WO2023123788A1

WO2023123788A1 - Wireless charging apparatus and method

Info

Publication number: WO2023123788A1
Application number: PCT/CN2022/090807
Authority: WO
Inventors: 吴鹏飞
Original assignee: 北京小米移动软件有限公司
Priority date: 2021-12-28
Filing date: 2022-04-29
Publication date: 2023-07-06
Also published as: CN116365722A

Abstract

The present application relates to the field of wireless charging. Disclosed are a wireless charging apparatus and method. The wireless charging apparatus comprises: a receiving coil, wherein the inductance of the receiving coil is less than the inductance of a transmitting coil; a receiving converter, which is connected to the receiving coil and is used for converting an alternating voltage of the receiving coil into an output voltage of the receiving converter, wherein the output voltage is a direct-current voltage; a charging converter, which is connected to the receiving converter and is used for converting the output voltage into a target voltage and then charging a battery; and a controller, which is connected to the receiving converter and the charging converter and is used for adjusting the output voltage of the receiving converter when the battery is charged in a second charging mode, such that the charging converter meets working requirements, wherein the second charging mode is a quick charging mode which satisfies a target private charging protocol.

Description

Wireless charging device and method

Cross References to Related Applications

This application is based on a Chinese patent application with application number 202111633588.0 and a filing date of December 28, 2021, and claims the priority of this Chinese patent application. The entire content of this Chinese patent application is hereby incorporated by reference into this application.

technical field

The present application relates to the field of wireless charging, in particular to a wireless charging device and method.

Background technique

At present, terminal equipment has become an indispensable part of people's daily life. Whether it is life or office, it plays a vital role, and terminal equipment needs to be charged frequently. Fast charging and wireless charging are used in the charging process of terminal equipment. played an important role in.

Contents of the invention

The present application provides a wireless charging device and method.

According to an aspect of the present application, a wireless charging device is provided, including:

A receiving coil, wherein the inductance of the receiving coil is smaller than the inductance of the transmitting coil;

A receiving converter connected to the receiving coil, the receiving converter is used to convert the AC voltage of the receiving coil into the output voltage of the receiving converter; the output voltage is a DC voltage;

a charging converter connected to the receiving converter, the charging converter is used to charge the battery after converting the output voltage into a target voltage;

a controller connected to the receiving converter and the charging converter, the controller is used to charge the receiving converter when controlling the charging converter to charge the battery in the second charging mode The output voltage of the charging converter is adjusted so that the charging converter meets the working requirements, wherein the second charging mode is a fast charging mode that meets the target private charging protocol.

According to the second aspect of the present application, there is provided a wireless charging method, which is applied to the wireless charging device described in the first aspect above, and the wireless charging method includes: when charging the battery in the second charging mode, charging The output voltage of the receiving converter is adjusted so that the charging converter meets working requirements, wherein the second charging mode is a fast charging mode meeting a target private charging protocol.

According to a third aspect of the present application, a terminal device is provided, including: the wireless charging method described in the aforementioned second aspect.

According to a fourth aspect of the present application, a terminal device is provided, including:

A memory, a processor, and a computer program stored on the memory and operable on the processor. When the processor executes the program, it can execute the wireless charging method described in the second aspect above.

According to a fourth aspect of the present application, a non-transitory computer-readable storage medium storing computer instructions is provided, including:

The computer instructions are used to enable the computer to execute the wireless charging method described in the aforementioned second aspect.

It should be understood that what is described in this section is not intended to identify key or important features of the embodiments of the application, nor is it intended to limit the scope of the application. Other features of the present application will be easily understood from the following description.

Description of drawings

The accompanying drawings are used to better understand the solution, and do not constitute a limitation to the application. in:

FIG. 1 is a structural block diagram of a wireless charging device provided by an embodiment of the present application;

FIG. 2 is a flow chart of a wireless charging method provided by an embodiment of the present application;

Fig. 3 is a flow chart of another wireless charging method provided by the embodiment of the present application;

Fig. 4 is a flow chart of another wireless charging method provided by the embodiment of the present application;

FIG. 5 is a structural block diagram of a terminal device provided in an embodiment of the present application;

FIG. 6 is a structural block diagram of a terminal device in a wireless charging method provided by an embodiment of the present application.

reference sign

1. Transmitting coil; 2. Receiving coil; 3. Receiving converter; 4. Charging converter; 5. Controller.

Detailed ways

Exemplary embodiments of the present application are described below in conjunction with the accompanying drawings, which include various details of the embodiments of the present application to facilitate understanding, and they should be regarded as exemplary only. Accordingly, those of ordinary skill in the art will recognize that various changes and modifications of the embodiments described herein can be made without departing from the scope and spirit of the application. Also, descriptions of well-known functions and constructions are omitted in the following description for clarity and conciseness.

It should be noted that in the process of wireless charging, terminal equipment mostly completes the charging operation by means of electromagnetic induction, which requires the use of sending coils and receiving coils to complete the mutual transformation of "electricity" and "magnetism". The receiving coils are all large induction coils. Due to the large impedance of the large induction coils, the heating phenomenon is serious during the wireless charging process, which causes the internal heating of the terminal device and affects the normal use of the terminal device.

