Control circuit, charging control method and electronic equipment

Abstract

The embodiment of the invention provides a control circuit, a charging control method and electronic equipment, which are used for adjusting charging current and improving charging efficiency. A control circuit comprises a power management chip, a first battery, a second battery and a regulation and control circuit. The power management chip is electrically connected with the charger; the battery capacity of the first battery is greater than that of the second battery; the negative electrode of the first battery and the negative electrode of the second battery are both grounded; the positive electrode of the first battery is electrically connected with the power management chip; the regulation and control circuit is electrically connected with the power management chip and the positive electrode of the second battery; and the regulation and control circuit is configured to regulate the current value of the current charged into the second battery by the power management chip. The control circuit is used for charging the battery.

Description

Technical Field

[0001] The present disclosure relates to the field of charging technologies, and in particular, to a control circuit, a charging control method, and an electronic device. Background Art

[0002] Electronic devices such as mobile phones have become life tools for communication interaction, digital entertainment, etc. Large-capacity batteries and multiple batteries have become typical configurations emphasized by electronic devices. With the increase in the number of batteries, how to coordinate the charging currents of each battery in the electronic device, improve the charging efficiency, and reduce the charging cost has become an urgent problem to be solved. Summary of the Invention

[0003] The purpose of the embodiments of the present disclosure is to provide a control circuit, a charging control method, and an electronic device for adjusting the charging current of a battery, improving the charging efficiency, and reducing the charging cost.

[0004] On the one hand, a control circuit is provided. The control circuit includes: a power management chip, a first battery, a second battery, and a regulation circuit. The power management chip is electrically connected to a charger; the battery capacity of the first battery is greater than that of the second battery; the negative electrodes of the first battery and the second battery are both grounded; the positive electrode of the first battery is electrically connected to the power management chip; the regulation circuit is respectively electrically connected to the power management chip and the positive electrode of the second battery; the regulation circuit is configured to adjust the current value of the current charged from the power management chip into the second battery.

[0005] The control circuit provided by the embodiments of the present disclosure is configured such that the control circuit includes: a power management chip, multiple batteries, and a regulation circuit. The power management chip is electrically connected to a charger. The multiple batteries include a first battery and a second battery. The battery capacity of the first battery is greater than that of the second battery. The negative electrodes of the first battery and the second battery are both grounded. The positive electrode of the first battery is electrically connected to the power management chip. The regulation circuit is respectively electrically connected to the power management chip and the positive electrode of the second battery. And the regulation circuit is configured to adjust the current value of the current charged from the power management chip into the second battery. Thus, the charging current of the second battery can be accurately regulated by the regulation circuit. During the process when the second battery ends the constant-current charging stage and enters the constant-voltage charging stage, or when the second battery is in the constant-voltage charging stage while the first battery is in the constant-current charging stage, the regulation circuit can accurately adjust the current value of the current charged from the power management chip into the second battery to a smaller current value or directly adjust the current value to 0, thereby alleviating or avoiding damage to the second battery caused by a large charging current. Moreover, the current charged from the power management chip into the first battery will be larger. Thus, the charging efficiency of the first battery and the electronic device can be improved, the charging time can be shortened, and the charging cost can be reduced.

[0006] In addition, the regulation circuit provided by the embodiments of the present disclosure has a simple structure, occupies a small space in the electronic device, improves the layout flexibility of the regulation circuit in the electronic device, can be flexibly matched with batteries of different capacities, is not affected by the charging path of the battery or the wiring impedance on the charging loop, has fewer limitations in use, and is convenient and easy to use. Moreover, the cost of the regulation circuit is relatively low, which is beneficial to reducing the cost of the electronic device.

[0007] On the other hand, an electronic device is provided, and the electronic device includes the control circuit as described in any one of the above embodiments.

[0008] The above electronic device has the same beneficial technical effects as the control circuit provided in some of the above embodiments, and will not be elaborated herein.

[0009] On yet another hand, a charging control method is provided, which is applied to an electronic device. The electronic device includes: a power management chip, a first battery, a second battery, and a regulation circuit. The battery capacity of the first battery is greater than that of the second battery. The charging control method includes: detecting that the power management chip charges the first battery and the second battery. In response to detecting that the power management chip charges the first battery and the second battery, adjusting the current value of the current that the power management chip charges into the second battery through the regulation circuit.

[0010] The above charging control method has the same beneficial technical effects as the control circuit provided in some of the above embodiments, and will not be elaborated herein.

[0011] On yet another hand, a computer-readable storage medium is provided. The computer-readable storage medium includes computer instructions, and when the computer instructions run on a computer, the computer is caused to execute the charging control method as described in any one of the above embodiments.

[0012] The above computer-readable storage medium has the same beneficial technical effects as the control circuit provided in some of the above embodiments, and will not be elaborated herein. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the present disclosure, the drawings required for use in some embodiments of the present disclosure will be briefly introduced below. Obviously, the drawings in the following description are only the drawings of some embodiments of the present disclosure, and those of ordinary skill in the art can also obtain other drawings according to these drawings. In addition, the drawings in the following description can be regarded as schematic diagrams, and are not limitations on the actual sizes of the products, the actual processes of the methods, etc. involved in the embodiments of the present disclosure.

[0014] Figure 1 FIG. is a structural diagram of an electronic device according to some embodiments of the present disclosure;

[0015] Figure 2 Structural diagram of a control circuit and a charger according to some embodiments of the present disclosure;

[0016] Figure 3 Structural diagram of a regulation circuit according to some embodiments of the present disclosure;

[0017] Figure 4 Structural diagram of a control circuit according to some embodiments of the present disclosure;

[0018] Figure 5 Structural diagram of another control circuit according to some embodiments of the present disclosure;

[0019] Figure 6 Output characteristic diagram of a P-type metal oxide semiconductor field effect transistor according to some embodiments of the present disclosure;

[0020] Figure 7 Structural diagram of yet another control circuit according to some embodiments of the present disclosure;

[0021] Figure 8 Structural diagram of another regulation circuit according to some embodiments of the present disclosure;

[0022] Figure 9 Structural diagram of yet another control circuit according to some embodiments of the present disclosure;

[0023] Figure 10 Structural diagram of yet another control circuit according to some embodiments of the present disclosure;

[0024] Figure 11 Structural diagram of yet another control circuit according to some embodiments of the present disclosure;

[0025] Figure 12 Structural diagram of yet another control circuit according to some embodiments of the present disclosure;

[0026] Figure 13 Structural diagram of yet another control circuit according to some embodiments of the present disclosure;

[0027] Figure 14 Structural diagram of yet another control circuit according to some embodiments of the present disclosure;

[0028] Figure 15 Structural diagram of yet another control circuit according to some embodiments of the present disclosure;

[0029] Figure 16 Structural diagram of yet another control circuit according to some embodiments of the present disclosure. Detailed implementation manners

[0030] The technical solutions in some embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings. Apparently, the described embodiments are only a part rather than all of the embodiments of the present disclosure. All other embodiments obtained by those of ordinary skill in the art based on the embodiments provided in the present disclosure fall within the scope of protection of the present disclosure.

