CN115842382A

CN115842382A - Charging circuit, method, apparatus, and computer-readable storage medium

Info

Publication number: CN115842382A
Application number: CN202111098050.4A
Authority: CN
Inventors: 徐鑫勇; 张俊; 陈锐; 郑毅成; �田�浩
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2021-09-18
Filing date: 2021-09-18
Publication date: 2023-03-24
Also published as: WO2023040548A1

Abstract

The present application relates to a charging circuit, a method, a device and a computer readable storage medium. A charging circuit, comprising: the switching circuit, the control circuit and the first switching tube circuit. The conversion circuit is used for converting alternating current provided by the wireless transmitting end into direct current. The control circuit is used for controlling the first switching tube circuit to be conducted when the charging power is larger than a preset power value in a wireless charging scene, so that the first switching tube circuit reduces the voltage of the direct current and charges a battery of the device to be charged at a constant current. By adopting the circuit, the voltage reduction can be realized through the switching tube circuit to charge the battery core, so that the charging cost of the equipment is reduced.

Description

Charging circuit, method, apparatus, and computer-readable storage medium

Technical Field

The present application relates to the field of charging technologies, and in particular, to a charging circuit, a charging method, a charging device, and a computer-readable storage medium.

Background

Along with the continuous promotion of terminal equipment configuration, terminal equipment becomes bigger and bigger to the demand and the consumption of electric quantity, compares in wired charging, and wireless charging is more nimble, has removed the constraint of wire rod simultaneously from, and consequently, more and more equipment support wireless charging function. In order to shorten the charging time, many fast charging schemes appear, and in some high-power fast charging schemes, a charge pump can be used for reducing the voltage to charge the battery cell, but the cost of the charge pump is high, so that the charging cost of the equipment is high.

Disclosure of Invention

The embodiment of the application provides a charging circuit, a charging method, charging equipment and a computer-readable storage medium, which can realize voltage reduction to charge a battery cell through a switching tube circuit, thereby reducing the charging cost of the equipment.

A charging circuit, comprising: the switching circuit, the control circuit and the first switching tube circuit.

The conversion circuit is used for converting alternating current provided by the wireless transmitting end into direct current.

The control circuit is used for controlling the first switching tube circuit to be conducted when the charging power is larger than a preset power value in a wireless charging scene, so that the first switching tube circuit reduces the voltage of the direct current and charges a battery of the device to be charged at a constant current.

An apparatus comprises the charging circuit.

A method of charging, the method comprising:

and converting the alternating current provided by the wireless transmitting end into direct current.

In a wireless charging scene, when the charging power is larger than a preset power value, the battery of the equipment to be charged is charged in a constant current mode after the direct current is reduced through the first switching tube circuit.

An electronic device comprising a memory and a processor, the memory storing a computer program, the processor implementing the following steps when executing the computer program:

and converting the alternating current provided by the wireless transmitting terminal into direct current.

In a wireless charging scene, when the charging power is larger than a preset power value, the battery of the equipment to be charged is charged at constant current after the direct current is reduced through the first switching tube circuit.

A computer-readable storage medium, on which a computer program is stored which, when executed by a processor, carries out the steps of:

The charging circuit, the method, the device and the computer readable storage medium are provided. The charging circuit is provided with a conversion circuit, a control circuit and a first switching tube circuit. The conversion circuit is used for converting alternating current provided by the wireless transmitting end into direct current; and the control circuit is used for controlling the first switching tube circuit to be switched on when the charging power is greater than a preset power value in a wireless charging scene so as to enable the first switching tube circuit to reduce the voltage of the direct current and then charge the battery of the equipment to be charged in a constant current mode. Therefore, the first switch circuit replaces a charge pump in the charging circuit provided by the embodiment of the application to realize the voltage reduction of the direct current, so that the charging circuit can charge the battery of the device to be charged with the constant current, thereby ensuring the charging efficiency and reducing the charging cost of the device.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic diagram of a charging system in one embodiment;

FIG. 2 is a schematic diagram of an embodiment of a charging circuit;

FIG. 3 is a schematic diagram of an embodiment of a charging circuit;

FIG. 4 is a schematic diagram of an embodiment of a charging circuit;

FIG. 5 is a schematic diagram of an embodiment of a charging circuit;

FIG. 6 is a schematic diagram of an embodiment of a charging circuit;

FIG. 7 is a schematic diagram of an embodiment of a charging circuit;

FIG. 8 is a schematic diagram of an embodiment of a charging circuit;

FIG. 9 is a schematic diagram of an embodiment of a charging circuit;

FIG. 10 is a schematic diagram of an embodiment of a charging circuit;

FIG. 11 is a schematic diagram of an embodiment of a charging circuit;

FIG. 12 is a schematic path diagram of a first charging mode in accordance with one embodiment;

FIG. 13 is a schematic diagram of a second charging mode according to an embodiment;

FIG. 14 is a schematic diagram of a third charging mode according to an embodiment;

FIG. 15 is a schematic diagram of a fourth charging mode according to an embodiment;

FIG. 16 is a flow chart diagram illustration of a charging method in one embodiment;

fig. 17 is a block diagram showing the configuration of an electronic apparatus in one embodiment.