Based on the above problems, this application proposes a wireless charging device and method. By changing the original large inductance coil to charge the large inductance coil and changing it to a large inductance coil to charge the small inductance coil, the large inductance coil has large impedance. , The problem of serious heating reduces the phenomenon of internal heating of the terminal device during the wireless charging process, ensuring that the normal use of the terminal device is not affected.

It should be noted that the wireless charging device in the embodiment of the present application is applied to a terminal device. Wherein, the terminal device may be a mobile phone, a tablet computer, a personal digital assistant, a wearable device, an augmented reality device, and other hardware devices with various operating systems. As an example, the terminal device may be a smart phone.

Among them, wireless charging is also called inductive charging and non-contact inductive charging. It originates from wireless power transmission technology and uses near-field induction, that is, inductive coupling. The device uses the energy it receives to charge the battery and at the same time use it for its own operation.

It should be noted that, as shown in FIG. 1, FIG. 1 is a structural block diagram of a wireless charging device provided in the embodiment of the present application. The wireless charging device includes a receiving coil 2, a receiving converter 3, a charging converter 4, and a controller 5. Wherein, the inductance of the receiving coil 2 is smaller than the inductance of the transmitting coil 1 .

Wherein, as shown in FIG. 1 , the receiving coil 2 is connected to a receiving converter 3 , and the receiving converter 3 is used to convert the AC voltage of the receiving coil 2 into an output voltage of the receiving converter 3 . It should be noted that the transmitting coil 1 is set in the wireless charging base for charging the wireless charging device or any other charging sending end for charging the wireless charging device, and there is no limitation. The transmitting coil 1 and the receiving coil 2 According to the electromagnetic induction, the mutual transformation of "electricity" and "magnetism" is completed, so as to realize the charging operation of the terminal equipment.

Wherein, receiving converter 3 is a kind of rectifier, is a kind of device that converts alternating current into direct current, can be used for power supply device and detection radio signal etc., in the embodiment of this application, receiving coil 2 sends to receiving converter 3 The voltage is an AC voltage, while the output voltage of the receiving converter 3 is a DC voltage.

It should be noted that in the process of wireless charging, the charging operation needs to be completed through the identification of high and low points, and the magnitude and direction of the AC voltage sent by the receiving coil 2 are periodically changed, resulting in the AC voltage sent by the receiving coil 2 There is no way to directly use it for wireless charging operation, and the direction of the DC voltage does not change with time, so it is necessary to convert the voltage sent by the receiving coil 2 to the receiving converter 3 into a DC voltage.

Wherein, as shown in FIG. 1 , the charging converter 4 is connected to the receiving converter 3 , and the charging converter 4 is used to charge the battery after converting the output voltage to a target voltage.

In the embodiment of the present application, the first charging mode is a normal charging mode that meets the target standard charging protocol, which can also be called the standard charging mode. It should be noted that when the terminal device performs charging operations in the standard charging mode, its principle It is to let the direct current pass through the opposite direction of discharge to restore the active material in the battery. When the terminal device is charged in the standard charging mode, the battery can be charged based on a power management IC (PMIC).

In the embodiment of the present application, the second charging mode is a fast charging mode (abbreviated as fast charging mode) that satisfies the target private charging protocol. The fast charging mode can indicate the charging mode when the fully charged state is restored in a relatively short period of time. It needs to be explained What is more interesting is that when the terminal equipment is charging in the fast charging mode, the battery receives electrical energy from the external circuit and converts it into the chemical energy of the battery; moreover, the charging efficiency of the fast charging mode is usually higher than that of the standard charging mode, and in The time required to fully charge the terminal device in the fast charging mode is less than the time required to fully charge the terminal device in the standard charging mode.

It should be noted that when charging a terminal device, the terminal device is the charging receiving end, and the charging protocol needs to be verified between the terminal device and the charging sending end, such as a public protocol (wireless charging standard protocol) and a private protocol (wireless charging fast charging protocol); in response to the verification of the public agreement between the terminal device and the charging sending end, but not the verification of the private agreement, the terminal device can only be charged in the first charging mode and cannot be charged in the second charging mode. Charging: In response to the verification that the public protocol and the private protocol are met between the terminal device and the charging sending end, the terminal device can charge in the first charging mode and in the second charging mode at this time.

Wherein, as shown in Figure 1, the controller 5 is connected with the receiving converter 3 and the charging converter 4, and the controller 5 is used to adjust the output voltage of the receiving converter 3 when charging the battery in the second charging mode , so that the charging converter 4 meets the working requirements.

In the embodiment of the present application, when charging the terminal device based on the fast charging mode, the controller 5 will control the charging converter 4 to charge the battery in the second charging mode, and will receive the output of the converter 3 The voltage is adjusted to ensure that the output voltage of the receiving converter 3 can meet the working requirements of the charging converter 4 .

