Charging management circuit and electronic device

Abstract

The application discloses a charging management circuit and an electronic device. The charging management circuit comprises a step-down charging module, a charge pump charging module and a protocol detection module. After an external charger is inserted, the real-time voltage of a battery is used to apply for a power supply voltage of the external charger, and the step-down charging module and / or the charge pump charging module are controlled to work in different charging modes according to the real-time voltage. Different power supply voltages and different charging modes can be switched according to the real-time voltage of the battery, so that the charging efficiency of the battery can be improved while the battery life and charging safety are considered.

Description

Technical Field

[0001] This application relates to the field of electronic circuit technology, specifically to a charging management circuit and electronic device. Background Technology

[0002] Battery charging typically offers only limited charging power, failing to meet users' demands for fast charging, while long charging wait times severely impact user experience.

[0003] In an effort to increase charging speed, simply using high voltage and / or high current can lead to reduced battery life and charging safety issues. Therefore, it's difficult to achieve both high efficiency and safety in battery charging strategies. Utility Model Content

[0004] This application provides a charging management circuit and electronic device to alleviate at least some of the aforementioned technical problems.

[0005] In a first aspect, this application provides a charging management circuit, which includes a buck charging module, a charging pump module, and a protocol detection module. The buck charging module is used to connect to a battery and is configured to charge the battery in trickle charging mode or constant voltage charging mode. The charging pump module is used to connect to the battery and is configured to charge the battery in fast charging mode. The protocol detection module is connected to the buck charging module, the charging pump module, and the battery. The protocol detection module is configured to request a power supply voltage from the external charger based on the real-time voltage of the battery after the external charger is plugged in, and to control the buck charging module and / or the charging pump module to operate in different charging modes based on the real-time voltage.

[0006] Secondly, this application also provides an electronic device that includes the aforementioned charging management circuit.

[0007] The charging management circuit and electronic device provided in this application, by requesting a power supply voltage from the external charger based on the real-time voltage of the battery after the external charger is plugged in, and controlling the buck charging module and / or charging pump charging module to work in different charging modes based on the real-time voltage, can switch between different power supply voltages and different charging modes according to the real-time voltage of the battery, thereby improving the charging efficiency of the battery while taking into account both battery life and charging safety. Attached Figure Description

[0008] The technical solution and other beneficial effects of this application will become apparent from the following detailed description of specific embodiments in conjunction with the accompanying drawings.

[0009] Figure 1 This is a schematic block diagram of the charging management circuit provided in an embodiment of this application.

[0010] Figure 2 The circuit diagram of the power supply control unit provided in the embodiment of this application.

[0011] Figure 3 The circuit diagram of the protocol detection unit provided in the embodiments of this application.

[0012] Figure 4 The circuit diagram of the step-down charging module provided in the embodiment of this application is shown.

[0013] Figure 5 The circuit diagram of the charging pump charging module provided in the embodiment of this application is shown.

[0014] Figure 6 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application. Detailed Implementation

[0015] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0016] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Features thus defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "multiple" means two or more unless otherwise explicitly specified.

[0017] like Figure 1 As shown, this embodiment provides a charging management circuit 100, which includes a buck charging module 20, a charging pump module 30, and a protocol detection module 10. The buck charging module 20 is connected to a battery 110 and is configured to charge the battery 110 in trickle charging mode or constant voltage charging mode. The charging pump module 30 is connected to the battery 110 and is configured to charge the battery 110 in fast charging mode. The protocol detection module 10 is connected to the buck charging module 20, the charging pump module 30, and the battery 110. The protocol detection module 10 is configured to request a power supply voltage from the external charger 120 based on the real-time voltage of the battery 110 after the external charger 120 is inserted, and to control the buck charging module 20 and / or the charging pump module 30 to operate in different charging modes based on the real-time voltage.

[0018] It is understood that the charging management circuit 100 provided in this embodiment requests a power supply voltage from the external charger 120 based on the real-time voltage of the battery 110 after the external charger 120 is inserted, and controls the buck charging module 20 and / or the charging pump charging module 30 to work in different charging modes based on the real-time voltage. It can switch between different power supply voltages and different charging modes according to the real-time voltage of the battery 110, thereby improving the charging efficiency of the battery 110 while taking into account the battery life and charging safety.

