Method for information transmission in wireless charging system, and related device

Abstract

Provided in the embodiments of the present application are a method for information transmission in a wireless charging system, and a related device. The method is applied to a first terminal in a wireless charging system, and the wireless charging system further comprises a second terminal, wherein the first terminal comprises a load, and functions of the second terminal comprise performing wireless charging on the load. The method comprises: when a first terminal is in a first operating mode, the first terminal sending a first value to a second terminal; and when the first terminal is in a second operating mode, the first terminal sending a second value to the second terminal, wherein the difference between the first operating mode and the second operating mode comprises: the durations of a load being equivalently short-circuited per unit time are different, and / or, the frequencies of the load being equivalently short-circuited per unit time are different, wherein the load being equivalently short-circuited means that the load is equivalently short-circuited in a wireless charging system. In the present solution, information sending from a first terminal to a second terminal is realized by means of equivalently short-circuiting a load, and it is not necessary to add an extra resistor, such that no waste of electric energy is caused, thereby facilitating an improvement in the effective utilization rate of electric energy.

Description

A method for information transmission in a wireless charging system and related equipment

[0001] This application claims priority to Chinese Patent Application No. 202510187165.2, filed on February 19, 2025, entitled "A Method for Information Transmission in a Wireless Charging System and Related Equipment", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of wireless charging, and more particularly to a method for information transmission in a wireless charging system and related equipment. Background Technology

[0003] Wireless charging technology provides users with a convenient charging experience. Currently, there is an energy coupling channel between the transmitter and receiver, which is used to wirelessly charge the load in the receiver from the transmitting end. During wireless charging, in order to achieve better charging performance, the transmitting and receiving ends often need to communicate to achieve coordinated control between them.

[0004] Communication between the transmitter and receiver can be achieved through in-band communication, which refers to communication via multiplexing the energy coupling channel between the transmitter and receiver. Specifically, the receiver can transmit information to the transmitter using resistive load modulation. For example, resistive load modulation involves adding a resistor to the receiver. When this resistor is connected in parallel with the load, the equivalent resistance of the entire wireless charging system circuit decreases, and the current in the transmitter circuit increases. When the resistor is not connected to the receiver circuit, the equivalent resistance of the entire wireless charging system circuit increases, and the current in the transmitter circuit decreases. The increase and decrease in current in the transmitter circuit represent different values, thereby enabling the receiver to transmit information to the transmitter.

[0005] However, resistive load modulation requires an additional resistor, and the resistor consumes power when connected in parallel with the load, resulting in wasted energy. Summary of the Invention

[0006] This application provides a method and related equipment for information transmission in a wireless charging system. Since this solution achieves information transmission from the first end to the second end by equivalently shorting the load, no additional resistor is needed, thus avoiding energy waste and improving the effective utilization rate of energy.

[0007] This application provides the following technical solution:

[0008] In a first aspect, this application provides a method for information transmission in a wireless charging system. The method is applied to a first end of the wireless charging system, which also includes a second end. The first end includes a load, and the function of the second end includes wirelessly charging the load. The method includes: when the first end is in a first operating mode, the first end sends a first value to the second end; when the first end is in a second operating mode, the first end sends a second value to the second end. The difference between the first operating mode and the second operating mode includes: the duration of the equivalent short circuit of the load per unit time is different, and / or the frequency of the equivalent short circuit of the load is different. The equivalent short circuit of the load refers to the load being equivalently short-circuited in the wireless charging system.

[0009] The phrase "the load is equivalently short-circuited in the wireless charging system" can also be understood as the load being disconnected from other components in the wireless charging system; or, from the perspective of the input side of the controllable rectifier circuit, the load is equivalently short-circuited in the wireless charging system.

[0010] It should be noted that since the load in the first end can be represented as the battery in the device (hereinafter referred to as the "first device" for ease of description), when the load is equivalently shorted in the wireless charging system, the load may be supplying power to the components in the first device, and the circuit formed by the load and the aforementioned components in the first device is a closed circuit; or, when the load is equivalently shorted in the wireless charging system, if the load is not supplying power to the components in the first device, the circuit of the load can be an open circuit, etc.

[0011] In this implementation, when the load at the first end is effectively short-circuited, the equivalent resistance of the entire wireless charging system decreases, causing a change in the current in the circuit at the second end. Therefore, the current in the circuit at the second end differs depending on whether the first end is in a first or second operating mode. This allows the first end to send two different values ​​to the second end, a first value and a second value, respectively, through these two different operating modes. Furthermore, since this solution achieves information transmission from the first end to the second end by effectively short-circuiting the load, no additional resistance is needed, thus avoiding energy waste and improving energy efficiency.

[0012] In one possible implementation, the first terminal further includes a controllable rectifier circuit. Specifically, at a first time, the controllable rectifier circuit converts alternating current into direct current required by the load; and at a second time, the controllable rectifier circuit effectively short-circuits the load, the first and second times being different. In other words, the controllable rectifier circuit in this application can include the aforementioned two different functions, with the controllable rectifier circuit performing different functions at the first and second times respectively.

[0013] Optionally, the first terminal can achieve two different functions of the controllable rectifier circuit by controlling the metal-oxide-semiconductor field-effect transistor (MOSFET) in the controllable rectifier circuit. In the following description, the metal-oxide-semiconductor field-effect transistor will be referred to as a MOS transistor.

[0014] In this implementation, the components in the controllable rectifier circuit are reused to achieve an equivalent short circuit of the load in the wireless charging system. This provides a simple circuit design approach to achieve an equivalent short circuit of the load in the wireless charging system and helps to avoid increasing costs.

[0015] In one possible implementation, when the drive signal of the controllable rectifier circuit is in a first state, the first terminal is in a first operating mode; when the drive signal of the controllable rectifier circuit is in a second state, the first terminal is in a second operating mode. Since the longer the controllable rectifier circuit is in rectification mode per unit time, the shorter the time it is used to effectively short-circuit the load per unit time, if the difference between the first and second operating modes includes a difference in the duration of the equivalent short-circuit of the load per unit time, then the difference between the first and second states includes a difference in the duration the rectifier circuit is in rectification mode per unit time. The rectification mode represents the controllable rectifier circuit's function of converting AC power into DC power required by the load. If the difference between the first and second operating modes includes a difference in the frequency of the equivalent short-circuit of the load, then the difference between the first and second states includes a difference in the frequency at which the controllable rectifier circuit is in rectification mode.

[0016] In this implementation, if the controllable rectifier circuit can perform two different functions at different times, namely converting AC power into DC power required by the load and effectively short-circuiting the load, the first terminal can switch between the first and second working modes by controlling the drive signal driving the controllable rectifier circuit to switch between the first and second modes. This enables the first terminal to send the first and second values ​​to the second terminal, providing a specific implementation scheme and improving the feasibility of this scheme.

[0017] In one possible implementation, the method further includes: the first terminal obtaining information from the second terminal based on the current and / or voltage in the circuit of the first terminal, the information from the second terminal including a third value and / or a fourth value.

[0018] Wherein, when the second end is in the third working mode, the value representing the source from the second end is the third value; when the second end is in the fourth working mode, the value representing the source from the second end is the fourth value; the second end includes a power supply, and the difference between the third working mode and the fourth working mode includes at least one of the following: the duration of power disconnection per unit time is different, the frequency of power disconnection is different, or the frequency of AC power supplied by the second end is different, and power disconnection means that the power supply is disconnected from other components in the wireless charging system other than the power supply.

[0019] For example, after obtaining the current (or voltage) in its own circuit, the first terminal can perform envelope detection based on the current (or voltage) to obtain an envelope (hereinafter referred to as the "second envelope" for ease of description); and then obtain second information from the first terminal based on the second envelope. Further, in one case, the second envelope reflects the switching between a third and a fourth operating mode. In another case, the second envelope reflects the third and fourth states of the drive signal of the inverter circuit.

[0020] In this implementation, information transmission from the second end to the first end is achieved by disconnecting the power supply from other components in the wireless charging system, or by adjusting the frequency of the AC power supplied by the second end. No additional resistor is required, thus avoiding energy waste during information transmission and improving energy efficiency. Furthermore, this application allows switching between the third and fourth operating modes simply by varying the duration and frequency of power disconnection within a unit of time, and / or the frequency of the AC power supplied by the second end. This enables the second end to send a third or fourth value to the first end. Compared to a system where the power supply is always disconnected when the second end sends a first value, or where the power supply remains connected during the same process, the current and voltage fluctuations caused by the switching between the third and fourth operating modes are relatively smaller in this application. This improves the stability and efficiency of the wireless charging process.

[0021] In one possible implementation, the frequency at which the load is equivalently short-circuited in the first and second operating modes includes the first frequency, and the frequency at which the power supply is disconnected from other components in the wireless charging system in the third and fourth operating modes includes the second frequency. The first and second frequencies are different. In this implementation, since the first and second frequencies are designed to be different, the second terminal can obtain the change in current at the second terminal under the second frequency through a filter, and thus obtain information from the first terminal; the first terminal can obtain the change in current or voltage at the first terminal under the first frequency through a filter, and thus obtain information from the second terminal. As described above, when the first and second frequencies are different, full-duplex communication between the first and second terminals can still be achieved, which not only improves the communication efficiency between the first and second terminals, but also facilitates adaptation to more application scenarios.

[0022] Secondly, this application provides a method for information transmission in a wireless charging system. The method is applied to a second end of the wireless charging system, which also includes a first end. The second end includes a power source, and the first end includes a load. The function of the second end includes wirelessly charging the load. The method includes: when the second end is in a third operating mode, the second end sends a third value to the first end; when the second end is in a fourth operating mode, the second end sends a fourth value to the first end. The difference between the third and fourth operating modes includes: different durations of power disconnection per unit time, and / or different frequencies of power disconnection. Power disconnection refers to the disconnection of the power source from other components in the wireless charging system besides the power source.

[0023] In one possible implementation, the second terminal further includes an inverter circuit. Specifically, at a third time, the inverter circuit converts the direct current (DC) from the power source into alternating current (AC); and at a fourth time, the inverter circuit disconnects the power source from other components in the wireless charging system, with the third and fourth times being different. In other words, the inverter circuit in this application can include the aforementioned two different functions, with the inverter circuit performing different functions at the third and fourth times respectively.

[0024] In this implementation, the second end uses components in the inverter circuit to disconnect the power supply from other components in the wireless charging system. This provides a simple circuit design approach to disconnect the power supply, which not only avoids increasing the complexity of the circuit but also helps to avoid increasing costs.

[0025] In one possible implementation, when the drive signal of the inverter circuit is in the third state, the third terminal is in the third operating mode; when the drive signal of the controllable inverter current is in the fourth state, the third terminal is in the fourth operating mode. Since the longer the inverter circuit is in inverter mode per unit time, the shorter the time the inverter circuit is used to disconnect the power supply from other components in the wireless charging system per unit time, if the difference between the third and fourth operating modes includes a different duration of power disconnection per unit time, then the difference between the third and fourth states includes a different duration of inverter circuit operation in inverter mode per unit time. Inverter mode represents the inverter circuit converting DC power from the power supply into AC power; when the inverter circuit is in inverter mode, the power supply circuit is closed. If the difference between the third and fourth operating modes includes a different frequency of power disconnection, then the difference between the third and fourth states includes a different frequency of inverter circuit operation in inverter mode.

[0026] In this implementation, if the inverter circuit can perform two different functions at different times, namely converting DC power from the power source into AC power and disconnecting the power source, the second terminal can switch between the third and fourth operating modes by controlling the drive signal of the inverter circuit to switch between the third and fourth modes. This enables the second terminal to send the third and fourth values ​​to the first terminal, providing a specific implementation scheme and improving the feasibility of this scheme.