Element number description:

a charging system: 1; the equipment to be charged: 10; the wireless charging device: 20; the wireless transmitting terminal: 21; a conversion circuit: 011; the control circuit: 012; the first switching tube circuit: 013; the second switching tube circuit: 309; the third switching tube circuit: 308; a battery: 02; full-bridge rectifier circuit: 301; a receiving coil: 302; capacitance: 303; voltage stabilizing circuit: 304; the detection circuit: 305; a booster circuit: 306; wired charging port: 307; a first switching tube: q5; a second switching tube: q6; a third switching tube: q9; a fourth switching tube: q10; a fifth switching tube: q7; a sixth switching tube: and Q8.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

It will be understood that, as used herein, the terms "first," "second," and the like may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another. For example, a first client may be referred to as a second client, and similarly, a second client may be referred to as a first client, without departing from the scope of the present application. Both the first client and the second client are clients, but they are not the same client.

In order to enable those skilled in the art to better understand the technical solution provided by the embodiment of the present application, an application scenario of the charging circuit is described below, where the charging circuit may be deployed in an electronic device, and the charging circuit is described by taking the electronic device as a mobile phone as an example.

Referring to fig. 1, the figure is a schematic diagram of a charging system 1 provided in an embodiment of the present application. The charging system 1 includes a device to be charged 10 and a wireless charging device 20. For example, the device to be charged 10 may be the cell phone 10 shown in fig. 1, and the wireless charging device 20 may be the wireless charger 20 shown in fig. 1; the wireless charger 20 is used for wirelessly charging the mobile phone 10. The wireless charger 20 shown in fig. 1 supports the cellular phone 10 horizontally placed above it. In some embodiments, the wireless charger 20 may have other configurations, such as a vertical wireless charger with a certain inclination, so that the mobile phone 10 can lean against the wireless charger 20.

Fig. 2 is a schematic structural diagram of a charging circuit according to an embodiment of the present disclosure, where the charging circuit may be applied to the device to be charged 10 shown in fig. 1. The charging circuit 01 includes: a conversion circuit 011, a control circuit 012 and a first switching tube circuit 013; a conversion circuit 011 for converting the ac power provided by the wireless transmitter 21 into dc power; the control circuit 012 is configured to, in a wireless charging scenario, control the first switching tube circuit 013 to be turned on when the charging power is greater than a preset power value, so that the first switching tube circuit 013 reduces the dc voltage and charges the battery 02 of the device 10 to be charged with a constant current.

It should be noted that, in the charging circuit provided in the embodiment of the present application, when high-power charging is considered, a problem that a cost is high when a battery cell is charged by using a charge pump to step down voltage is solved, and a function of the charge pump is replaced with the first switching tube circuit 013 in the charging circuit. The principle of the method is that with the continuous increase of the electric quantity in the battery 02, the difference between the input voltage and the output voltage of the first switching tube circuit 013 is continuously reduced, and under the condition that the impedance in the first switching tube circuit 013 is not changed, the output current of the first switching tube circuit 013 is reduced accordingly, so that the charging efficiency is lower and lower. In order to ensure the charging efficiency of the battery 02, the control circuit 012 performs constant current charging on the battery 02 of the device to be charged 10 by controlling the first switching tube circuit 013 to step down the direct current. Thereby, the cost of the charging circuit is reduced while the charging efficiency of the battery 02 is ensured.

For example, the control Circuit 012 may be Integrated in a receiving Integrated Circuit (RX IC) chip, or may be Integrated outside the RX IC chip.

For example, when the control circuit 012 is integrated in an RX IC chip, the control circuit 012 may be a digital core of a digital operation unit in the RX IC chip; when the control circuit 012 is integrated outside the RX IC chip, the control circuit 012 may be a Central Processing Unit (CPU) or other external control chip.

For example, in a case that the control circuit 012 and the first switching tube circuit 013 are integrated in the RX IC chip, the control circuit 012 may be directly connected to the first switching tube circuit 013, so that the control circuit 012 controls the first switching tube circuit 013 to be turned on or turned off.

In a case where the control circuit 012 is integrated outside the RX IC chip and is an independent module, and the first switch tube circuit 013 is integrated in the RX IC chip, the control circuit 012 may be connected to a pin corresponding to an I/O port of the RX IC chip, so as to control the first switch tube circuit 013 by the control circuit 012.

When the control circuit 012 and the first switching tube circuit 013 are integrated outside the RX IC chip and the control circuit 012 and the first switching tube circuit 013 are independent modules, the control circuit 012 can be directly connected to the first switching tube circuit 013 to control the first switching tube circuit 013 by the control circuit 012.

When the control circuit 012 is integrated in the RX IC chip and the first switching tube circuit 013 is integrated outside the RX IC chip and is an independent module, the first switching circuit is connected to a pin corresponding to an I/O port of the RX IC chip, so that the control circuit 012 controls the first switching tube circuit 013.

Optionally, the first switching tube circuit 013 includes at least one switching tube, where the switching tube may be a triode. At least one of the switching tubes may be connected in series to form a first switching tube circuit 013.

