WO2020140282A1

WO2020140282A1 - Charging circuit and wireless charging control method

Info

Publication number: WO2020140282A1
Application number: PCT/CN2019/070467
Authority: WO
Inventors: 郑志勇
Original assignee: 华为技术有限公司
Priority date: 2019-01-04
Filing date: 2019-01-04
Publication date: 2020-07-09
Also published as: CN112655132A

Abstract

An embodiment of the present application discloses a charging circuit, relating to the technical field of power supply, and resolving the issues of excessive temperatures, slow charging, and a poor user experience during wireless charging of a terminal in the prior art. A specific solution is as follows: an input end of a rectifier filter module is connected to a coil; an input end of a first switched-capacitor module is connected to an output end of the rectifier filter module; an output end of the first switched-capacitor module is connected to an input end of a second switched-capacitor module; an output end of the second switched-capacitor module is connected to a battery module of a terminal. The coil is used to sense an external magnetic field and to generate an induced voltage. The rectifier filter module is used to rectify the induced voltage to a direct current output voltage. The first switched-capacitor module is used to receive a first control signal and convert the direct current output voltage to a first output voltage. The second switched-capacitor module is used to receive a second control signal and convert the first output voltage to a second output voltage. The second output voltage is used to supply power to the battery module.

Description

Charging circuit and wireless charging control method

Technical field

Embodiments of the present application relate to the field of charging technology, and in particular, to a charging circuit and a wireless charging control method.

Background technique

With the wide application of smart phones, the convenience and versatility of mobile phone charging are more and more valued by users. In order to facilitate user charging, wireless charging technology came into being. The existing terminal wireless charging device mainly includes a power adapter, a wireless base, and three modules of the terminal. As shown in FIG. 1, the wireless base provides an input voltage, and a relatively fixed receiving end (Receive, RX) is obtained through the terminal side coil coupling and filtering ) The output voltage and RX output voltage charge the battery module through a step-down conversion buck circuit. Since the efficiency of the buck circuit is only about 90%, the lower conversion efficiency causes the mobile phone to generate severe heat, the charging speed is slow, and the user experience is poor.

Summary of the invention

The embodiments of the present application provide a charging circuit and a wireless charging control method, which can improve the conversion efficiency of the terminal, the charging speed is faster, and the loss is lower.

To achieve the above purpose, the embodiments of the present application adopt the following technical solutions:

According to a first aspect of the embodiments of the present application, a charging circuit is provided. The charging circuit includes a coil, a rectifier filter module, a first switched capacitor module, and a second switched capacitor module. The input terminal of the rectifier filter module is connected to the coil. The input terminal of a switched capacitor module is connected to the output terminal of the rectifier filter module, the output terminal of the first switched capacitor module is connected to the input terminal of the second switched capacitor module, and the output terminal of the second switched capacitor module is used to connect the terminal A battery module, wherein the coil is used to induce an external magnetic field to generate an induced voltage; the rectifier filter module is used to rectify the induced voltage into a DC output voltage; and the first switched capacitor module is used to receive a first control signal, Convert the DC output voltage to a first output voltage; the first output voltage is 1/2 of the DC output voltage; the second switched capacitor module is used to receive a second control signal and convert the first output voltage to The second output voltage; the second output voltage is 1/2 of the first output voltage, and the second output voltage is used to supply power to the battery module. Based on this solution, the charging circuit can realize the output voltage of the charging circuit is reduced to 1/4 of the input voltage through two switched capacitor modules, and when the high-efficiency switched capacitor module is used for voltage reduction, the loss of the charging circuit is reduced and the charging heating can be Get effective control.

With reference to the first aspect, in a possible implementation manner, the first control signal includes a third control signal, a fourth control signal, a fifth control signal, and a sixth control signal, and the first switched capacitor module includes: a first A switch, a second switch, a third switch, a fourth switch, a first capacitor, a second capacitor, and a third capacitor; the first end of the first switch is the input end of the first switched capacitor module, and the The first end is connected to one end of the third capacitor, the other end of the third capacitor is connected to the ground, and the second end of the first switch is connected to the first end of the second switch and one end of the first capacitor; the second The second end of the switch is the output end of the first switched capacitor module, and the second end of the second switch is connected to the first end of the third switch and one end of the second capacitor, and the other end of the second capacitor is connected Ground terminal; the second terminal of the third switch is connected to the other terminal of the first capacitor and the first terminal of the fourth switch, the second terminal of the fourth switch is connected to the ground terminal; the control terminal of the first switch inputs the above For the third control signal, the control terminal of the second switch inputs the fourth control signal, the control terminal of the third switch inputs the fifth control signal, and the control terminal of the fourth switch inputs the sixth control signal. Based on this solution, the first switched capacitor module can achieve efficient voltage reduction.

With reference to the first aspect and the foregoing possible implementation manner, in another possible implementation manner, the second control signal includes a seventh control signal, an eighth control signal, a ninth control signal, and a tenth control signal, and the second switch The capacitor module includes: a fifth switch, a sixth switch, a seventh switch, an eighth switch, a fourth capacitor, a fifth capacitor, and a sixth capacitor; the first terminal of the fifth switch is the input terminal of the second switched capacitor module , The first end of the fifth switch is connected to one end of the sixth capacitor, the other end of the sixth capacitor is connected to the ground, and the second end of the fifth switch is connected to the first end of the sixth switch and the fourth capacitor One end of the sixth switch; the second end of the sixth switch is the output end of the second switched capacitor module, the second end of the sixth switch is connected to the first end of the seventh switch and the end of the fifth capacitor, the fifth The other end of the capacitor is connected to the ground; the second end of the seventh switch is connected to the other end of the fourth capacitor and the first end of the eighth switch, and the second end of the eighth switch is connected to the ground; the fifth switch The control terminal of the input of the seventh control signal, the control terminal of the sixth switch inputs the eighth control signal, the control terminal of the seventh switch inputs the ninth control signal, the control terminal of the eighth switch inputs the tenth control signal. Based on this solution, the second switched capacitor module can achieve efficient voltage reduction.

With reference to the first aspect and the foregoing possible implementation manner, in another possible implementation manner, if the first output voltage is 1/2 of the DC output voltage, the third control signal and the fifth control signal are the same, The fourth control signal is the same as the sixth control signal, and the duty ratios of the third control signal and the fourth control signal are both preset ratios and have complementary waveforms. Based on this solution, the first switched capacitor module can achieve a 2:1 relationship between input voltage and output voltage.

With reference to the first aspect and the foregoing possible implementation manner, in another possible implementation manner, if the second output voltage is 1/2 of the first output voltage, the seventh control signal and the ninth control signal are the same The eighth control signal is the same as the tenth control signal, and the duty ratios of the seventh control signal and the eighth control signal are the preset ratio and the waveforms are complementary. Based on this solution, the second switched capacitor module can achieve a 2:1 relationship between input voltage and output voltage.

A second aspect of an embodiment of the present application provides a wireless charging circuit. The wireless charging circuit includes a boost module, a buck module, and a pass-through module. The boost module, the buck module, and the pass-through module are connected in parallel. The module is used to receive the first AC signal and convert the input voltage of the wireless charging circuit into a first output voltage, the first output voltage is higher than the input voltage; the step-down module is used to receive the second AC signal, The input voltage of the wireless charging circuit is converted into a second output voltage which is lower than the input voltage; the pass-through module is used to receive a third AC signal and convert the input voltage of the wireless charging circuit into a third output Voltage, the third output voltage is equal to the above input voltage. Based on this solution, the output voltage of the wireless base can be finely adjusted by the booster module or the buck module in the wireless charging circuit.

