HK40011936B - Wireless charging apparatus and method, and device to be charged - Google Patents

Description

Wireless charging device, method and device to be charged

Technical Field

This application relates to the field of wireless charging, and more specifically, to a wireless charging device, method, and device to be charged.

Background Technology

Currently, in the field of charging technology, devices to be charged mainly use wired charging methods.

Taking mobile phones as an example, currently, wired charging is still the primary method for charging mobile phones. Specifically, when it is necessary to charge a mobile phone, the phone can be connected to a power supply device through a charging cable (such as a Universal Serial Bus (USB) cable), and the output power of the power supply device is transmitted to the mobile phone through the charging cable to charge the battery in the mobile phone.

Wired charging for devices requires cables, making the preparation process cumbersome. Therefore, wireless charging is gaining popularity. However, traditional wireless charging methods are less effective and urgently need improvement.

Summary of the Invention

This application provides a wireless charging device, method, and device to be charged to improve the wireless charging process.

On one hand, a wireless charging device is provided, including: a communication control circuit, used to wirelessly communicate with the device to be charged during the wireless charging process, and to obtain the voltage and/or current of the battery entering the device to be charged, so as to adjust the transmission power of the wireless transmitting circuit;

The communication control circuit includes one or more of the following modules for wireless communication with the device to be charged: a Bluetooth module, a Wi-Fi module, a high-carrier-frequency-based short-range wireless communication module, an optical communication module, an ultrasonic communication module, an ultra-wideband communication module, and a mobile communication module.

On the other hand, a device to be charged is provided, the device to be charged comprising: a battery; a detection circuit for detecting the voltage and/or current entering the battery during wireless charging; and a communication control circuit for wirelessly communicating with the wireless charging device based on the voltage and/or current detected by the detection circuit, so that the wireless charging device adjusts the transmission power to adjust the voltage and/or current entering the battery.

The communication control circuit includes one or more of the following modules for wireless communication with the wireless charging device: a Bluetooth module, a Wi-Fi module, a high-carrier-frequency-based short-range wireless communication module, an optical communication module, an ultrasonic communication module, an ultra-wideband communication module, and a mobile communication module.

On the other hand, a wireless charging method is provided, the wireless charging method being applied to a wireless charging device, the method comprising:

During the wireless charging process of the device to be charged, wireless communication is conducted with the device to be charged to obtain the current and/or voltage of the battery entering the device to be charged, so as to adjust the transmission power of the wireless transmitting circuit.

The wireless communication method includes any one or more of the following: Bluetooth communication, Wi-Fi communication, short-range wireless communication based on high carrier frequency, optical communication, ultrasonic communication, ultra-wideband communication, and mobile communication.

On the other hand, a wireless charging method is provided, applied to a device to be charged, the method comprising:

During wireless charging, the voltage and/or current entering the battery are detected;

Based on the detected voltage and/or current, wireless communication is established with the wireless charging device so that the wireless charging device adjusts the transmission power to adjust the voltage and/or current entering the battery.

The wireless communication method includes any one or more of the following: Bluetooth communication, Wi-Fi communication, short-range wireless communication based on high carrier frequency, optical communication, ultrasonic communication, ultra-wideband communication, and mobile communication.

Attached Figure Description

Figure 1 is a structural example of a traditional wireless charging system.

Figure 2 is a schematic diagram of the structure of a wireless charging system provided in an embodiment of this application.

Figure 3 is a schematic diagram of the structure of a wireless charging system provided in another embodiment of this application.

Figure 4 is a schematic diagram of the structure of a wireless charging system provided in another embodiment of this application.

Figure 5 is a schematic diagram of the structure of a wireless charging system provided in another embodiment of this application.

Figure 6 is a schematic diagram of the structure of a device to be charged according to an embodiment of this application.

Figure 7 is a schematic diagram of the structure of a device to be charged according to another embodiment of this application.

Figure 8 is a schematic diagram of the structure of a wireless charging system provided in another embodiment of this application.

Figure 9 is a schematic flowchart of a wireless charging method provided in one embodiment of this application.

Figure 10 is a schematic flowchart of a wireless charging method provided in another embodiment of this application.

Figure 11 is a schematic flowchart of a wireless charging method provided in another embodiment of this application.

Detailed Implementation

The embodiments of this application are based on wireless charging technology to charge the device to be charged. Wireless charging technology can complete the power transmission without cables, which can simplify the operation of the charging preparation stage.

Traditional wireless charging technology typically connects a power supply device (such as an adapter) to a wireless charging device (such as a wireless charging dock), and then uses the wireless charging device to wirelessly transmit the output power of the power supply device to the device to be charged in a manner that is wireless (such as electromagnetic signals or electromagnetic waves), thereby wirelessly charging the device.

Based on different charging principles, wireless charging methods are mainly divided into three types: magnetic coupling (or electromagnetic induction), magnetic resonance, and radio waves. Currently, the mainstream wireless charging standards include the Qi standard, the Power Matters Alliance (PMA) standard, and the Alliance for Wireless Power (A4WP). Both the Qi and PMA standards use magnetic coupling for wireless charging. The A4WP standard uses magnetic resonance for wireless charging.

The following section, with reference to Figure 1, introduces the traditional wireless charging method.

As shown in Figure 1, the wireless charging system includes a power supply device 110, a wireless charging device 120, and a device to be charged 130, wherein the wireless charging device 120 may be, for example, a wireless charging base, and the device to be charged 130 may be, for example, a terminal.

After the power supply device 110 is connected to the wireless charging device 120, it transmits the output current of the power supply device 110 to the wireless charging device 120. The wireless charging device 120 can convert the output current of the power supply device 110 into electromagnetic signals (or electromagnetic waves) for transmission via its internal wireless transmitting circuit 121. For example, the wireless transmitting circuit 121 can convert the output current of the power supply device 110 into alternating current, and then convert the alternating current into electromagnetic signals via a transmitting coil or transmitting antenna (not shown in the figure).

The device to be charged 130 can receive the electromagnetic signal emitted by the wireless transmitting circuit 121 through the wireless receiving circuit 131 and convert the electromagnetic signal into the output current of the wireless receiving circuit 131. For example, the wireless receiving circuit 131 can convert the electromagnetic signal emitted by the wireless transmitting circuit 121 into alternating current through a receiving coil or receiving antenna (not shown in the figure), and perform rectification and/or filtering operations on the alternating current to convert the alternating current into the output voltage and output current of the wireless receiving circuit 131.

For traditional wireless charging technology, before wireless charging begins, the wireless charging device 120 and the device to be charged 130 negotiate the transmission power of the wireless transmitting circuit 121. Assuming the negotiated power between the wireless charging device 120 and the device to be charged 130 is 5W, the output voltage and output current of the wireless receiving circuit 131 are typically 5V and 1A, respectively. Assuming the negotiated power between the wireless charging device 120 and the device to be charged 130 is 10.8W, the output voltage and output current of the wireless receiving circuit 131 are typically 9V and 1.2A, respectively.

The output voltage of the wireless receiving circuit 131 is not suitable for direct application to the two ends of the battery 133. Instead, it needs to be transformed by the conversion circuit 132 in the device to be charged 130 to obtain the expected charging voltage and/or charging current of the battery 133 in the device to be charged 130.

The conversion circuit 132 can be used to convert the output voltage of the wireless receiving circuit 131 to meet the expected charging voltage and/or charging current requirements of the battery 133.

As an example, the conversion circuit 132 may refer to a charging management module, such as a charging integrated circuit (IC). During the charging process of battery 133, the conversion circuit 132 can be used to manage the charging voltage and/or charging current of battery 133. The conversion circuit 132 may include voltage feedback functionality and/or current feedback functionality to achieve management of the charging voltage and/or charging current of battery 133.

For example, the battery charging process may include one or more of a trickle charging stage, a constant current charging stage, and a constant voltage charging stage. In the trickle charging stage, the converter circuit 132 may utilize current feedback to ensure that the current entering the battery 133 during the trickle charging stage meets the expected charging current of the battery 133 (e.g., a first charging current). In the constant current charging stage, the converter circuit 132 may utilize current feedback to ensure that the current entering the battery 133 during the constant current charging stage meets the expected charging current of the battery 133 (e.g., a second charging current, which may be greater than the first charging current). In the constant voltage charging stage, the converter circuit 132 may utilize voltage feedback to ensure that the voltage applied across the battery 133 during the constant voltage charging stage meets the expected charging voltage of the battery 133.

As an example, when the output voltage of the wireless receiving circuit 131 is greater than the expected charging voltage of the battery 133, the conversion circuit 132 can be used to step down the output voltage of the wireless receiving circuit 131 so that the charging voltage obtained after step-down conversion meets the expected charging voltage requirement of the battery 133. As another example, when the output voltage of the wireless receiving circuit 131 is less than the expected charging voltage 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 charging voltage obtained after boost conversion meets the expected charging voltage requirement of the battery 133.

As another example, taking the output voltage of the wireless receiving circuit 131 as 5V constant voltage, when the battery 133 includes a single cell (taking a lithium battery cell as an example, the charging cut-off voltage of a single cell is generally 4.2V), the conversion circuit 132 (e.g., a Buck step-down circuit) can step down the output voltage of the wireless receiving circuit 131 so that the charging voltage obtained after step-down meets the expected charging voltage requirement of the battery 133.

As another example, taking the output voltage of the wireless receiving circuit 131 as 5V constant voltage, when the battery 133 includes two or more cells connected in series (taking lithium battery cells as an example, the charging cut-off voltage of a single cell is generally 4.2V), the conversion circuit 132 (e.g., a boost circuit) can boost the output voltage of the wireless receiving circuit 131 so that the boosted charging voltage meets the expected charging voltage requirements of the battery 133.

Due to its low conversion efficiency, the conversion circuit 132 causes unconverted electrical energy to be dissipated as heat. This heat accumulates inside the device 130 to be charged. The device 130 has limited design and heat dissipation space (for example, mobile terminals are becoming increasingly thinner and lighter, while densely packed with electronic components to improve performance). This not only increases the design difficulty of the conversion circuit 132 but also makes it difficult to remove the heat accumulated inside the device 130 in a timely manner, potentially causing malfunctions in the device 130.

For example, the heat accumulated on the conversion circuit 132 may cause thermal interference to electronic components near the conversion circuit 132, leading to malfunctions. Similarly, the heat accumulated on the conversion circuit 132 may shorten the lifespan of the conversion circuit 132 and nearby electronic components. Furthermore, the heat accumulated on the conversion circuit 132 may cause thermal interference to the battery 133, resulting in abnormal charging and discharging of the battery 133. Additionally, the heat accumulated on the conversion circuit 132 may cause the temperature of the device 130 to rise, affecting the user's charging experience. Moreover, the heat accumulated on the conversion circuit 132 may cause a short circuit within the conversion circuit 132 itself, causing the output voltage of the wireless receiving circuit 131 to be directly applied across the battery 133, resulting in abnormal charging. If the battery 133 is under overvoltage charging for an extended period, it may even explode, endangering user safety.

To address the aforementioned problems, this application provides a wireless charging system. In this system, the wireless charging device can wirelessly communicate with the device being charged, and its transmission power can be adjusted based on feedback from the device, ensuring that the output voltage and/or output current of the wireless receiving circuit within the device matches the current charging stage of the battery. In other words, the wireless charging device can wirelessly communicate with the device, and its transmission power can be adjusted based on feedback from the device, ensuring that the output voltage and/or output current of the wireless receiving circuit within the device meets the battery's current charging needs (including the battery's current requirements for charging voltage and/or charging current). This allows the output voltage and/or output current of the wireless receiving circuit in the device to be directly applied to the battery terminals for charging (hereinafter referred to as direct charging), thus avoiding energy loss and heat generation caused by the conversion circuit described above that alters the output voltage and/or output current of the wireless receiving circuit.

