CN112186823B

CN112186823B - Wireless charging method, circuit and system

Info

Publication number: CN112186823B
Application number: CN201910603219.3A
Authority: CN
Inventors: 王彦腾; 陈朝喜; 孙长宇
Original assignee: Beijing Xiaomi Mobile Software Co Ltd
Current assignee: Beijing Xiaomi Mobile Software Co Ltd
Priority date: 2019-07-05
Filing date: 2019-07-05
Publication date: 2022-09-30
Anticipated expiration: 2039-07-05
Also published as: CN112186823A

Abstract

The embodiment of the application discloses a wireless charging method, a wireless charging circuit and a wireless charging system, and belongs to the technical field of wireless charging. The method comprises the following steps: when the wireless power transmitting equipment is positioned in the power transmission range of the wireless power transmitting equipment, performing quick charging authentication on the wireless power transmitting equipment; if the wireless power transmitting equipment passes the quick charging authentication, establishing out-of-band communication with the wireless power transmitting equipment; receiving charger parameters sent by the wireless power sending equipment through out-of-band communication, wherein the charger parameters are used for indicating the charging capacity of a charger connected with the wireless power sending equipment; according to the charger parameters, the battery packs are charged through a first charging management chip and a second charging management chip, the first charging management chip is used for carrying out non-quick charging on the battery packs, and the second charging management chip is used for carrying out quick charging on the battery packs.

Description

Wireless charging method, circuit and system

Technical Field

The embodiment of the application relates to the technical field of wireless charging, in particular to a wireless charging method, circuit and system.

Background

The charging modes of the mobile terminal include wired charging and wireless charging, at present, the mobile terminal adopts more and more wireless charging scenes, and the problem of how to improve the efficiency of the wireless charging is also concerned.

In the related art, the wireless charging circuit of the mobile terminal mainly adopts an LDO/Buck architecture, and under the architecture, the charging efficiency of wireless charging is about 70%, and the charging power is about 10W. Taking the LDO architecture as an example, to further increase the charging power of the wireless charging, the output voltage or the output current (input to the charging management chip) of the LDO may be increased.

However, due to the limitation of the input voltage of the charging management chip in the wireless charging circuit, the charging power cannot be greatly increased by increasing the output voltage; however, the method of increasing the output current may cause a serious heat generation problem.

Disclosure of Invention

The embodiment of the disclosure provides a wireless charging method, a wireless charging circuit and a wireless charging system, which can solve the problem that the charging power of wireless charging is limited in the related art. The technical scheme is as follows:

in one aspect, a wireless charging method is provided, the method being used for a wireless power receiving device, the method including:

when the wireless power transmitting equipment is positioned in the power transmission range of the wireless power transmitting equipment, performing quick charging authentication on the wireless power transmitting equipment;

if the wireless power transmitting equipment passes the quick charging authentication, establishing out-of-band communication with the wireless power transmitting equipment;

receiving charger parameters sent by the wireless power sending equipment through out-of-band communication, wherein the charger parameters are used for indicating the charging capacity of a charger connected with the wireless power sending equipment;

and charging a plurality of strings of battery packs through a first charging management chip and a second charging management chip according to the charger parameters, wherein the first charging management chip is used for carrying out non-quick charging on the plurality of strings of battery packs, and the second charging management chip is used for carrying out quick charging on the plurality of strings of battery packs.

In another aspect, a wireless charging method is provided, the method being for a wireless power transmitting device, the method comprising:

when the charger is connected with a charger, acquiring charger parameters of the charger, wherein the charger parameters are used for indicating the charging capacity of the charger;

when the wireless power receiving equipment is positioned in a power transmission range and passes the quick charging authentication of the wireless power receiving equipment, establishing out-of-band communication with the wireless power receiving equipment;

transmitting charger parameters to the wireless power receiving device via out-of-band communication.

In another aspect, there is provided a power receiving circuit for a wireless power receiving device, the power receiving circuit including: the device comprises a power receiving coil, a receiver, a processor, a first charging management chip, a second charging management chip, a plurality of strings of battery packs and a first communication assembly;

the power receiving coil is connected with the receiver;

the receiver is respectively connected with the first charging management chip and the second charging management chip, the processor is connected with the receiver, and the processor is used for controlling and inputting the voltage of the first charging management chip and the second charging management chip through the receiver;

the first charging management chip is connected with the multiple strings of battery packs and is used for carrying out non-quick charging on the multiple strings of battery packs; the second charging management chip is connected with the multiple strings of battery packs and is used for quickly charging the multiple strings of battery packs;

the processor is further coupled to the first communication assembly for out-of-band communication with a wireless power transmitting device via the first communication assembly.

In another aspect, there is provided a power transmission circuit for a wireless power transmission device, the power transmission circuit including: a power transmitting coil, a transmitter, a controller, and a second communication assembly;

the transmitter is connected with the power transmitting coil, and the power transmitting coil is used for transmitting power to the wireless power receiving equipment;

the controller is connected with the second communication assembly and the transmitter respectively, and the controller is used for carrying out-of-band communication with the wireless power receiving equipment through the second communication assembly.

In another aspect, a wireless charging system is provided, where the wireless charging system includes: a wireless power transmitting device and a wireless power receiving device;

the wireless power transmission apparatus includes the power transmission circuit as described in the above aspect;

the wireless power receiving apparatus includes the power receiving circuit according to the above aspect.

In the embodiment of the application, when the wireless power receiving equipment is located in the power transmission range of the wireless power transmitting equipment, the wireless power receiving equipment carries out quick charging authentication on the wireless power transmitting equipment, and establishes out-of-band communication with the wireless power transmitting equipment when the wireless power receiving equipment passes the quick charging authentication, so that charger parameters transmitted by the wireless power transmitting equipment are received through the out-of-band communication, and then a plurality of strings of battery packs are charged through the first charging management chip and the second charging management chip according to the charger parameters; because the second charging management chip can quickly charge and charge the battery packs, when the charger is indicated by the charger parameters to be a quick-charging charger, the wireless power receiving equipment can charge the battery packs by using the second charging management chip, so that the wireless charging efficiency is improved, and meanwhile, when the charger is indicated by the charger parameters to be a non-quick-charging charger, the battery packs can still be charged through the first charging management chip in a non-quick-charging manner, so that the application range of wireless charging is improved.

Drawings

Fig. 1 is a schematic diagram illustrating a wireless charging system according to an exemplary embodiment of the present application;

fig. 2 illustrates a circuit schematic diagram of a power transmitting circuit and a power receiving circuit provided in an exemplary embodiment of the present application;

fig. 3 illustrates a circuit schematic diagram of a power transmitting circuit and a power receiving circuit provided by another exemplary embodiment of the present application;

fig. 4 is a flowchart illustrating a wireless charging method according to an exemplary embodiment of the present application;

fig. 5 shows a flowchart of a wireless charging method provided by another exemplary embodiment of the present application;

fig. 6 shows a hardware structure diagram of a mobile terminal according to an exemplary embodiment of the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Reference herein to "a plurality" means two or more. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship.

Referring to fig. 1, a schematic diagram of a wireless charging system provided in an exemplary embodiment of the present application is shown, where the wireless charging system includes a wireless power transmitting apparatus 10 and a wireless power receiving apparatus 11.

