CN114465311A

CN114465311A - Charging circuit, charging method, electronic device, and storage medium

Info

Publication number: CN114465311A
Application number: CN202210119832.XA
Authority: CN
Inventors: 郑毅成
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2022-02-08
Filing date: 2022-02-08
Publication date: 2022-05-10
Also published as: WO2023151364A1

Abstract

The charging circuit comprises a first charge pump and a second charge pump, wherein the first charge pump is provided with a first output end, and the first output end is connected with a first battery cell through a first passage so as to provide charging current for the first battery cell through the first passage; a second charge pump having a second output connected to a second cell through a second path to provide a charging current to the second cell through the second path, wherein a path impedance of the second path is greater than a path impedance of the first path; and the control circuit is used for controlling the voltage of the first output end in the process of charging the first battery cell by using the first charge pump so as to enable the charging currents of the first path and the second path to be matched.

Description

Charging circuit, charging method, electronic device, and storage medium

Technical Field

The present disclosure relates to the field of charging technologies, and more particularly, to a charging circuit, a charging method, an electronic device, and a storage medium.

Background

At present, the parallel double-core technology is widely applied to electronic equipment such as special-shaped mobile phones, folding screen mobile phones and the like. In the related art, a charging chip based on a charge pump is widely used for charging the parallel-connected battery cells. In such an electronic device, since one of the cells and the charging chip are connected through a Flexible Printed Circuit (FPC), there is a path impedance of several tens of m Ω, resulting in a non-uniform path impedance between the two cells. This impedance disparity can result in large differences in the charging current and charging efficiency of the two cells.

In order to solve the above problem, in the related art, a load switch is artificially added to a path having a small impedance, and the impedances of the two cells are adjusted to match the path impedances of the two cells. However, when the method is applied to a large-current charging mode, large heat loss is caused; in addition, adding a load switch to the charging circuit would result in additional cost increases.

Disclosure of Invention

In view of the above, the present application provides a charging circuit, a charging method, an electronic device and a storage medium to solve the above problems.

In a first aspect, a charging circuit is provided, including: the first charge pump is provided with a first output end, and the first output end is connected with a first battery cell through a first path so as to provide charging current for the first battery cell through the first path; a second charge pump having a second output connected to a second cell through a second path to provide a charging current to the second cell through the second path, wherein a path impedance of the second path is greater than a path impedance of the first path; the control circuit is configured to control a voltage of the first output terminal in a process of charging the first battery cell by using the first charge pump, so that charging currents of the first charging path and the second charging path are matched.

Optionally, an inductor is disposed on the first charging channel, the inductor and the first charge pump together form a buck circuit, and the control circuit adjusts the voltage of the first output end by controlling the buck circuit.

Optionally, the first charge pump and the second charge pump together form a two-phase charge pump; alternatively, the first charge pump and/or the second charge pump comprises a multiphase charge pump.

Optionally, the first charge pump includes a first switching tube, a second switching tube, a third switching tube and a fourth switching tube, the first switching tube and the second switching tube are connected in series between the charging input end and the first output end of the charging circuit, and the third switching tube and the fourth switching tube are connected in series between the first output end and the ground; the second charge pump comprises a fifth switching tube, a sixth switching tube, a seventh switching tube and an eighth switching tube, the fifth switching tube and the sixth switching tube are connected in series between the charging input end of the charging circuit and the second output end, and the seventh switching tube and the eighth switching tube are connected in series between the first output end and the ground.

Optionally, when the voltage of the first cell is greater than the voltage of the second cell, the control circuit controls the first switch tube and/or the second switch tube to be in a linear conduction state, so that the voltages of the first cell and the second cell are balanced; or when the voltage of the first battery cell is smaller than the voltage of the second battery cell, the control circuit controls the fifth switching tube and/or the sixth switching tube to be in a linear conduction state, so that the voltages of the first battery cell and the second battery cell are balanced.

Optionally, the charging circuit comprises a plurality of the first charge pump and the second charge pump connected in parallel.

In a second aspect, there is provided a charging method, the method comprising: charging the first battery cell and the second battery cell by using a charging circuit; wherein the charging circuit comprises: a first charge pump having a first output connected to the first cell through a first path to provide a charging current to the first cell through the first path; a second charge pump having a second output connected to a second cell through a second path to provide a charging current to the second cell through the second path, wherein a path impedance of the second path is greater than a path impedance of the first path; the method further comprises the following steps: and in the process of charging the first battery cell by using the first charge pump, controlling the voltage of the first output end to enable the charging currents of the first charging path and the second charging path to be matched.

