Charging Circuit and Electronic Device

Abstract

An embodiment of the present application provides a charging circuit and an electronic device. The charging circuit includes a charging interface, a power management unit, a first buck module, and a second buck module. The charging interface is used to connect to a charger and receive a charging signal input through the charger. When the type of the charger is the first type, the charging signal is step-down processed through a first path to obtain a first voltage signal, and the power management unit supplies power to the power consumption system according to the first voltage signal. When the type of the charger is the second type, the charging signal is step-down processed through a second path to obtain a second voltage signal, and the power management unit supplies power to the power consumption system according to the second voltage signal to improve the total charging efficiency of the charging circuit. Wherein, the first path includes the second buck module; the second path includes the first buck module and the second buck module.

Description

Technical Field

[0001] This application relates to the technical field of circuit design, and more particularly, to a charging circuit and an electronic device. Background Art

[0002] With the continuous improvement of the performance of intelligent terminal devices, the power consumption of the system is increasing, and users have higher and higher requirements for the charging speed and battery life of terminal devices. The development of fast charging technology is changing with each passing day. At present, the mainstream solution of high-voltage fast charging technology is the scheme of charging two batteries in series.

[0003] When using a charger with high-voltage fast charging to charge a terminal device, it is necessary to step down the charging signal input through the charger by a first voltage conversion chip and then step down the charging signal again by a second voltage conversion chip to adjust the voltage of the charging signal to a supply voltage within the range that meets the power supply requirements of the power consumption system.

[0004] When using a 5V 1A / 2A charger to charge a terminal device, it is necessary to step up the charging signal input through the charger by a first voltage conversion chip and then step down the charging signal again by a second voltage conversion chip to adjust the voltage of the charging signal to a supply voltage within the range that meets the power supply requirements of the power consumption system.

[0005] Charging a terminal device with a charger through the existing charging method results in a relatively low total charging efficiency of the terminal device. Summary of the Invention

[0006] Embodiments of this application provide a charging circuit to solve the problem of relatively low total charging efficiency of the charging circuit in the prior art.

[0007] In a first aspect, embodiments of this application provide a charging circuit, which includes: a charging interface, a power management unit, a first buck module, and a second buck module;

[0008] The charging interface is used to connect to a charger and receive the charging signal input through the charger;

[0009] The input end of the first buck module is connected to the first pin of the charging interface, the output end of the first buck module is connected to the input end of the second buck module, and the output end of the second buck module is connected to the first end of the power management unit; the second end of the power management unit is connected to the power consumption system;

[0010] When the type of the charger is the first type, the charging signal is stepped down through the first path to obtain a first voltage signal, and the power management unit supplies power to the power consumption system according to the first voltage signal; when the type of the charger is the second type, the charging signal is stepped down through the second path to obtain a second voltage signal, and the power management unit supplies power to the power consumption system according to the second voltage signal, so as to improve the total charging efficiency of the charging circuit;

[0011] Wherein, the first path includes the second buck module; the second path includes the first buck module and the second buck module.

[0012] In a second aspect, an embodiment of the present application further provides an electronic device, which includes:

[0013] The charging circuit according to the first aspect of the present application.

[0014] In the embodiment of the present application, when using a high-voltage fast-charging charger to supply power to the power consumption system through the charging circuit of this embodiment, the charging signal is stepped down by the first buck module and the second buck module; when using a 5V1A / 2A charger to supply power to the power consumption system through the charging circuit of this embodiment, only the second buck module is required to step down the charging signal; in this way, the total charging efficiency of the charging circuit can be improved, and the voltage ripple of the voltage signal supplying power to the power consumption system can also be reduced, enhancing the stability of the charging circuit in supplying power to the power consumption system. Description of the Drawings

[0015] The drawings incorporated in the specification and constituting a part of the specification illustrate embodiments of the present application, and together with the description are used to explain the principles of the present application.