[0031] Unless the context requires otherwise, throughout the specification and claims, the term "comprise" and its other forms, such as the third-person singular form "comprises" and the present participle form "comprising", are interpreted as open and inclusive, that is, "including, but not limited to". In the description of the specification, the terms "one embodiment", "some embodiments", "exemplary embodiments", "example", "specific example", or "some examples", etc., are intended to indicate that specific features, structures, materials, or characteristics related to this embodiment or example are included in at least one embodiment or example of the present disclosure. The schematic representations of the above terms do not necessarily refer to the same embodiment or example. In addition, the specific features, structures, materials, or characteristics may be included in any one or more embodiments or examples in any appropriate manner.

[0032] Hereinafter, the terms "first" and "second" are used for descriptive purposes only and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the embodiments of the present disclosure, unless otherwise stated, the meaning of "a plurality" is two or more.

[0033] In addition, the use of "based on" means open and inclusive because a process, step, calculation, or other action "based on" one or more of the stated conditions or values may in practice be based on additional conditions or values beyond those stated.

[0034] In describing some embodiments, the expressions "coupled" and "connected" and their derivatives may be used. The term "connected" should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or integrated; it can be directly connected or indirectly connected through an intermediate medium. The term "coupled" indicates, for example, that two or more components have direct physical contact or electrical contact. The term "coupled" or "communicatively coupled" may also refer to two or more components that do not have direct contact with each other but still cooperate or interact with each other. The embodiments disclosed herein are not necessarily limited to the content herein.

[0035] In the circuit structure provided by the embodiments of the present disclosure, the first electrode of each transistor is one of the source electrode and the drain electrode, and the second electrode of each transistor is the other of the source electrode and the drain electrode. Since the source electrode and the drain electrode of the transistor can be symmetric in structure, their source electrode and drain electrode can be indistinguishable in structure, that is to say, the first electrode and the second electrode of the transistor in the embodiments of the present invention can be indistinguishable in structure. Exemplarily, when the transistor is a P-type transistor, the first electrode of the transistor is the source electrode and the second electrode is the drain electrode; Exemplarily, when the transistor is an N-type transistor, the first electrode of the transistor is the drain electrode and the second electrode is the source electrode.

[0036] In the circuit structure provided by the embodiments of the present disclosure, nodes such as the first node and the second node do not represent actual existing components, but represent the convergence points of relevant couplings in the circuit diagram, that is to say, these nodes are nodes equivalent to the convergence points of relevant couplings in the circuit diagram.

[0037] In the present invention, the P-type transistor can be turned on under the control of a low-level signal, and the N-type transistor can be turned on under the control of a high-level signal.

[0038] Embodiments of the present disclosure provide an electronic device, such as a consumer electronic product, a home electronic product, a vehicle-mounted electronic product, or a financial terminal product. Among them, consumer electronic products can be mobile phones, tablets, desktop computers, laptop computers, handheld computers, notebook computers, personal computers (PCs), netbooks, as well as cellular phones, personal digital assistants (PDAs), augmented reality (AR) devices, virtual reality (VR) devices, artificial intelligence (AI) devices, intelligent wearable devices (e.g., smart watches, smart bracelets), etc. Embodiments of this application do not impose special restrictions on the specific types of the electronic device. Home electronic products can be televisions, remote controls, refrigerators, rechargeable household small appliances (e.g., soymilk makers, floor cleaning robots), etc. Vehicle-mounted electronic products can be rechargeable vehicle navigation devices, in-vehicle DVDs, etc. Financial terminal products can be rechargeable terminals for self-service business handling, etc.

[0039] Embodiments of the present disclosure do not impose special restrictions on the specific form of the above-mentioned electronic device. For the convenience of description below, the electronic device is taken as an example of a mobile phone.

[0040] In some embodiments provided by the present disclosure, as Figure 1 shown, the above-mentioned electronic device 100 mainly includes a display module 110, a middle frame 120, a housing 130, and a cover plate 140.

[0041] Among them, the above-mentioned display module 110 and the middle frame 120 are arranged inside the housing 130. The middle frame 120 is located between the display module 110 and the housing 130. The surface of the middle frame 120 away from the display module 110 (i.e., the surface facing the housing 130) is used to mount internal components such as a circuit board, a camera, and an antenna.

[0042] The above-mentioned cover plate 140 is located on the side of the display module 110 away from the middle frame 120. The cover plate 140 can be, for example, a cover glass (CG), and the cover glass can have a certain toughness.

[0043] The display module 110 has a light-emitting side capable of displaying a picture and a backlight side disposed opposite to the light-emitting side. The middle frame 120 is disposed on the backlight side of the display module 110, and the cover plate 140 is disposed on the light-emitting side of the display module 110.

[0044] In some examples, a battery 30 is disposed in the middle frame 120, and the battery 30 can supply power to the display module 110. After the battery 30 consumes power, it is necessary to use a charger to charge the battery 30 so that the electronic device 100 can be used normally.

[0045] The number of the above-mentioned batteries 30 can be one, two, three or even more. When the number of batteries is multiple, the multiple batteries can be connected in parallel. Moreover, the battery capacities of the multiple batteries can be equal or unequal, and can be specifically selected and set according to actual needs. In the embodiments of the present disclosure, the case where the battery capacities of at least two of the multiple batteries are different is taken as an example for illustration.

[0046] The electronic device 100 may further include a microcontroller unit (MCU), and the MCU is used to send instructions to the display module 110 and the like to control the display screen of the display module 110 and the like.