In one implementation, the control circuit 012 adjusts the impedance of the first switch tube circuit 013 by adjusting the starting voltage of the switch tube to adjust the impedance of the switch tube.

In one embodiment, the control circuit 012 obtains the output voltage of the first switching transistor circuit 013, and determines the output current of the first switching transistor circuit 013 according to the output voltage. Then, determining a difference value between the output current and the set current; and determining the required impedance value of the first switching tube circuit 013 according to the difference value. Finally, the starting voltage of each switching tube is determined through the impedance value. The control circuit 012 can directly or directly output the voltage of the first switching tube circuit 013; alternatively, a voltage feedback circuit is connected to the output terminal of the first switching transistor circuit 013, and the output voltage of the first switching transistor circuit 013 is detected by the voltage feedback circuit and fed back to the control circuit 012. The embodiments of the present application do not limit this.

In the second embodiment, a set of control logic may be designed in advance so that the control circuit automatically controls the output current of the first switching tube circuit according to the control logic, for example, the control circuit 012 may set in advance the impedance value of the first switching tube circuit 013 corresponding to different charging powers of the battery 02. In practical applications, the control circuit 012 obtains the charging power in the battery 02 in real time, determines the impedance value of the first switch tube circuit 013 corresponding to the electric quantity, and adjusts the impedance in the first switch tube circuit 013 according to the impedance value, so as to realize constant current output.

Illustratively, the type of battery 02 may be any of lead-acid battery 02, nickel-metal hydride battery 02, sodium-sulfur battery 02, flow battery 02, super capacitor 303, camry battery 02, and flexible battery 02. Battery 02 includes dual cells.

In addition, the control circuit 012 controls the first switching tube circuit 013 to be turned on and adjusts the impedance of the first switching tube circuit 013 in a wireless charging scenario, mainly in order to step down the dc power of the first switching tube circuit 013 to charge the battery 02 of the device to be charged with a constant current in a case of high power. The high power refers to a larger power output by the charging circuit, and generally, the power range corresponding to the high power is, for example, 40W to 50W, which is not limited in this embodiment.

In one implementation, the conversion Circuit 011, the control Circuit 012 and the first switch tube Circuit 013 can be Integrated in a receiving Integrated Circuit (RX IC) chip. The control circuit 012 and the first switching tube circuit 013 may be integrated outside the RX IC chip, which is not limited in this embodiment of the application.

Optionally, the conversion circuit 011 may include the MOS transistor Q1, the MOS transistor Q2, the MOS transistor Q3, and the MOS transistor Q4 shown in fig. 3. The MOS transistor in the conversion circuit 011 can be replaced by a diode. Specifically, the source electrode of the MOS transistor Q1 is connected to the drain electrode of the MOS transistor Q3; the drain electrode of the MOS tube Q1 is connected with the drain electrode of the MOS tube Q2; the source electrode of the MOS tube Q3 is connected with the source electrode of the MOS tube Q4; the source electrode of the MOS tube Q2 is connected with the drain electrode of the MOS tube Q4; the sources of the MOS transistor Q3 and the MOS transistor Q4 are grounded. In practice, the MOS transistor Q1, the MOS transistor Q2, the MOS transistor Q3, and the MOS transistor Q4 constitute a full-bridge rectifier circuit 301.

In this embodiment, a conversion circuit 011, a control circuit 012 and a first switching tube circuit 013 are provided in the charging circuit, and the conversion circuit 011 converts the ac power provided by the wireless transmitting terminal 21 into dc power; in a wireless charging scenario, when the charging power is greater than a preset power value, the control circuit 012 controls the first switching tube circuit 013 to be turned on, so that the first switching tube circuit 013 reduces the dc voltage and charges the battery 02 of the device 10 to be charged with a constant current. Therefore, in the charging circuit provided by the embodiment of the application, the first switch circuit replaces a charge pump to reduce the direct current, so that the charging circuit can charge the battery 02 of the device to be charged 10 with a constant current, thereby ensuring the charging efficiency and reducing the charging cost of the device.

In one embodiment, the control circuit 012 is configured to control the first switching tube circuit 013 to be turned on and adjust the impedance of the first switching tube circuit 013, so that the first switching tube circuit 013 reduces the dc voltage to charge the battery 02 of the device to be charged with a constant current in a wireless charging scenario.

In the embodiment of the present application, the principle of adjusting the impedance of the first switching tube circuit 013 is as follows: as the amount of electricity in the battery 02 increases, the difference between the input voltage and the output voltage of the first switching tube circuit 013 decreases, and the output current of the first switching tube circuit 013 decreases with the same impedance in the first switching tube circuit 013. In order to ensure the charging efficiency of the battery 02, the impedance in the first switching tube circuit 013 is adjusted to realize the voltage reduction and current increase effects on the direct current output by the first switching tube circuit 013, so that the constant current charging of the battery 02 of the device to be charged 10 is ensured. Thus, the cost of the charging circuit is reduced while the charging efficiency of the battery 02 is ensured.

In this embodiment, the control circuit 012 reduces the dc voltage by adjusting the impedance of the first switching tube circuit 013, so that the charging circuit can charge the battery 02 of the device to be charged with a constant current, thereby reducing the charging cost of the device while ensuring the charging efficiency.