[0027] In one possible implementation, the second terminal obtains information from the first terminal based on the current and / or voltage in its circuit. This information includes a first value and / or a second value. Specifically, when the first terminal is in a first operating mode, the first value represents the information from the first terminal; when the first terminal is in a second operating mode, the second value represents the information from the first terminal. The difference between the first and second operating modes includes: different durations of equivalent short-circuiting of the load per unit time, and / or different frequencies of equivalent short-circuiting of the load. Equivalent short-circuiting of the load refers to the load being equivalently short-circuited in the wireless charging system.

[0028] Optionally, after obtaining the current in the circuit of the second terminal, the second terminal can perform envelope detection based on the current in the circuit of the second terminal to obtain an envelope (hereinafter referred to as the "first envelope" for ease of description); and then obtain the first information from the first terminal based on the first envelope. In another case, the first envelope reflects the first and second forms of the drive signal of the controllable rectifier circuit; in other words, the first envelope corresponds to the first and second forms of the drive signal of the controllable rectifier circuit.

[0029] Thirdly, this application provides an apparatus, which is a first end in a wireless charging system. The wireless charging system also includes a second end, wherein the first end includes a load, and the function of the second end includes wirelessly charging the load; when the first end is in a first operating mode, the first end sends a first value to the second end; when the first end is in a second operating mode, the first end sends a second value to the second end; wherein the difference between the first operating mode and the second operating mode includes: the duration of the equivalent short circuit of the load per unit time is different, and / or the frequency of the equivalent short circuit of the load is different, and the equivalent short circuit of the load means that the load is equivalently short-circuited in the wireless charging system.

[0030] In the third aspect of this application, the apparatus is also used to perform the steps performed at the first end in the first aspect and in various possible implementations of the first aspect. The specific implementations of the steps in the third aspect, the meanings of the terms, and the beneficial effects are all described in the first aspect and will not be repeated here.

[0031] Fourthly, this application provides a device, which is the second end of a wireless charging system. The wireless charging system also includes a first end. The second end includes a power source, and the first end includes a load. The function of the second end includes wirelessly charging the load. When the second end is in a third operating mode, the second end sends a third value to the first end. When the second end is in a fourth operating mode, the second end sends a fourth value to the first end. The difference between the third operating mode and the fourth operating mode includes: the duration of power disconnection per unit time is different, and / or the frequency of power disconnection is different. Power disconnection means that the power source is disconnected from other components in the wireless charging system other than the power source.

[0032] In the fourth aspect of this application, the apparatus is also used to perform the steps performed at the second end in the second aspect and various possible implementations of the second aspect. The specific implementations of the steps in the fourth aspect, the meanings of the terms, and the beneficial effects are all described in the second aspect, and will not be repeated here.

[0033] Fifthly, embodiments of this application provide an apparatus including a processor and a memory, the processor being coupled to the memory, the memory being used to store a program; the processor being used to execute the program in the memory, causing the apparatus to perform the methods described in the first or second aspect above.

[0034] In a sixth aspect, embodiments of this application provide a system including a first end and a second end, wherein the first end executes the data processing method described in the first aspect, and the second end executes the method described in the second aspect.

[0035] In a seventh aspect, embodiments of this application provide a computer-readable storage medium storing a computer program that, when run on a computer, causes the computer to perform the methods described in the first or second aspect.

[0036] Eighthly, embodiments of this application provide a computer program product, which includes a program that, when run on a computer, causes the computer to perform the methods described in the first or second aspect.

[0037] Ninthly, this application provides a chip or chip system including at least one processor for supporting a method for implementing any possible implementation of either the first or second aspect described above.

[0038] In one possible design, the chip or chip system may further include a memory for storing necessary program instructions and data. The chip system may be composed of chips or may include chips and other discrete devices. Optionally, the chip system may also include interface circuitry that provides program instructions and / or data to the at least one processor.

[0039] The second to ninth aspects of this application correspond to the first aspect or multiple possible ways of the first aspect, and have corresponding beneficial effects. Attached Figure Description

[0040] Figure 1 is a schematic diagram of a wireless charging system provided in an embodiment of this application;

[0041] Figure 2 is a flowchart illustrating a method for information transmission in a wireless charging system provided in an embodiment of this application.

[0042] Figure 3 is a schematic diagram of a controllable rectifier circuit provided in an embodiment of this application;

[0043] Figure 4 is another schematic diagram of the controllable rectifier circuit provided in the embodiment of this application;

[0044] Figure 5 is another schematic diagram of the controllable rectifier circuit provided in the embodiment of this application;

[0045] Figure 6 is a schematic diagram of a drive signal for a controllable rectifier circuit provided in an embodiment of this application;

[0046] Figure 7 is another schematic diagram of the drive signal of the controllable rectifier circuit provided in the embodiment of this application;

[0047] Figure 8 is a schematic diagram of a first initial drive signal and a drive signal of a controllable rectifier circuit provided in an embodiment of this application;

[0048] Figure 9 is a schematic diagram of a first initial driving signal and a driving signal provided in an embodiment of this application;

[0049] Figure 10 is a schematic diagram of a first end sending information to a second end according to an embodiment of this application;

[0050] Figure 11 is a schematic diagram of a first envelope provided in an embodiment of this application;

[0051] Figure 12 is another schematic diagram of the first envelope provided in an embodiment of this application;

[0052] Figure 13 is another schematic diagram of the first envelope provided in an embodiment of this application;

[0053] Figure 14 is another flowchart illustrating the information transmission method in the wireless charging system provided in this application embodiment;

[0054] Figure 15 is a schematic diagram of an inverter circuit provided in an embodiment of this application;

[0055] Figure 16 is a schematic diagram of a second end sending second information to a first end according to an embodiment of this application;

[0056] Figure 17 is another schematic diagram of the information transmission method in the wireless charging system provided in the embodiments of this application;

[0057] Figure 18 is a schematic diagram of a device provided in an embodiment of this application. Detailed Implementation

[0058] The embodiments of this application will now be described with reference to the accompanying drawings. Obviously, the described embodiments are merely some, and not all, of the embodiments of this application. Those skilled in the art will recognize that, with the emergence of new application scenarios, the technical solutions provided by the embodiments of this application are also applicable to similar technical problems.

[0059] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such terms are interchangeable where appropriate; this is merely a way of distinguishing objects with the same attributes in the description of embodiments of this application. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion, so that a process, method, system, product, or apparatus that comprises a series of units is not necessarily limited to those units, but may include other units not explicitly listed or inherent to those processes, methods, products, or apparatuses.

[0060] In the embodiments of this application, "send" and "receive" indicate the direction of signal transmission. For example, "send information to node XX" can be understood as the destination of the information being node XX, which may include direct transmission via the air interface or indirect transmission by other units or modules via the air interface. "Receive information from node YY" can be understood as the source of the information being node YY, which may include direct reception from node YY via the air interface or indirect reception from node YY via other units or modules via the air interface. "Send" can also be understood as the "output" of the chip interface, and "receive" can also be understood as the "input" of the chip interface. In other words, sending and receiving can occur between nodes or within a node, for example, through a bus, trace, or interface between components, modules, chips, software modules, or hardware modules within a node. It is understood that information may undergo necessary processing, such as encoding and modulation, between the source and destination of the information transmission, but the destination can understand the valid information from the source. Similar expressions in this application can be understood in a similar way and will not be elaborated further.

[0061] In the embodiments of this application, "instruction" can include direct and indirect instructions, as well as explicit and implicit instructions. The information indicated by a certain piece of information (hereinafter referred to as instruction information) is called the information to be instructed. In specific implementation, there are many ways to indicate the information to be instructed, such as, but not limited to, directly indicating the information to be instructed, such as the information to be instructed itself or its index. It can also indirectly indicate the information to be instructed by indicating other information, where there is an association between the other information and the information to be instructed; or it can indicate only a part of the information to be instructed, while the other parts are known or pre-agreed upon. For example, the instruction can be implemented by using a pre-agreed (e.g., protocol predefined) arrangement of various information, thereby reducing the instruction overhead to a certain extent. This application does not limit the specific method of instruction. It is understood that for the sender of the instruction information, the instruction information can be used to indicate the information to be instructed; for the receiver of the instruction information, the instruction information can be used to determine the information to be instructed.

[0062] The method provided in this application can be applied to wireless charging scenarios. Before describing in detail the information transmission method in the wireless charging system provided in this application, the wireless charging system provided in this application will be introduced with reference to the accompanying drawings. Please refer to Figure 1, which is a schematic diagram of a wireless charging system provided in an embodiment of this application. It should be noted that Figure 1 is a schematic diagram obtained by drawing the wireless charging system using a two-port network drawing method. As shown in Figure 1, the wireless charging system may include a first end and a second end. The first end may include a load, and the function of the second end may include wirelessly charging the load in the first end. In other words, the first end can be understood as a receiving end of electrical energy, and the second end can be understood as a transmitting end of electrical energy.

[0063] For example, the first end can be integrated into various types of devices, and the load in the first end can be the battery in the aforementioned device. For example, the aforementioned various types of devices include, but are not limited to: mobile phones, laptops, wearable devices, lights, air conditioners, refrigerators, vacuum cleaners, robot vacuum cleaners, or vehicles, etc. The specific form of the aforementioned devices can be determined in combination with the actual application scenario.

[0064] For example, the first terminal may further include a controllable rectifier circuit, a first compensation topology, and a first coupling mechanism. The second terminal may include a power supply; for example, the second terminal may further include an inverter circuit, a second compensation topology, and a second coupling mechanism.

[0065] The power source at the second terminal can be a DC power source. The function of the inverter circuit can include converting DC power from the power source into AC power. A detailed description of the inverter circuit will follow later, so it will not be elaborated here.

[0066] The function of the second compensation topology includes reactive power compensation, also known as reactive power compensation. In more detail, using the second compensation topology for reactive power compensation can be understood as using it to reduce losses in the wireless charging system and improve the efficient utilization of electrical energy. For example, the second compensation topology can be a compensation circuit composed of capacitors connected in series or parallel, or it can be a compensation circuit composed of capacitors and inductors, etc. The specific circuit structure of the second compensation topology can be determined based on the actual application scenario.

[0067] The coupling mechanism in this application can also be referred to as a coupling structure or energy coupling structure, etc. The second coupling mechanism is wirelessly coupled to the first coupling mechanism to enable the transmission of electrical energy from the second end to the first end. For example, if the second coupling mechanism and the first coupling mechanism are coupled via a magnetic field, both the second and first coupling mechanisms may include coils; if the second coupling mechanism and the first coupling mechanism are coupled via an electric field, both the second and first coupling mechanisms may include capacitor plates. The specific structure of the second and first coupling mechanisms can be flexibly determined based on the actual application scenario.

[0068] The first compensation topology performs reactive power compensation. The function and circuit structure of the first compensation topology can be found in the above description of the second compensation topology, and will not be described further here.

[0069] The function of the controllable rectifier circuit is to convert AC power into DC power required by the load at the first terminal. A detailed description of the controllable rectifier circuit will be provided later, and will not be elaborated here.

[0070] For example, as shown in Figure 1, the process of wirelessly charging the load at the first end by the power supply at the second end may include: the DC power provided by the power supply at the second end can be converted into AC power after passing through an inverter circuit. After reactive power compensation by a second compensation topology, the power can be transmitted from the second end to the first end through a second coupling mechanism and a first coupling mechanism. After reactive power compensation by a first compensation topology, the AC power in the first end can be converted into DC power required by the load by a controllable rectifier circuit, and then the load can be charged by the DC power. It should be understood that Figure 1 is only for the convenience of understanding the wireless charging system in this application. The actual wireless charging system may include more or fewer components, which can be determined according to the actual application scenario.

[0071] Based on the above description, the detailed implementation flow of the information transmission method in the wireless charging system provided in this application is described below. Please refer to Figure 2, which is a schematic flowchart of an information transmission method in the wireless charging system provided in an embodiment of this application. The information transmission method in the wireless charging system provided in this embodiment of this application may include steps 201 and 202.

