Patent Description:
Wireless charging technologies, especially wireless charging technologies of Wireless Power Consortium (WPC), are increasingly used in mobile terminals. For example, wearable devices have widely used the wireless charging technologies, and some phones also use the WPC wireless charging technology for charging. The USB PD (Universal Serial Bus Power Delivery) protocol is a protocol standardized by the USB Association to support more powerful charging. With the USB PD protocol and the Type C interface increasingly used in the mobile terminals, the chargers supporting the USB PD also become more and more popular.

In the related art, some wireless charging technologies support a charger with a Dedicated Charge Port (DCP). In such case, the wireless charging transmitter and the charger need to perform a Battery Charging Specification <NUM> (BC1. <NUM>) protocol detection, and the input voltage supported by BC1. <NUM> is only 5V. When using the voltage of 5V for charging, the charging power is limited. Some of the other wireless charging technologies support fixed voltage inputs, such as 9V or 12V. There are also some wireless charging technologies in which an encrypted authentication is performed between the wireless charging receiver (Rx) and the wireless charging transmitter, and fast wireless charging starts if the encryption authentication is passed. However, a large number of chargers on the market do not support the method of using a fixed voltage or using an encryption.

<CIT> discloses a wireless power system (WPS) having a wireless power transmitter (WPT) that appraises an input power available to a power inverter from one or more input power sources. The WPT comprises the power inverter that wirelessly transmits power to a wireless power receiver (WCR) of the WPS, and a power appraiser circuit (PAC). The PAC ascertains maximum input power available to the power inverter from the input power sources. The PAC includes a variable load connected to a path carrying the input power to the power inverter or one or more input pins that receive power ratings of the input power sources that indicate available maximum input power from the input power sources. The ascertaining of maximum input power available to the power inverter from the input power sources appraises the input power available to the power inverter. The WCR receives information representing maximum power deliverable by the WPT.

The present disclosure provides a method for wireless charging, and a power management apparatus.

According to a first aspect of the present disclosure, there is provided a method for wireless charging according to claim <NUM>.

According to a second aspect of the present disclosure, there is provided a power management apparatus according to claim <NUM>.

According to a third aspect of the present disclosure, there is provided a computer-readable storage medium according to claim <NUM>.

It is to be understood that both the foregoing general description and the following detailed description are exemplary only and are not restrictive of the present disclosure.

In this disclosure, the term "in response to a condition" may mean when a condition is met.

<FIG> is a schematic diagram of a wireless charging system according to an aspect of the disclosure. As shown in <FIG>, the wireless charging system includes: a charger, a wireless charging transmitter (Tx terminal), a wireless charging receiver (Rx terminal), and a power management apparatus. The charger may be a PD charger that supports the USB PD protocol. The charger and the wireless charging transmitter may be connected using a C to C cable. The wireless charging transmitter may include an inverter circuit, a communication and control circuit, and a Tx coil. The inverter circuit may be a half-bridge inverter circuit or a full-bridge inverter circuit. The inverter circuit may be used to convert a direct current to an alternating current. The communication and control circuit may be used to control the inverter circuit, and may also be used to complete the PD communication with the charger. In addition, the communication and control circuit may be used to perform FSK (Frequency Shift Keying) modulation on the wireless transmission signal, and may demodulate ASK (Amplitude Shift Keying) signal which is inputted by coupling of the Tx coil. The Tx coil may be used to generate a magnetic induction with a Rx coil of the wireless charging receiver, and send and receive wireless signals. The wireless charging receiver may include the Rx coil, a rectifier bridge, an LDO (Low Dropout Regulator), and a controller and communication circuit. Among them, the Rx coil may be used to generate a magnetic induction with the Tx coil, and send and receive the wireless signals. The rectifier bridge may be used to convert the alternating current to the direct current. The LDO may be used to output a stable voltage. An output terminal of the LDO is connected to a wireless input channel of the power management apparatus. The controller and communication circuit may be used to control the rectifier bridge, and may be used to perform ASK modulation on the wireless transmission signal and perform demodulation on the FSK signal which is inputted by coupling of the Rx coil, and may also be used to communicate with the power management apparatus. The power management apparatus may be used to receive a wireless input of the wireless charging receiver, charge the battery, and may also be used to perform I2C (Inter-Integrated Circuit) communication with the wireless charging receiver. The power management apparatus may be a power management chip, and may include a power management chip and a peripheral circuit, which are not limited herein. The method for wireless charging of the wireless charging system will be described in detail below, and details are not described herein again.