In the embodiment of the present application, the controller 5 is also used to control the receiving converter 3 to start in the first working mode during the charging start-up stage, and control the receiving converter to switch over after the output voltage of the receiving converter 3 reaches the first voltage threshold. to the second working mode.

It should be noted that in the embodiment of the present application, since the inductance of the receiving coil 2 is smaller than the inductance of the transmitting coil 1, it is difficult to start the receiving coil 2 during the start-up phase. In order to ensure the normal operation of the receiving coil 2, the The receiving converter 3 is switched to the first working mode, and the receiving converter 3 is started in the first working mode to realize the start-up of the receiving coil 2, and then the charging protocol negotiation verification is performed, and after verification, the output voltage of the receiving converter 3 is adjusted , when the output voltage of the receiving converter 3 reaches the first voltage threshold, the receiving converter 3 is switched to the second working mode.

Wherein, in the embodiment of the present application, the first working mode is a half-bridge form, and the half-bridge form is a way in which two power switching devices are connected in the form of a totem pole, and the middle point is used as an output to provide a square wave signal. The second working mode is the full bridge form. The full bridge form is composed of four bridge arms. Each bridge arm is composed of a controllable switch tube and a diode connected in parallel. Every two bridge arms are connected in series, and then two bridge arms are connected in series. Then in parallel, the input end is connected to both ends of the series bridge arms, the output end is the midpoint of the two series bridge arms, and the load is connected between the midpoints of the two series bridge arms like a bridge. It should be noted that, when the current and the input voltage are the same, the output power of the half-bridge form is half that of the full-bridge form.

As an example, the first voltage threshold is preset to be 15V. When the transmitting coil 1 induces the receiving coil 2, in order to start the receiving coil 2, the rectifier bridge of the receiving converter 3 is first started in the form of a half bridge. After starting, it can be After the negotiation and verification of the charging protocol, the output voltage of the receiving converter 3 is adjusted, and when the output voltage of the receiving converter 3 reaches 15V, the rectifier bridge of the receiving converter 3 is adjusted to a full bridge form.

According to the wireless charging device of the embodiment of the present application, by setting the inductance of the receiving coil to be smaller than the inductance of the transmitting coil, the large inductance coil can be charged to the small inductance coil, which changes the original phenomenon that the large inductance coil charges the large inductance coil , from the purpose of reducing the heat generation by reducing the coil impedance, it ensures that the terminal device will not experience severe heat generation during the wireless charging process, reduces the internal heating phenomenon of the terminal device during the wireless charging process, and ensures that the terminal device The normal use of the wireless charging device is not affected, and through the adjustment operation of the controller, it is ensured that the switching operation between the standard charging mode and the fast charging mode can be performed, and the wireless charging device can adjust the charging mode according to the demand.

It should be noted that most of the current wireless fast charging devices use a 20V RX (charging receiver) output voltage, and the 20V voltage is converted into 5V by a 4:1 charge pump chip, so as to charge the battery with 5V, and the current TX ( The input voltage of the charging transmitter) may also be 20V, but when a 20V TX is paired with a small inductance receiving coil for wireless charging, the receiving converter 3 will not be able to generate an output voltage of 20V, and may only generate an output voltage of up to 16V, so There is no way to reach the 5V voltage to charge the battery, and the terminal equipment as the charging receiver will not be able to continue to use the previous 20V charging scheme; in order to allow the terminal equipment to continue to use the 20V charging scheme, through the receiving converter 3 Half-bridge form and full-bridge Form switching, specifically including:

In the embodiment of the present application, the charging converter 4 can be a charge pump, and the charging converter 4 can have a variety of working states with different conversion ratios, for example, the charge pump works in a 4:1 conversion ratio working state, wherein the charging converter The working requirement is that the output voltage of the charge pump is greater than 4 times of its input voltage.

It should be noted that the start-up condition (i.e., the working requirement) of the 4:1 charge pump is shown in formula (1), where formula (1) is as follows:

Vin＝4*Vout+delta; (1)

Among them, Vin is the input voltage of the 4:1 charge pump, Vout is the output voltage of the 4:1 charge pump, and delta is the variation.

It should be noted that, in the embodiment of the present application, the controller 5 can also control the output voltage of the receiving converter 3 to continuously increase when the charging converter is in the second charging mode and the charging converter is working at the working state of the first conversion ratio. High until the output voltage reaches the second voltage threshold, and after the output voltage reaches the second voltage threshold, switch to the first charging mode and charge the battery in the first charging mode, wherein the second voltage threshold is higher than the first voltage threshold.

For example, the first conversion ratio is a 4:1 conversion ratio without limitation.

Wherein, the second voltage threshold is the maximum value of the output voltage of the receiving converter 3, when the output voltage of the receiving converter 3 reaches the second voltage threshold, that is, the output voltage of the receiving converter 3 reaches the maximum value and cannot continue to rise, this When charging converter 4 also just can't continue to work with 4:1 working state.