[0072] Step 201: When the first end is in the first working mode, the first end sends the first value to the second end.

[0073] Step 202: When the first end is in the second working mode, the first end sends a second value to the second end. The difference between the first working mode and the second working mode includes: the duration of the load being equivalently short-circuited per unit time is different, and / or the frequency of the load being equivalently short-circuited is different. The load being equivalently short-circuited means that the load is equivalently short-circuited in the wireless charging system.

[0074] The phrase "the load is equivalently short-circuited in the wireless charging system" can also be understood as the load being disconnected from other components in the wireless charging system; or, from the perspective of the input side of the controllable rectifier circuit, the load is equivalently short-circuited in the wireless charging system.

[0075] It should be noted that since the load in the first end can be represented as the battery in the device (hereinafter referred to as the "first device" for ease of description), when the load is equivalently shorted in the wireless charging system, the load may be supplying power to the components in the first device, and the circuit formed by the load and the aforementioned components in the first device is a closed circuit; or, when the load is equivalently shorted in the wireless charging system, if the load is not supplying power to the components in the first device, the circuit of the load can be an open circuit, etc.

[0076] For example, the different durations of the equivalent short-circuit of the load per unit time may include: the equivalent short-circuit duration of the load per unit time in the first operating mode is longer than the equivalent short-circuit duration of the load per unit time in the second operating mode; or, the different durations of the equivalent short-circuit of the load per unit time may include: the equivalent short-circuit duration of the load per unit time in the first operating mode is shorter than the equivalent short-circuit duration of the load per unit time in the second operating mode. For example, the equivalent short-circuit duration of the load per unit time in the first operating mode is one-quarter of the unit time; the equivalent short-circuit duration of the load per unit time in the first operating mode is one-fifth of the unit time; or, for example, the equivalent short-circuit duration of the load per unit time in the first operating mode is one-third of the unit time; the equivalent short-circuit duration of the load per unit time in the first operating mode is one-half of the unit time, etc. The equivalent short-circuit duration of the load per unit time can be determined in combination with the actual application scenario.

[0077] For example, the different frequencies of equivalent short-circuiting of the load may include: the number of times the load is equivalently short-circuited per unit time in the first operating mode is greater than the number of times the load is equivalently short-circuited per unit time in the second operating mode; or, the different frequencies of equivalent short-circuiting of the load may include: the number of times the load is equivalently short-circuited per unit time in the first operating mode is less than the number of times the load is equivalently short-circuited per unit time in the second operating mode. For example, the number of times the load is equivalently short-circuited per unit time in the first operating mode is 4 times, and the number of times the load is equivalently short-circuited per unit time in the second operating mode is 8 times; or, for another example, the number of times the load is equivalently short-circuited per unit time in the first operating mode is 6 times, and the number of times the load is equivalently short-circuited per unit time in the second operating mode is 0 times, etc. The frequency of equivalent short-circuiting of the load can be determined in combination with the actual application scenario.

[0078] For example, when the load is effectively short-circuited in the wireless charging system, the equivalent resistance of the entire wireless charging system decreases, resulting in a larger current. Conversely, when the controllable rectifier circuit is in rectification mode, the load is connected to the wireless charging system, causing the equivalent resistance to rise and the current to decrease. Therefore, for the two different operating modes of the first terminal (first operating mode and second operating mode), the current in the circuit of the second terminal is different. The second terminal can determine the information from the first terminal (hereinafter referred to as the first information for ease of description) based on the current in the circuit. The specific implementation of the second terminal obtaining the first information will be described later and will not be elaborated here.

[0079] For example, in one case, the first end can be used to achieve an equivalent short circuit of the load in the wireless charging system through a controllable rectifier circuit.

[0080] Optionally, the controllable rectifier circuit in this application may include the following functions: at a first time, the controllable rectifier circuit converts AC power into DC power required by the load; and at a second time, the controllable rectifier circuit effectively short-circuits the load in the wireless charging system, wherein the first time and the second time are different. In other words, the controllable rectifier circuit in this application may include the aforementioned two different functions, and the controllable rectifier circuit is used to implement different functions at the first time and the second time, respectively.

[0081] For example, the controllable rectifier circuit can be a full-bridge rectifier circuit, a half-bridge rectifier circuit, or other types of rectifier circuits. Optionally, the first terminal can achieve two different functions of the controllable rectifier circuit by controlling the metal-oxide-semiconductor field-effect transistor (MOSFET) in the controllable rectifier circuit. In the following description, the metal-oxide-semiconductor field-effect transistor will be simply referred to as a MOSFET. To further understand this solution, the controllable rectifier circuit will be described below with reference to Figures 3 to 5. Referring first to Figure 3, Figure 3 is a schematic diagram of a controllable rectifier circuit provided in an embodiment of this application. As shown in Figure 3, the controllable rectifier circuit includes four MOSFETs, namely MOSFET 1, MOSFET 2, MOSFET 3, and MOSFET 4. When the controllable rectifier circuit is used to convert AC power into DC power required by the load, it can alternately execute the following two different steps: First, drive MOSFET 1 and MOSFET 4 to conduct simultaneously, while MOSFET 2 and MOSFET 3 are not conducted. The current from the input side of the controllable rectifier circuit flows out to the input side of the controllable rectifier circuit after passing through MOSFET 1, the load, and MOSFET 4; Second, drive MOSFET 2 and MOSFET 3 to conduct simultaneously, while MOSFET 1 and MOSFET 4 are not conducted. The current from the input side of the controllable rectifier circuit flows out to the input side of the controllable rectifier circuit after passing through MOSFET 2, the load, and MOSFET 3, thereby realizing the conversion of AC power into DC power required by the load.

[0082] When a controllable rectifier circuit is used to effectively short-circuit a load in a wireless charging system, in one implementation, the first terminal can drive MOSFETs 1 and 2 to conduct simultaneously, while MOSFETs 3 and 4 are not conducted. Thus, the current from the input side of the controllable rectifier circuit flows through MOSFETs 1 and 2 and then back to the input side of the controllable rectifier circuit. From the input side of the controllable rectifier circuit, the load is effectively short-circuited in the wireless charging system. Alternatively, in another implementation, the first terminal can drive MOSFETs 3 and 4 to conduct simultaneously, while MOSFETs 1 and 2 are not conducted. Thus, the current from the input side of the controllable rectifier circuit flows through MOSFETs 3 and 4 and then back to the input side of the controllable rectifier circuit. From the input side of the controllable rectifier circuit, the load is effectively short-circuited in the wireless charging system. It should be understood that the example in Figure 3 is only for ease of understanding of this solution and is not intended to limit this solution.

[0083] Please refer to Figure 4, which is another schematic diagram of the controllable rectifier circuit provided in this embodiment. As shown in Figure 4, the controllable rectifier circuit includes two diodes and two MOSFETs. The two diodes are diode 1 and diode 2, and the two MOSFETs are MOSFET 1 and MOSFET 2. When the controllable rectifier circuit is used to convert AC power into DC power required by the load, it can alternately execute the following two different steps: First, drive MOSFET 2 to conduct while MOSFET 1 is not conducting. The current from the input side of the controllable rectifier circuit flows out to the input side of the controllable rectifier circuit after passing through diode 1, the load, and MOSFET 2; Second, drive MOSFET 1 to conduct while MOSFET 2 is not conducting. The current from the input side of the controllable rectifier circuit flows out to the input side of the controllable rectifier circuit after passing through diode 2, the load, and MOSFET 1, thereby realizing the conversion of AC power into DC power required by the load.

[0084] When the controllable rectifier circuit is used to effectively short-circuit the load in a wireless charging system, the first terminal can drive MOSFET 1 and MOSFET 2 to conduct simultaneously. Thus, the current from the input side of the controllable rectifier circuit flows through MOSFET 1 and MOSFET 2 and then back to the input side of the controllable rectifier circuit. Therefore, from the perspective of the input side of the controllable rectifier circuit, the load is effectively short-circuited in the wireless charging system. It should be understood that the example in Figure 4 is only for illustrative purposes and is not intended to limit the scope of this solution.

[0085] Please refer to Figure 5, which is another schematic diagram of the controllable rectifier circuit provided in this embodiment. As shown in Figure 5, the controllable rectifier circuit includes four diodes, namely diode 1, diode 2, diode 3, and diode 4. When the controllable rectifier circuit is used to convert AC power into DC power required by the load, MOSFETs 1 and 2 are not conducting. The current flow alternates between the following two scenarios: the current from the input side of the controllable rectifier circuit flows back to the input side of the controllable rectifier circuit after passing through diode 1, the load, and diode 4; the current from the input side of the controllable rectifier circuit flows back to the input side of the controllable rectifier circuit after passing through diode 2, the load, and diode 3, thereby converting AC power into DC power required by the load.

[0086] When the controllable rectifier circuit is used to effectively short-circuit the load in a wireless charging system, the first terminal can drive MOSFET 1 and MOSFET 2 to conduct simultaneously. Thus, the current from the input side of the controllable rectifier circuit flows through MOSFET 1 and MOSFET 2 and then back to the input side of the controllable rectifier circuit. Therefore, from the perspective of the input side of the controllable rectifier circuit, the load is effectively short-circuited in the wireless charging system. It should be understood that the example in Figure 5 is only for illustrative purposes and is not intended to limit the scope of this solution.

[0087] It should be noted that Figures 3 to 5 illustrate how, when the controllable rectifier circuit is a full-bridge rectifier circuit, it can be used to achieve the two different functions of converting AC power into DC power required by the load and effectively short-circuiting the load in the wireless charging system at different times. When the controllable rectifier circuit is a half-bridge rectifier circuit or other types of rectifier circuits, it can also achieve the two different functions of converting AC power into DC power required by the load and effectively short-circuiting the load in the wireless charging system at different times. In this application embodiment, we will not exhaustively list them all. The specific structure of the controllable rectifier circuit and which MOSFETs in the controllable rectifier circuit are controlled can be flexibly determined in combination with the actual application product. The examples in Figures 3 to 5 are to demonstrate that two different functions of the controllable rectifier circuit can be achieved by controlling the MOSFETs in the controllable rectifier circuit, and are not intended to limit this solution.

[0088] In this embodiment, reusing components in the controllable rectifier circuit to achieve an equivalent short circuit of the load in the wireless charging system provides a simple circuit design approach to achieve an equivalent short circuit of the load in the wireless charging system, and helps to avoid increasing costs.

[0089] For example, since the difference between the first operating mode and the second operating mode includes: the duration of the equivalent short circuit of the load per unit time is different, and / or the frequency of the equivalent short circuit of the load is different, when the controllable rectifier circuit includes the functions of "converting AC power into DC power required by the load" and "equivalently short-circuiting the load in the wireless charging system", the first terminal can control which operating mode the first terminal is in by controlling the drive signal of the controllable rectifier circuit, thereby realizing the transmission of each value in the first information to the second terminal.

[0090] For example, before executing step 201, after the first end determines the information to be sent to the second end (hereinafter referred to as "first information" for ease of description), the drive signal of the controllable rectifier circuit can also be determined based on the first information. The first information may include one or more values, including a first value and / or a second value. The first value and the second value are different values; for example, the first value is 1 and the second value is 0; or the first value is 0 and the second value is 1; or the first value is 1 and the second value is 2, etc., and can be determined according to the actual application scenario. For example, the first information may include 0101, or the first information may include 00111, or the first information may include 011010, etc. The specific content of the first information, the first value, and the second value can all be determined according to the actual application scenario.

[0091] For example, the operating frequency of the drive signal of the controllable rectifier circuit includes, but is not limited to, 6.78MHz, 13.56MHz or hundreds of kHz.

[0092] Optionally, the drive signal for the controllable rectifier circuit may include: a drive signal that drives the controllable rectifier circuit into rectification mode, and a drive signal that drives the controllable rectifier circuit to effectively short-circuit the load; the controllable rectifier circuit being in rectification mode means that the controllable rectifier circuit is used to convert AC power into DC power required by the load.

