CN112655132A

CN112655132A - Charging circuit and wireless charging control method

Info

Publication number: CN112655132A
Application number: CN201980057995.6A
Authority: CN
Inventors: 郑志勇
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2019-01-04
Filing date: 2019-01-04
Publication date: 2021-04-13
Anticipated expiration: 2039-01-04
Also published as: WO2020140282A1; CN112655132B

Abstract

The embodiment of the application discloses charging circuit relates to the technical field of power supply, and solves the problems that in the prior art, when a terminal is wirelessly charged, the terminal generates heat seriously, the charging speed is slow, and the user experience is not good. The specific scheme is as follows: the input end of the rectifying and filtering module is connected with the coil, the input end of the first switched capacitor module is connected with the output end of the rectifying and filtering module, the output end of the first switched capacitor module is connected with the input end of the second switched capacitor module, and the output end of the second switched capacitor module is used for connecting a battery module of a terminal, wherein the coil is used for inducing an external magnetic field and generating induced voltage; the rectification filtering module is used for rectifying the induction voltage into direct-current output voltage; the first switch capacitor module is used for receiving a first control signal and converting the direct-current output voltage into a first output voltage; and the second switched capacitor module is used for receiving a second control signal and converting the first output voltage into a second output voltage, and the second output voltage is used for supplying power to the battery module.

Description

Charging circuit and wireless charging control method

Technical Field

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

Background

Along with the wide application of smart phones, the convenience and the commonality of charging mobile phones are more and more valued by more users, and the wireless charging technology is brought forward for the convenience of charging users. The existing wireless terminal charging device mainly comprises a power adapter, a wireless base and 3 modules of a terminal, as shown in fig. 1, the wireless base provides input voltage, relatively fixed receiving end (Receive, RX) output voltage is obtained through terminal side coil coupling and filtering, the RX output voltage charges a battery module through a buck conversion buck circuit, and because the efficiency of the buck circuit is only about 90%, the lower conversion efficiency causes serious heat generation of a mobile phone, the charging speed is lower, and the user experience is poor.

Disclosure of Invention

The embodiment of the application provides a charging circuit and a wireless charging control method, which can improve the conversion efficiency of a terminal, and have the advantages of high charging speed and low loss.

In order to achieve the above purpose, the embodiment of the present application adopts the following technical solutions:

in a first aspect of the embodiments of the present application, a charging circuit is provided, where 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, an input end of the first switched capacitor module is connected to an output end of the rectifying and filtering module, an output end of the first switched capacitor module is connected to an input end of the second switched capacitor module, and an output end of the second switched capacitor module is used for connecting to a battery module of a terminal, where the coil is used for inducing an external magnetic field to generate an induced voltage; the rectification filter module is used for rectifying the induction voltage into direct current output voltage; the first switched capacitor module is configured to receive a first control signal and convert the dc output voltage into a first output voltage; 1/2, where the first output voltage is the DC output voltage; the second switch capacitor module is configured to receive a second control signal and convert the first output voltage into a second output voltage; the second output voltage is 1/2 of the first output voltage, and the second output voltage is used for supplying power to the battery module. Based on this scheme, this charging circuit passes through two switched capacitor modules, can realize that charging circuit's output voltage drops for input voltage's 1/4, when adopting high-efficient switched capacitor module to step down moreover, charging circuit's loss reduces, and it can obtain effectual control to charge to generate heat.

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: the first switch, the second switch, the third switch, the fourth switch, the first capacitor, the second capacitor and the 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 with one end of the third capacitor, the other end of the third capacitor is connected with the ground terminal, and the second end of the first switch is connected with 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, the second end of the second switch is connected with the first end of the third switch and one end of the second capacitor, and the other end of the second capacitor is connected with the ground end; a second end of the third switch is connected with the other end of the first capacitor and a first end of the fourth switch, and a second end of the fourth switch is connected with a ground terminal; the third control signal is input to a control terminal of the first switch, the fourth control signal is input to a control terminal of the second switch, the fifth control signal is input to a control terminal of the third switch, and the sixth control signal is input to a control terminal of the fourth switch. Based on this scheme, this first switched capacitor module can realize high-efficient step-down.

With reference to the first aspect and the foregoing possible implementation manners, 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 switched 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; a first end of the fifth switch is an input end 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 a ground terminal, and a second end of the fifth switch is connected to the first end of the sixth switch and one end of the fourth capacitor; a second end of the sixth switch is an 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 one end of the fifth capacitor, and the other end of the fifth capacitor is connected to a ground end; a second end of the seventh switch is connected to the other end of the fourth capacitor and a first end of the eighth switch, and a second end of the eighth switch is connected to a ground terminal; the seventh control signal is input to a control terminal of the fifth switch, the eighth control signal is input to a control terminal of the sixth switch, the ninth control signal is input to a control terminal of the seventh switch, and the tenth control signal is input to a control terminal of the eighth switch. Based on this scheme, this second switched capacitor module can realize high-efficient step-down.

With reference to the first aspect and the possible implementation manners, in another possible implementation manner, if the first output voltage is 1/2 of the dc output voltage, the third control signal is the same as the fifth control signal, the fourth control signal is the same as the sixth control signal, and duty ratios of the third control signal and the fourth control signal are both preset ratios and have complementary waveforms. Based on the scheme, the first switched capacitor module can realize the 2:1 relation between the input voltage and the output voltage.

With reference to the first aspect and the 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 is the same as the ninth control signal, the eighth control signal is the same as the tenth control signal, and duty ratios of the seventh control signal and the eighth control signal are both the preset ratio and have complementary waveforms. Based on the scheme, the second switched capacitor module can realize the 2:1 relation between the input voltage and the output voltage.

In a second aspect of the embodiments of the present application, a wireless charging circuit is provided, where the wireless charging circuit includes a voltage boost module, a voltage step-down module, and a pass-through module, and the voltage boost module, the voltage step-down module, and the pass-through module are connected in parallel, where the voltage boost module is configured to receive a first alternating current signal and convert an input voltage of the wireless charging circuit into a first output voltage, and the first output voltage is higher than the input voltage; the voltage reduction module is used for receiving a second alternating current signal and converting 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 an input voltage of the wireless charging circuit into a third output voltage, where the third output voltage is equal to the input voltage. Based on this scheme, can carry out comparatively meticulous adjustment to wireless base's output voltage through the module of stepping up or the module of stepping down among the wireless charging circuit.