Optionally, referring to fig. 4, the first switching tube circuit 013 includes a first switching tube Q5 and a second switching tube Q6, and the first switching tube Q5 and the second switching tube Q6 are connected in a back-to-back manner.

The first switching tube circuit 013 in this embodiment includes the first switching tube Q5 and the second switching tube Q6 that are connected in a back-to-back manner, and when the first switching tube circuit 013 is not required to be turned on, the first switching tube Q5 and the second switching tube Q6 can be turned off in two directions to the first switching tube circuit 013, and the situation of reverse leakage of the first switching tube circuit 013 is prevented.

Further, the first switch tube Q5 and the second switch tube Q6 are both MOS tubes.

It should be noted that the MOS transistor is an abbreviation of MOSFET. A MOSFET Metal-Oxide Semiconductor Field Effect Transistor (MOSFET) is a Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET) for short. Illustratively, the MOS transistor may be a silicon carbide MOS transistor.

Specifically, referring to fig. 4, the back-to-back connection mode when the first switching tube Q5 and the second switching tube Q6 are MOS tubes is as follows: the source electrode of the first switch tube Q5 is connected with the source electrode of the second switch tube Q6.

The embodiment of the application adopts the back-to-back MOS tubes to reduce the heat generated when the battery 02 is charged, and can also realize the constant current charging of the battery 02.

In one embodiment, when there is a higher requirement for the size of the charging circuit, the first switching tube Q5 and the second switching tube Q6 may be replaced by gallium nitride switching tubes. Therefore, the first switch tube circuit 013 includes a gallium nitride switch tube.

It should be noted that, by using the gallium nitride switching tube instead of the first switching tube Q5 and the second switching tube Q6, the first switching tube Q5 and the second switching tube Q6 have the advantage of small size compared to the first switching tube Q5 and the second switching tube Q6 on the basis of realizing the related functions of the first switching tube Q5 and the second switching tube Q6.

In this embodiment, the size of the charging circuit can be reduced by using the gallium nitride switch for the first switching transistor circuit 013.

In one embodiment, the control circuit 012 is configured to control a gate voltage of the first switching transistor circuit 013, so as to adjust an impedance of the first switching transistor circuit 013.

In practical applications, when the first switching transistor circuit 013 includes the first switching transistor Q5 and the second switching transistor Q6, when the gate voltages of the first switching transistor Q5 and the second switching transistor Q6 are changed, the amount of charges induced in the channel is also changed, and the width of the conducting channel is also changed, so that the drain current is changed along with the change of the gate voltage.

For example, in the case that the first switching tube Q5 and the second switching tube Q6 are MOS tubes, the first end of the control circuit 012 is connected to the gate of the first switching tube Q5 and the gate of the second switching tube Q6 at the same time; the control circuit 012 is specifically configured to output a driving voltage through a first end, turn on the first switching tube Q5 and the second switching tube Q6, and control impedances in the first switching tube Q5 and the second switching tube Q6 through different driving voltages, so that a current output by the second switching tube Q6 is a constant current. Similarly, the description of the first switching transistor circuit 013 including the gan switch can refer to the above description, and thus is not repeated herein.

In this embodiment, the control circuit 012 controls the gate voltage of the first switching tube circuit 013 to adjust the impedance of the first switching tube circuit 013, so that the first switching tube circuit 013 reduces the dc voltage and then charges the battery 02 of the device to be charged with a constant current.

In one implementation, referring to fig. 5, the charging circuit of the embodiment of the present application further includes a detection circuit 305. Specifically, the detection circuit 305 is configured to detect an output current of the first switching tube circuit 013; the control circuit 012 is configured to adjust the impedance of the first switching tube circuit 013 according to the output current of the first switching tube circuit 013.

Further, the detection circuit 305 is a CC feedback circuit.

In this embodiment, the detection circuit 305 detects the output current of the first switching tube circuit 013 and feeds the detected output current back to the control circuit 012; the control circuit 012 performs voltage reduction processing on the gate voltages of the first switching tube Q5 and the second switching tube Q6 to increase impedances in the first switching tube Q5 and the second switching tube Q6 under the condition that it is determined that the output current of the first switching tube circuit 013 is less than a preset constant current, so as to reduce the output voltage of the first switching tube circuit 013 and increase the output current of the first switching tube circuit 013, thereby implementing constant current charging of the battery 02 of the device to be charged 10.

In one embodiment, referring to fig. 6, the charging circuit further includes: a boost circuit 306. Specifically, the first switching tube circuit 013 is configured to, in a wireless charging scenario, turn off when the charging power is smaller than a preset power value; the boosting circuit 306 is configured to start when the charging power is smaller than a preset power value, boost the direct current, and provide the boosted direct current to the battery 02.

In one implementation, the voltage boosting circuit 306 may be controlled by the control circuit 012, or may be directly controlled by a processor in the electronic device.