With reference to the second aspect, in a possible implementation manner, the step-up module is a step-up boost circuit, the step-down module is a buck circuit, and the pass-through module is a pass-through circuit. Based on this solution, the output voltage of the wireless base can be adjusted through a boost circuit, a buck circuit, or a through circuit.

According to a third aspect of the embodiments of the present application, a wireless charging control method is provided. The method includes: acquiring a battery voltage of a battery module of a terminal, the battery module including one or more batteries; and determining a reference voltage according to the above battery voltage, the reference The voltage value is N times the above battery voltage value, N is greater than or equal to 1; send a first AC signal to the wireless charging device, the first AC signal is used to instruct the wireless charging device to adjust the output voltage of the wireless charging device to The above reference voltage; send a first control signal to the first switched capacitor module, the first control signal is used to instruct the first switched capacitor module to convert its input voltage to a first output voltage; send a second to the second switched capacitor module A control signal, the second control signal is used to instruct the second switched capacitor module to convert the first output voltage to a second output voltage, the second output voltage value is 1/N of the reference voltage value, and the second output The voltage is used to power the above battery module. Based on this solution, by increasing the output voltage of the wireless charging device and stepping down the voltage through two switched capacitor modules, the output power of wireless charging is greatly increased, so that the charging current becomes larger and the charging speed is faster; and because the switched capacitor module decreases The loss of voltage is low, so the heating of charging can be effectively controlled, and the user experience is better.

With reference to the third aspect, in a possible implementation, if the reference voltage is 4 times the battery voltage, the first output voltage is 1/2 of the input voltage, and the second output voltage is the first output voltage If the reference voltage is twice the battery voltage, the first output voltage is equal to the input voltage, and the second output voltage is 1/2 of the first output voltage. Based on this solution, a 2:1 or 4:1 relationship between input voltage and output voltage can be achieved.

With reference to the third aspect and the foregoing possible implementation manner, in another possible implementation manner, in the case where the battery module includes multiple batteries, if the reference voltage is equal to the battery voltage, the first output voltage is The input voltages are equal, and the second output voltage is equal to the first output voltage. Based on this solution, when the battery module is a battery pack, the 1:1 relationship between the input voltage and the output voltage can make the charging current larger and the charging speed faster.

With reference to the third aspect and the foregoing possible implementation manners, in another possible implementation manner, the above method further includes: obtaining the charging current of the battery module; if it is determined that the charging current is less than the first preset current, charging the wireless charging The device sends a second AC signal to instruct the wireless charging device to increase its output voltage by a first preset voltage; if it is determined that the charging current is greater than the second preset current, send a third to the wireless charging device AC signal, the third AC signal is used to instruct the wireless charging device to reduce its output voltage by a second preset voltage. Based on this solution, the charging current of the battery module can be maintained within a preset interval to ensure a faster charging speed.

With reference to the third aspect and the foregoing possible implementation manner, in another possible implementation manner, the determining the reference voltage according to the battery voltage includes: determining the reference voltage according to the battery voltage and parameters of the power adapter; The parameters include the voltage, current or power of the power adapter. Based on this solution, it is possible to determine how many times the output voltage is increased by the parameters of the power adapter.

With reference to the third aspect and the foregoing possible implementation manner, in another possible implementation manner, the wireless charging device includes a power adapter and a wireless base, and the sending of the first AC signal to the wireless charging device includes: sending the The first AC signal, or send the first AC signal to the wireless base. Based on this solution, the output voltage of the TX terminal can be increased by a power adapter or a wireless base.

According to a fourth aspect of the embodiments of the present application, a wireless charging control device is provided. The device includes: an acquiring unit for acquiring a battery voltage of a battery module of a terminal, the battery module including one or more batteries; a processing unit for The reference voltage is determined according to the battery voltage, the reference voltage value is N times the battery voltage value, N is greater than or equal to 1; the sending unit is used to send a first AC signal to the wireless charging device, the first AC signal is used to indicate The wireless charging device adjusts the output voltage of the wireless charging device to the reference voltage; the sending unit is further used to send a first control signal to the first switched capacitor module, and the first control signal is used to instruct the first switch The capacitor module converts the input voltage of the first switched capacitor module to a first output voltage; the above-mentioned sending unit is further used to send a second control signal to the second switched capacitor module, and the second control signal is used to instruct the second switch The capacitor module converts the first output voltage to a second output voltage, the second output voltage value is 1/N of the reference voltage value, and the second output voltage is used to power the battery module.

With reference to the fourth aspect, in a possible implementation, if the reference voltage is 4 times the battery voltage, the first output voltage is 1/2 of the input voltage, and the second output voltage is the first output voltage If the reference voltage is twice the battery voltage, the first output voltage is equal to the input voltage, and the second output voltage is 1/2 of the first output voltage.

With reference to the fourth aspect and the foregoing possible implementation manner, in another possible implementation manner, in the case where the battery module includes multiple batteries, if the reference voltage is equal to the battery voltage, the first output voltage is The input voltages are equal, and the second output voltage is equal to the first output voltage.

With reference to the fourth aspect and the above possible implementation manner, in another possible implementation manner, the above acquiring unit is also used to acquire the charging current of the above battery module; the above processing unit is also used to determine that the charging current is less than the first A preset current, or it is determined that the charging current is greater than or equal to a second preset current; if the determining unit determines that the charging current is less than the first preset current, the sending unit is further configured to send a second AC signal to the wireless charging device, The second AC signal is used to instruct the wireless charging device to increase its output voltage by the first preset voltage; if the determination unit determines that the charging current is greater than or equal to the second preset current, the sending unit is also used to charge the wireless charging device The device sends a third AC signal, which is used to instruct the wireless charging device to reduce its output voltage by a second preset voltage.

With reference to the fourth aspect and the foregoing possible implementation manner, in another possible implementation manner, the foregoing processing unit is specifically configured to determine the reference voltage according to the battery voltage and the parameters of the power adapter; the parameters of the power adapter include the power supply The voltage, current, or power of the adapter.

With reference to the fourth aspect and the foregoing possible implementation manner, in another possible implementation manner, the wireless charging device includes a power adapter and a wireless base, and the sending unit is specifically configured to send the first AC signal to the power adapter, or To send the first AC signal to the wireless base.

For the description of the fourth aspect and the effects of the various implementations of the fourth aspect, reference may be made to the descriptions of the third aspect and the corresponding effects of the various implementations of the third aspect, and details are not described herein again.

According to a fifth aspect of the embodiments of the present application, a computer storage medium is provided, in which computer program code is stored, and when the computer program code runs on a processor, the processor is caused to perform the third aspect Or any one of the possible implementation manners of the third aspect.

A sixth aspect of the embodiments of the present application provides a computer program product that stores computer software instructions executed by the processor, and the computer software instructions include a program for executing the solution described in the above aspect.

According to a seventh aspect of the embodiments of the present application, there is provided an apparatus. The apparatus exists in the form of a chip product. The structure of the apparatus includes a processor and a memory. The memory is used to couple with the processor and store necessary programs of the apparatus. Instruction and data, the processor is used to execute the program instructions stored in the memory, so that the device performs the function of the wireless charging control device in the above method.