The wireless charging system 200 provided in the embodiments of this application will be described in detail below with reference to Figure 2.

As shown in Figure 2, the wireless charging system 200 provided in this application may include a wireless charging device 220 and a device to be charged 230.

The wireless charging device 220 may include a wireless transmitting circuit 221 and a first communication control circuit 222. The control functions in the first communication control circuit 222 may be implemented, for example, by a microcontroller unit (MCU).

The wireless transmitting circuit 221 can be used to transmit electromagnetic signals for wireless charging of the device 230 to be charged. In some embodiments, the wireless transmitting circuit 221 may include a wireless transmitting drive circuit and a transmitting coil or transmitting antenna (not shown). The wireless transmitting 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. In one embodiment, the wireless transmitting drive circuit includes an inverter circuit and a resonant circuit.

The first communication control circuit 222 can be used to wirelessly communicate with the device to be charged 230 during wireless charging to obtain the voltage and/or current of the battery entering the device to be charged 230, so as to adjust the transmission power of the wireless transmitting circuit. Thus, by adjusting the transmission power of the wireless transmitting circuit, the voltage and/or current entering the battery can be adjusted. In one embodiment, adjusting the voltage and/or current entering the battery may include matching the output voltage and/or output current of the wireless receiving circuit in the device to be charged with the current charging stage of the battery in the device to be charged.

Specifically, the first communication control circuit 222 can wirelessly communicate with the second communication control circuit 235 in the device to be charged 230. This application embodiment does not specifically limit the wireless communication method between the first communication control circuit 222 and the second communication control circuit 235, nor the communication information exchanged between the two circuits; these will be described in detail below with reference to specific embodiments.

The device to be charged 230 may include: a wireless receiving circuit 231, a battery 232, a first charging channel 233, a detection circuit 234, and a second communication control circuit 235. The control functions in the second communication control circuit 235 may be implemented, for example, by a microcontroller unit (MCU), or by the MCU and the application processor (AP) inside the device to be charged.

The detection circuit 234 is used to detect the voltage and/or current entering the battery 232 during wireless charging.

The second communication control circuit 235 is used to communicate wirelessly with the wireless charging device 220 based on the voltage and/or current detected by the detection circuit, so that the wireless charging device 220 adjusts the transmission power to adjust the voltage and/or current entering the battery 232.

In one embodiment, adjusting the voltage and/or current entering the battery 232 may include adjusting the transmission power of the wireless transmitting circuit of the wireless charging device 220 so that the output voltage and/or output current of the wireless receiving circuit of the device to be charged matches the current charging stage of the battery.

In one embodiment, the wireless receiving circuit 231 can be used to receive electromagnetic signals and convert the electromagnetic signals into the output voltage and output current of the wireless receiving circuit 231. Specifically, the wireless receiving circuit 231 may include a receiving coil or receiving antenna (not shown in the figure), and a shaping circuit such as a rectifier circuit and/or a filter circuit connected to the receiving coil and receiving antenna. The receiving antenna or receiving coil can be used to convert the electromagnetic signals into alternating current, and the shaping circuit can be used to convert the alternating current into the output voltage and output current of the wireless receiving circuit 231. It should be noted that the embodiments of this application do not specifically limit the specific form of the shaping circuit or the form of the output voltage and output current of the wireless receiving circuit 231 obtained after shaping by the shaping circuit. In some embodiments, the shaping circuit may include a rectifier circuit and a filter circuit, and the output voltage of the wireless receiving circuit 231 may be a stable voltage obtained after filtering. In other embodiments, the shaping circuit may include a rectifier circuit, and the output voltage of the wireless receiving circuit 231 may be a voltage of a pulsating waveform obtained after rectification, which is directly applied to the two ends of the battery 232 of the device to be charged 230 to charge the battery 232. It can be understood that the output current of the wireless receiving circuit 231 can charge the battery 232 intermittently. The period of the output current of the wireless receiving circuit 231 can vary with the frequency of the AC power input to the wireless charging system 200, such as the AC grid. For example, the frequency corresponding to the period of the output current of the wireless receiving circuit 231 is an integer multiple or reciprocal multiple of the grid frequency. Furthermore, when the output current of the wireless receiving circuit 231 charges the battery 232 intermittently, the current waveform corresponding to the output current of the wireless receiving circuit 231 can consist of one or a set of pulses synchronized with the grid. This periodic variation in voltage/current magnitude, compared to traditional constant DC power, can reduce lithium plating in lithium batteries, improve battery life, and help reduce battery polarization, increase charging speed, and reduce battery heat generation, thereby ensuring the safety and reliability of the charging device.

The first charging channel 233 can be used to receive the output voltage and output current of the wireless receiving circuit 231, and charge the battery 232 based on the output voltage and output current of the wireless receiving circuit 231. The first charging channel 233 provided in this embodiment can directly charge the battery 232 based on the output voltage and output current of the wireless receiving circuit 231. For example, the first charging channel 233 can be a wire. Furthermore, if the device to be charged 232 includes multiple charging channels, a switch or other device (see switch 238 in FIG. 6) can be provided on the first charging channel 233 for switching between different charging channels.

The detection circuit 234 can be used to detect the output voltage and/or output current of the wireless receiving circuit 231. In some embodiments, the detection circuit 234 may include a voltage detection circuit and a current detection circuit.

The voltage detection circuit can be used to sample the output voltage of the wireless receiving circuit 231 and transmit the sampled voltage value to the second communication control circuit 235. In some embodiments, the voltage detection circuit can sample the output voltage of the wireless receiving circuit 231 by series voltage division.

The current detection circuit can be used to sample the output current of the wireless receiving circuit 231 and transmit the sampled current value to the second communication control circuit 235. In some embodiments, the current detection circuit can sample the output current of the wireless receiving circuit 231 using a current-sensing resistor and a galvanometer.

The second communication control circuit 235 can be used to communicate wirelessly with the first communication control circuit 222 based on the output voltage and/or output current of the wireless receiving circuit 231 detected by the detection circuit 234, so that the first communication control circuit 222 adjusts the transmission power of the wireless transmitting circuit 221 so that the output voltage and/or output current of the wireless receiving circuit 231 matches the current charging stage of the battery 232.

In other words, the second communication control circuit 235 can be used to communicate wirelessly with the first communication control circuit 222 based on the output voltage and/or output current of the wireless receiving circuit 231 detected by the detection circuit 234, so that the first communication control circuit 222 adjusts the transmission power of the wireless transmitting circuit 221 so that the output voltage and/or output current of the wireless receiving circuit 231 meets the charging requirements of the battery 232 (including the battery 232's requirements for charging voltage and/or charging current).

In other words, the second communication control circuit 235 can be used to communicate wirelessly with the first communication control circuit 222 based on the output voltage and/or output current of the wireless receiving circuit 231 detected by the detection circuit 234, so that the first communication control circuit 222 can adjust the transmission power of the wireless transmitting circuit 221, so that the output voltage and/or output current of the wireless receiving circuit 231 meet the charging requirements of the battery 232 in at least one of the trickle charging stage, constant voltage charging stage, and constant current charging stage.

In other words, the second communication control circuit 235 can be used to communicate wirelessly with the first communication control circuit 222 based on the output voltage and/or output current of the wireless receiving circuit 231 detected by the detection circuit 234, so that the first communication control circuit 222 can perform constant voltage and/or constant current control on the charging process of the battery 232 by adjusting the transmission power of the wireless transmitting circuit 221.

The battery charging process may include at least one of a trickle charging stage, a constant current charging stage, and a constant voltage charging stage.

The second communication control circuit 235 communicates wirelessly with the first communication control circuit 222 based on the output voltage and/or output current of the wireless receiving circuit 231 detected by the detection circuit. This allows the first communication control circuit 222 to adjust the transmission power of the wireless transmitting circuit 221 based on the output voltage and/or output current of the wireless receiving circuit 231. This adjustment may include: during the trickle charging phase of the battery 232, the second communication control circuit 235 communicates wirelessly with the first communication control circuit 222 based on the output voltage and/or output current of the wireless receiving circuit 231 detected by the detection circuit 234. This allows the first communication control circuit 222 to adjust the transmission power of the wireless transmitting circuit 221 so that the output current of the wireless receiving circuit 231 matches the charging current corresponding to the trickle charging phase (or, so that the output current of the wireless receiving circuit 231 meets the charging current requirements of the battery 232 during the trickle charging phase).

Taking a trickle charging stage with a charging current of 1A as an example, when the battery 232 is in the trickle charging stage, the output current of the wireless receiving circuit 231 can be detected in real time by the detection circuit 234. When the output current of the wireless receiving circuit 231 is greater than 1A, the second communication control circuit 235 can communicate with the first communication control circuit 222 so that the first communication control circuit 222 can adjust the transmission power of the wireless transmitting circuit 221, so that the output current of the wireless receiving circuit 231 returns to 1A.

The second communication control circuit 235 communicates wirelessly with the first communication control circuit 222 based on the output voltage and/or output current of the wireless receiving circuit 231 detected by the detection circuit 234. This allows the first communication control circuit 222 to adjust the transmission power of the wireless transmitting circuit 221 based on the output voltage and/or output current of the wireless receiving circuit 231. This adjustment can include: during the constant-voltage charging phase of the battery 232, the second communication control circuit 235 communicates wirelessly with the first communication control circuit 222 based on the output voltage and/or output current of the wireless receiving circuit 231 detected by the detection circuit 234. This allows the first communication control circuit 222 to adjust the transmission power of the wireless transmitting circuit 221 so that the output voltage of the wireless receiving circuit 231 matches the charging voltage corresponding to the constant-voltage charging phase (or, so that the output voltage of the wireless receiving circuit 231 meets the charging voltage requirements of the battery 232 during the constant-voltage charging phase).

Taking a constant-voltage charging stage with a charging voltage of 5V as an example, when the battery 232 is in the constant-voltage charging stage, the output voltage of the wireless receiving circuit 231 can be detected in real time by the detection circuit. When the output voltage of the wireless receiving circuit 231 is lower than 5V, the second communication control circuit 235 can communicate with the first communication control circuit 222 so that the first communication control circuit 222 can adjust the transmission power of the wireless transmitting circuit 221, so that the output voltage of the wireless receiving circuit 231 returns to 5V. There may be various reasons for the change in the output voltage of the wireless receiving circuit 231, and this embodiment does not specifically limit this. For example, the transmission of electromagnetic signals between the wireless transmitting circuit 221 and the wireless receiving circuit 231 may be interfered with, resulting in a decrease in energy conversion efficiency, thereby causing the output voltage of the wireless receiving circuit 231 to be less than 5V.

The second communication control circuit 235 communicates wirelessly with the first communication control circuit 222 based on the output voltage and/or output current of the wireless receiving circuit 231 detected by the detection circuit. This allows the first communication control circuit 222 to adjust the transmission power of the wireless transmitting circuit 221 based on the output voltage and/or output current of the wireless receiving circuit 231. This adjustment may include: during the constant current charging phase of the battery 232, the second communication control circuit 235 communicates wirelessly with the first communication control circuit 222 based on the output voltage and/or output current of the wireless receiving circuit 231 detected by the detection circuit 234. This allows the first communication control circuit 222 to adjust the transmission power of the wireless transmitting circuit 221 so that the output current of the wireless receiving circuit 231 matches the charging current corresponding to the constant current charging phase (or, so that the output current of the wireless receiving circuit 231 meets the charging current requirements of the battery 232 during the constant current charging phase).