Alternatively, the boost circuit 306 may include a charge circuit. The battery 02 that this application embodiment adopted is two electric core battery 02. When the output voltage of the conversion circuit 011 is low, a boosting operation is required for the output voltage of the conversion circuit 011 by the charger circuit. The charge circuit may be integrated in the RX IC, or may be provided outside the RX IC.

In this embodiment, in a wireless charging scenario, when the output voltage of the charging circuit is considered to be low, and the charging power is smaller than the preset power value, the boost circuit 306 is started when the charging power is smaller than the preset power value, so as to boost the direct current, and provide the boosted direct current to the battery 02. In order to improve the efficiency of charging the battery 02.

In one embodiment, the voltage boost circuit 306 is further configured to turn off when the charging power is greater than a preset power value.

Illustratively, when charging battery 02 of device 10 to be charged via boost circuit 306, charging battery 02 of device 10 to be charged is primarily for medium-low power situations. The low power refers to that the charging circuit outputs smaller power, and the power range corresponding to the low power is generally below 15W; the medium power is a power output by the charging circuit between high power and low power, and the charging power corresponding to the medium power is, for example, 20W to 30W.

In this embodiment, the boosting circuit 306 is turned off when the charging power is greater than the preset power value, thereby preventing the battery 02 of the device to be charged 10 from being charged through the boosting circuit 306, and improving the charging efficiency of the battery 02 when the charging power is greater than the preset power value.

In one embodiment, referring to fig. 7, the charging circuit further includes: a coil 302 is received. Specifically, the receiving coil 302 is configured to receive an electromagnetic signal sent by the wireless transmitting terminal 21, and generate an alternating current according to the electromagnetic signal; the inductance of the receiving coil 302 is less than a preset inductance threshold; the conversion circuit 011 is used for rectifying and boosting alternating current to output direct current.

For example, current wireless charging schemes all use a receive coil 302 with an inductance of 8-9 uH. The inductance of the receiving coil 302 of the present application is reduced from that of the conventional receiving coil 302, and may be, for example, 3 to 5uH.

Referring to fig. 7, a first end of the receiving coil 302 is connected to a common terminal between the MOS transistors Q2 and Q4.

In one implementation, referring to fig. 8, the switching circuit 011 further includes a capacitor 303, a first terminal of the capacitor 303 being connected to a second terminal of the receiving coil 302; a second terminal of the capacitor 303 is connected to a common terminal between the MOS transistors Q1 and Q3. When the full-bridge rectifier circuit 301 included in the conversion circuit 011 boosts the dc power, the operation mode is a half-bridge voltage-doubling mode. Specifically, in a time period in which the switching circuit 011 boosts the dc power, the control circuit 012 can control the MOS transistor Q2 to be in the off state all the time in the time period. For example, the control circuit 012 controls the MOS transistor Q2 to be turned off during this period, and the full-bridge rectifier circuit 301 may be equivalent to a half-bridge rectifier circuit. When the output of the receiving coil 302 is at a low level, the MOS transistor Q1 is controlled to be turned off, the MOS transistor Q3 is controlled to be turned on, and the capacitor 303 is charged. When the output of the receiving coil 302 is at a low level, the MOS transistor Q1 is controlled to be turned on, the MOS transistor Q3 is controlled to be turned off, and the capacitor 303 is charged, so that the direct current is boosted.

In this embodiment, the charging circuit realizes thinning and miniaturization of the receiving coil 302 by using the receiving coil 302 having an inductance smaller than a preset inductance threshold, thereby reducing loss and heat generation of the receiving coil 302. Consider the problem of a decrease in the output voltage of the charging circuit due to a decrease in the inductance of the receiving coil 302. According to the embodiment of the application, when the alternating current is converted into the direct current through the conversion circuit 011, the direct current is boosted. Thereby making up for the problem that the output voltage of the charging circuit is low due to the decrease of the inductance value of the receiving coil 302.

In one embodiment, referring to fig. 9, the charging circuit further includes: a stabilizing circuit 304. Specifically, the input end of the voltage stabilizing circuit 304 is connected to the output end of the converting circuit 011, and the output end of the voltage stabilizing circuit 304 is connected to the first switching tube circuit 013; and the voltage stabilizing circuit 304 is used for stabilizing the direct current output by the conversion circuit 011.

Alternatively, the control circuit 012 may monitor the input voltage of the regulator circuit 304, or may monitor the output voltage of the regulator circuit 304. Wherein, the output voltage of the voltage stabilizing circuit 304 is equal to the input voltage of the first switching tube circuit 013.

In this embodiment, the dc power output from the conversion circuit 011 is stabilized by the voltage stabilizing circuit 304. So that a stable voltage is applied to the input of the first switching transistor circuit 013.

In one embodiment, referring to fig. 10, the charging circuit further includes: a second switching tube circuit 309; specifically, the first switching tube circuit 013 is further configured to be turned on in a wired charging scenario when the charging power is smaller than a preset power value; the second switching tube circuit 309 is configured to be turned on when the charging power is smaller than the preset power value, and transmit the direct current received by the wired charging port 307 to the first switching tube circuit 013, so that the first switching tube circuit 013 reduces the direct current and charges the battery 02 of the device to be charged with a constant current.

