Wireless charging system, method and electronic device

Abstract

The present invention provides a wireless charging system, a method, and an electronic device, and relates to the technical field of wireless charging. The wireless charging system includes a receiving module; a circuit modulation module is disposed in the rectifier of the receiving module; the DC modulation circuit of the circuit modulation module includes a DC modulation impedance and a DC modulation switch; and the controller of the receiving module is connected to the rectifier. When the DC modulation circuit satisfies a preset DC modulation condition, the output port of the receiving module is controlled by turning on the DC modulation switch to output a first output voltage, and wireless charging of a battery is performed under the first output voltage. The wireless charging system, method, and electronic device provided in the present invention can prevent the voltage output from the output port of the receiving module from fluctuating according to the DC voltage output from the rectifier when signal transmission is implemented in a load modulation manner on the DC side of the rectifier. Accordingly, the output power of the receiving module can be guaranteed, thereby improving the usage efficiency of the wireless charging system.

Description

Technology Field

[0001] The present invention relates to the field of wireless charging technology, and in particular to wireless charging systems, methods, and electronic devices. Background Technology

[0002] A wireless charging system generally includes a transmitting end and a receiving end, wherein the transmitting end refers to one side of the charger and the receiving end refers to one side being charged, and energy and communication signals are transmitted between the transmitting end and the receiving end through coupling, and the transmission of energy and communication signals may be bidirectional or unidirectional.

[0003] For convenience of understanding, FIG. 1 illustrates a structural block diagram of a wireless charging system, and for convenience of explanation, FIG. 1 illustrates only a transmitting module (10) and a receiving module (20), wherein the transmitting module (10) includes an inverter (101) of the transmitting end, a coil (T1) and a resonant capacitor (Cp) connected in series and installed at the output end of the inverter, and the receiving module (20) includes a rectifier (201), a coil (T2) and a resonant capacitor (Cs) connected in series and installed on the AC side of the rectifier (201).

[0004] Specifically, in FIG. 1, the inverter of the transmitting end converts the input DC power into AC power and drives the coil (T1), and energy is transferred between the coil (T1) and the coil (T2) through coupling, and the energy received by the receiving end module is converted into DC power by a rectifier and supplied to the load, that is, the battery connected to the receiving end module.

[0005] In FIG. 1, the coil (T1) and the coil (T2) are each connected in series with the resonant capacitor (Cp) and the resonant capacitor (Cs), respectively, to form an LC resonant cavity, but are not limited to the LC resonant method and may be other resonant methods such as LCL and LCCL.

[0006] Based on the wireless charging system illustrated in Fig. 1, in order to implement signal transmission, the receiving module generally implements signal transmission by changing the impedance, and this method of changing the impedance is also called load modulation. This load modulation method often causes fluctuations in the output voltage of the rectifier and affects the charging voltage supplied by the receiving module to the load, thereby causing fluctuations and reducing the output power of the receiving module, which in turn reduces the efficiency of the wireless charging system. The problem to be solved

[0007] In light of these points, the present invention aims to provide a wireless charging system, a method, and an electronic device for mitigating the above technical problem. means of solving the problem

[0008] In a first embodiment, an embodiment of the present invention provides a wireless charging system, wherein the wireless charging system comprises a receiving module; a circuit modulation module is disposed in a rectifier of the receiving module; the circuit modulation module comprises a DC modulation circuit corresponding to a DC modulation mode; the DC modulation circuit is installed on the DC side of the rectifier; the DC modulation circuit comprises a DC modulation impedance and a DC modulation switch connected in series with the DC modulation impedance, and the DC modulation switch is used to control the connection state between the DC modulation impedance and the rectifier; the rectifier is wirelessly connected to an AC power source to rectify the AC power source and output a DC voltage; The controller of the receiving module is connected to the rectifier, and when the DC modulation circuit satisfies a preset DC modulation condition, the output port of the receiving module is controlled by turning on the DC modulation switch to output a first output voltage, and wireless charging is performed on a battery connected to the receiving module under the first output voltage, wherein the first output voltage is smaller than the DC voltage output from the rectifier; and when the DC modulation switch is turned on, the DC modulation impedance is connected to the DC modulation circuit.

[0009] When combined with the first embodiment, the embodiment of the present invention provides a first possible embodiment of the first embodiment, and the wireless charging system further includes a transmitting module used to be connected to a DC power source, convert the DC power source into an AC power source, and couple the AC power source to the receiving module.

[0010] When combined with the first embodiment, the embodiment of the present invention provides a second possible embodiment of the first embodiment, wherein the circuit modulation module further comprises an AC modulation circuit corresponding to an AC modulation mode; the AC modulation circuit is installed on the AC side of the rectifier; the AC modulation circuit comprises an AC modulation impedance and an AC modulation switch connected in series with the AC modulation impedance, and the AC modulation switch is used to control the connection state between the AC modulation impedance and the rectifier.

[0011] When combined with the first possible embodiment of the first aspect, the embodiment of the present invention provides a third possible embodiment of the first aspect, wherein the circuit and the DC modulation circuit satisfy a preset DC load modulation condition, wherein wireless communication is established between the transmitting module and the receiving module, and the DC modulation switch is in a turned-off state, and the DC modulation switch in the turned-off state blocks the connection of the DC modulation impedance with the DC modulation circuit.

[0012] When combined with the first possible embodiment of the first aspect, the embodiment of the present invention provides a fourth possible embodiment of the first aspect, wherein the step of controlling the output port of the receiving module to output a first output voltage by turning on the DC modulation switch of the receiving module comprises: establishing wireless communication between the receiving module and the transmitting module, and, before the receiving module sends a communication signal to the transmitting module, controlling the receiving module to perform at least one drop detection test process until the difference value between the voltage output from the rectifier of the receiving module and the voltage output from the output port of the receiving module satisfies a preset threshold value, and determining the voltage output from the output port of the receiving module as the first output voltage; The method includes the step of controlling the receiving module to send a communication signal to the transmitting module, and when sending the communication signal, controlling the output port of the receiving module to output the first output voltage, wherein the drop detection test process comprises the step of controlling the DC modulation switch to switch to a turn-on state; recording the voltage output from the output port of the receiving module in the turn-on state, and then turning off the DC modulation switch; controlling the DC modulation switch to switch back to a turn-on state according to a preset time interval, and controlling the output port of the receiving module to output the recorded voltage; monitoring the difference value between the voltage output from the rectifier of the receiving module and the voltage output from the output port; stopping the drop detection test process if the difference value satisfies a preset threshold value; and if the difference value does not satisfy the preset threshold value, re-determining the voltage output from the output port until the difference value satisfies the preset threshold value.

[0013] When combined with the first embodiment, the embodiment of the present invention provides a fifth possible embodiment of the first embodiment, wherein the controller is further configured to acquire a pre-recorded output reference voltage—the output reference voltage being a voltage value output from the receiving module recorded when the DC modulation switch is first switched to the turn-on state—and further configured to determine the output reference voltage as the first output voltage and to control the receiving module to output the first output voltage.