Optionally, an inductor is disposed on the first charging channel, and the inductor and the first charge pump together form a buck circuit; the method further comprises the following steps: and controlling the buck circuit to adjust the voltage of the first output end.

Optionally, the method further comprises: when the voltage of the first battery cell is greater than the voltage of the second battery cell, controlling the first switch tube and/or the second switch tube to be in a linear conduction state, so that the voltages of the first battery cell and the second battery cell are balanced; or when the voltage of the first battery cell is smaller than the voltage of the second battery cell, controlling the fifth switching tube and/or the sixth switching tube to be in a linear conduction state, so that the voltages of the first battery cell and the second battery cell are balanced.

In a third aspect, an electronic device is provided, including: a first cell and a second cell connected in parallel; the charging circuit according to the first aspect or any one of the optional embodiments of the first aspect.

In a fourth aspect, a computer-readable storage medium is provided, on which a computer program is stored, the computer program, when being executed by a processor, implementing the steps of the charging method according to any one of the optional implementation manners of the second aspect and the second aspect.

The charging circuit provided by the embodiment of the application utilizes the first charge pump and the second charge pump to respectively supply power for the two electric cores which are connected in parallel, adjusts the output voltage of the passage with smaller impedance through the control circuit, enables the two electric cores which are connected in parallel to achieve a charging balance state, and can effectively avoid the problems that in the prior art, the hardware cost is increased due to the load switch which is increased for load balance and the heat loss is increased under a large-current mode.

Drawings

Fig. 1 is a schematic diagram of a mobile phone in the related art.

Fig. 2 is a schematic diagram of another related art handset.

Fig. 3 is a circuit diagram of a charge pump in the related art.

Fig. 4 is a circuit diagram of a charge pump based charging system in the related art.

Fig. 5 is a schematic diagram of a charging system for charging parallel dual cells in the related art.

Fig. 6 is a result of simulation of the charging system in fig. 5.

Fig. 7 is a schematic diagram of a charging system for charging two parallel cells based on a path impedance compensation technique in the related art.

Fig. 8 is a result of simulation of the charging system in fig. 7.

Fig. 9 is a circuit diagram of a charging circuit according to an embodiment of the present application.

Fig. 10 is a circuit diagram of a buck circuit according to an embodiment of the present application.

Fig. 11 is a schematic flowchart of a charging method according to an embodiment of the present application.

Fig. 12 is a schematic structural diagram of an electronic device according to an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments.

Before describing the embodiments of the present application, a charging circuit, a charging method and problems thereof in the related art will be described in detail with reference to the accompanying drawings.

With the continuous development and progress of the technology, batteries with a dual-cell structure are provided in some consumer electronics products to increase the overall capacity of the batteries. For example, in the folding screen mobile phone 10 shown in fig. 1, the first battery cell 111 and the second battery cell 112 in the battery are symmetrically arranged on both sides of the bending axis 12. For example, in the cellular phone 20 shown in fig. 2, a part of the space inside the cellular phone 20 is occupied by a device such as a main board. Therefore, in order to maximize the capacity of the battery 21, a method widely adopted in the related art is to configure the battery 21 as a special-shaped battery, where the special-shaped battery 21 shown in fig. 2 includes a first battery cell 211 and a second battery cell 212, the first battery cell 211 is disposed on the left side of the main board, and the second battery cell 212 is disposed on the lower side of the main board.

In the related art, in order to improve charging efficiency, the above-described dual cell battery may be charged using a charge pump-based charging circuit. The charge pump is an efficient non-inductive DC-DC converter, and voltage conversion is carried out by using a capacitor as an energy storage element, so that voltage can be halved and current can be doubled; and (b) and (c). Because the impedance of the capacitor is small, the charging efficiency can be obviously improved, and the efficiency can reach more than 97% under the condition of large power. The operation of the charge pump is first illustrated in detail with reference to fig. 3, where fig. 3 shows a circuit diagram of a typical buck-type charge pump 30. The charge pump 30 in fig. 3 includes: an input terminal 31, an output terminal 32, a first capacitor 33, a second capacitor 34, a first switch 35, a second switch 36, a third switch 37 and a fourth switch 38.