An eighth aspect of an embodiment of the present application provides a terminal including the charging circuit described in the first aspect or any possible implementation manner of the first aspect, and the fourth aspect or the possibility of the fourth aspect The wireless charging control device according to any one of the implementation manners.

BRIEF DESCRIPTION

1 is a schematic structural diagram of a wireless charging system provided by the prior art;

2 is a schematic structural diagram of a wireless charging system provided by an embodiment of the present application;

3 is a schematic structural diagram of a charging circuit provided by an embodiment of the present application;

4 is a schematic diagram of a principle of a charging circuit provided by an embodiment of the present application;

5 is a schematic diagram of a control signal waveform provided by an embodiment of the present application;

6 is an equivalent circuit diagram of a first switched capacitor module provided by an embodiment of this application;

7 is a schematic structural diagram of a wireless charging circuit provided by an embodiment of the present application;

8 is a schematic diagram of a hardware structure of a terminal provided by an embodiment of the present application;

9 is a flowchart of a wireless charging control method provided by an embodiment of the present application;

10 is a flowchart of another wireless charging control method provided by an embodiment of the present application;

11 is a schematic diagram of the composition of a wireless charging control device provided by an embodiment of the present application;

FIG. 12 is a schematic diagram of another wireless charging control device according to an embodiment of the present application.

detailed description

An embodiment of the present application provides a wireless charging control method. The method is applied to the wireless charging system shown in FIG. 2. As shown in FIG. 2, the wireless charging system includes a power adapter 21, a wireless base 22 and a terminal 23.

The power adapter 21 is used to connect to the city power and perform voltage conversion to convert the AC city power to a DC output. For example, the power adapter 21 can convert 220V AC mains power to DC 12V output. The embodiments of the present application do not limit the specific values of the input voltage and the output voltage of the power adapter. For example, the DC output of the power adapter 21 may also be 5V, 9V, 15V, or 20V, etc. The specific output voltage and the power supply Adapter specifications.

The wireless base 22 includes a wireless charging circuit 221 and a coil 222. The coil is a transmitting coil. After the wireless base 22 is connected to the power adapter 21, the DC power output from the power adapter is converted into high-frequency alternating current and supplied to the coil 222. An induction current is generated in the receiving coil on the side, thereby transferring energy from the transmitting end to the receiving end. The induced current changes into a direct current through a conversion circuit inside the terminal to power the terminal battery module, so as to realize wireless charging from the wireless base to the terminal. The wireless charging circuit in the wireless base can be used for fine voltage regulation. The fine voltage regulation means that the output voltage of the wireless base can be adjusted with a finer granularity. For example, if the input voltage of the wireless base is 12V, you can use the The boost module adjusts its output voltage to 12.3V, or 12.5V, or other voltage values. Compared with the output voltage of the power adapter, the wireless charging circuit in the wireless base can adjust the voltage at a finer granularity.

The terminal 23 includes a charging circuit 231 and a battery module 232. The battery module 232 includes one or more batteries connected in series. The charging circuit 231 is used to filter, rectify, and step down the AC voltage induced by the receiving coil in the charging circuit. Power the battery module.

In order to solve the problems of severe heat generation, slow charging speed, and poor user experience when the terminal is wirelessly charged in the prior art, embodiments of the present application provide a charging circuit, which uses a high-efficiency switched capacitor module to step down voltage, so that Loss during charging is reduced, charging heating is effectively controlled, and the user experience is better.

As shown in FIG. 3, it is a charging circuit 231 provided by an embodiment of the present application. The charging circuit includes: a coil 30, a rectifier filter module 31, a first switched capacitor module 32, and a second switched capacitor module 33. The rectifier filter module The input terminal of 31 is connected to the coil 30, the input terminal of the first switched capacitor module 32 is connected to the output terminal of the rectifier filter module 31, the output terminal of the first switched capacitor module 32 is connected to the input terminal of the second switched capacitor module 33, and the second switched capacitor The output end of the module 33 is used to connect the battery module of the terminal, wherein,

The coil 30 is a receiving coil and is used to induce an external magnetic field and generate an induced voltage.

Exemplarily, the coil 30 is a receiving coil. When the user places the terminal on the wireless base for charging, the current flowing in the transmitting coil in the wireless base generates a magnetic field, so that the receiving coil that is not energized on the terminal side generates an induced current after approaching the magnetic field, thereby realizing wireless charging. It can be understood that the coils in the embodiments of the present application may be wirelessly charged by electromagnetic induction or electromagnetic resonance, which is not limited in the embodiments of the present application, and only electromagnetic induction is used as an example in FIG. 2.

The rectifying and filtering module 31 is used to rectify the AC voltage induced by the coil 30 into a DC output voltage.

The rectification and filtering module may implement filtering and rectification through a full-bridge switch or rectification through other circuits. The embodiment of the present application does not limit the specific circuit structure of the rectification and filtering module 31, and any existing rectification and filtering may be used. The circuit is sufficient.

The first switched capacitor module 32 is configured to receive a first control signal and convert the DC output voltage to a first output voltage; the first output voltage is 1/2 of the DC output voltage.

As shown in FIG. 4, the first switched capacitor module 32 may include: a first switch Q1, a second switch Q2, a third switch Q3, a fourth switch Q4, a first capacitor C1, a second capacitor C2, and a third capacitor C3 Where the first end of the first switch Q1 is the input end of the first switched capacitor module 32, the first end of the first switch Q1 is connected to one end of the third capacitor C3, and the other end of the third capacitor C3 is connected to the ground end, The second terminal of a switch Q1 is connected to the first terminal of the second switch Q2 and the first terminal of the first capacitor C1; the second terminal of the second switch Q2 is the output terminal of the first switched capacitor module 32, and the second terminal of the second switch Q2 Is connected to the first end of the third switch Q3 and one end of the second capacitor C2, and the other end of the second capacitor C2 is connected to the ground; the second end of the third switch Q3 is connected to the other end of the first capacitor C1 and the fourth switch Q4 The first terminal of the second switch Q4 is connected to the ground terminal.

The first control signal includes: a third control signal, a fourth control signal, a fifth control signal, and a sixth control signal, the control terminal of the first switch Q1 inputs the third control signal, and the control terminal of the second switch Q2 inputs the fourth The control signal and the control terminal of the third switch Q3 input a fifth control signal, and the control terminal of the fourth switch Q inputs a sixth control signal.

Exemplarily, the first switched capacitor module 32 can achieve an output voltage halving, that is, the first output voltage is 1/2 of the DC output voltage. Specifically, when the voltage is halved, as shown in FIG. 5, the third control signal and the fifth control signal are the same, the fourth control signal and the sixth control signal are the same, and the duty of the third control signal and the fourth control signal The ratios are all preset ratios and the waveforms are complementary. It can be understood that the preset ratio of the duty ratio of the control signal can be set in the terminal, and optionally, the preset ratio can be set according to the specific function of the first switch module, for example, if the first switched capacitor module The output voltage of is halved, and the preset ratio of the duty cycle can be 50%.

Optionally, the first switch Q1 may be turned on when the third control signal is at a high level and turned off at a low level, or may be turned on when the third control signal is at a low level and turned off at a high level, this application The embodiment does not limit this. Similarly, the on and off of other switches are also controlled by the input of control signals. It should be noted that the on and off conditions of the first switch to the fourth switch should be the same. Here, only the switch is turned on when the control signal is at a high level and turned off at a low level as an example for description.

