A voltage switching method, device and storage medium for charging control

Abstract

The present application discloses a voltage switching method, device and storage medium for charging control, which are used to control a charging circuit and improve the stability during voltage switching when charging. The method of the present application includes: when outputting voltage to a first power receiving device through a first switch module and the output voltage is greater than 5V, the controller detects that a second power receiving device is inserted; the controller controls the fourth switch module to conduct, so as to output 5V voltage to the second power receiving device; if the required voltage requested by the second power receiving device is the same as the voltage output to the first power receiving device, the controller controls the buck module to raise the voltage to the required voltage; the controller controls the second switch module to turn on, so as to output the required voltage to the second power receiving device through the second switch module; the controller controls the fourth switch module to turn off, so as to disconnect the required voltage output to the second power receiving device.

Description

Technical Field

[0001] This application relates to the field of circuit control technologies, and particularly to a charging circuit control method, apparatus, and computer-readable storage medium. Background Art

[0002] In recent years, with the development of fast charging technologies, various fast charging technologies have been increasingly widely applied. When a mobile terminal, such as a mobile phone or a tablet computer, is fast charging, it will apply for a fast charging voltage from a fast charging power supply device with a fast charging chip, such as a fast charging mobile power supply or a fast charging adapter, etc., through a fast charging protocol, so as to shorten the charging time of the mobile terminal. Taking a fast charging mobile power supply with a fast charging chip as an example, the current fast charging mobile power supply can output voltages of different voltage levels such as 9V, 12V, 15V, 20V, 28V, 36V, or 48V according to the fast charging protocol. For example, the QC protocol 2.0 can apply for voltages of 9V or 12V, and the PD protocol can apply for voltages of 9V, 12V, 15V, 20V, 28V, 36V, or 48V.

[0003] During the existing charging process for multiple devices, due to the coupling capacitance on the power supply pins and signal lines, if the voltage suddenly changes, a large current will pass through the signal lines, ultimately causing the signal lines to be interfered with, resulting in device communication failure or even charging interruption. Based on this, this application provides a charging circuit control method, apparatus, and computer-readable storage medium to improve the stability of voltage switching during the charging process. Summary of the Invention

[0004] To solve the above technical problems, this application provides a voltage switching method, apparatus, and storage medium for charging control.

[0005] In a first aspect of this application, a voltage switching method for charging control is provided. The method is applied to a charging circuit, and the charging circuit is provided with: a first switch module, a second switch module, a third switch module, a fourth switch module, a buck module, a controller, an input terminal, a first output terminal, and a second output terminal that are mutually coupled. The input terminal is used to connect to a power supply, the first output terminal and the second output terminal are used to connect to a power receiving device, the first output terminal is connected to the buck module through the third switch module, the second output terminal is connected to the buck module through the fourth switch module, the input terminal is connected to the first output terminal through the first switch module, the input terminal is connected to the second output terminal through the second switch module, and the method includes:

[0006] When a voltage is being output to a first power receiving device through the first switch module and the output voltage is greater than 5V, the controller detects the insertion of a second power receiving device;

[0007] The controller controls the fourth switch module to conduct, thereby outputting a 5V voltage to the second power receiving device;

[0008] If the required voltage requested by the second power receiving device is the same as the voltage output to the first power receiving device, the controller controls the buck module to raise the voltage to the required voltage;

[0009] The controller controls the second switch module to turn on, thereby outputting the required voltage to the second power receiving device through the second switch module;

[0010] The controller controls the fourth switch module to turn off, so as to disconnect the required voltage output to the second power receiving device.

[0011] Optionally, the first switch module, the second switch module, the third switch module, and the fourth switch module are MOSFET switch modules, or composed of PMOS, or composed of NMOS.

[0012] Optionally, the required voltage is 9V, 12V, 15V, 20V, 28V, 36V or 48V.

[0013] Optionally, the buck module includes: a BUCK buck chip, a first capacitor, a second capacitor, and an inductor.