[0014] When combined with the first embodiment, the embodiment of the present invention provides a sixth possible embodiment of the first embodiment, wherein the wireless charging system further includes a voltage regulator installed on the DC side of the rectifier, and the controller is further configured to output the first output voltage by controlling the output port through controlling the voltage regulator.

[0015] In a second embodiment, an embodiment of the present invention further provides a wireless charging method applied to the wireless charging system according to the first embodiment, the method comprising: a step of determining whether a DC modulation circuit corresponding to the receiving module satisfies a preset DC load modulation condition in response to a wireless communication connection being established between the receiving module and the transmitting module of the wireless charging system; a step of, if the preset DC load modulation condition is satisfied, controlling the output port of the receiving module by turning on the DC modulation switch to output a first output voltage - the first output voltage is smaller than the DC voltage output from the rectifier; and the DC modulation switch causes the DC modulation impedance to be connected to the DC modulation circuit when turned on - and a step of performing wireless charging for a battery connected to the receiving module under the first output voltage.

[0016] When combined with a second aspect, the embodiment of the present invention provides a first possible embodiment of the second aspect, wherein the circuit and the DC modulation circuit satisfy a preset DC load modulation condition, wherein wireless communication is established between the transmitting module and the receiving module, and the DC modulation switch is in a turned-off state; and the DC modulation switch in the turned-off state blocks the connection of the DC modulation impedance with the DC modulation circuit.

[0017] When combined with the second aspect, the embodiment of the present invention provides a second possible embodiment of the second aspect, wherein the step of controlling the output port of the receiving module to output a first output voltage by turning on the DC modulation switch comprises: controlling the receiving module to perform at least one drop detection test process until the difference value between the voltage output from the rectifier of the receiving module and the voltage output from the output port of the receiving module satisfies a preset threshold value before the receiving module sends a communication signal to the transmitting module, and determining the voltage output from the output port of the receiving module as the first output voltage; and controlling the receiving module to send a communication signal to the transmitting module, and when sending the communication signal, controlling the output port of the receiving module to output the first output voltage, wherein the step of performing the drop detection test process comprises: controlling the DC modulation switch to switch to a turned-on state; The method includes the steps of: recording the voltage output from the output port of the receiving module in the turned-on state and then turning off the DC modulation switch; controlling the DC modulation switch according to a preset time interval to switch it back to the turned-on state and controlling the output port of the receiving module to output the recorded voltage; monitoring the difference value between the voltage output from the rectifier of the receiving module and the voltage output from the output port; stopping the drop detection test process if the difference value satisfies a preset threshold value; and if the difference value does not satisfy the preset threshold value, determining the voltage output from the output port again until the difference value satisfies the preset threshold value.

[0018] When combined with the second aspect, the embodiment of the present invention provides a third possible embodiment of the second aspect, wherein the step of controlling the output port of the receiving module to output a first output voltage by turning on the DC modulation switch further comprises: the step of obtaining a pre-recorded output reference voltage—the output reference voltage being a voltage value output from the receiving module recorded when the DC modulation switch is first switched to the turned-on state—and the step of determining the output reference voltage as the first output voltage and controlling the output port of the receiving module to output the first output voltage.

[0019] When combined with the second aspect, the embodiment of the present invention provides a fourth possible embodiment of the second aspect, the method further comprises the step of switching the DC modulation switch to a turn-off state in response to the wireless communication connection between the receiving module and the transmitting module of the wireless charging system being cut off; or the step of switching the DC modulation switch to a turn-off state in response to the wireless charging of the battery connected to the receiving module being completed.

[0020] When combined with a third possible embodiment of the second aspect, the embodiment of the present invention provides a fifth possible embodiment of the second aspect, wherein the step of the receiving module sending a communication signal to the transmitting module includes the step of controlling the DC modulation switch according to a preset time period to switch between a turn-off state and a turn-on state in order to maintain wireless communication between the transmitting module and the receiving module.

[0021] When combined with the first possible embodiment of the second aspect, the embodiment of the present invention provides a sixth possible embodiment of the second aspect, the method further comprises the step of establishing wireless communication between the transmitting module and the receiving module, wherein if the DC modulation switch is in a turned-on state, the DC modulation circuit is determined not to satisfy a preset DC load modulation condition; or, if the load modulation mode of the receiving module is an AC modulation mode, the DC modulation circuit is determined not to satisfy a preset DC load modulation condition.

[0022] When combined with a sixth possible embodiment of the second aspect, the embodiment of the present invention provides a seventh possible embodiment of the second aspect, the method comprising: a step of determining whether the output voltage of the rectifier and the output voltage of the output port of the receiving module are in a decoupling state if the load modulation mode of the receiving module is an AC modulation mode; a step of, if in a decoupling state, controlling the AC modulation switch according to a preset time period to switch between a turn-off state and a turn-on state to maintain wireless communication between the transmitting module and the receiving module; and, if in a decoupling state, controlling the AC modulation switch according to a preset time period to switch between a turn-off state and a turn-on state after performing modulation with respect to the modulation direction of the output voltage of the rectifier, to maintain wireless communication between the transmitting module and the receiving module.

[0023] When combined with the seventh possible embodiment of the second aspect, the embodiment of the present invention provides an eighth possible embodiment of the second aspect, wherein the method further comprises the step of obtaining a pre-configured second output voltage when the output voltage of the rectifier and the output voltage of the output port of the receiving module are in a non-decoupling state, and controlling the output port of the receiving module to output the second output voltage to perform wireless charging for a battery connected to the receiving module, wherein the second output voltage is smaller than the output voltage of the rectifier, and the difference value between the second output voltage and the output voltage of the rectifier is greater than a preset threshold value.

[0024] In a third embodiment, an embodiment of the present invention further provides an electronic device, wherein a wireless charging system according to a first embodiment is disposed in the electronic device, and the battery of the electronic device is a rechargeable battery, and the battery is connected to an output port of a receiving module of the wireless charging system. Effects of the invention

[0025] Embodiments of the present invention provide the following beneficial effects.

[0026] According to the wireless charging system, method, and electronic device provided by an embodiment of the present invention, a circuit modulation module is disposed in the rectifier of the receiving module of the wireless charging system, and the circuit modulation module includes a DC modulation circuit corresponding to a DC modulation mode. When the DC modulation circuit satisfies a preset DC modulation condition, the output port of the receiving module can be controlled by turning on a DC modulation switch to output a first output voltage. Accordingly, wireless charging is performed on a battery connected to the receiving module under the first output voltage. Furthermore, the first output voltage is smaller than the DC voltage output from the rectifier. Thus, when signal transmission is implemented in a load modulation manner on the DC side of the rectifier, it is possible to prevent the voltage output from the output port of the receiving module from fluctuating according to the DC voltage output from the rectifier, thereby ensuring the output power of the receiving module and improving the usage efficiency of the wireless charging system.

[0027] Other features and advantages of the present invention will be described in the subsequent specification, and will be partially apparent from the specification or understood by implementing the invention. Objects and other advantages of the present invention are implemented and obtained in structures specifically shown in the specification, claims, and drawings.