[0019] It should be noted that when the real-time voltage is lower than the first voltage threshold, the protocol detection module 10 requests the first power supply voltage from the external charger 120 and controls the buck charging module 20 to operate in trickle charging mode; when the real-time voltage is higher than the second voltage threshold, the protocol detection module 10 requests the second power supply voltage from the external charger 120 and controls the charging pump charging module 30 to operate in fast charging mode; when the real-time voltage is higher than the third voltage threshold, the buck charging module 20 operates in constant voltage charging mode; wherein, the first voltage threshold, the second voltage threshold, and the third voltage threshold increase sequentially, and the first power supply voltage and the second power supply voltage increase sequentially.

[0020] The battery 110 can be a single rechargeable battery. The first voltage threshold, second voltage threshold, and third voltage threshold can, for example, be 3V, 3.3V, and 4.1V respectively. The first supply voltage can, for example, be 5V, and the second supply voltage can, for example, be twice the real-time voltage of the battery 110. The external charger 120 can be, but is not limited to, a PD charger, or a charger supporting other protocols such as QC or UFCS.

[0021] In some embodiments, such as Figure 2 and Figure 3 As shown, the protocol detection module 10 includes a power supply control unit 11 and a protocol detection unit 12. The power supply control unit 11 is connected to the buck charging module 20 and the charging pump module 30. The power supply control unit 11 is also used to connect to the external charger 120 and control the transmission of the power supply voltage according to the control signal. The protocol detection unit 12 is connected to the buck charging module 20, the charging pump module 30 and the power supply control unit 11. The protocol detection unit 12 is configured to identify and request the power supply voltage from the external charger 120 based on the fast charging protocol supported by the external charger 120, and to control the buck charging module 20 and / or the charging pump module 30 to work in different charging modes according to the real-time voltage.

[0022] In some embodiments, such as Figure 2As shown, the power supply control unit 11 includes a first transistor Q2 and a first connector J1. The drain of the first transistor Q2 is connected to pins A4 / B9 and A9 / B4 of the first connector J1. The source of the first transistor Q2 outputs the power supply voltage, and the gate of the first transistor Q2 is connected to the NGATE1 signal. The first connector J1 is used for inserting an external charger 120.

[0023] It should be noted that the NGATE1 signal can control the switching of the first transistor Q2 to control the on / off state of the power supply path of the external charger 120.

[0024] In some embodiments, such as Figure 2 As shown, the power supply control unit 11 may also include at least one of a first resistor R2, a second resistor RS2, and a first capacitor C1.

[0025] The first end of the first resistor R2 is connected to the gate of the first transistor Q2, and the second end of the first resistor R2 is connected to the NGATE1 signal. The first resistor R2 can be used to prevent the NGATE1 signal from having too large a current and damaging the first transistor Q2.

[0026] The first terminal of the second resistor RS2 is connected to the source of the first transistor Q2, and the second terminal of the second resistor RS2 outputs the supply voltage. The second resistor RS2 can be used to detect the current in the transmission path of the supply voltage.

[0027] The first terminal of the first capacitor C1 is connected to the drain of the first transistor Q2, and the second terminal of the first capacitor C1 is connected to ground. The first capacitor C1 can be used to filter the drain voltage of the first transistor Q2.

[0028] Specifically, for the first connector J1, pins A4 / B9 and A9 / B4 are used to connect to the VBUS pin of the external charger 120, pins A1 / B12 and A12 / B1 are used to connect to the GND pin of the external charger 120 and ground, pin A5 is used to connect to the CC1 pin of the external charger 120, pins A6 and B6 are used to connect to the D+ pin of the external charger 120, pins B7 and A7 are used to connect to the D- pin of the external charger 120, pin B5 is used to connect to the CC2 pin of the external charger 120, and pin A8 is used to connect to the SBU1 pin of the external charger 120.

[0029] In some embodiments, such as Figure 3 As shown, the protocol detection unit 12 includes a first chip U1 and a first peripheral sub-circuit 121 that supports the normal operation of the first chip U1. The first chip U1 is connected to the buck charging module 20, the charging pump charging module 30 and the first peripheral sub-circuit 121.

[0030] It should be noted that the first chip U1 is a protocol chip, and its model can be, but is not limited to, SC2021 or SC2021A. The SC2021 or SC2021A has bidirectional full protocol function and microcontroller unit (MCU) function, and can support standard QC, PD and UFCS protocols.