In the embodiment of this application, as the charging process continues, the power supply of the terminal device increases, which leads to a continuous increase in the output voltage of the 4:1 charge pump, in order to meet the requirements of the 4:1 charge pump. In the starting condition, the input voltage of the 4:1 charge pump will also increase accordingly, but when the output voltage of the receiving converter 3 reaches the second voltage threshold, it means that the output voltage of the receiving converter 3 has reached the maximum value at this time. That is, the input voltage of the 4:1 charge pump cannot continue to increase, so the 4:1 charge pump cannot continue to operate normally, and then the 4:1 charge pump is turned off, and the battery cannot continue to be charged in the second charging mode. Switch to the first charging mode and charge the battery in the first charging mode, that is to say, exit the fast charging mode and continue charging the battery in the normal charging mode.

For example, in the process of wireless charging, the 4:1 charge pump has been activated at this time to realize the second charging mode to charge the battery. As the charging continues, the battery power continues to increase, and the 4:1 charge pump The output voltage Vout (Vbat) of the charge pump increases; in order to maintain the fast charge, the 4:1 charge pump input voltage Vin also needs to be passively increased to satisfy the relationship of Vin=4*Vout+delta; but when When the battery power of the terminal device reaches 50%, that is, the battery voltage (the output voltage of the 4:1 charge pump) also rises to a certain value. In order to maintain the normal operation of the 4:1 charge pump, it is necessary to continue to increase the receiving converter 3 However, when the output voltage of the receiving converter 3 reaches the second voltage threshold, it means that the output voltage of the receiving converter 3 has reached the maximum value, so the 4:1 charge pump cannot continue to operate normally, and then 4 : The charge pump of 1 is turned off, and it switches to normal charging mode for charging.

It should be noted that, in the embodiment of the present application, the controller 5 is further configured to control the output voltage to be less than the first voltage threshold after controlling the charging converter 4 to charge the battery in the first charging mode.

Optionally, control the receiving converter 3 to switch from the second working mode to the first working mode to increase the output voltage, and when the output voltage rises to meet the working requirements of the charging converter, control The charging converter charges the battery in the second charging mode.

In the embodiment of the present application, by controlling the output voltage of the charging converter 4, the receiving converter 3 is switched from the second working mode to the first working mode, and by switching the receiving converter 3 to the first working mode, the The increase of the output voltage of the receiving converter 3 is realized, so as to ensure that the working requirement of the 4:1 charge pump is met, and re-enter the fast charging mode.

For example, the first voltage threshold is preset to be 15V; when the receiving converter 3 fails to operate normally and the charging mode of the terminal equipment enters the normal charging mode, the output voltage of the receiving converter 3 is lowered to ensure the output voltage of the receiving converter 3 is less than 15V, at this time the rectifier bridge of the receiving converter 3 is switched from the full-bridge form to the half-bridge form, and the output voltage of the receiving converter 3 can continue to rise at this time, for example greater than 16V, and the output voltage of the receiving converter 3 can be It reaches 20V in the form of half bridge. At this time, the start-up condition of the 4:1 charge pump can be met. Restarting the 4:1 charge pump can switch the normal charging mode of the terminal device to the fast charging mode again.

According to the wireless charging device of the embodiment of the present application, by adding a 4:1 charge pump to ensure that the inductance of the receiving coil is smaller than the inductance of the transmitting coil, the fast charging operation is performed, which ensures that the charging efficiency of the terminal device is not affected, and By switching between the full bridge form and the half bridge form, it is ensured that the output voltage of the receiving converter can meet the start-up conditions of the 4:1 charge pump, ensure the smooth operation of the 4:1 charge pump, and ensure the fast charging of the terminal equipment mode works normally.

In some possible embodiments of the present application, when wireless charging is performed based on a small inductance receiving coil, in order not to affect the charging efficiency of the wireless charging device, a 10V charging scheme can be used instead of a 20V charging scheme, specifically including:

It should be noted that the charging converter 4 can also work in a working state with a conversion ratio of 2:1, wherein the working requirement of the charging converter 4 is that the output voltage of the charge pump is greater than twice its input voltage.

It should be noted that the start-up condition of the 2:1 charge pump is shown in formula (2), where formula (2) is as follows:

Vin＝2*Vout+delta； (2)

Among them, Vin is the input voltage of the 2:1 charge pump, Vout is the output voltage of the 2:1 charge pump, and delta is the variation.

It should be noted that the controller 5 is also used to control the charging converter 4 to operate in the second charging mode after controlling the receiving converter 3 to switch to the second working mode and the charging converter is working in the working state of the second conversion ratio. Charging the battery while boosting the output voltage of the receiving converter 3 , wherein the second conversion ratio is m:1, and m is a positive integer smaller than n.

For example, the second conversion ratio may be a 2:1 conversion ratio without limitation, and the value of m in the second conversion ratio is smaller than the value of n in the first conversion ratio.