[0014] A second aspect of the present application provides another voltage switching method for charging control. The method is applied to a charging circuit, and the charging circuit is provided with: a first switch module, a second switch module, a third switch module, a fourth switch module, a buck module, a controller, an input terminal, a first output terminal, and a second output terminal that are mutually coupled. The input terminal is used to connect to a power supply, the first output terminal and the second output terminal are used to connect to a power receiving device. The first output terminal is connected to the buck module through the third switch module, the second output terminal is connected to the buck module through the fourth switch module, the input terminal is connected to the first output terminal through the first switch module, and the input terminal is connected to the second output terminal through the second switch module. The method includes:

[0015] When a voltage greater than 5V is being output to the first power receiving device through the first switch module and a voltage greater than 5V is being output to the second power receiving device through the second switch module, the controller detects the required voltage requested by the second power receiving device, and the required voltage is lower than the currently output voltage;

[0016] The controller controls the buck module to raise the voltage to be the same as the currently output voltage;

[0017] The controller controls the fourth switch module to turn on, so as to output a voltage consistent with the current to the second power receiving device through the fourth switch module;

[0018] The controller controls the second switch module to turn off, so as to disconnect the voltage output to the second power receiving device through the second switch module;

[0019] The controller controls the buck module to reduce the voltage to the required voltage, so as to output the required voltage to the second power receiving device through the fourth switch module.

[0020] Optionally, the first switch module, the second switch module, the third switch module, and the fourth switch module are MOSFET switch modules, or are composed of PMOS, or are composed of NMOS.

[0021] Optionally, any one of the first switch module, the second switch module, the third switch module, and the fourth switch module is composed of a single PMOS or a dual PMOS.

[0022] Optionally, the buck module includes: a BUCK buck chip, a first capacitor, a second capacitor, and an inductor.

[0023] A third aspect of the present application provides a voltage switching device for charging control, and the device includes:

[0024] A processor, a memory, an input / output unit, and a bus;

[0025] The processor is connected to the memory, the input / output unit, and the bus;

[0026] The memory stores a program, and the processor calls the program to execute the method according to the first aspect and any optional method in the first aspect.

[0027] A fourth aspect of the present application provides a computer-readable storage medium, and a program is stored on the computer-readable storage medium, and when the program is executed on a computer, it executes the method according to the first aspect and any optional method in the first aspect.

[0028] It can be seen from the above technical solutions that the present application has the following advantages:

[0029] In the method provided by this application, when the charging device is charging, when there is only one device output and the input voltage is greater than 5V, when the second device is inserted, first control the buck module to increase the voltage to the required voltage, then control the second switch module to turn on, and then turn off the fourth switch module, so that there will be no sudden change in voltage during the voltage switching process, improving the smoothness of voltage switching and the stability of charging. Or, when the first power receiving device and the second power receiving device are both charging at a voltage greater than 5V and the same voltage level, if one of the power receiving devices requests a lower required voltage, then the controller first adjusts the voltage through the buck module to the current output voltage level, then turns on the fourth switch module, and then turns off the second switch module, and then the controller reduces the voltage through the buck module to the device required voltage, so that there will be no sudden change in voltage during the voltage switching process, improving the smoothness of voltage switching and the stability of charging. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in this application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of this application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0031] Figure 1 It is a schematic flowchart of an embodiment of the voltage switching method for charging control provided in this application;

[0032] Figure 2 It is a schematic structural diagram of the charging circuit involved in this application;

[0033] Figure 3 It is a schematic flowchart of another embodiment of the voltage switching method for charging control provided in this application;

[0034] Figure 4 It is a schematic structural diagram of an embodiment of the voltage switching device for charging control provided in this application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0035] Based on this, this application provides a voltage switching method for charging control, which improves the smoothness of voltage switching and the stability of charging.

[0036] The method provided by this application is used to control the charging circuit. Please refer to Figure 2, the charging circuit is provided with mutually coupled: a first switch module Q1, a second switch module Q2, a third switch module Q3, a fourth switch module Q4, a buck module B1, a controller U2, an input terminal V1, a first output terminal V2, and a second output terminal V3. The input terminal V1 is used to connect to a power supply, and the first output terminal V2 and the second output terminal V3 are used to connect to a power-receiving device. The first output terminal V2 is connected to the buck module B1 through the third switch module Q3, and the second output terminal V3 is connected to the buck module B1 through the fourth switch module Q4. The input terminal V1 is connected to the first output terminal V2 through the first switch module Q1, and the input terminal V1 is connected to the second output terminal V3 through the second switch module Q2.

