)通信或反向散射(backscatter)调制方式(或功率负载调制方式)通信、基于高载波频率的近距离无线通信、光通信、超声波通信、超宽带通信或移动通信等无线通信方式进行通信。
在一实施例中，基于高载波频率的近距离无线通信模块可以包括内部封装有极高频(extremely high frequency，EHF)天线的集成电路(integrated circuit，IC)芯片。可选地，高载波频率可以为60GHz。
在一实施例中，光通信可以是利用光通信模块进行通信。光通信模块可以包括红外通信模块，红外通信模块可利用红外线传输信息。
在一实施例中，移动通信可以是利用移动通信模块进行通信。移动通信模块可利用5G通信协议、4G通信协议或3G通信协议等移动通信协议进行信息传输。
采用上述的无线通信方式，相比于Qi标准中通过信号调制的方式耦合到无线接收电路的线圈进行通信的方式，可提高通信的可靠性，且可避免采用信号耦合方式通信带来的电压纹波，影响降压电路的电压处理过程。
可选地，通信控制电路235与发射装置220也可以采用数据接口的有线通信方式进行通信。
图6是本申请实施例提供的充电系统的另一示意图。请参见图6，无线充电信号的发射装置220还可以包括充电接口223，充电接口223可用于与外部的电源提供设备210相连。无线发射电路221还可用于根据电源提供设备210的输出电压和输出电流，生成无线充电信号。
第一通信控制电路222还可以在无线充电的过程中，调整无线发射电路221从电源提供设备210的输出功率中抽取的功率量，以调整无线发射电路221的发射功率，使得无线发射电路发射的功率能够满足电池的充电需求。例如，电源提供设备210也可以直接输出较大的固定功率(如40W)，第一通信控制电路222可以直接调整无线发射电路221从电源提供设备210提供的固定功率中抽取的功率量。
本申请实施例中，电源提供设备210的输出功率可以是固定的。例如，电源提供设备210可以直接输出较大的固定功率(如40W)，电源提供设备210可以按照该固定的输出功率向无线充电装置220提供输出电压和输出电流。在充电过程中，第一通信控制电路222可以根据实际需要从该电源提供设备的固定功率中抽取一定的功率量用于无线充电。也就是说，本申请实施例将无线发射电路221的发射功率调整的控制权分配给第一通信控制电路222，第一通信控制电路222能够在接收到第二通信控制电路235发送的指示信息之后立刻对无线发射电路221的发射功率进行调整，以满足电池当前的充电需求，具有调节速度快、效率高的优点。
本申请实施例对第一通信控制电路222从电源提供设备210提供的最大输出功率中抽取功率量的方式不做具体限定。例如，可以在无线充电信号的发射装置220内部设置电压转换电路224，该电压转换电路224可以与发射线圈或发射天线相连，用于调整发射线圈或发射天线接收到的功率。该电压转换电路224例如可以包括脉冲宽度调制(pulse width modulation，PWM)控制器和开关单元。第一通信控制电路222可以通过调整PWM控制器发出的控制信号的占空比调整无线发射电路221的发射功率。
本申请实施例对电源提供设备210的类型不做具体限定。例如，电源提供设备210可以为适配器、移动电源(power bank)、车载充电器或电脑等设备。
本申请实施例对充电接口223的类型不做具体限定。可选地，在一些实施例中，该充电接口223可以为USB接口。该USB接口例如可以是USB 2.0接口，micro USB接口，或USB TYPE-C接口。可选地，在另一些实施例中，该充电接口223还可以是lightning接口，或者其他任意类型的能够用于充电的并口和/或串口。