It should be noted that when the transmitting coil 1 and the receiving coil 2 are inducted, in order to start the receiving coil 2, the rectifier bridge of the receiving converter 3 is first started in the form of a half bridge, and then the receiving converter 3 is adjusted by adjusting the output voltage of the receiving converter. The rectifier bridge of the converter 3 is adjusted to a full bridge form, and the 2:1 charge pump is turned on by adjusting the output voltage of the receiving converter 3, and the charging converter 4 is controlled to charge the battery in the second charging mode. As the output voltage of the receiving converter 3 continues to increase, it is ensured that the terminal equipment is continuously charged in the fast charging mode.

For example, when the transmitting coil 1 and the receiving coil 2 are inducted, in order to start the receiving coil 2, the rectifier bridge of the receiving converter 3 is started in the form of a half bridge. After starting, the wireless charging standard protocol and the target private charging protocol are executed. Verification, if the verification is completed, it is determined that the target private charging protocol is met, and it is determined that the transmitting end (TX) is a magnetic suction TX, then the output voltage of the receiving converter 3 can be adjusted, and the output voltage of the receiving converter 3 is adjusted to 13V, and the The rectifier bridge of the receiving converter 3 is switched to the full bridge form. After switching to the full bridge form, the output voltage of the receiving converter 3 is adjusted to 7V at this time, and the 2:1 charge pump is turned on. Based on the 2:1 charge pump The output voltage is converted and then output to the battery to charge the battery.

According to the wireless charging device of the embodiment of the present application, the 10V charging scheme can be used to replace the 20V charging scheme in the related art, which ensures that the charging efficiency of wireless fast charging is not affected by the small inductance receiving coil, and ensures that the terminal equipment is wirelessly charging. The charging efficiency will not be affected during the fast charging process, which ensures the normal operation of the fast charging mode of the terminal device.

The present application also proposes a wireless charging method, which can be applied to the wireless charging device in any of the above embodiments, as shown in Figure 2, which is a flow chart of a wireless charging method provided by the embodiment of the present application, The method includes the following step 201 .

Step 201 , when charging the battery in the second charging mode, adjust the output voltage of the receiving converter so that the charging converter meets the working requirements, wherein the second charging mode is a fast charging mode meeting the target private charging protocol.

It should be noted that, in the charging startup phase, the receiving converter is controlled to start in the first working mode, and the receiving converter is controlled to switch to the second working mode after the output voltage of the receiving converter reaches the first voltage threshold; wherein, the first The working mode is used to control the receiving converter to be in the form of half bridge, and the second working mode is used to control the receiving converter to be in the form of full bridge.

According to the wireless charging method of the embodiment of the present application, when the inductance of the receiving coil is smaller than the inductance of the transmitting coil, the switching operation between the standard charging mode and the fast charging mode is guaranteed through the adjustment operation of the controller, Ensure that the wireless charging device can adjust the charging mode according to the demand. It can realize the fast charging mode in the case of the small inductance receiving coil, improve the charging efficiency, and realize the large inductance coil charging the small inductance coil, which changes the original large inductance. The phenomenon that the coil is filled with a large inductance coil, from the purpose of reducing the heat generation by reducing the coil impedance, ensures that the terminal device will not experience serious heating during the wireless charging process, and reduces the internal temperature of the terminal device during the wireless charging process. The phenomenon of heating ensures that the normal use of the terminal equipment is not affected.

It should be noted that the receiving converter can complete the 20V charging scheme by switching the half-bridge mode, as shown in Figure 3, which is a flow chart of another wireless charging method provided by the embodiment of the present application, which includes the following steps 301 Go to step 304.

Step 301 , when charging the battery in the second charging mode, adjust the output voltage of the receiving converter so that the charging converter meets the working requirements, wherein the second charging mode is a fast charging mode meeting the target private charging protocol.

It should be noted that the charging converter works in the working state of the first conversion ratio, wherein the first conversion ratio is n:1.

Step 302, in the second charging mode, and when the charging converter is working in the working state of the first conversion ratio, control the output voltage of the receiving converter to rise until the output voltage reaches the second voltage threshold, and when the output voltage reaches the first After the second voltage threshold, switch to the first charging mode and charge the battery in the first charging mode, wherein the second voltage threshold is higher than the first voltage threshold, and the first charging mode is a normal charging mode that meets the target standard charging protocol.

Step 303, after the battery is charged in the first charging mode, the output voltage is controlled to be less than the first voltage threshold.

Step 304, control the charging converter to charge the battery in the first charging mode, control the receiving converter to switch from the second working mode to the first working mode to increase the output voltage, and when the output voltage rises to meet the charging When required by the operation of the converter, the charging converter is controlled to charge the battery in the second charging mode.

The wireless charging method of the embodiment of the present application is based on a 4:1 charge pump to ensure that the inductance of the receiving coil is smaller than the inductance of the transmitting coil to perform fast charging operations, ensuring that the charging efficiency of the terminal device is not affected, and through the full bridge The switching between the half-bridge mode and the half-bridge mode ensures that the output voltage of the receiving converter can meet the start-up conditions of the 4:1 charge pump, ensure the normal operation of the 4:1 charge pump, and ensure the normal operation of the fast charging mode of the terminal equipment, improving the charging efficiency.