[0028] In order to make the aforementioned objectives, features, and advantages of the present invention clearer and easier to understand, preferred embodiments are presented below and described in detail with reference to the accompanying drawings. Brief explanation of the drawing

[0029] To more clearly explain the specific embodiments of the present invention or the technical methods of the prior art, the drawings necessary for use in describing the specific embodiments or prior art are briefly introduced as follows. It is evident that the drawings described below represent some embodiments of the present invention, and those skilled in the art may obtain other drawings based on these drawings without creative labor. Figure 1 is a structural block diagram of a wireless charging system. FIG. 2 is a structural block diagram of a wireless charging system provided in an embodiment of the present invention. FIG. 3 is a structural block diagram of another wireless charging system provided in an embodiment of the present invention. FIG. 4 is a schematic diagram of a voltage waveform under load modulation provided in an embodiment of the present invention. FIG. 5 is a schematic diagram of an AC modulation scheme provided in an embodiment of the present invention. FIG. 6 is a schematic diagram of a voltage waveform under an AC modulation scheme provided in an embodiment of the present invention. FIG. 7 is a schematic diagram of a DC modulation scheme provided in an embodiment of the present invention. FIG. 8 is a schematic diagram of the voltage waveform of a drop detection test provided in an embodiment of the present invention. FIG. 9 is a flowchart of a wireless charging method provided in an embodiment of the present invention. Specific details for implementing the invention

[0030] To clarify the purpose, technical solution, and advantages of the embodiments of the present invention, a clear and complete description of the technical solution of the present invention is provided below together with the drawings, and it is evident that the described embodiments are only a part of the embodiments of the present invention and not the whole. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort fall within the scope of protection of the present invention.

[0031] With the rapid development of wireless charging technology, an increasing number of smart devices or smart terminals (e.g., smartphones, earphones, beauty devices, and even small home appliances) are adopting wireless charging technology, and the wireless charging process can be described by referring to the structural block diagram of the wireless charging system shown in Fig. 1. Additionally, during the wireless charging process, the transmitting module and the receiving module of the wireless charging system apply a load modulation method to change the impedance of the receiving module, thereby enabling the transmission of a signal.

[0032] However, during the load modulation process, it is prone to occur where the output voltage of the receiver module's output port fluctuates in tandem with the rectifier's output voltage; that is, a "non-decoupling" phenomenon occurs between the output voltage of the receiver module's output port and the rectifier's output voltage. Under this non-decoupling phenomenon, load modulation can cause the following problems:

[0033] (1) During the modulation process, there is a fluctuation in the output voltage of the output port of the receiving module, that is, the total output power of the receiving module may fluctuate. This can affect the quality of the load modulation. For example, while the load modulation itself increases the power output from the rectifier, the fluctuation in the load can decrease the output power of the receiving module, so the depth of the load modulation is weakened as the two cancel each other out.

[0034] (2) Noise from the load connected to the output port of the receiving module can be more easily introduced into the modulated signal due to non-decoupling, and consequently, it affects communication between the transmitting module and the receiving module.

[0035] Based on this, the wireless charging system, method, and electronic device provided in the embodiment of the present invention can effectively solve the aforementioned non-decoupling problem and, accordingly, improve the usage efficiency of the wireless charging system.

[0036] For the convenience of understanding the present embodiment, the wireless charging system disclosed in the embodiment of the present invention will first be introduced in detail.

[0037] In one possible embodiment, an embodiment of the present invention provides a wireless charging system, the wireless charging system comprising a receiving module; wherein a circuit modulation module is disposed in a rectifier of the receiving module; the circuit modulation module comprises a DC modulation circuit corresponding to a DC modulation mode; and the DC modulation circuit is installed on the DC side of the rectifier.

[0038] Furthermore, the DC modulation circuit includes a DC modulation impedance and a DC modulation switch connected in series with the DC modulation impedance, and the DC modulation switch is used to control the connection state between the DC modulation impedance and the rectifier.

[0039] For ease of understanding, FIG. 2 illustrates a structural block diagram of a wireless charging system, and for ease of explanation, FIG. 2 illustrates only the rectifier (201), coil (T2), resonant capacitor (Cs), and DC modulation impedance (Z1) and DC modulation switch (S1) included in the DC modulation circuit of the receiving module, wherein the DC modulation impedance (Z1) and DC modulation switch (S1) are connected in series and installed on the DC side of the rectifier (201).

[0040] Specifically, when implemented, the rectifier is connected to an AC power source wirelessly to rectify the AC power and output a DC voltage; for example, it obtains AC power from a transmitting module via a coil coupling method, rectifies it, and outputs it. Accordingly, the wireless charging system of an embodiment of the present invention further includes a transmitting module connected to a DC power source, and the transmitting module includes an inverter capable of converting DC power into AC power and coupling the AC power to a receiving module.

[0041] In addition, in an embodiment of the present invention, a controller of a receiving module (not shown in FIG. 2) is connected to a rectifier, and when the DC modulation circuit satisfies a preset DC modulation condition, the output port of the receiving module is controlled by turning on the DC modulation switch to output a first output voltage, and wireless charging is performed on a battery connected to the receiving module under the first output voltage.

[0042] Here, the rectifier of the receiving module may use a PRx rectifier, and the inverter of the transmitting module may use a PTx inverter; the specific models and parameters of the specific rectifier and inverter may be set according to the actual usage situation, and the embodiments of the present invention are not limited thereto.

[0043] Furthermore, the battery connected to the receiving module corresponds to the load connected to the receiving module.

[0044] In addition, the first output voltage of the embodiment of the present invention is smaller than the DC voltage output from the rectifier; and the DC modulation switch in the turn-on state causes the DC modulation impedance to be connected to the DC modulation circuit. In addition, when the first output voltage is output from the output port of the receiving module, the controller of the receiving module controls the DC modulation switch according to a preset time period to switch between the turn-off state and the turn-on state, thereby changing the impedance of the DC side of the rectifier to maintain wireless communication between the transmitting module and the receiving module, that is, signal transmission during the wireless charging process is implemented through a method of changing the impedance.

[0045] In actual use, the structural block diagram of the wireless charging system shown in FIG. 2 is such that the impedance change of the receiving module occurs on the DC side of the rectifier, for example, in FIG. 2, the DC modulation impedance (Z1) is switched in and out by controlling the DC modulation switch (S1), and this method can also be called a DC modulation method; the impedance change may also occur on the AC side of the rectifier, that is, it may be an AC modulation method, or a combination of the DC side and the AC side may be adopted.

[0046] Specifically, for ease of understanding, Figure 3 further illustrates a structural block diagram of another wireless charging system based on Figure 2, and in addition to the DC modulation circuit shown in Figure 2, the circuit modulation module provided in the embodiment of the present invention further includes an AC modulation circuit corresponding to an AC modulation mode; said AC modulation circuit is installed on the AC side of the rectifier (201); as shown in Figure 3, the AC modulation circuit includes an AC modulation impedance (Z2) and an AC modulation switch (S2) connected in series to the AC modulation impedance (Z2), said AC modulation switch (S2) is used to control the connection state between the AC modulation impedance (Z2) and the rectifier (201), that is, said AC modulation switch (S2) is used to switch the AC modulation impedance in and out.