[0037] Among them, the input terminal V1 is a power supply or a power module controllable by the controller U2, which can be a DC-DC input or an AC-DC input. The first output terminal V2 and the second output terminal are for output of V3. When the power-receiving device needs to be charged with a certain voltage and current, the controller controls the opening and closing of the four switch modules, namely the first switch module Q1, the second switch module Q2, the third switch module Q3, and the fourth switch module Q4, so as to supply the voltage required by the device. Specifically, the controller can be an IC or an IC group (a module composed of multiple chips). In the buck module, a BUCK buck chip, a capacitor, and an inductor can be provided. Among them, the BUCK buck chip can control the voltage at the input terminal, and obtain the variable required voltage through a protocol or feedback; and control the corresponding switch module, so that the voltage at the input terminal can be directly conducted to the first output terminal V2 and the second output terminal V3, or the voltage can be conducted to the first output terminal V2 and the second output terminal V3 through the buck module B1; and can detect the insertion and removal of the power-receiving device, perform protocol interaction with the power-receiving device, and obtain information such as the voltage, current, and power required by the power-receiving device; and can control the buck module B1 to step down the voltage, and step down the voltage of the input terminal V1 to a lower required voltage according to the demand.

[0038] Refer to Figure 2 , the buck module includes: a first capacitor C1, which has a filtering and voltage stabilizing function, a BUCK buck chip U1, an inductor L1, a second capacitor C2, which has a filtering and voltage stabilizing function. The first capacitor C1, the BUCK buck chip U1, the inductor L1, and the second capacitor C2 are combined into a BUCK buck circuit to step down the voltage of the input terminal V1 and convert it into the required voltage. The output terminal of the BUCK buck circuit is defined as the buck output terminal V4.

[0039] Among them, the first switch module Q1, the second switch module Q2, the third switch module Q3, and the fourth switch module Q4 are MOSFET switch modules, or are composed of PMOS, or are composed of NMOS. Figure 2In the illustrated embodiment, the first switch module Q1 and the second switch module Q2 are single PMOSs, the third switch module Q3 and the fourth switch module Q4 are composed of two PMOSs. When the first switch module Q1 or the second switch module Q2 is turned off, it can prevent the voltage of the input terminal V1 from being directly introduced into the first output terminal V2 or the second output terminal V3. When the first switch module Q1 or the second switch module Q2 is turned on, the voltage of the input terminal V1 is directly introduced into the first output terminal V2 or the second output terminal V3. When the third switch module Q3 or the fourth switch module Q4 is turned off, it can prevent the buck output terminal V4 from introducing voltage into the first output terminal V2 or the second output terminal V3. When the third switch module Q3 or the fourth switch module Q4 is turned on, the buck output terminal V4 introduces voltage into the first output terminal V2 or the second output terminal V3. In practice, the first output terminal V2 and the second output terminal V3 can be charging interfaces such as Type-C, Micro usb, lighting, etc.

[0040] The method provided in the present application will be described below:

[0041] Please refer to Figure 1 , Figure 1 which is a schematic flowchart of an embodiment of the voltage switching method in the charging control provided by the present application. The method includes:

[0042] 101. When the voltage is being output to the first power receiving device through the first switch module and the output voltage is greater than 5V, the controller detects the insertion of the second power receiving device;

[0043] The method provided by the present application is used in the above charging circuit. Among them, the BUCK buck chip U1, the first capacitor C1, the second capacitor C2, and the inductor L1 form a BUCK buck circuit to convert the voltage of the input terminal V1 into the voltage of the buck output terminal V4. The voltage of the buck output terminal V4 is controlled by the controller U2. The controller U2 can be a controller module composed of multiple chips. The voltage of the input terminal V1 or the buck output terminal V4 affects the voltage of the first output terminal V2 and the second output terminal V3. When all four switch modules are not conducting, the second output terminals V3 and V3 are equal to 0V. If the first switch module Q1 and the second switch module Q2 are conducting and the third switch module Q3 and the fourth switch module Q4 are turned off, the voltage values of the input terminal V1, the first output terminal V2, and the second output terminal V3 are equivalent. If the third switch module Q3 and the fourth switch module Q4 are conducting and the first switch module Q1 and the second switch module Q2 are turned off, the voltage values of the buck output terminal V4, the first output terminal V2, and the second output terminal V3 are equivalent.

[0044] In this application, first, either the first switch module Q1 or the second switch module Q2 is turned on to charge a power receiving device, and the charging voltage is greater than 5V. In this application, it is not limited specifically whether the power receiving device is charged through the first switch module Q1 or the second switch module Q2. In practice, both the first switch module Q1 and the second switch module Q2 directly input voltage through the input terminal V1. Therefore, this application takes the first switch module Q1 as an example for illustration.

[0045] The voltage greater than 5V described in this application can be 9V, 12V, 15V, 20V, 28V, 36V, 48V, etc.