<FIG> is a flowchart of a method for wireless charging according to an aspect of the disclosure. The method is applied to a wireless charging transmitter. As shown in <FIG>, the method includes steps S21 to S24.

In step S21, in response to an establishment of a connection from the wireless charging transmitter to a charger, voltage and current capability information of the charger is acquired. For example, when detecting that a connection is established between the wireless charging transmitter and a charger, the wireless charging transmitter acquires voltage and current capability information of the charger in a handshake message.

The charger may be a PD charger. The wireless charging transmitter may be connected to the charger via a Type C cable.

In this embodiment, after the connection between the wireless charging transmitter and the charger is established, the charger may send voltage and current capability (Source Capability) information of the charger to the wireless charging transmitter, and the wireless charging transmitter may receive the voltage and current capability information of the charger from the charger. The voltage and current capability information may include fixed PDO (Power Data Object) information and APDO (Augmented Power Data Object) information. For example, the fixed PDO information may be 5V/3A, 9V/2A, 12V/<NUM>. 5A, or the like. The APDO information may represent programmable voltage and current information, such as <NUM>-<NUM>. 9V/3A and so on.

In a possible implementation manner, after acquiring the voltage and current capability information of the charger, the wireless charging transmitter may record the voltage and current capability information of the charger.

In this embodiment, the wireless charging transmitter may determine the voltage and current capability of the charger according to the voltage and current capability information of the charger. For example, the wireless charging transmitter may determine whether the charger meets a requirement of fast wireless charging according to the voltage and current capability information of the charger and a voltage and current requirement corresponding to the requirement of fast wireless charging. If the charger meets the requirement of fast wireless charging, it indicates that the charger supports fast wireless charging; and if the charger does not meet the requirement of fast wireless charging, it indicates that the charger does not support the fast wireless charging.

In a possible implementation manner, the wireless charging transmitter may send, to the charger, reception acknowledgment information corresponding to the voltage and current capability information in response to the received voltage and current capability information. The reception acknowledgment information may be used to indicate that the wireless charging transmitter has successfully received the voltage and current capability information of the charger. For example, the reception acknowledgment information may be GoodCRC information.

In a possible implementation manner, the method further includes: requesting, by the wireless charging transmitter, a first voltage to the charger after the voltage and current capability information of the charger is acquired. For example, the first voltage may be 5V.

In step S22, in response to fast wireless charge identification information received from a wireless charging receiver, acknowledgment information corresponding to the fast wireless charge identification information is determined according to the voltage and current capability information of the charger. For example, when receiving fast wireless charge identification information from a wireless charging receiver, the wireless charging transmitter determines acknowledgment information corresponding to the fast wireless charge identification information according to the voltage and current capability information of the charger.

In a possible implementation manner, the wireless charging transmitter may receive fast wireless charge identification information from the Rx coil of the wireless charging receiver through the Tx coil. The fast wireless charge identification information received by the Tx coil is ASK-modulated fast wireless charge identification information. The wireless charging transmitter may demodulate the ASK-modulated fast wireless charge identification information through the communication and control circuit module.

The acknowledgment information may be fast wireless charge acknowledgment (Fast-charge-identification-ACK) information or normal wireless charge acknowledgment (Normal-charge-identification-ACK) information.