[0031] In some embodiments, such as Figure 3 As shown, in the first peripheral sub-circuit 121, the first end of the second capacitor C37 is connected to the ground terminal, and the second end of the second capacitor C37 is connected to the third pin of the first chip U1 and the first power supply terminal (VDD5V).

[0032] The third resistor R3 is connected between the ground terminal and the 5th pin of the first chip U1.

[0033] The third capacitor C4 is connected between the ground terminal and pin 10 of the first chip U1.

[0034] The fourth resistor R8 is connected between the ground terminal and pin 15 of the first chip U1.

[0035] The fifth resistor R9 is connected between the first power supply terminal and pin 15 of the first chip U1.

[0036] The sixth resistor R5 is connected between pin 19 of the first chip U1 and the base of the first transistor Q6. The emitter of the first transistor Q6 is connected to pin 24 of the first chip U1. The seventh resistor R6 is connected between the collector of the first transistor Q6 and the ground terminal.

[0037] The eighth resistor R13 is connected between pin 18 of the first chip U1 and the base of the second transistor Q5. The emitter of the second transistor Q5 is connected to pin 25 of the first chip U1. The ninth resistor R130 is connected between the collector of the second transistor Q5 and the ground terminal.

[0038] The first end of the fourth capacitor C3 is connected to the ground terminal, and the second end of the fourth capacitor C3 is connected to pin 28 of the first chip U1.

[0039] The fifth capacitor C2 is connected between the ground terminal and pin 32 of the first chip U1.

[0040] The sixth capacitor C38 and the tenth resistor R7 are connected in parallel to the ground terminal and pin 27 of the first chip U1.

[0041] The seventh capacitor C39 and the eleventh resistor R1 are connected in parallel to the ground terminal and pin 26 of the first chip U1.

[0042] In some embodiments, such as Figure 3As shown, the first peripheral sub-circuit 121 also includes a second connector J3, a twelfth resistor R14, and a thirteenth resistor R15. The first pin of the second connector J3 is left floating, the second pin of the second connector J3 is connected to the ground terminal, the third pin of the second connector J3 is connected to the first end of the twelfth resistor R14 and the first end of the thirteenth resistor R15 and connected to a voltage of 3.3V, the second end of the twelfth resistor R14 is connected to the fourth pin of the second connector J3 and the 12th pin of the first chip U1, and the second end of the thirteenth resistor R15 is connected to the fifth pin of the second connector J3 and the 11th pin of the first chip U1.

[0043] In some embodiments, such as Figure 3 As shown, the first peripheral sub-circuit 121 also includes a third connector J4 for programming. The first pin of the third connector J4 is connected to the 32nd pin of the first chip U1, the second pin of the third connector J4 is connected to the 5th pin of the first chip U1, the third pin of the third connector J4 is connected to the ground terminal, the fourth pin of the third connector J4 is connected to the 9th pin of the first chip U1, and the fifth pin of the third connector J4 is connected to the 8th pin of the first chip U1.

[0044] Specifically, the source of the first transistor Q2 is connected to pins 23, 28, and 31 of the first chip U1; pin 24 of the first chip U1 is connected to pins A7 and B7 of the first connector J1; pin 25 of the first chip U1 is connected to pins A6 and B6 of the first connector J1; pin 26 of the first chip U1 is connected to pin B5 of the first connector J1; pin 27 of the first chip U1 is connected to pin A5 of the first connector J1; pin 29 of the first chip U1 is connected to the second terminal of the first resistor R2; pin 30 of the first chip U1 is connected to the first terminal of the second resistor RS2; and pin 32 of the first chip U1 is connected to pins A9 / B4 of the first connector J1. Pins 0, 2, and 16 of the first chip U1 are all grounded.

[0045] In some embodiments, such as Figure 4 As shown, the step-down charging module 20 includes a second chip U3 and a second peripheral sub-circuit 21 that supports the normal operation of the second chip U3. The second chip U3 is connected to the protocol detection module 10, the second peripheral sub-circuit 21 and the battery 110.

[0046] It should be noted that the second chip U3 is a step-down charging chip, and its model can be, but is not limited to, SC89890 or SC89890S. The SC89890S chip can step down charge a single battery at 110V and supports 18W charging.

[0047] In some embodiments, such as Figure 4 As shown, in the second peripheral sub-circuit 21, the first pin of the second chip U3 is connected to the second end of the second resistor RS2, the fifth pin of the second chip U3 is connected to the eleventh pin of the first chip U1, and the sixth pin of the second chip U3 is connected to the twelfth pin of the first chip U1.