[0093] For example, in order to send a first value from the first terminal to the second terminal, the first terminal needs to be in a first operating mode, and the drive signal used to drive the controllable rectifier circuit can be in a first form. In order to send a second value from the first terminal to the second terminal, the first terminal needs to be in a second operating mode, and the drive signal used to drive the controllable rectifier circuit can be in a second form.

[0094] Since the longer the controllable rectifier circuit is in rectification mode per unit time, the shorter the time the controllable rectifier circuit is used to equivalently short-circuit the load per unit time, if the difference between the first working mode and the second working mode includes the different duration of the load being equivalently short-circuited per unit time, then the difference between the first form and the second form may include the different duration of the rectifier circuit being in rectification mode per unit time.

[0095] If the difference between the first operating mode and the second operating mode includes the different frequencies at which the load is equivalently short-circuited, then the difference between the first configuration and the second configuration includes the different frequencies at which the controllable rectifier circuit is in rectification mode.

[0096] To more intuitively understand the first and second forms of the drive signal for the controllable rectifier circuit, the following description is provided in conjunction with the accompanying drawings. Referring first to Figure 6, which is a schematic diagram of the drive signal for the controllable rectifier circuit provided in an embodiment of this application, the black portion in Figure 6 represents the drive signal when the controllable rectifier circuit is in rectification mode, and the white portion represents the drive signal when the controllable rectifier signal effectively short-circuits the load in the wireless charging system. As shown in Figure 6, when the first form of the drive signal is used, the controllable rectifier circuit remains in rectification mode for a given time. When the second form of the drive signal is used, the controllable rectifier circuit remains in rectification mode for half the time within a given time. The difference between the first and second forms in Figure 6 includes the different durations of the controllable rectifier circuit remaining in rectification mode within a given time. When the drive signal shown in Figure 6 is used to drive the controllable rectifier circuit, the first terminal switches between the first and second operating modes. The difference between the first and second operating modes includes the different durations of the load being effectively short-circuited within a given time. It should be understood that the example in Figure 6 is only for ease of understanding of this solution.

[0097] Please refer to Figure 7, which is another schematic diagram of the drive signal for the controllable rectifier circuit provided in the embodiments of this application. In Figure 7, the black portion represents the drive signal that drives the controllable rectifier circuit into rectification mode, and the white portion represents the drive signal that effectively short-circuits the load in the wireless charging system. As shown in Figure 7, when using the first type of drive signal, the controllable rectifier circuit is in rectification mode for half of the unit time; when using the second type of drive signal, the controllable rectifier circuit is in rectification mode for half of the unit time. The difference between the first and second types in Figure 7 includes the different durations of the controllable rectifier circuit in rectification mode per unit time. The difference between the first and second types in Figure 7 also includes the different frequencies at which the controllable rectifier circuit is in rectification mode. When the drive signal shown in Figure 7 is used to drive the controllable rectifier circuit, the first terminal switches between the first and second operating modes. The difference between the first and second operating modes includes the different frequencies at which the load is effectively short-circuited. It should be noted that the driving signals of the first and second forms can also be in other forms, as long as the driving signals of the first and second forms are different. The examples in Figures 6 and 7 are for the convenience of understanding this scheme. The specific forms of the driving signals of the first and second forms can be determined in combination with the actual application scenario.

[0098] For example, the first terminal determines the drive signal of the controllable rectifier circuit based on the first information, including: the first terminal can modulate the first initial drive signal based on the first information to obtain the drive signal of the controllable rectifier circuit. For example, when the first terminal sends a first value to the second terminal, the first terminal can use a first control signal of the drive signal to modulate the first initial drive signal to modulate the first initial drive signal into a first state. When the first terminal sends a second value to the second terminal, the first terminal can use a second control signal of the drive signal to modulate the first initial drive signal to modulate the first initial drive signal into the first state.

[0099] To more intuitively understand the modulation process of the driving signal, the following description is provided in conjunction with the accompanying drawings. Referring first to Figure 8, which is a schematic diagram of a first initial driving signal and a driving signal for a controllable rectifier circuit according to an embodiment of this application, Figure 8 uses an example where the density of the first control signal is 1, the density of the second control signal is 0.5, and the frequencies of both the first and second control signals are f0. It should be noted that the frequency of the control signal can be the same as the frequency of the driving signal of the controllable rectifier circuit, but is generally less than the frequency of the driving signal of the controllable rectifier circuit. The frequency of the control signal (e.g., the first or second control signal) can be at most equal to the frequency of the driving signal of the controllable rectifier circuit. As shown in Figure 8, the first information includes 11010010, with a first value of 1 and a second value of 0; the first initial driving signal continuously drives the controllable rectifier circuit into rectification mode. When the first terminal wants to send 1 to the second terminal, the first terminal uses the first control signal to modulate the first initial driving signal to obtain a first-mode driving signal for the controllable rectifier circuit. When the first terminal wants to send 0 to the second terminal, the first terminal uses the second control signal to modulate the first initial drive signal to obtain the second form of the drive signal for the controllable rectifier circuit. It should be understood that the example in Figure 8 is only for ease of understanding of this scheme.

[0100] Referring first to Figure 9, which is a schematic diagram of a first initial drive signal and a drive signal provided in an embodiment of this application. Figure 9 uses an example where the density of both the first and second control signals is 0.5, the frequency of the first control signal is f1, and the frequency of the second control signal is f2. It should be noted that the frequency of the control signal (e.g., the first or second control signal) can be the same as the frequency of the drive signal of the controllable rectifier circuit, but is generally less than the frequency of the drive signal of the controllable rectifier circuit. The frequency of the control signal can be at most equal to the frequency of the drive signal of the controllable rectifier circuit. As shown in Figure 9, the first information includes 11010010, with a first value of 1 and a second value of 0. The first initial drive signal continuously drives the controllable rectifier circuit in rectification mode. When the first terminal wants to send 1 to the second terminal, the first terminal uses the first control signal to modulate the first initial drive signal to obtain a first-mode drive signal for the controllable rectifier circuit. When the first terminal wants to send 0 to the second terminal, the first terminal uses the second control signal to modulate the first initial drive signal to obtain a second-mode drive signal for the controllable rectifier circuit. It should be understood that the examples in Figures 8 and 9 are merely examples to facilitate understanding of this scheme, and the specific form of the first information and the drive signal of the controllable rectifier circuit can be determined in combination with the actual application scenario.

[0101] In this embodiment, if the controllable rectifier circuit can perform two different functions at different times, namely converting AC power into DC power required by the load and effectively short-circuiting the load, the first terminal can switch between the first working mode and the second working mode by controlling the drive signal driving the controllable rectifier circuit to switch between the first and second modes. This enables the first terminal to send the first value and the second value to the second terminal, providing a specific implementation scheme and improving the feasibility of this scheme.

[0102] In another scenario, the controlled rectifier circuit may function solely to convert AC power into DC power required by the load. A MOSFET (hereinafter referred to as the "first MOSFET") may also be connected in parallel on the input side of the controlled rectifier circuit. When the first terminal drives the first MOSFET to connect, the controlled rectifier circuit and the load are effectively short-circuited in the wireless charging system. When the first MOSFET is not connected, the controlled rectifier circuit converts AC power into DC power required by the load, which can then charge the load.

[0103] For example, after determining the first information to be sent to the second end, the first end can determine the drive signal of the first MOSFET based on the first information. By controlling whether the first MOSFET is connected, the first end can switch between the first operating mode and the second operating mode, thereby enabling the first end to send different values ​​to the second end. Since the controllable rectifier circuit and the load are equivalently short-circuited in the wireless charging system, the controllable rectifier circuit will not be in rectification mode. Therefore, the conduction time of the first MOSFET is opposite to the conduction time of the controllable rectifier circuit. Thus, the form of the drive signal of the first MOSFET can be understood in conjunction with the above description of the drive signal of the controllable rectifier circuit. For example, referring to the two different forms of the drive signal of the controllable rectifier circuit in Figures 6 and 7, the white part in Figures 6 and 7 can be regarded as the time for driving the first MOSFET to conduct. In this embodiment, the drive signal of the first MOSFET will not be described in detail.

[0104] In this embodiment, when the load at the first end is effectively short-circuited, the equivalent resistance of the entire wireless charging system decreases, causing a change in the current in the circuit at the second end. Therefore, the current in the circuit at the second end differs depending on whether the first end is in a first or second operating mode. This allows the first end to send two different values ​​(a first value and a second value) to the second end through these two different operating modes. Furthermore, since this solution achieves information transmission from the first end to the second end by effectively short-circuiting the load, no additional resistance is needed, thus avoiding energy waste and improving energy efficiency.

[0105] Based on the above description, optionally, the method provided in this application further provides a specific implementation method for the second end to obtain the first information from the first end. For example, the second end obtains the first information from the first end based on the current and / or voltage in the circuit of the second end. The first information includes a first value and / or a second value. Wherein, when the first end is in a first operating mode, the first value represents the information from the first end; when the first end is in a second operating mode, the second value represents the information from the first end. The difference between the first operating mode and the second operating mode includes: different durations of equivalent short-circuiting of the load per unit time, and / or different frequencies of equivalent short-circuiting of the load. Equivalent short-circuiting of the load refers to the load being equivalently short-circuited in the wireless charging system.

[0106] In one implementation, the second terminal can detect the current in the circuit of the second terminal; for example, the detection location can be any location in the circuit of the second terminal. Alternatively, in another implementation, the second terminal can also detect the voltage in the circuit of the second terminal, and obtain the current in the circuit of the second terminal by detecting the voltage; for example, the detection location can be the voltage of a component (e.g., a capacitor) located on the output side of the inverter circuit in the circuit of the second terminal.

[0107] After obtaining the current in the circuit of the second terminal, the second terminal can perform envelope detection based on the current in the circuit of the second terminal to obtain the envelope (hereinafter referred to as the "first envelope" for ease of description); and then obtain the first information from the first terminal based on the first envelope.

[0108] Furthermore, in one scenario, the first envelope reflects the switching between the first and second operating modes. For a more intuitive understanding of this solution, please refer to Figure 10, which is a schematic diagram of a first end sending information to a second end according to an embodiment of this application. Figure 10 uses 0101 as an example of the first information sent from the first end to the second end. The first end sends the first information to the second end by controlling the drive signal of the controllable rectifier circuit. As shown in Figure 10, when the first end sends 0101 to the second end, the first value is 0 and the second value is 1, respectively. The drive signals of the controllable rectifier circuit are sequentially: first mode, second mode, first mode, and second mode, thus the operating modes of the first end are sequentially the first operating mode, the second operating mode, the first operating mode, and the second operating mode. Since the difference between the first mode and the second mode includes the different durations during which the controllable rectifier circuit is in rectification mode per unit time, the difference between the first operating mode and the second operating mode includes the different durations during which the load is equivalently short-circuited in the wireless charging system per unit time. Therefore, the current when the first end uses the first operating mode is greater than the current when the first end uses the second operating mode. Figure 10 uses the current at two locations, the input and output sides of the inverter circuit, as an example. Envelope detection is then performed on the current at each of the two locations to obtain the first envelope 1 and the first envelope 2 in Figure 10. Based on the first envelope 1, the information from the first terminal can be determined to be 0101; similarly, based on the first envelope 2, the information from the first terminal can also be determined to be 0101. It should be understood that the example in Figure 10 is only for the convenience of understanding this scheme and is not intended to limit this scheme.

[0109] In another case, the first envelope reflects the first and second forms of the drive signal of the controllable rectifier circuit; in other words, the first envelope corresponds to the first and second forms of the drive signal of the controllable rectifier circuit.