With reference to the control signal shown in FIG. 5 and the equivalent circuit diagram shown in FIG. 6, if the duration of the third control signal is t1 at a high level and t2 at a low level, at the t1 stage, the third control signal and the fifth The control signal is high level, the fourth control signal and the sixth control signal are low level, the first switch Q1 and the third switch Q3 are turned on, the second switch Q2 and the fourth switch Q4 are turned off, as shown in FIG. 6 (a) The equivalent circuit diagram shown, the first capacitor C1 and the second capacitor C2 are in a series relationship, the first capacitor C1 and the second capacitor C2 are charged, and the voltage of the first capacitor C1 satisfies the formula V _in = V _C1 (t1) +V _out ; at the t2 stage, the third control signal and the fifth control signal are low level, the fourth control signal and the sixth control signal are high level, the first switch Q1 and the third switch Q3 are turned off, the second The switch Q2 and the fourth switch Q4 are turned on. As shown in the equivalent circuit diagram of (b) in FIG. 6, the first capacitor C1 and the second capacitor C2 are in a parallel relationship. The first capacitor C1 charges the second capacitor C2. The voltage of a capacitor C1 satisfies the formula: V _C1 (t2)=V _out . It can be understood that when the first switch Q1 to the fourth switch Q4 are turned on, they can be equivalent to R1 to R4 in the equivalent circuits shown in (a) and (b) of FIG. 6, respectively.

If the high-level duration and the low-level duration of the control signal are equal, that is, t1 is equal to t2, for the first capacitor C1, its charging time and discharging time are equal, according to the law of conservation of energy, the voltage of the capacitor is equal, so V _C1 (t1) = V _C1 (t2), so V _in = V _out + V _out = 2 × V _out , that is, the output voltage (first output voltage) of the first switched capacitor module is its input voltage (DC output voltage) 1/2. Therefore, in the embodiment of the present application, when t1 is equal to t2, the output voltage of the first switched capacitor module is halved. Since the duty ratio of the control signal is high level, the ratio of time occupied within one cycle, that is, in the third control When the duty ratio of the signal to the sixth control signal is 50%, the output voltage of the first switched capacitor module can be halved.

It should be noted that the switching frequency of the first switch Q1 to the fourth switch Q4 should meet: when the first capacitor C1 and the second capacitor C2 are in a series relationship, C1 or C2 is not full, then switch it to a parallel relationship . That is, the conduction time t1<t of the first switch Q1 to the fourth switch Q4, t is the time when the capacitor is fully charged. It can be understood that the conduction time from the first switch to the fourth switch is the high level time from the third control signal to the sixth control signal. When the output voltage of the first switched capacitor module is halved, the third control signal The duty ratio to the sixth control signal is 50%, so the period from the third control signal to the sixth control signal should satisfy T<2*t. The embodiment of the present application does not limit the specific value of the period of the control signal. In practical applications, the period of the control signal may be determined according to the specifications and models of the capacitor.

It can be understood that the first to fourth switches in the embodiment of the present application may be N-type metal-oxide semiconductor field effect transistors (Metal-Oxide-Semiconductor Field-Effect Transistor, MOSFET), or P-type MOSFETs In this embodiment of the present application, the specific types of the above switches are not limited.

The second switched capacitor module 33 is configured to receive a second control signal and convert the first output voltage to a second output voltage; the second output voltage is 1/2 of the first output voltage, and the second output voltage is used to The battery module of the terminal supplies power.

As shown in FIG. 4, the second switched capacitor module 33 includes: a fifth switch Q5, a sixth switch Q6, a seventh switch Q7, an eighth switch Q8, a fourth capacitor C4, a fifth capacitor C5, and a sixth capacitor C6; The first end of the fifth switch Q5 is the input end of the second switched capacitor module 33, the first end of the fifth switch Q5 is connected to one end of the sixth capacitor C6, and the other end of the sixth capacitor C6 is connected to the ground, Q5 The second end of the five switches is connected to the first end of the sixth switch Q6 and one end of the fourth capacitor C4; the second end of the sixth switch Q6 is the output end of the second switched capacitor module 33, and the second end of the sixth switch Q6 The first end of the seventh switch Q7 is connected to one end of the fifth capacitor C5, and the other end of the fifth capacitor C5 is connected to the ground; the second end of the seventh switch Q7 is connected to the other end of the fourth capacitor C4 and the eighth switch Q8 The first terminal, the second terminal of the eighth switch Q8 is connected to the ground terminal.

The above-mentioned second control signal includes: a seventh control signal, an eighth control signal, a ninth control signal and a tenth control signal, a seventh control signal is input to the control terminal of the fifth switch Q5, and an eighth input is input to the control terminal of the sixth switch Q6 The control signal and the control terminal of the seventh switch Q7 input the ninth control signal, and the control terminal of the eighth switch Q8 inputs the tenth control signal.

Exemplarily, the second switched capacitor module 33 may also halve the output voltage, that is, the second output voltage is 1/2 of the first output voltage. Specifically, when the voltage is halved, the seventh control signal and the ninth control signal are the same, the eighth control signal and the tenth control signal are the same, and the duty ratios of the seventh control signal and the eighth control signal are both Set the ratio (50%) and the waveforms are complementary. The principle of halving the output voltage of the second switched capacitor module 33 is the same as that of the first switched capacitor module, and will not be repeated here.

It can be understood that the fifth to eighth switches in the embodiment of the present application may be N-type MOS transistors or P-type MOS transistors. The specific types of the above switches are not limited in the embodiment of the present application.

In the charging circuit of the embodiment of the present application, two switched capacitor modules are used for voltage reduction. The efficiency of the first switched capacitor module is about 98%, and the efficiency of the second switched capacitor module is about 97%. Compared with the absence of inductive devices, the voltage reduction is achieved through switches and capacitors, and the loss of capacitors is lower, so the use of switched capacitor modules for voltage reduction is more efficient than the use of buck circuits. Due to the low voltage loss of using two switched capacitor modules, the charging heating during the charging process can also be effectively controlled.

It should be noted that the charging circuit provided by the embodiment of the present application can realize the output voltage of the charging circuit to be 1/4 of the input voltage through two switched capacitor modules, and when the high-efficiency switched capacitor module is used for voltage reduction, the charging circuit The loss of the battery is reduced, and the charging heating can be effectively controlled.

An embodiment of the present application further provides a wireless charging circuit. As shown in FIG. 7, the wireless charging circuit 221 includes a boost module, a buck module, and a pass-through module. The boost module, the buck module, and the pass-through module are connected in parallel.

The boosting module is used to receive the first AC signal and convert the input voltage of the wireless charging circuit into a first output voltage, and the first output voltage is higher than the input voltage.

It can be understood that the first AC signal may be transmitted to the wireless base through electromagnetic induction generated between the coils, and is used to instruct the wireless charging circuit in the wireless base to perform voltage conversion. Exemplarily, the boosting module may be a boost circuit.

The step-down module is used to receive the second AC signal and convert the input voltage of the wireless charging circuit into a second output voltage, and the second output voltage is lower than the input voltage.

Exemplarily, the step-down module may be a buck circuit.

The pass-through module is used to receive a third AC signal and convert the input voltage of the wireless charging circuit into a third output voltage, the third output voltage being equal to the input voltage.