In a possible implementation manner, when the fast wireless charge identification information is received from the wireless charging receiver, the determination of the acknowledgment information corresponding to the fast wireless charge identification information according to the voltage and current capability information of the charger includes: demodulating, in response to fast wireless charge identification information received from the wireless charging receiver, the fast wireless charge identification information; if the fast wireless charge identification information is correctly demodulated and it is determined according to the voltage and current capability information of the charger that the charger satisfies a requirement of fast wireless charging, determining the acknowledgment information corresponding to the fast wireless charge identification information as fast wireless charge acknowledgment information; and if the fast wireless charge identification information is correctly demodulated and it is determined according to the voltage and current capability information of the charger that the charger does not satisfy the requirement of fast wireless charging, determining the acknowledgment information corresponding to the fast wireless charge identification information as normal wireless charge acknowledgment information.

In a possible implementation manner, when the acknowledgment information is the fast wireless charge acknowledgment information, the acknowledgment information may include the voltage and current capability information of the charger.

In step S23, the acknowledgment information is sent to the wireless charging receiver.

In step S24, in response to a charging request received from the wireless charging receiver in response to the acknowledgment information, the charger is requested for a voltage and a current corresponding to the charging request. That is, in step S24, in response to a charging request including desired voltage information and desired current information received from the wireless charging receiver, the charger is requested for a voltage and a current corresponding to the desired voltage information and the desired current information, respectively. For example, when receiving a charging request from the wireless charging receiver in response to the acknowledgment information, the wireless charging transmitter sends a request to the charger to request the charger to output a voltage and a current corresponding to the charging request.

The charging request may be a fast wireless charging request or a normal wireless charging request. When the charging request is the normal wireless charging request, the wireless charging system may operate in the normal wireless charging mode, and the charging voltage of the normal wireless charging mode may be 5V.

For example, if the charging request is a fast wireless charging request and the voltage and the current corresponding to the charging request are 9V/2A, the wireless charging transmitter requests the voltage and current of 9V/2A from the charger to instruct the charger to output the voltage and current of 9V/2A. The charger responds to the charging request of the wireless charging transmitter and outputs the voltage and current of 9V/2A. After the input voltage of the wireless charging transmitter is adjusted, the voltage rectified and outputted by the wireless charging receiver increases accordingly.

In a possible implementation manner, if the wireless charging transmitter cannot correctly demodulate the fast wireless charge identification information, the wireless charging transmitter does not send the acknowledgment information to the wireless charging receiver.

In this embodiment, when detecting that a connection is established with the charger, the wireless charging transmitter acquires the voltage and current capability information of the charger; when the fast wireless charge identification information from the wireless charging receiver is received, the wireless charging transmitter determines the acknowledgment information corresponding to the fast wireless charge identification information according to the voltage and current capability information of the charger, sends the acknowledgment information to the wireless charging receiver, and when the charging request sent by the wireless charging receiver in response to the acknowledgment information is received, the wireless charging transmitter requests a voltage and a current corresponding to the charging request from the charger. In this way, the wireless charging process is optimized, and the flexibility of wireless charging is improved. In this embodiment, the wireless charging transmitter may perform a PD communication with the PD charger, and the wireless charging transmitter may further communicate with the PD charger according to the charging request of the power management apparatus, thereby enabling the PD communication between the mobile terminal and the wireless charging transmitter so as to perform an operation of increasing voltage and current, and thereby increasing the charging power.

<FIG> is a flowchart illustrating a method for wireless charging according to another aspect of the disclosure. The method is applied to a wireless charging receiver. As shown in <FIG>, the method includes steps S31 to S33.

In step S31, in response to fast wireless charge identification information received from a power management apparatus, the fast wireless charge identification information is forwarded to a wireless charging transmitter.

In a possible implementation manner, when the wireless charging receiver receives the fast wireless charge identification information from the power management apparatus, the fast wireless charge identification information may be ASK-modulated by the controller and communication circuit module, and the modulated fast wireless charge identification information is transmitted to the Tx coil of the wireless charging transmitter via the Rx coil.