It should be noted that the 10V charging scheme can also be used instead of the 20V charging scheme to ensure that the fast charging operation is performed when the inductance of the receiving coil is smaller than the inductance of the transmitting coil, as shown in Figure 4, which is provided by the embodiment of the present application. A flowchart of another wireless charging method, the method includes the following steps:

Step 401, when charging the battery in the second charging mode, adjust the output voltage of the receiving converter to make the charging converter meet the working requirements, wherein the second charging mode is a fast charging mode meeting the target private charging protocol.

It should be noted that the charging converter works in the working state of the second conversion ratio, wherein the second conversion ratio is m:1, and m is a positive integer smaller than n.

Step 402, when the receiving converter is controlled to switch to the second working mode, and the charging converter is working in the working state of the second conversion ratio, the charging converter is controlled to charge the battery in the second charging mode, and at the same time, the power of the receiving converter is increased. The output voltage.

According to the wireless charging method of the embodiment of the present application, the second conversion ratio can be 2:1, so that a 10V charging scheme can be adopted, which ensures that the charging efficiency of wireless fast charging is not affected by the small inductance receiving coil, and ensures that the terminal device is The charging efficiency will not be affected during the wireless fast charging process, which ensures the normal operation of the fast charging mode of the terminal device.

In the following, the wireless charging method in the embodiment of the present application will be briefly described in combination with specific implementation methods, in the scenario of a receiving coil with a small inductance.

In some embodiments, 1) the receiving converter is started in the form of a half-bridge. After starting, the wireless charging standard protocol and the target private charging protocol are executed, and the charging protocol is negotiated and verified between the charging sending end and the charging receiving end. After the protocol is completed, the output voltage of the receiving converter is adjusted to a first voltage threshold, for example, the first voltage threshold is 15V, and the receiving converter is switched to a full-bridge form.

Wherein, the first voltage threshold can be determined according to the charging protocol, for example, if it is determined that the target private charging protocol is met, charging can be performed in a fast charging mode, and the voltage can be adjusted to 15V.

2) After switching to the full bridge mode, re-adjust the voltage to 15V, start a 4:1 charging converter, such as a 4:1 charge pump, and charge in the fast charging mode at this time. As the charging progresses, the battery power increases, 4 The output voltage of the :1 charge pump increases, and in order to ensure the fast charging mode, the input voltage of the 4:1 charge pump also needs to be passively increased.

When the battery power reaches a certain value, that is, the output voltage of the 4:1 charge pump also rises to a certain value. In order to ensure the fast charging mode, it is necessary to further increase the output voltage of the receiving converter, but at this time the output voltage has reached the maximum value. , that is, the second voltage threshold, so the 4:1 charge pump will not continue to work, and will exit the fast charging mode and enter the normal charging mode.

3) After switching to the normal charging mode, the output voltage of the receiving converter will be lowered to below 15V, and the receiving converter can be switched to the half-bridge mode to increase the output voltage. In the half-bridge mode, the output voltage will increase. When the working requirements of the 4:1 charge pump are reached, the 4:1 charge pump can be turned on again to continue charging in the fast charging mode.

In some embodiments, 1) the receiving converter is started in the form of a half-bridge. After starting, the wireless charging standard protocol and the target private charging protocol are executed, and the charging protocol is negotiated and verified between the charging sending end and the charging receiving end. After the protocol is completed, the output voltage of the receiving converter is adjusted to the first voltage threshold, for example, the first voltage threshold is 13V, and the receiving converter is switched to a full-bridge form.

Wherein, the first voltage threshold can be determined according to the charging protocol. For example, it is determined that the target private charging protocol is met, and the charging sending end has a magnet. For the magnetic charging sending end that supports the target private charging protocol, the magnetic charging wireless charging device can be used. The corresponding fast charging mode is used for charging, and the voltage can be adjusted to 13V.

2) After switching to the full bridge form, re-regulate the voltage to 7V (can be determined based on the conversion ratio of the charge converter), and start a 2:1 charge converter, such as a 2:1 charge pump, which can be based on a 2:1 charge The pump charges in fast charge mode.

In order to implement the foregoing embodiments, the present application also proposes a terminal device.

FIG. 5 is a structural block diagram of a terminal device provided in an embodiment of the present application.

As shown in FIG. 5 , the terminal device 500 may include: a wireless charging device 501 . For the description of the function and structure of the wireless charging device 501 , reference may be made to the description of the function and structure of the wireless charging device in any of the above embodiments of the present application, which will not be repeated here.

Fig. 6 is a block diagram showing a terminal device 600 according to an exemplary embodiment. For example, the terminal device 600 may be a mobile phone, a computer, a digital broadcast terminal, a messaging device, a game console, a tablet device, a medical device, a fitness device, a personal digital assistant, and the like.

6, terminal device 600 may include one or more of the following components: processing component 602, memory 604, power supply component 606, multimedia component 608, audio component 66, input/output (I/O) interface 612, sensor component 614 , and the communication component 616.