With reference to the second aspect, in a possible implementation manner, the voltage boosting module is a voltage boosting boost circuit, the voltage reducing module is a buck circuit, and the pass-through module is a pass-through circuit. Based on the scheme, the output voltage of the wireless base can be adjusted through the boost circuit, the buck circuit or the direct circuit.

In a third aspect of the embodiments of the present application, a wireless charging control method is provided, where the method includes: acquiring a battery voltage of a battery module of the terminal, wherein the battery module comprises one or more batteries; determining a reference voltage according to the battery voltage, wherein the reference voltage value is N times of the battery voltage value, and N is greater than or equal to 1; sending a first alternating current signal to a wireless charging device, wherein the first alternating current signal is used for instructing the wireless charging device to adjust the output voltage of the wireless charging device to the reference voltage; sending a first control signal to a first switched capacitor module, wherein the first control signal is used for indicating the first switched capacitor module to convert the input voltage of the first switched capacitor module into a first output voltage; and sending a second control signal to a second switched capacitor module, wherein the second control signal is used for indicating the second switched capacitor module to convert the first output voltage into a second output voltage, the second output voltage value is 1/N of the reference voltage value, and the second output voltage is used for supplying power to the battery module. Based on the scheme, the output voltage of the wireless charging device is increased, and the voltage is reduced through the two switched capacitor modules, so that the output power of wireless charging is greatly increased, the charging current is increased, and the charging speed is high; and because the loss that switched capacitor module step-down is lower, consequently charge and generate heat and can obtain effective control, user experience is better.

With reference to the third aspect, in one possible implementation manner, if the reference voltage is 4 times of a battery voltage, the first output voltage is 1/2 times of the input voltage, and the second output voltage is 1/2 times of the first output voltage; when the reference voltage is 2 times the battery voltage, the first output voltage is equal to the input voltage, and the second output voltage is 1/2 times the first output voltage. Based on the scheme, the 2:1 or 4:1 relation of the input voltage and the output voltage can be realized.

With reference to the third aspect and the possible implementation manners, in another possible implementation manner, when the battery module includes a plurality of batteries, if the reference voltage is equal to the battery voltage, the first output voltage is equal to the input voltage, and the second output voltage is equal to the first output voltage. Based on the scheme, under the condition that the battery module is a battery pack, the charging current is larger and the charging speed is higher through the 1:1 relation between the input voltage and the output voltage.

With reference to the third aspect and the foregoing possible implementation manners, in another possible implementation manner, the method further includes: acquiring the charging current of the battery module; if the charging current is determined to be smaller than the first preset current, sending a second alternating current signal to the wireless charging device, wherein the second alternating current signal is used for indicating the wireless charging device to increase the output voltage of the wireless charging device to a first preset voltage; and if the charging current is determined to be larger than a second preset current, sending a third alternating current signal to the wireless charging device, wherein the third alternating current signal is used for indicating the wireless charging device to reduce the output voltage of the wireless charging device by the second preset voltage. Based on the scheme, the charging current of the battery module can be maintained within a preset interval range, and the charging speed is ensured to be high.

With reference to the third aspect and the foregoing possible implementation manners, in another possible implementation manner, the determining a reference voltage according to the battery voltage includes: determining the reference voltage according to the battery voltage and parameters of the power adapter; the parameter of the power adapter includes a voltage, a current, or a power of the power adapter. Based on this scheme, can confirm how many times with output voltage promotion through power adapter's parameter.

With reference to the third aspect and the foregoing possible implementation manners, in another possible implementation manner, the sending a first alternating current signal to a wireless charging apparatus includes: the first alternating current signal is sent to a power adapter or the first alternating current signal is sent to a wireless base. Based on the scheme, the output voltage of the TX end can be increased through the power adapter or the wireless base.

In a fourth aspect of the embodiments of the present application, there is provided a wireless charging control apparatus, including: an acquisition unit for acquiring a battery voltage of a battery module of a terminal, the battery module including one or more batteries; the processing unit is used for determining a reference voltage according to the battery voltage, the reference voltage value is N times of the battery voltage value, and N is greater than or equal to 1; a transmitting unit, configured to transmit a first ac signal to a wireless charging apparatus, where the first ac signal is used to instruct the wireless charging apparatus to adjust an output voltage of the wireless charging apparatus to the reference voltage; the transmitting unit is further configured to transmit 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 an input voltage of the first switched capacitor module into a first output voltage; the sending unit is further configured to send a second control signal to a second switched capacitor module, where the second control signal is used to instruct the second switched capacitor module to convert the first output voltage into a second output voltage, the second output voltage is 1/N of the reference voltage, and the second output voltage is used to supply power to the battery module.

With reference to the fourth aspect, in one possible implementation manner, if the reference voltage is 4 times of the battery voltage, the first output voltage is 1/2 times of the input voltage, and the second output voltage is 1/2 times of the first output voltage; when the reference voltage is 2 times the battery voltage, the first output voltage is equal to the input voltage, and the second output voltage is 1/2 times the first output voltage.

With reference to the fourth aspect and the possible implementation manners, in another possible implementation manner, when the battery module includes a plurality of batteries, if the reference voltage is equal to the battery voltage, the first output voltage is equal to the input voltage, and the second output voltage is equal to the first output voltage.

With reference to the fourth aspect and the possible implementation manners, in another possible implementation manner, the obtaining unit is further configured to obtain a charging current of the battery module; the processing unit is further configured to determine that the charging current is smaller than a first preset current, or determine that the charging current is greater than or equal to a second preset current; if the determining unit determines that the charging current is smaller than the first preset current, the transmitting unit is further configured to transmit a second alternating current signal to the wireless charging device, where the second alternating current signal is used to instruct the wireless charging device to increase the output voltage of the wireless charging device by a first preset voltage; if the determining unit determines that the charging current is greater than or equal to a second preset current, the transmitting unit is further configured to transmit a third alternating current signal to the wireless charging device, where the third alternating current signal is used to instruct the wireless charging device to reduce the output voltage of the wireless charging device by a second preset voltage.

With reference to the fourth aspect and the foregoing possible implementation manners, in another possible implementation manner, the processing unit is specifically configured to determine the reference voltage according to the battery voltage and a parameter of the power adapter; the parameter of the power adapter includes a voltage, a current, or a power of the power adapter.