[0016] Figure 1 It is a schematic structural diagram of the first charging circuit provided by the embodiment of the present application;

[0017] Figure 2 It is a schematic structural diagram of the second charging circuit provided by the embodiment of the present application;

[0018] Figure 3 It is a schematic structural diagram of the third charging circuit provided by the embodiment of the present application;

[0019] Description of the Reference Numerals:

[0020] 1000 - Charging circuit; 1100 - Charging interface; 1200 - Power management unit; 1300 - First buck module; 1400 - Second buck module; 1500 - First switch; 1600 - Second switch; 1700 - Charging module; 1800 - Processing module; 1900 - Level conversion module; 11000 - Overvoltage protection module. Detailed implementation manners

[0021] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0022] This embodiment provides a charging circuit.

[0023] Figure 1 It is a schematic structural diagram of the charging circuit according to the embodiment of the present application.

[0024] As Figure 1 shown, the charging circuit 1000 may include a charging interface 1100, a power management unit 1200, a first buck module 1300, and a second buck module 1400.

[0025] The charging interface 1100 is used to connect to a charger 2000 and receive a charging signal input through the charger 2000.

[0026] In one example, the charging interface 1100 may be a Type-C interface. The charging interface 1100 may have a first pin and a second pin. Among them, the first pin may be a power pin VBUS, and the second pin may be a pair of differential pins DP and DM.

[0027] The first buck module 1300 has an input end and an output end. The first buck module 1300 is configured to step down the signal input to its input end and then output it through its output end.

[0028] The second buck module 1400 has an input end and an output end. The second buck module 1400 is configured to step down the signal input to its input end and then output it through its output end.

[0029] The input end of the first buck module 1300 is connected to the first pin of the charging interface 1100, and the output end of the first buck module 1300 is connected to the input end of the second buck module 1400; the output end of the second buck module 1400 is connected to the first end of the power management unit 1200, and the second end of the power management unit 1200 is connected to the power consumption system 3000.

[0030] The power consumption system 3000 can be in the same electronic device as the charging circuit 1000. When the charging interface 1100 of the charging circuit 1000 is connected to a charger and the other end of the charger is connected to the power grid, the charging circuit 1000 can supply power to the power consumption system 3000.

[0031] When the type of the charger 2000 is the first type, the charging signal is step - down processed through the first path to obtain a first voltage signal, and the power management unit 1200 supplies power to the power consumption system 3000 according to the first voltage signal; when the type of the charger 2000 is the second type, the charging signal is step - down processed through the second path to obtain a second voltage signal, and the power management unit 1200 supplies power to the power consumption system 3000 according to the second voltage signal, so as to improve the total charging efficiency of the charging circuit 1000;

[0032] Among them, the first path includes the second step - down module 1400 and does not include the first step - down module 1300; the second path includes the first step - down module 1300 and the second step - down module 1400.

[0033] When the type of the charger 2000 is the first type, the charger 2000 can be a high - voltage fast - charging charger. When the type of the charger 2000 is the second type, the charger 2000 can be a 5V 1A / 2A charger.

[0034] In this embodiment, when the type of the charger 2000 connected to the charging interface 1100 is the first type, the charging signal is step - down processed through the first path, that is, the first step - down module 1300 does not work, and the charging signal input by the charging interface 1100 is directly input to the second step - down module 1400, and the second step - down module 1400 step - down processes the charging signal to obtain a first voltage signal.

[0035] When the voltage of the charging signal is VBUS and the step - down efficiency of the second step - down module 1400 is η2, the voltage U1 of the first voltage signal can be expressed as:

[0036] U1 = VBUS * η2

[0037] In this embodiment, when the type of the charger 2000 connected to the charging interface 1100 is the second type, the charging signal is step - down processed through the second path, that is, the first step - down module 1300 can perform a first step - down process on the input charging signal to obtain a fourth voltage signal and provide the fourth voltage signal to the second step - down module 1400. The second step - down module 1400 can perform a second step - down process on the input fourth voltage signal to obtain a second voltage signal.