The first switch 35, the second switch 36, the third switch 37 and the fourth switch 38 are sequentially connected in series between the input terminal 31 and the ground terminal, the first end of the first capacitor 33 is connected with the series node of the first switch 35 and the second switch 36, and the second end is connected with the series node of the third switch 37 and the fourth switch 38; a first terminal of the second capacitor 34 is connected to the series node of the second switch 36 and the third switch 37 and serves as the output terminal 32 of the charge pump, and a second terminal of the second capacitor 34 is connected to the ground terminal.

The working principle of the charge pump 30 in fig. 3 is: in the first segment, the first switch 35 and the third switch 37 are controlled to be closed, the second switch 36 and the fourth switch 38 are controlled to be opened, at this time, the first capacitor 33 and the second capacitor 34 are charged in series, and the voltage of the first capacitor 33 and the voltage of the second capacitor 34 are both half of the input voltage Vin; in a second period, the first switch 35 and the third switch 37 are controlled to be opened, the second switch 36 and the fourth switch 38 are controlled to be closed, the connection between the charge pump and the power supply device is disconnected, the first capacitor 33 and the second capacitor 34 are connected in parallel, the voltage is output through the output end 32, the output voltage Vout is equal to Vin/2, and meanwhile, when the two capacitors connected in parallel are simultaneously discharged, the current on the output path is doubled; by controlling the states of the plurality of switching transistors, the charge pump 30 is operated alternately in the first period and the second period, so that the charge pump can maintain the output of Vout equal to Vin/2.

Fig. 4 shows a charging system 40 based on the above-described charge pump in the related art, and the charging system 40 may be applied to the electronic device shown in fig. 1 and 2 to charge a battery in the electronic device.

The charging system 40 in fig. 4 includes a power supply device 41, a two-phase charge pump 42, a first battery cell 43, and a second battery cell 44. The two-phase charge pump 42 includes a first phase charge pump 421 and a second phase charge pump 422, wherein input ends of the first phase charge pump 421 and the second phase charge pump 422 are coupled and connected to the power supply device 43 through a charging interface of the electronic device; the outputs of the first phase charge pump 421 and the second phase charge pump 422 are coupled and connected to the first cell 43 and the second cell 44, which are connected in parallel, to charge the first cell 43 and the second cell 44. Wherein the power supply device 43 may be, for example, a power adapter or other power supply source.

With continued reference to FIG. 4, the first phase charge pump 421 includes switching transistors M1-M4, and the second phase charge pump 422 includes switching transistors M5-M8. When the two-phase charge pump 42 works, the working phases of the switching tubes M1 and M3 are controlled to be opposite to the phases of the switching tubes M5 and M7, and the working phases of the switching tubes M2 and M4 are controlled to be opposite to the phases of the switching tubes M6 and M8, so that the ripple of the output current can be effectively reduced. It should be noted that the two-phase charge pump 42 in fig. 4 is only an example, and in the related art, the two-phase charge pump 42 may be replaced by a single-phase charge pump or a multi-phase charge pump.

Referring back to fig. 1 and fig. 2, in the related art, when charging the battery 11 or the special-shaped battery 22, it is usually implemented by using an Integrated Circuit (IC) disposed on a motherboard, where the IC may be, for example, the aforementioned two-phase charge pump. Therefore, for a battery with two parallel cells, due to the limitation of the cell arrangement mode, one of the cells needs to be connected with the charging IC through the FPC. For example, in the folding screen mobile phone 10 shown in fig. 1, the charging IC13 is disposed on a side close to the first battery cell 111, and at this time, the second battery cell needs to be connected to the charging IC13 through the FPC 113. For another example, in the mobile phone 20 shown in fig. 2, the connection between the second cell 212 and the charging IC22 may be implemented by the FPC 213. An impedance is formed on the via due to the metal traces in the FPC. And, the impedance of the FPC is proportional to its length, that is, the further the distance between the charging IC and the second electric core, the more significant the impedance of the FPC. Thus, the impedance of the paths between the first battery cell and the second battery cell and the charging IC is inconsistent, and when the first battery cell and the second battery cell are charged, a voltage difference is generated between the first battery cell and the second battery cell; and, at the later stage of charging process, the pressure differential can be bigger and bigger, leads to when first electric core is full of, and second electric core is still not full of, and the electric core voltage of first electric core reaches full charge voltage promptly, and the voltage of second electric core is less than full charge voltage, causes the waste of battery capacity. In addition, in this case, after the charging is stopped, the first battery cell and the second battery cell are automatically balanced due to the voltage difference, so that the battery cell voltage approaches to a middle value, and the endurance time is shortened; particularly, in a large-current quick charging mode, the voltage difference is more obvious, and the waste of the battery capacity is also more obvious.