In step S32, in response to acknowledgment information received from the wireless charging transmitter in response to the fast wireless charge identification information, the acknowledgment information is forwarded to the power management apparatus.

In a possible implementation manner, if the wireless charging receiver receives the acknowledgment information sent by the wireless charging transmitter in response to the fast wireless charge identification information within a first time period after forwarding the fast wireless charge identification information to the wireless charging transmitter, the acknowledgment information may be fed back to the power management apparatus via I2C. If the wireless charging receiver does not receive the acknowledgment information sent by the wireless charging transmitter in response to the fast wireless charge identification information within the first time period after forwarding the fast wireless charge identification information to the wireless charging transmitter, it may be determined that the wireless charging transmitter does not support the fast wireless charging.

In step S33, in response to a charging request received from the power management apparatus in response to the acknowledgment information, the charging request is forwarded to the wireless charging transmitter.

In a possible implementation manner, when the acknowledgment information is fast wireless charge acknowledgment information, the charging request is a fast wireless charging request; and when the acknowledgment information is normal wireless charge acknowledgment information, the charging request is a normal wireless charging request.

In a possible implementation manner, the method further includes: outputting, in response to detecting an establishment of a connection from the wireless charging receiver to the wireless charging transmitter, a first voltage to the power management apparatus. For example, when the Rx terminal is placed on the Tx terminal, through the magnetic induction between the Rx coil and the Tx coil, it may be determined that the connection between the wireless charging receiver and the wireless charging transmitter is established. The wireless charging receiver may rectify and then output the first voltage to the wireless input channel of the power management apparatus. The first voltage may be 5V.

In this embodiment, when receiving the fast wireless charge identification information from the power management apparatus, the wireless charging receiver forwards the fast wireless charge identification information to the wireless charging transmitter; when receiving acknowledgment information sent by the wireless charging transmitter in response to the fast wireless charge identification information, the wireless charging receiver forwards the acknowledgment information to the power management apparatus; and when a charging request sent by the power management apparatus in response to the acknowledgment information is received, the wireless charging receiver forwards the charging request to the wireless charging transmitter. In this way, the wireless charging process is optimized, the flexibility of wireless charging is improved, and a PD communication between the mobile terminal and the wireless charging transmitter is enabled so as to perform the operation of boosting voltage and current, thereby increasing the charging power.

<FIG> is a flowchart of a method for wireless charging according to another aspect of the disclosure. The method is applied to a power management apparatus, and the power management apparatus may be placed in a mobile terminal. As shown in <FIG>, the method includes steps S41 to S44.

In step S41, in response to detecting a first voltage input, fast wireless charge identification information is sent to the wireless charging receiver.

In this embodiment, when detecting that the first voltage exists in a wireless input channel, the power management apparatus may send fast wireless charge identification (fast-charge-identification) information to the wireless charging receiver to start the fast wireless charge identification process. The first voltage may be 5V.

In a possible implementation manner, the power management apparatus may communicate with the wireless charging receiver through the I2C and send the fast wireless charge identification information to the wireless charging receiver.

As an example of this implementation manner, the power management apparatus may communicate with the controller and communication circuit module of the wireless charging receiver via the I2C, and send the fast wireless charge identification information to the controller and communication circuit module of the wireless charging receiver.

In step S42, a charging request is determined based on acknowledgment information received from the wireless charging receiver, wherein the acknowledgment information is generated by the wireless charging receiver in response to the fast wireless charge identification information.

In a possible implementation manner, the determining the charging request according to the acknowledgment information includes: if the acknowledgment information is fast wireless charge acknowledgment information, determining the charging request as a fast wireless charging request; and if the acknowledgment information is normal wireless charge acknowledgment information, determining the charging request as a normal wireless charging request. In this implementation manner, if the acknowledgment information received by the power management apparatus is the fast wireless charge acknowledgment information, the fast wireless charging (fast-charge-on) request may be determined according to the voltage and current capability information of the charger carried in the acknowledgment information. The fast wireless charging request includes voltage and current information required for charging. For example, the voltage and current information required for charging is 9V/2A. If the acknowledgment information received by the power management apparatus is the normal wireless charge acknowledgment information, it may be determined that the charging request is a normal wireless charging (normal-charge-on) request.