[0038] When the voltage of the charging signal is VBUS, the step-down efficiency of the first step-down module 1300 is η1, and the step-down efficiency of the second step-down module 1400 is η2, the voltage U4 of the fourth voltage signal can be expressed as:

[0039] U4 = VBUS * η1

[0040] The voltage U2 of the second voltage signal can be expressed as:

[0041] U2 = U4 * η2 = VBUS * η1 * η2

[0042] When using a charger with high-voltage fast charging to supply power to the power consumption system through the charging circuit of this embodiment, the charging signal is step-down processed by the first step-down module and the second step-down module; when using a 5V 1A / 2A charger to supply power to the power consumption system through the charging circuit of this embodiment, only the second step-down module is required to step-down the charging signal; in this way, the total charging efficiency of the charging circuit can be improved, and the voltage ripple of the voltage signal supplying power to the power consumption system can also be reduced, enhancing the stability of the charging circuit in supplying power to the power consumption system.

[0043] In one embodiment of the present disclosure, as Figure 2 shown, the charging circuit 1000 may further include a first switch 1500 and a second switch 1600.

[0044] The first end of the first switch 1500 is connected to the input end of the first step-down module 1300, and the second end of the first switch is connected to the input end of the second step-down module 1400.

[0045] The first end of the second switch 1600 is connected to the input end of the first step-down module 1300, and the second end of the second switch 1600 is connected to the input end of the second step-down module 1400.

[0046] The power management unit 1200 is configured to control the first switch 1500 to conduct and the second switch 1600 to disconnect when the type of the charger 2000 is the first type, so that the charging signal is step-down processed through the first path.

[0047] When the first switch 1500 conducts and the second switch 1600 disconnects, the first step-down module 1300 is short-circuited and cannot step-down the charging signal. The first switch 1500 can also transmit the charging signal to the second step-down module 1400, and the second step-down module steps down the charging signal to obtain the first voltage signal.

[0048] The power management unit 1200 is configured to control the first switch 1500 to turn off and the second switch 1600 to turn on when the charger 2000 is of the second type, so that the charging signal is step - down processed through the second path.

[0049] When the first switch 1500 is turned off and the second switch 1600 is turned on, the charging signal is transmitted to the first step - down module 1300. The first step - down module 1300 performs a first step - down process on the charging signal to obtain a fourth voltage signal, and provides the fourth voltage signal to the second step - down module 1400 through the turned - on second switch 1600. The second step - down module 1400 may perform a second step - down process on the input fourth voltage signal to obtain a second voltage signal.

[0050] In one example, the first switch 1500 can be a MOS transistor or a transistor, and the second switch 1600 can also be a MOS transistor or a transistor.

[0051] Further, the second pin of the charging interface 1100 can be connected to the third terminal of the power management unit 1200. When the charger 2000 is connected to the charging interface 1100, the charger 2000 sends an identification signal to the power management unit 1200 through the charging interface 1100. The power management unit 1200 determines the type of the charger 2000 according to the identification signal. Here, the identification signal is sent by the charger 2000.

[0052] In this embodiment, the power management unit 1200 may send an identification request to the charger through the charging interface 1100 when the charging interface 1100 is connected to the power grid through the charger 2000. The charger responds to the identification request and returns an identification signal to the power management unit 1200 through the charging interface 1100. The identification signal may include information representing the voltage of the charging signal provided by the charger.

[0053] The power management unit 1200 determines that the type of the charger is the first type or the second type according to the information representing the voltage of the charging signal provided by the charger included in the identification signal.

[0054] In an embodiment of the present disclosure, the fourth terminal of the power management unit 1200 is connected to the third terminal of the first switch 1500, and the fifth terminal of the power management unit 1200 is connected to the third terminal of the second switch 1600.

[0055] The power management unit 1200 outputs a first control signal through the fourth terminal, and the first control signal is a signal for controlling the switching state of the first switch 1500.