Exemplarily, the pass-through module may be a pass-through circuit.

It should be noted that, in the wireless charging circuit provided by the embodiment of the present application, the output voltage of the power adapter can be further adjusted by the boost module or the buck module. For example, when the output voltage of the power adapter is limited, but the current capacity is large, the output voltage of the power adapter can be further increased by the boost module in the wireless base, and the boost module or the buck module in the wireless charging circuit The output voltage of the wireless base can be finely adjusted.

An embodiment of the present application also provides a wireless charging control method, which can be applied to the terminal shown in FIG. 8, and the terminal is an electronic device that supports wireless charging.

Exemplarily, FIG. 8 is a schematic diagram of a hardware architecture of a terminal according to an embodiment of the present application. As shown in FIG. 8, the terminal includes a processor 801, a coil 802, a charging management module 803, a power management module 804, a battery 805, and a memory 806.

The processor 801 may include one or more processing units, for example, the processor 801 may include an application processor (application processor, AP), a modem processor, a graphics processor (graphics processing unit, GPU), and an image signal processor (image)signal processor (ISP), controller, memory, video codec, digital signal processor (DSP), baseband processor, and/or neural network processor (Neural-network Processing Unit, NPU) Wait. Among them, different processing units may be independent devices, or may be integrated in one or more processors. Among them, the controller may be the nerve center and command center of the terminal. The controller can generate the operation control signal according to the instruction operation code and the timing signal to complete the control of fetching instructions and executing instructions.

The processor 801 may also be provided with a memory for storing instructions and data. In some embodiments, the memory in the processor 801 is a cache memory. The memory can store instructions or data that the processor 801 has just used or recycled. If the processor 801 needs to use the instruction or data again, it can be directly called from the memory. The repeated access is avoided, and the waiting time of the processor 110 is reduced, thereby improving the efficiency of the system.

The coil 802 is used to induce an external magnetic field and generate an induced current to wirelessly charge the terminal. It can be understood that the coils in the embodiments of the present application may realize wireless charging through electromagnetic induction or electromagnetic resonance.

The charging management module 803 is used to receive charging input from the charger. The charger can be a wireless charger or a wired charger. In the embodiment of the present application, the charger is a wireless charger, and the charging management module 803 may receive the wireless charging input through the wireless charging coil of the terminal. While the charging management module 803 charges the battery 805, it can also supply power to the terminal through the power management module 804. It can be understood that the charging circuit shown in FIGS. 3 and 4 may be a circuit in the charging management module.

The power management module 804 is used to connect the battery 805, the charging management module 803 and the processor 801. The power management module 804 receives the input of the battery 805 and/or the charge management module 803, and supplies power to the processor 801, the memory 806, and components (such as external memory, display screen, camera, wireless communication module, etc.) not shown in FIG. . The power management module 804 can also be used to monitor battery capacity, battery cycle times, battery health status (leakage, impedance) and other parameters. In some other embodiments, the power management module 804 may also be disposed in the processor 801. In other embodiments, the power management module 804 and the charging management module 803 may also be set in the same device.

The battery 805 is used to store electrical energy and supply power to the terminal. The battery 805 may be a single battery or a battery pack with multiple batteries connected in series, which is not limited in this embodiment of the present application.

The memory 806 may be used to store computer executable program code, where the executable program code includes instructions. The processor 801 executes instructions stored in the memory 806 to execute various functional applications and data processing of the terminal. The memory 806 may include a storage program area and a storage data area. Among them, the storage program area may store an operating system, at least one function required application programs (such as sound playback function, image playback function, etc.) and so on. The storage data area can store data (such as audio data, phone book, etc.) created during terminal usage. In addition, the memory 806 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, a universal flash memory (universal flash storage, UFS), and so on.

It is understandable that FIG. 8 only shows some components related to charging in the terminal. In actual applications, the terminal may include more or fewer components than those shown in FIG. 1, or some components may be combined or split. Some components, or different component arrangements. The structure shown in FIG. 1 should not limit the hardware architecture of the terminal provided in the embodiments of the present application.

2-8, as shown in FIG. 9, the wireless charging control method provided by the embodiment of the present application may include steps S901-S904.

S901. Obtain the battery voltage of the battery module of the terminal.

It can be understood that step S901 may be executed by the processor 801 shown in FIG. 8, or step S901 may be executed by the charging management module 803 in FIG. 8.

Exemplarily, the battery module may include one or more batteries. When the battery module includes a plurality of batteries, the plurality of batteries may be a battery pack connected in series.

The battery voltage obtained by the processor may be the processor measuring the battery voltage, or the processor may receive the battery voltage measured by other modules. For example, the second switched capacitor module may measure the battery voltage of the battery module and report it to the processor. The embodiment of the present application does not limit the specific method for the processor to obtain the battery voltage, and here is only an exemplary description.

Exemplarily, the voltage range of a single battery is generally 3.5V-4.5V. If the battery module includes only one battery, only the battery voltage of the battery module is 3.8V as an example; if the battery module includes two batteries, two The batteries are connected in series. Here, only the battery voltage of the battery module is 8V as an example.

S902. Determine a reference voltage according to the battery voltage.

It can be understood that step S902 may be executed by the processor 801 shown in FIG. 8.

The reference voltage value is N times the battery voltage value, and N is greater than or equal to 1. In the embodiments of the present application, the reference voltage value is only 2 times and 4 times the battery voltage value as examples. For example, if the battery module is a single battery, the reference voltage value may be 4 times the battery voltage, that is, the reference voltage may be 15.2V, or the reference voltage value may be 2 times the battery voltage, that is, the reference voltage is 7.6V.

Exemplarily, the above determination of the reference voltage according to the battery voltage may include: determining the reference voltage according to the battery voltage and the parameters of the power adapter, where the parameters of the power adapter include the voltage, current, or power of the power adapter. Specifically, the processor can first determine whether the output voltage of the power adapter can reach N times the battery voltage, and if not, then determine whether the output current or output power of the power adapter can withstand N times the battery voltage.

For example, the processor can determine whether the output voltage of the power adapter can reach 15.2V based on the battery voltage and the voltage of the power adapter. If it is determined that the output voltage of the power adapter can reach 15.2V, determine that the reference voltage is 4 times the battery voltage. By adjusting the circuit in the power adapter, the output voltage of the power adapter is 4 times the battery voltage; if it is determined that the output voltage of the power adapter cannot reach 15.2V, it is further determined whether the power of the power adapter can withstand 4 times the battery voltage, if it can withstand, Make sure that the reference voltage is 4 times the battery voltage, which can be boosted by the booster circuit in the wireless base. For example, the output voltage of the power adapter is 10V and the output current is 4A as an example. Although the output voltage of the power adapter cannot reach 4 times (15.2V) of the battery voltage, the output current of the power adapter is large ( The power of the power supply is relatively large), so the output voltage of the wireless base can be adjusted to 4 times the battery voltage through the booster module in the wireless base, so in this case the reference voltage can also be set to 4 times the battery voltage.

Exemplarily, if the processor determines that the power adapter voltage and power cannot withstand 4 times the battery voltage, it can further determine whether the power adapter voltage and power can withstand 2 times the battery voltage. If it can, determine the reference voltage as the battery voltage 2 times.

It can be understood that the reference voltage is only 4 times or 2 times the battery voltage as an example for illustration.

S903. Send a fourth AC signal to the wireless charging device.