[0047] Generally, regardless of whether the above DC modulation method or AC modulation method is used, it can result in a waveform of the output voltage of the rectifier. Specifically, FIG. 4 further illustrates a schematic diagram of a voltage waveform under load modulation, where the horizontal coordinate t represents time (e.g., the charging time of a wireless charging system), the vertical coordinate V represents voltage, Vrect represents the output voltage of the rectifier, and Vout represents the output voltage of the output port of the receiving module, i.e., the voltage used to charge the load. Specifically, FIG. 3 further illustrates the specific output positions of the output voltage Vrect of the rectifier and the output voltage Vout of the output port of the receiving module, where Vrect is generally higher than or equal to Vout.

[0048] Furthermore, in FIG. 4, the solid line represents Vrect and the dotted line represents Vout. Generally, the voltage difference between Vrect and Vout is controlled to be relatively small, but as shown in FIG. 4, if an appropriate control method is not adopted, Vout may wave together with Vrect during the load modulation process. In this case, where they wave together, there is "non-decoupling" between Vrect and Vout. In an embodiment of the present invention, when the DC modulation circuit satisfies a preset DC modulation condition, the output port of the receiving module is controlled by turning on the DC modulation switch to output a first output voltage, and wireless charging can be performed on the battery connected to the receiving module under the first output voltage. Furthermore, since the first output voltage is smaller than the DC voltage output from the rectifier, when signal transmission is implemented in a load modulation manner on the DC side of the rectifier, it is possible to prevent the voltage output from the output port of the receiving module from wavering according to the DC voltage output from the rectifier, thereby ensuring the output power of the receiving module and improving the usage efficiency of the wireless charging system.

[0049] In actual use, the wireless charging system further includes a voltage regulator installed on the DC side of the rectifier, wherein FIG. 3 additionally illustrates a voltage regulator (301); the controller of the receiving module is further configured to output a first output voltage by controlling the output port through controlling the voltage regulator (301), and generally, the voltage regulator is installed between the DC side of the rectifier and the output port of the receiving module to regulate the output voltage of the output port by controlling the voltage regulator. That is, in FIG. 3, the output voltage Vrect of the rectifier is regulated by the voltage regulator and then outputs Vout, i.e., the output voltage of the output port is obtained.

[0050] Generally, the output voltage Vout of the output port is smaller than Vrect, and the voltage difference between Vrect and Vout is controlled to be relatively small. A characteristic of this is that when the voltage regulator uses a Low Drop Out regulator (LDO) voltage stabilizer, the losses of the voltage regulator can be reduced. However, if the DC modulation circuit in the embodiment of the present invention does not adopt a control method that controls the output port of the receiving module to output a first output voltage by turning on the DC modulation switch when the DC modulation condition is satisfied, a case may occur where Vout fluctuates together with Vrect during the load modulation process.

[0051] Furthermore, regardless of whether a DC modulation method or an AC modulation method is adopted, cases may occur where Vout waves together with Vrect, meaning that a non-decoupling state may occur.

[0052] For example, FIG. 5 illustrates a schematic diagram of an AC modulation method. For convenience of explanation, FIG. 5 only shows an AC modulation switch (S2), an AC modulation impedance (Z2), a rectifier (201), and a voltage regulator (301). Here, the AC modulation impedance (Z2) generally adopts a capacitive impedance, and by controlling the AC modulation switch (S2), the switching in and out of the capacitive impedance connected in series with it is completed, thereby achieving the purpose of AC side load modulation.

[0053] Furthermore, FIG. 6 illustrates a schematic diagram of a voltage wave under an AC modulation scheme, that is, it shows possible wave cases of Vrect resulting from the modulation of the capacitive impedance of FIG. 5.

[0054] It should be noted that, as illustrated in FIG. 6a, capacitive modulation is reactive power modulation, so the wave direction of Vrect may be upward (i.e., Vrect waves upward when the AC modulation switch (S2) is turned on), where the curve with waves is the wave curve of Vrect, the upward protruding part represents the wave of Vrect when the AC modulation switch (S2) is in the turned-on state, and as illustrated in FIG. 6b, the downward recessed part represents the wave of Vrect when the AC modulation switch (S2) is in the turned-off state, i.e., Vrect always waves upward; the wave direction of Vrect may also be downward (i.e., Vrect waves downward when the AC modulation switch (S2) is turned on), and in FIG. 6b, the solid line represents Vrect and the dotted line represents Vout. Here, FIG. 6 illustrates the case of toggling the AC modulation switch (S2) in only a few communication cycles, and sending a communication packet to the transmitting module through the toggling of the AC modulation switch (S2).

[0055] As can be seen in Fig. 6, when oscillating upward, Vout remains stable without changing according to Vrect. This state is referred to as decoupling between Vrect and Vout, which is an ideal case corresponding to Fig. 6a. Fig. 6b represents the aforementioned non-decoupling state, meaning that the voltage difference between Vout and Vrect is relatively small, and Vout changes and oscillates according to Vrect. Generally, the method typically adopted to achieve a stable Vout output for the above AC side modulation scheme is as follows.

[0056] (1) By increasing the voltage difference between Vrect and Vout, for example, Vout can be set to Vout' as shown in Fig. 6b, so that when Vrect fluctuates, Vout' is maintained and does not change. The disadvantage of the above method is that since the voltage difference between Vout' and Vrect is relatively large, the consumption is relatively large when using an LDO voltage stabilizer as a voltage regulator.

[0057] (2) The modulation direction of Vrect is changed so that Vrect always maintains an upward wave during modulation. For example, when wireless charging is performed, the modulation direction of Vrect is detected first. If the wave direction of Vrect is upward, wireless charging is performed immediately and a communication packet is sent by changing the impedance. If the wave direction of Vrect is downward, the state of the AC modulation switch (S2) can be switched before starting wireless charging. For example, the modulation direction can be changed by switching from an off state to an on state or from an on state to an off state.

[0058] In the case of a DC modulation method, the wireless charging system of the embodiment of the present invention adopts a control method in which, when the DC modulation circuit satisfies a preset DC modulation condition, the output port of the receiving module is turned on to output a first output voltage, thereby resolving the non-decoupling phenomenon and preventing the case where Vout waves together with Vrect during the load modulation process.

[0059] In a specific implementation, the DC modulation impedance of the embodiment of the present invention may be a resistor or a current source, and of course, may be other forms of impedance such as a mixed impedance of a resistor and a current source. For example, in an application scenario of one embodiment, if the electronic component is a resistor, the resistor may be used as the DC modulation impedance, or in an application scenario of another embodiment, if it is applied to a current source, the current source may be used as the DC modulation impedance. Specifically, the embodiment of the present invention is not limited thereto, but is based on actual usage cases.

[0060] Additionally, FIG. 7 illustrates a schematic diagram of a DC modulation method, showing an embodiment in which the DC modulation impedance is a resistor and a current source, i.e., a DC resistance modulation and a DC current modulation method. Here, for convenience of explanation, FIG. 7 only illustrates a schematic diagram of a DC modulation method, i.e., including a DC modulation switch (S1) and a DC modulation impedance, where the DC modulation impedance represents a resistor (R2) or a current source (I2), i.e., a modulation resistor or a modulation current source. FIG. 7 also illustrates a rectifier (201) and a voltage regulator (301).