[0056] The power management unit 1200 outputs a second control signal through a fifth terminal, and the second control signal is a signal for controlling the switching state of the second switch 1600.

[0057] In this embodiment, when the type of the charger 2000 is the first type, the power management unit 1200 may output a first control signal for controlling the first switch 1500 to conduct, and a second control signal for controlling the second switch 1600 to disconnect. When the type of the charger 2000 is the second type, the power management unit 1200 may also output a first control signal for controlling the first switch 1500 to disconnect, and a second control signal for controlling the second switch 1600 to conduct.

[0058] In one embodiment of the present disclosure, as Figure 3 shown, the charging circuit may further include a charging module 1700.

[0059] The first terminal of the charging module 1700 is used to connect to the first terminal of the battery 4000, and the second terminal of the charging module 1700 is connected to the input terminal of the first buck module 1300.

[0060] When the type of the charger is the first type, the charging module 1700 may step down the charging signal to obtain a third voltage signal, and charge the battery 4000 according to the third voltage signal.

[0061] In this way, when the type of the charger is the first type, the battery can also be charged through the charging circuit of this embodiment.

[0062] On this basis, the charging module 1700 may also be set to stop working when the type of the charger is the second type, that is, stop charging the battery 4000.

[0063] Further, the first terminal of the battery is also connected to the output terminal of the first buck module 1300. When the type of the charger is the second type, the first buck module 1300 may also step down the charging signal to obtain a fourth voltage signal, and charge the battery according to the fourth voltage signal.

[0064] When the type of the charger is the second type, the charging module 1700 stops charging the battery 4000. Therefore, the first buck module 1300 may step down the charging signal to obtain a fourth voltage signal, and charge the battery according to the fourth voltage signal.

[0065] In one embodiment of the present disclosure, as Figure 3 shown, the charging circuit may further include a processing module 1800. The power consumption system 3000 may include a central processing unit of an electronic device.

[0066] The first end of the power consumption system 3000 is connected to the second end of the power management unit 1200, the second end of the power consumption system 3000 is connected to the fifth end of the power management unit 1200, the third end of the power consumption system 3000 is connected to the first end of the processing module 1800, and the second end of the processing module 1800 is connected to the third end of the charging module 1700.

[0067] The power management unit 1200 transmits the type of the charger to the power consumption system 3000 for the power consumption system 3000 to send a target signal to the processing module, where the target signal is a signal reflecting the type of the charger 2000.

[0068] When the type of the charger is the first type, the processing module 1800 can control the charging module 1700 to work; when the type of the charger is the second type, the processing module 1800 can control the charging module 1700 to stop working.

[0069] In this embodiment, the power management unit 1200 may not be able to directly control the charging module 1700. Therefore, it is necessary to control whether the charging module 1700 works through the processing module 1800.

[0070] In one example, the processing module 1800 can be provided by a microcontroller unit (MCU).

[0071] In an embodiment of the present disclosure, as Figure 3 shown, the charging circuit may further include a level conversion module 1900. The input end of the level conversion module 1900 is connected to the third end of the power consumption system 3000, and the output end of the level conversion module 1900 is connected to the first end of the processing module 1800.

[0072] The level conversion module 1900 can perform conversion processing on the level of the target signal.

[0073] In this embodiment, the voltage supported by the third end of the power consumption system 3000 may not match the voltage supported by the first end of the processing module 1800. Therefore, by performing level conversion processing on the target signal through the level conversion module 1900, communication can be established between the power consumption system 3000 and the processing module 1800, that is, the processing module 1800 can receive the target signal sent by the power consumption system 3000.

[0074] In an embodiment of the present disclosure, as Figure 3 shown, the charging circuit may further include an overvoltage protection module 11000. The first end of the overvoltage protection module 11000 is connected to the first pin of the charging interface 1100, and the second end of the overvoltage protection module 11000 is connected to the input end of the first step-down module 1300.