Referring to fig. 5, fig. 5 is a schematic diagram of a charging system for charging a first cell and a second cell in the related art, in which the charging IC51 is a two-phase charge pump as described above, and an input terminal of the charging IC51 is connected to a power supply to receive an input voltage Vin; the charging IC51 converts the input voltage into an output voltage Vout, and charges the first cell and the second cell through the output end; fig. 5 also shows a resistor R1 in the path between the second cell and the output of the charging IC51, which represents the impedance of the FPC mentioned above.

The circuit shown in fig. 5 was simulated, resulting in the simulation results shown in fig. 6. Because the impedance of a path between the first battery cell and the charging IC is small, only 50m omega internal resistance of the battery exists on the path, and therefore the charging current of the first battery cell reaches 3.1A; on the other hand, on the path between the second battery cell and the charging IC, since the FPC connecting the second battery cell and the charging IC has a path impedance of about 70m Ω, the impedance on the path is the sum of the impedance of the FPC and the internal resistance of the second battery cell, and is about 120m Ω, and the charging current of the second battery cell is only 1.3A. That is, due to the existence of the path impedance between the second battery cell and the charging IC, the charging current of the first battery cell is significantly larger than that of the second battery cell, so that the charging speed between the two battery cells has a larger difference.

In the related art, the above problem can be solved by a path compensation technique, and the principle is mainly to artificially introduce an impedance compensation device at a side where the path impedance is small, the impedance compensation device may be, for example, a load switch, the load switch may be implemented by MOS transistors forming a back-to-back manner, and the adjustment of the path impedance may be implemented by controlling a driving voltage and/or an on-off time of the MOS transistors. Fig. 7 shows a schematic circuit diagram of the impedance control compensation technique, wherein R2 is the equivalent impedance of the impedance compensation device. The circuit shown in fig. 7 is used for simulation, and a simulation result shown in fig. 8 is obtained, where fig. 8 shows a variation of input currents of the first battery cell and the second battery cell, waveforms of charging currents of the first battery cell and the second battery cell are overlapped, and the charging currents are both 1.42A. From the simulation results, it can be seen that the two cell charging currents can be equalized by using the path compensation technology.

Although the above-mentioned path compensation technique can solve the problem of the same charging efficiency caused by the non-uniform path impedance in the prior art, the technical solution still has some problems. First, adding a load switch to the path with lower impedance increases the cost of the electronic device. Secondly, because extra impedance needs to be artificially added in a low impedance path to realize equalization, under the condition that the charging current is large, for the impedance of 70m omega, when the input current is 3A, the heat loss is 630 mW; if the charging power is further increased to increase the charging current to 6A, the heat loss of the impedance will reach 2520 mW.

In order to solve the above problem, embodiments of the present application provide a charging circuit, which is described in detail below with reference to the accompanying drawings.

Fig. 9 shows a circuit diagram of a charging circuit provided in an embodiment of the present application, where the charging circuit 90 in fig. 9 includes:

the first charge pump 91 has a first output 911, and the first output 911 is connected to the first cell 93 through a first path 912 to provide a charging current for the first cell 93 through the first path 912.

And a second charge pump 92 having a second output end 921, wherein the second output end 921 is connected to a second cell 94 through a second path 922 to provide a charging current for the second cell 94 through the second path 922, and a path impedance of the second path 922 is greater than a path impedance of the first path 912.

The control circuit 95 is configured to control a voltage of the first output terminal 911 during a process of charging the first battery cell 93 by using the first charge pump 91, so that charging currents of the first path 912 and the second path 922 match.

It should be noted that the embodiment of the present application does not limit the specific types of the first charge pump 91 and the second charge pump 92, and may be, for example, a step-down charge pump as shown in fig. 3. Alternatively, in some embodiments, the first charge pump 91 and the second charge pump 92 may also be boost-type charge pumps.