[0061] In a specific implementation, the difference from reactive power modulation under AC modulation is that the DC modulation method of the embodiment of the present invention is active power modulation, and the modulation direction of Vrect brought about by active power modulation is always downward, that is, only when Vrect shown in Fig. 6b waves downward can occur, and when Vrect in Fig. 6a waves upward does not occur.

[0062] For example, the DC modulation switch (S1) controls the DC modulation impedance to be connected to the DC modulation circuit, and then the modulation direction of Vrect uses a downward wave, that is, after connecting the DC modulation impedance, the output voltage Vrect of the rectifier and the output voltage Vout of the output port of the receiving module are lowered.

[0063] In an embodiment of the present invention, the DC modulation method preconfigures DC load modulation conditions so that when the DC modulation circuit satisfies the pre-set DC modulation conditions, it controls the output port of the receiving module by turning on the DC modulation switch to output a first output voltage, and wireless charging can be performed on the battery connected to the receiving module under the first output voltage.

[0064] Specifically, the DC modulation circuit of the embodiment of the present invention satisfies a preset DC load modulation condition, wherein wireless communication is established between a transmitting module and a receiving module, and the DC modulation switch is in a turned-off state; wherein the DC modulation switch in the turned-off state blocks the connection of the DC modulation impedance with the DC modulation circuit.

[0065] Here, establishing wireless communication between the transmitting module and the receiving module means that, prior to charging the battery, a wireless communication connection is first established between the transmitting module and the receiving module, and then the receiving module additionally determines whether its own DC modulation circuit satisfies the DC load modulation condition, and if the DC load modulation condition is satisfied, the output port of the receiving module is controlled to output a first output voltage.

[0066] In actual use, the DC load modulation condition of the embodiment of the present invention means that, under a DC modulation method, before establishing wireless communication between the transmitting module and the receiving module, the DC modulation switch first blocks the connection of the DC modulation impedance with the DC modulation circuit. If, before establishing wireless communication between the transmitting module and the receiving module, the DC modulation switch controls the DC modulation impedance to connect to the DC modulation circuit, the actual implemented direction is a modulation direction in which Vrect waves upward.

[0067] That is, after connecting the DC modulation impedance to the DC modulation circuit in advance, the output voltage Vrect of the rectifier and the output voltage Vout of the output port of the receiving module are first lowered. Thus, when load modulation occurs, the connection of the DC modulation impedance with the DC modulation circuit is blocked, and as the equivalent impedance increases at the output terminal of the rectifier, the output voltage Vrect and the output voltage Vout of the output port of the receiving module may increase, that is, Vrect and Vout may wave upward, meaning the modulation direction of Vrect is upward and the Vout output is stable. Although this method implements decoupling of Vrect and Vout, the default state of the DC modulation switch (S1) is always maintained in an "on" state because the DC modulation impedance is controlled to be connected to the DC modulation circuit in advance. That is, because the DC modulation switch (S1) is always maintained in a turned-on state, the DC modulation impedance (resistor (R2) or current source (I2)) of FIG. 7 is connected to the wireless charging system for a long period, resulting in additional energy consumption.

[0068] Accordingly, in an embodiment of the present invention, the DC load modulation condition is configured such that the DC modulation switch is turned off, and in the default state, the DC modulation switch is controlled to block the connection of the DC modulation impedance with the DC modulation circuit, thereby preventing the additional energy consumption.

[0069] Additionally, after establishing wireless communication between the transmitting module and the receiving module, the DC modulation switch (S1) can be turned on, that is, by controlling the DC modulation switch (S1) to switch to the turned-on state, the DC modulation impedance is connected to the DC modulation circuit, and then, when charging starts, the DC modulation switch is controlled according to a preset time period to switch between the turned-off state and the turned-on state (i.e., by controlling the DC modulation switch (S1) to switch between On and Off), thereby changing the impedance of the DC side of the rectifier, and signal transmission during the wireless charging process is implemented by changing the impedance.

[0070] In addition, before establishing wireless communication between the transmitting module and the receiving module, the DC modulation impedance is not connected, so the DC modulation switch (S1) is turned on, and after the DC modulation impedance is connected to the DC modulation circuit, the phenomenon of Vrect oscillating downward may occur due to the connection of the DC modulation impedance. At the same time, Vout oscillates downward synchronously according to Vrect, and assuming that Vout oscillates downward to Voutb, the controller of the receiving module records Voutb and can maintain Voutb throughout the entire communication process. After wireless communication is completed, the controller of the receiving module can reset Vout to Vouta (i.e., the value before Vout oscillated downward synchronously according to Vrect), which is also referred to as the initial value of Vout. During the wireless charging process, Vout is maintained to output Voutb continuously, so the phenomenon of synchronous downward oscillation according to Vrect does not occur, that is, the occurrence of the above-mentioned non-decoupling phenomenon is prevented.

[0071] Accordingly, the above Voutb represents a downward wave drop value of Vout, or a downward wave drop minimum value of Vout, and the first output voltage of the embodiment of the present invention is determined based on the drop value Voutb, for example, by setting the first output voltage directly to Voutb or setting it lower than Voutb.

[0072] Accordingly, the first output voltage of the embodiment of the present invention may be set as sampling proceeds after the DC modulation switch (S1) is first turned on and Vout is dropped and stabilized before establishing wireless communication between the transmitting module and the receiving module, or a relatively low value may be selected according to an empirical value to have a sufficient margin. The empirical value may be a value related to load size and coil coupling. That is, the controller of the receiving module of the embodiment of the present invention is further configured to acquire a pre-recorded output reference voltage, wherein the output reference voltage is a voltage value output from the receiving module recorded when the DC modulation switch is first switched to the turned-on state (e.g., Voutb); the output reference voltage is determined as the first output voltage, and the receiving module is controlled to output the first output voltage.

[0073] In actual use, in order to increase the stability of the DC modulation method in the embodiment of the present invention, that is, to obtain a more appropriate first output voltage every time wireless charging is performed, in the embodiment of the present invention, a drop detection test of Vout may be performed before the receiving module communicates with the transmitting module to send a packet. That is, wireless communication is established between the receiving module and the transmitting module, and before the receiving module sends a communication signal to the transmitting module, the receiving module performs at least one drop detection test process until the difference between the voltage output from the rectifier of the receiving module and the voltage output from the output port of the receiving module satisfies a preset threshold value, and after determining the voltage output from the output port of the receiving module as the first output voltage, the receiving module is controlled to send a communication signal to the transmitting module, and when sending the communication signal, the output port of the receiving module is controlled to output the first output voltage.

[0074] Here, the drop detection test process is,

[0075] (1) Control the DC modulation switch to switch to the turn-on state; at this time, record the voltage output from the output port of the receiving module in the turn-on state, and then turn off the DC modulation switch;

[0076] (2) After that, the DC modulation switch is controlled according to a preset time interval to be switched back to the turn-on state, and the output port of the receiving module is controlled to output the last recorded voltage;

[0077] (3) At this time, monitoring the difference between the voltage output from the rectifier of the receiving module and the voltage output from the output port;

[0078] (4) If the difference value satisfies a preset threshold, the drop detection test process is stopped; if the difference value does not satisfy the preset threshold (generally, exceeds the preset threshold), the voltage output from the output port is re-determined until the difference value satisfies the preset threshold (e.g., the voltage output from the output port of the receiving module in the turn-on state is re-recorded, or the previously recorded voltage can be appropriately increased or decreased).