[0046] 102. The controller controls the fourth switch module to turn on, so as to output a 5V voltage to the second power receiving device;

[0047] When charging a power receiving device, if the controller U2 detects another power receiving device, that is, the second power receiving device is inserted, the controller U2 first controls the fourth switch module Q4 to turn on, so that the input terminal V1 outputs a 5V voltage to the second power receiving device through the BUCK buck - down circuit and the fourth switch module Q4.

[0048] 103. If the required voltage requested by the second power receiving device is the same as the voltage output to the first power receiving device, the controller controls the buck - down module to raise the voltage to the required voltage;

[0049] After outputting a 5V voltage to the second power receiving device, if the second power receiving device requests a higher voltage and the requested voltage is the same as the charging voltage of the first power receiving device, then the controller first controls the buck - down module B1 to raise the voltage to the required voltage of the second power receiving device, that is, to make the voltage at the buck - down output terminal V4 the same as the voltage at V2.

[0050] 104. The controller controls the second switch module to turn on, so as to output the required voltage to the second power receiving device through the second switch module;

[0051] 105. The controller controls the fourth switch module to turn off, so as to disconnect the required voltage output to the second power receiving device.

[0052] When the voltage of the buck output terminal V4 is increased to be the same as the voltage of the first output terminal V2, the controller controls the second switch module Q2 to turn on, so that the input terminal V1 directly outputs the required voltage that is the same as the second output terminal V2 to the second output terminal V3. Then the controller controls the fourth switch module Q4 to turn off, so as to disconnect the voltage output from the buck output terminal V4 to the second output terminal V3. In practice, there are coupling capacitors on the VBUS power supply pins and signal lines of the second output terminal and the third output terminal. If the VBUS changes suddenly, a large current will pass through the signal line, eventually causing the signal line to be interfered, resulting in device communication failure or even charging interruption. If the voltage is switched directly through the MOS switch during voltage switching, a large current will pass through.

[0053] The following is an example description of the above embodiment:

[0054] First, the power receiving device connected to the first output terminal V2 is charging at 20V. At this time, the first switch module Q1 is turned on, and the other three switch modules are turned off. When another power receiving device is inserted into the second output terminal V3, first turn on the fourth switch module to allow the buck output terminal V4 to output 5V voltage to the second output terminal. At this time, if the power receiving device at the second output terminal V3 requests 20V voltage for charging, the controller U2 controls the BUCK buck circuit to boost the voltage of the buck output terminal V4 from 5V to 20V, and then turn on the second switch module Q2 and turn off the fourth switch module Q4 to complete the whole process.

[0055] In this embodiment, the example of the first output terminal V2 charging first and then detecting that a second power receiving device is inserted into the second output terminal is used for illustration. When the second output terminal V3 charges first and then detects that a second power receiving device is inserted into the first output terminal V2, the principle and control process are similar to the above method and will not be elaborated here.

[0056] Another voltage switching method in the charging control is also provided in this application. This method is used to control the charging circuit when one of the output ports is switched to a lower voltage during charging with the same voltage. The following is a detailed description of this method:

[0057] Please refer to Figure 3 , Figure 3 which is a schematic flowchart of another embodiment of the voltage switching method for charging control provided by this application. This embodiment includes:

[0058] 301. When the voltage greater than 5V is being output to the first power receiving device through the first switch module and the voltage greater than 5V is being output to the second power receiving device through the second switch module, the controller detects the required voltage requested by the second power receiving device, and the required voltage is lower than the currently output voltage;

[0059] The method provided by this application is used in the above charging circuit. Among them, the BUCK step-down chip U1, the first capacitor C1, the second capacitor C2, and the inductor L1 form a BUCK step-down circuit, which converts the voltage of the input terminal V1 into the voltage of the step-down output terminal V4. The voltage of the step-down output terminal V4 is controlled by the controller U2. The controller U2 can be a controller module composed of multiple chips. The voltage of the input terminal V1 or the step-down output terminal V4 affects the voltages of the first output terminal V2 and the second output terminal V3. When all four switch modules are not conducting, the second output terminals V3 and V3 are equal to 0V. If the first switch module Q1 and the second switch module Q2 are conducting and the third switch module Q3 and the fourth switch module Q4 are closed, the voltages of the input terminal V1, the first output terminal V2, and the second output terminal V3 are equivalent. If the third switch module Q3 and the fourth switch module Q4 are conducting and the first switch module Q1 and the second switch module Q2 are closed, the voltages of the step-down output terminal V4, the first output terminal V2, and the second output terminal V3 are equivalent.