It can be understood that step S903 may be executed by the processor 801 shown in FIG. 8.

The fourth AC signal is used to instruct the wireless charging device to adjust the output voltage of the wireless charging device to a reference voltage. The AC signal can be transmitted to the wireless charging device through electromagnetic induction, and the AC signal carries a reference voltage value.

Exemplarily, the wireless charging device includes a power adapter and a wireless base. The above step S403 may include: sending a fourth AC signal to the power adapter, or sending the fourth AC signal to the wireless base.

It can be understood that, when determining the reference voltage, the processor may determine to adjust the voltage through the power adapter or adjust the voltage through the booster circuit in the wireless base, and send the fourth AC signal to the power adapter or to the wireless charger. For example, if the processor determines that the output voltage of the power adapter can reach 4 times the battery voltage, determines that the reference voltage is 4 times the battery voltage, and sends a fourth AC signal to the power adapter, so that the power adapter adjusts the output voltage of the power adapter Is the reference voltage; if the processor determines that the output voltage of the power adapter cannot reach the battery voltage, the power of the power adapter can withstand 4 times the battery voltage, determines that the reference voltage is 4 times the battery voltage, and sends a fourth AC signal to the wireless base, So that the wireless charging circuit in the wireless base adjusts its output voltage to the reference voltage.

S904. Send a control signal to the charging circuit.

It can be understood that step S904 may be executed by the processor 801 shown in FIG. 8.

The control signal is used to instruct the charging circuit to convert the input voltage of the charging circuit into a target output voltage. The input voltage of the charging circuit is equal to the output voltage of the wireless charging device. The target output voltage value is 1/N of the reference voltage value. The target output voltage is used to power the battery module of the terminal.

Exemplarily, the above charging circuit may be the charging circuit shown in FIG. 4, and the above step S904 may include: sending a first control signal to the first switched capacitor module 32 in FIG. 4, the first control signal is used to indicate the first The switched capacitor module 32 converts its input voltage to a first output voltage; sends a second control signal to the second switched capacitor module 33, the second control signal is used to instruct the second switched capacitor module 33 to convert the first output voltage to the first Two output voltages, the second output voltage being the target output voltage. It can be understood that, as shown in FIG. 3, the input voltage of the first switched capacitor module 32 is the DC output voltage of the output of the rectification and filtering module 31.

For example, if the reference voltage is 4 times the battery voltage, the first control signal is used to instruct the first switched capacitor module to halve its output voltage, and the second control signal is used to instruct the second switched capacitor module to reduce its output voltage Halved to achieve a 4:1 relationship between the input voltage and the output voltage of the charging circuit. If the reference voltage is twice the battery voltage, the first control signal is used to instruct the first switched capacitor module to keep its output voltage and input voltage equal, and the second control signal is used to instruct the second switched capacitor module to reduce its output voltage Half, so as to achieve a 2:1 relationship between the input voltage and the output voltage of the charging circuit.

Exemplarily, the first control signal may include: a third control signal, a fourth control signal, a fifth control signal, and a sixth control signal; the processor in the terminal may pass the first switch capacitor module 32 to the first The switch to the fourth switch sends a third control signal to a sixth control signal to achieve a 2:1 or 1:1 relationship between the output voltage of the first switched capacitor module 32 and the input voltage.

Exemplarily, the second control signal includes: a seventh control signal, an eighth control signal, a ninth control signal, and a tenth control signal; the processor in the terminal may pass the fifth switch in the second switched capacitor module 33 The eighth switch sends the seventh control signal to the tenth control signal to halve the output voltage of the second switched capacitor module 33.

It can be understood that the principle of halving the output voltages of the first switched capacitor module 32 and the second switched capacitor module 33 has been described in the foregoing embodiment, and will not be repeated here.

It should be noted that when the output voltage of the switched capacitor module is halved, the duty ratio of the above control signal is 50%, and the frequency of the control signal can be set to a larger value to ensure that the frequency of the switch is fast enough. The embodiment of the present application does not limit the specific value of the frequency (or period) of the control signal.

The first switched capacitor module 32 and the second switched capacitor module 33 can achieve a 4:1 relationship or a 2:1 relationship between the input voltage and the output voltage, because the step-down module in the embodiment of the present application uses an efficient switched capacitor Module, so the loss during the charging process is low, and the charging heating can be effectively controlled.

It can be understood that, in the case where the battery module is a battery pack in which multiple batteries are connected in series, the reference voltage may be set to the battery voltage, and the charging circuit may also be implemented through the first switched capacitor module 32 and the second switched capacitor module 33 The relationship between the input voltage and the output voltage is 1:1. Specifically, taking the first switched capacitor module 32 as an example, when the first switch Q1 and the second switch Q2 are turned on, and the third switch Q3 and the fourth switch Q4 are turned off, the first switched capacitor module 32 can avoid the first capacitor , Forming a 1:1 relationship between input voltage and output voltage. It should be noted that, when the battery module is a battery pack in which two batteries are connected in series, the 1:1 relationship between the input voltage and the output voltage is equivalent to the 2:1 relationship of a single battery, so the charging current of the battery can also be ensured Larger, faster charging speed.

The wireless charging control method provided by the embodiment of the present application obtains the battery voltage of the battery module of the terminal; determines the reference voltage according to the battery voltage; sends a fourth AC signal to the wireless charging device to adjust the output voltage of the wireless charging device to the reference voltage; Send a control signal to the charging circuit to reduce the input voltage of the charging circuit to the target output voltage. In this embodiment, by increasing the output voltage of the power adapter or the wireless base, the output power of wireless charging is greatly increased, so that the charging current becomes larger and the charging speed is faster. Moreover, a high-efficiency switched capacitor module is used on the terminal side to reduce the voltage, so the loss during the charging process is reduced, the charging heating can be effectively controlled, and the user experience is better.

An embodiment of the present application also provides a wireless charging control method. As shown in FIG. 10, the method further includes steps S1001-S1004.

S1001: Obtain the charging current of the battery module.

It can be understood that step S1001 may be executed by the processor 801 shown in FIG. 8, or step S1001 may be executed by the charging management module 803 in FIG. 8.

Exemplarily, the above-mentioned acquiring the charging current of the battery module may be the processor measuring the charging current of the battery module, or the processor may receive the battery voltage measured by other modules, for example, the second switched capacitor module may measure the charging of the battery module The current is reported to the processor. The embodiment of the present application does not limit the specific method for the processor to obtain the charging current, and this is only an exemplary description.

Optionally, the processor may periodically obtain the charging current of the battery module.

S1002. Determine that the charging current is less than the first preset current, or greater than or equal to the second preset current.

It can be understood that step S1002 may be executed by the processor 801 shown in FIG. 8.

The first preset current is smaller than the second preset current. The first preset current may be a current value set to ensure the charging speed of the terminal, and the second preset current may be an upper limit value of the current that the terminal can withstand. It is understandable that the first preset current and the second preset current may be preset current values set in the terminal. When power adapters of different specifications are used, the preset current value (the first preset current value and the Two preset current values) may be different or the same. The embodiment of the present application does not limit the specific value of the preset current value.

Exemplarily, compare the charging current with the first preset current and the second preset current, if it is determined that the charging current is less than the first preset current, proceed to step S1003; if the charging current is greater than or equal to the second preset current, Continue to step S1004.