本申请实施例对第一通信控制电路222与电源提供设备210之间的通信方式不做具体限定。作为 一个示例，第一通信控制电路222可以通过除充电接口之外的其他通信接口与电源提供设备210相连，并通过该通信接口与电源提供设备210通信。作为另一个示例，第一通信控制电路222可以以无线的方式与电源提供设备210进行通信。例如，第一通信控制电路222可以与电源提供设备210进行近场通信(near field communication，NFC)。作为又一个示例，第一通信控制电路222可以通过充电接口223与电源提供设备210进行通信，而无需设置额外的通信接口或其他无线通信模块，这样可以简化无线充电装置220的实现。例如，充电接口223为USB接口，第一通信控制电路222可以与电源提供设备210基于该USB接口中的数据线(如D+和/或D-线)进行通信。又如，充电接口223可以为支持功率传输(power delivery，PD)通信协议的USB接口(如USB TYPE-C接口)，第一通信控制电路222与电源提供设备210可以基于PD通信协议进行通信。
可选地，第一通信控制电路222调整无线充电信号的发射功率可以指，第一通信控制电路222通过调整无线发射电路221的输入电压和/或输入电流来调整无线充电信号的发射功率。例如，第一通信控制电路可以通过增大无线发射电路的输入电压来增大无线发射电路的发射功率。
可选地，如图6所示，无线充电信号的接收装置230还包括第一充电通道233，通过该第一充电通道233可将无线接收电路231的输出电压和/或输出电流提供给电池232，对电池232进行充电。
可选地，第一充电通道233上还可以设置电压转换电路239，该电压转换电路239的输入端与无线接收电路231的输出端电连接，用于对无线接收电路231的输出电压进行恒压和/或恒流控制，以对电池232进行充电，使得电压转换电路239的输出电压和/或输出电流与电池当前所需的充电电压和/或充电电流相匹配。
可选地，增大无线发射电路221的发射功率可以指增大无线发射电路221的发射电压，增大无线发射电路221的发射电压可以通过增大电压转换电路224的输出电压来实现。例如，第一通信控制电路222接收到第二通信控制电路235发送的指示增大发射功率的指示信息后，可以通过增大电压转换电路224的输出电压来增大无线发射电路221的发射功率。
本申请实施例对第二通信控制电路235向第一通信控制电路222发送指示信息的方式不做具体限定。
例如，第二通信控制电路235可以定期向第一通信控制电路222发送指示信息。或者，第二通信控制电路235可以仅在无线接收电路的输出电压小于目标电压的情况下，再向第一通信控制电路222发送指示信息，如果无线接收电路231的输出电压等于目标电压，第二通信控制电路235可以不向第一通信控制电路222发送指示信息。
可选地，无线充电信号的接收装置还可包括检测电路234，该检测电路234可以检测无线接收电路231的输出电压，第二通信控制电路235可以根据无线接收电路231的输出电压，向第一通信控制电路222发送指示信息，以指示第一通信控制电路222调整无线发射电路221的发射功率，其中，该指示信息可以包括以下信息中的至少一种：无线接收电路的输出电压、目标电压、无线接收电路的输出电压与目标电压之间的差值。
在一实施例中，对待充电设备而言，在涓流充电的过程中，电池的电压会不断上升，电池所需的充电功率也会随之增大。此时，需要增大无线充电信号的发射功率，以满足电池当前的充电需求。在分段恒流充电的过程中，电池的充电电流可能会不断减小，电池所需的充电功率也会随之减小。此时，需要减小无线充电信号的发射功率，以满足电池当前的充电需求。
第一通信控制电路222可以根据指示信息调整无线充电信号的发射功率，可以指第一通信控制电路222调整无线充电信号的发射功率，使得无线充电信号的发射功率与电池的当前所需的充电电压和/或充电电流相匹配。
无线发射电路221的发射功率与电池232当前所需的充电电压和/或充电电流相匹配可以指：第一通信控制电路222对无线充电信号的发射功率的配置使得第一充电通道233的输出电压和/或输出电流与电池232当前所需的充电电压和/或充电电流相匹配(或者，第一通信控制电路222对无线充电信号的发射功率的配置使得第一充电通道233的输出电压和/或输出电流满足电池232的充电需求(包括电池232对充电电压和/或充电电流的需求))。
应理解，在本公开的一实施例中，“第一充电通道232的输出电压和/或输出电流与电池232当前所需的充电电压和/或充电电流相匹配”包括：第一充电通道232输出的直流电的电压值和/或电流值与电池232所需的充电电压值和/或充电电流值相等或在浮动预设范围(例如，电压值上下浮动100毫伏～200毫伏，电流值上下浮动0.001A～0.005A等)。