The processing component 602 generally controls the overall operations of the terminal device 600, such as operations associated with display, telephone calls, data communication, camera operations, and recording operations. The processing component 602 may include one or more processors 620 to execute instructions to complete all or part of the steps of the above method. Additionally, processing component 602 may include one or more modules that facilitate interaction between processing component 602 and other components. For example, processing component 602 may include a multimedia module to facilitate interaction between multimedia component 608 and processing component 602.

The memory 604 is configured to store various types of data to support operations at the terminal device 600 . Examples of such data include instructions for any application or method operating on the terminal device 600, contact data, phonebook data, messages, pictures, videos, and the like. The memory 604 can be implemented by any type of volatile or non-volatile storage device or their combination, 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 Disk.

The power supply component 606 provides power to various components of the terminal device 600 . Power components 606 may include a power management system, one or more power supplies, and other components associated with generating, managing, and distributing power for end device 600 .

The multimedia component 608 includes a touch display screen providing an output interface between the terminal device 600 and the user. In some embodiments, the touch display may include a liquid crystal display (LCD) and a touch panel (TP). The touch panel includes one or more touch sensors to sense touches, swipes, and gestures on the touch panel. The touch sensor may not only sense a boundary of a touch or a swipe action, but also detect duration and pressure associated with the touch or swipe operation. In some embodiments, the multimedia component 608 includes a front camera and/or a rear camera. When the terminal device 600 is in an operation mode, such as a shooting mode or a video mode, the front camera and/or the rear camera can receive external multimedia data. Each front camera and rear camera can be a fixed optical lens system or have focal length and optical zoom capability.

Audio component 66 is configured to output and/or input audio signals. For example, the audio component 66 includes a microphone (MIC), which is configured to receive an external audio signal when the terminal device 600 is in an operation mode, such as a calling mode, a recording mode and a voice recognition mode. Received audio signals may be further stored in memory 604 or sent via communication component 616 . In some embodiments, the audio component 66 also includes a speaker for outputting audio signals.

The I/O interface 612 provides an interface between the processing component 602 and a peripheral interface module. The peripheral interface module may be a keyboard, a click wheel, a button, and the like. These buttons may include, but are not limited to: a home button, volume buttons, start button, and lock button.

The sensor component 614 includes one or more sensors for providing status assessments of various aspects of the terminal device 600 . For example, the sensor component 614 can detect the opening/closing state of the terminal device 600, the relative positioning of the components, for example, the components are the display and the keypad of the terminal device 600, and the sensor component 614 can also detect the terminal device 600 or a component of the terminal device 600. Changes in position, presence or absence of user contact with the terminal device 600 , orientation or acceleration/deceleration of the terminal device 600 and temperature changes of the terminal device 600 . The sensor assembly 614 may include a proximity sensor configured to detect the presence of nearby objects in the absence of any physical contact. Sensor assembly 614 may also include optical sensors, such as CMOS or CCD image sensors, for use in imaging applications. In some embodiments, the sensor component 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 wired or wireless communication between the terminal device 600 and other devices. The terminal device 600 can access a wireless network based on communication standards, such as WiFi, 2G or 3G, 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 also includes a near field communication (NFC) module to facilitate short-range communication. For example, the NFC module may be implemented based on Radio Frequency Identification (RFID) technology, Infrared Data Association (IrDA) technology, Ultra Wideband (UWB) technology, Bluetooth (BT) technology and other technologies.

In an exemplary embodiment, the terminal device 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 A programmable gate array (FPGA), controller, microcontroller, microprocessor or other electronic component implementation for performing the wireless charging method described above.

In an exemplary embodiment, there is also provided a non-transitory computer-readable storage medium including instructions, such as a memory 604 including instructions, which can be executed by the processor 620 of the terminal device 600 to complete the above method. For example, the non-transitory computer readable storage medium may be ROM, random access memory (RAM), CD-ROM, magnetic tape, floppy disk, optical data storage device, and the like.

A non-transitory computer-readable storage medium, when the instructions in the storage medium are executed by the processor of the terminal device 600, the terminal device 600 can execute a wireless charging method.

According to the technical solution of the embodiment of the present application, by setting the inductance of the receiving coil to be smaller than the inductance of the transmitting coil; thereby realizing the large inductance coil charging the small inductance coil, changing the original phenomenon that the large inductance coil is charged with the large inductance coil, From the purpose of reducing the heat generation by reducing the coil impedance, it is ensured that the terminal device will not experience severe heat generation during the wireless charging process, reducing the internal heating phenomenon of the terminal device during the wireless charging process, and ensuring the safety of the terminal device. Normal use is not affected, and through the adjustment operation of the controller, it is guaranteed to be able to switch between the standard charging mode and the fast charging mode, and to ensure that the wireless charging device can adjust the charging mode according to the demand.

It should be understood that steps may be reordered, added or deleted using the various forms of flow shown above. For example, the steps described in the present application may be executed in parallel, sequentially, or in a different order, as long as the desired result of the technical solution disclosed in the present application can be achieved, no limitation is imposed herein.