[0075] When the voltage of the charging signal is greater than or equal to the voltage threshold corresponding to the type of the charger, the power management unit 1200 may control the overvoltage protection module 11000 to disconnect, so that the charging circuit 1000 stops supplying power to the power consumption system 3000.

[0076] In this embodiment, when the type of the charger is the first type, the corresponding voltage threshold may be the first voltage threshold, and when the type of the charger is the second type, the corresponding voltage threshold may be the second voltage threshold.

[0077] Then, when the type of the charger is the first type, the power management unit 1200 may control the overvoltage protection module 11000 to disconnect when the voltage of the charging signal is greater than or equal to the first voltage threshold, so that the charging circuit 1000 stops supplying power to the power consumption system 3000.

[0078] When the type of the charger is the second type, the power management unit 1200 may control the overvoltage protection module 11000 to disconnect when the voltage of the charging signal is greater than or equal to the second voltage threshold, so that the charging circuit 1000 stops supplying power to the power consumption system 3000.

[0079] In this embodiment, the overvoltage protection module 11000 may be a controllable switch. The overvoltage protection module 11000 may further have a third terminal, and the seventh terminal of the power management unit 1200 is connected to the third terminal of the overvoltage protection module 11000. The power management unit 1200 may further output a third control signal through the seventh terminal, and the third control signal is used to control the switching state of the overvoltage protection module 11000.

[0080] In one example, the overvoltage protection module 11000 may be a MOS transistor or a transistor.

[0081] Through the charging circuit of this embodiment, overvoltage protection can be performed on the charging circuit.

[0082] The present disclosure further provides an electronic device, and the electronic device may include the charging circuit of any of the foregoing embodiments.

[0083] The electronic device in the embodiments of the present application may be a device, or a component, an integrated circuit, or a chip in a terminal. The device may be a mobile electronic device or a non-mobile electronic device. Exemplarily, the mobile electronic device may be a mobile phone, a tablet computer, a laptop computer, a palmtop computer, a vehicle-mounted electronic device, a wearable device, an ultra-mobile personal computer (UMPC), a netbook, or a personal digital assistant (PDA), etc., and the non-mobile electronic device may be a server, a Network Attached Storage (NAS), a personal computer (PC), a television (TV), a teller machine, or a self-service machine, etc. The embodiments of the present application do not make specific limitations.

[0084] It should be noted that, in this document, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, such that a process, method, article or device including a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the phrase "including a..." does not exclude the existence of additional identical elements in the process, method, article or device including such element.

[0085] The embodiments of the present application have been described above in conjunction with the accompanying drawings. However, the present application is not limited to the above specific embodiments. The above specific embodiments are merely illustrative and not restrictive. Under the inspiration of the present application, those of ordinary skill in the art can also make many forms without departing from the purpose of the present application and the scope protected by the claims, and all of them fall within the protection scope of the present application.

Claims

1. A charging circuit, characterized in that, Comprising: a charging interface (1100), a power management unit (1200), a first step-down module (1300), and a second step-down module (1400); The charging interface (1100) is used to connect to a charger and receive a charging signal input through the charger; The input end of the first step-down module (1300) is connected to the first pin of the charging interface (1100), the output end of the first step-down module (1300) is connected to the input end of the second step-down module (1400), and the output end of the second step-down module (1400) is connected to the first end of the power management unit (1200); the second end of the power management unit (1200) is connected to an electrical system; When the type of the charger is the first type, the charging signal is step-down processed through a first path to obtain a first voltage signal, and the power management unit (1200) supplies power to the electrical system according to the first voltage signal; when the type of the charger is the second type, the charging signal is step-down processed through a second path to obtain a second voltage signal, and the power management unit (1200) supplies power to the electrical system according to the second voltage signal to improve the total charging efficiency of the charging circuit; Wherein, the first path includes the second step-down module (1400); the second path includes the first step-down module (1300) and the second step-down module (1400); The second pin of the charging interface (1100) is connected to the third end of the power management unit (1200); When the charger is connected to the charging interface, the charger sends an identification signal to the power management unit (1200) through the charging interface, and the power management unit (1200) determines the type of the charger according to the identification signal, wherein the identification signal is sent by the charger.