[0060] In the method provided by this embodiment, first, the first output terminal V2 and the second output terminal V3 in the charging circuit respectively output voltages to two power receiving devices, and the output voltages are both greater than 5V. That is, at this time, the first switch module Q1 and the second switch module Q2 are conducting, and the third switch module Q3 and the fourth switch module Q4 are closed.

[0061] 302. The controller controls the step-down module to raise the voltage to be consistent with the currently output voltage;

[0062] During the charging process, if one of the power receiving devices requests a lower charging voltage, for example, the second power receiving device requests a required voltage lower than the current charging voltage, then the controller U2 controls the step-down module B1 to raise the voltage of the step-down output terminal V4 to be consistent with the currently output voltage, that is, the voltage of the step-down output terminal V4 is consistent with the voltages of the first output terminal V2 and the second output terminal V3.

[0063] 303. The controller controls the fourth switch module to turn on, so as to output a voltage consistent with the current one to the second power receiving device through the fourth switch module;

[0064] After the voltage of the step-down output terminal V4 is raised to be consistent with the voltages of the first output terminal V2 and the second output terminal V3, the controller U2 controls the fourth switch module Q4 to conduct, that is, to output a voltage from the step-down output terminal V4 to the second output terminal V3.

[0065] 304. The controller controls the second switch module to turn off, so as to disconnect the voltage output to the second power receiving device through the second switch module;

[0066] The controller U2 then controls the second switch module Q2 to turn off, thereby disconnecting the direct connection between the input terminal V1 and the second output terminal V3. At this time, the voltage is output to the second output terminal V3 through the buck output terminal V4.

[0067] 305. The controller controls the buck module to reduce the voltage to the required voltage, so as to output the required voltage to the second power receiving device through the fourth switch module.

[0068] The controller U2 then controls the buck module B1 to reduce the voltage of the buck output terminal V4 to the required voltage requested by the second power receiving device, that is, to output a lower required voltage to the second output terminal V3 through the buck output terminal V4.

[0069] The following is illustrated by examples:

[0070] The power receiving devices connected to the first output terminal V2 and the second output terminal V3 are both charging at 20V. At this time, the first switch module Q1 and the second switch module Q2 are turned on, and the third switch module Q3 and the fourth switch module Q4 are turned off. If the power receiving device connected to the second output terminal V3 requests a 5V output voltage, the controller U2 controls the voltage of the buck output terminal V4 to boost from 5V to 20V, then turns on the fourth switch module Q4, and then turns off the second switch module Q2. The controller U2 controls the voltage of the buck output terminal V4 to reduce from 20V to 5V again, thereby completing the voltage switching process.

[0071] In the method provided by this application, when the charging device is charging, when only one device outputs and the input voltage is greater than 5V, when the second device is inserted, first control the buck module B1 to raise the voltage to the required voltage, then control the second switch module Q2 to turn on, and then turn off the fourth switch module Q4, so that there is no sudden change in voltage during the voltage switching process, improving the smoothness of voltage switching and the stability of charging. Or, when both the first power receiving device and the second power receiving device are charging at a voltage greater than 5V, if one of the power receiving devices requests a lower required voltage, then the controller U2 first steps down through the buck module B1, then turns on the fourth switch module Q4, and then turns off the second switch module Q2, so that there is no sudden change in voltage during the voltage switching process, improving the smoothness of voltage switching and the stability of charging.

[0072] In this embodiment, taking the example that the second power receiving device connected to the second output terminal V3 requests a lower required voltage for illustration, obviously, this method is also applicable to the case where the first power receiving device requests a lower required voltage. The essential principle between the two is the same. This application does not make a limitation in this regard, and this case also belongs to the protection scope required by this application.

[0073] This application also provides a voltage switching device for charging control, including:

[0074] Processor 401, memory 402, input / output unit 403, and bus 404;

[0075] Processor 401 is connected to memory 402, input / output unit 403, and bus 404;

[0076] Memory 402 stores a program, and processor 401 calls the program to execute any of the voltage switching methods for charging control described above.

[0077] This application also relates to a computer-readable storage medium on which a program is stored. It is characterized in that when the program runs on a computer, the computer is enabled to execute any of the voltage switching methods for charging control described above.