[0048] In some embodiments, such as Figure 4 As shown, in the second peripheral sub-circuit 21, the first end of the fourteenth resistor R31 is connected to the first ends of the fifteenth resistor R32 and the sixteenth resistor R33 and connected to a 3.3V voltage. The second end of the fourteenth resistor R31 is connected to the fifth pin of the second chip U3. The second end of the fifteenth resistor R32 is connected to the sixth pin of the second chip U3. The second end of the sixteenth resistor R33 is connected to the seventh pin of the second chip U3 and connected to the interrupt signal INT_2. The seventeenth resistor R34 is connected between the ground terminal and the tenth pin of the second chip U3.

[0049] At least one of the eighth capacitor C22, the ninth capacitor C23, the tenth capacitor C24, the eleventh capacitor C25, and the twelfth capacitor C41 is connected between the ground terminal and the 13th pin of the second chip U3. The 13th pin of the second chip U3 is also connected to the 14th pin of the second chip U3 and the positive terminal (BAT+) of the battery 110.

[0050] At least one of the following capacitors—the thirteenth (C26), the fourteenth (C27), the fifteenth (C28), the sixteenth (C29), and the seventeenth (C40)—is connected to ground and pin 15 of the second chip U3. Pin 15 of the second chip U3 is also connected to pin 16 of the second chip U3 and the first terminal of the first inductor L1. The second terminal of the first inductor L1 is connected to the first terminal of the eighteenth resistor R35, pins 19 and 20 of the second chip U3, and the first terminal of the eighteenth capacitor C31. The second terminal of the eighteenth capacitor C31 is connected to the cathode of diode D1 and pin 21 of the second chip U3. The anode of diode D1 is connected to the second power supply terminal VCC. The second terminal of the eighteenth resistor R35 is connected to the first terminal of the nineteenth capacitor C30, and the second terminal of the nineteenth capacitor C30 is connected to ground. The first terminal of the twentieth capacitor C32 is connected to the second power supply terminal VCC and pin 22 of the second chip U3, and the second terminal of the twentieth capacitor C32 is connected to ground.

[0051] At least one of the following capacitors, C33 (21), C35 (22), and C36 (23), is connected between pin 23 of the second chip U3 and ground. Capacitor C34 (24) is connected between pin 24 of the second chip U3 and ground.

[0052] In some embodiments, such as Figure 4 As shown, the second peripheral sub-circuit 21 may also include a fourth connector J6, the first pin of the fourth connector J6 is connected to the 9th pin of the second chip U3, the second pin of the fourth connector J6 is connected to the 8th pin of the second chip U3, the third pin of the fourth connector J6 is connected to the 5th pin of the second chip U3, and the fourth pin of the fourth connector J6 is connected to the 6th pin of the second chip U3.

[0053] In some embodiments, such as Figure 5 As shown, the charging pump charging module 30 includes a third chip U2 and a third peripheral sub-circuit 31 that supports the normal operation of the third chip U2. The third chip U2 is connected to the protocol detection module 10, the third peripheral sub-circuit 31 and the battery 110.

[0054] It should be noted that the third chip U2 is a charge pump chip, and its model can be, but is not limited to, SC8551 or SC8551A. The third chip U2 can also be a chip that can support charge pump charging of a single 110 battery at a maximum of 8A 30W.

[0055] In some embodiments, such as Figure 5 As shown, in the third peripheral sub-circuit 31, the first end of the nineteenth resistor R17 is connected to the drain of the second transistor Q1 and the E7 pin of the third chip U2. The second end of the nineteenth resistor R17 is connected to the source of the second transistor Q1, the first end of the twenty-fifth capacitor C7, the first end of the twenty-sixth capacitor C8, and the C6, D6, E6, and F6 pins of the third chip U2. The second end of the twenty-fifth capacitor C7 is connected to the ground terminal. The second end of the twenty-sixth capacitor C8 is connected to the gate of the second transistor Q1 and the D7 pin of the third chip U2.

[0056] The first terminal of the twentieth resistor R30 is connected to the positive terminal of the battery 110. The second terminal of the twentieth resistor R30 is connected to the first terminals of the twenty-first resistor R28, the twenty-second resistor R26, and the H5 pin of the third chip U2. The second terminals of the twenty-first resistor R28 and the twenty-second resistor R26 are both grounded. The twenty-second resistor R26 is, for example, a variable resistor.