The wireless power transmission device 10 refers to a device for supplying power to a power-using device in wireless charging. The name of the wireless power transmitting device 10 may be different in different application scenarios. For example, when the wireless power transmitting device 10 is used to wirelessly charge a portable electronic device such as a cell phone, a tablet, a wearable device, etc., the wireless power transmitting device 10 may be referred to as a charging cradle, a charging tray, etc. For another example, when the wireless power transmitting apparatus 10 is used for wirelessly charging a vehicle such as an electric vehicle, the wireless power transmitting apparatus 10 may be referred to as a charging pile, a wireless charging pile, or the like.

The wireless power receiving device 11 refers to a device for receiving power in wireless charging, that is, a power-using device. The wireless power receiving device 11 may be any electric device supporting wireless charging, such as a mobile phone, a tablet computer, a wearable device, an electric vehicle, and the like, which is not limited in the embodiment of the present disclosure.

In one possible implementation, the wireless charging communication means between the wireless power transmission device 10 and the wireless power reception device 11 includes at least one of in-band communication or out-of-band communication. The in-band communication is a mode of communication based on a working frequency band of wireless charging, and the out-of-band communication is a mode of communication by adopting a non-working frequency band of wireless charging. In fig. 1, in an in-band communication process, a wireless power transmitting device 10 and a wireless power receiving device 11 communicate based on an operating frequency band of wireless charging; in the out-of-band Communication process, the wireless power transmitting device 10 and the wireless power receiving device 11 communicate in an operating frequency band (a frequency band outside the operating frequency band for wireless charging) of the Communication component through a Communication component, and optionally, the Communication component may be at least one of a bluetooth chip, a Near Field Communication (NFC) chip, and a ZigBee chip.

In the wireless charging system shown in fig. 1, the wireless power transmitting device 10 includes a power transmitting circuit, and the wireless power receiving device 11 includes a power receiving circuit, and during the wireless charging process, the wireless power transmitting device 10 and the wireless power receiving device 11 are charged through the power transmitting circuit and the power receiving circuit, please refer to fig. 2, which shows a circuit schematic diagram of the power transmitting circuit and the power receiving circuit.

Schematically, as shown in fig. 2, the power transmitting circuit 20 includes a power transmitting coil 201, a transmitter 202, a second communication component 203, and a controller 204; the power receiving circuit 21 includes a power receiving coil 211, a receiver 212, a first communication component 213, a processor 214, a first charge management chip 215, a second charge management chip 216, and a multi-string battery pack 217.

The connection method on the power transmission circuit 20 side includes: the transmitter 202 is connected to the power transmitting coil 201 and the controller 204 is connected to the second communication assembly 203 and the transmitter 202, respectively.

The connection method on the power receiving circuit 21 side includes: the power receiving coil 211 is connected to the receiver 212, the receiver 212 is connected to the first charging management chip 215 and the second charging management chip 216, respectively, the first charging management chip 215 is connected to the plurality of strings of battery packs 217, the second charging management chip 216 is connected to the plurality of strings of battery packs 217, and the processor 214 is further connected to the first communication component 213.

In the power transmitting circuit 20, the power transmitting coil 201 (and the capacitor connected in series) is used to transmit a wireless power signal to the power receiving circuit 21 by the principle of electromagnetic induction. Accordingly, in the power receiving circuit 21, the power receiving coil 211 (and the capacitor connected in series) is used for receiving the wireless power signal transmitted by the power transmitting circuit 20 by the electromagnetic induction principle and inputting the wireless power signal to the receiver 212.

When the power transmitting circuit 20 is connected to a charger, the charger outputs a dc power signal, and the power transmitting coil 201 needs to output an ac power signal, so the transmitter 202 includes a full-bridge inverter circuit or a half-bridge inverter circuit, and converts the dc power signal input from one side of the transmitter 202 into an ac power signal through the full-bridge inverter circuit or the half-bridge inverter circuit and outputs the ac power signal to the power transmitting coil 201. Accordingly, the power receiving circuit 21 side needs to convert the ac power signal input from the power receiving coil 211 into a dc power signal, and therefore the receiver 212 includes a rectifying circuit for converting the ac power signal into the dc power signal.

In one possible implementation, the receiver 212 further includes a modulation and demodulation circuit for modulating and demodulating the wireless power signal during the wireless charging process; the control circuitry is in data communication with the processor 214.

In one possible implementation, data transmission is performed between the wireless power transmitting device 10 and the wireless power receiving device 11 through in-band communication of Qi specification, however, the in-band communication signal quality is susceptible to load fluctuation and coil coupling, which may result in signal demodulation failure and ultimately interruption of wireless charging.

Optionally, the wireless power transmitting device 10 and the wireless power receiving device 11 may also perform data transmission through out-of-band communication, and since the out-of-band communication signal is not easily affected by the load fluctuation and the coil coupling, the quality of the communication signal is improved compared with that of in-band communication.

In order to enable out-of-band communication between the wireless power transmitting device 10 and the wireless power receiving device 11, the power transmitting circuit 20 is further provided with a second communication component 203, the second communication component 203 being connected to a controller 204, the controller 204 being configured to communicate out-of-band with the wireless power receiving device 11 via the second communication component 203.

Accordingly, the power receiving circuit 21 is provided with a first communication component 213, and the first communication component 213 is connected to the processor 214, and the processor 214 is configured to communicate with the wireless power transmitting device 10 out of band through the first communication component 213.

In a possible embodiment, the power transmitting circuit 20 in the present application can be adapted to different types of chargers, such as a general Dedicated Charging Port (DCP) charger, a Quick Charge (QC) 1.0 charger, a QC2.0 charger, a QC3.0 charger, and a QC4.0 charger, so that the wireless power receiving device 11 can control a corresponding Charging management chip to Charge the battery packs 217 according to the type of the charger, and the controller 204 in the power transmitting circuit 20 is further configured to obtain the charger parameters of the charger through the transmitter 202 and transmit the charger parameters to the wireless power receiving device 11 through the second communication component 203, where the charger parameters are used for indicating the Charging capability of the charger connected to the wireless power transmitting device 10.

Accordingly, in the power receiving circuit 21, the processor 214 receives the charger parameter sent by the second communication module 203 through the first communication module 213, and controls the first charging management chip 215 and the second charging management chip 216 to charge the plurality of strings of battery packs 217 according to the charger parameter, wherein the receiver 212 is connected to the first charging management chip 215 and the second charging management chip 216 respectively, and is connected to the processor 214, and the processor 214 controls the voltage input to the first charging management chip 215 and the second charging management chip 216 through the receiver 212.

Optionally, in the wireless charging process, different charging management chips are selected to charge the multiple strings of battery packs 217 by determining whether the battery voltage reaches a voltage threshold, where the multiple strings of battery packs 217 are battery packs formed by connecting multiple battery cells in series, a negative electrode of each battery cell is connected to a positive electrode of an adjacent battery cell, and a maximum voltage of each battery cell is a sum of maximum voltages of the battery cells. Schematically, as shown in fig. 2, the present embodiment will be described by taking an example in which a plurality of strings of battery packs 217 are formed by connecting two battery cells in series.