In step S43, the charging request is sent to the wireless charging receiver.

In step S44, an input current of the power management apparatus is set according to the charging request and a charging efficiency.

For example, the voltage and current corresponding to the charging request are 9V/2A. The power management apparatus may set the current of the wireless input of the power management apparatus to be <NUM>. 5A according to the current corresponding to the charging request and the charging efficiency.

In a possible implementation manner, when receiving the acknowledgment information sent by the wireless charging receiver in response to the fast wireless charge identification information, the determining the charging request based on acknowledgment information received from the wireless charging receiver includes: determining the charging request based on the acknowledgment information received from the wireless charging receiver if the acknowledgment information is received within a first time period after sending the fast wireless charging identification information.

According to the present invention, after sending the fast wireless charge identification information to the wireless charging receiver, the method further includes: determining the charging request as a normal wireless charging request if the acknowledgment information is not received within a first time period after sending the fast wireless charging identification information.

In this embodiment, when the first voltage input is detected by the power management apparatus, the power management apparatus sends the fast wireless charge identification information to the wireless charging receiver; when receiving the acknowledgment information sent by the wireless charging receiver in response to the fast wireless charge identification information, the power management apparatus determines a charging request according to the acknowledgment information, sends the charging request to the wireless charging receiver, and sets the input current of the power management apparatus according to the charging request and the charging efficiency, thereby optimizing the wireless charging process and improving the flexibility of wireless charging, and enabling PD communication between the mobile terminal and the wireless charging transmitter so as to perform the operation of boosting voltage and current, thereby increasing the charging power.

<FIG> is a block diagram of a wireless charging transmitter according to an aspect of the disclosure. As shown in <FIG>, the wireless charging transmitter includes: an acquiring module <NUM>, a first determining module <NUM>, a first sending module <NUM>, and a first requesting module <NUM>.

The acquiring module <NUM> is configured to, in response to an establishment of a connection from the wireless charging transmitter to a charger, acquire voltage and current capability information of the charger.

The first determination module <NUM> is configured to, in response to fast wireless charge identification information received from a wireless charging receiver, determine acknowledgment information corresponding to the fast wireless charge identification information according to the voltage and current capability information of the charger.

The first sending module <NUM> is configured to send the acknowledgment information to the wireless charging receiver.

The first requesting module <NUM> is configured to, in response to a charging request received from the wireless charging receiver in response to the acknowledgment information, request the charger for a voltage and a current corresponding to the charging request. For example, the first requesting module <NUM> may request the charger to operate in a charging mode according to the voltage and a current corresponding to the charging request. The charging request may include the normal wireless charging request and a fast wireless charging request, where the two requests may require the charger to output different voltages and currents. Here, the first requesting module <NUM> may request the charger to enable the fast charging mode when the charging request received from the wireless charging receiver indicates that the fast charging mode is supported. When the charging request indicates that the fast charging mode is not supported, the first requesting module <NUM> may request the charger to maintain the normal charging mode. Additionally or alternatively, the first requesting module <NUM> may determine that the fast charging mode is not supported when no ACK signal is received during a preset time period.

<FIG> is a block diagram of a wireless charging transmitter according to one example of an aspect of the disclosure.

As shown in <FIG>, in a possible implementation manner, the first determining module <NUM> includes a demodulation submodule <NUM>, a first determining submodule <NUM>, and a second determining submodule <NUM>.

The demodulation submodule <NUM> is configured to, in response to fast wireless charge identification information received from the wireless charging receiver, demodulate the fast wireless charge identification information.

The first determining submodule <NUM> is configured to, if the fast wireless charge identification information is correctly demodulated the charger satisfies a requirement of fast wireless charging according to the voltage and current capability information of the charger, determine the acknowledgment information corresponding to the fast wireless charge identification information as fast wireless charge acknowledgment information.