Taking a constant current charging stage with a charging current of 2A as an example, when the battery 232 is in the constant current charging stage, the output current of the wireless receiving circuit 231 can be detected in real time by the detection circuit. When the output current of the wireless receiving circuit 231 is lower than 2A, the second communication control circuit 235 can communicate with the first communication control circuit 222 so that the first communication control circuit 222 can adjust the transmission power of the wireless transmitting circuit 221, so that the output current of the wireless receiving circuit 231 returns to 2A. There may be various reasons for the change in the output current of the wireless receiving circuit 231, and this embodiment does not specifically limit this. For example, the transmission of electromagnetic signals between the wireless transmitting circuit 221 and the wireless receiving circuit 231 may be interfered with, resulting in a decrease in energy conversion efficiency, thereby causing the output current of the wireless receiving circuit 231 to be less than 2A.

It should be noted that the constant current charging stage or constant current phase mentioned in the embodiments of this application does not require the charging current to remain completely constant. For example, it can generally refer to the peak value or average value of the charging current remaining constant over a period of time. In practice, the constant current charging stage usually adopts a segmented constant current charging method.

Multi-stage constant current charging can have N constant current stages (N is an integer not less than 2). Multi-stage constant current charging begins with a predetermined charging current in the first stage. The N constant current stages are executed sequentially from the first stage to the (N-1)th stage. When transitioning from one constant current stage to the next, the peak or average current value of the pulsating waveform can decrease. When the battery voltage reaches the charging termination voltage threshold, the previous constant current stage transitions to the next. The current transition between two adjacent constant current stages can be gradual, or it can be a step-like jump.

The device to be charged used in the embodiments of this application may refer to a terminal. This "terminal" may include, but is not limited to, devices configured to receive/transmit communication signals via a wired connection (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 a wireless interface (e.g., for cellular networks, wireless local area networks (WLANs), digital television networks such as digital video broadcasting handheld (DVB-H) networks, satellite networks, amplitude modulation-frequency modulation (AM-FM) broadcast transmitters, and/or another communication terminal). A terminal configured to communicate via a wireless interface may be referred to as a "wireless communication terminal," a "wireless terminal," and/or a "mobile terminal." Examples of mobile terminals include, but are not limited to, satellite or cellular phones; personal communication system (PCS) terminals that can combine cellular radiotelephones with data processing, fax, and data communication capabilities; personal digital assistants (PDAs) that may include radiotelephones, pagers, Internet/intranet access, web browsers, notebooks, calendars, and/or Global Positioning System (GPS) receivers; and conventional laptop and/or handheld receivers or other electronic devices that include radiotelephone transceivers. Additionally, the charging device or terminal used in the embodiments of this application may also include a power bank capable of accepting charging from an adapter to store energy for use in other electronic devices.

This application embodiment does not specifically limit the communication method and communication sequence between the wireless charging device 220 and the device to be charged 230.

Optionally, in some embodiments, the wireless communication between the wireless charging device 220 and the device to be charged 230 (or the second communication control circuit 235 and the first communication control circuit 222) can be unidirectional wireless communication. For example, during the wireless charging process of the battery 232, the device to be charged 230 can be designated as the initiator of communication, and the wireless charging device 220 as the receiver. For instance, during the constant current charging phase of the battery, the device to be charged 230 can detect the charging current of the battery 232 (i.e., the output current of the wireless receiving circuit 231) in real time through the detection circuit 234. When the charging current of the battery 232 does not match the current charging phase of the battery, the device to be charged 230 sends adjustment information to the wireless charging device 220, instructing the wireless charging device 220 to adjust the transmission power of the wireless transmitting circuit 221.

Optionally, in some embodiments, the wireless communication between the wireless charging device 220 and the device to be charged 230 (or the second communication control circuit 235 and the first communication control circuit 222) can be bidirectional wireless communication. Bidirectional wireless communication generally requires the receiver to send a response message to the initiator after receiving the communication request initiated by the initiator. The bidirectional communication mechanism can make the communication process more secure.

The above description of the embodiments of this application does not limit the master-slave relationship between the wireless charging device 220 (the first communication control circuit 222 in the wireless charging device 220) and the device to be charged 230 (the first communication control circuit 235 in the device to be charged 230). In other words, either the wireless charging device 220 or the device to be charged 230 can initiate a two-way communication session as the master device, and the other party can respond or reply to the communication initiated by the master device as the slave device. As a feasible approach, the master and slave devices can be determined by comparing the link status between the wireless charging device 220 and the device to be charged 230 during the communication process. For example, assuming that the wireless link from the wireless charging device 220 to the device to be charged 230 is the uplink and the wireless link from the device to be charged 230 to the wireless charging device 220 is the downlink, if the uplink quality is better, the wireless charging device 220 can be set as the master device for communication; if the downlink quality is better, the device to be charged 230 can be set as the slave device for communication.

This application embodiment does not limit the specific implementation of the bidirectional communication between the wireless charging device 220 and the device to be charged 230. That is, either the wireless charging device 220 or the device to be charged 230 initiates a communication session as the master device, and the other device responds to the communication session initiated by the master device as the slave device. At the same time, the master device can respond to the slave device's first response or first reply with a second response. This means that a communication negotiation process between the master and slave devices has been completed.

One way for the master device to make a second response based on the slave device's first response or first reply to the communication session is that the master device can receive the slave device's first response or first reply to the communication session and make a targeted second response based on the received slave device's first response or first reply.

Another way for the master device to make a further second response based on the slave device's first response or first reply to the communication session is that if the master device does not receive the slave device's first response or first reply to the communication session within a preset time, the master device will also make a targeted second response to the slave device's first response or first reply.

Optionally, in some embodiments, when the device to be charged 230 initiates a communication session as the master device, and the wireless charging device 220 responds to the communication session initiated by the master device as the slave device, there is no need for the device to be charged 230 to make a targeted second response to the first response or first reply of the wireless charging device 220. It can be considered that a communication negotiation process has been completed between the wireless charging device 220 and the device to be charged 230.

This application embodiment does not specifically limit the wireless communication method between the first communication control circuit 222 in the wireless charging device 220 and the second communication control circuit 235 in the device to be charged 230. For example, the first and second communication control circuits can communicate wirelessly based on Bluetooth, wireless fidelity (Wi-Fi), short-range wireless communication based on high carrier frequency, optical communication, ultrasonic communication, ultra-wideband communication, mobile communication, or backscatter modulation (or power load modulation).

In one embodiment, the first communication control circuit may include any or more of the following modules for wireless communication with the second communication control circuit: a Bluetooth module, a Wi-Fi module, a high-carrier-frequency-based short-range wireless communication module, an optical communication module, an ultrasonic communication module, an ultra-wideband communication module, and a mobile communication module.

In one embodiment, the high-carrier-frequency-based short-range wireless communication module includes an IC chip with an internally packaged EHF antenna. Optionally, the high carrier frequency is 60 GHz.

In one embodiment, the optical communication module includes an infrared communication module that can transmit information using infrared light.

In one embodiment, the mobile communication module may use mobile communication protocols such as 5G, 4G, or 3G to transmit information.

Accordingly, the second communication control circuit 235 may include any or more of the following modules for wireless communication with the first communication control circuit 222: a Bluetooth module, a Wi-Fi module, a high-carrier-frequency-based short-range wireless communication module, an optical communication module, an ultrasonic communication module, an ultra-wideband communication module, and a mobile communication module.

Therefore, the wireless communication between the first communication control circuit 222 and the second communication control circuit 235 includes any one or more of the following: Bluetooth communication, Wi-Fi communication, short-range wireless communication based on high carrier frequency, optical communication, ultrasonic communication, ultra-wideband communication, and mobile communication.

In embodiments of this disclosure, the first communication control circuit 222 and the second communication control circuit 235 may also support one or more wireless communication methods. In various embodiments, wireless communication may include standard communication or non-standard communication. Some examples of standard wireless communication include: link protocols, including but not limited to: Bluetooth, IEEE 802.11 (Wireless LANs), 802.15 (WPANs), 802.16 (WiMAX), 802.20 mobile wireless broadband access; cellular protocols (mobile communication protocols), including but not limited to: 5G standard protocols, LTE, CDMA, and GSM; Zigbee and Ultra-Wideband (UWB) technologies. These protocols support radio frequency communication, and some also support infrared communication. Other forms of wireless communication may also be used, such as ultrasonic communication, optical communication, short-range wireless communication based on high carrier frequencies, and others. It should be understood that the standards that can be used for the above-described wireless communication include conventional and existing standards. Future versions and future standards employing these standards are also included without departing from the scope of this application.

In embodiments of this application, the first communication control circuit 222 and the second communication control circuit 235 can also determine the wireless communication method to be used based on the detected signal strength of various wireless communication methods. For example, when using Wi-Fi for wireless communication, if a weak Wi-Fi signal is detected, the method will switch to another wireless communication method.

The wireless communication method described in this application sends information such as the voltage, current, or power entering the battery to the wireless charging device, allowing the wireless charging device to adjust the transmission power of the wireless transmitting circuit in real time based on the received information. This wireless communication method improves communication reliability, thereby enhancing charging safety. Compared to related technologies (e.g., the Qi standard) that use signal modulation coupled to a coil in the wireless receiving circuit for communication, this method improves communication reliability and avoids voltage ripple caused by signal coupling, which could affect the voltage processing of the converter or step-down circuit of the device being charged.

As mentioned above, during wireless charging, the second communication control circuit 235 can wirelessly communicate with the first communication control circuit 222 based on the output voltage and/or output current detected by the detection circuit 234 on the first charging channel, so that the first communication control circuit 222 can adjust the transmission power of the wireless transmitting circuit 221. However, this embodiment does not specifically limit the communication content between the second communication control circuit 235 and the first communication control circuit 222. As an example, the second communication control circuit 235 can send the output voltage and/or output current of the wireless receiving circuit 231 detected by the detection circuit 234 to the first communication control circuit 222. Further, the second communication control circuit 235 can also send battery status information to the first communication control circuit 222, wherein the battery status information includes the current charge and/or current voltage of the battery 232 in the device to be charged 230. The first communication control circuit 222 can first determine the current charging stage of the battery 232 based on the battery 232 status information, and then determine the target charging voltage and/or target charging current that match the current charging stage of the battery 232. Then, the first communication control circuit 222 can compare the output voltage and/or output current of the wireless receiving circuit 231 sent by the second communication control circuit 235 with the above-mentioned target charging voltage and/or target charging current to determine whether the output voltage and/or output current of the wireless receiving circuit 231 matches the current charging stage of the battery 232. If the output voltage and/or output current of the wireless receiving circuit 231 does not match the current charging stage of the battery 232, the transmission power of the wireless transmitting circuit 221 is adjusted until the output voltage and/or output current of the wireless receiving circuit 231 matches the current charging stage of the battery 232.

As another example, the second communication control circuit 235 can send adjustment information to the first communication control circuit 222 to instruct the first communication control circuit 222 to adjust the transmission power of the wireless transmitting circuit 221. For example, the second communication control circuit 235 can instruct the first communication control circuit 222 to increase the transmission power of the wireless transmitting circuit 221; or, alternatively, the second communication control circuit 235 can instruct the first communication control circuit 222 to decrease the transmission power of the wireless transmitting circuit 221. More specifically, the wireless charging device 220 can set multiple transmission power levels for the wireless transmitting circuit 221. Each time the first communication control unit 222 receives adjustment information, it adjusts the transmission power level of the wireless transmitting circuit 221 by one level until the output voltage and/or output current of the wireless receiving circuit 231 matches the current charging stage of the battery 232.

In addition to the communication content described above, the first communication control circuit 222 and the second communication control circuit 235 can also exchange many other communication information wirelessly. In some embodiments, 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 battery 232 temperature information, indication information for entering overvoltage protection or overcurrent protection, and power transmission efficiency information (which can be used to indicate the power transmission efficiency between the wireless transmitting circuit 221 and the wireless receiving circuit 231).