For example, the second switching tube circuit 309 may be controlled to be turned on and off by a digital circuit, the CPU in the electronic device may also be used to control the second switching tube circuit 309 to be turned on and off, or a control unit in another chip may also be used to control the second switching tube circuit 309 to be turned on and off, which is not limited in the embodiment of the present application.

Specifically, in conjunction with fig. 10, the second switching tube circuit 309 includes the third switching tube Q9 and the fourth switching tube Q10 shown in fig. 10. The third switching tube Q9 and the fourth switching tube Q10 are connected in a back-to-back manner. The third switching tube Q9 and the fourth switching tube Q10 are both MOS tubes. The third switching transistor Q9 is specifically a MOS transistor Q9 shown in fig. 3, and the fourth switching transistor Q10 is specifically a MOS transistor Q10 shown in fig. 10.

Illustratively, when a digital circuit or a control unit in the CPU or another chip is used to control the on and off of the third switching tube circuit 309, the digital circuit or the control unit in the CPU or another chip connects the gates of the third switching tube Q9 and the fourth switching tube Q10, and the digital circuit or the control unit in the CPU or another chip controls the on and off of the second switching tube circuit 309 by controlling the gate voltages of the third switching tube Q9 and the fourth switching tube Q10.

In this embodiment, in a wired charging scenario, when the charging power is smaller than a preset power value, the second switching tube circuit 309 is turned on, and the control circuit 012 controls the first switching tube circuit 013 to be turned on and adjusts the impedance of the first switching tube circuit 013. After the second switching tube circuit 309 is turned on, the direct current received by the wired charging port 307 can be transmitted to the first switching tube circuit 013, and the control circuit 012 adjusts the impedance of the first switching tube circuit 013, so that the first switching tube circuit 013 reduces the direct current and then charges the battery 02 of the device 10 to be charged with a constant current, thereby improving the charging efficiency of the battery 02.

In one embodiment, referring to fig. 11, the charging circuit further includes: a third switching transistor circuit 308; the first switching tube circuit 013 is further configured to be turned off when the charging power is greater than a preset power value in a wired charging scenario; a second switching tube circuit 309, configured to turn off when the charging power is greater than a preset power value; and the third switching tube circuit 308 is configured to be turned on when the charging power is greater than the preset power value, and charge the battery 02 according to the direct current received by the wired charging port 307.

For example, the digital circuit may control the on/off of the third switching transistor circuit 308, the CPU in the electronic device may control the on/off of the third switching transistor circuit 308, or a control unit in another chip may also control the on/off of the third switching transistor circuit 308, which is not limited in this embodiment of the application.

Specifically, in conjunction with fig. 11, the third switching tube circuit 308 includes a fifth switching tube Q7 and a sixth switching tube Q8 shown in fig. 11. The fifth switching tube Q7 and the sixth switching tube Q8 are connected in a back-to-back manner. The third switching tube Q9 and the fourth switching tube Q10 are both MOS tubes. For example, the fifth switching transistor Q7 is a MOS transistor Q7 shown in fig. 3, and the sixth switching transistor Q8 is a MOS transistor Q8 shown in fig. 11.

Illustratively, when a digital circuit or a control unit in a CPU or other chip is used to control the on and off of the third switching tube circuit 308, the digital circuit or the control unit in the CPU or other chip connects the gates of the fifth switching tube Q7 and the sixth switching tube Q8, and the digital circuit or the control unit in the CPU or other chip controls the on and off of the third switching tube circuit 308 by controlling the gate voltages of the fifth switching tube Q7 and the sixth switching tube Q8.

In this embodiment, in a wired charging scenario, when the charging power is greater than a preset power value, the third switching tube circuit 308 is turned on, the second switching tube circuit 309 is turned off, and the control circuit 012 controls the first switching tube circuit 013 to be turned off. On this basis, the triac circuit is caused to charge the battery 02 according to the direct current received by the wired charging port 307. Thereby realizing the quick charge of the battery 02.

It can be understood that the charging circuit provided in the embodiment of the present application actually includes four charging modes, where a wireless charging scenario includes two charging modes; two modes are included in the wired charging scenario. Specifically, referring to fig. 12, for a first charging mode in a wireless charging scenario, the first charging path 41 shown in fig. 12 is used to charge the battery 02; for the second charging mode in the wireless charging scenario, the battery 02 is charged using the second charging path 42 shown in fig. 13; for the first charging mode in the wired charging scenario, the battery 02 is charged using the third charging path 43 shown in fig. 14; for the second charging mode in the wired charging scenario, the fourth charging path 44 shown in fig. 15 is employed to charge the battery 02.

It should be noted that, the first charging mode in the wireless charging scenario is applied to charging with a charging power greater than a preset power value; the second charging mode in the wireless charging scene is applied to charging with the charging power smaller than the preset power value; a first charging mode in a wired charging scene is applied to charging with the charging power smaller than a preset power value; the second charging mode in the wired charging scenario is applied to charging with a charging power greater than a preset power value.