[0079] For ease of understanding, FIG. 8 illustrates a schematic diagram of the voltage waveform of a drop detection test, and as shown in FIG. 8, Vrect is indicated by a solid line and Vout by a dotted line.

[0080] When the receiving module and the transmitting module do not communicate, the DC modulation switch (S1) is turned off in the default state, thereby blocking the connection of the DC modulation impedance with the DC modulation circuit. At this time, the output value of Vout in the corresponding FIG. 8 is Vouta. Wireless communication is established between the receiving module and the transmitting module, but before communicating and sending a packet, the DC modulation switch (S1) is turned on for a certain period of time (e.g., a drop period corresponding to the vertical dotted line in FIG. 8). This can also be called "Try ON" and can be used as a "communication attempt" step. Since the DC modulation switch (S1) is turned on and the DC modulation impedance is connected, Vout decreases according to Vrect. When Vout stabilizes within the Try ON time, the controller of the receiving module detects the Vout value and can record the value.

[0081] Although only a schematic diagram of several communication steps is illustrated and explained in FIG. 8, it should be understood that the specific communication duration is based on actual usage cases, and the embodiments of the present invention are not limited thereto.

[0082] Before establishing wireless communication between the receiving module and the transmitting module and formally sending a communication packet, the controller of the receiving module actively sets Vout to a value lower than the value recorded during the "Try ON" or the recorded value (satisfying a certain margin), i.e., Voutb of FIG. 8, and maintains Voutb during the communication process. After communication is completed, the DC modulation switch (S1) is controlled to switch to a default turn-off state, at which time Vout is restored from Voutb to the original Vouta.

[0083] It should be noted that FIG. 8 illustrates only one drop detection test process, that is, a schematic diagram of one "Try On," and it should be understood that it occurs more than once during the "Try On" period. For example, a second "Try On" (not shown in FIG. 8) may be activated, and during the second "Try On," the controller of the receiving module turns on S1 and sets Vout to the value recorded during the first "Try On." Afterward, the controller can monitor Vrect and Vout. If a large difference is detected between Vrect and Vout, and the difference value is greater than a preset difference value, the setting value of Vout is appropriately modified (increased or decreased), and then a third and fourth drop detection test process can be performed. The final objective is to minimize the loss of the voltage regulator by ensuring that the determined first output voltage is slightly higher than the minimum value of Vrect during the communication packet transmission process.

[0084] Therefore, through the above process, the embodiment of the present invention can effectively solve the problem of Vrect and Vout being de-decoupled during the load modulation process, while having the following advantages.

[0085] (1) Since there is no need to increase the voltage difference between Vrect and Vout, losses due to additional voltage differences are prevented.

[0086] (2) When there is no communication between the receiving module and the transmitting module, there is no need to be connected for a long time to a DC modulation impedance such as the modulation resistor or modulation current source shown in FIG. 7, thus preventing additional losses due to the modulation resistor or modulation current source.

[0087] Furthermore, based on the above embodiment, an embodiment of the present invention further provides a wireless charging method, said method applied to a wireless charging system provided in the above embodiment, and as illustrated in the flowchart of the wireless charging method of FIG. 9, said method comprises the following steps.

[0088] In step S102, in response to the establishment of a wireless communication connection between the receiving module and the transmitting module of the wireless charging system, it is determined whether the DC modulation circuit corresponding to the receiving module satisfies a preset DC load modulation condition.

[0089] In step S104, when a preset DC load modulation condition is satisfied, the output port of the receiving module is controlled by turning on the DC modulation switch to output a first output voltage.

[0090] Here, the first output voltage of the embodiment of the present invention is smaller than the DC voltage output from the rectifier; and the DC modulation switch in the turn-on state causes the DC modulation impedance to be connected to the DC modulation circuit.

[0091] In step S106, wireless charging is performed on the battery connected to the receiving module under the first output voltage.

[0092] In a specific implementation, the DC modulation circuit of the embodiment of the present invention satisfies a preset DC load modulation condition, wherein wireless communication is established between a transmitting module and a receiving module, and the DC modulation switch is in a turned-off state; wherein the DC modulation switch in the turned-off state blocks the connection of the DC modulation impedance with the DC modulation circuit.

[0093] Specifically, in step S104, the step of controlling the output port of the receiving module to output a first output voltage by turning on the DC modulation switch comprises: controlling the receiving module to perform at least one drop detection test process until the difference between the voltage output from the rectifier of the receiving module and the voltage output from the output port of the receiving module satisfies a preset threshold value before the receiving module sends a communication signal to the transmitting module, and determining the voltage output from the output port of the receiving module as the first output voltage; and

[0094] The method includes the step of controlling a receiving module to send a communication signal to a transmitting module, and when sending the communication signal, controlling the output port of the receiving module to output a first output voltage;

[0095] Here, the step of performing the drop detection test process is,

[0096] The method includes the steps of: controlling a DC modulation switch to switch to a turn-on state; recording the voltage output from the output port of the receiving module in the turn-on state, and then turning off the DC modulation switch; controlling the DC modulation switch to switch back to a turn-on state according to a preset time interval, and controlling the output port of the receiving module to output the recorded voltage; monitoring the difference value between the voltage output from the rectifier of the receiving module and the voltage output from the output port; stopping the drop detection test process if the difference value satisfies a preset threshold value; and if the difference value does not satisfy the preset threshold value, re-determining the voltage output from the output port until the difference value satisfies the preset threshold value.

[0097] Furthermore, in the above step S104, the step of controlling the output port of the receiving module to output a first output voltage by turning on the DC modulation switch further includes: a step of obtaining a pre-recorded output reference voltage - the output reference voltage is a voltage value output from the receiving module recorded when the DC modulation switch is first switched to the turn-on state - and a step of determining the output reference voltage as the first output voltage and controlling the output port of the receiving module to output the first output voltage.

[0098] Furthermore, in order for the DC modulation circuit to satisfy a preset DC load modulation condition, an embodiment of the present invention may further include the step of switching the DC modulation switch to a turn-off state in response to the wireless communication connection between the receiving module and the wireless charging transmitting module being cut off; or the step of switching the state of the DC modulation switch to a turn-off state in response to the completion of wireless charging of the battery connected to the receiving module.

[0099] Furthermore, the step of the receiving module sending a communication signal to the transmitting module includes the step of changing the impedance by controlling a DC modulation switch according to a preset time period to switch between a turn-off state and a turn-on state in order to maintain wireless communication between the transmitting module and the receiving module.

[0100] Furthermore, the method further includes a step of establishing wireless communication between the transmitting module and the receiving module, wherein if the DC modulation switch is in a turned-on state, the DC modulation circuit determines that it does not satisfy a preset DC load modulation condition; or, if the load modulation mode of the receiving module is an AC modulation mode, the DC modulation circuit determines that it does not satisfy a preset DC load modulation condition.