With reference to the fourth aspect and the foregoing possible implementation manners, in another possible implementation manner, the wireless charging apparatus includes a power adapter and a wireless base, and the transmitting unit is specifically configured to transmit the first alternating current signal to the power adapter or to transmit the first alternating current signal to the wireless base.

For the above description of the effects of the fourth aspect and the various implementations of the fourth aspect, reference may be made to the description of the corresponding effects of the various implementations of the third aspect and the third aspect, which is not described herein again.

In a fifth aspect of the embodiments of the present application, a computer storage medium is provided, where computer program codes are stored, and when the computer program codes are run on a processor, the processor is caused to execute the wireless charging control method according to any one of the third aspect or possible implementation manners of the third aspect.

In a sixth aspect of the embodiments of the present application, a computer program product is provided, where the computer program product stores computer software instructions executed by the processor, and the computer software instructions include a program for executing the solution of the above aspect.

In a seventh aspect of the embodiments of the present application, there is provided an apparatus, which exists in the form of a chip product, and the apparatus includes a processor and a memory, where the memory is configured to be coupled to the processor and store program instructions and data necessary for the apparatus, and the processor is configured to execute the program instructions stored in the memory, so that the apparatus performs the functions of the wireless charging control apparatus in the foregoing method.

An eighth aspect of an embodiment of the present application provides a terminal, where the terminal includes the charging circuit described in the first aspect or any one of possible implementation manners of the first aspect, and the wireless charging control device described in the fourth aspect or any one of possible implementation manners of the fourth aspect.

Drawings

Fig. 1 is a schematic structural diagram of a wireless charging system provided in the prior art;

fig. 2 is a schematic structural diagram of a wireless charging system according to an embodiment of the present disclosure;

fig. 3 is a schematic structural diagram of a charging circuit according to an embodiment of the present disclosure;

fig. 4 is a schematic diagram of a charging circuit according to an embodiment of the present disclosure;

fig. 5 is a schematic waveform diagram of a control signal according to an embodiment of the present application;

fig. 6 is an equivalent circuit diagram of a first switched capacitor module according to an embodiment of the present disclosure;

fig. 7 is a schematic structural diagram of a wireless charging circuit according to an embodiment of the present disclosure;

fig. 8 is a schematic hardware structure diagram of a terminal according to an embodiment of the present disclosure;

fig. 9 is a flowchart of a wireless charging control method according to an embodiment of the present disclosure;

fig. 10 is a flowchart of another wireless charging control method according to an embodiment of the present disclosure;

fig. 11 is a schematic composition diagram of a wireless charging control device according to an embodiment of the present disclosure;

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

Detailed Description

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

And the power adapter 21 is used for accessing commercial power, performing voltage conversion, and converting alternating-current commercial power into direct-current output. For example, the power adapter 21 may convert 220V ac mains to a dc 12V output. In the embodiment of the present application, specific values of the input voltage and the output voltage of the power adapter are not limited, for example, the dc output of the power adapter 21 may be 5V, 9V, 15V, or 20V, and the specific magnitude of the output voltage depends on the specification of the power adapter.

The wireless base 22 comprises a wireless charging circuit 221 and a coil 222, the coil is a transmitting coil, after the wireless base 22 is connected with the power adapter 21, the direct current output by the power adapter is inverted and converted into high-frequency alternating current to be supplied to the coil 222, induced current is generated in a receiving coil on the terminal side through electromagnetic induction, so that energy is transferred from a transmission end to a receiving end, the induced current is converted into direct current through a conversion circuit inside the terminal to supply power to a terminal battery module, and wireless charging from the wireless base to the terminal is achieved. The wireless charging circuit in the wireless base can be used for fine voltage regulation, which means that the output voltage of the wireless base can be adjusted to a finer granularity, for example, if the input voltage of the wireless base is 12V, the output voltage of the wireless base can be adjusted to 12.3V, 12.5V or other voltage values by the boost module in the wireless base, and the wireless charging circuit in the wireless base can adjust the voltage to a finer granularity than the output voltage of the power adapter.

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, and the charging circuit 231 is configured to filter, rectify, and step down an ac voltage induced by a receiving coil in the charging circuit to supply power to the battery module.

In order to solve the problem that the terminal generates heat seriously, the charging speed is slower when wirelessly charging in the prior art, and the user experience is not good, the embodiment of the application provides a charging circuit which reduces the voltage through a high-efficiency switched capacitor module, so that the loss in the charging process is reduced, the charging and the heating are effectively controlled, and the user experience is better.

As shown in fig. 3, a charging circuit 231 according to an embodiment of the present application includes: a coil 30, a rectifying and filtering module 31, a first switched capacitor module 32 and a second switched capacitor module 33, wherein the input end of the rectifying and filtering module 31 is connected with the coil 30, the input end of the first switched capacitor module 32 is connected with the output end of the rectifying and filtering module 31, the output end of the first switched capacitor module 32 is connected with the input end of the second switched capacitor module 33, the output end of the second switched capacitor module 33 is used for connecting with a battery module of a terminal, wherein,

the coil 30, which is a receiving coil, is used to induce an external magnetic field, generating an induced voltage.

Illustratively, the coil 30 is a receive coil. When a user places the terminal on the wireless base for charging, the current flowing through the transmitting coil in the wireless base can generate a magnetic field, so that the receiving coil which is not electrified at the terminal side can generate an induced current after being close to the magnetic field, and wireless charging is realized. It can be understood that the coil in the embodiment of the present application may implement wireless charging in an electromagnetic induction manner or an electromagnetic resonance manner, which is not limited in the embodiment of the present application, and fig. 2 only illustrates electromagnetic induction as an example.

And the rectifying and filtering module 31 is configured to rectify the ac voltage induced by the coil 30 into a dc output voltage.

This rectification and filtering module can realize the filtering rectification through the full-bridge switch, also can carry out the rectification through other circuits, and this application embodiment does not restrict to this rectification and filtering module 31's concrete circuit structure, can use any current rectification and filtering circuit can.

A first switched capacitor module 32, configured to receive a first control signal and convert the dc output voltage into 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; a first end of the first switch Q1 is an input end of the first switched capacitor module 32, a first end of the first switch Q1 is connected to one end of the third capacitor C3, the other end of the third capacitor C3 is connected to the ground, and a second end of the first switch Q1 is connected to a first end of the second switch Q2 and one end of the first capacitor C1; a second end of the second switch Q2 is an output end of the first switched capacitor module 32, a second end of the second switch Q2 is connected to a 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 a ground end; a second terminal of the third switch Q3 is connected to the other terminal of the first capacitor C1 and a first terminal of the fourth switch Q4, and a second terminal of the fourth switch Q4 is connected to the ground terminal.