In the existing charging theory, three charging phases are involved: the charging stage when the voltage of the battery does not reach the voltage threshold can be understood as the pre-charging stage (i.e., the non-fast charging stage is correspondingly divided in the embodiment of the present application), and the charging stage when the voltage of the battery reaches the voltage threshold can be understood as the fast charging stage corresponding to the embodiment of the present application. In the process that the first charging management chip 215 and the second charging management chip 216 charge the strings of battery packs 217, the first charging management chip 215 is used for performing non-fast charging on the strings of battery packs 217; the second charging management chip 216 is configured to perform fast charging on a plurality of strings of battery packs 217, where the plurality of strings of battery packs 217 are configured to supply power to each component in the wireless power receiving device 11.

Optionally, the processor 214 is further configured to control the first charging management chip 215 to charge the multiple strings of battery packs 217 when the battery voltages of the multiple strings of battery packs 217 do not reach the voltage threshold. In one possible embodiment, the plurality of strings of battery packs 217, or the first charge management chip 215, has disposed therein a fuel gauge for transmitting a current battery state to the processor 214, the current battery state including at least a battery voltage and a battery current.

Optionally, in the process of charging the multiple strings of battery packs 217 through the first charge management chip 215, the first charge management chip 215 includes two charging modes: a boost (boost charge) mode and a buck (buck charge) mode.

The boost mode is realized by a boost converter, and is a single-tube non-isolated direct current converter with output voltage greater than input voltage, and the first charging management chip 215 realizes that the output voltage is greater than the input voltage through the boost converter; the buck mode is implemented by a buck converter, which is a single-tube non-isolated dc converter with an output voltage less than an input voltage, and the first charge management chip 215 implements the output voltage less than the input voltage through the buck converter.

If the input voltage of the first charge management chip 215 is less than the maximum voltage of the multi-string battery pack 217, the first charge management chip 215 charges the multi-string battery pack 217 in the boost mode when the battery voltage of the multi-string battery pack 217 does not reach the voltage threshold.

In an illustrative example, the input voltage of the first charge management chip 215 is 5V, the maximum voltage of the multi-string battery pack 217 is 8V, and since the input voltage of the first charge management chip 215 is less than the maximum voltage of the multi-string battery pack 217, the first charge management chip 215 charges the multi-string battery pack 217 in the boost mode when the battery voltage of the multi-string battery pack 217 does not reach the voltage threshold.

If the input voltage of the first charge management chip 215 is greater than the maximum voltage of the multi-string battery 217, the first charge management chip 215 charges the multi-string battery 217 in the buck mode when the battery voltage of the multi-string battery 217 reaches the voltage threshold.

In an illustrative example, the maximum voltage of the multi-string battery pack 217 is 8V, and the input voltage of the first charge management chip 215 is 12V, and since the input voltage of the first charge management chip 215 is greater than the maximum voltage of the multi-string battery pack 217, the first charge management chip 215 charges the multi-string battery pack 217 in the buck mode when the cell voltage of the multi-string battery pack 217 reaches the voltage threshold.

The processor 214 is further configured to control the second charging management chip 216 to charge the plurality of strings of battery packs 217 when the battery voltages of the plurality of strings of battery packs 217 reach the voltage threshold.

Optionally, the second charge management chip 216 includes at least two fixed charge modes, for example, when the second charge management chip 216 is an n:1 charge management chip, the second charge management chip 216 includes n charge modes, that is, the second charge management chip 216 can operate in a k:1 charge mode (k is 1,2, …, n).

In one illustrative example, the second charge management chip 216 is a 4:1 charge management chip, which indicates that the second charge management chip 216 can operate in a 1:1 charge mode, a 2:1 charge mode, a 3:1 charge mode, and a 4:1 charge mode.

The second charging management chip 216 is configured to perform fast charging on the multiple strings of battery packs 217, and during the fast charging, a charging mode of the second charging management chip 216 needs to be determined according to a charger parameter.

Optionally, the charger parameters include a maximum output voltage and a maximum output current of the charger. The processor 214 determines the k:1 charging mode as a target charging mode according to the battery voltage and the maximum output voltage in the charger parameters, and controls the second charging management chip 216 to charge the multi-string battery pack 217 in the target charging mode, wherein the maximum output voltage is greater than or equal to k times of the maximum voltage, and the output voltage of the second charging management chip 216 is 1/k of the input voltage in the k:1 charging mode.

In an illustrative example, the maximum output voltage in the charger parameter is 12V, and the maximum voltage of the multi-string battery pack 217 is 8V, and since the maximum output voltage is greater than 1 times the maximum voltage and less than 2 times the maximum voltage, the processor 214 determines the 1:1 charging mode as the target charging mode and controls the second charge management chip 216 to charge the multi-string battery pack 217 in the 1:1 charging mode.

In an illustrative example, the maximum output voltage in the charger parameter is 20V, and the maximum voltage of the multi-string battery pack 217 is 8V, and since the maximum output voltage is greater than 2 times the maximum voltage and less than 3 times the maximum voltage, the processor 214 determines the 2:1 charging mode as the target charging mode and controls the second charge management chip 216 to charge the multi-string battery pack 217 in the 2:1 charging mode.

Optionally, after the target charging mode is determined, the processor 214 instructs the wireless power transmitting device 10 to perform voltage regulation according to the target charging mode, and during the voltage regulation, the processor 214 sends a voltage regulation request to the wireless power transmitting device 10 through the first communication component 213 in an out-of-band communication mode.

Accordingly, at the wireless power transmitting device 10, the controller 204 receives the voltage-regulating request through the second communication component 203 and controls the charger step voltage regulation through the transmitter 202.

In one possible embodiment, the voltage regulation request is used to instruct the wireless power transmitting device 10 to regulate the output voltage of the charger to the target voltage, and accordingly, the controller 204 controls the charger to step and regulate the voltage according to the voltage regulation step size through the transmitter 202 according to the voltage regulation request, and finally regulates the voltage to the target voltage, so as to realize the response to the voltage regulation request. Wherein the target voltage is determined according to the k times maximum voltage and the loss compensation value.

In an illustrative example, the loss compensation value may include conversion losses of the inverter circuit, the power transmitting coil 201, the power receiving coil 211, and the rectifier circuit, and a specific loss compensation value may be obtained by testing an actual wireless power transmitting apparatus 10 and an actual wireless power receiving apparatus 11.

Optionally, in the process that the wireless power transmitting device 10 responds to the voltage regulation request, the wireless power receiving device 11 increases the output end current of the second charging management chip 216 to k times of the maximum output current of the charger for output.

In an illustrative example, the maximum voltage of the multi-string battery pack 217 is 8V, the loss compensation value is 20mV, and the processor 214 determines that the target charging mode of the second charge management chip 216 is the 2:1 charging mode, and determines that the target voltage is the sum of the maximum voltage multiplied by 2 and the loss compensation value, i.e., the target voltage is (16+0.02) V. The processor 214 transmits a voltage regulation request to the wireless power transmission apparatus 10 through the first communication component 213, the voltage regulation request instructing the wireless power transmission apparatus 10 to regulate the output voltage of the charger to 16.02V. The controller 204 at the wireless power transmitting device 10 controls the charger to step and regulate the voltage based on the current output voltage by taking 20mv as the voltage regulating step length until the regulated output voltage value is 16.02V.