In this embodiment, the first charge pump 91 and the second charge pump 92 may be a first phase charge pump and a second phase charge pump of the aforementioned two-phase charge pumps, and two phases of the two-phase charge pump are split to independently supply power to the first battery cell 93 and the second battery cell 94 which are connected in parallel.

It can be understood that, when the output voltages of the first output terminal 911 and the second output terminal 921 are the same, since the impedance of the second path 922 is greater than that of the first path 912, the charging current of the first path 912 is greater than that of the second path 922, so that the charging efficiency of the first battery cell 93 is significantly higher than that of the second battery cell 94. In this case, to balance the charging efficiencies of the first battery cell 93 and the second battery cell 94, the charging efficiency of the first battery cell 93 and the charging efficiency of the second battery cell 94 may be substantially balanced by reducing the voltage at the first output terminal 911 and further reducing the charging current of the first path 912.

In the embodiment of the present application, the control circuit 95 may be connected to the first charge pump 91 to control the voltage of the first output terminal 911 of the first charge pump 91. Specifically, the first charge pump 91 includes a plurality of switching tubes therein, and the plurality of switching tubes are configured to be connected to the control circuit 95. In the process of supplying power to the first electrical core 93, the control circuit 95 may be used to control on/off of each switching tube, so as to adjust the voltage of the first output terminal 911.

The charging circuit provided by the embodiment of the application utilizes the first charge pump and the second charge pump to independently supply power for the two electric cores which are connected in parallel, and adjusts the output voltage of the path with smaller impedance through the control circuit, so that the two electric cores which are connected in parallel can reach a charging balance state, and the problems that in the prior art, the hardware cost is increased due to the load switch which is increased for load balance and the heat loss is increased under a large-current mode can be effectively solved.

In some embodiments, in order to facilitate the adjustment of the voltage at the first output terminal 911, the inductor 96 and the first charge pump 91 may form a buck circuit by disposing the inductor 96 on the first path 912. The buck circuit is controlled by the control circuit 95 to adjust the voltage of the first output terminal 911.

Fig. 10 shows a circuit schematic diagram of the buck circuit, which is also called a three-level buck circuit. The difference between the three-level buck circuit of fig. 10 and the buck charge pump 30 of fig. 3 is the addition of an inductor 1001 between the output terminal 32 and the second capacitor 34. In the three-level buck circuit, the output voltage of the circuit can be adjusted by controlling the duty ratio of each switching tube.

Compared with the mode of adding a load switch in the prior art, the scheme of forming the three-level buck circuit by adding the inductor provided by the embodiment of the application can obviously improve the efficiency and reduce the heat loss. Taking an extreme scenario that the input voltage Vin is 9V as an example, when the charging current of the first battery cell is 3A, the heat loss is increased by 0.405W, and when the charging current is 6A, the heat loss is increased by 0.81W, compared with a scheme of adding a complex switch, the heat loss is reduced by about 1.71W at most, and the charging efficiency and the performance are obviously improved.

In the embodiment, the buck circuit is formed by adding the inductor at the output end of the charge pump, and the control circuit is utilized to accurately adjust the output voltage, so that the controlled balance of the charging currents on the two charging paths is realized. From the perspective of hardware, the existing charging IC based on the two-phase charge pump can be directly utilized, the effect can be realized only by adding an inductor at the output end of one phase, and when the charging IC is applied to electronic equipment, a special material does not need to be customized independently, so that the hardware cost can be effectively reduced.

In some embodiments, the first and second charge pumps in the foregoing may collectively form a dual-phase charge pump, for example, in fig. 9, the first and second charge pumps 91 and 91 collectively form a dual-phase charge pump 97. In other words, the first charge pump 91 and the second charge pump 92 may be a first phase charge pump and a second phase charge pump split by the two-phase charge pump 97.

In some embodiments, the first charge pump 91 and/or the second charge pump 92 may each be a charge pump including multiple phases, which is not particularly limited in the examples of the present application. The first charge pump 91 and/or the second charge pump 92 are provided as multiphase charge pumps, which can boost the charging current and/or voltage to improve the charging efficiency.

In some embodiments, referring back to fig. 9, the first charge pump 91 further includes a first switch Q1, a second switch Q2, a third switch Q3 and a fourth switch Q4, wherein the first switch Q1 and the second switch Q2 are connected in series between the charging input terminal of the charging circuit 90 and the first output terminal 911, and the third switch Q3 and the fourth switch Q4 are connected in series between the first output terminal 911 and ground.