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

Illustratively, the first switched-capacitor module 32 may implement output voltage halving, i.e., 1/2 where the first output voltage is the dc output voltage. Specifically, when the voltage halving is implemented, 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 ratios of the third control signal and the fourth control signal are both preset ratios and have complementary waveforms. It is understood that the preset proportion of the duty ratio of the control signal may be set in the terminal, and optionally, the preset proportion may be set according to the specific function of the first switch module, for example, if the output voltage of the first switch capacitor module is halved, the preset proportion of the duty ratio may be 50%.

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

With reference to the control signals shown in fig. 5 and the equivalent circuit diagram shown in fig. 6, if the duration of the high level of the third control signal is t1 and the duration of the low level is t2, during the period t1, the third control signal and the fifth control signal are high, the fourth control signal and the sixth control signal are low, the first switch Q1 and the third switch Q3 are turned on, and the second switch Q2 and the fourth switch Q4 are turned off, as shown in the equivalent circuit diagram shown in (a) of fig. 6, the first capacitor C1 and the second capacitor C2 are connected in series, the first capacitor C1 and the second capacitor C2 are charged, and the third capacitor C2 is chargedThe voltage of a capacitor C1 satisfies the formula V_in＝V _C1(t1)+V _out(ii) a At the stage t2, the third control signal and the fifth control signal are at low level, the fourth control signal and the sixth control signal are at high level, the first switch Q1 and the third switch Q3 are turned off, the second switch Q2 and the fourth switch Q4 are turned on, as shown in the equivalent circuit diagram (b) in fig. 6, the first capacitor C1 and the second capacitor C2 are in parallel connection, the first capacitor C1 charges the second capacitor C2, and the voltage of the first capacitor C1 satisfies the formula: v_C1(t2)＝V _out. It is understood that the first to fourth switches Q1 to Q4 may be equivalent to R1 to R4 in equivalent circuits shown in (a) of fig. 6 and (b) of fig. 6, respectively, when turned on.

If the high level duration and the low level duration of the control signal are equal, i.e. t1 equals t2, the charging time and the discharging time of the first capacitor C1 are equal, and the voltages of the capacitors are equal according to the law of conservation of energy, so V_C1(t1)＝V _C1(t2) so V_in＝V _out+V _out＝2×V _outI.e. the output voltage of the first switched-capacitor module (first output voltage) is 1/2 of its input voltage (dc output voltage). 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, and the halving of the output voltage of the first switched capacitor module can be realized when the duty ratio of the control signal is high and the duty ratio of the control signal is within one period, that is, when the duty ratios of the third to sixth control signals are 50%.

It should be noted that the switching frequencies of the first switch Q1 to the fourth switch Q4 should satisfy: when the first capacitor C1 and the second capacitor C2 are in series, either C1 or C2 is not yet fully charged and is switched to a parallel relationship. That is, the on-time t1 of the first to fourth switches Q1 to Q4 is less than t, which is the time when the capacitor is fully charged. It can be understood that the on time of the first to fourth switches is the high level time of the third to sixth control signals, and since the duty ratio of the third to sixth control signals is 50% when the output voltage of the first switched capacitor module is halved, the period of the third to sixth control signals should satisfy T <2 × T. The embodiment of the application does not limit the specific value of the period of the control signal, and in practical application, the period of the control signal can be determined according to the specification and model of the capacitor.

It is to be understood that the first to fourth switches in the embodiment of the present application may be Metal-Oxide-Semiconductor Field Effect transistors (MOSFETs) or P-type MOSFETs, and the specific type of the switches in the embodiment of the present application is not limited.

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

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; a first end of the fifth switch Q5 is an input end of the second switched capacitor module 33, a first end of the fifth switch Q5 is connected to one end of the sixth capacitor C6, the other end of the sixth capacitor C6 is connected to the ground, and a second end of the Q5 fifth switch is connected to a first end of the sixth switch Q6 and one end of the fourth capacitor C4; a second terminal of the sixth switch Q6 is an output terminal of the second switched capacitor module 33, a second terminal of the sixth switch Q6 is connected to the first terminal of the seventh switch Q7 and one terminal of the fifth capacitor C5, and the other terminal of the fifth capacitor C5 is connected to the ground terminal; a second terminal of the seventh switch Q7 is connected to the other terminal of the fourth capacitor C4 and a first terminal of the eighth switch Q8, and a second terminal of the eighth switch Q8 is connected to the ground terminal.

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

For example, the second switched-capacitor module 33 may also implement output voltage halving, i.e. the second output voltage is 1/2 of the first output voltage. Specifically, when the voltage halving is realized, the seventh control signal is the same as the ninth control signal, the eighth control signal is the same as the tenth control signal, the duty ratios of the seventh control signal and the eighth control signal are both preset ratios (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 is not described herein again.

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, and the embodiment of the present application does not limit the specific types of the switches.

The charging circuit in the embodiment of the application adopts two switched capacitor modules to reduce the voltage, the efficiency of the first switched capacitor module is about 98%, the efficiency of the second switched capacitor module is about 97%, the switched capacitor module does not have the participation of an inductance device compared with the buck circuit, the voltage reduction is realized through the switch and the capacitor, the loss of the capacitor is lower, and therefore the efficiency of adopting the buck circuit to reduce the voltage by the switched capacitor module is higher. Because the loss of voltage reduction by adopting the two switched capacitor modules is lower, the charging and heating in the charging process can be effectively controlled.

It should be noted that, according to the charging circuit provided in the embodiment of the present application, 1/4 that the output voltage of the charging circuit is reduced to the input voltage can be realized 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 heat generation can be effectively controlled.

The embodiment of the present application further provides a wireless charging circuit, as shown in fig. 7, the wireless charging circuit 221 includes a voltage boosting module, a voltage reducing module, and a pass-through module, and the voltage boosting module, the voltage reducing module, and the pass-through module are connected in parallel.

The boost module is used for receiving the first alternating current signal and converting 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 is 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. Illustratively, the boost module may be a boost circuit.