[0047] In the related art, during the process of charging multiple batteries using a charger, since the battery capacities of at least two of the multiple batteries are different, the full charge times of the two batteries are different. When the battery with a smaller capacity is fully charged or in the constant voltage charging stage, the battery with a larger capacity is not fully charged yet (for example, in the constant current charging stage), and a larger charging current is required to complete the charging process. At this time, the charger or the power management chip will provide a larger charging current to the battery with a larger capacity. However, during the process that the charger or the power management chip provides a larger charging current to the battery with a larger capacity, the larger charging current will also be charged into the battery with a smaller capacity, which is likely to damage the battery with a smaller capacity and reduce the charging safety; moreover, since the larger charging current will also be charged into the battery with a smaller capacity, it will also reduce the charging current charged into the battery with a larger capacity to a certain extent, thereby reducing the charging efficiency of the battery with a larger capacity, increasing the charging time, and increasing the charging cost.

[0048] In one implementation, a load switch chip is used to precisely control the trace impedance on the charging paths of multiple batteries to control the charging currents of different batteries, so as to balance the charging currents of different batteries. However, the package structure of the load switch chip is relatively large, there are many functional devices used in conjunction with it, it occupies a large space in the electronic device, it is difficult to flexibly layout the load switch chip and related functional devices, and the cost of the load switch chip is relatively high, resulting in a relatively high charging cost.

[0049] In addition, the load switch chip has very strict requirements for the capacity of the battery it controls and the impedance of the wiring. However, in actual production, it is very difficult to ensure that the battery capacities of multiple batteries and the impedance of the corresponding charging paths are exactly equal. Taking the difference in the impedance of the charging paths of two batteries as 0.1 Ω and the charging current of both being 6 A, the difference in power consumption between the two wiring impedances is as high as 3.6 W. Therefore, the load switch chip cannot accurately adjust the charging current of different batteries and cannot avoid large currents from charging into the battery with a smaller capacity.

[0050] Based on this, as Figure 2 shown, an embodiment of the present disclosure provides a control circuit 20, which is applied to the above-mentioned electronic device 100. The control circuit 20 includes: a power management chip 21, a plurality of batteries 30, and a regulation circuit 40.

[0051] The power management chip 21 is electrically connected to the charger 50. For example, the charger 50 can be a fast charger or a normal charger.

[0052] The power management chip 21 interacts with the charger 50 to obtain the type of the charger 50, etc.; the power management chip 21 can also interact with the plurality of batteries 30 to obtain or detect the power status, charging status, etc. of the plurality of batteries 30.

[0053] Taking the example that the plurality of batteries 30 include a first battery 31 and a second battery 32, and the battery capacity of the first battery 31 is greater than that of the second battery 32. For example, the battery capacity of the first battery 31 is 3000 mAh, and the battery capacity of the second battery 32 is 300 mAh.

[0054] The negative electrodes of the first battery 31 and the second battery 32 are both grounded. The positive electrode of the first battery 31 is electrically connected to the power management chip 21. The regulation circuit 40 is respectively electrically connected to the power management chip 21 and the positive electrode of the second battery 32.

[0055] The regulation circuit 40 is configured to adjust the current value of the current charged into the second battery 32 by the power management chip 21.

[0056] For example, when the charger 50 charges the first battery 31 and the second battery 32, during the process that the second battery 32 ends the constant current charging stage and enters the constant voltage charging stage, or when the second battery 32 is in the constant voltage charging stage while the first battery 31 is in the constant current charging stage, the control circuit 40 adjusts the current value of the current that the power management chip 21 charges into the second battery 32 to a smaller current value or directly adjusts the current value to 0, so as to relieve or avoid damage to the second battery 32 caused by a large charging current. Moreover, since the output current value of the power management chip 21 is constant, when the current value of the current charged into the second battery 32 is reduced, the current that the power management chip 21 charges into the first battery 31 will increase to a certain extent. Thus, the charging efficiency of the first battery 31 and the electronic device 100 can be improved, the charging time can be shortened, and the charging cost can be reduced.

[0057] For another example, when the charger 50 charges the first battery 31 and the second battery 32, during the process that the second battery 32 is in the trickle charging stage, the control circuit 40 adjusts the current value of the current that the power management chip 21 charges into the second battery 32 to a smaller current value, so as to avoid damage to the second battery 32.

[0058] The above control circuit 20 provided by the embodiments of the present disclosure is configured such that the control circuit 20 includes: a power management chip 21, a plurality of batteries 30, and a control circuit 40. The power management chip 21 is electrically connected to the charger 50. The plurality of batteries 30 include a first battery 31 and a second battery 32. The battery capacity of the first battery 31 is greater than that of the second battery 32. The negative electrodes of the first battery 31 and the second battery 32 are both grounded. The positive electrode of the first battery 31 is electrically connected to the power management chip 21. The control circuit 40 is respectively electrically connected to the power management chip 21 and the positive electrode of the second battery 32. And the control circuit 40 is configured to adjust the current value of the current that the power management chip 21 charges into the second battery 32. Thus, the charging current of the second battery 32 can be accurately regulated by the control circuit 40. During the process that the second battery 32 ends the constant current charging stage and enters the constant voltage charging stage, or when the second battery 32 is in the constant voltage charging stage while the first battery 31 is in the constant current charging stage, the control circuit 40 can accurately adjust the current value of the current that the power management chip 21 charges into the second battery 32 to a smaller current value or directly adjust the current value to 0, so as to relieve or avoid damage to the second battery 32 caused by a large charging current. Moreover, the current that the power management chip 21 charges into the first battery 31 will be larger. Thus, the charging efficiency of the first battery 31 and the electronic device 100 can be improved, the charging time can be shortened, and the charging cost can be reduced.

[0059] In addition, the control circuit 40 provided by the embodiments of the present disclosure has a simple structure, occupies a small space in the electronic device 100, improves the layout flexibility of the control circuit 40 in the electronic device 100. The control circuit 40 can be flexibly matched with batteries of different capacities, is not affected by the charging path of the battery or the wiring impedance on the charging loop, has fewer limitations in its use, and is convenient and easy to use. Moreover, the cost of the control circuit 40 is relatively low, which helps to reduce the cost of the electronic device 100.

[0060] In some examples, such as Figure 3 and Figure 4 as shown, the control circuit 40 includes: a first branch 41 and a second branch 42.

[0061] The first branch 41 includes: a first control terminal CT1, a first output terminal OP1, and a first input terminal IP1. The second branch 42 includes: a second output terminal OP2 and a first enable terminal EN1.