[0110] To understand this solution more intuitively, please refer to Figure 11, which is a schematic diagram of a first envelope provided in an embodiment of this application. Figure 11 uses 0101 as an example of the first information sent from the first end to the second end. The first end sends the first information to the second end by controlling the drive signal of the controllable rectifier circuit. As shown in Figure 11, when the first end sends 0101 to the second end, the first value is 0 and the second value is 1, respectively. The drive signals of the controllable rectifier circuit are sequentially: first mode, second mode, first mode, and second mode, thus the operating modes of the first end are sequentially: first operating mode, second operating mode, first operating mode, and second operating mode. Since the difference between the first mode and the second mode includes the different frequencies at which the controllable rectifier circuit is in rectification mode, the difference between the first operating mode and the second operating mode includes the different frequencies at which the load is equivalently short-circuited in the wireless charging system. Therefore, when the first end uses the first operating mode, the frequency of current change in the wireless charging system is greater than when the first end uses the second operating mode. As shown in Figure 11, when the drive signal of the controllable rectifier circuit drives the controllable rectifier circuit into rectification mode (i.e., the black part in the drive signal), the current in the circuit at the second terminal decreases; when the drive signal of the controllable rectifier circuit is used to effectively short-circuit the load in the wireless charging system (i.e., the white part in the drive signal), the current in the circuit at the second terminal increases. The first envelope in Figure 11 reflects the first and second forms of the drive signal of the controllable rectifier circuit. It should be understood that the example in Figure 11 is only for the convenience of understanding this scheme and is not intended to limit this scheme.

[0111] If the difference between the first and second operating modes includes the different frequencies at which the load is equivalently short-circuited in the wireless charging system, for example, when the first terminal uses the first operating mode, the frequency at which the load is equivalently short-circuited in the wireless charging system is frequency 1, and when the first terminal uses the second operating mode, the frequency at which the load is equivalently short-circuited in the wireless charging system is frequency 2, then the first frequency is one of frequency 1 and frequency 2. Optionally, if the values ​​in the first information only include the first value and the second value, the second terminal can also first filter the current in the circuit of the second terminal through a filter during the envelope detection process, and then obtain the envelope of the filtered current, where the first envelope represents the envelope of the filtered current. The second terminal obtains the first information from the first terminal based on the first envelope.

[0112] For example, the purpose of filtering the current in the circuit of the second terminal through the filter may include filtering out the changes in the current at the first frequency. In other words, the filtered current only includes the changes in the current at the first frequency.

[0113] Furthermore, since the values ​​in the first information only include the first value and the second value, taking frequency 1 as an example, the filtered current only includes the current with a frequency of frequency 1. Therefore, in the envelope of the filtered current, the positions of the currents with a frequency of frequency 1 represent the first value originating from the first end, and the remaining positions represent the second value originating from the first end. This achieves the acquisition of the first information from the first end based on the envelope of the filtered current.

[0114] Alternatively, taking frequency 2 as an example, since the filtered current only includes currents with a frequency of frequency 2, the positions of currents with a frequency of frequency 2 in the envelope of the filtered current represent the second value originating from the first end, while the other positions represent the first value originating from the first end. Thus, it is also possible to obtain the first information from the first end based on the envelope of the filtered current.

[0115] Furthermore, in one scenario, the first envelope reflects the current in the circuit of the second terminal under one of the first and second operating modes. For a more intuitive understanding of this solution, please refer to Figure 12, which is another schematic diagram of the first envelope provided in this embodiment. As shown in Figure 12, when the first terminal sends 0101 to the second terminal, here we take a first value of 0 and a second value of 1 as an example. The drive signals of the controllable rectifier circuit used by the first terminal are sequentially the first and second forms, thus the operating modes of the first terminal are sequentially the first and second operating modes. Since the difference between the first and second forms includes the different frequencies at which the load is equivalently short-circuited in the wireless charging system, the second terminal filters out the current situation brought by the second operating mode through a filter, leaving only the current situation under the first operating mode. After determining the position with a value of 0, the remaining positions are filled with 1, thus obtaining the information from the first terminal: 0101. It should be understood that the example in Figure 12 is only for the convenience of understanding this solution and is not intended to limit this solution.

[0116] In another scenario, the first envelope corresponds to one of the first and second forms of the drive signal of the controllable rectifier circuit. For a more intuitive understanding of this solution, please refer to Figure 13, which is another schematic diagram of the first envelope provided in an embodiment of this application. As shown in Figure 13, when the first end sends 0101 to the second end, let's take the first value as 0 and the second value as 1 as an example. The drive signal of the controllable rectifier circuit used by the first end is sequentially in the first and second forms, thus the operating modes of the first end are sequentially the first operating mode and the second operating mode. Since the difference between the first and second forms includes the different frequencies at which the load is equivalently short-circuited in the wireless charging system, the second end filters out the current situation brought by the first operating mode through a filter, leaving only the current situation in the second operating mode. After determining the position with a value of 1, the remaining positions are filled with 0, thus obtaining the information from the first end: 0101. It should be understood that the example in Figure 13 is only for the convenience of understanding this solution and is not intended to limit this solution.

[0117] The above description illustrates how the first end sends information to the second end. In the method provided in this application, the second end can also send information to the first end. Optionally, based on the above description, please refer to Figure 14. Figure 14 is another flowchart illustrating the information transmission method in the wireless charging system provided in this application embodiment. The information transmission method in the wireless charging system provided in this application embodiment may include steps 1401 and 1402.

[0118] Step 1401: When the second end is in the third working mode, the second end sends the third value to the first end.

[0119] Step 1402: When the second end is in the fourth working mode, the second end sends the fourth value to the first end. The difference between the third working mode and the fourth working mode includes at least one of the following: the duration of power disconnection per unit time is different, the frequency of power disconnection is different, and the frequency of AC power provided by the second end is different. Among them, power disconnection means that the power supply is disconnected from other components in the wireless charging system other than the power supply.

[0120] For example, different power outage durations per unit time can include: the power outage duration per unit time in the third operating mode is longer than that in the fourth operating mode; or, different power outage durations per unit time can include: the power outage duration per unit time in the third operating mode is shorter than that in the fourth operating mode. For example, the power outage duration in the third operating mode is one-quarter of the unit time, or the power outage duration in the third operating mode is 0; or, for another example, the power outage duration in the third operating mode is one-quarter of the unit time, or the power outage duration in the third operating mode is one-third of the unit time, etc. The specific power outage duration per unit time under the two different operating modes can be determined based on the actual application scenario.

[0121] For example, different power disconnection frequencies may include: the number of power disconnections per unit time in the third operating mode is greater than the number of power disconnections per unit time in the fourth operating mode; or, different power disconnection frequencies may include: the number of power disconnections per unit time in the third operating mode is less than the number of power disconnections per unit time in the fourth operating mode. For example, the number of power disconnections per unit time in the third operating mode is 4, and the number of power disconnections per unit time in the fourth operating mode is 2; or, for another example, the number of power disconnections per unit time in the third operating mode is 2, and the number of power disconnections per unit time in the fourth operating mode is 3, etc. The power disconnection frequency can be determined based on the actual application scenario.

[0122] For example, when the power source is disconnected from other components in the wireless charging system, both the voltage and current in the entire wireless charging system decrease; when the power source is connected to other components in the wireless charging system, both the current and voltage in the entire wireless charging system increase. Therefore, for the two different operating modes of the second terminal, namely the third and fourth operating modes, the voltage and current conditions in the circuit of the first terminal are different. Thus, the first terminal can determine the information from the second terminal (hereinafter referred to as the second information for ease of description) based on the voltage and / or current conditions in the circuit. The specific implementation method of the first terminal obtaining the second information will be introduced in the following description and will not be elaborated here.

[0123] For example, the different frequencies of the AC power supplied at the second terminal may include: the frequency of the AC power supplied at the second terminal in the third operating mode is greater than the frequency of the AC power supplied at the second terminal in the fourth operating mode; or, the different frequencies of the AC power supplied at the second terminal may include: the frequency of the AC power supplied at the second terminal in the third operating mode is less than the frequency of the AC power supplied at the second terminal in the fourth operating mode.

[0124] For example, when the difference between the third and fourth operating modes is due to different frequencies of the AC power supplied to the second terminal, the voltage conditions in the circuit of the first terminal will differ for these two different operating modes. For example, the voltage switching frequencies in the circuit of the first terminal may be different, and the current conditions in the circuit of the first terminal will also be different, for example, the current switching frequencies in the circuit of the first terminal may be different. Therefore, the first terminal can determine the second information from the second terminal based on the voltage and / or current conditions in the circuit. The specific implementation method for the first terminal to obtain the second information will be described later and will not be elaborated here.

[0125] Since this application achieves information transmission from the second end to the first end by disconnecting the power supply from other components in the wireless charging system, or by adjusting the frequency of the AC power supplied by the second end, no additional resistor is needed. Therefore, there is no extra energy waste when the second end transmits information to the first end, which is beneficial for improving the effective utilization of energy. Furthermore, since this application allows switching between the third and fourth operating modes simply by varying the duration of power disconnection per unit time, and / or the frequency of power disconnection, and / or the frequency of the AC power supplied by the second end, it enables the second end to transmit a third or fourth value to the first end. Compared to a scenario where the power supply is always disconnected when the second end transmits a first value, and the power supply remains connected during the same process, the solution provided in this application causes relatively smaller fluctuations in current and voltage at the first end when the second end switches between the third and fourth operating modes. This is beneficial for improving the stability and efficiency of the wireless charging process.

[0126] For example, the first terminal can be connected to other components in the wireless charging system via an inverter circuit, and the second terminal can also be connected to provide AC power of different frequencies via an inverter circuit. For example, the inverter circuit can be a full-bridge inverter circuit, a half-bridge inverter circuit, or other types of inverter circuits.

[0127] Optionally, the inverter circuit in this application may include the following functions: at a third time, the inverter circuit converts direct current from the power source into alternating current; and at a fourth time, the inverter circuit disconnects the power source from other components in the wireless charging system, with the third and fourth times being different. In other words, the inverter circuit in this application may include the aforementioned two different functions, with the inverter circuit performing different functions at the third and fourth times respectively.

[0128] For example, if the communication between the first and second ends is simplex, then the first, second, third, and fourth times can all be different. Simplex communication means that the time when the first end sends the first information to the second end does not overlap with the time when the second end sends the second information to the first end. Conversely, if the communication between the first and second ends is full-duplex, then the first, second, third, and fourth times can overlap. Full-duplex communication means that the time when the first end sends the first information to the second end overlaps with the time when the second end sends the second information to the first end.

[0129] For example, the second terminal can control the MOSFETs in the inverter circuit to achieve two different functions of the inverter circuit. For a more intuitive understanding of this solution, please refer to Figure 15, which is a schematic diagram of an inverter circuit provided in an embodiment of this application. The inverter circuit includes four MOSFETs: MOSFET 1, MOSFET 2, MOSFET 3, and MOSFET 4. When the inverter circuit is used to convert DC power from the power source into AC power, it can alternately execute the following two different steps: the first terminal drives MOSFET 1 and MOSFET 4 to conduct simultaneously, while MOSFET 2 and MOSFET 3 are not conducted. The current from the power source flows to the output side of the inverter circuit after passing through MOSFET 1, and the current from the output side of the inverter circuit flows to the power source after passing through MOSFET 4. The first terminal drives MOSFETs 2 and 3 to conduct simultaneously, while MOSFETs 1 and MOSFET 4 are not conducted. The current from the power supply flows out to the output side of the inverter circuit after passing through MOSFET 3, and the current from the output side of the inverter circuit flows out to the power supply after passing through MOSFET 2, so as to realize the conversion of DC power from the power supply into AC power.

[0130] When the inverter circuit is used to disconnect the power supply from other components in the wireless charging system, in one implementation, the first terminal can drive MOSFETs 1 and 2 to conduct simultaneously, while MOSFETs 3 and 4 are de-conducting. Alternatively, in another implementation, the first terminal can drive MOSFETs 3 and 4 to conduct simultaneously, while MOSFETs 1 and 2 are de-conducting.