And the voltage reduction module is used for receiving the second alternating current signal and converting the input voltage of the wireless charging circuit into a second output voltage, and the second output voltage is lower than the input voltage.

Illustratively, the voltage reduction module may be a buck circuit.

And the direct connection module is used for receiving the third alternating current signal and converting the input voltage of the wireless charging circuit into a third output voltage, and the third output voltage is equal to the input voltage.

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

It should be noted that, in the wireless charging circuit provided in the embodiment of the present application, the output voltage of the power adapter may be further adjusted by the voltage boosting module or the voltage dropping module. For example, when the output voltage of the power adapter is limited but the current capability is large, the output voltage of the power adapter can be further increased through the boost module in the wireless base, and the boost module or the buck module in the wireless charging circuit can perform fine adjustment on the output voltage of the wireless base.

The embodiment of the present application further provides a wireless charging control method, which may be applied to the terminal shown in fig. 8, where the terminal is an electronic device supporting 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 charge management module 803, a power management module 804, a battery 805, and a memory 806.

Processor 801 may include one or more processing units, such as: the processor 801 may include an Application Processor (AP), a modem processor, a Graphics Processing Unit (GPU), an Image Signal Processor (ISP), a controller, a memory, a video codec, a Digital Signal Processor (DSP), a baseband processor, and/or a Neural-Network Processing Unit (NPU), among others. The different processing units may be separate devices or may be integrated into one or more processors. Wherein, the controller can be the neural center and the command center of the terminal. The controller can generate an operation control signal according to the instruction operation code and the timing signal to complete the control of instruction fetching and instruction execution.

A memory may also be provided in the processor 801 for storing instructions and data. In some embodiments, the memory in the processor 801 is a cache memory. The memory may hold instructions or data that have just been used or recycled by the processor 801. If the processor 801 needs to use the instruction or data again, it can be called directly from the memory. Avoiding repeated accesses reduces the latency of the processor 110, thereby increasing the efficiency of the system.

And a coil 802 for inducing an external magnetic field to generate an induced current, thereby wirelessly charging the terminal. It can be understood that the coil in the embodiment of the present application may implement wireless charging in an electromagnetic induction manner or an electromagnetic resonance manner.

A charging management module 803 for receiving charging input from the charger. The charger may be a wireless charger or a wired charger. In this embodiment of the application, the charger is a wireless charger, and the charging management module 803 may receive a wireless charging input through a wireless charging coil of the terminal. The charging management module 803 may also provide power to the terminal through the power management module 804 while charging the battery 805. It will be appreciated that the charging circuits shown in fig. 3 and 4 may be circuits in a charge management module.

A power management module 804 for connecting a battery 805, a charging management module 803 and the processor 801. The power management module 804 receives input from the battery 805 and/or the charge management module 803 and provides power to the processor 801, the memory 806, and components not shown in fig. 8 (e.g., external memory, display screen, camera, wireless communication module, etc.). The power management module 804 may also be used to monitor parameters such as battery capacity, battery cycle number, battery state of health (leakage, impedance), etc. In 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 be disposed in the same device.

The battery 805 is used for storing electric energy and supplying power to the terminal, and the battery 805 may be a single battery or a battery pack formed by connecting a plurality of batteries in series, which is not limited in this embodiment of the application.

Memory 806 may be used to store computer-executable program code, including instructions. The processor 801 executes various functional applications of the terminal and data processing by executing instructions stored in the memory 806. The memory 806 may include a program storage area and a data storage area. The storage program area may store an operating system, an application program (such as a sound playing function, an image playing function, etc.) required by at least one function, and the like. The storage data area may store data (such as audio data, a phonebook, etc.) created during use of the terminal, and the like. Further, the memory 806 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one magnetic disk storage device, a flash memory device, a universal flash memory (UFS), and the like.

It is understood that fig. 8 only shows some components of the terminal related to charging, and in practical applications, the terminal may include more or less components than those shown in fig. 1, or some components may be combined, or some components may be separated, or different component arrangements may be adopted. The structure shown in fig. 1 should not limit the hardware architecture of the terminal provided in the embodiment of the present application.

With reference to fig. 2 to 8, as shown in fig. 9, the wireless charging control method provided in the embodiment of the present application may include steps S901 to S904.

And S901, acquiring the battery voltage of a battery module of the terminal.

It is understood that step S901 may be performed by the processor 801 shown in fig. 8, or step S901 may be performed by the charge management module 803 in fig. 8.

For example, the battery module may include one or more batteries, and when the battery module includes a plurality of batteries, the plurality of batteries may be battery packs connected in series.

The processor may obtain the battery voltage by measuring the battery voltage by the processor, or the processor receives the battery voltage measured by another module, for example, the second switched capacitor module may measure the battery voltage of the battery module and report the measured battery voltage to the processor.

For example, the voltage range of the single battery is generally 3.5V to 4.5V, and if the battery module includes only one battery, the battery voltage of the battery module is only 3.8V as an example; if the battery module includes two batteries, the two batteries are connected in series, and the battery voltage of the battery module is only 8V as an example.

And S902, determining a reference voltage according to the battery voltage.

It is understood that step S902 may be performed by the processor 801 shown in fig. 8.

The reference voltage value is N times of the battery voltage value, and N is greater than or equal to 1. The present embodiment is described by taking only the reference voltage value as 2 times and 4 times as much as the battery voltage value as an example. For example, if the battery module is a single battery, the reference voltage value may be 4 times the battery voltage, i.e., the reference voltage may be 15.2V, or the reference voltage value may be 2 times the battery voltage, i.e., the reference voltage is 7.6V.

For example, the determining the reference voltage according to the battery voltage may include: the reference voltage is determined from the battery voltage and parameters of the power adapter, including the voltage, current, or power of the power adapter. Specifically, the processor may first determine whether the output voltage of the power adapter can reach N times of the battery voltage, and if not, then determine whether the output current or the output power of the power adapter can withstand N times of the battery voltage.

For example, the processor may determine whether the output voltage of the power adapter can reach 15.2V according to the battery voltage and the voltage of the power adapter, and 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, and may adjust a circuit in the power adapter so that the output voltage of the power adapter is 4 times the battery voltage; if the output voltage of the power adapter cannot reach 15.2V, whether the power of the power adapter can bear 4 times of the battery voltage is further judged, and if the power of the power adapter can bear the 4 times of the battery voltage is determined, the reference voltage is 4 times of the battery voltage and can be boosted through a boosting circuit in the wireless base. For example, although the output voltage of the power adapter is 10V and the output current is 4A, the output voltage of the power adapter cannot be 4 times (15.2V) the battery voltage, but since the output current of the power adapter is large (the power for power matching is large), the output voltage of the wireless base can be adjusted to 4 times the battery voltage by the boosting module in the wireless base, and therefore, in this case, the reference voltage may be set to 4 times the battery voltage.