电池的充电过程可包括涓流充电阶段、恒流充电阶段和恒压充电阶段中的至少一个。
上述第二通信控制电路235根据检测电路234检测到的无线接收电路的输出电压，与第一通信控制电路222进行无线通信，以便第一通信控制电路222根据无线接收电路的输出电压，调整无线发射 电路221的发射功率可以包括：在电池232的涓流充电阶段，第二通信控制电路235根据检测到的无线接收电路的输出电压，与第一通信控制电路222进行无线通信，以便第一通信控制电路222调整无线发射电路221的发射功率，使得第一充电通道233的输出电流与涓流充电阶段对应的充电电流相匹配(或者，使得第一充电通道233的输出电流满足电池232在涓流充电阶段对充电电流的需求)。
可选地，指示信息可以包括无线接收电路的输出电压与目标电压之间的差值。第二通信控制电路222可以根据电池232的当前电量和/或当前电压，确定电池232当前所处的充电阶段，进而确定与电池232当前所需的充电电压和/或充电电流相匹配的无线接收电路的输出电压；然后第二通信控制电路222可以将无线接收电路当前的输出电压与目标电压进行比较，以确定无线接收电路的输出电压与电池当前所需的充电电流是否匹配，并在无线接收电路的输出电压与电池所需的充电电流不匹配的情况下，向第一通信控制电路发送指示信息，以指示第一通信控制电路对无线发射电路的发射功率进行调整，使得无线接收电路的输出电压与电池当前所需的充电的电流相匹配。
图7是本申请实施例提供的充电系统的的另一示例。图7的实施例对应的无线充电信号的发射装置220并非从电源提供设备210获取电能，而是直接将外部输入的交流电(如市电)转换成上述无线充电信号。
如图7所示，无线充电信号的发射装置220还可包括电压转换电路224和电源提供电路225。电源提供电路225可用于接收外部输入的交流电(如市电)，并根据交流电生成电源提供电路225的输出电压和输出电流。例如，电源提供电路225可以对交流电进行整流和/或滤波，得到直流电或脉动直流电，并将该直流电或脉动直流电传输至电压转换电路224。
电压转换电路224可用于接收电源提供电路225的输出电压，并对电源提供电路225的输出电压进行转换，得到电压转换电路224的输出电压和输出电流。无线发射电路221还可用于根据电压转换电路224的输出电压和输出电流，生成无线充电信号。
本申请实施例在无线充电信号的发射装置220内部集成了类似适配器的功能，使得该无线充电信号的发射装置220无需从外部的电源提供设备获取功率，提高了无线充电信号的发射装置220的集成度，并减少了实现无线充电过程所需的器件的数量。
可选地，本申请实施例可以为不同的充电阶段设置不同的无线接收电路的输出电压的范围。例如，对于涓流充电阶段，待充电设备所需的充电电流较小，可以设置较小目标电压；对于恒流充电阶段，待充电设备所需的充电电流较大，可以设置较大的目标电压。
可选地，在一些实施例中，无线充电信号的发射装置220可以支持第一无线充电模式和第二无线充电模式，无线充电信号的发射装置220在第一无线充电模式下对待充电设备的充电速度快于无线充电信号的发射装置220在第二无线充电模式下对待充电设备的充电速度。换句话说，相较于工作在第二无线充电模式下的无线充电信号的发射装置220来说，工作在第一无线充电模式下的无线充电信号的发射装置220充满相同容量的待充电设备中的电池的耗时更短。
第二无线充电模式可为称为普通无线充电模式，例如可以是传统的基于QI标准、PMA标准或A4WP标准的无线充电模式。第一无线充电模式可为快速无线充电模式。该普通无线充电模式可以指无线充电信号的发射装置220的发射功率较小(通常小于15W，常用的发射功率为5W或10W)的无线充电模式，在普通无线充电模式下想要完全充满一较大容量电池(如3000毫安时容量的电池)，通常需要花费数个小时的时间；而在快速无线充电模式下，无线充电信号的发射装置220的发射功率相对较大(通常大于或等于15W)。相较于普通无线充电模式而言，无线充电信号的发射装置220在快速无线充电模式下完全充满相同容量电池所需要的充电时间能够明显缩短、充电速度更快。