[0131] It should be noted that the example in Figure 15 is only to demonstrate the feasibility of this solution. The inverter circuit can also have other structures. For example, the inverter circuit may include a half-bridge inverter circuit composed of two MOSFETs; or a three-phase inverter circuit comprising six MOSFETs. The driving method of the MOSFETs in the inverter circuit will change accordingly when the inverter circuit has other structures. When the inverter circuit is a half-bridge inverter circuit or a three-phase inverter circuit, the control of the inverter circuit switches between two functions: "converting DC power from the power source to AC power" and "disconnecting the power source from other components in the wireless charging system." When the inverter circuit is a half-bridge inverter circuit or a three-phase inverter circuit, the control method of the inverter circuit can be understood by referring to the above description of the driving method of the single-phase full-bridge inverter circuit shown in Figure 15. The cases where the inverter circuit has other structures will not be described here.

[0132] In this embodiment, the second terminal disconnects the power supply from other components in the wireless charging system by reusing components in the inverter circuit. This provides a simple circuit design approach to disconnect the power supply, which not only avoids increasing the complexity of the circuit but also helps to avoid increasing costs.

[0133] For example, since the difference between the third and fourth operating modes includes at least one of the following: different durations of power disconnection per unit time, different frequencies of power disconnection, or different frequencies of AC power supplied by the second terminal. When the inverter circuit includes both the functions of "converting DC power from the power source to AC power" and "disconnecting the power source from other components in the wireless charging system," the second terminal can control which operating mode it is in by controlling the drive signal of the inverter circuit, thereby enabling the transmission of each value in the second information to the first terminal.

[0134] For example, before executing step 1401, after the second terminal determines the second information to be sent to the first terminal, it can also determine the drive signal of the inverter circuit based on the second information. The second information may include one or more values, including a third value and / or a fourth value. The third and fourth values ​​are different values; for example, the third value is 1 and the fourth value is 0; or, for example, the third value is 0 and the fourth value is 1, etc. The specific content of the second information, the third value, and the fourth value can be determined according to the actual application scenario, and will not be elaborated further here.

[0135] Optionally, the drive signal for the inverter circuit may include: a drive signal that drives the inverter circuit into inverter mode, and a drive signal that drives the inverter circuit to disconnect the power supply from other components in the wireless charging system; the inverter circuit being in inverter mode means that the inverter circuit is used to convert DC power from the power supply into AC power.

[0136] For example, in order to send a third value from the second terminal to the first terminal, the second terminal needs to be in a third operating mode, and the drive signal used to drive the inverter circuit can be in a third state. In order to send a fourth value from the second terminal to the first terminal, the second terminal needs to be in a fourth operating mode, and the drive signal used to drive the inverter circuit can be in a fourth state.

[0137] Since the longer the inverter circuit is in inverter mode per unit time, the shorter the time it spends disconnecting the power supply from other components in the wireless charging system per unit time, if the difference between the third and fourth operating modes includes a different power disconnection time per unit time, then the difference between the third and fourth forms can include a different duration of inverter circuit operation in inverter mode per unit time. If the difference between the third and fourth operating modes includes a different frequency of power disconnection, then the difference between the third and fourth forms includes a different frequency of inverter circuit operation in inverter mode. If the difference between the third and fourth operating modes includes a different frequency of AC power supplied at the second terminal, then the difference between the third and fourth forms includes a different operating frequency of the inverter circuit in inverter mode. This allows the inverter circuit to convert the DC power supplied by the power supply into AC power of different frequencies.

[0138] Optionally, when the differences between the third and fourth operating modes include: different durations of power disconnection per unit time, and / or different frequencies of power disconnection, the meanings of the third and fourth modes can be found in the above description of the "first and second modes". The difference is that "the load is equivalently short-circuited in the wireless charging system" and "the load is equivalently short-circuited" in the above description are replaced with "the power is disconnected", and "the controllable rectifier circuit is in rectification mode" in the above description is replaced with "the inverter circuit is in inverter mode". This will not be elaborated further here.

[0139] For example, the second terminal determines the drive signal of the inverter circuit based on the second information, including: the second terminal can modulate the second initial drive signal based on the second information to obtain the drive signal of the inverter circuit, where the second initial drive signal represents continuously driving the inverter circuit in inverter mode. It should be understood that the method of obtaining the drive signal of the inverter circuit is similar to the method of obtaining the drive signal of the controllable rectifier circuit, for example, by modulating the second initial drive signal with two different control signals to obtain the third and fourth forms of the drive signal of the inverter circuit, which will not be described in detail here.

[0140] In this embodiment, if the inverter circuit can perform two different functions at different times, namely converting DC power from the power source into AC power and disconnecting the power source, the second terminal can switch between the third and fourth working modes by controlling the drive signal of the inverter circuit to switch between the third and fourth modes. This enables the second terminal to send the third and fourth values ​​to the first terminal, providing a specific implementation scheme and improving the feasibility of this scheme.

[0141] If the only difference between the third and fourth operating modes is the frequency of the AC power supplied at the second terminal, the inverter circuit can always be in inverter mode, regardless of whether the third or fourth type of drive signal is used. The difference lies in the operating frequency of the inverter circuit when it is in inverter mode.

[0142] Based on the above description, optionally, the method provided in this application further provides a specific implementation method for the first end to obtain second information from the second end. Exemplarily, the first end obtains the second information from the second end based on the current and / or voltage in the circuit of the first end. The second information from the second end includes a third value and / or a fourth value. Specifically, when the second end is in a third operating mode, the value from the second end is the third value; when the second end is in a fourth operating mode, the value from the second end is the fourth value. The second end includes a power supply. The difference between the third and fourth operating modes includes at least one of the following: different durations of power disconnection per unit time, different frequencies of power disconnection, or different frequencies of AC power supplied by the second end. Here, power disconnection refers to the disconnection of the power supply from other components in the wireless charging system besides the power supply.

[0143] Since the current and voltage in the circuit of the first terminal can change synchronously when the second terminal sends the second information to the first terminal, the first terminal can obtain the current in its circuit and, based on the current, obtain the second information from the second terminal. Alternatively, it can detect the voltage in the circuit of the first terminal and, based on the voltage, obtain the second information from the second terminal. The detection location for the current and / or voltage can be any location in the circuit of the first terminal.

[0144] After obtaining the current (or voltage) in its circuit, the first terminal can perform envelope detection based on the current (or voltage) to obtain an envelope (hereinafter referred to as the "second envelope" for ease of description); and then, based on the second envelope, obtain the second information from the first terminal. Further, in one case, the second envelope reflects the switching between the third and fourth operating modes. In another case, the second envelope reflects the third and fourth states of the inverter circuit's drive signal.

[0145] To understand this solution more intuitively, please refer to Figure 16, which is a schematic diagram of a second end sending second information to a first end according to an embodiment of this application. Figure 16 uses 0101 as an example of the second information sent from the second end to the first end. The second end sends the first information by controlling the drive signal of the inverter circuit. As shown in Figure 16, when the second end sends 0101 to the first end, the first value is 0 and the second value is 1, respectively. The drive signals of the inverter circuit are sequentially: third mode, fourth mode, third mode, and fourth mode, thus the operating modes of the second end are sequentially the third operating mode, fourth operating mode, third operating mode, and fourth operating mode. Since the difference between the third and fourth modes includes the different durations the inverter circuit is in inverter mode per unit time, the difference between the third and fourth operating modes includes the different durations the power is disconnected per unit time. Therefore, when the second end uses the third operating mode, the current and voltage in the wireless charging system are both lower than when the second end uses the fourth operating mode. The second envelope in Figure 16 reflects the switching between the third and fourth operating modes. When the second terminal uses the third operating mode, the current and voltage amplitudes in the circuit at the first terminal are smaller, representing a value of 0 from the first terminal. When the second terminal uses the fourth operating mode, the current and voltage amplitudes in the circuit at the first terminal are larger, representing a value of 1 from the first terminal. It should be understood that the example in Figure 16 is only for the convenience of understanding this scheme and is not intended to limit this scheme.

[0146] Optionally, if the difference between the third and fourth operating modes includes a different frequency of power disconnection—for example, when the second terminal uses the third operating mode, the power disconnection frequency is frequency 3, and when the second terminal uses the fourth operating mode, the power disconnection frequency is frequency 4—the second frequency is one of frequency 3 and frequency 4. Optionally, if the values ​​in the third information only include the third and fourth values, the first terminal can first filter the current in its circuit using a filter during envelope detection, and then obtain the envelope of the filtered current. The second envelope represents the envelope of the filtered current. Based on the second envelope, the first terminal obtains the third information from the second terminal.

[0147] For example, in one case, the second envelope reflects the current in the circuit at the first terminal under one of the third and fourth operating modes. In another case, the second envelope corresponds to one of the third and fourth forms of the drive signal of the controllable rectifier circuit.

[0148] For example, the purpose of filtering the current in the circuit of the first terminal through the filter may include filtering out the changes in the current at the second frequency. In other words, the filtered current only includes the changes in the current at the second frequency.

[0149] Since the values ​​in the third information only include the third and fourth values, taking frequency 3 as an example, the filtered current only includes the current with a frequency of frequency 3. Therefore, in the envelope of the filtered current, the positions of the current with a frequency of frequency 3 represent the third value originating from the second end, and the remaining positions represent the fourth value originating from the second end. This achieves the acquisition of the third information from the second end based on the envelope of the filtered current.

[0150] Alternatively, taking frequency 4 as an example, since the filtered current only includes currents with a frequency of 4, the positions of currents with a frequency of 4 in the envelope of the filtered current represent the fourth value from the second end, and the other positions represent the third value from the second end. Thus, it is also possible to obtain the third information from the second end based on the envelope of the filtered current.

[0151] For example, the frequency at which the load is equivalently short-circuited in the first and second operating modes includes the first frequency, and the frequency at which the power supply is disconnected from other components in the wireless charging system in the third and fourth operating modes includes the second frequency. The first and second frequencies are different, and full-duplex communication between the first and second ends can be achieved by using the aforementioned method.

[0152] For example, after obtaining the current in the circuit of the second terminal, the second terminal can perform envelope detection based on the current in the circuit of the second terminal to obtain a first envelope. For example, during the envelope detection process of the second terminal, the current in the circuit of the second terminal is first filtered by a filter. The purpose of filtering the current in the circuit of the second terminal can include filtering out the changes in the current at a first frequency. The second terminal obtains the envelope of the filtered current, and the first envelope represents the envelope of the filtered current. Then, based on the first envelope, the second terminal obtains the first information from the first terminal. The specific implementation of the above steps can be found in the above description and will not be repeated here.

[0153] After obtaining the current in its circuit, the first terminal can perform envelope detection to obtain a second envelope based on the current in its circuit. For example, during the envelope detection process, the current in the circuit is first filtered using a filter. The purpose of filtering the current in the circuit can include filtering out changes in the current at a second frequency. The first terminal obtains the envelope of the filtered current, and the second envelope represents the aforementioned envelope of the filtered current. Then, based on the second envelope, the first terminal obtains second information from the second terminal. The specific implementation of the aforementioned steps can be found in the above description and will not be repeated here.

[0154] Alternatively, in the first and second operating modes, the frequencies at which the load is equivalently short-circuited include frequency 1 and frequency 2, and in the third and fourth operating modes, the frequencies at which the power supply is disconnected from other components in the wireless charging system include frequency 3 and frequency 4. Frequency 1, frequency 2, frequency 3, and frequency 4 are all different. Using the aforementioned method, full-duplex communication between the first and second ends can be achieved.

[0155] For example, after obtaining the current in the circuit of the second terminal, the second terminal first filters the current in the circuit of the second terminal through a filter during the envelope detection process. The purpose of filtering the current in the circuit of the second terminal may include filtering out the changes in the current at frequency 1 and frequency 2. The second terminal obtains the envelope of the filtered current, where the first envelope represents the envelope of the filtered current. Then, based on the first envelope, the second terminal obtains the first information from the first terminal. The specific implementation of the above steps can be found in the above description and will not be repeated here.