For example, when the temperature of battery 232 is too high, the first communication control circuit 222 and/or the second communication control circuit 235 can control the charging circuit to enter a protection state, such as controlling the charging circuit to stop wireless charging. As another example, after receiving overvoltage protection or overcurrent protection indication information sent by the second communication control circuit 235, the first communication control circuit 222 can reduce the transmission power or control the wireless transmission circuit 221 to stop working. Furthermore, after receiving power transmission efficiency information sent by the second communication control circuit 235, if the power transmission efficiency is lower than a preset threshold, the first communication control circuit 222 can control the wireless transmission circuit 221 to stop working and notify the user of this event, such as displaying the low power transmission efficiency on a screen or indicating the low power transmission efficiency via an indicator light, so that the user can adjust the wireless charging environment.

In some embodiments, the first communication control circuit 222 and the second communication control circuit 235 may interact with other information that can be used to adjust the transmission power of the wireless transmitting circuit 221, such as temperature information of the battery 232, information indicating the peak or average value of the output voltage and/or output current of the wireless receiving circuit 231, power transmission efficiency information (which can be used to indicate the power transmission efficiency between the wireless transmitting circuit 221 and the wireless receiving circuit 231), etc.

For example, the second communication control circuit 235 can send power transmission efficiency information to the first communication control circuit 222, which is further used to determine the adjustment range of the transmission power of the wireless transmitting circuit 221 based on the power transmission efficiency information. Specifically, if the power transmission efficiency information indicates that the power transmission efficiency between the wireless transmitting circuit 221 and the wireless receiving circuit 231 is low, the first communication control circuit 222 can increase the adjustment range of the transmission power of the wireless transmitting circuit 221, so that the transmission power of the wireless transmitting circuit 221 quickly reaches the target power.

For example, if the wireless receiving circuit 231 outputs a pulsating waveform voltage and/or current, the second communication control circuit 235 can send information to the first communication control circuit 222 indicating the peak or average value of the output voltage and/or output current of the wireless receiving circuit 231. The first communication control circuit 222 can determine whether the peak or average value of the output voltage and/or output current of the wireless receiving circuit 231 matches the current charging stage of the battery. If they do not match, the transmission power of the wireless transmitting circuit 221 can be adjusted.

For example, the second communication control circuit 235 can send the temperature information of the battery 232 to the first communication control circuit 222. If the temperature of the battery 232 is too high, the first communication control circuit 222 can reduce the transmission power of the wireless transmitting circuit 221 to reduce the output current of the wireless receiving circuit 231, thereby reducing the temperature of the battery 232.

As shown in Figure 3, the wireless charging device 220 provided in this embodiment may further include a charging interface 223. The wireless transmitting circuit 221 may also be used to receive the output voltage and output current of the power supply device 210 through the charging interface 223, and generate electromagnetic signals according to the output voltage and output current of the power supply device 210.

This application does not specifically limit the type of power supply device 210. For example, the power supply device 210 can be an adapter, a power bank, or a computer.

This application does not specifically limit the type of charging interface 223. Optionally, in some embodiments, the charging interface 223 can be a USB interface. The USB interface can be, for example, a USB 2.0 interface, a micro USB interface, or a USB Type-C interface. Optionally, in other embodiments, the charging interface 223 can also be a Lightning interface, or any other type of parallel port and/or serial port that can be used for charging.

This application does not specifically limit the communication method between the first communication control circuit 222 and the power supply device 210. As an example, the first communication control circuit 222 can 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 this communication interface. As another example, the first communication control circuit 222 can communicate with the power supply device 210 wirelessly. For example, the first communication control circuit 222 can perform near field communication (NFC) with the power supply device 210. As yet another example, the first communication control circuit 222 can communicate with the power supply device 210 through the charging interface 223 without needing to set up an additional communication interface or other wireless communication module, thus simplifying the implementation of the wireless charging device 220. For example, 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. For example, the charging interface 223 can be a USB interface (such as a USB TYPE-C interface) that supports the power delivery (PD) communication protocol, and the first communication control circuit 222 and the power supply device 210 can communicate based on the PD communication protocol.

It should be understood that the power supply device 210 can be a regular power supply device with a fixed output power, or it can be a power supply device with adjustable output power as provided in the embodiments of this application. The power supply device with adjustable output power can internally be equipped with a voltage feedback loop and a current feedback loop, thereby enabling the adjustment of its output voltage and/or output current according to actual needs (the following description mainly uses the power supply device 210 as an example of a power supply device with adjustable output power). Furthermore, the power supply device 210 can also have a communication function; the first communication control circuit 221 can also be used to communicate with the power supply device 210 to negotiate the output power of the power supply device 210.

As mentioned above, the wireless charging device 220 provided in this application embodiment can continuously adjust the transmission power of the wireless transmitting circuit 221 during the charging process, so that the output voltage and/or output current of the wireless receiving circuit 231 matches the current charging stage of the battery 232. This application embodiment does not specifically limit the method of adjusting the transmission power of the wireless transmitting circuit 221. For example, the first communication control circuit 222 can communicate with the power supply device 210 to adjust the output voltage and/or output current of the power supply device 210, thereby adjusting the transmission power of the wireless transmitting circuit 221. Alternatively, the first communication control circuit 222 can adjust the amount of power extracted by the wireless transmitting circuit 221 from the maximum output power provided by the power supply device 210, thereby adjusting the transmission power of the wireless transmitting circuit 221. The method of adjusting the transmission power of the wireless transmitting circuit 221 will be described in detail below with reference to Figures 4 and 5.

Referring to Figure 4, optionally, as an embodiment, the first communication control circuit 221 can communicate with the power supply device 210 to negotiate the maximum output power of the power supply device 210. During the process of the wireless transmitting circuit 221 wirelessly charging the device 230 to be charged according to the maximum output power of the power supply device 210, the first communication control circuit 222 can adjust the amount of power extracted by the wireless transmitting circuit 221 from the maximum output power to adjust the transmission power of the wireless transmitting circuit 221.

In this embodiment, the first communication control circuit 222 communicates with the power supply device 210 with adjustable output power to negotiate the maximum output power of the power supply device 210. After negotiation, the power supply device 210 can provide output voltage and output current to the wireless charging device 220 according to the maximum output power. During charging, the first communication control circuit 222 can extract a certain amount of power from the maximum output power for wireless charging as needed. That is, in this embodiment, the control of adjusting the transmission power of the wireless transmitting circuit 221 is assigned to the first communication control circuit 222. The first communication control circuit 222 can immediately adjust the transmission power of the wireless transmitting circuit 221 after receiving feedback information from the device to be charged 230, which has the advantages of fast adjustment speed and high efficiency.

This application embodiment does not specifically limit the method by which the first communication control circuit 222 adjusts the transmission power of the wireless transmission circuit 221. For example, a power adjustment circuit can be provided inside the first communication control circuit 222, inside the wireless transmission circuit 221, or between the first communication control circuit 222 and the wireless transmission circuit 221. This power adjustment circuit can be connected to the transmitting coil or transmitting antenna to adjust the power received by the transmitting coil or transmitting antenna. This power adjustment circuit may, for example, include a pulse width modulation (PWM) controller and a switching unit. 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 issued by the PWM controller and/or by controlling the switching frequency of the switching unit.

It should be noted that, in the embodiment shown in Figure 4, as an alternative, the power supply device 210 can also be a power supply device with a fixed output power and a relatively large output power (e.g., 40W). In this way, the first communication control circuit 222 can directly adjust the amount of power extracted by the wireless transmission circuit 221 from the fixed power provided by the power supply device 210 without needing to negotiate its maximum output power with the power supply device 210.

Referring to Figure 5, optionally, in some embodiments, the first communication control circuit 221 can communicate with the power supply device 210 to adjust the output voltage and/or output current of the power supply device 210, thereby adjusting the transmission power of the wireless transmission circuit 221. Further, in some embodiments, the first communication control circuit 222 can be connected to the wireless transmission circuit 221, thereby controlling the wireless transmission circuit 221 to start operating, or controlling the wireless transmission circuit 221 to stop operating when an abnormality occurs during the wireless charging process. Alternatively, in some embodiments, the first communication control circuit 222 may not be connected to the wireless transmission circuit 221.

Unlike the embodiment in Figure 4, the embodiment in Figure 5 assigns control over adjusting the transmission power of the wireless transmitting circuit 221 to the power supply device 210. The power supply device 210 adjusts the transmission power of the wireless transmitting circuit 221 by changing the output voltage and/or output current. The advantage of this adjustment method is that the power supply device 210 provides only the power required by the wireless charging device 220, eliminating power waste.

In the embodiment shown in Figure 5, the wireless charging device 220 can actively determine whether it is necessary to adjust the output voltage and/or output current of the power supply device 210. In other embodiments, the wireless charging device 220 can act as a bridge for communication between the power supply device 210 and the device to be charged 230, primarily responsible for forwarding information between the two.

For example, during wireless charging, the first communication control circuit 222 communicates with the device to be charged 230 to determine whether it is necessary to adjust the output voltage and/or output current of the power supply device 210; if it is necessary to adjust the output voltage and/or output current of the power supply device 210, the first communication control circuit 222 communicates with the power supply device 210 to instruct the power supply device 210 to adjust the output voltage and/or output current of the power supply device 210.

For example, during wireless charging, the communication control circuit 222 inside the wireless charging device 220 communicates wirelessly with the device to be charged 230 to obtain adjustment information. The adjustment information is used to instruct the output voltage and/or output current of the power supply device 210 to be adjusted. The first communication control circuit 222 communicates with the power supply device 210 and sends the adjustment information to the power supply device 210 so that the power supply device 210 can adjust the output voltage and/or output current of the power supply device according to the adjustment information.

It should be understood that, similar to the communication method between the wireless charging device 220 and the device to be charged 230, the communication between the wireless charging device 220 (or the first communication control circuit 222) and the power supply device 210 can be one-way communication or two-way communication. This application embodiment does not specifically limit this.

It should also be understood that the output current of the power supply device can be constant DC, pulsating DC or AC, and the embodiments of this application do not specifically limit this.

The above example illustrates the connection between the wireless charging device 220 and the power supply device 210, with the device obtaining power from the power supply device 210. However, the embodiments of this application are not limited to this. The wireless charging device 220 can also integrate the functions of an adapter, thereby directly converting externally input AC power (such as mains power) into the aforementioned electromagnetic signals. For example, the functions of an adapter can be integrated into the wireless transmitting circuit 221 of the wireless charging device 220. For instance, a rectifier circuit, a primary filter circuit, and/or a transformer can be integrated into the wireless transmitting circuit 221. In this way, the wireless transmitting circuit 221 can be used to receive externally input AC power (such as 220V AC power, or mains power) and generate electromagnetic signals based on the AC power.

In this embodiment, an adapter-like function is integrated into the wireless charging device 220, so that the wireless charging device 220 does not need to obtain power from an external power supply device, thereby improving the integration of the wireless charging device 220 and reducing the number of components required to implement the wireless charging process.

Optionally, in some embodiments, the wireless charging device 220 may support a first wireless charging mode and a second wireless charging mode. In the first wireless charging mode, the maximum transmission power of the wireless transmitting circuit is greater than the maximum transmission power of the wireless transmitting circuit in the second wireless charging mode. The wireless charging device 220 charges the device 230 to be charged faster in the first wireless charging mode than it does in the second wireless charging mode. In other words, compared to the wireless charging device 220 operating in the second wireless charging mode, the wireless charging device 220 operating in the first wireless charging mode takes less time to fully charge the battery of the device 230 to be charged with the same capacity.