参见图8，在本公开的一实施例中，无线充电信号的接收装置230还包括：第二充电通道236。第二充电通道236可为导线。在第二充电通道236上可设置变换电路237，用于对无线接收电路231输出的直流电进行电压控制，得到第二充电通道236的输出电压和输出电流，以对电池232进行充电。
在一个实施例中，变换电路237可用于降压电路，并且输出恒流和/或恒压的电能。换句话说，该变换电路237可用于对电池的充电过程进行恒压和/或恒流控制。
当采用第二充电通道236对电池232进行充电时，无线发射电路221可采用恒定发射功率发射电磁信号，无线接收电路231接收电磁信号后，由变换电路237处理为满足电池232充电需求的电压和电流并输入电池232，实现对电池232的充电。应理解，在一些实施例中，恒定发射功率不一定是发射功率完全保持不变，其可在一定的范围内变动，例如，发射功率为7.5W上下浮动0.5W。
在该实施例中，第二通信控制电路235还用于根据检测到的无线接收电路中整流电路的输出电压值与目标电压进行比较，确定误差值，再将误差值通过数据包的形式发送给无线充电信号的发射装置220。
在一实施例中，通过第二充电通道236对电池232进行充电时，无线充电信号的发射装置和待充 电设备可按照Qi标准进行无线充电。由此，可通过信号调制的方式，将包含上述误差值的数据信号耦合到无线接收电路231的线圈以发送给无线发射电路221的线圈，再传输给第一通信控制电路222。第一通信控制电路222根据误差数据包的信息，调整无线发射电路221的发射参数，例如，无线发射电路的发射电压等。
在本公开的实施例中，通过第一充电通道233对电池232进行充电的充电方式为第一无线充电模式，通过第二充电通道236对电池232进行充电的方式称为第二无线充电模式。无线充电信号的发射装置和待充电设备可通过握手通信确定采用第一无线充电模式还是第二无线充电模式对电池232进行充电。
本公开实施例中，在无线充电装置侧，当通过第一无线充电模式对待充电设备充电时，无线发射电路221的最大发射功率可为第一发射功率值。而通过第二无线充电模式对待充电设备进行充电时，无线发射电路221的最大发射功率可为第二发射功率值。其中，第一发射功率值大于第二发射功率值，由此，采用第一无线充电模式对待充电设备的充电速度大于第二无线充电模式。
可选地，第二通信控制电路235还可用于控制第一充电通道233和第二充电通道236之间的切换。例如，如图8所示，第一充电通道233上可以设置开关238，第二通信控制电路235可以通过控制该开关238的导通与关断控制第一充电通道233和第二充电通道236之间的切换。上文指出，在某些实施例中，无线充电信号的发射装置220可以包括第一无线充电模式和第二无线充电模式，且无线充电信号的发射装置220在第一无线充电模式下对待充电设备230的充电速度快于无线充电信号的发射装置220在第二无线充电模式下对待充电设备230的充电速度。当无线充电信号的发射装置220使用第一无线充电模式为待充电设备230内的电池充电时，待充电设备230可以控制第一充电通道233工作；当无线充电信号的发射装置220使用第二无线充电模式为待充电设备230内的电池充电时，待充电设备230可以控制第二充电通道236工作。
在待充电设备侧，第二通信控制电路235可以根据充电模式，在第一充电通道233和第二充电通道236之间进行切换。当采用第一无线充电模式时，第二通信控制电路235控制第一充电通道233上的电压转换电路239工作。当采用第二无线充电模式时，第二通信控制电路235控制第二充电通道236上的变换电路237工作。
可选地，无线充电信号的发射装置220可以与无线充电信号的接收装置230之间进行通信，以协商无线充电信号的发射装置220与无线充电信号的接收装置230之间的充电模式。
除了上文描述的通信内容外，无线充电信号的发射装置220中的第一通信控制电路222与无线充电信号的接收装置230中的第二通信控制电路235之间还可以交互许多其他通信信息。在一些实施例中，第一通信控制电路222和第二通信控制电路235之间可以交互用于安全保护、异常检测或故障处理的信息，如电池232的温度信息，进入过压保护或过流保护的指示信息等信息，功率传输效率信息(该功率传输效率信息可用于指示无线发射电路221和无线接收电路231之间的功率传输效率)。