[0062] The first control terminal CT1 of the first branch 41 is electrically connected to the second output terminal OP2 of the second branch 42. The first input terminal IP1 of the first branch 41 is electrically connected to the power management chip 21. The first output terminal OP1 of the first branch 41 is electrically connected to the positive electrode of the second battery 32. The first enable terminal EN1 of the second branch 42 is coupled to the power management chip 21.

[0063] The second branch 42 is configured to receive a first enable signal from the power management chip 21 and provide a first voltage to the first branch 41 according to the first enable signal.

[0064] For example, the power management chip 21 can be configured to receive a first instruction from the MCU. In response to the first instruction, the power management chip 21 issues a first enable signal to the second branch 42.

[0065] The first branch 41 is configured to adjust the current value charged into the second battery 32 by the power management chip 21 according to the first voltage.

[0066] Thus, when the second branch 42 receives the first enable signal from the power management chip 21, different first voltages are provided to the first branch 41 according to different first enable signals. Here, the different first voltages can be voltages with unequal values. The first branch 41 adjusts the magnitude of the current value charged into the second battery 32 by the first power management chip 21 according to different first voltages. Therefore, different charging currents can be provided according to different charging stages of the second battery 32, thereby avoiding damage to the second battery 32, improving the service life of the electronic device 100, and indirectly adjusting the charging current charged into the first battery 31 by the power management chip 21, thereby improving the charging efficiency of the first battery 31 and the electronic device 100, shortening the charging time, and reducing the charging cost.

[0067] It can be understood that the second branch 42 can also be configured to receive a first enable signal from the power management chip 21, and according to the first enable signal, turn off the second branch 42 or disconnect the electrical connection between the first branch 41 and the second branch 42. Thus, the first branch 41 can be not controlled by the second branch 42.

[0068] In some examples, as Figure 5 shown, the first branch 41 includes: a first transistor M1, a first diode D1, a second transistor M2, a second diode D2, and a first resistor R1.

[0069] The first pole of the first transistor M1 is electrically connected to the first pole of the second transistor M2, the control pole of the first transistor M1 is electrically connected to the control pole of the second transistor M2, the second pole of the first transistor M1 can be multiplexed as the first input terminal IP1 of the first branch 41, and the second pole of the first transistor M1 is electrically connected to the power management chip 21.

[0070] The second pole of the second transistor M2 can be used as the first output terminal OP1 of the first branch 41, and the second pole of the second transistor M2 is electrically connected to the positive pole of the second battery 32.

[0071] The first end of the first resistor R1 is electrically connected to the first pole of the first transistor M1, and the second end of the first resistor R1 is electrically connected to the control pole of the first transistor M1.

[0072] The second end of the first resistor R1, and the control poles of the first transistor M1 and the second transistor M2 connected thereto, can be used as the first control terminal CT1 of the first branch 41.

[0073] The anode of the first diode D1 is electrically connected to the second pole of the first transistor M1, and the cathode of the first diode D1 is electrically connected to the first pole of the first transistor M1.

[0074] The anode of the second diode D2 is electrically connected to the second pole of the second transistor M2, and the cathode of the second diode D2 is electrically connected to the first pole of the second transistor M2.

[0075] The resistance value of the above-mentioned first resistor R1 can be 100 KΩ.

[0076] For example, when the electronic device 100 starts charging (for example, the electronic device 100 or the power management chip 21 is electrically connected to the charger 50), the second voltage provided by the power management chip 21 (for example, the second voltage is 5V) is greater than the voltage of the second battery 32 (for example, the voltage of the second battery 32 is 3.7V), and the first diode D1 conducts; the second branch 42 provides a first voltage for the first control terminal CT1, and the second voltage charges the control electrode of the second transistor M2 through the first diode D1 and the first resistor R1, so that the second transistor M2 meets the conduction condition and the second transistor M2 conducts. Thus, the conduction of the charging circuit from the power management chip 21 to the second battery 32 is realized. Moreover, according to the magnitude of the first voltage provided by the second branch 42, the conduction degree of the second transistor M2 is adjusted, and further the magnitude of the charging current from the power management chip 21 to the second battery 32 is adjusted.

[0077] In addition, when the voltage of the first battery 31 is relatively high and the voltage of the second battery 32 is relatively low, the power management chip 21 is connected to the regulation circuit 40 through the first node N1, and the power management chip 21 is connected to the first battery 31 through the first node N1. The first battery 31 can charge the second battery 32 through the path between the first node N1 and the second battery 32, thereby protecting the second battery 32, which is beneficial to improving the service life of the second battery 32 and the electronic device 100 and avoiding damage caused by the low power of the second battery 32 for a long time.

[0078] For another example, when the electronic device 100 is not charging (for example, the electronic device 100 or the power management chip 21 is not electrically connected to the charger 50), the second voltage provided by the power management chip 21 (for example, the second voltage is 0V) is less than the voltage of the second battery 32, and the second diode D2 conducts; the second branch 42 provides a low first voltage for the first control terminal CT1, and the voltage of the second battery 32 charges the control electrode of the first transistor M1 through the second diode D2 and the first resistor R1, so that the first transistor M1 meets the conduction condition and the first transistor M1 conducts. Thus, the conduction of the circuit between the second battery 32 and the power management chip 21 (or the first node N1) is realized. Moreover, according to the magnitude of the first voltage provided by the second branch 42, the conduction degree of the second transistor M2 is adjusted, and further the magnitude of the charging current between the second battery 32 and the power management chip 21 (or the first node N1 mentioned below) is adjusted. In addition, when the voltage of the first battery 31 is relatively low and the voltage of the second battery 32 is relatively high, the second battery 32 can also charge the first battery 31 through the path between the first node N1 and the first battery 31, thereby protecting the first battery 31, which is beneficial to improving the charging safety and service life of the first battery 31 and the electronic device 100 and avoiding damage caused by the low power of the first battery 31 for a long time.

[0079] In some examples, both the first transistor M1 and the second transistor M2 are P-channel Metal Oxide Semiconductor transistors.

[0080] Figure 6 It is the output characteristic curve of a P-channel Metal Oxide Semiconductor transistor. Figure 6 In it, the abscissa is the voltage difference Vds between the source and drain of the transistor, the ordinate is the on-current Id between the source and drain of the transistor, and each curve is the relationship curve of Vds~Id under different gate-source voltage differences Vgs of the transistor. In the direction of decreasing successively along the horizontal axis, the absolute value of the voltage difference Vgs corresponding to each curve increases successively.