S1003: If it is determined that the charging current is less than the first preset current, send a fifth AC signal to the wireless charging device.

It can be understood that step S1003 may be executed by the processor 801 shown in FIG. 8.

The fifth AC signal is used to instruct the wireless charging device to increase its output voltage by the first preset voltage.

It should be noted that the wireless charging device in step S1003 is the same as the wireless charging device in step S903, that is, if the voltage is boosted by the charger in step S903, then step S1003 can also raise the first preset voltage through the charger; if the step In step S903, the wireless base is used to boost the voltage. In step S1003, the wireless base can also be used to boost the first preset voltage.

Exemplarily, in conjunction with the wireless charging circuit shown in FIG. 7, if the voltage is boosted by the wireless base in step S903, in a case where the charging current is small, in order to ensure the charging speed of the terminal, a fifth AC signal may be sent to the wireless base, It is used to instruct the wireless charging circuit in the wireless base to increase its output voltage by the first preset voltage. For example, if the first preset current is 4A, when the processor determines that the charging current is 3.7A, it sends a fifth AC signal to the wireless base, and the booster module (eg, boost circuit) in the wireless base boosts the output voltage by 20mV ( For example, the output voltage before adjustment is 3.8V, and 20mV is raised on the basis of the 3.8V). The embodiment of the present application does not limit the value of the first preset voltage. Here, only 20mV is used as an example for illustration.

S1004: If it is determined that the charging current is greater than the second preset current, send a sixth AC signal to the wireless charging device.

It can be understood that step S1004 may be executed by the processor 801 shown in FIG. 8.

The sixth AC signal is used to instruct the wireless charging device to lower its output voltage by the second preset voltage. The second preset current is greater than the first preset current.

It should be noted that the wireless charging device in step S1004 is the same as the wireless charging device in step S903, that is, if the voltage is boosted by the charger in step S903, step S1003 can also reduce the second preset voltage by the charger; if the step In S903, the wireless base is boosted, and in step S1003, the wireless base may also be used to lower the second preset voltage.

Exemplarily, in conjunction with the wireless charging circuit shown in FIG. 6, if step-up is performed by the wireless base in step S903, in the case of a large charging current, in order to prevent the current from being too large and causing the circuit to burn out, you can send the sixth The AC signal is used to instruct the wireless charging circuit in the wireless base to increase its output voltage by a second preset voltage, which may be the same as the above first preset voltage or may be different from the above preset voltage. The embodiment of the present application does not limit the value of the second preset voltage. For example, if the second preset current is 5A, when the processor determines that the charging current is 5.1A, the sixth AC signal is sent to the wireless base, and the voltage reduction module (eg, buck circuit) in the wireless base lowers the output voltage by 20mV. Here, only the second preset voltage of 20mV is taken as an example for illustration.

The wireless charging control method provided in this application implements the method of obtaining the battery voltage of the battery module of the terminal; determining the reference voltage according to the battery voltage; sending a fourth AC signal to the wireless charging device to adjust the output voltage of the wireless charging device to the reference voltage; The charging circuit sends a control signal to reduce the input voltage of the charging circuit to the target output voltage; obtain the charging current of the battery module; determine that the charging current is less than the first preset current, or, greater than or equal to the second preset current; if the charging current is determined If it is less than the first preset current, the processor sends a fifth AC signal to the wireless charging device; if it is determined that the charging current is greater than the second preset current, the processor sends a sixth AC signal to the wireless charging device. In this embodiment, the high-efficiency switched capacitor module is used for voltage reduction on the terminal side, so the loss during charging is reduced, the charging heating can be effectively controlled, and the user experience is better; and by maintaining the charging current of the battery module at a preset Within the range of current, ensure that the charging speed is faster.

The above mainly introduces the solutions provided by the embodiments of the present invention from the perspective of method steps. It can be understood that, in order to realize the above-mentioned functions, the wireless charging control device includes a hardware structure and/or a software module corresponding to each function. Those skilled in the art should easily realize that, in combination with the units and algorithm steps of the examples described in the embodiments disclosed herein, the present application can be implemented in a combination of hardware and computer software. Professional technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present invention.

The embodiments of the present application may divide the functional modules of the wireless charging control device according to the above method example. For example, each functional module may be divided corresponding to each function, or two or more functions may be integrated into one processing module. The above integrated modules can be implemented in the form of hardware or software function modules. It should be noted that the division of the modules in the embodiment of the present invention is schematic, and is only a division of logical functions. In actual implementation, there may be another division manner.

In the case where each functional module is divided corresponding to each function, FIG. 11 shows a possible structural schematic diagram of the wireless charging control device 1100 involved in the above embodiment. The wireless charging control device 1100 includes: an obtaining unit 1101 The processing unit 1102 and the sending unit 1103. The obtaining unit 1101 is used to support the wireless charging control device 1100 to execute S901 in FIG. 9 or S1001 in FIG. 10; the processing unit 1102 is used to support the wireless charging control device 1100 to execute S902 in FIG. 9 or S1002- in FIG. 10 S1003; The sending unit 1103 is used to support the wireless charging control device 1100 to execute S903-S904 in FIG. 9 or S1003-S1004 in FIG. 10. Wherein, all relevant content of each step involved in the above method embodiments can be referred to the function description of the corresponding function module, which will not be repeated here.

In the case of using an integrated unit, FIG. 12 shows a possible structural schematic diagram of the wireless charging control device involved in the above embodiment. The wireless charging control device 1200 includes a storage module 1201 and a processing module 1202. The processing module 1202 is used to control and manage the actions of the computer. For example, the processing module 1202 is used to support the computer to execute S901-S904 in FIG. 9 or S1001-S1004 in FIG. 10, and/or for the technology described herein Other processes. The storage module 1201 is used to store program codes and data of the computer. When the storage module 1201 is a memory and the processing module 1202 is a processor, the specific structure of the wireless charging control device shown in FIG. 12 may be the terminal shown in FIG. 8 or the chip in the terminal shown in FIG. 8, Wherein, the description of all relevant contents of each component involved in FIG. 8 above can be referred to the functional description of the corresponding component in FIG. 12, which will not be repeated here. For another implementation, the computer structure involved in the foregoing embodiment may also include a processor and an interface, and the processor and the interface communicate. The processor is used to execute the embodiment of the present invention. The processor may be a CPU or other hardware, such as a field programmable gate array (Field-Programmable Gate Array, FPGA), etc., or a combination of both.

The steps of the method or algorithm described in conjunction with the disclosure of the present application may be implemented by hardware, or may be implemented by a processor executing software instructions. Software instructions can be composed of corresponding software modules, which can be stored in random access memory (Random Access Memory, RAM), flash memory, erasable programmable read-only memory (Erasable Programmable ROM, EPROM), electrically erasable Programmably read only memory (Electrically EPROM, EEPROM), registers, hard disk, removable hard disk, CD-ROM or any other form of storage medium well known in the art. An exemplary storage medium is coupled to the processor so that the processor can read information from the storage medium and can write information to the storage medium. Of course, the storage medium may also be an integral part of the processor. The processor and the storage medium may be located in the ASIC. In addition, the ASIC may be located in the core network interface device. Of course, the processor and the storage medium may also exist as discrete components in the core network interface device.

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

The specific embodiments described above further describe the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the scope of the present invention. The scope of protection, any modifications, equivalent replacements, improvements, etc. made on the basis of the technical solution of the present invention, shall be included in the scope of protection of the present invention.