The second charge pump 92 further includes a fifth switching tube Q5, a sixth switching tube Q6, a seventh switching tube Q7, and an eighth switching tube Q8. The fifth switching tube Q5 and the sixth switching tube Q6 are connected in series between the charging input end of the charging circuit and the second output end 921, and the seventh switching tube Q7 and the eighth switching tube Q8 are connected in series between the second output end 921 and the ground.

In the production and assembly process of the electronic equipment, a scene that one battery is buckled firstly and then another battery with larger pressure difference is buckled is realized. For example, if a first battery cell with a voltage of 4V is buckled first and then a second battery cell with a voltage of 3.4V is buckled, the two battery cells are buckled with each other due to a large voltage difference between the first battery cell and the second battery cell. In other words, the first cell and the second cell may automatically equalize due to the voltage difference. Specifically, the first battery cell charges the second battery cell until the voltages of the two battery cells are the same.

In the automatic equalization process, if no protection is provided in the charging circuit, the first cell and the second cell generate a large current in the balancing process, and when the current flows through the charging IC, the charging IC is irreversibly damaged.

In view of the above problem, in the embodiment of the present application, overcurrent protection during cell matching equalization may be implemented by using a plurality of switching tubes in the first charge pump 91 and the second charge pump 92. When the voltage of the first battery cell 93 is greater than the voltage of the second battery cell 94, the control circuit 95 may control the first switch Q1 and/or the second switch Q2 in the first charge pump 91 to be in a linear conducting state, so that the voltages of the first battery cell 93 and the second battery cell 94 are slowly balanced.

When the voltage of the first battery cell 93 is smaller than the voltage of the second battery cell 94, the control circuit 95 may control the fifth switch Q5 and/or the sixth switch Q6 in the second charge pump 92 to be in a linear conducting state, so that the voltages of the first battery cell 93 and the second battery cell 94 are slowly balanced.

In some embodiments, the first cell 93 and the second cell 94 in the embodiments of the present application may be formed by a plurality of cells connected in series. Alternatively, the above-mentioned plurality of cells connected in series with each other may be formed by connecting a plurality of sub-cells in series or in parallel.

In some embodiments, the charging circuit provided in the embodiment of the present application may also be used to charge a single-cell battery, and in this scenario, it is only necessary to directly connect the first output terminal 911 of the first charge pump 91 and the second output terminal 921 of the second charge pump 92, and configure both the first charge pump 91 and the second charge pump 92 to work in a charge pump mode, where the usage and control manner of the charge pump is completely consistent with that of a common step-down charge pump.

The apparatus embodiments of the present application are described in detail above in conjunction with fig. 9 and 10, and the method embodiments of the present application are described below in conjunction with fig. 11. It is to be understood that the description of the method embodiments corresponds to the description of the apparatus embodiments, and therefore reference may be made to the preceding apparatus embodiments for parts which are not described in detail.

Fig. 11 is a schematic flowchart of a charging method provided in an embodiment of the present application. The method of fig. 11 may be implemented, for example, using the charging circuit shown in fig. 9.

Referring to fig. 11, in step S1102, the first cell and the second cell are charged using a charging circuit.

Wherein the charging circuit comprises: a first charge pump having a first output connected to the first cell through a first path to provide a charging current to the first cell through the first path; and the second charge pump is provided with a second output end, the second output end is connected with a second battery cell through a second path so as to provide charging current for the second battery cell through the second path, and the path impedance of the second path is greater than that of the first path.

In step S1104, in the process of charging the first battery cell by using the first charge pump, the voltage of the first output terminal is controlled so that the charging currents of the first charging path and the second charging path match.

Optionally, the charging circuit in the embodiment of the present application may include a plurality of first charge pumps and second charge pumps connected in parallel.

As shown in fig. 12, an embodiment of the present application further provides an electronic device 1200. The electronic apparatus 1200 may include a first cell 1201, a second cell 1202, and a charging circuit 1203 connected in parallel with each other. The charging circuit 1203 may be the charging circuit 90 provided in any of the foregoing embodiments.

Embodiments of the present application further provide a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the steps of the charging method according to any of the foregoing embodiments.

In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.