[0101] Additionally, if the load modulation mode of the receiving module is an AC modulation mode, the method further includes a step of determining whether the current output voltage of the rectifier and the output voltage of the output port of the receiving module are in a decoupling state; if they are in a decoupling state, a step of controlling the AC modulation switch according to a preset time period to switch between a turn-off state and a turn-on state to maintain wireless communication between the transmitting module and the receiving module; and if they are not in a decoupling state, a step of performing modulation with respect to the modulation direction of the output voltage of the rectifier, and then controlling the AC modulation switch according to a preset time period to switch between a turn-off state and a turn-on state to maintain wireless communication between the transmitting module and the receiving module.

[0102] Here, the AC modulation mode corresponds to the AC modulation method illustrated in FIGS. 5 and FIGS. 6 described above, and specifically, the contents corresponding to FIGS. 5 and FIGS. 6 described above may be referenced, and the embodiments of the present invention are not limited thereto.

[0103] Furthermore, in AC modulation mode, if the output voltage of the rectifier and the output voltage of the output port of the receiving module are in a non-decoupling state, the method further includes the step of obtaining a pre-configured second output voltage and controlling the output port of the receiving module to output the second output voltage to perform wireless charging for a battery connected to the receiving module; wherein the second output voltage is smaller than the output voltage of the rectifier, and the difference between the second output voltage and the output voltage of the rectifier is greater than a preset threshold value.

[0104] In actual use, the controller of the receiving module of the embodiment of the present invention can set the current load modulation mode according to a pre-configured case. Taking the structural block diagram of the wireless charging system illustrated in FIG. 3 as an example, when both a DC modulation circuit and an AC modulation circuit are configured in the wireless charging system, the controller of the receiving module can determine the current load modulation mode according to the configuration information. Furthermore, in the case of the DC modulation circuit, the default state of the DC modulation switch (S1) can be additionally configured; that is, the default state of the DC modulation switch can be set to a turn-on state or a turn-off state. If the default state of the DC modulation switch is a turn-off state, the wireless charging method of the embodiment of the present invention can be performed. Otherwise, a corresponding load modulation method can be selected according to the actual configuration case to proceed with wireless charging. Specifically, it can be set according to the actual use case, and the embodiment of the present invention is not limited thereto.

[0105] Furthermore, an embodiment of the present invention further provides an electronic device, wherein a wireless charging system is disposed on the electronic device, and the battery of the electronic device is a rechargeable battery, and the battery is connected to an output port of a receiving module of the wireless charging system.

[0106] Since the wireless charging method and electronic device provided in the embodiment of the present invention have the same technical features as the wireless charging system provided by the aforementioned embodiment, they can solve the same technical problems and achieve the same technical effects.

[0107] A computer program product of a wireless charging system, method, and electronic device provided by an embodiment of the present invention comprises a computer-readable storage medium storing program code, and instructions included in said program code can be used to perform a method according to the preceding method embodiment, and specific implementation may refer to the method embodiment, and redundant descriptions thereof will be omitted.

[0108] Those skilled in the art will clearly understand that, for the convenience and brevity of explanation, the specific operation process of the electronic device described above may refer to the corresponding process of the aforementioned embodiment, and redundant explanations will be omitted here.

[0109] Furthermore, in the description of the embodiments of the present invention, terms such as "mounting" and "connection" should be understood in a broad sense unless otherwise specified or limited. For example, they may be fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections, direct connections, indirect connections through an intermediate medium, or communication between the interiors of two components. A person skilled in the art will be able to specifically understand the specific meanings of the above terms in the present invention.

[0110] When the above function is implemented in the form of a software function unit and sold or used as an independent product, it may be stored on a computer-readable storage medium. Based on this understanding, the technical solution of the present invention may be implemented in the form of a software product, which is essentially or contributes to the prior art, or a part of the technical solution, said computer software product is stored on a storage medium and includes a number of instructions that cause a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in the embodiments of the present invention. The aforementioned storage medium includes U disks, mobile hard disks, Read-Only Memory (ROM), Random Access Memory (RAM), magnetic disks or optical disks, and various other media capable of storing program code.

[0111] In describing the present invention, it should be noted that the orientations or positional relationships indicated by terms such as "center," "top," "bottom," "left," "right," "vertical," "horizontal," "inside," and "outside" are merely for the convenience of describing the invention and for the simplification of the description, and do not indicate or imply that the mentioned devices or components must have a specific orientation or be configured and operated in a specific orientation, and therefore should not be interpreted as a limitation on the present invention. Furthermore, terms such as "first," "second," and "third" are used only for the purpose of explanation and should not be understood as indicating or implying relative importance.

[0112] Finally, it should be noted that the above embodiments are merely specific embodiments of the present invention and are used to explain the technical methods of the present invention, not to limit them, and the scope of protection of the present invention is not limited thereto. Although the present invention has been described in detail above with reference to the aforementioned embodiments, anyone skilled in the art will understand that modifications or changes to the technical methods described in the aforementioned embodiments can be easily conceived within the technical scope disclosed in the present invention, and equivalent substitutions can be made for some technical features; such modifications, changes, or substitutions do not cause the essence of the technical methods to deviate from the spirit and scope of the technical methods of the embodiments of the present invention, and all of them must be included within the scope of protection of the present invention. Accordingly, the scope of protection of the present invention must comply with the scope of protection of the claims. Explanation of the symbols

[0113] 10: Transmitter module 20: Receiver module 101: Inverter 201: Rectifier 301: Voltage Regulator