2. The charging circuit according to claim 1, wherein The charging circuit further includes a first switch (1500) and a second switch (1600), The first end of the first switch (1500) is connected to the input end of the first step-down module (1300), and the second end of the first switch (1500) is connected to the input end of the second step-down module (1400); The first end of the second switch (1600) is connected to the output end of the first step-down module (1300); the second end of the second switch (1600) is connected to the input end of the second step-down module (1400); When the type of the charger is the first type, the power management unit (1200) controls the first switch (1500) to conduct and the second switch (1600) to disconnect, so that the charging signal is step-down processed through the first path; When the type of the charger is the second type, the power management unit (1200) controls the first switch (1500) to disconnect and the second switch (1600) to conduct, so that the charging signal is step-down processed through the second path.

3. The charging circuit according to claim 2, wherein The fourth terminal of the power management unit (1200) is connected to the third terminal of the first switch (1500), and the fifth terminal of the power management unit (1200) is connected to the third terminal of the second switch (1600); The power management unit (1200) outputs a first control signal through the fourth terminal, and the first control signal is a signal for controlling the switching state of the first switch (1500); The power management unit (1200) outputs a second control signal through the fifth terminal, and the second control signal is a signal for controlling the switching state of the second switch (1600).

4. The charging circuit according to claim 1, wherein The charging circuit further includes a charging module (1700); The first terminal of the charging module (1700) is connected to the first terminal of the battery, and the second terminal of the charging module (1700) is connected to the input terminal of the first buck module (1300); When the type of the charger is the first type, the charging module (1700) performs a buck processing on the charging signal to obtain a third voltage signal, and charges the battery according to the third voltage signal.

5. The charging circuit according to claim 4, wherein The first terminal of the battery is further connected to the output terminal of the first buck module (1300); When the type of the charger is the second type, the first buck module (1300) performs a buck processing on the charging signal to obtain a fourth voltage signal, and charges the battery according to the fourth voltage signal.

6. The charging circuit according to claim 5, wherein The charging circuit further includes a processing module (1800); The first terminal of the power consumption system is connected to the second terminal of the power management unit (1200), and the second terminal of the power consumption system is connected to the sixth terminal of the power management unit (1200); the third terminal of the power consumption system is connected to the first terminal of the processing module (1800); the second terminal of the processing module (1800) is connected to the third terminal of the charging module (1700); The power management unit (1200) transmits the type of the charger to the power consumption system for the power consumption system to send a target signal to the processing module (1800), where the target signal is a signal reflecting the type of the charger; When the type of the charger is the first type, the processing module (1800) controls the charging module (1700) to work; when the type of the charger is the second type, the processing module (1800) controls the charging module (1700) to stop working.

7. The charging circuit according to claim 6, wherein The charging circuit further includes a level conversion module (1900); The input terminal of the level conversion module (1900) is connected to the third terminal of the power consumption system, and the output terminal of the level conversion module (1900) is connected to the first terminal of the processing module (1800); The level conversion module (1900) performs a conversion processing on the level of the target signal.

8. The charging circuit according to claim 2, wherein The charging circuit further includes an overvoltage protection module (11000), The first end of the overvoltage protection module (11000) is connected to the first pin of the charging interface (1100), and the second end of the overvoltage protection module (11000) is connected to the input end of the first step-down module (1300); When the voltage of the charging signal is greater than or equal to the voltage threshold corresponding to the charger type, the power management unit (1200) controls the overvoltage protection module (11000) to disconnect, so that the charging circuit stops supplying power to the power consumption system.

9. An electronic device, characterized in that, A charging circuit according to any one of claims 1 to 8 is included.

Images