The second wireless charging mode can be called the normal wireless charging mode, such as the traditional wireless charging mode based on the Qi, PMA, or A4WP standards. The first wireless charging mode can be the fast wireless charging mode. This normal wireless charging mode refers to a wireless charging mode where the transmission power of the wireless charging device 220 is relatively low (usually less than 15W, commonly 5W or 10W). In normal wireless charging mode, fully charging a large-capacity battery (such as a 3000mAh battery) typically takes several hours; while in fast wireless charging mode, the transmission power of the wireless charging device 220 is relatively high (usually greater than or equal to 15W). Compared to the normal wireless charging mode, the charging time required to fully charge the same capacity battery in fast wireless charging mode is significantly shortened, and the charging speed is much faster.

Optionally, in some embodiments, the first communication control circuit 222 communicates bidirectionally with the second communication control circuit 235 to control the transmission power of the wireless charging device 220 in the first wireless charging mode.

Furthermore, in some embodiments, the process of the first communication control circuit 222 and the second communication control circuit 235 communicating bidirectionally to control the transmission power of the wireless charging device 220 in the first wireless charging mode may include: the first communication control circuit 222 and the second communication control circuit 235 communicating bidirectionally to negotiate the wireless charging mode between the wireless charging device 220 and the device to be charged 230.

Specifically, the first communication control circuit 222 can perform handshake communication with the second communication control circuit 235. If the handshake communication is successful, the wireless charging device 220 is controlled to use the first wireless charging mode to charge the device 230. If the handshake communication fails, the wireless charging device 220 is controlled to use the second wireless charging mode to charge the device 230.

Handshake communication refers to the identification of each other by the communicating parties. A successful handshake indicates that both the wireless charging device 220 and the device to be charged 230 support the adjustable transmission power wireless charging method provided in this embodiment. A failed handshake indicates that at least one of the wireless charging device 220 and the device to be charged 230 does not support the adjustable transmission power wireless charging method provided in this embodiment.

In this embodiment, the wireless charging device 220 does not blindly adopt the first wireless charging mode to quickly wirelessly charge the device 230 to be charged. Instead, it communicates bidirectionally with the device 230 to negotiate whether the wireless charging device 220 can adopt the first wireless charging mode to quickly wirelessly charge the device 230 to be charged. This can improve the safety of the charging process.

Specifically, the first communication control circuit 222 and the second communication control circuit 235 conduct bidirectional wireless communication to negotiate the wireless charging mode between the wireless charging device 220 and the device to be charged 230. This may include: the first communication control circuit 222 sending a first instruction to the second communication control circuit 235, the first instruction being used to inquire whether the device to be charged 230 should activate the first wireless charging mode; the first communication control circuit 222 receiving a reply instruction from the second communication control circuit 235 in response to the first instruction, the reply instruction being used to indicate whether the device to be charged 230 agrees to activate the first wireless charging mode; and if the device to be charged 230 agrees to activate the first wireless charging mode, the first communication control circuit 222 controlling the wireless charging device 220 to charge the device to be charged 230 using the first wireless charging mode.

In addition to determining the wireless charging mode based on communication negotiation, the first communication control circuit 222 can also select or switch the wireless charging mode according to some other factors. For example, the first communication control circuit 222 can also be used to control the wireless charging device 220 to charge the battery 232 using the first wireless charging mode or the second wireless charging mode according to the temperature of the battery 232.

For example, when the temperature is below a preset first threshold (e.g., 5°C or 10°C), the first communication control circuit 222 can control the wireless charging device 220 to use a second wireless charging mode for normal charging. When the temperature is greater than or equal to the first threshold, the first communication control circuit 222 can control the wireless charging device 220 to use a first wireless charging mode for fast charging. Furthermore, when the temperature is above a high-temperature threshold (e.g., 50°C), the first communication control circuit 222 can control the wireless charging device 220 to stop charging.

It should be noted that the adjustable-power wireless charging method provided in this application embodiment can be used to control one or more charging stages of the battery 232. For example, the adjustable-power wireless charging method provided in this application embodiment can be mainly used to control the constant-current charging stage of the battery 232. In other embodiments, the device to be charged 230 can retain a conversion circuit, and when the battery is in the trickle charging stage and the constant-voltage charging stage, it can be charged using a traditional wireless charging method similar to that shown in Figure 1. Specifically, when the battery 232 is in the trickle charging stage and the constant-voltage charging stage, the conversion circuit in the device to be charged 230 can convert the output voltage and output current of the wireless receiving circuit 231 to meet the charging requirements of the trickle charging stage and the constant-voltage charging stage. Compared with the constant-current charging stage, the charging power received by the battery 232 in the trickle charging stage and the constant-voltage charging stage is smaller, and the efficiency conversion loss and heat accumulation of the conversion circuit inside the device to be charged 230 are acceptable. A detailed description is provided below with reference to Figure 6.

As shown in Figure 6, the device to be charged 230 may further include a second charging channel 236. A conversion circuit 237 may be installed on the second charging channel 236. The conversion circuit 237 can receive the output voltage and output current of the wireless receiving circuit 231, convert the output voltage and/or output current of the wireless receiving circuit 231, and charge the battery 232 based on the converted voltage and/or current. A 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. For example, as shown in Figure 6, a switch 238 may be installed on the first charging channel 233, and the second communication control circuit 235 can control the switching between the first charging channel 233 and the second charging channel 236 by controlling the on and off states of the switch 238.

For example, when battery 232 is in the trickle charging stage and/or constant voltage charging stage, the second communication control circuit 235 can control the use of the second charging channel 236 to charge battery 232, and the constant voltage and constant current process of the battery can be controlled by the conversion circuit 237 (such as a charging IC). When battery 232 is in the constant current charging stage, the first charging channel 233 can be used to charge battery 232, and the constant current control of the battery can be achieved based on the adjustment of the transmission power of the wireless charging device. Retaining the conversion circuit 237 can better ensure compatibility with traditional wireless charging methods.

In one embodiment, the device to be charged further includes a buck circuit disposed on the first charging channel. This buck circuit receives the output voltage of the wireless receiving circuit and performs a voltage reduction process on the output voltage of the wireless receiving circuit to charge the battery. In embodiments of this disclosure, the buck circuit can be implemented in various forms. As an example, the buck circuit can be a Buck circuit. As another example, the buck circuit can be a charge pump. A charge pump consists of multiple switching devices; the heat generated by the current flowing through the switching devices is very small, almost equivalent to the heat generated by the current flowing directly through a wire. Therefore, using a charge pump as a buck circuit not only achieves a voltage reduction effect but also generates less heat. As an example, the buck circuit can also be a half-voltage circuit. The ratio of the output voltage to the input voltage of the half-voltage circuit is fixed, thereby stabilizing the voltage difference of the buck circuit and reducing the heat generated by the buck circuit.

In embodiments of this disclosure, the output voltage and/or output current on the first charging channel may refer to the voltage and/or current between the wireless receiving circuit and the buck circuit, i.e., the output voltage and/or current of the wireless receiving circuit. Alternatively, the output voltage and/or output current on the first charging channel may also refer to the voltage and/or current between the buck circuit and the battery, i.e., the output voltage and/or output current of the buck circuit, or the voltage and/or current entering the battery. Furthermore, if the first charging channel does not have a buck circuit, the output voltage and/or output current on the first charging channel may refer to the output voltage and/or current of the wireless receiving circuit, or the voltage and/or current entering the battery.

Compared to related technologies, the wireless charging device and the device to be charged in this application embodiment communicate via the aforementioned wireless communication method, eliminating the need for the transmitting and receiving coils used for charging to perform communication tasks, thereby eliminating the output voltage ripple problem caused by coil communication. Furthermore, the voltage ripple output by the wireless receiving coil, if not processed, can lead to charging safety issues. This application embodiment eliminates voltage ripple, thereby eliminating the need for ripple processing circuits, reducing the complexity of the charging circuit of the device to be charged, improving charging efficiency, and saving circuit space. When charging the battery through the first charging channel, only a step-down circuit can be provided on the first charging channel. Moreover, since the device to be charged provides real-time feedback information such as the voltage, current, or power entering the battery to the wireless charging device, the wireless charging device can adjust the transmission power in real time. In addition, with the elimination of the voltage ripple effect, the step-down circuit can use a half-voltage circuit, further reducing circuit complexity, which is beneficial for controlling temperature rise and improving charging efficiency.

It should be noted that there are multiple ways to select the first charging channel 233 and the second charging channel 236, and it is not limited to selecting based on the current charging stage of the battery 232.

Optionally, in some embodiments, the second communication control circuit 235 can also be used to perform handshake communication with the first communication control circuit 222 via wireless communication. If the handshake communication is successful, it controls the first charging channel 233 to work, and if the handshake communication fails, it controls the second charging channel 236 to work.

Handshake communication refers to the identification of each other by the communicating parties. Successful handshake communication indicates that both the wireless charging device 220 and the device to be charged 230 support the adjustable transmission power wireless charging method provided in this embodiment. Handshake communication failure indicates that at least one of the wireless charging device 220 and the device to be charged 230 does not support the adjustable transmission power wireless charging method provided in this embodiment. In the event of handshake communication failure, charging can be performed using a traditional wireless charging method, such as a Qi-based wireless charging method, through the second charging channel 236.

Optionally, in other embodiments, 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 according to the temperature of the battery 232.

For example, when the temperature is below a preset first threshold (e.g., 5°C or 10°C), the second communication control circuit 235 can control the use of the second charging channel 236 for normal wireless charging. When the temperature is greater than or equal to the first threshold, the second communication control circuit 235 can control the use of the first charging channel 233 for fast wireless charging. Furthermore, when the temperature is above a high-temperature threshold (e.g., 50°C), the second communication control circuit 235 can control the wireless charging to stop.

As mentioned above, the output current of the wireless receiving circuit 231 can be pulsating DC, which can reduce lithium plating in the battery 232 and improve battery life. When the output of the wireless receiving circuit 231 is pulsating DC, the second communication control circuit 235 can detect the peak or average value of the pulsating DC through the detection circuit 234, and then perform subsequent communication or control based on the peak or average value of the pulsating DC.

Taking the detection circuit 234 detecting the peak value of the pulsating DC current as an example, as shown in Figure 7, the detection circuit 234 may include: a sample-and-hold circuit 2341, which is used to sample the pulsating DC current when the sample-and-hold circuit 2341 is in the sampling state, and to hold the peak value of the pulsating DC current when the sample-and-hold circuit 2341 is in the holding state; the second communication control circuit 235 is also used to determine whether the sample-and-hold circuit 2341 is in the holding state, and to acquire the peak value of the pulsating DC current held by the sample-and-hold circuit 2341 when it is determined that the sample-and-hold circuit 2341 is in the holding state.

Optionally, in some embodiments, the sample-and-hold circuit 2341 may include a capacitor, and the sample-and-hold circuit 2341 may hold the peak value of the pulsating DC current based on the capacitor in the sample-and-hold circuit 2341. The detection circuit 234 may also include a discharge circuit 2342, and the second communication control circuit 235 may release the charge on both ends of the capacitor in the sample-and-hold circuit 2341 through the discharge circuit 2342, thereby causing the sample-and-hold circuit 2341 to switch from the holding state to the sampling state.

Optionally, in some embodiments, the wireless charging device 220 may further include an external interface and a wireless data transmission circuit. The external interface can be used to connect to an electronic device with data processing and transmission functions. This external interface can be the aforementioned charging interface or other interfaces. The first communication control unit 222 can also be used to wirelessly charge the device to be charged 230 according to the output power of the electronic device during the connection between the external interface and the electronic device with data processing and transmission functions. The wireless data transmission circuit can be used to transmit data stored in the electronic device to the device to be charged 230 via a wireless link, or transmit data stored in the device to be charged to the electronic device 230 via a wireless link, during the wireless charging control unit's wireless charging of the device to be charged 230 according to the output power of the electronic device. The wireless data transmission circuit is used to transmit at least one of the following data: data in USB protocol format, data in display port (DP) protocol format, and data in mobile high-definition link (MHL) protocol format.