For example, if the processor determines that neither the voltage nor the power of the power adapter can withstand 4 times the battery voltage, it may further determine whether the voltage and the power of the power adapter can withstand 2 times the battery voltage, and if so, determine that the reference voltage is 2 times the battery voltage.

It is understood that the reference voltage is only exemplified as 4 times or 2 times the battery voltage.

And S903, transmitting a fourth alternating current signal to the wireless charging device.

It is understood that step S903 may be performed 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 the reference voltage. The alternating current signal can be transmitted to the wireless charging device through electromagnetic induction, and the reference voltage value is carried in the alternating current signal.

Illustratively, the wireless charging device includes a power adapter and a wireless base, and the step S403 may include: and sending the fourth alternating current signal to the power adapter or sending the fourth alternating current signal to the wireless base.

It will be appreciated that the processor may, in determining the reference voltage, determine whether to adjust the voltage by the power adapter or by a boost circuit in the wireless dock, and send a 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 of the battery voltage, the processor determines that the reference voltage is 4 times of the battery voltage, and sends a fourth alternating current signal to the power adapter, so that the power adapter adjusts the output voltage of the power adapter to the reference voltage; if the processor determines that the output voltage of the power adapter cannot reach the battery voltage, the power adapter has the capability of withstanding 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 dock to cause the wireless charging circuit in the wireless dock to adjust its output voltage to the reference voltage.

And S904, sending a control signal to the charging circuit.

It is understood that step S904 may be performed by the processor 801 shown in fig. 8.

The control signal is used for instructing 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, and the target output voltage is used for supplying power to the battery module of the terminal.

For example, the charging circuit may be the charging circuit shown in fig. 4, and the step S904 may include: sending a first control signal to the first switched-capacitor module 32 in fig. 4, where the first control signal is used to instruct the first switched-capacitor module 32 to convert its input voltage into a first output voltage; and sending a second control signal to the second switched capacitor module 33, where the second control signal is used to instruct the second switched capacitor module 33 to convert the first output voltage into a second output voltage, and the second output voltage is 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 rectifying 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 the output voltage thereof, and the second control signal is used to instruct the second switched capacitor module to halve the output voltage thereof, thereby realizing a 4:1 relationship between the input voltage and the output voltage of the charging circuit. If the reference voltage is 2 times of the battery voltage, the first control signal is used for indicating the first switched capacitor module to keep the output voltage of the first switched capacitor module equal to the input voltage of the first switched capacitor module, and the second control signal is used for indicating the second switched capacitor module to halve the output voltage of the second switched capacitor module, so that the 2:1 relation between the input voltage and the output voltage of the charging circuit is realized.

For example, 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 implement a 2:1 or 1:1 relationship of the output voltage to the input voltage of the first switched-capacitor module 32 by sending third to sixth control signals to the first to fourth switches in the first switched-capacitor module 32.

Illustratively, 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 halve the output voltage of the second switched-capacitor module 33 by sending seventh to tenth control signals to the fifth to eighth switches in the second switched-capacitor module 33.

It is understood that the principle of halving the output voltage of the first switched capacitor module 32 and the second switched capacitor module 33 is described in the foregoing embodiments, and will not be described herein again.

It should be noted that, when the half reduction of the output voltage of the switched capacitor module is implemented, the duty ratios of the control signals are all 50%, and the frequency of the control signals may be set to a larger value to ensure that the frequency of the switching is fast enough. The specific value of the frequency (or period) of the control signal is not limited in the embodiment of the present application.

The first switched capacitor module 32 and the second switched capacitor module 33 can realize 4: the voltage reduction module in the embodiment of the application adopts a high-efficiency switched capacitor module, so that the loss in the charging process is low, and the charging heating can be effectively controlled.

It is understood that, in the case where the battery module is a battery pack in which a plurality of batteries are connected in series, the reference voltage may be set to the battery voltage, and the relationship between the input voltage and the output voltage 1:1 of the charging circuit may also be realized by the first switched capacitor module 32 and the second switched capacitor module 33 described above. 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 may avoid the first capacitor, and form 1: the relation 1. In the case where 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 corresponds to the 2:1 relationship of a single battery, and therefore, a large charging current and a high charging speed of the battery can be ensured.

According to the wireless charging control method provided by the embodiment of the application, the battery voltage of the battery module of the terminal is obtained; determining a reference voltage according to the battery voltage; sending a fourth alternating current signal to the wireless charging device, and adjusting the output voltage of the wireless charging device to be a reference voltage; and sending a control signal to the charging circuit to reduce the input voltage of the charging circuit to a target output voltage. In this embodiment, through improving power adapter or wireless base's output voltage for wireless charging's output increases by a wide margin, thereby charging current grow, and the charging speed is very fast. And, adopted high-efficient switched capacitor module to step down at the terminal side, consequently the loss in the charging process reduces, and charging and generating heat can be effectively controlled, and user experience is better.

The embodiment of the present application further provides a wireless charging control method, as shown in fig. 10, the method further includes steps S1001 to S1004.

And S1001, acquiring the charging current of the battery module.

It is understood that step S1001 may be performed by the processor 801 shown in fig. 8, or step S1001 may be performed by the charge management module 803 in fig. 8.

For example, the obtaining of the charging current of the battery module may be that the processor measures the charging current of the battery module, or the processor receives a battery voltage measured by another module, for example, the second switched capacitor module measures the charging current of the battery module and reports the charging current to the processor.

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

S1002, determining that the charging current is smaller than a first preset current, or larger than or equal to a second preset current.

It is understood that step S1002 may be performed by the processor 801 shown in fig. 8.

The first predetermined current is less than the second predetermined current. The first preset current may be a current value set to secure a charging speed of the terminal, and the second preset current may be an upper limit value of a current that the terminal can withstand. It can be understood that the first preset current and the second preset current may be preset current values set in the terminal, and when power adapters of different specifications are adopted, the preset current values (the first preset current value and the second preset current value) may be different or the same, and a specific value of the preset current value is not limited in the embodiment of the present application.