[0057] The first terminal of the twenty-seventh capacitor C5 is connected to the H6 pin of the third chip U2, the second terminal of the twenty-seventh capacitor C5 is connected to the H7 pin of the third chip U2 and the first terminal of the twenty-third resistor R19, and the second terminal of the twenty-third resistor R19 is connected to the ground terminal.

[0058] The twenty-eighth capacitor C6 is connected between the G6 pin of the third chip U2 and the ground terminal.

[0059] The first end of the twenty-fourth resistor R18 is connected to the first end of the twenty-fifth resistor R36 and is supplied with a voltage of 3.3V. The second end of the twenty-fourth resistor R18 is connected to the G7 pin of the third chip U2 and the 12th pin of the first chip U1. The second end of the twenty-fifth resistor R36 is connected to the F7 pin of the third chip U2 and the 11th pin of the first chip U1.

[0060] The first end of the twenty-sixth resistor R20 is connected to a voltage of 3.3V, and the second end of the twenty-sixth resistor R20 is connected to the C7 pin of the third chip U2 and connected to the interrupt signal INT_S.

[0061] The first terminal of the twenty-ninth capacitor C9 is connected to the positive terminal of the battery 110. The second terminal of the twenty-ninth capacitor C9 is connected to the first terminal of the thirtieth capacitor C10 and the B5, C5, D5, E5, F5 and G5 pins of the third chip U2. The second terminal of the thirtieth capacitor C10 is connected to the ground terminal.

[0062] The A1, B1, C1, D1, E1, F1, G1 and H1 pins of the third chip U2 are all connected to the ground terminal.

[0063] The first end of the twenty-seventh resistor R21 is connected to pin B6 of the third chip U2. The second end of the twenty-seventh resistor R21 is connected to the first end of the twenty-eighth resistor RS1 and the ground terminal. The second end of the twenty-eighth resistor RS1 is connected to the first end of the twenty-ninth resistor R22, the first end of the thirtieth resistor R23, and the negative terminal (BAT-) of the battery 110. The second end of the twenty-ninth resistor R22 is connected to pin A6 of the third chip U2. The second end of the thirtieth resistor R23 is connected to pin B7 of the third chip U2.

[0064] The first end of the thirty-first resistor R24 ​​is connected to pin A7 of the third chip U2, and the second end of the thirty-first resistor R24 ​​is connected to the positive terminal of the battery 110 and pin A3 of the third chip U2.

[0065] The first terminal of the thirty-second resistor R27 is connected to the positive terminal of the battery 110. The second terminal of the thirty-second resistor R27 is connected to the first terminals of the thirty-third resistor R25, the thirty-fourth resistor R29, and pin A5 of the third chip U2. The second terminals of the thirty-third resistor R25 and the thirty-fourth resistor R29 are both connected to the ground terminal. The thirty-fourth resistor R29 is, for example, a variable resistor.

[0066] At least one of the following capacitors is connected between pin A4 and pin A2 of the third chip U2: the thirty-first capacitor C11, the thirty-second capacitor C12, the thirty-third capacitor C13, and the thirty-fourth capacitor C14. Pin A4 of the third chip U2 is also connected to pin B4, pin C4, and pin D4 of the third chip U2. Pin A2 of the third chip U2 is also connected to pin B2, pin C2, and pin D2 of the third chip U2.

[0067] At least one of the thirty-fifth capacitor C15, the thirty-sixth capacitor C16, and the thirty-seventh capacitor C17 is connected between the A3 pin of the third chip U2 and the ground terminal. The A3 pin of the third chip U2 is also connected to the B3 pin, C3 pin, D3 pin, E3 pin, F3 pin, G3 pin, and H3 pin of the third chip U2.

[0068] At least one of the following capacitors is connected between pin E4 and pin E2 of the third chip U2: the thirty-eighth capacitor C18, the thirty-ninth capacitor C19, the fortieth capacitor C20, and the forty-first capacitor C21. Pin E4 of the third chip U2 is also connected to pins F4, G4, and H4 of the third chip U2. Pin E2 of the third chip U2 is also connected to pins F2, G2, and H2 of the third chip U2.