The second determining submodule <NUM> is configured to, if the fast wireless charge identification information is correctly demodulated and the charger does not satisfy the requirement of fast wireless charging according to the voltage and current capability information of the charger, determine the acknowledgment information corresponding to the fast wireless charge identification information as normal wireless charge acknowledgment information.

In a possible implementation manner, the wireless charging transmitter further includes a second requesting module <NUM>.

The second requesting module <NUM> is configured to request the charger for a first voltage.

With respect to the wireless charging transmitter in the foregoing embodiment, a specific manner in which each module performs operations has been described in detail in the embodiments related to the methods, which will not be elaborated herein.

In this embodiment, when the wireless charging transmitter detects that a connection is established with the charger, the voltage and current capability information of the charger is acquired; when receiving the fast wireless charge identification information from the wireless charging receiver, the wireless charging transmitter determines, according to the voltage and current capability information of the charger, acknowledgment information corresponding to the fast wireless charge identification information, and sends the acknowledgment information to the wireless charging receiver; and when receiving the charging request sent by the wireless charging receiver in response to the acknowledgment information, the wireless charging transmitter requests a voltage and a current corresponding to the charging request from the charger, thereby optimizing the wireless charging process, increasing the flexibility of wireless charging. In this embodiment, the wireless charging transmitter may perform PD communication with the PD charger, and the wireless charging transmitter may further communicate with the PD charger according to the charging request of the power management apparatus, thereby enabling the mobile terminal to perform PD communication with the wireless charging transmitter so as to carry out the boost up of the voltage and current, thereby increasing the charging power.

<FIG> is a block diagram of a wireless charging receiver according to an aspect of the disclosure. As shown in <FIG>, the wireless charging receiver includes a first forwarding module <NUM>, a second forwarding module <NUM>, and a third forwarding module <NUM>.

The first forwarding module <NUM> is configured to, in response to fast wireless charge identification information received from a power management apparatus, forward the fast wireless charge identification information to a wireless charging transmitter.

The second forwarding module <NUM> is configured to, in response to acknowledgment information received from the wireless charging transmitter in response to the fast wireless charge identification information, forward the acknowledgment information to the power management apparatus.

The third forwarding module <NUM> is configured to, in response to a charging request received from the power management apparatus in response to the acknowledgment information, forward the charging request to the wireless charging transmitter.

In a possible implementation, when the acknowledgment information is fast wireless charge acknowledgment information, the charging request is a fast wireless charging request; and when the acknowledgment information is normal wireless charge acknowledgment information, the charging request is a normal wireless charging request.

<FIG> is a block diagram of a wireless charging receiver according to one example of an aspect of the disclosure. As shown in <FIG>, the wireless charging receiver further includes an output module <NUM>.

The output module <NUM> is configured to, in response to an establishment of a connection from the wireless charging receiver to the wireless charging transmitter, output a first voltage to the power management apparatus.

With regard to the wireless charging receiver in the foregoing embodiment, a specific manner in which each module performs operations has been described in detail in the embodiments related to the methods, and a detailed description is not elaborated herein.

In this embodiment, when the wireless charging receiver receives the fast wireless charge identification information from the power management apparatus, it forwards the fast wireless charge identification information to the wireless charging transmitter; when receiving the acknowledgment information sent by the wireless charging transmitter in response to the fast wireless charge identification information, the wireless charging receiver forwards the acknowledgment information to the power management apparatus; and when receiving a charging request sent by the power management apparatus in response to the acknowledgment information, the wireless charging receiver forwards the charging request to the wireless charging transmitter, thereby optimizing the wireless charging process, improving the flexibility of wireless charging, enabling PD communication between the mobile terminal and the wireless charging transmitter so as to perform the operation of boosting the voltage and the current, thereby increasing the charging power.