Optionally, after the step voltage regulation is completed, the current at the output end of the second charging management chip 216 reaches k times of the maximum output current of the charger. For example, for a 20V/2A charger, after stepping voltage regulation is completed on a multi-string battery pack of 8V, the second charging management chip charges the multi-string battery pack with 8V charging voltage and 4A charging current, and the charging power is 32 w.

In one possible embodiment, the wireless power transmitting device 10 and the wireless power receiving device 11 can charge the multiple strings of battery packs 217 not only through a wireless charging manner, but also through a wired charging manner, for example, the wireless power receiving device 11 is plugged into a Universal Serial Bus (USB) data line for wired charging.

Illustratively, on the basis of fig. 2, as shown in fig. 3, the power receiving circuit 21 further includes a first switch 218 and a second switch 219, and the first switch 218 is connected to the receiver 212 and the first charge management chip 215, respectively.

When the wireless power receiving device 11 is charged in a wireless charging manner, the wireless power receiving device 11 is in a wireless charging state, at this time, the first switch 218 is in a closed state, the first switch 218 in the closed state controls the communication between the receiver 212 and the first charging management chip 215, and controls the communication between the receiver 212 and the second charging management chip 216; meanwhile, the second switch 219 is in an open state, and the second switch 219 in the open state controls the disconnection between the wired charging interface and the first charging management chip 215, and controls the disconnection between the wired charging interface and the second charging management chip 216.

When the wireless power receiving device 11 is charged in a wired charging manner, the wireless power receiving device 11 is in a wired charging state, at this time, the first switch 218 is in an open state, the first switch 218 in the open state controls the receiver 212 and the first charging management chip 215 to be disconnected, and controls the receiver 212 and the second charging management chip 216 to be disconnected; meanwhile, the second switch 219 is in a closed state, and the second switch 219 in the closed state controls the connection between the wired charging interface and the first charging management chip 215, and controls the connection between the wired charging interface and the second charging management chip 216.

As shown in fig. 2 and 3, the wireless charging management chip 216 operates in the 2:1 charging mode, and the charging power of the wireless charging management chip is 25W, for example, in the charging system formed by the power transmitting circuit 20 and the power receiving circuit 21, the charging efficiency is as follows.

Power transmission circuit 20: the efficiency of the power transmission coil 201 is about 95%, the loss of the inverter circuit is about 96.5%, and the overall efficiency of the power transmission circuit 20 is about 92.6%.

Power receiving circuit 21: the current of the power receiving coil 211 is reduced by increasing the output voltage of the rectifying circuit, so that the efficiency of the power receiving coil 211 and the rectifying circuit is improved, the efficiency of the power receiving coil 211 is about 97%, the efficiency of the rectifying circuit is about 97%, the efficiency of the second charge management chip 216 is about 98%, and the overall efficiency of the power receiving circuit 21 is about 92%. The overall efficiency of the power transmission circuit 20 and the power reception circuit 21 is about 85%.

In the embodiment of the application, compared with a wireless charging circuit under an LDO/Buck architecture in the related art, the wireless charging circuit controls the first charging management chip and the second charging management chip to charge the multiple strings of battery packs through the wireless power receiving device, and performs out-of-band communication through the first communication assembly and the second communication assembly, so that the problem that the charging power of wireless charging in the related art is limited can be solved; when the battery voltage of the battery packs of the plurality of strings is greater than the voltage threshold, the second charging management chip is controlled to charge the battery packs of the plurality of strings, and meanwhile, the output voltage of the charger is controlled according to the target voltage, so that accurate control can be performed on wireless charging, the wireless charging can be completed with high efficiency, and the wireless quick charging function is realized.

Referring to fig. 4, a flowchart of a wireless charging method according to an exemplary embodiment of the present disclosure is shown. In this embodiment, the method is described as an example when the method is used in the wireless charging system shown in fig. 1, and the method includes:

step 401, when the wireless power transmitting device is connected with the charger, the wireless power transmitting device obtains a charger parameter of the charger.

The charger connected to the wireless Power transmitting device may be a common DCP charger, a QC1.0 charger, a QC2.0 charger, a QC3.0 charger, a QC4.0 charger and the like based on a QC fast charging protocol, or a PD charger based on a Power Delivery (PD) fast charging protocol. The charger parameters corresponding to different types of chargers are different, and the charger parameters are used for indicating the charging capacity of the charger, including the maximum output voltage and the maximum output current.

Optionally, the wireless power transmitting device directly obtains the charger parameter of the charger, or determines the charger parameter according to the charger type of the charger.

Step 402, when the wireless power receiving device is located in the power transmission range of the wireless power transmitting device, performing fast charging authentication on the wireless power transmitting device.

In a possible implementation, the wireless power transmitting device may only support normal wireless charging but not wireless fast charging, and therefore when the wireless power receiving device is located in the power transmission range of the wireless power transmitting device, the wireless power receiving device needs to perform fast charging authentication on the wireless power transmitting device, and when the wireless power transmitting device passes the fast charging verification, step 403 is performed, where the communication mode of the fast charging authentication is an in-band communication mode.

Optionally, before the wireless power receiving device and the wireless power transmitting device perform the fast charging authentication, an in-band communication protocol of the Qi specification is further used for interaction.

Step 403, when the wireless power receiving device is located in the power transmission range and the wireless power transmitting device passes the fast charging authentication of the wireless power receiving device, the wireless power transmitting device establishes out-of-band communication with the wireless power receiving device.

In a possible implementation manner, when the wireless power transmitting device passes the fast charging authentication of the wireless power receiving device, the in-band communication protocol of the Qi specification is changed into a private protocol between the wireless power transmitting device and the wireless power transmitting device, and wireless communication is performed through an out-of-band communication mode, where the out-of-band communication mode may be at least one of bluetooth, NFC, and ZigBee.

Optionally, the private-protocol content may include a Configuration Packet (CP) under the Qi specification.

Step 404, if the wireless power transmitting device passes the fast charging authentication, the wireless power receiving device establishes an out-of-band communication with the wireless power transmitting device.

If the wireless power transmitting equipment does not pass the quick charging authentication, the wireless power transmitting equipment and the wireless power transmitting equipment continue to be wirelessly charged by an in-band communication protocol specified by Qi, and the wireless quick charging cannot be carried out; if the wireless power transmitting device passes the fast charge authentication, step 405 is executed.

In step 405, the wireless power transmitting device transmits the charger parameters to the wireless power receiving device via out-of-band communication.

In one possible implementation, the wireless power transmitting device packages the charger parameters into a CP, and transmits the CP containing the charger parameters to the wireless power receiving device by an out-of-band communication.

Optionally, the wireless power transmitting device transmits the charger parameter to the wireless power receiving device by also being able to communicate in-band.

In an illustrative example, the charger type is a QC2.0 charger, and then the charger parameters of QC2.0 include a maximum output voltage 12V and a maximum output current 1.5A, the wireless power transmitting device packages the maximum output voltage 12V and the maximum output current 1.5A into a CP for the QC2.0 charger, and transmits the CP to the wireless power receiving device through out-of-band communication.