可选地，第二通信控制电路235与第一通信控制电路222之间的通信可以为单向通信，也可以为双向通信，本申请实施例对此不做具体限定。
在本申请的实施例中，第二通信控制电路的功能可由无线充电信号的接收装置230的应用处理器实现，由此，可以节省硬件成本。或者，也可由独立的控制芯片实现，由独立的控制芯片实现可提高控制的可靠性。
可选地，本申请实施例可以将无线接收电路232与电压转换电路239均集成在同一无线充电芯片中，这样可以提高待充电设备集成度，简化待充电设备的实现。例如，可以对传统无线充电芯片的功能进行扩展，使其支持充电管理功能。
本申请实施例提供的无线充电系统中的电池232可以包括一节电芯，也可以包括相互串联的N节电芯(N为大于1的正整数)。以N＝2为例，电池232可以包括第一电芯和第二电芯，且第一电芯和第二电芯相互串联。以充电功率等于20W，单节电芯的充电电压等于5V为例进行说明。为了满足串联双电芯对充电电压的要求，第一充电通道233的输出电压/输出电流需要维持在10V/2A。这样一来，无线发射电路基于10V/2A生成电磁信号，相应地，无线接收电路将电磁信号转换成10V/2A的输出电压/输出电流，由于电流从4A降低至2A，电能传输过程产生的热量就会相应降低。因此，本申请实施例也可以采用相互串联的多节电芯，以降低无线发射电路221和无线接收电路231产生的热量。
上文是以N＝2为例进行说明的，实际上，N的取值可以是3，也可以是3以上的正整数。相互串联的电芯越多，电能经过无线发射电路221和无线接收电路231所产生的热量就越小。
在本申请的一实施例中，为了保证充电速度，缓解无线充电信号的接收装置230的发热现象，本申请实施例对无线充电信号的接收装置230内部的电池结构进行了进一步的改造，引入了相互串联的 多节电芯，与单电芯方案相比，如果要达到同等的充电速度，多节电芯所需的充电电流为单节电芯所需的充电电流的1/N(N为无线充电信号的接收装置230内的相互串联的电芯的数目)，换句话说，在保证同等充电速度的前提下，本发明实施例可以大幅降低充电电流的大小，从而减少无线充电信号的接收装置230在充电过程的发热量。
本申请的一实施例中的多节电芯可以是规格、参数相同或相近的电芯，规格相同或相近的电芯便于统一管理，且选取规格、参数相同或相近的电芯能够提高多节电芯的整体性能和使用寿命。或者，多节电芯的规格和参数可以不相同或不一致，在充电和/或供电过程中，可以通过均衡电路来均衡多节电芯之间的电压。
当然，即使多节电芯的规格和参数均相同，也会存在电芯电压不一致的情况，在这种情况下，也可以使用均衡电路来均衡多节电芯的电压。
在充电的过程中，第一充电通道或第二充电通道输出的电能可用于对相互串联的多节电芯充电。在供电过程中，可采用降压电路将多节电芯的电压降压后对无线充电信号的接收装置230进行系统供电，或者也可采用单节电芯进行系统供电。此外，在充电过程中，如果需要对系统供电，可直接通过充电管理电路分一条通路，对系统进行供电。
为了保持多节电芯的电量均衡，在充放电过程中，可通过均衡电路对多节电芯进行电量均衡。均衡电路的实现方式很多，例如，可以在电芯两端连接负载，消耗电芯的电量，使其与其它电芯的电量保持一致，从而使得各个电芯的电压保持一致。或者，可以采用电量高的电芯为电量低的电芯充电的方式进行均衡，直到各个电芯的电压一致为止。
如前所述，电池的充电过程可包括涓流充电阶段、恒流充电阶段和恒压充电阶段中的一个或多个。在本申请的一实施例中，为了进一步提高充电速度，通过对充电电压和充电电流的控制，实现缩短恒压充电阶段的充电时长或去掉恒压充电阶段。从而，相比于相关技术中的充电过程，可极大地提高充电速度。
在一个实施例中，设置一高于电池的标准截止电压的限制电压Vn，以及设置多个充电电流[I1、I2、I3、……、In]，n≥1。其中，I1≥I2≥I3……。应理解，限制电压Vn跟电池的体系、采用的材料等相关。在一些实施例中，若电池的标准截止电压为V0，可将Vn设置为V0+△V，例如，△V可在0.05V到0.1V之间取值。充电电流I1、I2、……、In的值也跟电池的体系、采用的材料等相关。例如，In可为700mA。