[0156] After obtaining the current in the circuit of the first terminal, the first terminal first filters the current in the circuit of the first terminal during the envelope detection process. The purpose of filtering the current in the circuit of the first terminal can include filtering out the changes in the current at frequencies 3 and 4. The first terminal obtains the envelope of the filtered current, and the second envelope represents the aforementioned envelope of the filtered current. Then, based on the second envelope, the first terminal obtains the second information from the second terminal. The specific implementation of the above steps can be found in the description above, and will not be repeated here.

[0157] To better understand this solution, please refer to Figure 17, which is another schematic diagram of the information transmission method in the wireless charging system provided in this application embodiment. As shown in Figure 17, while the first end sends 0101 (i.e., an example of the first information) to the second end, the second end can also send 0101 (i.e., an example of the second information) to the first end. The first end can modulate based on the 0101 to be sent to obtain the drive signal of the controllable rectifier circuit. The second end can detect the current in the circuit of the second end on both the input and output sides of the inverter circuit. After obtaining the current in the circuit of the second end, envelope detection can be performed. The envelope detection process includes filtering out the changes in current at frequency 1 and frequency 2 through a filter, thereby obtaining the first envelope corresponding to the changes in current at frequency 1 and frequency 2. Based on the first envelope, the first information from the second end, including 0101, is obtained.

[0158] The second terminal can be modulated based on the desired 0101 to obtain the drive signal for the inverter circuit. The first terminal can detect the voltage in its circuit on both the input and output sides of the controllable rectifier circuit. After obtaining the voltage in the first terminal's circuit, envelope detection can be performed. This envelope detection process includes filtering out the current changes at frequencies 3 and 4 using a filter, thereby obtaining a second envelope corresponding to the current changes at frequencies 3 and 4. Based on the second envelope, the second information from the second terminal, including 0101, is obtained. It should be understood that the example in Figure 17 is only for illustrative purposes and is not intended to limit the scope of this solution.

[0159] In this embodiment, when the first frequency and the second frequency are designed to be different, the second terminal can obtain the change of the current at the second terminal under the second frequency through a filter, and thus obtain information from the first terminal; the first terminal can obtain the change of the current or voltage at the first terminal under the first frequency through a filter, and thus obtain information from the second terminal. As can be seen from the foregoing description, when the first frequency and the second frequency are different, full-duplex communication between the first terminal and the second terminal can also be realized, which not only helps to improve the communication efficiency between the first terminal and the second terminal, but also helps to adapt to more application scenarios.

[0160] Based on the embodiments corresponding to Figures 1 to 17, in order to better implement the above-described solutions of the embodiments of this application, related equipment for implementing the above-described solutions is also provided below. The embodiments of this application also provide a device, which is a first end in a wireless charging system. The wireless charging system further includes a second end, wherein the first end includes a load, and the function of the second end includes wirelessly charging the load; when the first end is in a first working mode, the first end sends a first value to the second end; when the first end is in a second working mode, the first end sends a second value to the second end; wherein the difference between the first working mode and the second working mode includes: the duration of the equivalent short circuit of the load per unit time is different, and / or, the frequency of the equivalent short circuit of the load is different, and the equivalent short circuit of the load means that the load is equivalently short-circuited in the wireless charging system.

[0161] Optionally, the first terminal further includes a controllable rectifier circuit, wherein, at a first time, the controllable rectifier circuit is used to convert AC power into DC power required by the load; and, at a second time, the controllable rectifier circuit is used to effectively short-circuit the load, the first time and the second time being different.

[0162] Optionally, when the drive signal of the controllable rectifier circuit is in the first state, the first terminal is in the first operating mode; when the drive signal of the controllable rectifier circuit is in the second state, the first terminal is in the second operating mode; wherein, if the difference between the first operating mode and the second operating mode includes the different duration of the equivalent short circuit of the load per unit time, then the difference between the first state and the second state includes the different duration of the rectifier circuit in the rectification mode per unit time, and the rectification mode represents the controllable rectifier circuit being used to convert AC power into DC power required by the load; if the difference between the first operating mode and the second operating mode includes the different frequency of the equivalent short circuit of the load, then the difference between the first state and the second state includes the different frequency of the controllable rectifier circuit in the rectification mode.

[0163] Optionally, the first terminal is also used to obtain information from the second terminal based on the current and / or voltage in the circuit of the first terminal, the information from the second terminal including a third value and / or a fourth value; wherein, when the second terminal is in a third operating mode, the value from the second terminal represents the third value, and when the second terminal is in a fourth operating mode, the value from the second terminal represents the fourth value; the second terminal includes a power supply, and the difference between the third operating mode and the fourth operating mode includes at least one of the following: the duration of power disconnection per unit time is different, the frequency of power disconnection is different, or the frequency of AC power supplied by the second terminal is different, and power disconnection means that the power supply is disconnected from other components in the wireless charging system other than the power supply.

[0164] Optionally, the frequency at which the load is equivalently short-circuited in the first and second operating modes includes the first frequency, and the frequency at which the power supply is disconnected from other components in the wireless charging system in the third and fourth operating modes includes the second frequency, wherein the first and second frequencies are different.

[0165] It should be noted that the information interaction and execution process between the modules / units in the above-mentioned device are based on the same concept as the various method embodiments corresponding to Figures 1 to 17 in this application. For details, please refer to the description in the method embodiments shown above in this application, which will not be repeated here.

[0166] This application embodiment also provides another device, which is the second end of a wireless charging system. The wireless charging system also includes a first end. The second end includes a power source, and the first end includes a load. The function of the second end includes wirelessly charging the load. When the second end is in a third working mode, the second end sends a third value to the first end. When the second end is in a fourth working mode, the second end sends a fourth value to the first end. The difference between the third working mode and the fourth working mode includes: the duration of power disconnection per unit time is different, and / or the frequency of power disconnection is different. Power disconnection means that the power source is disconnected from other components in the wireless charging system other than the power source.

[0167] Optionally, the second terminal also includes an inverter circuit, wherein, at a third time, the inverter circuit is used to convert DC power from the power source into AC power; and, at a fourth time, the inverter circuit is used to disconnect the power source from other components in the wireless charging system, the third time and the fourth time being different.

[0168] Optionally, when the drive signal of the inverter circuit is in the third state, the third terminal is in the third operating mode; when the drive signal of the controllable inverter current is in the fourth state, the third terminal is in the fourth operating mode. Wherein, if the difference between the third and fourth operating modes includes the different duration of power disconnection per unit time, then the difference between the third and fourth states includes the different duration of the inverter circuit in inverter mode per unit time. Inverter mode represents the inverter circuit converting DC power from the power supply into AC power. When the inverter circuit is in inverter mode, the power supply circuit is closed. If the difference between the third and fourth operating modes includes the different frequency of power disconnection, then the difference between the third and fourth states includes the different frequency of the inverter circuit being in inverter mode.

[0169] Optionally, the second terminal is further used to obtain information from the first terminal based on the current and / or voltage in the circuit of the second terminal, the information from the first terminal including a first value and / or a second value; wherein, when the first terminal is in a first operating mode, the value from the first terminal represents the information from the first terminal, and when the first terminal is in a second operating mode, the value from the first terminal represents the information from the first terminal; the difference between the first operating mode and the second operating mode includes: the duration of the equivalent short circuit of the load per unit time is different, and / or, the frequency of the equivalent short circuit of the load is different, the equivalent short circuit of the load means that the load is equivalently short-circuited in the wireless charging system.

[0170] It should be noted that the information interaction and execution process between the modules / units in the above-mentioned device are based on the same concept as the various method embodiments corresponding to Figures 1 to 17 in this application. For details, please refer to the description in the method embodiments shown above in this application, which will not be repeated here.

[0171] The following describes a device provided in an embodiment of this application. Please refer to Figure 18, which is a schematic diagram of the structure of a device provided in an embodiment of this application. Optionally, the device 1800 performs the functions of the first end or the second end in the corresponding method embodiments.

[0172] Device 1800 includes a memory 1802 and at least one processor 1801. Optionally, processor 1801 implements the methods in the above embodiments by reading program instructions stored in memory 1802; alternatively, processor 1801 may also implement the methods in the above embodiments by reading program instructions stored internally. Optionally, at least one processor 1801 is one or more CPUs, or a single-core CPU, or a multi-core CPU. For example, memory 1802 includes, but is not limited to, random access memory (RAM), read-only memory (ROM), flash memory, or optical memory. Memory 1802 stores program instructions of the operating system.

[0173] When the processor 1801 reads the program instructions stored in the memory 1802 to implement the method in the above embodiments, the memory 1802 stores the program instructions that implement the method provided in the above embodiments of this application. After the program instructions stored in the memory 1802 are read by the at least one processor 1801, the device 1800 executes the corresponding operations in the foregoing embodiments.

[0174] Optionally, the device 1800 also includes at least one accelerator 1803. Exemplarily, at least one accelerator 1803 may include at least one of the following: a hardware accelerator such as an embedded neural network processing unit (NPU), a graphics processing unit (GPU), a tensor processing unit (TPU), an application-specific integrated circuit (ASIC), or a field-programmable gate array (FPGA).

[0175] Optionally, the device 1800 also includes a network interface 1804, which can be a wired interface or a wireless interface.

[0176] It should be understood that network interface 1804 has the functions of receiving and sending data. The functions of "receiving data" and "sending data" can be integrated into the same transceiver interface, or the functions of "receiving data" and "sending data" can be implemented in different interfaces, without limitation here. In other words, network interface 1804 may include one or more interfaces for implementing the functions of "receiving data" and "sending data".

[0177] After the processor 1801 reads the program instructions from the memory 1802, other functions that the device 1800 can perform are described in the preceding method embodiments.

[0178] Optionally, the device 1800 also includes a bus 1805, through which the processor 1801 and memory 1802 are typically interconnected, but may also be interconnected in other ways.

[0179] The device 1800 provided in this application embodiment is used to execute the methods executed at the first or second end in the above-described method embodiments and achieve the corresponding beneficial effects. The specific implementation of the device 1800 shown in FIG18 can be referred to the descriptions in the foregoing method embodiments, and will not be repeated here.

[0180] This application also provides a system comprising a first end and a second end, wherein the first end executes the steps performed by the first end in the method described in the embodiments shown in Figures 1 to 17 above, and the second end executes the steps performed by the second end in the method described in the embodiments shown in Figures 1 to 17 above.

[0181] This application also provides a computer-readable storage medium storing a program that, when run on a computer, causes the computer to perform the steps executed by the first or second end of the method described in the embodiments shown in Figures 1 to 17.

[0182] This application also provides a computer program product, which includes a program that, when run on a computer, causes the computer to perform the steps executed by the first or second end of the method described in the embodiments shown in Figures 1 to 17.

[0183] This application also provides a circuit system including a processing circuit configured to perform the steps executed by the first or second terminal in the method described in the embodiments shown in Figures 1 to 17 above.

[0184] The first end, second end, or device provided in this application embodiment can specifically be a chip. The chip includes a processing unit, such as a processor. Optionally, the chip also includes a communication unit, such as an input / output interface, pins, or circuits. The processing unit can execute computer execution instructions stored in the storage unit to cause the chip to execute the methods described in the embodiments shown in Figures 1 to 17. Optionally, the storage unit is a storage unit within the chip, such as a register or cache. The storage unit can also be a storage unit located outside the chip within the wireless access device, such as a read-only memory (ROM) or other types of static storage devices capable of storing static information and instructions, such as random access memory (RAM).

[0185] The processor mentioned above can be a general-purpose central processing unit, microprocessor, GPU, NPU, TPU, ASIC, FPGA, or one or more integrated circuits used to control the execution of the program in the first aspect of the above method.