[0069] In summary, the charging management circuit 100 features automatic protocol identification, input / output overcurrent and overvoltage protection, overcharge and over-discharge protection for the battery 110, and short-circuit protection. Its specific operating process is as follows: When the protocol chip (U1) detects that the PD charger is plugged in, it automatically requests voltage from the PD charger. When the battery voltage is below 3V, the SC2021A controls the SC89890S to work in trickle charging mode and requests 5V voltage from the PD charger. When the battery voltage rises to 3.3V, the SC2021A controls the SC8551A to work and requests twice the battery voltage from the PD charger to start charge pump (CP) charging. The battery charging current can reach up to 8A. When the battery voltage is above 4.1V, the SC2021A controls the SC89890S to work in constant voltage (CP) charging mode.

[0070] In some embodiments, such as Figure 6 As shown, this embodiment also provides an electronic device 200, which includes the charging management circuit 100 described above. The electronic device 200 may be, but is not limited to, portable devices such as mobile phones and tablets, and may also be a device with a single rechargeable battery 110.

[0071] It is understood that since the electronic device 200 provided in this embodiment includes the above-mentioned charging management circuit 100, it can also request a power supply voltage from the external charger 120 according to the real-time voltage of the battery 110 after the external charger 120 is inserted, and control the buck charging module 20 and / or the charging pump charging module 30 to work in different charging modes according to the real-time voltage. It can switch different power supply voltages and different charging modes according to the real-time voltage of the battery 110, thereby improving the charging efficiency of the battery 110 while taking into account the battery life and charging safety.

[0072] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0073] This article uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the technical solutions and core ideas of this application. Those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. These modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A charging management circuit, characterized in that, The charging management circuit includes: A step-down charging module is used to connect to a battery and is configured to charge the battery in either trickle charging mode or constant voltage charging mode. A charging pump module, for connecting to the battery, is configured to charge the battery in a fast charging mode; The protocol detection module, connected to the buck charging module, the charging pump module, and the battery, is configured to request a power supply voltage from the external charger based on the real-time voltage of the battery after the external charger is plugged in, and to control the buck charging module and / or the charging pump module to operate in different charging modes based on the real-time voltage.

2. The charging management circuit according to claim 1, characterized in that, When the real-time voltage is lower than the first voltage threshold, the protocol detection module requests the first power supply voltage from the external charger and controls the buck charging module to work in trickle charging mode. When the real-time voltage is higher than the second voltage threshold, the protocol detection module requests a second power supply voltage from the external charger and controls the charging pump module to work in fast charging mode. When the real-time voltage is higher than the third voltage threshold, the buck charging module operates in constant voltage charging mode; The first voltage threshold, the second voltage threshold, and the third voltage threshold increase sequentially, as do the first power supply voltage and the second power supply voltage.

3. The charging management circuit according to claim 2, characterized in that, The protocol detection module includes: The power supply control unit is connected to the step-down charging module and the charging pump module, and is also used to connect to the external charger and control the transmission of the power supply voltage according to the control signal; The protocol detection unit, connected to the buck charging module, the charging pump module, and the power supply control unit, is configured to identify and request the power supply voltage from the external charger based on the fast charging protocol supported by the external charger, and to control the buck charging module and / or the charging pump module to operate in different charging modes according to the real-time voltage.

4. The charging management circuit according to claim 3, characterized in that, The protocol detection unit includes a first chip and a first peripheral sub-circuit supporting the normal operation of the first chip. The first chip is connected to the buck charging module, the charging pump charging module, and the first peripheral sub-circuit.

5. The charging management circuit according to claim 4, characterized in that, The first chip is a protocol chip.

6. The charging management circuit according to any one of claims 1-5, characterized in that, The step-down charging module includes a second chip and a second peripheral sub-circuit that supports the normal operation of the second chip. The second chip is connected to the protocol detection module, the second peripheral sub-circuit, and the battery.

7. The charging management circuit according to claim 6, characterized in that, The second chip is a step-down charging chip.

8. The charging management circuit according to any one of claims 1-5, characterized in that, The charging pump module includes a third chip and a third peripheral sub-circuit that supports the normal operation of the third chip. The third chip is connected to the protocol detection module, the third peripheral sub-circuit, and the battery.

9. The charging management circuit according to claim 8, characterized in that, The third chip is a charging pump chip.

10. An electronic device, characterized in that, The electronic device includes the charging management circuit as described in any one of claims 1-9.

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