Claims

A charging circuit, characterized in that the charging circuit includes a coil, a rectifying and filtering module, a first switched capacitor module and a second switched capacitor module, an input end of the rectifying and filtering module is connected to the coil and the first switch The input terminal of the capacitor module is connected to the output terminal of the rectifier filter module, the output terminal of the first switched capacitor module is connected to the input terminal of the second switched capacitor module, and the output terminal of the second switched capacitor module is used to connect The battery module of the terminal, where,

The coil is used to induce an external magnetic field and generate an induced voltage;

The rectification and filtering module is used to rectify the induced voltage into a DC output voltage;

The first switched capacitor module is configured to receive a first control signal and convert the DC output voltage to a first output voltage; the first output voltage is 1/2 of the DC output voltage;

The second switched capacitor module is configured to receive a second control signal to convert the first output voltage to a second output voltage; the second output voltage is 1/2 of the first output voltage, the The second output voltage is used to power the battery module.
The charging circuit according to claim 1, wherein the first control signal includes a third control signal, a fourth control signal, a fifth control signal, and a sixth control signal, and the first switched capacitor module includes: A first switch, a second switch, a third switch, a fourth switch, a first capacitor, a second capacitor, and a third capacitor;

The first end of the first switch is the input end of the first switched capacitor module, the first end of the first switch is connected to one end of the third capacitor, and the other end of the third capacitor is connected to the ground , The second end of the first switch is connected to the first end of the second switch and one end of the first capacitor;

The second end of the second switch is the output end of the first switched capacitor module, and the second end of the second switch is connected to the first end of the third switch and one end of the second capacitor. The other end of the second capacitor is connected to the ground terminal;

The second end of the third switch is connected to the other end of the first capacitor and the first end of the fourth switch, and the second end of the fourth switch is connected to the ground end;

The control terminal of the first switch inputs the third control signal, the control terminal of the second switch inputs the fourth control signal, and the control terminal of the third switch inputs the fifth control signal, the The control terminal of the fourth switch inputs the sixth control signal.
The charging circuit according to claim 1 or 2, wherein the second control signal includes a seventh control signal, an eighth control signal, a ninth control signal, and a tenth control signal, and the second switched capacitor module Including: fifth switch, sixth switch, seventh switch, eighth switch, fourth capacitor, fifth capacitor and sixth capacitor;

The first end of the fifth switch is the input end of the second switched capacitor module, the first end of the fifth switch is connected to one end of the sixth capacitor, and the other end of the sixth capacitor is connected to the ground , The second end of the fifth switch is connected to the first end of the sixth switch and one end of the fourth capacitor;

The second end of the sixth switch is the output end of the second switched capacitor module. The second end of the sixth switch is connected to the first end of the seventh switch and the end of the fifth capacitor. The other end of the fifth capacitor is connected to the ground terminal;

The second terminal of the seventh switch is connected to the other terminal of the fourth capacitor and the first terminal of the eighth switch, and the second terminal of the eighth switch is connected to the ground terminal;

The seventh switch is input to the control terminal of the fifth switch, the eighth control signal is input to the control terminal of the sixth switch, and the ninth control signal is input to the control terminal of the seventh switch. The control terminal of the eighth switch inputs the tenth control signal.
The charging circuit according to claim 2 or 3, wherein if the first output voltage is 1/2 of the DC output voltage, the third control signal and the fifth control signal are the same, so The fourth control signal is the same as the sixth control signal, and the duty ratios of the third control signal and the fourth control signal are both preset ratios and have complementary waveforms.
The charging circuit according to claim 3 or 4, wherein if the second output voltage is 1/2 of the first output voltage, the seventh control signal and the ninth control signal are the same, The eighth control signal and the tenth control signal are the same, and the duty ratios of the seventh control signal and the eighth control signal are the preset ratio and the waveforms are complementary.
A wireless charging circuit, characterized in that the wireless charging circuit includes a boost module, a buck module and a pass-through module, the boost module, the buck module and the pass-through module are connected in parallel, wherein,

The boosting module is configured to receive a first AC signal and convert the input voltage of the wireless charging circuit into a first output voltage, and the first output voltage is higher than the input voltage;

The step-down module is configured to receive a second AC signal and convert the input voltage of the wireless charging circuit into a second output voltage, and the second output voltage is lower than the input voltage;

The pass-through module is configured to receive a third AC signal and convert the input voltage of the wireless charging circuit into a third output voltage, and the third output voltage is equal to the input voltage.
The wireless charging circuit according to claim 6, wherein the boost module is a boost circuit, the buck module is a buck circuit, and the pass-through module is a pass-through circuit.
A wireless charging control method, characterized in that the method includes:

Obtain the battery voltage of the battery module of the terminal, where the battery module includes one or more batteries;

A reference voltage is determined according to the battery voltage, the reference voltage value is N times the battery voltage value, and N is greater than or equal to 1;

Sending a first AC signal to the wireless charging device, where the first AC signal is used to instruct the wireless charging device to adjust the output voltage of the wireless charging device to the reference voltage;

Sending a first control signal to the first switched capacitor module, where the first control signal is used to instruct the first switched capacitor module to convert the input voltage of the first switched capacitor module to a first output voltage;

Sending a second control signal to the second switched capacitor module, where the second control signal is used to instruct the second switched capacitor module to convert the first output voltage to a second output voltage, and the second output voltage value is 1/N of the reference voltage value, the second output voltage is used to power the battery module.
The wireless charging control method according to claim 8, wherein if the reference voltage is 4 times the battery voltage, the first output voltage is 1/2 of the input voltage, and the second output voltage Is 1/2 of the first output voltage; if the reference voltage is twice the battery voltage, the first output voltage is equal to the input voltage, and the second output voltage is the first 1/2 of the output voltage.
The wireless charging control method according to claim 8, wherein in the case where the battery module includes a plurality of batteries, if the reference voltage is equal to the battery voltage, the intermediate output voltage and the DC output The voltages are equal, and the target output voltage is equal to the intermediate output voltage.
The wireless charging control method according to any one of claims 8-10, wherein the method further comprises:

Obtain the charging current of the battery module;

If it is determined that the charging current is less than the first preset current, a second AC signal is sent to the wireless charging device, and the second AC signal is used to instruct the wireless charging device to increase the output voltage of the wireless charging device A preset voltage;

If it is determined that the charging current is greater than the second preset current, a third AC signal is sent to the wireless charging device, and the third AC signal is used to instruct the wireless charging device to reduce the output voltage of the wireless charging device A preset voltage.
The wireless charging control method according to any one of claims 8 to 11, wherein the determining the reference voltage according to the battery voltage includes:

The reference voltage is determined according to the battery voltage and the parameters of the power adapter; the parameters of the power adapter include the voltage, current, or power of the power adapter.
The wireless charging control method according to any one of claims 8-12, wherein the wireless charging device includes a power adapter and a wireless base, and the sending of the first AC signal to the wireless charging device includes:

Send the first AC signal to the power adapter, or send the first AC signal to the wireless base.
A computer storage medium storing computer program code in the computer storage medium, characterized in that when the computer program code runs on a processor, the processor is caused to execute any one of claims 8-13 The wireless charging control method.
A terminal, characterized in that the terminal includes a processor and the charging circuit according to any one of claims 1-5, and the processor is used to execute the wireless charging control according to any one of claims 8-13 method.