The embodiments of this application are described in more detail below with specific examples. Figure 8 illustrates an example where the wireless charging device is a wireless charging base, the power supply device is an adapter, and the device to be charged is a mobile phone. It should be noted that the example in Figure 8 is merely to help those skilled in the art understand the embodiments of this application, and is not intended to limit the embodiments of this application to the specific values or scenarios illustrated. Those skilled in the art can obviously make various equivalent modifications or variations based on the example in Figure 8, and such modifications or variations also fall within the scope of the embodiments of this application.

Step 1: Establish wireless communication between the mobile phone and the wireless charging dock.

Specifically, the communication protocol for bidirectional communication between the phone and the wireless charging dock can be customized by the manufacturer. Furthermore, the phone and wireless charging dock can communicate via Bluetooth, WiFi, or backscatter modulation.

Step 2: The wireless charging base and the adapter establish a wired two-way communication.

Specifically, the communication protocol for bidirectional communication between the wireless charging dock and the adapter can be customized by the manufacturer. Furthermore, the wireless charging dock and the adapter can communicate via a USB cable (e.g., via the D+ and D- data lines in the USB cable).

Step 3: Connect the wireless charging base to the adapter and establish a communication handshake with the adapter.

Specifically, after the wireless charging dock is connected to the adapter, it can communicate with the adapter to determine the type of adapter and the power level that the adapter can provide.

Step 4: Connect the wireless charging base to the phone and establish a communication handshake with the phone.

Specifically, after the wireless charging dock is connected to the phone, it can communicate and handshake with the phone to determine the phone type and the power level that the phone can support.

Step 5: Once the wireless charging base successfully connects with the phone and adapter, wireless charging will begin.

The phone's internal wireless receiving circuitry can directly charge the battery. To adjust the output current or voltage of the wireless receiving circuitry based on the battery's current charging stage, the phone's internal communication control circuitry maintains communication with the wireless charging dock during wireless charging, instructing the dock to adjust the transmission power of its wireless transmitting circuitry in real time. For example, the phone's communication control circuitry can acquire the battery's current state in real time and send adjustment information to the wireless charging device based on that state. This adjustment information is used to adjust the adapter's output voltage or current. After receiving this adjustment information, the wireless charging device can communicate bidirectionally with the adapter to instruct it to adjust its output voltage and/or output current.

It should be noted that if the wireless charging dock fails to establish a handshake with either the phone or the adapter, the wireless charging dock can still use traditional wireless charging methods. For example, the wireless charging dock can be based on the Qi standard and use a power of 5W (5W corresponds to the low power level in the Qi standard) to wirelessly charge the device.

In one embodiment of this disclosure, the wireless transmitting circuit includes an inverter circuit and a resonant circuit. The inverter circuit may include multiple switching transistors, and the output power can be adjusted by controlling the on-time (duty cycle) of the switching transistors. The resonant circuit, used to transmit electrical energy, may include, for example, a capacitor and a transmitting coil. The output power of the wireless transmitting circuit can be adjusted by changing the resonant frequency of the resonant circuit.

In one embodiment of this disclosure, the wireless charging device further includes: a voltage conversion circuit. The voltage conversion circuit receives an input voltage provided by a power supply device and converts the input voltage to obtain an output voltage and an output current. A wireless transmitting circuit is also included, used to transmit electromagnetic signals based on the output voltage and current of the voltage conversion circuit. For example, the voltage conversion circuit may be a Boost converter or a Buck converter.

In one embodiment, a first communication control circuit is used to adjust the output voltage and/or output current of the voltage conversion circuit to adjust the transmission power of the wireless transmission circuit.

In one embodiment, a first communication control circuit is used to adjust the duty cycle of the inverter circuit and/or adjust the resonant frequency of the resonant circuit to adjust the transmission power of the wireless transmission circuit. In one embodiment of this disclosure, the battery of the device to be charged may include a single cell or multiple cells. When the battery includes multiple cells, the multiple cells are connected in series. Therefore, the charging voltage that the battery can withstand is the sum of the charging voltages that the multiple cells can withstand, which can improve the charging speed and reduce charging heat generation.

Taking a mobile phone as an example, when the battery of the device to be charged consists of a single cell, the voltage of that single cell is typically between 3.0V and 4.35V. However, when the battery consists of two cells connected in series, the total voltage of the two cells is 6.0V to 8.7V. Therefore, compared to a single cell, using multiple cells connected in series can increase the output voltage of the wireless receiving circuit. Compared to a single cell, to achieve the same charging speed, the charging current required by multiple cells is approximately 1/N of the charging current required by a single cell (where N is the number of cells connected in series within the device to be charged). In other words, while maintaining the same charging speed (same charging power), using a multi-cell approach can reduce the charging current, thereby reducing the heat generated by the device during charging. Furthermore, compared to a single-cell approach, while keeping the charging current constant, using a multi-cell series approach can increase the charging voltage, thus increasing the charging speed.

The device embodiments of this application have been described in detail above with reference to Figures 2-8. The method embodiments of this application will be described in detail below with reference to Figures 9-11. The method embodiments correspond to the device embodiments, so any parts not described in detail can be referred to the previous device embodiments.

Accordingly, this application also provides a wireless charging method applied to a wireless charging device, the method comprising:

During the wireless charging process of the device to be charged, wireless communication is established with the device.

The wireless communication methods include any one or more of the following: Bluetooth communication, Wi-Fi communication, short-range wireless communication based on high carrier frequency, optical communication, ultrasonic communication, ultra-wideband communication, and mobile communication.

Accordingly, this application also provides a wireless charging method applied to a device to be charged, the method comprising:

During the wireless charging process of the battery, wireless communication is conducted with the wireless charging device. The wireless communication methods include any one or more of the following: Bluetooth communication, Wi-Fi communication, short-range wireless communication based on high carrier frequency, optical communication, ultrasonic communication, ultra-wideband communication, and mobile communication.

Figure 9 is a schematic flowchart of a wireless charging method provided in one embodiment of this application. The method in Figure 9 can be executed by a wireless charging system (such as the wireless charging system 200 mentioned above). The wireless charging system includes a wireless charging device and a device to be charged.

The wireless charging device includes:

A wireless transmitting circuit is used to transmit electromagnetic signals to wirelessly charge the device to be charged.

The device to be charged includes:

Battery;

A wireless receiving circuit is used to receive the electromagnetic signal and convert the electromagnetic signal into the output voltage and output current of the wireless receiving circuit.

The first charging channel is used to receive the output voltage and output current of the wireless receiving circuit, and to charge the battery based on the output voltage and output current of the wireless receiving circuit.

A detection circuit is used to detect the output voltage and/or output current of the wireless receiving circuit.

The method shown in Figure 9 includes:

910. The device to be charged communicates wirelessly with the wireless charging device based on the output voltage and/or output current of the wireless receiving circuit detected by the detection circuit, so that the wireless charging device adjusts the transmission power of the wireless transmitting circuit so that the output voltage and/or output current of the wireless receiving circuit matches the current charging stage of the battery.

Optionally, in some embodiments, the wireless charging device further includes a charging interface; the wireless transmitting circuit is also configured to receive the output voltage and output current of the power supply device through the charging interface, and generate the electromagnetic signal based on the output voltage and output current of the power supply device.

Optionally, in some embodiments, the method of FIG9 may further include: the wireless charging device communicating with the power supply device to negotiate the output power of the power supply device.

Optionally, in some embodiments, the wireless charging device communicating with the power supply device to negotiate the output power of the power supply device may include: the wireless charging device communicating with the power supply device to negotiate the maximum output power of the power supply device; the wireless charging device adjusting the transmission power of the wireless transmitting circuit may include: during the process of the wireless transmitting circuit wirelessly charging the device to be charged according to the maximum output power of the power supply device, the wireless charging device adjusting the amount of power extracted by the wireless transmitting circuit from the maximum output power to adjust the transmission power of the wireless transmitting circuit.

Optionally, in some embodiments, adjusting the transmission power of the wireless transmitting circuit may include: the wireless charging device communicating with the power supply device to adjust the output voltage and/or output current of the power supply device, thereby adjusting the transmission power of the wireless transmitting circuit.

Optionally, in some embodiments, the device to be charged communicating wirelessly with the wireless charging device based on the output voltage and/or output current of the wireless receiving circuit detected by the detection circuit, so that the wireless charging device adjusts the transmission power of the wireless transmitting circuit, may include: the device to be charged sending adjustment information to the wireless charging device, the adjustment information being used to instruct the wireless charging device to adjust the output voltage and/or output current of the power supply device.

Optionally, in some embodiments, the current charging stage of the battery includes at least one of a trickle charging stage, a constant voltage charging stage, and a constant current charging stage.

Optionally, in some embodiments, the device to be charged communicates wirelessly with the wireless charging device based on the output voltage and/or output current of the wireless receiving circuit detected by the detection circuit, so that the wireless charging device adjusts the transmission power of the wireless transmitting circuit based on the output voltage and/or output current of the wireless receiving circuit. This may include: during the constant voltage charging phase of the battery, the device to be charged communicates wirelessly with the wireless charging device based on the output voltage and/or output current of the wireless receiving circuit detected by the detection circuit, so that the wireless charging device adjusts the transmission power of the wireless transmitting circuit so that the output voltage of the wireless receiving circuit matches the charging voltage corresponding to the constant voltage charging phase.

Optionally, in some embodiments, the device to be charged communicates wirelessly with the wireless charging device based on the output voltage and/or output current of the wireless receiving circuit detected by the detection circuit, so that the wireless charging device adjusts the transmission power of the wireless transmitting circuit based on the output voltage and/or output current of the wireless receiving circuit. This may include: during the constant current charging phase of the battery, the device to be charged communicates wirelessly with the wireless charging device based on the output voltage and/or output current of the wireless receiving circuit detected by the detection circuit, so that the wireless charging device adjusts the transmission power of the wireless transmitting circuit so that the output current of the wireless receiving circuit matches the charging current corresponding to the constant current charging phase.

Optionally, in some embodiments, the method of FIG9 may further include: the device to be charged sending battery status information to the wireless charging device, so that the wireless charging device adjusts the transmission power of the wireless transmitting circuit according to the battery status information, wherein the battery status information includes the current charge and/or current voltage of the battery in the device to be charged.

Optionally, in some embodiments, the communication information between the wireless charging device and the device to be charged includes at least one of the following: temperature information of the battery; information indicating the peak or average value of the output voltage and/or output current of the wireless receiving circuit; indication information for entering overvoltage protection or overcurrent protection; and power transmission efficiency information for indicating the power transmission efficiency between the wireless transmitting circuit and the wireless receiving circuit.

Optionally, in some embodiments, the communication information includes the power transmission efficiency information, and the method of FIG9 may further include: the wireless charging device determining the adjustment range of the transmission power of the wireless transmitting circuit based on the power transmission efficiency information.

Optionally, in some embodiments, the device to be charged further includes: a second charging channel, on which a conversion circuit is provided, the conversion circuit being used to receive the output current of the wireless receiving circuit, convert the output current of the wireless receiving circuit, and charge the battery based on the converted current; the method of FIG9 may further include: the device to be charged controlling the switching between the first charging channel and the second charging channel.

Optionally, in some embodiments, the method of FIG9 may further include: the device to be charged and the wireless charging device performing a handshake communication; if the handshake communication is successful, controlling the first charging channel to operate; and if the handshake communication fails, controlling the second charging channel to operate.

Optionally, in some embodiments, the method of FIG9 may further include: the device to be charged controlling the switching between the first charging channel and the second charging channel according to the temperature of the battery.

Optionally, in some embodiments, the wireless charging device supports a first wireless charging mode and a second wireless charging mode, wherein the wireless charging device charges the device to be charged faster in the first wireless charging mode than the wireless charging device charges the device to be charged in the second wireless charging mode.