[0081] The present disclosure can utilize the characteristics of the constant current region in the above output characteristic curve to adjust the magnitude of the voltage difference Vgs between the gate and the source of the first transistor M1 or the second transistor M2, so as to achieve the purpose of adjusting the magnitude of the on-current Id between the source and drain. For example, taking the first transistor M1 as an example, in combination with Figure 5 and Figure 6 , the larger the absolute value of the voltage difference Vgs between the control electrode and the source of the first transistor M1, the larger the on-current Id between the source and drain, and the larger the current value charged into the second battery 32 by the power management chip 21. Conversely, the smaller the absolute value of the above voltage difference Vgs, the smaller the on-current Id, and the smaller the current value charged into the second battery 32 by the power management chip 21.

[0082] Therefore, by controlling the magnitude of the absolute value of the voltage difference Vgs between the control electrode and the source of the first transistor M1, the magnitude of the on-current Id between the source and drain can be adjusted. The control electrodes of the first transistor M1 and the second transistor M2 are electrically connected to the second branch 42. Thus, by adjusting the magnitude of the first voltage transmitted by the second branch 42 to the control electrodes of the first transistor M1 and the second transistor M2, the adjustment of the on-current Id or the current charged into the second battery 32 by the power management chip 21 can be achieved.

[0083] Exemplarily, the first diode D1 is the body diode of the first transistor M1. The second diode D2 is the body diode of the second transistor M2. Thus, the structure of the control circuit 20 can be simplified.

[0084] In some examples, as Figure 7 shown, the second branch 42 includes: a low-dropout regulator (LDO). The low-dropout regulator (LDO) is electrically connected to the first control end of the first branch 41, and the low-dropout regulator (LDO) is coupled to the power management chip 21.

[0085] For example, the linear voltage regulator LDO can provide a first voltage with different voltage values for the first branch 41 according to the first enable signal provided by the power management chip 21, so as to adjust the size of the charging circuit for charging the second battery 32 by the power management chip 21.

[0086] In some examples, such as Figure 8 and Figure 9 as shown, the regulation circuit 40 further includes: a current limiting circuit 43. The current limiting circuit 43 includes a current limiting input terminal CL1 and a current limiting output terminal CL2. The current limiting output terminal CL2 is electrically connected to the first control terminal CT1 of the first branch 41, and the current limiting input terminal CL1 is electrically connected to the second output terminal OP2 of the second branch 42.

[0087] The current limiting circuit 43 is configured to cooperate with the first branch 41 to jointly adjust the current value charged into the second battery 32 by the power management chip 21.

[0088] For example, the current limiting circuit 43 can adjust the voltage signal provided by the second branch 42 and then transmit it to the first branch 41.

[0089] Thus, the current limiting circuit 43 can preprocess the voltage signal provided by the second branch 42, adjust it to a suitable voltage signal and then transmit it to the first branch 41, so as to realize the adjustment of the current value charged into the second battery 32 by the power management chip 21, and avoid damage to the first branch 41 caused by the excessive voltage signal.

[0090] In some examples, such as Figure 10 as shown, the current limiting circuit 43 includes: a second resistor R2.

[0091] The second resistor R2 is electrically connected to the first control terminal of the first branch 41 and the second output terminal of the second branch 42 respectively.

[0092] The second resistor R2 can play a voltage dividing role for the first voltage provided by the second branch 42.

[0093] In some examples, such as Figure 11 as shown, the control circuit 20 further includes: a protection circuit 60. The protection circuit 60 includes a second enable terminal EN2. The protection circuit 60 is coupled to the power management chip 21, and the protection circuit 60 is electrically connected to the regulation circuit 40. In this case, the positive electrode of the first battery 31 is electrically connected to the power management chip 21 through the first node N1. The regulation circuit 40 is electrically connected to the power management chip 21 through the first node N1.

[0094] The protection circuit 60 is configured to receive the second enable signal from the power management chip 21 and conduct or disconnect the path between the first node N1 and the positive electrode of the second battery 32 according to the second enable signal.

[0095] The second enable terminal EN2 of the protection circuit 60 is used to receive the second enable signal of the power management chip 21.

[0096] For example, when the batteries 30 are all in the constant voltage charging stage, or the first battery 31 is in the constant current charging stage and the second battery 32 is about to enter the constant voltage charging stage, the protection circuit 60 receives the second enable signal from the power management chip 21. According to the second enable signal, the path between the first node N1 and the positive electrode of the second battery 32 is disconnected, so that the charging path of the power management chip 21 to the second battery 32 is disconnected, avoiding damage to the second battery 32 due to a large current charged into it, and thus improving the service life of the second battery 32 and the electronic device 100.

[0097] For another example, when the electronic device is in the shutdown state or the shutdown and maintenance state, both the protection circuit 60 and the regulation circuit 40 are in the off state, and the path between the first node N1 and the second battery 32 is disconnected, so as to protect the second battery 32, avoiding the first battery 31 charging the second battery 32 through the path between the first node N1 and the second battery 32, thus avoiding damage to the second battery 32 and the phenomenon of mutual charging current between the first battery 31 and the second battery 32.

[0098] For another example, when the batteries 30 are all in the constant current charging stage, the protection circuit 60 receives the second enable signal from the power management chip 21. According to the second enable signal, the path between the first node N1 and the positive electrode of the second battery 32 is conducted, so that the charging current of the power management chip 21 to the second battery 32 is not restricted, improving the charging efficiency of the second battery 32.

[0099] It can be understood that the protection circuit 60 can also be configured to receive the second enable signal from the power management chip 21 and, according to the second enable signal, turn off the protection circuit 60 or disconnect the electrical connection between the protection circuit 60 and the regulation circuit 40. Thus, the regulation circuit 40 can be not controlled by the protection circuit 60.

[0100] In some examples, as Figure 12 shown, the protection circuit 60 includes: a triode Q1.

[0101] The base of the triode Q1 is coupled to the power management chip 21, the collector of the triode Q1 is electrically connected to the regulation circuit 40, and the emitter of the triode Q1 is grounded.

[0102] For example, the base of the triode Q1 is used to receive the second enable signal from the power management chip 21, and the collector of the triode Q1 is used to transmit a voltage signal to the regulation circuit 40.