The above specific implementation methods are not intended to limit the protection scope of the present application. It should be apparent to those skilled in the art that various modifications, combinations, sub-combinations and substitutions may be made depending on design requirements and other factors. Any modifications, equivalent replacements and improvements made within the spirit and principles of this application shall be included within the protection scope of this application.

Claims

A wireless charging device, characterized in that it comprises:

A receiving coil, wherein the inductance of the receiving coil is smaller than the inductance of the transmitting coil;

A receiving converter connected to the receiving coil, the receiving converter is used to convert the AC voltage of the receiving coil into the output voltage of the receiving converter; the output voltage is a DC voltage;

a charging converter connected to the receiving converter, the charging converter is used to charge the battery after converting the output voltage into a target voltage;

A controller connected to the receiving converter and the charging converter, the controller is used to adjust the output voltage of the receiving converter when charging the battery in the second charging mode, so that all The charging converter meets the working requirements, wherein the second charging mode is a fast charging mode meeting the target private charging protocol.
The wireless charging device according to claim 1, wherein the controller is further configured to control the receiving converter to start in the first working mode during the charging startup phase until the output voltage of the receiving converter After reaching the first voltage threshold, control the receiving converter to switch to a second working mode; wherein the first working mode is used to control the receiving converter to be in the form of a half-bridge, and the second working mode is used to control The receive converter is in the form of a full bridge.
The wireless charging device according to claim 1 or 2, wherein the charging converter works in a working state of a first conversion ratio, wherein the first conversion ratio is n:1.
The wireless charging device according to claim 3, wherein the controller is further configured to control The output voltage of the receiving converter is increased until the output voltage reaches a second voltage threshold, and after the output voltage reaches the second voltage threshold, switching to a first charging mode and charging with the first mode to charge the battery, wherein the second voltage threshold is higher than the first voltage threshold, and the first charging mode is a normal charging mode meeting a target standard charging protocol.
The wireless charging device according to claim 4, wherein the controller is further configured to control the output voltage to be less than the first voltage after charging the battery in the first charging mode threshold.
The wireless charging device according to claim 4, wherein the controller is further configured to control the receiving converter from the second charging mode after the battery is charged in the first charging mode. The working mode is switched to the first working mode to increase the output voltage, and when the output voltage rises to meet the working requirements of the charging converter, control the charging converter to operate in the second The charging mode charges the battery.
The wireless charging device according to claim 1 or 2, characterized in that, the charging converter works in the working state of the second conversion ratio, wherein the second conversion ratio is m:1, and m is less than n positive integer.
The wireless charging device according to claim 7, wherein the controller is specifically configured to control the receiving converter to switch to the second working mode, and the charging converter works in the second switching mode In the working state of the ratio, the charging converter is controlled to charge the battery in the second charging mode, and at the same time, the output voltage of the receiving converter is increased.
A wireless charging method, applied to the wireless charging device according to any one of claims 1 to 8, characterized in that the method comprises:

When charging the battery in the second charging mode, the output voltage of the receiving converter is adjusted so that the charging converter meets the working requirements, wherein the second charging mode is to meet the target private charging protocol fast charging mode.
The method of claim 9, further comprising:

In the charging startup phase, control the receiving converter to start in the first working mode, and control the receiving converter to switch to the second working mode after the output voltage of the receiving converter reaches the first voltage threshold; wherein, the The first working mode is used to control the receiving converter to be in the form of half bridge, and the second working mode is used to control the receiving converter to be in the form of full bridge.
The method according to claim 9 or 10, further comprising:

In the second charging mode, and the charging converter is working in the working state of the first conversion ratio, the output voltage of the receiving converter is controlled to continue to increase until the output voltage reaches the second voltage threshold, and at After the output voltage reaches the second voltage threshold, switch to a first charging mode and charge the battery in the first charging mode, wherein the second voltage threshold is higher than the first voltage threshold , the first charging mode is a normal charging mode meeting the target standard charging protocol, and the first conversion ratio is n:1.
The method of claim 11, further comprising:

After the battery is charged in the first charging mode, the output voltage is controlled to be less than the first voltage threshold.
The method of claim 11, further comprising:

After charging the battery in the first charging mode, controlling the receiving converter to switch from the second working mode to the first working mode to increase the output voltage, and in the When the output voltage increases to meet the working requirements of the charging converter, the charging converter is controlled to charge the battery in the second charging mode.
The method according to claim 9 or 10, further comprising:

After controlling the receiving converter to switch to the second working mode, and the charge pump is working in the working state of the second conversion ratio, controlling the charging converter to charge the battery in the second charging mode Charging is performed while increasing the output voltage of the receiving converter, the second conversion ratio is m:1, and m is a positive integer smaller than n.
A terminal device, characterized in that it includes:

The wireless charging device according to any one of claims 9 to 14.
A terminal device, characterized in that it comprises: a memory, a processor, and a computer program stored on the memory and operable on the processor, when the processor executes the program, any of claims 9 to 14 can be realized A wireless charging method described above.
A non-transitory computer-readable storage medium storing computer instructions, wherein the computer instructions are used to make the computer execute the wireless charging method described in any one of 9 to 14.