In step 406, the wireless power receiving device receives the charger parameter sent by the wireless power sending device through out-of-band communication.

Optionally, the wireless power receiving device receives, through out-of-band communication, a CP sent by the wireless power sending device, where the CP contains the charger parameter.

Step 407, the wireless power receiving device charges the multiple strings of battery packs through the first charging management chip and the second charging management chip according to the charger parameters.

In one possible implementation, the charging mode for the multiple strings of battery packs comprises non-fast charging and fast charging. The first charging management chip is used for carrying out non-quick charging on the battery packs, the second charging management chip is used for carrying out quick charging on the battery packs, and the wireless power receiving equipment charges the battery packs through different charging management chips in different charging stages of wireless charging.

Optionally, during the wireless charging process, data communication is further performed between the wireless power receiving device and the wireless power transmitting device in an out-of-band communication manner, where the communication content includes but is not limited to: control Error Packet (CEP) information, and Power reception Packet (RPP) information.

To sum up, in the embodiment of the present application, when the wireless power receiving device is located in the power transmission range of the wireless power transmitting device, the wireless power receiving device performs fast charging authentication on the wireless power transmitting device, and establishes out-of-band communication with the wireless power transmitting device when the wireless power receiving device passes the fast charging authentication, so as to receive the charger parameter sent by the wireless power transmitting device through the out-of-band communication, and further charge the multiple strings of battery packs through the first charging management chip and the second charging management chip according to the charger parameter; because the second charging management chip can quickly charge and charge the battery packs, when the charger is indicated by the charger parameters to be a quick-charging charger, the wireless power receiving equipment can charge the battery packs by using the second charging management chip, so that the wireless charging efficiency is improved, and meanwhile, when the charger is indicated by the charger parameters to be a non-quick-charging device, the battery packs can still be charged through the first charging management chip, so that the application range of wireless charging is improved.

Please refer to fig. 5, which shows a flowchart of a wireless charging method according to another exemplary embodiment of the present application. In this embodiment, the method is described as an example when the method is used in the wireless charging system shown in fig. 1, and the method includes:

step 501, when the wireless power transmitting device is connected with a charger, the wireless power transmitting device obtains charger parameters of the charger.

The step 401 may be referred to in the implementation manner of this step, and this embodiment is not described herein again.

Step 502, when the wireless power receiving device is located in the power transmission range, the wireless power transmitting device transmits the fast charging authentication information to the wireless power receiving device through in-band communication.

In one possible implementation, a device built-in unified algorithm supporting wireless fast charging is provided. When the wireless power receiving equipment is located in the power transmission range, the wireless power receiving equipment sends a random number to the wireless power sending equipment, the wireless power sending equipment calculates the random number through a built-in algorithm to obtain a first calculation result, the first calculation result is packaged to generate the fast charging authentication information, and the fast charging authentication information is sent to the wireless power receiving equipment through in-band communication.

Step 503, the wireless power receiving device verifies the fast charging authentication information of the wireless power transmitting device.

In one possible implementation, the wireless power receiving device receives the fast charging authentication information through in-band communication, analyzes a first operation result from the fast charging authentication information, and compares the first operation result with a local second operation result (obtained by operating on a random number according to a local built-in algorithm). When the first operation result is the same as the second operation result, determining that the wireless power transmitting device passes the fast charging verification, and executing step 504; when the second result is different from the first result, the wireless power transmitting device fails to pass the verification of the wireless power receiving device, the wireless charging between the wireless power transmitting device and the wireless power transmitting device is continued by the in-band communication protocol of the Qi specification, and the charging cannot be performed by using the second charging management chip.

When the authentication of the wireless power reception apparatus is passed, the wireless power transmission apparatus establishes out-of-band communication with the wireless power reception apparatus, step 504.

Step 505, the wireless power transmitting device transmits the charger parameter to the wireless power receiving device via out-of-band communication.

In step 506, the wireless power receiving device receives the charger parameter sent by the wireless power sending device through out-of-band communication.

In step 507, the wireless power receiving device obtains battery voltages of the plurality of strings of battery packs.

In the embodiment of the application, the wireless power receiving equipment determines the current wireless charging stage by judging whether the battery voltage reaches the voltage threshold value, so that the corresponding charging management chip is selected to charge the multiple strings of battery packs, wherein the battery voltage is the current voltage of the multiple strings of battery packs. If the battery voltage does not reach the voltage threshold, go to step 508; if the battery voltage reaches the voltage threshold, step 509 is performed.

In the existing charging theory, three charging phases are involved: the charging stage that the voltage of the battery does not reach the voltage threshold value can be understood as the pre-charging stage, and the charging stage that the voltage of the battery reaches the voltage threshold value is understood as the quick charging stage corresponding to the embodiment of the application.

Step 508, if the battery voltage does not reach the voltage threshold, the wireless power receiving device charges the multiple strings of battery packs through the first charging management chip.

Optionally, when the wireless power receiving device charges the multiple strings of battery packs through the first charging management chip, the input voltage of the first charging management chip is further required to be compared with the maximum voltage of the multiple strings of battery packs, and the charging mode of the first charging management chip is selected according to the comparison result. In one possible embodiment, the step comprises the steps of:

if the input voltage of the first charging management chip is smaller than the maximum voltage of the multiple strings of battery packs, the wireless power receiving equipment charges the multiple strings of battery packs through the first charging management chip in the boosting mode when the battery voltage does not reach the voltage threshold value.

In one illustrative example, the charger type is a QC1.0 charger, and the input voltage to the first charge management chip is 5V (i.e., V for receiver 212 in FIG. 2) _out ) Since the input voltage of the first charge management chip is less than the maximum voltage of 8V of the plurality of strings of battery packs, the wireless power reception device charges the plurality of strings of battery packs through the first charge management chip in the boost mode.

When the battery voltage does not reach the voltage threshold value, the battery is in a pre-charging stage, and when the input voltage on one side of the first charging management chip is smaller than the maximum voltage of the plurality of strings of battery packs, the plurality of strings of battery packs can be charged by improving the output voltage on one side of the first charging management chip, so that the charging efficiency in the pre-charging stage is ensured.

And if the input voltage of the first charging management chip is greater than the maximum voltage of the plurality of strings of battery packs, the wireless power receiving equipment charges the plurality of strings of battery packs through the first charging management chip in the voltage reduction mode when the battery voltage does not reach the voltage threshold value.

When the input voltage at one side of the first charging management chip is greater than the maximum voltage of the plurality of strings of battery packs, the plurality of strings of battery packs may be damaged due to the excessive charging voltage, and under the condition, the plurality of strings of battery packs need to be charged by reducing the output voltage at one side of the first charging management chip, so that the charging safety at the pre-charging stage is ensured.

In an illustrative example, the charger type is QC2.0 charger, QC3.0 charger, QC4.0 charger or PD charger, the input voltage of the first charge management chip is 12V, and the wireless power reception device charges the multiple strings of battery packs through the first charge management chip in the buck mode since the input voltage of the first charge management chip is greater than the maximum voltage of the multiple strings of battery packs by 8V.

In step 509, if the battery voltage reaches the voltage threshold, the wireless power receiving device determines the target charging mode of the second charging management chip.