[0103] For example, when the second branch 42 is closed and the protection circuit 60 is closed, or when the triode Q1 is cut off and the low-dropout regulator (LDO) is cut off, and the second voltage provided by the power management chip 21 is greater than the voltage of the second battery 32 (it can be considered that the second battery 32 ends the constant current charging stage or is in the constant voltage charging stage), the second diode D2 is in the cut-off state, and the first diode D1 is conducting. The control electrode (or gate) of the second transistor M2 is charged through the first resistor R1, so that the voltage of the control electrode is equal to the voltage of the source. The gate-source voltage difference Vgs of the second transistor M2 is 0, and the second transistor M2 cannot conduct, and the first transistor M1 also cannot conduct, thereby disconnecting the path between the first node N1 and the second battery 32. When the second voltage provided by the power management chip 21 is less than the voltage of the second battery (it can be considered that the power management chip is not connected to the charger), the first diode D1 is in the cut-off state, and the second diode D2 is conducting. The gate of the first transistor M1 is charged through the first resistor R1, so that the voltage of the control electrode is equal to the voltage of the source. The gate-source voltage difference Vgs of the first transistor M1 is 0, and the first transistor M1 cannot conduct, and the second transistor M2 also cannot conduct, thereby disconnecting the path between the first node N1 and the second battery 32.

[0104] Using the triode Q1 as the protection circuit 60, when the triode Q1 is turned on, the emitter of the triode Q1 can be grounded to provide a ground voltage for the regulation circuit 40, which is convenient for realizing the conduction of the path between the first node N1 and the second battery 32. The structure of the triode Q1 is simple and occupies less space, which is beneficial to improving the layout flexibility of the regulation circuit 40 in the electronic device 100. In addition, the power consumption of the triode Q1 during operation or use is low, which is beneficial to reducing the power consumption of the control circuit 20 and the electronic device 100.

[0105] In some examples, such as Figure 13 and Figure 14 as shown, when the regulation circuit 40 includes the first branch 41 and the second branch 42, the protection circuit 60 is electrically connected to the first control end of the first branch 41.

[0106] Thus, the protection circuit 60 can transmit voltage signals, etc., to the first branch 41 for conducting or disconnecting the path between the first node N1 and the positive electrode of the second battery 32.

[0107] In some examples, such as Figure 15 and Figure 16 as shown, when the regulation circuit 40 includes the first branch 41, the second branch 42 and the current limiting circuit 43, the protection circuit 60 is electrically connected to the current limiting input end of the current limiting circuit 43.

[0108] Accordingly, the protection circuit 60 transmits a voltage signal to the regulation circuit 40. After being divided by the current-limiting circuit 43, it is then transmitted to the first branch 41.

[0109] In the above embodiments of the present disclosure, the provided control circuit 20 is applied to the above electronic device 100 to protect the battery 30, improve the charging efficiency of the electronic device 100, and extend the service life of the electronic device 100.

[0110] Some embodiments of the present disclosure also provide a charging control method. This charging method is applied to the above electronic device 100, which includes: the above power management chip 21, the first battery 31, the second battery 32, and the regulation circuit 40. The battery capacity of the first battery 31 is greater than that of the second battery 32.

[0111] Specifically, the charging control method includes: S100 - S200.

[0112] S100, it is detected that the power management chip 21 is charging the first battery 31 and the second battery 32.

[0113] For example, the electronic device 100 (such as the MCU or the power management chip 21 inside the electronic device 100) can detect the states of the power management chip 21 and the battery 30.

[0114] S200, in response to detecting that the power management chip 21 is charging the first battery 31 and the second battery 32, the regulation circuit 40 is used to adjust the current value of the current that the power management chip 21 charges into the second battery 32.

[0115] It can be understood that since the battery capacity of the first battery 31 is greater than that of the second battery 32, in the same period, the charging stages of the first battery 31 and the second battery 32 may be different. Therefore, the charging current required by the second battery 32 may be different from that required by the first battery 31. The charging control method provided by the embodiments of the present disclosure can adjust the current value of the current that the power management chip 21 charges into the second battery 32 through the regulation circuit 40, thereby avoiding damage to the second battery 32 due to a large current charging into it, and further improving the service life of the second battery 32 and the electronic device 100. In addition, the above adjustment can also make the current value of the current that the power management chip 21 charges into the first battery 31 larger, thereby improving the charging efficiency of the first battery 31 and the electronic device 100, shortening the charging time, and reducing the charging cost.

[0116] Specifically, in the above S200, there are various implementation manners for adjusting the current value of the current that the power management chip 21 charges into the second battery 32 through the regulation circuit 40, which can be selected and set according to the actual situation.

[0117] In some examples, in the above S200, regulating the current value of the current that the power management chip 21 charges into the second battery 32 through the regulation circuit 40 includes:

[0118] In the trickle charging stage of the charging process, through the regulation circuit 40, the current value of the current that the power management chip 21 charges into the second battery 32 is regulated to a first preset current range, and the upper limit value of the first preset current range is less than the current value of the current output by the power management chip 21.

[0119] The trickle charging stage of the charging process here means that both the first battery 31 and the second battery 32 are in the trickle charging stage.

[0120] For example, the endpoint values of the above first preset current range can be less than or equal to the charging current value in the constant current stage of the second battery 32.

[0121] Thereby, it is possible to avoid damage to the second battery 32 caused by a large current charging into it, and thus the service life of the second battery 32 and the electronic device 100 can be improved. In addition, the above regulation can also make the current value of the current that the power management chip 21 charges into the first battery 31 larger, so that the charging efficiency of the first battery 31 and the electronic device 100 can be improved, the charging time can be shortened, and the charging cost can be reduced.

[0122] It can be understood that when the power management chip 21 detects that the battery 30 is in the trickle charging stage, a first enabling signal is transmitted to the second branch 42 of the regulation circuit 40. According to the first enabling signal, the second branch 42 provides a first voltage to the first branch 41 or the first branch 41 and the current limiting circuit 43, and regulates the current value of the current that the power management chip 21 charges into the second battery 32 to the first preset current range.

[0123] In other examples, in the above S200, regulating the current value of the current that the power management chip 21 charges into the second battery 32 through the regulation circuit 40 includes:

[0124] In the constant current stage of the charging process, through the regulation circuit 40, the current value of the current that the power management chip 21 charges into the second battery 32 is regulated to the current value of the current output by the power management chip 21.