Optionally, in some embodiments, the method of FIG9 may further include: the wireless charging device and the device to be charged communicating to negotiate the use of the first wireless charging mode or the second wireless charging mode for wireless charging.

Optionally, in some embodiments, the wireless charging device and the device to be charged communicating to negotiate the use of the first wireless charging mode or the second wireless charging mode for wireless charging may include: the wireless charging device and the device to be charged performing a handshake communication; if the handshake communication is successful, controlling the wireless charging device to use the first wireless charging mode to charge the device to be charged; if the handshake communication fails, controlling the wireless charging device to use the second wireless charging mode to charge the device to be charged.

Optionally, in some embodiments, the method of FIG9 may further include: the wireless charging device controlling the wireless charging device to charge the battery using the first wireless charging mode or the second wireless charging mode according to the temperature of the battery.

Figure 10 is a schematic flowchart of a wireless charging method according to another embodiment of this application. The method of Figure 10 can be executed by a wireless charging device (such as the wireless charging device 220 mentioned above). The wireless charging device includes: a wireless transmitting circuit for transmitting electromagnetic signals to wirelessly charge the device to be charged;

The method in Figure 10 includes:

1010. During the wireless charging process, wireless communication is conducted with the device to be charged to adjust the transmission power of the wireless transmitting circuit so that the output voltage and/or output current of the wireless receiving circuit in the device to be charged matches the current charging stage of the battery in the device to be charged.

The wireless communication method includes any one or more of the following: Bluetooth communication, Wi-Fi communication, short-range wireless communication based on high carrier frequency, optical communication, ultrasonic communication, ultra-wideband communication, and mobile communication.

Optionally, in some embodiments, the wireless charging device further includes a charging interface; the wireless transmitting circuit is also configured to receive the output voltage and output current of the power supply device through the charging interface, and generate the electromagnetic signal based on the output voltage and output current of the power supply device.

Optionally, in some embodiments, the method of FIG10 may further include: communicating with the power supply device to negotiate the output power of the power supply device.

Optionally, in some embodiments, communicating with the power supply device to negotiate the output power of the power supply device may include: communicating with the power supply device to negotiate the maximum output power of the power supply device; adjusting the transmission power of the wireless transmission circuit may include: during the process of the wireless transmission circuit wirelessly charging the device to be charged according to the maximum output power of the power supply device, adjusting the amount of power extracted by the wireless transmission circuit from the maximum output power to adjust the transmission power of the wireless transmission circuit.

Optionally, in some embodiments, adjusting the transmission power of the wireless transmitting circuit may include: communicating with the power supply device to adjust the output voltage and/or output current of the power supply device, thereby adjusting the transmission power of the wireless transmitting circuit.

Optionally, in some embodiments, the step of wirelessly communicating with the device to be charged during the wireless charging process to adjust the transmission power of the wireless transmitting circuit may include: receiving adjustment information sent by the device to be charged, the adjustment information being used to instruct the wireless charging device to adjust the output voltage and/or output current of the power supply device.

Optionally, in some embodiments, the current charging stage of the battery includes at least one of a trickle charging stage, a constant voltage charging stage, and a constant current charging stage.

Optionally, in some embodiments, the step of wirelessly communicating with the device to be charged during the wireless charging process to adjust the transmission power of the wireless transmitting circuit so that the output voltage and/or output current of the wireless receiving circuit in the device to be charged matches the current charging stage of the battery may include: wirelessly communicating with the device to be charged during the constant voltage charging stage of the battery to adjust the transmission power of the wireless transmitting circuit so that the output voltage of the wireless receiving circuit matches the charging voltage corresponding to the constant voltage charging stage.

Optionally, in some embodiments, the step of wirelessly communicating with the device to be charged during the wireless charging process to adjust the transmission power of the wireless transmitting circuit so that the output voltage and/or output current of the wireless receiving circuit in the device to be charged matches the current charging stage of the battery may include: wirelessly communicating with the device to be charged during the constant current charging stage of the battery to adjust the transmission power of the wireless transmitting circuit so that the output current of the wireless receiving circuit matches the charging current corresponding to the constant current charging stage.

Optionally, in some embodiments, the method of FIG10 may further include: receiving battery status information sent by the device to be charged, and adjusting the transmission power of the wireless transmitting circuit according to the battery status information, wherein the battery status information includes the current charge and/or current voltage of the battery.

Optionally, in some embodiments, the communication information between the wireless charging device and the device to be charged includes at least one of the following: temperature information of the battery; information indicating the peak or average value of the output voltage and/or output current of the wireless receiving circuit; indication information for entering overvoltage protection or overcurrent protection; and power transmission efficiency information for indicating the power transmission efficiency between the wireless transmitting circuit and the wireless receiving circuit.

Optionally, in some embodiments, the communication information includes the power transmission efficiency information, and the method of FIG10 may further include: determining the adjustment range of the transmission power of the wireless transmission circuit based on the power transmission efficiency information.

Optionally, in some embodiments, the wireless charging device supports a first wireless charging mode and a second wireless charging mode, wherein the wireless charging device charges the device to be charged faster in the first wireless charging mode than the wireless charging device charges the device to be charged in the second wireless charging mode.

Optionally, in some embodiments, the method of FIG10 may further include: communicating with the device to be charged to negotiate wireless charging using the first wireless charging mode or the second wireless charging mode.

Optionally, in some embodiments, communicating with the device to be charged to negotiate the use of the first wireless charging mode or the second wireless charging mode for wireless charging may include: performing a handshake communication with the device to be charged; if the handshake communication is successful, controlling the wireless charging device to charge the device to be charged using the first wireless charging mode; if the handshake communication fails, controlling the wireless charging device to charge the device to be charged using the second wireless charging mode.

Optionally, in some embodiments, the method of FIG10 may further include: controlling the wireless charging device to charge the device to be charged using the first wireless charging mode or the second wireless charging mode according to the temperature of the battery.

Figure 11 is a schematic flowchart of a wireless charging method according to another embodiment of this application. The method of Figure 11 can be performed by a device to be charged (such as device 230 mentioned above). The device to be charged includes: a battery; a wireless receiving circuit for receiving electromagnetic signals emitted by a wireless charging device and converting the electromagnetic signals into an output voltage and an output current of the wireless receiving circuit; a first charging channel for receiving the output voltage and output current of the wireless receiving circuit and charging the battery based on the output voltage and output current of the wireless receiving circuit; and a detection circuit for detecting the output voltage and/or output current of the wireless receiving circuit.

The method in Figure 11 includes:

1110. Based on the output voltage and/or output current of the wireless receiving circuit detected by the detection circuit, wireless communication is established with the wireless charging device to adjust the transmission power of the wireless charging device so that the output voltage and/or output current of the wireless receiving circuit matches the current charging stage of the battery.

The wireless communication method includes any one or more of the following: Bluetooth communication, Wi-Fi communication, short-range wireless communication based on high carrier frequency, optical communication, ultrasonic communication, ultra-wideband communication, and mobile communication.

Optionally, in some embodiments, the step of wirelessly communicating with the wireless charging device based on the output voltage and/or output current of the wireless receiving circuit detected by the detection circuit to adjust the transmission power of the wireless charging device includes:

The wireless charging device is sent adjustment information, which instructs the wireless charging device to adjust the output voltage and/or output current of the power supply device.

Optionally, in some embodiments, the current charging stage of the battery includes at least one of a trickle charging stage, a constant voltage charging stage, and a constant current charging stage.

Optionally, in some embodiments, the step of wirelessly communicating with the wireless charging device based on the output voltage and/or output current of the wireless receiving circuit detected by the detection circuit to adjust the transmission power of the wireless charging device so that the output voltage and/or output current of the wireless receiving circuit matches the current charging stage of the battery may include: during the constant voltage charging stage of the battery, wirelessly communicating with the wireless charging device based on the output voltage and/or output current of the wireless receiving circuit detected by the detection circuit to adjust the transmission power of the wireless charging device so that the output voltage of the wireless receiving circuit matches the charging voltage corresponding to the constant voltage charging stage.

Optionally, in some embodiments, the step of wirelessly communicating with the wireless charging device based on the output voltage and/or output current of the wireless receiving circuit detected by the detection circuit to adjust the transmission power of the wireless charging device so that the output voltage and/or output current of the wireless receiving circuit matches the current charging stage of the battery may include: during the constant current charging stage of the battery, wirelessly communicating with the wireless charging device based on the output voltage and/or output current of the wireless receiving circuit detected by the detection circuit to adjust the transmission power of the wireless charging device so that the output current of the wireless receiving circuit matches the charging current corresponding to the constant current charging stage.

Optionally, in some embodiments, the method of FIG11 may further include: sending battery status information to the wireless charging device so that the wireless charging device adjusts the transmission power of the wireless transmitting circuit according to the battery status information, wherein the battery status information includes the current charge and/or current voltage of the battery in the device to be charged.

Optionally, in some embodiments, the communication information between the device to be charged and the wireless charging device includes at least one of the following: temperature information of the battery; information indicating the peak or average value of the output voltage and/or output current of the wireless receiving circuit; indication information for entering overvoltage protection or overcurrent protection; and power transmission efficiency information for indicating the power transmission efficiency between the wireless charging device and the wireless receiving circuit.

Optionally, in some embodiments, the device to be charged may further include: a second charging channel, on which a conversion circuit is provided, the conversion circuit being used to receive the output current of the wireless receiving circuit, convert the output current of the wireless receiving circuit, and charge the battery based on the converted current; the method of FIG11 may further include: controlling the switching between the first charging channel and the second charging channel.

Optionally, in some embodiments, the method of FIG11 may further include: performing a handshake communication with the wireless charging device, controlling the first charging channel to operate if the handshake communication is successful, and controlling the second charging channel to operate if the handshake communication fails.

Optionally, in some embodiments, the method of FIG11 may further include: controlling the switching between the first charging channel and the second charging channel according to the temperature of the battery.

Optionally, in some embodiments, the wireless charging device supports a first wireless charging mode and a second wireless charging mode, wherein the wireless charging device charges the device to be charged faster in the first wireless charging mode than the wireless charging device charges the device to be charged in the second wireless charging mode. The method of FIG11 may further include: communicating with the wireless charging device to negotiate the use of the first wireless charging mode or the second wireless charging mode for wireless charging.

In the above embodiments, implementation can be achieved, in whole or in part, through software, hardware, firmware, or any other combination. When implemented in software, it can be implemented, in whole or in part, as a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of this application are generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions can be transmitted from one website, computer, server, or data center to another via wired (e.g., coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium accessible to a computer or a data storage device such as a server or data center that integrates one or more available media. The available media can be magnetic media (e.g., floppy disks, hard disks, magnetic tapes), optical media (e.g., digital video discs (DVDs)), or semiconductor media (e.g., solid-state drives (SSDs)).

Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

In addition, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims (38)

1. A wireless charging device, characterized in that it comprises: A communication control circuit is used to wirelessly communicate with the device to be charged during the wireless charging process, and to adjust the transmission power of the wireless charging device based on the feedback information of the device to be charged, so that the output voltage and/or output current of the wireless receiving circuit inside the device to be charged matches the current charging stage of the battery. The communication control circuit includes one or more of the following modules for wireless communication with the device to be charged: Bluetooth module, Wi-Fi module, high carrier frequency-based short-range wireless communication module, optical communication module, ultrasonic communication module, ultra-wideband communication module, and mobile communication module. A wireless transmitting circuit is used to transmit electromagnetic signals based on the output voltage and output current of the power supply device. The communication control circuit is also used to communicate with the power supply device to negotiate the maximum output power of the power supply device; during the process of the wireless transmitting circuit wirelessly charging the device to be charged according to the maximum output power of the power supply device, the communication control circuit is also used to adjust the amount of power extracted by the wireless transmitting circuit from the maximum output power to adjust the transmission power of the wireless transmitting circuit; or, The communication control circuit is also used to communicate with the power supply device during the wireless charging process to adjust the output voltage and/or output current of the power supply device, thereby adjusting the transmission power of the wireless transmission circuit. 2. The wireless charging device as described in claim 1, wherein the high carrier frequency-based short-range wireless communication module includes an IC chip with an EHF antenna internally packaged. 3. The wireless charging device as described in claim 2, wherein the high carrier frequency is 60 GHz. 4. The wireless charging device as claimed in claim 1, wherein the optical communication module includes an infrared communication module. 5. The wireless charging device as claimed in claim 1, wherein the communication control circuit is further configured to determine the wireless communication method used by the wireless communication based on the detected signal strength of each wireless communication method. 6. The wireless charging device according to any one of claims 1-5, characterized in that the communication control circuit is used to wirelessly communicate with the device to be charged during the wireless charging process, and to acquire the voltage and/or current of the battery of the device to be charged; and The transmission power of the wireless transmission circuit is adjusted according to the voltage and/or current of the battery. 7. The wireless charging device as claimed in claim 1, characterized in that the wireless charging device further comprises: A voltage conversion circuit is used to receive the input voltage provided by the power supply device and convert the input voltage to obtain the output voltage and output current of the voltage conversion circuit. The wireless transmitting circuit is used to transmit electromagnetic signals based on the output voltage and output current of the voltage conversion circuit. 8. The wireless charging device as claimed in claim 7, wherein the communication control circuit is used to adjust the output voltage and/or output current of the voltage conversion circuit to adjust the transmission power of the wireless transmitting circuit. 9. The wireless charging device according to any one of claims 7 or 8, wherein the wireless transmitting circuit comprises: an inverter circuit and a resonant circuit; The communication control circuit is used to adjust the duty cycle of the inverter circuit and/or adjust the resonant frequency of the resonant circuit to adjust the transmission power of the wireless transmission circuit. 10. The wireless charging device as described in claim 7 or 8, characterized in that the wireless charging device further comprises: Charging port; The wireless transmitting circuit is also used to receive the output voltage and output current of the power supply device through the charging interface, and generate the electromagnetic signal based on the output voltage and output current of the power supply device. 11. The wireless charging device as claimed in claim 1, characterized in that, during the wireless charging process, wirelessly communicating with the device to be charged to adjust the transmission power of the wireless transmitting circuit includes: The communication control circuit receives adjustment information sent by the device to be charged, and the adjustment information is used to instruct the communication control circuit to adjust the output voltage and/or output current of the power supply device. 12. The wireless charging device as described in claim 10, wherein the charging interface is a Universal Serial Bus (USB) interface or a Lightning interface. 13. The wireless charging device as claimed in claim 12, wherein the charging interface is a USB interface, and the communication control circuit communicates with the power supply device based on the data line in the USB interface. 14. The wireless charging device as claimed in claim 13, wherein the charging interface is a USB interface supporting the Power Transmission (PD) communication protocol, and the communication control circuit communicates with the power supply device based on the PD communication protocol. 15. The wireless charging device as claimed in claim 1, wherein the wireless transmitting circuit is further configured to receive externally input alternating current and generate the electromagnetic signal based on the alternating current. 16. The wireless charging device according to any one of claims 1-5, 7-8, 11-15, wherein the communication control circuit is further configured to wirelessly communicate with the device to be charged to receive battery status information sent by the device to be charged, and adjust the transmission power of the wireless transmitting circuit according to the battery status information, wherein the battery status information includes the current charge and/or current voltage of the battery. 17. The wireless charging device according to any one of claims 1-5, 7-8, and 11-15, characterized in that the communication information for wireless communication between the communication control circuit and the device to be charged includes at least one of the following: The temperature information of the battery; Information indicating the peak or average value of the output voltage and/or output current of the wireless receiving circuit; Indication message indicating the activation of overvoltage or overcurrent protection; Power transmission efficiency information is used to indicate the power transmission efficiency between the wireless transmitting circuit and the wireless receiving circuit. 18. The wireless charging device as claimed in claim 17, wherein the communication information includes the power transmission efficiency information, and the communication control circuit is further configured to determine the adjustment range of the transmission power of the wireless transmitting circuit based on the power transmission efficiency information. 19. The wireless charging device according to any one of claims 1-5, 7-8, and 11-15, wherein the communication control circuit is further configured to wirelessly communicate with the device to be charged to determine a charging mode, the charging mode including a first wireless charging mode and a second wireless charging mode, wherein the maximum transmission power of the wireless transmitting circuit is greater than the maximum transmission power of the wireless transmitting circuit when the first wireless charging mode is used. 20. The wireless charging device as described in any one of claims 1-5, 7-8, and 11-15, wherein the wireless charging device is a wireless charging base. 21. A device to be charged, characterized in that the device to be charged comprises: Battery; A communication control circuit is used to communicate wirelessly with a wireless charging device during the wireless charging process of the battery. The communication control circuit includes one or more of the following modules for wireless communication with the wireless charging device: Bluetooth module, Wi-Fi module, high carrier frequency-based short-range wireless communication module, optical communication module, ultrasonic communication module, ultra-wideband communication module, and mobile communication module. A wireless receiving circuit is used to receive electromagnetic signals emitted by a wireless charging device and convert the electromagnetic signals into the output voltage and output current of the wireless receiving circuit; the communication control circuit of the wireless charging device adjusts the transmission power of the wireless charging device based on the feedback information of the device to be charged, so that the output voltage and/or output current of the wireless receiving circuit of the device to be charged matches the current charging stage of the battery; The communication control circuit of the wireless charging device communicates with the power supply device to negotiate the maximum input power of the power supply device. During the process of the wireless transmitting circuit wirelessly charging the device to be charged according to the maximum output power of the power supply device, the communication control circuit adjusts the amount of power extracted by the wireless transmitting circuit from the maximum output power to adjust the transmission power of the wireless transmitting circuit; or, during the wireless charging process, the communication control circuit of the wireless charging device communicates with the power supply device to adjust the output voltage and/or output current of the power supply device, thereby adjusting the transmission power of the wireless transmitting circuit. 22. The device to be charged as claimed in claim 21, wherein the high carrier frequency-based short-range wireless communication module includes an IC chip with an EHF antenna internally packaged. 23. The device to be charged as claimed in claim 22, wherein the high carrier frequency is 60 GHz. 24. The device to be charged as claimed in claim 21, wherein the optical communication module includes an infrared communication module. 25. The device to be charged as claimed in claim 21, wherein the communication control circuit is further configured to determine the wireless communication method used by the wireless communication based on the detected signal strength of each wireless communication method. 26. The device to be charged as claimed in any one of claims 21-25, characterized in that the device to be charged further comprises: A detection circuit is used to detect the voltage and/or current entering the battery during wireless charging. The communication control circuit is used to communicate wirelessly with the wireless charging device based on the voltage and/or current detected by the detection circuit, so that the wireless charging device adjusts the transmission power to adjust the voltage and/or current entering the battery. 27. The device to be charged as claimed in any one of claims 21-25, wherein the device to be charged comprises: The first charging channel is used to receive the output voltage and output current of the wireless receiving circuit, and to charge the battery based on the output voltage and output current of the first charging channel. 28. The device to be charged as claimed in claim 27, wherein the device to be charged further comprises: A step-down circuit is provided on the first charging channel; The step-down circuit is used to receive the output voltage of the wireless receiving circuit and step down the output voltage of the wireless receiving circuit to charge the battery. 29. The device to be charged as claimed in claim 28, wherein the step-down circuit is a Buck circuit or a charge pump. 30. The device to be charged as described in any one of claims 21-25 and 28-29, wherein the battery comprises N cells connected in series, where N is a positive integer greater than 1. 31. The device to be charged as described in any one of claims 21-25 and 28-29, characterized in that, The communication control circuit is used to send adjustment information to the wireless charging device via the wireless communication, the adjustment information being used to instruct the wireless charging device to adjust the transmission power of the wireless charging device's transmitting circuit. 32. The device to be charged as claimed in any one of claims 21-25 and 28-29, wherein the communication control circuit is further configured to send battery status information to the wireless charging device via the wireless communication, so that the wireless charging device adjusts the transmission power of the wireless transmitting circuit according to the battery status information, wherein the battery status information includes the current charge and/or current voltage of the battery in the device to be charged. 33. The device to be charged as described in any one of claims 21-25 and 28-29, characterized in that the communication information between the communication control circuit and the wireless charging device includes at least one of the following: The temperature information of the battery; Information indicating the peak or average value of the output voltage and/or output current of the wireless receiving circuit; Indication message indicating the activation of overvoltage or overcurrent protection; Power transfer efficiency information is used to indicate the power transfer efficiency between the wireless charging device and the wireless receiving circuit. 34. The device to be charged as claimed in claim 27, wherein the device to be charged further comprises: The second charging channel is provided with a conversion circuit. The conversion circuit is used to receive the output voltage and output current of the wireless receiving circuit, convert the output voltage and/or output current of the wireless receiving circuit, and charge the battery based on the converted voltage and/or current. The communication control circuit is also used to control the switching between the first charging channel and the second charging channel. 35. The device to be charged as claimed in claim 34, wherein the communication control circuit is further configured to perform handshake communication with the wireless charging device via the wireless communication, and control the first charging channel to operate when the handshake communication is successful, and control the second charging channel to operate when the handshake communication fails. 36. The device to be charged as claimed in claim 34 or 35, wherein the communication control circuit is further configured to control the switching between the first charging channel and the second charging channel according to the temperature of the battery. 37. A wireless charging method, characterized in that the wireless charging method is applied to a wireless charging device, the method comprising: During the wireless charging process of the device to be charged, wireless communication is conducted with the device to be charged, and the transmission power of the wireless charging device is adjusted based on the feedback information from the device to be charged, so that the output voltage and/or output current of the wireless receiving circuit inside the device to be charged matches the current charging stage of the battery; wherein, the wireless communication method includes any one or more of the following: Bluetooth communication, Wi-Fi communication, short-range wireless communication based on high carrier frequency, optical communication, ultrasonic communication, ultra-wideband communication, and mobile communication; The wireless transmitting circuit transmits electromagnetic signals based on the output voltage and output current of the power supply device. The system communicates with the power supply device to negotiate the maximum output power of the power supply device; during the wireless charging process where the wireless transmitting circuit wirelessly charges the device to be charged according to the maximum output power of the power supply device, the amount of power extracted by the wireless transmitting circuit from the maximum output power is adjusted to adjust the transmission power of the wireless transmitting circuit; or, During the wireless charging process, communication is established with the power supply device to adjust the output voltage and/or output current of the power supply device, thereby adjusting the transmission power of the wireless transmitting circuit. 38. A wireless charging method, characterized in that it is applied to a device to be charged, the method comprising: During the wireless charging process of the battery, wireless communication is conducted with the wireless charging device, wherein the wireless communication method includes any one or more of the following: Bluetooth communication, Wi-Fi communication, short-range wireless communication based on high carrier frequency, optical communication, ultrasonic communication, ultra-wideband communication and mobile communication. The wireless charging device receives electromagnetic signals emitted by the wireless charging device through a wireless receiving circuit and converts these signals into output voltage and output current. The wireless charging device adjusts its transmission power based on feedback information from the device being charged, ensuring that the output voltage and/or output current of the wireless receiving circuit matches the current charging stage of the battery. The wireless charging device also communicates with a power supply device to negotiate the maximum output power of the power supply device. During the wireless charging process, the wireless transmitting circuit adjusts the amount of power it extracts from the maximum output power to adjust its transmission power. Alternatively, during the wireless charging process, the wireless charging device communicates with the power supply device to adjust the output voltage and/or output current of the power supply device, thereby adjusting the transmission power of the wireless transmitting circuit.