The method comprises the steps that when the voltage of a battery reaches a voltage threshold value, the battery is in a quick charging stage, when the wireless power receiving equipment is in the quick charging stage, the battery pack in the plurality of strings is charged through a second charging management chip, and the second charging management chip supports a plurality of charging modes, so that the wireless power receiving equipment needs to determine a target charging mode suitable for a current charger from the plurality of charging modes.

In one possible implementation, the second charge management chip is an n:1 charge management chip, and supports n charge modes from 1:1 to n: 1.

Optionally, the second charge management chip may operate in a k:1 charging mode (k ═ 1,2, …, n). And when the battery voltage reaches the voltage threshold value, determining the k:1 charging mode as a target charging mode according to the maximum voltage of the plurality of strings of battery packs and the maximum output voltage in the charger parameters.

In one possible implementation, the maximum output voltage in the charger parameters is used as a dividend, the maximum voltage of the multiple strings of battery packs is used as a divisor, an integer quotient k between the dividend and the divisor is obtained, and then the wireless power receiving device determines the k:1 charging mode as the target charging mode. And in the k:1 charging mode, the voltage of the output end of the second charging management chip is 1/k of the voltage of the input end. In an illustrative example, the charger type is QC3.0 charger, the charger parameters include maximum output voltage 12V and maximum output current 1.5A, the maximum voltage of the multiple strings of battery packs is 8V, the wireless power receiving device performs a division operation on 12V with respect to 8V to obtain an integer quotient 1, and k is 1, i.e., the maximum output voltage is greater than 1 times the maximum voltage and less than 2 times the maximum voltage, so that the wireless power receiving device determines the 1:1 charging mode as the target charging mode.

In an illustrative example, the charger type is a QC4.0 charger or a PD charger, the charger parameters include a maximum output voltage of 20V and a maximum output current of 2A, and the maximum voltage of the multiple strings of battery packs is 8V, the wireless power receiving device performs a division operation on the 20V with respect to the 8V to obtain an integer quotient 2, and k is 2, i.e., the maximum output voltage is greater than 2 times the maximum voltage and less than 3 times the maximum voltage, so that the wireless power receiving device determines the 2:1 charging mode as the target charging mode.

Step 510, the wireless power receiving device charges the battery packs through the second charging management chip in the target charging mode.

Optionally, in the process that the wireless power receiving device charges the multiple strings of battery packs through the second charging management chip in the target charging mode, the wireless power receiving device needs to send a voltage regulation request to the wireless power transmitting device, and the wireless power transmitting device receives and responds to the voltage regulation request. In one possible embodiment, the step comprises the steps of:

firstly, the wireless power receiving equipment sends a voltage regulating request to the wireless power sending equipment through out-of-band communication.

After the wireless power receiving equipment determines the k:1 charging mode as a target charging mode, the wireless power receiving equipment sends a voltage regulating request to the wireless power sending equipment to regulate the output voltage of the charger to a target voltage, and the target voltage is determined according to the maximum voltage of k times and the loss compensation value.

For example, the target voltage is k × maximum voltage + loss compensation value.

In one possible implementation, the wireless power receiving device packages the voltage regulation request to generate a CEP, and transmits the CEP to the wireless power transmitting device through out-of-band communication.

In one illustrative example, the charger type is a QC3.0 charger, the loss compensation value is 20mV, the charger parameters include a maximum output voltage of 12V and a maximum output current of 1.5A, the wireless power receiving device determines the 1:1 charging mode as a target charging mode, and the wireless power receiving device is requested to adjust the output voltage of the charger to the sum of 1 times the maximum voltage and the loss compensation value, i.e., the target voltage is (8+0.02) V.

In an illustrative example, the charger type is a QC4.0 charger or a PD charger, the loss compensation value is 20mV, the charger parameters include a maximum output voltage of 20V and a maximum output current of 2A, the wireless power receiving device determines the 2:1 charging mode as a target charging mode, and requests the wireless power receiving device to adjust the output voltage of the charger to the sum of 2 times the maximum voltage and the loss compensation value, i.e., the target voltage is (16+0.02) V.

And secondly, the wireless power transmitting equipment receives the voltage regulating request transmitted by the wireless power receiving equipment through out-of-band communication.

In one possible implementation, the wireless power transmits a CEP transmitted from the wireless power reception device via an out-of-band communication reception packet, and parses a voltage regulation request from the CEP.

And thirdly, the wireless power transmitting equipment controls the charger to regulate the voltage step by step according to the voltage regulation request.

In a possible implementation manner, the voltage regulation request is used to instruct the wireless power transmitting device to regulate the output voltage of the charger to the target voltage, and the wireless power transmitting device controls the charger to perform step voltage regulation according to the voltage regulation step size, and finally regulates the charger to the target voltage, so as to implement a response to the voltage regulation request, for example, the voltage regulation step size is 20 mv.

Optionally, in the process that the wireless power transmitting device responds to the voltage regulation request, the wireless power receiving device increases the output end current of the second charging management chip to k times of the maximum output current of the charger for output.

In an illustrative example, the charger type is QC3.0 charger, the loss compensation value is 20mV, the charger parameters include maximum output voltage 12V and maximum output current 1.5A, the wireless power receiving device determines the 1:1 charging mode as the target charging mode and requests the output voltage of the wireless power receiving device to be adjusted to the target voltage (8+0.02) V, and the wireless power transmitting device controls the charger to adjust the voltage step by step on the basis of the current output voltage by taking 20mV as a voltage adjusting step size until the output voltage value is adjusted to 8.02V. The current of the output end of the second charging management chip is 1 time of the maximum output current of the charger, namely the second charging management chip charges the multi-string battery pack by 8V charging voltage and 1.5A charging current.

In an illustrative example, the charger type is a QC4.0 charger or a PD charger, the loss compensation value is 20mV, the charger parameters include a maximum output voltage 20V and a maximum output current 2A, the wireless power receiving device determines the 2:1 charging mode as a target charging mode and requests the output voltage of the wireless power receiving device to be adjusted to a target voltage (16+0.02) V, and the wireless power transmitting device controls the charger to step and adjust the voltage based on the current output voltage until the output voltage value is adjusted to 16.02V, with 20mV as a voltage adjusting step size. The current of the output end of the second charging management chip is 2 times of the maximum output current of the charger, namely the second charging management chip charges the battery packs in a multi-string mode with 8V charging voltage and 4A charging current, and the charging power is 32 w.

In the embodiment of the application, the wireless power receiving equipment carries out fast charging authentication on the wireless power transmitting equipment through a built-in algorithm, and carries out data communication with the wireless power transmitting equipment in an out-of-band communication mode after passing the fast charging authentication, so that the communication quality in the wireless charging process is improved; in addition, in the process of charging the multiple strings of battery packs through the first charging management chip, the multiple strings of battery packs are charged in a boosting mode or a voltage reduction mode according to the input voltage of the first charging management chip and the maximum voltage of the multiple strings of battery packs, so that the safety of non-quick charging is ensured; in the process of charging the plurality of strings of battery packs through the second charging management chip, the target working mode is determined according to the charger parameters and the maximum voltage of the plurality of strings of battery packs, so that the plurality of strings of battery packs are quickly charged by using the second charging management chip in the target charging mode, and the efficiency and the power of wireless charging are improved.