Claims

Claim 1 In a wireless charging system, the wireless charging system comprises a receiving module and a transmitting module; a circuit modulation module is disposed in the rectifier of the receiving module; the circuit modulation module includes a DC modulation circuit corresponding to a DC modulation mode; the DC modulation circuit is installed on the DC side of the rectifier; the DC modulation circuit includes a DC modulation impedance and a DC modulation switch connected in series with the DC modulation impedance, and the DC modulation switch is used to control the connection state between the DC modulation impedance and the rectifier; the rectifier is wirelessly connected to an AC power source to rectify the AC power source and output a DC voltage; the controller of the receiving module is connected to the rectifier and is configured to control the output port of the receiving module to output a first output voltage by turning on the DC modulation switch when the DC modulation circuit satisfies a preset DC modulation condition, and to proceed with wireless charging for a battery connected to the receiving module under the first output voltage, wherein the first output voltage is smaller than the DC voltage output from the rectifier;A wireless charging system characterized by the above DC modulation switch such that the DC modulation impedance is connected to the DC modulation circuit when in the turned-on state, and when the receiving module controls the output port of the receiving module by turning on the DC modulation switch to output a first output voltage, wireless communication is established between the receiving module and the transmitting module, wherein, before the receiving module sends a communication signal to the transmitting module, the receiving module is controlled to perform at least one drop detection test process until the difference between the voltage output from the rectifier of the receiving module and the voltage output from the output port of the receiving module satisfies a preset threshold value, the voltage output from the output port of the receiving module is determined as the first output voltage, the receiving module is controlled to send a communication signal to the transmitting module, and when sending the communication signal, the output port of the receiving module is controlled to output the first output voltage. Claim 2 A wireless charging system according to claim 1, characterized in that the transmitting module is connected to a DC power source, converts the DC power source into an AC power source, and is used to couple the AC power source to the receiving module. Claim 3 A wireless charging system according to claim 1, wherein the circuit modulation module further comprises an AC modulation circuit corresponding to an AC modulation mode; the AC modulation circuit is installed on the AC side of the rectifier; the AC modulation circuit comprises an AC modulation impedance and an AC modulation switch connected in series with the AC modulation impedance, and the AC modulation switch is used to control the connection state between the AC modulation impedance and the rectifier. Claim 4 A wireless charging system according to claim 2, wherein the DC modulation circuit satisfies a preset DC load modulation condition, wherein wireless communication is established between the transmitting module and the receiving module, and the DC modulation switch is in a turned-off state, and wherein the DC modulation switch in the turned-off state blocks the connection of the DC modulation impedance with the DC modulation circuit. Claim 5 A wireless charging system according to claim 2, wherein, when performing the drop detection test process, the DC modulation switch is controlled to switch to a turn-on state; after recording the voltage output from the output port of the receiving module in the turn-on state, the DC modulation switch is turned off, and the DC modulation switch is controlled to switch back to a turn-on state according to a preset time interval, and the output port of the receiving module is controlled to output the recorded voltage, and the difference value between the voltage output from the rectifier of the receiving module and the voltage output from the output port is monitored, and if the difference value satisfies a preset threshold value, the drop detection test process is stopped, and if the difference value does not satisfy the preset threshold value, the voltage output from the output port is re-determined until the difference value satisfies the preset threshold value. Claim 6 A wireless charging system according to claim 1, wherein the controller is further configured to acquire a pre-recorded output reference voltage—the output reference voltage being a voltage value output from the receiving module recorded when the DC modulation switch is first switched to a turn-on state—and further configured to determine the output reference voltage as the first output voltage and to control the receiving module to output the first output voltage. Claim 7 A wireless charging system according to claim 1, wherein the wireless charging system further includes a voltage regulator installed on the DC side of the rectifier, and the controller is further configured to control the output port by controlling the voltage regulator to output the first output voltage. Claim 8 A wireless charging method applied to a wireless charging system according to any one of claims 1 to 7, comprising: a step of determining whether a DC modulation circuit corresponding to the receiving module satisfies a preset DC load modulation condition in response to the establishment of a wireless communication connection between the receiving module and the transmitting module of the wireless charging system; and a step of, if the preset DC load modulation condition is satisfied, controlling the output port of the receiving module by turning on the DC modulation switch to output a first output voltage - wherein the first output voltage is smaller than the DC voltage output from the rectifier; and wherein the DC modulation switch causes the DC modulation impedance to be connected to the DC modulation circuit when in the turned-on state. A wireless charging method comprising the step of performing wireless charging on a battery connected to the receiving module under the first output voltage, wherein the step of controlling the output port of the receiving module to output the first output voltage by turning on the DC modulation switch comprises: a step of controlling the receiving module to perform at least one drop detection test process until the difference value between the voltage output from the rectifier of the receiving module and the voltage output from the output port of the receiving module satisfies a preset threshold value before the receiving module sends a communication signal to the transmitting module, and determining the voltage output from the output port of the receiving module as the first output voltage; and a step of controlling the receiving module to send a communication signal to the transmitting module, and when sending the communication signal, controlling the output port of the receiving module to output the first output voltage. Claim 9 A wireless charging method according to claim 8, wherein the DC modulation circuit satisfies a preset DC load modulation condition, wherein wireless communication is established between the transmitting module and the receiving module, and the DC modulation switch is in a turned-off state; and wherein the DC modulation switch in the turned-off state blocks the connection of the DC modulation impedance with the DC modulation circuit. Claim 10 A wireless charging method according to claim 8, wherein the step of performing the drop detection test process comprises: controlling the DC modulation switch to switch to a turn-on state; recording the voltage output from the output port of the receiving module in the turn-on state, and then turning off the DC modulation switch; controlling the DC modulation switch to switch back to a turn-on state according to a preset time interval, and controlling the output port of the receiving module to output the recorded voltage; monitoring the difference value between the voltage output from the rectifier of the receiving module and the voltage output from the output port; stopping the drop detection test process if the difference value satisfies a preset threshold value; and if the difference value does not satisfy the preset threshold value, re-determining the voltage output from the output port until the difference value satisfies the preset threshold value. Claim 11 A wireless charging method according to claim 8, wherein the step of controlling the output port of the receiving module to output a first output voltage by turning on the DC modulation switch comprises: a step of obtaining a pre-recorded output reference voltage—the output reference voltage being a voltage value output from the receiving module recorded when the DC modulation switch is first switched to the turn-on state—and further comprising the step of determining the output reference voltage as the first output voltage and controlling the output port of the receiving module to output the first output voltage. Claim 12 A wireless charging method according to claim 8, further comprising: a step of switching the DC modulation switch to a turn-off state in response to the wireless communication connection between the receiving module and the transmitting module of the wireless charging system being cut off; or a step of switching the DC modulation switch to a turn-off state in response to the completion of wireless charging of the battery connected to the receiving module. Claim 13 A wireless charging method according to claim 10, wherein the step of the receiving module sending a communication signal to the transmitting module includes the step of controlling the DC modulation switch according to a preset time period to switch between a turn-off state and a turn-on state in order to maintain wireless communication between the transmitting module and the receiving module. Claim 14 A wireless charging method according to claim 9, wherein the method further comprises the step of establishing wireless communication between the transmitting module and the receiving module, and determining that if the DC modulation switch is in a turned-on state, the DC modulation circuit does not satisfy a preset DC load modulation condition; or, determining that if the load modulation mode of the receiving module is an AC modulation mode, the DC modulation circuit does not satisfy a preset DC load modulation condition. Claim 15 A wireless charging method according to claim 14, wherein the method further comprises: a step of determining whether the output voltage of the rectifier and the output voltage of the output port of the receiving module are in a decoupling state if the load modulation mode of the receiving module is an AC modulation mode; a step of, if in a decoupling state, controlling the AC modulation switch of the AC modulation circuit included in the circuit modulation module according to a preset time period to switch between a turn-off state and a turn-on state in order to maintain wireless communication between the transmitting module and the receiving module; and, if not in a decoupling state, a step of, after performing modulation with respect to the modulation direction of the output voltage of the rectifier, controlling the AC modulation switch according to a preset time period to switch between a turn-off state and a turn-on state in order to maintain wireless communication between the transmitting module and the receiving module. Claim 16 A wireless charging method according to claim 15, wherein the method further comprises the step of, when the output voltage of the rectifier and the output voltage of the output port of the receiving module are in a non-decoupling state, obtaining a pre-configured second output voltage and controlling the output port of the receiving module to output the second output voltage, thereby performing wireless charging for a battery connected to the receiving module, wherein the second output voltage is smaller than the output voltage of the rectifier, and the difference value between the second output voltage and the output voltage of the rectifier is greater than a preset threshold value. Claim 17 An electronic device, wherein a wireless charging system according to any one of claims 1 to 7 is disposed in the electronic device, and the battery of the electronic device is a rechargeable battery, and the battery is connected to the output port of a receiving module of the wireless charging system.

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