[0078] Those skilled in the art can clearly understand that for the convenience and brevity of description, the specific working processes of the systems, devices, and units described above can refer to the corresponding processes in the foregoing method embodiments and will not be elaborated herein.

[0079] In several embodiments provided by this application, it should be understood that the disclosed systems, devices, and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the units is only a logical function division, and there can be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed couplings or direct couplings or communication connections to each other can be through some interfaces, and the indirect couplings or communication connections of the devices or units can be in electrical, mechanical, or other forms.

[0080] The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they can be located in one place or distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0081] In addition, in each embodiment of this application, the functional units can be integrated into one processing unit, or each unit can exist physically alone, or two or more units can be integrated into one unit. The above integrated units can be implemented in the form of hardware or in the form of software functional units.

[0082] When the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of this technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The foregoing storage medium includes: various media that can store program codes, such as USB flash drives, mobile hard disks, read-only memories (ROM, read-only memory), random access memories (RAM, random access memory), magnetic disks, or optical discs.

Claims

1. A voltage switching method for charging control, characterized in that The method is applied to a charging circuit, which is provided with mutually coupled: a first switch module, a second switch module, a third switch module, a fourth switch module, a buck module, a controller, an input terminal, a first output terminal, and a second output terminal. The input terminal is used to connect to a power supply, and the first output terminal and the second output terminal are used to connect to a power receiving device. The first output terminal is connected to the buck module through the third switch module, and the second output terminal is connected to the buck module through the fourth switch module. The input terminal is connected to the first output terminal through the first switch module, and the input terminal is connected to the second output terminal through the second switch module. The method includes: When the voltage is being output to a first power receiving device through the first switch module and the output voltage is greater than 5V, the controller detects that a second power receiving device is inserted; The controller controls the fourth switch module to conduct, so as to output a 5V voltage to the second power receiving device; If the required voltage requested by the second power receiving device is the same as the voltage output to the first power receiving device, the controller controls the buck module to raise the voltage to the required voltage; The controller controls the second switch module to turn on, so as to output the required voltage to the second power receiving device through the second switch module; The controller controls the fourth switch module to turn off, so as to disconnect the required voltage output to the second power receiving device.

2. The voltage switching method for charging control according to claim 1, wherein The first switch module, the second switch module, the third switch module, and the fourth switch module are MOSFET switch modules, or are composed of PMOS, or are composed of NMOS.

3. The voltage switching method for charging control according to claim 1, wherein The required voltage is 9V, 12V, 15V, 20V, 28V, 36V, or 48V.

4. The voltage switching method for charging control according to claim 1, characterized in that The buck module includes: a BUCK buck chip, a first capacitor, a second capacitor, and an inductor.

5. A voltage switching method for charging control, characterized in that, The method is applied to a charging circuit, which is provided with mutually coupled: a first switch module, a second switch module, a third switch module, a fourth switch module, a buck module, a controller, an input terminal, a first output terminal, and a second output terminal. The input terminal is used to connect to a power supply, and the first output terminal and the second output terminal are used to connect to a power receiving device. The first output terminal is connected to the buck module through the third switch module, and the second output terminal is connected to the buck module through the fourth switch module. The input terminal is connected to the first output terminal through the first switch module, and the input terminal is connected to the second output terminal through the second switch module. The method includes: When the voltage greater than 5V is being output to a first power receiving device through the first switch module and the voltage greater than 5V is being output to a second power receiving device through the second switch module, the controller detects the required voltage requested by the second power receiving device, and the required voltage is lower than the currently output voltage; The controller controls the buck module to raise the voltage to be the same as the currently output voltage; The controller controls the fourth switch module to turn on, so as to output a voltage consistent with the current to the second power receiving device through the fourth switch module; The controller controls the second switch module to turn off, so as to disconnect the voltage output to the second power receiving device through the second switch module; The controller controls the buck module to reduce the voltage to the required voltage, so as to output the required voltage to the second power receiving device through the fourth switch module.

6. The voltage switching method for charging control according to claim 5, characterized in that The first switch module, the second switch module, the third switch module, and the fourth switch module are MOSFET switch modules, or are composed of PMOS, or are composed of NMOS.

7. The voltage switching method for charging control according to claim 6, characterized in that When any one of the first switch module, the second switch module, the third switch module, and the fourth switch module is composed of a single PMOS or a dual PMOS.

8. The voltage switching method for charging control according to claim 5, characterized in that The buck module includes: a BUCK buck chip, a first capacitor, a second capacitor, and an inductor.

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