<FIG> is a block diagram of a power management apparatus according to an aspect of the disclosure. As shown in <FIG>, the power management apparatus includes: a second sending module <NUM>, a second determining module <NUM>, a third sending module <NUM> and a setting module <NUM>.

The second sending module <NUM> is configured to, in response to detecting a first voltage input, send fast wireless charge identification information to a wireless charging receiver.

The second determination module <NUM> is configured to determine a charging request based on acknowledgment information received from the wireless charging receiver, wherein the acknowledgment information is generated by the wireless charging receiver in response to the fast wireless charge identification information.

The third sending module <NUM> is configured to send a charging request to the wireless charging receiver.

The setting module <NUM> is configured to set an input current of the power management apparatus according to the charging request and a charging efficiency.

In a possible implementation manner, the second determining module <NUM> is configured to, when the acknowledgment information sent by the wireless charging receiver in response to the fast wireless charge identification information is received within a first time period after sending the fast wireless charge identification information, determine the charging request according to the acknowledgment information.

<FIG> is a block diagram of a power management apparatus according to an example of an aspect of the disclosure.

As shown in <FIG>, , the second determining module <NUM> includes: a third determining submodule <NUM> and a fourth determining submodule <NUM>.

The third determining submodule <NUM> is configured to, if the acknowledgment information is fast wireless charge acknowledgment information, determine the charging request as a fast wireless charging request.

The fourth determining submodule <NUM> is configured to, if the acknowledgment information is normal wireless charge acknowledgment information, determine the charging request as a normal wireless charging request.

According to the present invention, the power management apparatus further includes a third determining module <NUM>.

The third determining module <NUM> is configured to determine the charging request as a normal wireless charging request if the acknowledgment information is not received within a first time period after sending the fast wireless charge identification information.

With respect to the power management apparatus in the foregoing embodiment, a specific manner in which each module performs operations has been described in detail in the embodiments related to the methods, which will not be elaborated herein. Each module or submodule in the disclosure may be implemented at least partially by integrated circuits and other hardware components.

In this embodiment, when the first voltage input is detected by the power management apparatus, the power management apparatus sends the fast wireless charge identification information to the wireless charging receiver; when receiving the acknowledgment information sent by the wireless charging receiver in response to the fast wireless charge identification information, the power management apparatus determines a charging request according to the acknowledgment information, sends the charging request to the wireless charging receiver, and sets the input current of the power management apparatus according to the charging request and the charging efficiency. In this way, the wireless charging process is optimized and the flexibility of wireless charging is improved. Meanwhile, the PD communication between the mobile terminal and the wireless charging transmitter is enabled so as to perform the operation of increasing voltage and current, thereby increasing the charging power.

Claim 1:
A method for wireless charging, the method being applied to a power management apparatus, characterized in that the method comprises:
sending (S41), in response to detecting a first voltage in a normal wireless charging mode output by a wireless charging receiver, fast wireless charge identification information to the wireless charging receiver;
determining (S42) a charging request based on acknowledgment information received from the wireless charging receiver, wherein the acknowledgment information is generated by a wireless charging transmitter in response to the fast wireless charge identification information according to the voltage and current capability information of the charger;
sending (S43) the charging request to the wireless charging receiver; and
setting (S44) an input current of the power management apparatus according to the charging request and a charging efficiency,
wherein the determining (S42) a charging request based on acknowledgment information received from the wireless charging receiver comprises:
determining the charging request based on the acknowledgment information received from the wireless charging receiver if the acknowledgment information is received within a first time period after sending the fast wireless charge identification information, and
wherein the determining the charging request based on the acknowledgment information comprises:
determining, when the acknowledgment information is fast wireless charge acknowledgment information, the charging request as a fast wireless charging request; and
determining, when the acknowledgment information is normal wireless charge acknowledgment information, the charging request as a normal wireless charging request,
further comprising:
determining the charging request as a normal wireless charging request when the acknowledgment information is not received within a first time period after sending the fast wireless charge identification information.