当电池体系确定后，电池的容量确定，根据充电电压、充电电流、充电时间和电池容量的关系，当充电电压等于限制电压Vn时，可确定不同阶段的充电电流的大小。在一些实施例中，可设置I1、I2、I3……In中，相邻两个充电电流之间的差值均为△I，例如，△I可在100mA到1A之间进行取值。
在一些实施例中，无论是采用上述的第一充电通道，还是第二充电通道，当电池电压被充到标准截止电压时，以充电电流I1对电池进行恒流充电，直到电池电压达到限制电压Vn。由于电池以电流I1进行恒流充电，停止后电压会产生回落。因此，可以再对电池以电流I2进行恒流充电，直到电池电压达到限制电压Vn。重复以上步骤，直至使用最后一个步次充电电流In充电至限制电压Vn，则可停止充电。由此，通过设置限制电压Vn，以及各个阶段的充电电流，可省去相关技术中的恒压充电阶段，极大地节省充电时间。即：
当电池电压充至标准截止电压时，通过多个充电阶段对电池进行充电，每个所述充电阶段对应一个充电电流，且相邻所述充电阶段的前一充电阶段对应的充电电流大于后一充电阶段对应的充电电流，每个所述充电阶段使用其对应的充电电流将所述电池的电压充电至限制电压，所述限制电压大于所述电池的标准截止电压；当多个所述充电阶段完成时，停止充电。
在另一些实施例中，无论是采用上述的第一充电通道，还是第二充电通道，当电池电压被充到标准截止电压时，以充电电流I1对电池进行恒流充电，直到电池电压达到限制电压Vn。再对电池以电流I2进行恒流充电，直到电池电压达到限制电压Vn。重复以上步骤，直至使用最后一个步次充电电流In充电至限制电压Vn，则以Vn为充电电压，恒压充电预设时间或待充电电流减小到预设值(例如，100mA)，则停止充电。该实施例中由于能够提高充电截止电压，减小恒压充电的时长，由此，相比相关技术，也可极大的节省充电时间。
当电池电压充至标准截止电压时，通过多个充电阶段对电池进行充电，每个所述充电阶段对应一个充电电流，且相邻所述充电阶段的前一充电阶段对应的充电电流大于后一充电阶段对应的充电电流，每个所述充电阶段使用其对应的充电电流将所述电池的电压充电至限制电压，所述限制电压大于所述电池的标准截止电压；以所述限制电压对所述电池进行恒压充电，直到所述电池的充电电流达到目标恒压充电截止电流或充电时长达到预设时长，则充电停止。
当电池为多电芯时，上述方法中，需监测每一电芯的电压是否都达到标准截止电压和限制电压。 当有任一电芯的电压达到标准截止电压或限制电压时，执行充电电流的变换操作。或者，在一些实施例中，也可以将已经充满的电芯的充电通路断开，而继续对未充满的电芯执行充电。即，每一电芯都可独立按照上述的充电过程进行充电操作。
在上述实施例中，可以全部或部分地通过软件、硬件、固件或者其他任意组合来实现。当使用软件实现时，可以全部或部分地以计算机程序产品的形式实现。所述计算机程序产品包括一个或多个计算机指令。在计算机上加载和执行所述计算机程序指令时，全部或部分地产生按照本申请实施例所述的流程或功能。所述计算机可以是通用计算机、专用计算机、计算机网络、或者其他可编程装置。所述计算机指令可以存储在计算机可读存储介质中，或者从一个计算机可读存储介质向另一个计算机可读存储介质传输，例如，所述计算机指令可以从一个网站站点、计算机、服务器或数据中心通过有线(例如同轴电缆、光纤、数字用户线(digital subscriber line，DSL))或无线(例如红外、无线、微波等)方式向另一个网站站点、计算机、服务器或数据中心进行传输。所述计算机可读存储介质可以是计算机能够存取的任何可用介质或者是包含一个或多个可用介质集成的服务器、数据中心等数据存储设备。所述可用介质可以是磁性介质(例如，软盘、硬盘、磁带)、光介质(例如数字视频光盘(digital video disc，DVD))、或者半导体介质(例如固态硬盘(solid state disk，SSD))等。
本领域普通技术人员可以意识到，结合本文中所公开的实施例描述的各示例的单元及算法步骤，能够以电子硬件、或者计算机软件和电子硬件的结合来实现。这些功能究竟以硬件还是软件方式来执行，取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本申请的范围。