Illustratively, the charging current is compared with a first preset current and a second preset current, and if the charging current is determined to be smaller than the first preset current, the step S1003 is continuously executed; if the charging current is greater than or equal to the second predetermined current, step S1004 is continuously performed.

And S1003, if the charging current is determined to be smaller than the first preset current, transmitting a fifth alternating current signal to the wireless charging device.

It is understood that step S1003 may be performed by the processor 801 shown in fig. 8.

The fifth alternating current signal is used for instructing the wireless charging device to increase the output voltage of the wireless charging device to a 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, the first preset voltage may be boosted by the charger in step S1003; if the voltage is increased by the wireless base in step S903, the first preset voltage may also be increased by the wireless base in step S1003.

For example, in combination with the wireless charging circuit shown in fig. 7, if the voltage is boosted by the wireless base in step S903, in order to ensure the charging speed of the terminal when the charging current is small, a fifth ac signal may be sent to the wireless base for instructing the wireless charging circuit in the wireless base to boost the output voltage thereof by the first preset voltage. For example, if the first predetermined current is 4A, when the processor determines that the charging current is 3.7A, the processor sends a fifth ac signal to the wireless base, and the boost module (e.g., boost circuit) in the wireless base boosts the output voltage by 20mV (e.g., the output voltage before adjustment is 3.8V, and 20mV is boosted on the basis of the 3.8V). In the embodiment of the present application, the value of the first preset voltage is not limited, and is only exemplified by 20 mV.

And S1004, if the charging current is determined to be larger than the second preset current, transmitting a sixth alternating current signal to the wireless charging device.

It is understood that step S1004 may be performed by the processor 801 shown in fig. 8.

The sixth ac signal is used to instruct the wireless charging device to decrease the output voltage thereof by a second predetermined voltage. The second preset current is larger than the first preset current.

The wireless charging device in step S1004 is the same as the wireless charging device in step S903, that is, if the voltage is increased by the charger in step S903, the second preset voltage may be decreased by the charger in step S1003; if the voltage is increased by the wireless cradle in step S903, the second preset voltage may be decreased by the wireless cradle in step S1003.

For example, in combination with the wireless charging circuit shown in fig. 6, if the voltage is boosted by the wireless base in step S903, in order to prevent the circuit from burning out due to too large current when the charging current is large, a sixth ac signal may be sent to the wireless base for instructing the wireless charging circuit in the wireless base to boost the output voltage thereof by a second preset voltage, where the second preset voltage may be the same as the first preset voltage or different from the first preset voltage. The value of the second preset voltage is not limited in the embodiment of the present application. For example, if the second predetermined current is 5A, when the processor determines that the charging current is 5.1A, a sixth ac signal is sent to the wireless base, and the voltage reduction module (e.g., buck circuit) in the wireless base reduces the output voltage by 20 mV. The second preset voltage is only exemplified as 20 mV.

According to the wireless charging control method, the battery voltage of the battery module of the terminal is obtained; determining a reference voltage according to the battery voltage; sending a fourth alternating current signal to the wireless charging device, and adjusting the output voltage of the wireless charging device to be a reference voltage; sending a control signal to the charging circuit, and reducing the input voltage of the charging circuit to a target output voltage; acquiring the charging current of the battery module; determining that the charging current is smaller than a first preset current or larger than or equal to a second preset current; if the charging current is determined to be smaller than the first preset current, the processor sends a fifth alternating current signal to the wireless charging device; and if the charging current is determined to be larger than the second preset current, the processor sends a sixth alternating current signal to the wireless charging device. In the embodiment, the voltage reduction is carried out by adopting the high-efficiency switched capacitor module at the terminal side, so that the loss in the charging process is reduced, the charging heating can be effectively controlled, and the user experience is better; and the charging speed is ensured to be high by maintaining the charging current of the battery module within the range of the preset current.

The above description has introduced the scheme provided by the embodiments of the present invention mainly from the perspective of the method steps. It is understood that, in order to implement the above functions, the wireless charging control apparatus includes a hardware structure and/or a software module corresponding to each function. Those of skill in the art would readily appreciate that the present application is capable of being implemented as a combination of hardware and computer software for carrying out the various example elements and algorithm steps described in connection with the embodiments disclosed herein. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.

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

In the case of dividing each functional module according to each function, fig. 11 shows a schematic diagram of a possible structure of the wireless charging control apparatus 1100 according to the above-described embodiment, and the wireless charging control apparatus 1100 includes: an acquisition unit 1101, a processing unit 1102 and a sending unit 1103. The acquisition unit 1101 is configured to support the wireless charging control apparatus 1100 to execute S901 in fig. 9 or S1001 in fig. 10; the processing unit 1102 is configured to support the wireless charging control apparatus 1100 to perform S902 in fig. 9 or S1002 to S1003 in fig. 10; the transmission unit 1103 is configured to support the wireless charging control apparatus 1100 to perform S903 to S904 in fig. 9 or S1003 to S1004 in fig. 10. All relevant contents of each step related to the above method embodiment may be referred to the functional description of the corresponding functional module, and are not described herein again.

In the case of an integrated unit, fig. 12 shows a schematic diagram of a possible structure of the wireless charging control device according to the above embodiment. The wireless charging control apparatus 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, e.g., the processing module 1202 is used to support the computer to perform S901-S904 of FIG. 9, or S1001-S1004 of FIG. 10, and/or other processes for the techniques described herein. A storage module 1201 for storing 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 apparatus shown in fig. 12 may be the terminal shown in fig. 8 or a chip in the terminal shown in fig. 8, where the description of all relevant contents of the components related to fig. 8 may be referred to the functional description of the components corresponding to fig. 12, and is not repeated herein. In another implementation, the computer structure according to the above embodiments may further include a processor and an interface, the processor and the interface communicating with each other, and the processor being configured to execute the embodiments of the present invention. The processor may be a CPU, or other hardware, such as a Field-Programmable Gate Array (FPGA), etc., or a combination of both.