[0125] The constant current stage of the charging process here means that both the first battery 31 and the second battery 32 are in the constant current charging stage.

[0126] For example, through the regulation circuit 40, the current value of the current that the power management chip 21 charges into the second battery 32 can be regulated to the magnitude of the rated charging current of the second battery 32. Thereby, the charging efficiency of the second battery 32 can be improved, and the charging time of the second battery 32 can be shortened.

[0127] Specifically, when the power management chip 21 detects that the battery 30 is in the constant current charging stage, it transmits a first enabling signal to the second branch 42 of the regulation circuit 40. According to the first enabling signal, the second branch 42 provides a first voltage to the first branch 41 or the first branch 41 and the current limiting circuit 43, and adjusts the current value of the current charged by the power management chip 21 into the second battery 32 to the rated charging current of the second battery 32.

[0128] In addition, when the electronic device 100 further includes the control circuit 20 in the above embodiment, and the control circuit 20 includes the protection circuit 60, when the power management chip 21 detects that the battery 30 is in the constant current charging stage, the power management chip 21 transmits a first enabling signal to the second branch 42, disconnects the electrical connection between the second branch 42 and the first branch 41, so that the first control terminal CT1 of the first branch 41 is not controlled by the second branch 42; the power management chip 21 transmits a second enabling signal to the protection circuit 60, and the first control terminal CT1 of the first branch 41 is controlled by the protection circuit 60. According to the second enabling signal, the protection circuit 60 conducts the path between the power management chip 21 or the first node N1 and the positive electrode of the second battery 32, so that the charging circuit of the power management chip 21 to the second battery 32 is conducted, and the current value of the current in this charging circuit is relatively large.

[0129] In some other examples, in the above S200, adjusting the current value of the current charged by the power management chip 21 into the second battery 32 through the regulation circuit 40 includes:

[0130] In the constant voltage stage of the charging process, the charging path between the power management chip 21 and the second battery 32 is disconnected through the regulation circuit 40.

[0131] The constant voltage stage of the charging process here refers to that both the first battery 31 and the second battery 32 are in the constant voltage charging stage.

[0132] Thus, it is possible to avoid damage to the second battery 32 caused by a relatively large current charged into it, and further improve the service life of the second battery 32 and the electronic device 100. In addition, the above adjustment can also make the current value of the current charged by the power management chip 21 into the first battery 31 relatively large, thereby improving the charging efficiency of the first battery 31 and the electronic device 100, shortening the charging time, and reducing the charging cost.

[0133] Specifically, when the power management chip 21 detects that the battery 30 is in the constant voltage charging stage, the power management chip 21 transmits a first enabling signal to the second branch 42, so that the charging path between the power management chip 21 and the second battery 32 is disconnected.

[0134] In addition, when the electronic device 100 further includes the control circuit 20 in the above embodiment and the control circuit 20 includes the protection circuit 60, when the power management chip 21 or the MCU detects that the battery 30 is in the constant voltage charging stage, the power management chip 21 transmits a first enabling signal to the second branch 42; according to the first enabling signal, the second branch 42 disconnects the electrical connection between the second branch 42 and the first branch 41; meanwhile, the power management chip 21 transmits a second enabling signal to the protection circuit 60, and according to the second enabling signal, the protection circuit 60 disconnects the path between the power management chip 21 or the first node N1 and the positive electrode of the second battery 32, so that the charging path of the power management chip 21 to the second battery 32 is disconnected.

[0135] In some other examples, in the above S200, adjusting the current value of the current that the power management chip 21 charges into the second battery 32 through the regulation circuit 40 includes:

[0136] In the constant voltage stage of the charging process, the current value of the current that the power management chip 21 charges into the second battery 32 is adjusted to a second preset current range through the regulation circuit 40, and the upper limit value of the second preset current range is less than the current value of the current output by the power management chip 21.

[0137] Specifically, when the power management chip 21 detects that the battery 30 is in the constant voltage charging stage, the power management chip 21 transmits a first enabling signal to the second branch 42, and according to the first enabling signal, the second branch 42 provides a first voltage to the first branch 41, and the first branch 41 adjusts the current value of the current that the power management chip 21 charges into the second battery 32 to the second preset current range according to the first voltage.

[0138] In addition, when the electronic device 100 further includes the control circuit 20 in the above embodiment and the control circuit 20 includes the protection circuit 60, when the power management chip 21 detects that the battery 30 is in the constant voltage charging stage, the power management chip 21 transmits a second enabling signal to the protection circuit 60, and according to the second enabling signal, the electrical connection between the protection circuit 60 and the first control terminal CT1 of the first branch 41 is disconnected; meanwhile, the power management chip 21 transmits a first enabling signal to the second branch 42; according to the first enabling signal, the second branch 42 provides a first voltage to the first branch 41 or the first branch 41 and the current limiting circuit 43, and adjusts the current value of the current that the power management chip 21 charges into the second battery 32 to the second preset current range.

[0139] When the electronic device is in the shutdown state or the shutdown and maintenance state, the voltages of the first battery 31 and the second battery 32 are unknown, the control circuit 20 is turned off and does not work, and the path between the second battery 32 and the first node N1 is in the disconnected state, so that the second battery 32 can be protected to avoid damage to the second battery 32 caused by the first battery 31 pouring a large current into the second battery 32.

[0140] When the electronic device is in the powered-on and non-charging state, when the electronic device detects that the voltage of the first battery 31 is low and the voltage of the second battery 32 is high, the triode Q1 receives the first enable signal from the power management chip 21 and conducts the loop between the first node N1 and the second battery 32, so that the second battery 32 charges the first battery 31 until the voltage of the first battery 31 is equal to or approximately equal to the voltage of the second battery 32, thereby protecting the first battery 31 and avoiding damage caused by the first battery 31 being in a low voltage state for a long time.

[0141] When the electronic device is in the powered-on and non-charging state, when the electronic device detects that the voltage of the first battery 31 is high and the voltage of the second battery 32 is low, the linear regulator LDO receives the second enable signal from the power management chip 21 and provides the first voltage to the first branch, so that the first battery 31 charges the second battery 32, and the charging current is small until the voltage of the first battery 31 is equal to or approximately equal to the voltage of the second battery 32, thereby protecting the second battery 32 and avoiding damage caused by the second battery 32 being in a low voltage state for a long time.

[0142] Some embodiments of the present disclosure also provide a computer-readable storage medium, which includes computer instructions. When the computer instructions run on a computer, the computer is caused to execute the charging control method described in any of the above embodiments.