在本申请所提供的几个实施例中，应该理解到，所揭露的系统、装置和方法，可以通过其它的方式实现。例如，以上所描述的装置实施例仅仅是示意性的，例如，所述单元的划分，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式，例如多个单元或组件可以结合或者可以集成到另一个系统，或一些特征可以忽略，或不执行。另一点，所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口，装置或单元的间接耦合或通信连接，可以是电性，机械或其它的形式。
所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部单元来实现本实施例方案的目的。
另外，在本申请各个实施例中的各功能单元可以集成在一个处理单元中，也可以是各个单元单独物理存在，也可以两个或两个以上单元集成在一个单元中。
以上所述，仅为本申请的具体实施方式，但本申请的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本申请揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本申请的保护范围之内。因此，本申请的保护范围应以所述权利要求的保护范围为准。

Claims (24)

  1. 一种无线充电控制方法，其特征在于，包括：
    根据无线接收电路的输出电压，判断所述无线接收电路接收到的无线充电信号的功率能否达到电池当前所需的充电功率；
    当所述无线充电信号的功率不能达到所述电池当前所需的充电功率时，降低所述电池当前所需的充电功率。
  2. 根据权利要求1所述的方法，其特征在于，所述根据无线接收电路的输出电压，判断所述无线接收电路接收到的无线充电信号的功率能否达到电池当前所需的充电功率，包括：
    根据所述无线接收电路的输出电压，判断所述无线接收电路的输出电压能否达到期望的目标电压；
    当所述无线接收电路的输出电压不能达到所述目标电压时，确定所述无线接收电路接收到的无线充电信号的功率不能达到所述电池当前所需的充电功率。
  3. 根据权利要求1或2所述的方法，其特征在于，所述根据无线接收电路的输出电压，判断接收到的无线充电信号的功率能否达到所述电池当前所需的充电功率，包括：
    当所述无线接收电路的输出电压未达到期望的目标电压时，向所述无线充电信号的发射装置发送指示信息，指示所述发射装置提升发射电压；
    在指示所述发射装置提升发射电压之后，如果所述无线接收电路的输出电压仍不能达到所述目标电压，确定所述无线充电信号的功率不能达到所述电池当前所需的充电功率。
  4. 根据权利要求3所述的方法，其特征在于，所述在指示所述发射装置提升发射电压之后，如果所述无线接收电路的输出电压仍不能达到所述目标电压，确定所述无线充电信号的功率不能达到所述电池当前所需的充电功率包括：
    所述在经过至少两次指示所述发射装置提升发射电压之后，如果所述无线接收电路的输出电压仍不能达到所述目标电压，确定所述无线充电信号的功率不能达到所述电池当前所需的充电功率。
  5. 根据权利要求3或4所述的方法，其特征在于，所述指示信息用于指示所述目标电压与所述无线接收电路的输出电压之间的差值。
  6. 根据权利要求3-5中任一项所述的方法，其特征在于，所述指示信息承载在控制误差数据包CEP中。
  7. 根据权利要求2-6中任一项所述的方法，其特征在于，所述目标电压与所述电池当前所需的充电功率相匹配。
  8. 根据权利要求1-7中任一项所述的方法，其特征在于，所述当所述无线充电信号的功率不能达到所述电池当前所需的充电功率时，降低所述电池当前所需的充电功率包括：
    当所述无线充电信号的功率在预设时间内不能达到所述电池当前所需的充电功率时，降低所述电池当前所需的充电功率。
  9. 根据权利要求1-8中任一项所述的方法，其特征在于，所述降低所述电池当前所需的充电功率，包括：