[0186] It should also be noted that the device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and 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 modules can be selected to achieve the purpose of this embodiment according to actual needs. In addition, in the device embodiment drawings provided in this application, the connection relationship between modules indicates that they have a communication connection, which can be implemented as one or more communication buses or signal lines.

[0187] Through the above description of the embodiments, those skilled in the art can clearly understand that this application can be implemented by means of software plus necessary general-purpose hardware, or it can be implemented by special-purpose hardware including application-specific integrated circuits, special-purpose CLUs, special-purpose memory, special-purpose components, etc. Generally, any function performed by a computer program can be easily implemented by corresponding hardware, and the specific hardware structure used to implement the same function can also be diverse, such as analog circuits, digital circuits, or special-purpose circuits. However, for this application, software program implementation is more often the preferred implementation method. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a readable storage medium, such as a computer floppy disk, USB flash drive, mobile hard disk, ROM, RAM, magnetic disk, or optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments of this application.

[0188] In the above embodiments, implementation can be achieved, in whole or in part, through software, hardware, firmware, or any combination thereof. When implemented in software, it can be implemented, in whole or in part, as a computer program product.

[0189] 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 may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center 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 may be any available medium that a computer can store or a data storage device such as a server or data center that integrates one or more available media. The available medium may be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., solid-state disk (SSD)).

Claims

1. A method for information transmission in a wireless charging system, the method comprising: The method is applied to a first end in a wireless charging system, the wireless charging system further comprising a second end, wherein the first end comprises a load, and a function of the second end comprises wirelessly charging the load, and the method comprises: When the first end is in a first working mode, the first end sends a first value to the second end; When the first end is in a second working mode, the first end sends a second value to the second end; Wherein, the difference between the first working mode and the second working mode comprises that the length of time in a unit time that the load is equivalently short-circuited is different, and / or the frequency of the load being equivalently short-circuited is different, and the load being equivalently short-circuited means that the load is equivalently short-circuited in the wireless charging system.

2. The method of claim 1, wherein, The first end further comprises a controllable rectifier circuit, wherein, At a first time, the controllable rectifier circuit is used to convert alternating current into direct current required by the load; and At a second time, the controllable rectifier circuit is used to equivalently short-circuit the load, and the first time and the second time are different.

3. The method of claim 2, wherein, When the driving signal of the controllable rectifier circuit is in a first form, the first end is in the first working mode; and when the driving signal of the controllable rectifier circuit is in a second form, the first end is in the second working mode; Wherein, if the difference between the first working mode and the second working mode comprises that the length of time in a unit time that the load is equivalently short-circuited is different, the difference between the first form and the second form comprises that the length of time in a unit time that the rectifier circuit is in a rectification mode is different, and the rectification mode represents that the controllable rectifier circuit is used to convert alternating current into direct current required by the load; If the difference between the first working mode and the second working mode comprises that the frequency of the load being equivalently short-circuited is different, the difference between the first form and the second form comprises that the frequency of the controllable rectifier circuit being in the rectification mode is different.

4. The method according to any one of claims 1 to 3, characterized in that, The method further comprises: The first end obtains information from the second end based on current and / or voltage in the circuit of the first end, and the information from the second end comprises a third value and / or a fourth value; Wherein, when the second end is in a third working mode, the third value from the second end is represented; and when the second end is in a fourth working mode, the fourth value from the second end is represented; The second end comprises a power supply, and the difference between the third working mode and the fourth working mode comprises at least one of the following: the length of time in a unit time that the power supply is disconnected is different, the frequency of the power supply being disconnected is different, or the frequency of alternating current provided by the second end is different, and the power supply being disconnected means that the power supply is disconnected from other elements in the wireless charging system.

5. The method of claim 4, wherein, The frequency of the load being equivalently short-circuited in the first working mode and the second working mode comprises a first frequency, the frequency of the power supply being disconnected from other elements in the wireless charging system in the third working mode and the fourth working mode comprises a second frequency, and the first frequency and the second frequency are different.

6. A method for information transmission in a wireless charging system, characterized in that, The method is applied to a second end in a wireless charging system, the wireless charging system further comprising a first end, wherein the second end comprises a power supply, the first end comprises a load, and a function of the second end comprises wireless charging of the load, and the method comprises: when the second end is in a third working mode, the second end sends a third value to the first end; when the second end is in a fourth working mode, the second end sends a fourth value to the first end; wherein the difference between the third working mode and the fourth working mode comprises different time lengths of the power supply being disconnected in a unit of time, and / or different frequencies of the power supply being disconnected, and the power supply being disconnected refers to the power supply being disconnected from other elements in the wireless charging system other than the power supply.

7. The method of claim 6, wherein, The second end further comprises an inverter circuit, wherein, at a third time, the inverter circuit is used to convert direct current from the power supply into alternating current; and at a fourth time, the inverter circuit is used to disconnect the power supply from other elements in the wireless charging system, and the third time and the fourth time are different.

8. The method of claim 7, wherein, when the driving signal of the inverter circuit is in a third form, the third end is in the third working mode; and when the driving signal of the controllable inverter current is in a fourth form, the third end is in the fourth working mode; wherein, if the difference between the third working mode and the fourth working mode comprises different time lengths of the power supply being disconnected in a unit of time, the difference between the third form and the fourth form comprises different time lengths of the inverter circuit being in an inverting mode in a unit of time, the inverting mode representing that the inverter circuit is used to convert direct current from the power supply into alternating current, and when the inverter circuit is in the inverting mode, the circuit of the power supply is in a pass-through state; if the difference between the third working mode and the fourth working mode comprises different frequencies of the power supply being disconnected, the difference between the third form and the fourth form comprises different frequencies of the inverter circuit being in the inverting mode.

9. The method according to any one of claims 6-8, characterized in that, The method further comprises: the second end obtains information from the first end based on current and / or voltage in the circuit of the second end, the information from the first end comprising a first value and / or a second value; wherein when the first end is in a first working mode, the first value is obtained from the first end, and when the first end is in a second working mode, the second value is obtained from the first end; the difference between the first working mode and the second working mode comprises different time lengths of the load being equivalently short-circuited in a unit of time, and / or different frequencies of the load being equivalently short-circuited, and the load being equivalently short-circuited refers to the load being equivalently short-circuited in the wireless charging system.

10. An apparatus, comprising: The device is a first end in a wireless charging system, the wireless charging system further comprising a second end, wherein the first end comprises a load, and a function of the second end comprises wireless charging of the first end; when the first end is in a first working mode, the first end sends a first value to the second end; when the first end is in the second operation mode, the first end sends a second value to the second end; wherein the difference between the first operation mode and the second operation mode comprises that the length of time in a unit time during which the load is equivalently short-circuited is different, and / or the frequency of the load being equivalently short-circuited is different, and the load being equivalently short-circuited means that the load is equivalently short-circuited in the wireless charging system.

11. The apparatus of claim 10, wherein, The first end further comprises a controllable rectifier circuit, wherein, at a first time, the controllable rectifier circuit is used to convert alternating current into direct current required by the load; and at a second time, the controllable rectifier circuit is used to equivalently short-circuit the load, and the first time and the second time are different.

12. The apparatus of claim 11, wherein, when the driving signal of the controllable rectifier circuit is in a first form, the first end is in the first operation mode; and when the driving signal of the controllable rectifier circuit is in a second form, the first end is in the second operation mode; wherein, if the difference between the first operation mode and the second operation mode comprises that the length of time in a unit time during which the load is equivalently short-circuited is different, the difference between the first form and the second form comprises that the length of time in a unit time during which the rectifier circuit is in a rectification mode is different, and the rectification mode means that the controllable rectifier circuit is used to convert alternating current into direct current required by the load; if the difference between the first operation mode and the second operation mode comprises that the frequency of the load being equivalently short-circuited is different, the difference between the first form and the second form comprises that the frequency of the controllable rectifier circuit being in the rectification mode is different.

13. The apparatus of any one of claims 10-12, wherein, the first end is further configured to obtain information from the second end based on the current and / or voltage in the circuit of the first end, and the information from the second end comprises a third value and / or a fourth value; wherein, when the second end is in a third operation mode, the third value is from the second end, and when the second end is in a fourth operation mode, the fourth value is from the second end; the second end comprises a power supply, and the difference between the third operation mode and the fourth operation mode comprises at least one of the following: the length of time in a unit time during which the power supply is disconnected is different, the frequency of the power supply being disconnected is different, or the frequency of alternating current provided by the second end is different, and the power supply being disconnected means that the power supply is disconnected from other elements in the wireless charging system.

14. The apparatus of claim 13, wherein, the frequency of the load being equivalently short-circuited in the first operation mode and the second operation mode comprises a first frequency, and the frequency of the power supply being disconnected from other elements in the wireless charging system in the third operation mode and the fourth operation mode comprises a second frequency, and the first frequency and the second frequency are different.

15. An apparatus, comprising: the apparatus is a second end in a wireless charging system, and the wireless charging system further comprises a first end, wherein, the second end comprises a power supply, the first end comprises a load, and the function of the second end comprises wirelessly charging the load; when the second end is in the third operation mode, the second end sends a third value to the first end; when the second end is in the fourth operation mode, the second end sends a fourth value to the first end; wherein the difference between the third operation mode and the fourth operation mode comprises: different time length of the power supply being disconnected in a unit time, and / or different frequency of the power supply being disconnected, the power supply being disconnected refers to the power supply being disconnected from other elements in the wireless charging system.

16. The apparatus of claim 15, wherein, The second end further comprises an inverter circuit, wherein, at a third time, the inverter circuit is configured to convert direct current from the power supply into alternating current; and at a fourth time, the inverter circuit is configured to disconnect the power supply from other elements in the wireless charging system, the third time and the fourth time being different.

17. The apparatus of claim 16, wherein, when the driving signal of the inverter circuit is in a third form, the third end is in the third operation mode; when the driving signal of the controllable inverter current is in a fourth form, the third end is in the fourth operation mode; wherein, if the difference between the third operation mode and the fourth operation mode comprises different time length of the power supply being disconnected in a unit time, the difference between the third form and the fourth form comprises different time length of the inverter circuit being in an inverting mode in a unit time, the inverting mode representing the inverter circuit being configured to convert direct current from the power supply into alternating current, when the inverter circuit is in the inverting mode, the circuit of the power supply is in a pass-through state; if the difference between the third operation mode and the fourth operation mode comprises different frequency of the power supply being disconnected, the difference between the third form and the fourth form comprises different frequency of the inverter circuit being in the inverting mode.

18. The apparatus of any one of claims 15-17, wherein, the second end is further configured to obtain information from the first end based on current and / or voltage in the circuit of the second end, the information from the first end comprising a first value and / or a second value; wherein when the first end is in a first operation mode, the first value is obtained from the first end, and when the first end is in a second operation mode, the second value is obtained from the first end; the difference between the first operation mode and the second operation mode comprises: different time length of the load being equivalently short-circuited in a unit time, and / or different frequency of the load being equivalently short-circuited, the load being equivalently short-circuited refers to the load being equivalently short-circuited in the wireless charging system.

19. An apparatus, comprising: comprising a processor and a memory, the processor being coupled to the memory, the memory is configured to store a program; the processor is configured to execute the program in the memory, so that the device executes the method of any one of claims 1-9.

20. A system, comprising: The system comprises a first end and a second end, the first end executes the method of any one of claims 1-5, and the second end executes the method of any one of claims 6-9.

21. A computer-readable storage medium, characterized in that, The computer readable storage medium stores a program, which, when executed on a computer, causes the computer to perform the method of any one of claims 1 to 9.

22. A computer program product, characterised in that, The computer program product comprises a program, which, when executed on a computer, causes the computer to perform the method of any one of claims 1 to 9.

23. A chip system, characterized by The chip system comprises a processor, which performs the method of any one of claims 1 to 9.

Images