It should be noted that, in the foregoing embodiments, the step that takes the wireless power transmitting device as an execution subject may be implemented as a wireless charging method on the side of the wireless power transmitting device, and the step that takes the wireless power receiving device as an execution subject may be implemented as a wireless charging method on the side of the wireless power receiving device, which is not described herein again.

Referring to fig. 6, a hardware block diagram of a mobile terminal 600 according to an exemplary embodiment of the present application is shown. The mobile terminal 600 may be implemented as a wireless power receiving device. The mobile terminal 600 in the present application may include one or more of the following components: processing component 602, memory 604, power component 606, multimedia component 608, audio component 610, input/output (I/O) interface 612, sensor component 614, and communication component 616.

The processing component 602 generally controls overall operation of the mobile terminal 600, such as operations associated with display, telephone calls, data communications, camera operations, and recording operations. The processing components 602 may include one or more processors 618 to execute instructions. Further, the processing component 602 can include one or more modules that facilitate interaction between the processing component 602 and other components. For example, the processing component 602 can include a multimedia module to facilitate interaction between the multimedia component 608 and the processing component 602.

The memory 604 is configured to store various types of data to support operation at the mobile terminal 600. Examples of such data include instructions for any application or method operating on the mobile terminal 600, contact data, phonebook data, messages, pictures, videos, and so forth. The memory 604 may be implemented by any type or combination of volatile or non-volatile memory devices such as Static Random Access Memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic or optical disks.

The power components 606 provide power to the various components of the mobile terminal 600. The power components 606 may include a power management system, one or more power supplies. The power components 606 may also include other components associated with generating, managing, and distributing power for the mobile terminal 600.

The multimedia component 608 includes a screen that provides an output interface between the mobile terminal 600 and the user. In some embodiments, the screen may include a Liquid Crystal Display (LCD) and a Touch Panel (TP). If the screen includes a touch panel, the screen may be implemented as a touch screen to receive an input signal from a user. The touch panel includes one or more touch sensors to sense touch, slide, and gestures on the touch panel. The touch sensor may not only sense the boundary of a touch or slide action, but also detect the duration and pressure associated with the touch or slide operation. The screen may also be a flexible display screen as provided in the above embodiments. In some embodiments, the multimedia component 608 includes a front facing camera and/or a rear facing camera. The front camera and/or the rear camera may receive external multimedia data when the terminal 600 is in an operation mode, such as a photographing mode or a video mode. Each front camera and rear camera may be a fixed optical lens system or have a focal length and optical zoom capability.

The audio component 610 is configured to output and/or input audio signals. For example, the audio component 610 may include a Microphone (MIC) configured to receive external audio signals when the mobile terminal 600 is in an operating mode, such as a call mode, a recording mode, and a voice recognition mode. The received audio signal may further be stored in the memory 604 or transmitted via the communication component 616. In some embodiments, audio component 610 further includes a speaker for outputting audio signals.

The I/O interface 612 provides an interface between the processing component 602 and peripheral interface modules, which may be keyboards, click wheels, buttons, etc. These buttons may include, but are not limited to: a home button, a volume button, a start button, and a lock button.

The sensor component 614 includes one or more sensors for providing various aspects of state assessment for the mobile terminal 600. For example, the sensor component 614 may detect an open/closed state of the mobile terminal 600; also for example, where the sensor component 614 is a display and keypad of the mobile terminal 600, the sensor component 614 may also detect changes in the position of the mobile terminal 600 or a component of the terminal, the presence or absence of user contact with the mobile terminal 600, orientation or acceleration/deceleration of the mobile terminal 600, and changes in the temperature of the mobile terminal 600. The sensor assembly 614 may include a proximity sensor configured to detect the presence of a nearby object without any physical contact. The sensor assembly 614 may also include a light sensor, such as a CMOS or CCD image sensor, for use in imaging applications. In some embodiments, the sensor assembly 614 may also include an acceleration sensor, a gyroscope sensor, a magnetic sensor, a pressure sensor, or a temperature sensor.

The communication component 616 is configured to facilitate communications between the mobile terminal 600 and other devices in a wired or wireless manner. The mobile terminal 600 may access a wireless network based on a communication standard, such as WiFi, or 2G, or 3G, or 1G, or 5G, or a combination thereof. In an exemplary embodiment, the communication component 616 receives broadcast signals or broadcast related information from an external broadcast management system via a broadcast channel. In an exemplary embodiment, the communication component 616 further includes a Near Field Communication (NFC) module to facilitate short-range communications.

In an exemplary embodiment, the mobile terminal 600 may be implemented by one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), Programmable Logic Devices (PLDs), Field Programmable Gate Arrays (FPGAs), controllers, micro-controllers, microprocessors, or other electronic components.

In an exemplary embodiment, a non-transitory computer readable storage medium is also provided, such as the memory 604 including instructions executable by the processor 618 of the mobile terminal 600 to control the telescoping mechanism to switch between the resting state, the outwardly extended state, and the inwardly retracted state. For example, the non-transitory computer readable storage medium may be a ROM, a Random Access Memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, and the like.

Those skilled in the art will recognize that, in one or more of the examples described above, the functions described in the embodiments of the present application may be implemented in hardware, software, firmware, or any combination thereof. When implemented in software, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A storage media may be any available media that can be accessed by a general purpose or special purpose computer.

The above description is only exemplary of the present application and should not be taken as limiting, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A wireless charging method, for a wireless power receiving device, the method comprising:

acquiring battery voltages of a plurality of strings of battery packs;

if the battery voltage does not reach the voltage threshold value, charging the multi-string battery pack through a first charging management chip, wherein the first charging management chip is used for performing non-fast charging on the multi-string battery pack;

if the battery voltage reaches the voltage threshold, determining a k:1 charging mode as a target charging mode of a second charging management chip according to the maximum voltage of the multiple strings of battery packs and the maximum output voltage in the charger parameters, wherein the maximum output voltage is greater than or equal to k times of the maximum voltage, the second charging management chip comprises at least two charging modes, and the second charging management chip is used for performing quick charging on the multiple strings of battery packs;

and charging the plurality of strings of battery packs through the second charging management chip in the target charging mode.

2. The method of claim 1, wherein the charging the plurality of strings of battery packs by the second charge management chip in the target charging mode comprises:

sending a voltage regulation request to the wireless power sending equipment through out-of-band communication, wherein the voltage regulation request is used for indicating the wireless power sending equipment to regulate output voltage to target voltage, the wireless power sending equipment is used for controlling the charger to regulate voltage in a stepping mode according to the voltage regulation request, and the target voltage is determined according to k times of the maximum voltage and a loss compensation value;

and charging the multi-string battery pack through the second charging management chip in the k:1 charging mode, wherein the output end voltage of the second charging management chip is 1/k of the input end voltage in the k:1 charging mode.