In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When loaded and executed on a computer, cause the processes or functions described in accordance with the embodiments of the application to occur, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored on a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, from one website, computer, server, or data center to another website, computer, server, or data center via wire (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer readable storage medium may be any available medium that can be read by a computer or a data storage device including one or more available media integrated servers, data centers, and the like. The usable medium may be a magnetic medium (e.g., a floppy disk, a hard disk, a magnetic tape), an optical medium (e.g., a Digital Versatile Disk (DVD)), or a semiconductor medium (e.g., a Solid State Disk (SSD)), among others.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A charging circuit, comprising:

the first charge pump is provided with a first output end, and the first output end is connected with a first battery cell through a first path so as to provide charging current for the first battery cell through the first path;

a second charge pump having a second output connected to a second cell through a second path to provide a charging current to the second cell through the second path, wherein a path impedance of the second path is greater than a path impedance of the first path;

and the control circuit is used for controlling the voltage of the first output end in the process of charging the first battery cell by using the first charge pump so as to enable the charging currents of the first path and the second path to be matched.

2. The charging circuit according to claim 1, wherein an inductor is disposed on the first charging channel, the inductor and the first charge pump together form a buck circuit, and the control circuit adjusts the voltage of the first output terminal by controlling the buck circuit.

3. The charging circuit of claim 1,

the first charge pump and the second charge pump together form a two-phase charge pump; alternatively, the first and second electrodes may be,

the first charge pump and/or the second charge pump comprise a multi-phase charge pump.

4. The charging circuit of claim 1,

the first charge pump comprises a first switch tube, a second switch tube, a third switch tube and a fourth switch tube, the first switch tube and the second switch tube are connected between a charging input end and a first output end of the charging circuit in series, and the third switch tube and the fourth switch tube are connected between the first output end and the ground in series;

the second charge pump comprises a fifth switching tube, a sixth switching tube, a seventh switching tube and an eighth switching tube, the fifth switching tube and the sixth switching tube are connected between the charging input end of the charging circuit and the second output end in series, and the seventh switching tube and the eighth switching tube are connected between the second output end and the ground in series.

5. The charging circuit of claim 4,

when the voltage of the first battery cell is greater than the voltage of the second battery cell, the control circuit controls the first switching tube and/or the second switching tube to be in a linear conduction state, so that the voltages of the first battery cell and the second battery cell are balanced; alternatively, the first and second electrodes may be,

when the voltage of the first battery cell is smaller than the voltage of the second battery cell, the control circuit controls the fifth switching tube and/or the sixth switching tube to be in a linear conduction state, so that the voltages of the first battery cell and the second battery cell are balanced.

6. The charging circuit of claim 1, wherein the charging circuit comprises a plurality of the first charge pump and the second charge pump connected in parallel.

7. A method of charging, the method comprising:

charging the first battery cell and the second battery cell by using a charging circuit;

wherein the charging circuit comprises:

a first charge pump having a first output connected to the first cell through a first path to provide a charging current to the first cell through the first path;

the method further comprises the following steps: and in the process of charging the first battery cell by using the first charge pump, controlling the voltage of the first output end to enable the charging currents of the first charging path and the second charging path to be matched.

8. The charging method according to claim 7,

an inductor is arranged on the first charging channel, and the inductor and the first charge pump jointly form a buck circuit;

the method further comprises the following steps: and controlling the buck circuit to adjust the voltage of the first output end.

9. The charging method according to claim 7,

10. The charging method according to claim 7,

11. The charging method according to claim 10, further comprising:

when the voltage of the first battery cell is greater than the voltage of the second battery cell, controlling the first switch tube and/or the second switch tube to be in a linear conduction state, so that the voltages of the first battery cell and the second battery cell are balanced; alternatively, the first and second electrodes may be,

when the voltage of the first battery cell is smaller than the voltage of the second battery cell, controlling the fifth switching tube and/or the sixth switching tube to be in a linear conduction state, so that the voltages of the first battery cell and the second battery cell are balanced.

12. The charging method of claim 7, wherein the charging circuit comprises a plurality of the first charge pump and the second charge pump connected in parallel.

13. An electronic device, characterized in that the electronic device comprises:

a first cell and a second cell connected in parallel;

a charging circuit as claimed in any one of claims 1 to 6.

14. A computer-readable storage medium having stored thereon a computer program, characterized in that,

the computer program, when executed by a processor, implements the steps of the charging method of any one of claims 7 to 12.