    按照每次降低一定电流值的方式，降低所述电池当前所需的充电电流，直到所述无线充电信号的功率能够满足所述电池当前所需的充电功率。
  10. 根据权利要求1-9中任一项所述的方法，其特征在于，在所述降低所述电池当前所需的充电功率之后，所述方法还包括：
    将所述电池当前所需的充电电流从当前电流升高至目标电流；
    如果所述无线充电信号的功率不能满足所述目标电流，将所述电池当前所需的充电电流维持在所述当前电流。
  11. 根据权利要求10所述的方法，其特征在于，所述将所述电池当前所需的充电电流从当前电流升高至目标电流包括：
    按照每次升高一定电流值的方式，将所述电池当前所需的充电电流升高至所述目标电流。
  12. 根据权利要求10或11所述的方法，其特征在于，所述目标电流为所述电池所需的最大充电电流。
  13. 一种充电控制装置，其特征在于，包括：
    无线接收电路，用于接收无线充电信号；
    通信控制电路，用于执行以下操作：
    根据所述无线接收电路的输出电压，判断所述无线充电信号的功率能否达到电池当前所需的充电功率；
    当所述无线充电信号的功率不能达到所述电池当前所需的充电功率时，降低所述电池当前所需的充电功率。
  14. 根据权利要求13所述的充电控制装置，其特征在于，所述通信控制电路用于：
    根据所述无线接收电路的输出电压，判断所述无线接收电路的输出电压能否达到期望的目标电压；
    当所述无线接收电路的输出电压不能达到所述目标电压时，确定所述无线接收电路接收到的无线充电信号的功率不能达到所述电池当前所需的充电功率。
  15. 根据权利要求13或14所述的充电控制装置，其特征在于，所述通信控制电路用于：
    当所述无线接收电路的输出电压未达到期望的目标电压时，向所述无线充电信号的发射装置发送指示信息，指示所述发射装置提升发射电压；
    在指示所述发射装置提升发射电压之后，如果所述无线接收电路的输出电压仍不能达到所述目标电压，确定所述无线充电信号的功率不能达到所述电池当前所需的充电功率。
  16. 根据权利要求15所述的充电控制装置，其特征在于，所述通信控制电路用于：
    所述在经过至少两次指示所述发射装置提升发射电压之后，如果所述无线接收电路的输出电压仍不能达到所述目标电压，确定所述无线充电信号的功率不能达到所述电池当前所需的充电功率。
  17. 根据权利要求15或16所述的充电控制装置，其特征在于，所述指示信息用于指示所述目标电压与所述无线接收电路的输出电压之间的差值。
  18. 根据权利要求15-17中任一项所述的充电控制装置，其特征在于，所述指示信息承载在控制误差数据包CEP中。
  19. 根据权利要求14-18中任一项所述的充电控制装置，其特征在于，所述目标电压与所述电池当前所需的充电功率相匹配。
  20. 根据权利要求13-19中任一项所述的充电控制装置，其特征在于，所述通信控制电路用于：
    当所述无线充电信号的功率在预设时间内不能达到所述电池当前所需的充电功率时，降低所述电池当前所需的充电功率。
  21. 根据权利要求13-20中任一项所述的充电控制装置，其特征在于，所述通信控制电路用于：
    按照每次降低一定电流值的方式，降低所述电池当前所需的充电电流，直到所述无线充电信号的功率能够满足所述电池当前所需的充电功率。
  22. 根据权利要求13-21中任一项所述的充电控制装置，其特征在于，在所述降低所述电池当前所需的充电功率之后，所述通信控制电路还用于：
    将所述电池当前所需的充电电流从当前电流升高至目标电流；
    如果所述无线充电信号的功率不能满足所述目标电流，将所述电池当前所需的充电电流维持在所述当前电流。
  23. 根据权利要求22所述的充电控制装置，其特征在于，所述通信控制电路用于：
    按照每次升高一定电流值的方式，将所述电池当前所需的充电电流升高至所述目标电流。
  24. 根据权利要求22或23所述的充电控制装置，其特征在于，所述目标电流为所述电池所需的最大充电电流。
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