Specifically, the receiving coil 302, the capacitor 303, the full-bridge rectifier circuit 301, the voltage regulator circuit 304, and the first switching tube circuit 013 shown in fig. 12 constitute the first charging path 41; the second charging path 42 is constituted by the receiving coil 302, the capacitor 303, the full-bridge rectifier circuit 301, the voltage regulator circuit 304, and the booster circuit 306 shown in fig. 13; the third charging path 43 is formed by the wired charging port 307, the second switching tube circuit 309, and the first switching tube circuit 013 shown in fig. 14; the wired charging port 307 and the third switching tube circuit 308 shown in fig. 15 constitute the fourth charging path 44.

Referring to fig. 16, an embodiment of the present application further provides a charging method, where the method includes:

s11, converting the alternating current provided by the wireless transmitting terminal 21 into direct current.

And S12, in a wireless charging scene, when the charging power is greater than a preset power value, the battery 02 of the device to be charged 10 is subjected to constant-current charging after the direct current is reduced through the first switching tube circuit 013.

In one embodiment, the constant-current charging of the battery 02 of the device to be charged 10 after the dc voltage is reduced by the first switching tube circuit 013 includes: acquiring the output current of a first switching tube circuit 013; the impedance of the first switching tube circuit 013 is adjusted according to the output current of the first switching tube circuit 013, so that the battery 02 of the device to be charged 10 is charged with a constant current after the direct current is reduced.

In one embodiment, the charging method of the embodiment of the present application further includes: in a wireless charging scenario, when the charging power is smaller than a preset power value, the first switching tube circuit 013 is controlled to be turned off, the direct current is boosted through the boost circuit 306, and the boosted direct current is provided to the battery 02.

In one embodiment, the charging method of the embodiment of the present application further includes: in a wired charging scene, when the charging power is smaller than a preset power value, the first switching tube circuit 013 and the second switching tube circuit 309 are conducted, and the impedance of the first switching tube circuit 013 is adjusted; the direct current received by the wired charging port 307 is transmitted to the first switching tube circuit 013 through the second switching tube circuit 309, and the battery 02 of the device to be charged 10 is charged with a constant current after the direct current is stepped down through the impedance of the first switching tube circuit 013.

In one embodiment, the charging method of the embodiment of the present application further includes: in a wired charging scene, when the charging power is greater than a preset power value, the first switching tube circuit 013 and the second switching tube circuit 309 are turned off, and the third switching tube circuit 308 is turned on; the battery 02 is charged through the third switching tube circuit 308 according to the direct current received by the wired charging port 307.

It should be noted that for specific descriptions and beneficial effects of the charging method provided in the embodiments of the present application, reference may be made to the embodiments of the charging circuit, and details are not described herein again.

It should be understood that, although the steps in the flowchart of fig. 16 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least a portion of the steps in fig. 16 may include multiple sub-steps or multiple stages that are not necessarily performed at the same time, but may be performed at different times, and the order of performance of the sub-steps or stages is not necessarily sequential, but may be performed in turn or alternately with other steps or at least a portion of the sub-steps or stages of other steps.

Fig. 17 is a schematic diagram of an internal structure of an electronic device in one embodiment. The electronic device may be any terminal device such as a mobile phone, a tablet computer, a notebook computer, a desktop computer, a PDA (Personal Digital Assistant), a POS (Point of Sales), a vehicle-mounted computer, and a wearable device. The electronic device includes a processor and a memory connected by a system bus. The processor may include one or more processing modules, among other things. The processor may be a CPU (Central Processing Unit), a DSP (Digital Signal processor), or the like. The memory may include a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The computer program can be executed by a processor for implementing a charging method provided in the following embodiments. The internal memory provides a cached execution environment for the operating system computer programs in the non-volatile storage medium.

The modules in the modulo operation circuit provided in the embodiment of the present application may be implemented in the form of a computer program. The computer program may be run on a terminal or a server. Program modules constituted by such computer programs may be stored on the memory of the electronic device. Which when executed by a processor, performs the steps of the method described in the embodiments of the present application.

The embodiment of the application also provides a computer readable storage medium. One or more non-transitory computer-readable storage media containing computer-executable instructions that, when executed by one or more processors, cause the processors to perform the steps of the charging method.

Embodiments of the present application also provide a computer program product containing instructions that, when run on a computer, cause the computer to perform a charging method.

Any reference to memory, storage, database, or other medium used herein may include non-volatile and/or volatile memory. The nonvolatile Memory may include a ROM (Read-Only Memory), a PROM (Programmable Read-Only Memory), an EPROM (Erasable Programmable Read-Only Memory), an EEPROM (Electrically Erasable Programmable Read-Only Memory), or a flash Memory. Volatile Memory can include RAM (Random Access Memory), which acts as external cache Memory. By way of illustration and not limitation, RAM is available in many forms, such as SRAM (Static Random Access Memory), DRAM (Dynamic Random Access Memory), SDRAM (Synchronous Dynamic Random Access Memory), double Data Rate DDR SDRAM (Double Data Rate Synchronous Random Access Memory), ESDRAM (Enhanced Synchronous Dynamic Random Access Memory), SLDRAM (Synchronous Link Dynamic Random Access Memory), RDRAM (Random Dynamic Random Access Memory), and DRmb DRAM (Dynamic Random Access Memory).