The steps of a method or algorithm described in connection with the disclosure herein may be embodied in hardware or in software instructions executed by a processor. The software instructions may be comprised of corresponding software modules that may be stored in Random Access Memory (RAM), flash Memory, Erasable Programmable read-only Memory (EPROM), Electrically Erasable Programmable read-only Memory (EEPROM), registers, a hard disk, a removable disk, a compact disc read-only Memory (CD-ROM), or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor such the processor can read information from, and write information to, the storage medium. Of course, the storage medium may also be integral to the processor. The processor and the storage medium may reside in an ASIC. Additionally, the ASIC may reside in a core network interface device. Of course, the processor and the storage medium may reside as discrete components in a core network interface device.

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

The above-mentioned embodiments, objects, technical solutions and advantages of the present invention are further described in detail, it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made on the basis of the technical solutions of the present invention should be included in the scope of the present invention.

Claims

A charging circuit is characterized in that the charging circuit comprises a coil, a rectifying and filtering module, a first switch capacitor module and a second switch capacitor module, wherein the input end of the rectifying and filtering module is connected with the coil, the input end of the first switch capacitor module is connected with the output end of the rectifying and filtering module, the output end of the first switch capacitor module is connected with the input end of the second switch capacitor module, the output end of the second switch capacitor module is used for connecting a battery module of a terminal, wherein,

the coil is used for inducing an external magnetic field and generating induced voltage;

the rectification filtering module is used for rectifying the induction voltage into direct current output voltage;

the first switch capacitor module is used for receiving a first control signal and converting the direct-current output voltage into a first output voltage; the first output voltage is 1/2 of the DC output voltage;

the second switched capacitor module is used for receiving a second control signal and converting the first output voltage into a second output voltage; the second output voltage is 1/2 of the first output voltage, and the second output voltage is used for supplying power to the battery module.
The charging circuit of claim 1, wherein the first control signal comprises a third control signal, a fourth control signal, a fifth control signal, and a sixth control signal, and wherein the first switched-capacitor module comprises: the first switch, the second switch, the third switch, the fourth switch, the first capacitor, the second capacitor and the 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 with one end of the third capacitor, the other end of the third capacitor is connected with the ground terminal, and the second end of the first switch is connected with 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, the second end of the second switch is connected with the first end of the third switch and one end of the second capacitor, and the other end of the second capacitor is connected with the ground end;

a second end of the third switch is connected with the other end of the first capacitor and a first end of the fourth switch, and a second end of the fourth switch is connected with a ground terminal;

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

a first end of the fifth switch is an input end of the second switched capacitor module, the first end of the fifth switch is connected with one end of the sixth capacitor, the other end of the sixth capacitor is connected with a ground terminal, and a second end of the fifth switch is connected with the first end of the sixth switch and one end of the fourth capacitor;

a second end of the sixth switch is an output end of the second switched capacitor module, the second end of the sixth switch is connected with a first end of the seventh switch and one end of the fifth capacitor, and the other end of the fifth capacitor is connected with a ground end;

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

the seventh control signal is input to the control terminal of the fifth switch, the eighth control signal is input to the control terminal of the sixth switch, the ninth control signal is input to the control terminal of the seventh switch, and the tenth control signal is input to the control terminal of the eighth switch.
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 is the same as the fifth control signal, 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 is the same as the ninth control signal, 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 both the preset ratio and have complementary waveforms.
A wireless charging circuit is characterized by comprising a voltage boosting module, a voltage reducing module and a direct connection module which are connected in parallel, wherein,

the boost module is used for receiving a first alternating current signal and converting an input voltage of the wireless charging circuit into a first output voltage, and the first output voltage is higher than the input voltage;

the voltage reduction module is used for receiving a second alternating current signal and converting 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 direct connection module is configured to receive a third alternating current signal and convert an input voltage of the wireless charging circuit into a third output voltage, where the third output voltage is equal to the input voltage.
The wireless charging circuit of 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, the method comprising:

acquiring a battery voltage of a battery module of a terminal, wherein the battery module comprises one or more batteries;

determining a reference voltage according to the battery voltage, wherein the reference voltage value is N times of the battery voltage value, and N is greater than or equal to 1;

sending a first alternating current signal to a wireless charging device, wherein the first alternating current signal is used for instructing the wireless charging device to adjust the output voltage of the wireless charging device to the reference voltage;

sending a first control signal to a first switched capacitor module, wherein the first control signal is used for instructing the first switched capacitor module to convert the input voltage of the first switched capacitor module into a first output voltage;

and sending a second control signal to a second switched capacitor module, wherein the second control signal is used for indicating the second switched capacitor module to convert the first output voltage into a second output voltage, the second output voltage value is 1/N of the reference voltage value, and the second output voltage is used for supplying power to the battery module.
The wireless charging control method of claim 8, wherein if the reference voltage is 4 times the battery voltage, the first output voltage is 1/2 times the input voltage, and the second output voltage is 1/2 times the first output voltage; if the reference voltage is 2 times the battery voltage, the first output voltage is equal to the input voltage, and the second output voltage is 1/2 times the first output voltage.
The wireless charge control method according to claim 8, wherein if the battery module includes a plurality of batteries, the intermediate output voltage is equal to the dc output voltage and the target output voltage is equal to the intermediate output voltage if the reference voltage is equal to the battery voltage.
The wireless charging control method according to any one of claims 8 to 10, wherein the method further comprises:

acquiring the charging current of the battery module;

if the charging current is determined to be smaller than the first preset current, sending a second alternating current signal to the wireless charging device, wherein the second alternating current signal is used for indicating the wireless charging device to increase the output voltage of the wireless charging device by a first preset voltage;

and if the charging current is determined to be larger than a second preset current, sending a third alternating current signal to the wireless charging device, wherein the third alternating current signal is used for indicating the wireless charging device to reduce the output voltage of the wireless charging device by a first preset voltage.
The wireless charging control method according to any one of claims 8 to 11, wherein the determining a reference voltage from the battery voltage includes:

determining the reference voltage according to the battery voltage and parameters of a power adapter; the parameter of the power adapter comprises a voltage, a current, or a power of the power adapter.
The wireless charging control method of any one of claims 8-12, wherein the wireless charging device comprises a power adapter and a wireless base, and wherein sending the first ac signal to the wireless charging device comprises:

and sending the first alternating current signal to a power adapter or sending the first alternating current signal to a wireless base.
A computer storage medium having computer program code stored therein, which when run on a processor causes the processor to perform the wireless charging control method according to any one of claims 8-13.
A terminal, characterized in that the terminal comprises a processor and a charging circuit according to any of claims 1-5, the processor being configured to perform the wireless charging control method according to any of claims 8-13.