[0143] The above computer-readable storage medium may include a read-only memory (ROM), a random access memory (RAM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), a one-time programmable read-only memory (OTPROM), an electrically-erasable programmable read-only memory (EEPROM), a compact disc read-only memory (CD-ROM), or other optical disc storage, magnetic disk storage, tape storage, or any other medium that can be used to carry or store data and is computer-readable.

[0144] As described above, the above are only specific embodiments of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present disclosure who thinks of changes or substitutions should be covered by the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be subject to the protection scope of the claims.

Claims

1. A control circuit, characterized in that, the control circuit includes: a power management chip for electrically connecting to a charger; a first battery and a second battery, the battery capacity of the first battery being greater than that of the second battery; the negative electrodes of the first battery and the second battery are both grounded; the positive electrode of the first battery is electrically connected to the power management chip; a regulation circuit electrically connected to the power management chip and the positive electrode of the second battery respectively; the regulation circuit is configured to adjust the current value of the current charged from the power management chip into the second battery.

2. The control circuit according to claim 1, characterized in that, the regulation circuit includes: a first branch and a second branch; the first branch includes: a first control end, a first output end and a first input end; the second branch includes: a second output end and a first enable end; the first control end of the first branch is electrically connected to the second output end of the second branch, the first input end of the first branch is electrically connected to the power management chip, and the first output end of the first branch is electrically connected to the positive electrode of the second battery; the first enable end of the second branch is coupled to the power management chip; the second branch is configured to receive a first enable signal from the power management chip and provide a first voltage to the first branch according to the first enable signal; the first branch is configured to adjust the current value of the current charged from the power management chip into the second battery according to the first voltage.

3. The control circuit according to claim 2, characterized in that, the first branch includes: a first transistor, a first diode, a second transistor, a second diode, and a first resistor; the first pole of the first transistor is electrically connected to the first pole of the second transistor, the control pole of the first transistor is electrically connected to the control pole of the second transistor, and the second pole of the first transistor is electrically connected to the power management chip; the second pole of the second transistor is electrically connected to the positive electrode of the second battery; the first end of the first resistor is electrically connected to the first pole of the first transistor, and the second end of the first resistor is electrically connected to the control pole of the first transistor; the anode of the first diode is electrically connected to the second pole of the first transistor, and the cathode of the first diode is electrically connected to the first pole of the first transistor; the anode of the second diode is electrically connected to the second pole of the second transistor, and the cathode of the second diode is electrically connected to the first pole of the second transistor.

4. The control circuit according to claim 3, characterized in that, both the first transistor and the second transistor are P-type metal oxide semiconductor field effect transistors.

5. The control circuit according to claim 4, characterized in that, the first diode is the body diode of the first transistor; the second diode is the body diode of the second transistor.

6. The control circuit according to claim 2, characterized in that, the second branch includes: a linear voltage regulator; the linear voltage regulator is electrically connected to the first control end of the first branch and is coupled to the power management chip.

7. The control circuit according to claim 2, wherein, the regulation circuit further includes: a current limiting circuit; the current limiting circuit includes a current limiting input end and a current limiting output end; the current limiting output end is electrically connected to the first control end of the first branch, and the current limiting input end is electrically connected to the second output end of the second branch; the current limiting circuit is configured to cooperate with the first branch to jointly adjust the current value charged into the second battery by the power management chip.

8. The control circuit according to claim 7, wherein, the current limiting circuit includes: a second resistor; the second resistor is electrically connected to the first control end of the first branch and the second output end of the second branch respectively.

9. The control circuit according to any one of claims 1 to 8, wherein, the control circuit further includes: a protection circuit; the protection circuit is coupled to the power management chip, and the protection circuit is electrically connected to the regulation circuit; the positive electrode of the first battery is electrically connected to the power management chip through a first node; the regulation circuit is electrically connected to the power management chip through the first node; the protection circuit is configured to receive a second enable signal from the power management chip, and according to the second enable signal, conduct or disconnect the path between the first node and the positive electrode of the second battery.

10. The control circuit according to claim 9, wherein, the protection circuit includes: a triode; the base of the triode is coupled to the power management chip, the collector of the triode is electrically connected to the regulation circuit, and the emitter of the triode is grounded.

11. The control circuit according to claim 9, wherein, when the regulation circuit includes the first branch and the second branch, the protection circuit is electrically connected to the first control end of the first branch.

12. The control circuit according to claim 9, wherein, when the regulation circuit includes the first branch, the second branch and the current limiting circuit, the protection circuit is electrically connected to the current limiting input end of the current limiting circuit.

13. An electronic device, wherein, the electronic device includes the control circuit according to any one of claims 1 to 12.

14. A charging control method, wherein, applied to an electronic device, the electronic device includes: a power management chip, a first battery, a second battery and a regulation circuit; the battery capacity of the first battery is greater than that of the second battery; the charging control method includes: detecting that the power management chip charges the first battery and the second battery; in response to detecting that the power management chip charges the first battery and the second battery, adjusting the current value of the current charged into the second battery by the power management chip through the regulation circuit.

15. The charging control method according to claim 14, wherein, Adjusting the current value of the current that the power management chip charges the second battery through the regulation circuit includes: in the trickle charging stage of the charging process, adjusting the current value of the current that the power management chip charges the second battery to a first preset current range through the regulation circuit, where the upper limit value of the first preset current range is less than the current value of the current output by the power management chip.

16. The charging control method according to claim 14, wherein, adjusting the current value of the current that the power management chip charges the second battery through the regulation circuit includes: in the constant current stage of the charging process, adjusting the current value of the current that the power management chip charges the second battery to the current value of the current output by the power management chip through the regulation circuit.

17. The charging control method according to claim 14, wherein, adjusting the current value of the current that the power management chip charges the second battery through the regulation circuit includes: in the constant voltage stage of the charging process, disconnecting the charging path between the power management chip and the second battery through the regulation circuit; or, in the constant voltage stage of the charging process, adjusting the current value of the current that the power management chip charges the second battery to a second preset current range through the regulation circuit, where the upper limit value of the second preset current range is less than the current value of the current output by the power management chip.

18. A computer-readable storage medium, wherein, the computer-readable storage medium includes computer instructions, and when the computer instructions run on a computer, the computer is caused to execute the charging control method according to any one of claims 14 to 17.

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