The above examples only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A charging circuit, comprising: the switching circuit, the control circuit and the first switching tube circuit;

the conversion circuit is used for converting alternating current provided by the wireless transmitting end into direct current;

the control circuit is used for controlling the first switching tube circuit to be conducted when the charging power is larger than a preset power value in a wireless charging scene, so that the first switching tube circuit reduces the voltage of the direct current and charges a battery of the equipment to be charged at a constant current.

2. The charging circuit of claim 1, wherein the first switching tube circuit comprises a first switching tube and a second switching tube, and the first switching tube and the second switching tube are connected in a back-to-back manner.

3. The charging circuit of claim 2, wherein the first switch tube and the second switch tube are both MOS tubes.

4. The charging circuit of claim 1, wherein the first switching tube circuit comprises a gallium nitride switching tube.

5. The charging circuit according to any one of claims 1 to 4, wherein the control circuit is configured to adjust the impedance of the first switching tube circuit when the first switching tube circuit is turned on, so that the first switching tube circuit steps down the direct current to charge the battery of the device to be charged with a constant current.

6. The charging circuit of claim 5, wherein the control circuit is configured to control a gate voltage of the first switching tube circuit to adjust an impedance of the first switching tube circuit.

7. The charging circuit according to any one of claims 1 to 4, further comprising:

the detection circuit is used for detecting the output current of the first switching tube circuit;

the control circuit is used for adjusting the impedance of the first switching tube circuit according to the output current of the first switching tube circuit.

8. The charging circuit of claim 1, further comprising: a boost circuit;

the first switching tube circuit is used for switching off when the charging power is smaller than the preset power value in a wireless charging scene;

the boost circuit is used for starting when the charging power is smaller than the preset power value so as to boost the direct current and provide the boosted direct current for the battery.

9. The charging circuit of claim 8, wherein the boost circuit is further configured to turn off when the charging power is greater than the preset power value.

10. The charging circuit of any of claims 1-4, further comprising: a receiving coil;

the receiving coil is used for receiving the electromagnetic signal sent by the wireless transmitting end and generating the alternating current according to the electromagnetic signal; the inductance of the receiving coil is smaller than a preset inductance threshold;

the conversion circuit is used for rectifying and boosting the alternating current to output the direct current.

11. The charging circuit of any one of claims 1-4, further comprising: the input end of the voltage stabilizing circuit is connected with the output end of the conversion circuit, and the output end of the voltage stabilizing circuit is connected with the first switching tube circuit;

and the voltage stabilizing circuit is used for stabilizing the direct current output by the conversion circuit.

12. The charging circuit of any of claims 1-4, further comprising: a second switching tube circuit;

the first switching tube circuit is also used for conducting in a wired charging scene when the charging power is smaller than the preset power value;

the second switching tube circuit is used for conducting when the charging power is smaller than the preset power value, and transmitting the direct current received by the wired charging port to the first switching tube circuit, so that the first switching tube circuit performs voltage reduction on the direct current and then performs constant current charging on a battery of the equipment to be charged.

13. The charging circuit of claim 12, further comprising: a third switching tube circuit;

the first switching tube circuit is further used for being turned off when the charging power is larger than the preset power value in a wired charging scene;

the second switching tube circuit is used for being turned off when the charging power is larger than the preset power value;

and the third switching tube circuit is used for conducting when the charging power is greater than the preset power value and charging the battery according to the direct current received by the wired charging port.

14. A device comprising a charging circuit as claimed in any one of claims 1 to 13.

15. A method of charging, the method comprising:

converting alternating current provided by a wireless transmitting end into direct current;

16. The charging method according to claim 15, wherein the constant-current charging of the battery of the device to be charged after the step-down of the direct current by the first switching tube circuit comprises:

acquiring the output current of the first switching tube circuit;

and adjusting the impedance of the first switching tube circuit according to the output current of the first switching tube circuit so as to realize constant-current charging of the battery of the equipment to be charged after the direct current is reduced.

17. The charging method according to claim 15, further comprising:

under a wireless charging scene, when the charging power is smaller than the preset power value, the first switching tube circuit is controlled to be turned off, the direct current is boosted through the boosting circuit, and the boosted direct current is provided for the battery.

18. The charging method according to any one of claims 15 to 17, further comprising:

in a wired charging scene, when the charging power is smaller than the preset power value, the first switching tube circuit and the second switching tube circuit are conducted, and the impedance of the first switching tube circuit is adjusted;

and the direct current received by the wired charging port is transmitted to the first switching tube circuit through the second switching tube circuit, and the battery of the equipment to be charged is charged at constant current after the direct current is reduced in voltage through the impedance of the first switching tube circuit.

19. The charging method of claim 18, further comprising:

in a wired charging scene, when the charging power is greater than the preset power value, the first switching tube circuit and the second switching tube circuit are closed, and a third switching tube circuit is conducted; and charging the battery through the third switching tube circuit according to the direct current received by the wired charging port.

20. An electronic device comprising a memory and a processor, the memory having stored thereon a computer program, characterized in that the computer program, when executed by the processor, causes the processor to carry out the steps of the method according to any of claims 15-19.

21. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method according to any one of claims 15-19.