3. The method of claim 1, wherein the charging the plurality of strings of battery packs through the first charge management chip if the battery voltage does not reach a voltage threshold comprises:

if the input voltage of the first charging management chip is smaller than the maximum voltage of the multi-string battery pack, charging the multi-string battery pack through the first charging management chip in a boosting mode when the battery voltage does not reach the voltage threshold;

and if the input voltage of the first charging management chip is greater than the maximum voltage of the multiple strings of battery packs, charging the multiple strings of battery packs through the first charging management chip in a voltage reduction mode when the battery voltage does not reach the voltage threshold value.

4. The method according to any one of claims 1 to 3, wherein the performing fast-charge authentication on the wireless power transmitting device comprises:

receiving the quick charging authentication information sent by the wireless power sending equipment through in-band communication;

and verifying the quick charging authentication information of the wireless power transmitting equipment.

5. The method of any of claims 1 to 3, wherein after establishing the out-of-band communication with the wireless power transmitting device, the method further comprises:

when detecting that the wired charging interface is connected with the charger, disconnecting the out-of-band communication with the wireless power transmitting equipment, and acquiring the charger parameters of the charger through wired connection;

and charging the plurality of strings of battery packs through the first charging management chip and the second charging management chip according to the charger parameters.

6. A wireless charging method for a wireless power transmitting device, the method comprising:

the method comprises the steps that charger parameters are sent to the wireless power receiving equipment through out-of-band communication, the wireless power receiving equipment is used for determining a k:1 charging mode as a target charging mode of a second charging management chip according to the maximum voltage of a plurality of strings of battery packs and the maximum output voltage in the charger parameters when the battery voltage of the plurality of strings of battery packs reaches a voltage threshold, wherein the maximum output voltage is larger than or equal to k times of the maximum voltage, the second charging management chip comprises at least two charging modes, and the wireless power receiving equipment is used for carrying out quick charging on the plurality of strings of battery packs through the second charging management chip in the target charging mode.

7. The method of claim 6, wherein establishing out-of-band communication with a wireless power receiving device when the wireless power receiving device is within a power transfer range and passes a fast-charge authentication of the wireless power receiving device comprises:

when the wireless power receiving equipment is positioned in a power transmission range, transmitting fast charging authentication information to the wireless power transmitting equipment through in-band communication;

establishing an out-of-band communication with the wireless power receiving device when the authentication of the wireless power receiving device is passed.

8. The method of claim 6 or 7, wherein after the transmitting the charger parameters to the wireless power receiving device via out-of-band communication, the method further comprises:

receiving a voltage regulation request sent by the wireless power receiving equipment through out-of-band communication, wherein the voltage regulation request is used for indicating that the output voltage of the wireless power receiving equipment is regulated to a target voltage;

and controlling the step-by-step voltage regulation of the charger according to the voltage regulation request.

9. A power receiving circuit for a wireless power receiving device, the power receiving circuit comprising: the device comprises a power receiving coil, a receiver, a processor, a first charging management chip, a second charging management chip, a plurality of strings of battery packs and a first communication assembly;

the power receiving coil is connected with the receiver;

the receiver is respectively connected with the first charging management chip and the second charging management chip, the processor is connected with the receiver, and the processor is used for controlling and inputting the voltages of the first charging management chip and the second charging management chip through the receiver;

the processor is used for controlling the first charging management chip to charge the battery packs when the battery voltages of the battery packs do not reach a voltage threshold value;

when the battery voltage of the plurality of strings of battery packs reaches a voltage threshold value, controlling the second charging management chip to charge the plurality of strings of battery packs;

the processor is also connected with the first communication assembly and used for receiving charger parameters sent by the wireless power sending equipment through the first communication assembly and controlling the first charging management chip and the second charging management chip to charge the battery packs in series according to the charger parameters, wherein the charger parameters are used for indicating the charging capacity of the charger connected with the wireless power sending equipment;

the processor is further configured to determine a k:1 charging mode as a target charging mode according to the maximum voltage of the multiple strings of battery packs and the maximum output voltage in the charger parameter, and control the second charging management chip to charge the multiple strings of battery packs in the target charging mode, where the maximum output voltage is greater than or equal to k times the maximum voltage, and the second charging management chip includes at least two charging modes.

10. The power receiving circuit of claim 9,

the processor is further used for sending a voltage regulation request to the wireless power sending equipment through the first communication assembly, the voltage regulation request is used for indicating the wireless power sending equipment to regulate output voltage to target voltage, the wireless power sending equipment is used for controlling the charger to regulate voltage in a stepping mode according to the voltage regulation request, and the target voltage is determined according to k times of the maximum voltage and the loss compensation value.

11. The power receiving circuit of claim 9,

if the input voltage of the first charging management chip is less than the maximum voltage of the multiple strings of battery packs, the first charging management chip is used for charging the multiple strings of battery packs in a boosting mode when the battery voltage of the multiple strings of battery packs does not reach the voltage threshold value;

and if the input voltage of the first charging management chip is greater than the maximum voltage of the plurality of strings of battery packs, the first charging management chip is used for charging the plurality of strings of battery packs in a voltage reduction mode when the battery voltage of the plurality of strings of battery packs reaches the voltage threshold.

12. The power receiving circuit according to any one of claims 9 to 11, wherein the power receiving circuit further comprises a first switch and a second switch;

the first switch is used for controlling the communication between the receiver and the first charging management chip and controlling the communication between the receiver and the second charging management chip; the second switch is used for controlling the disconnection between the wired charging interface and the first charging management chip and controlling the disconnection between the wired charging interface and the second charging management chip;

the first switch is used for controlling the disconnection between the receiver and the first charging management chip and controlling the disconnection between the receiver and the second charging management chip; the second switch is used for controlling the wired charging interface to be communicated with the first charging management chip and controlling the wired charging interface to be communicated with the second charging management chip.

13. A power transmission circuit for a wireless power transmission device, the power transmission circuit comprising: a power transmitting coil, a transmitter, a controller, and a second communication assembly;

the controller is respectively connected with the second communication assembly and the transmitter, the controller is used for acquiring charger parameters of a charger through the transmitter and transmitting the charger parameters to the wireless power receiving equipment through the second communication assembly, the charger parameters are used for indicating the charging capacity of the charger connected with the wireless power transmitting equipment, the wireless power receiving equipment is used for determining a k:1 charging mode as a target charging mode of a second charging management chip according to the maximum voltage of a plurality of strings of battery packs and the maximum output voltage in the charger parameters when the battery voltage of the plurality of strings of battery packs reaches a voltage threshold value, wherein the maximum output voltage is greater than or equal to k times of the maximum voltage, the second charging management chip comprises at least two charging modes, and the wireless power receiving equipment is used for charging the battery packs through the second charging management chip in the target charging mode And the plurality of strings of battery packs are charged quickly, and the transmitter is connected with the charger.

14. The power transmitting circuit of claim 13,

the controller is further configured to receive, through the second communication component, a voltage regulation request sent by the wireless power receiving device, and control, through the transmitter, the charger to perform step voltage regulation, where the voltage regulation request is used to instruct to regulate the output voltage of the wireless power receiving device to a target voltage.

15. A wireless charging system, comprising: a wireless power transmitting device and a wireless power receiving device;

the wireless power transmitting device comprises the power transmitting circuit of any one of claims 13 to 14;

a power receiving circuit as claimed in any one of claims 9 to 12 in the wireless power receiving device.