Output voltage regulation circuit and method and power supply equipment

Abstract

The invention provides an output voltage regulation circuit and method and power supply equipment, and belongs to the technical field of power supply regulation, and the output voltage regulation method comprises a power supply chip, a controller, a voltage follower, a voltage division module and a controller. The power supply chip comprises a power supply input end, a feedback end used for providing reference voltage and a power supply output end used for providing output voltage. The controller is used for outputting a voltage control signal; the voltage follower is used for transmitting a voltage control signal. The voltage dividing module divides the voltage control signal, the output voltage and the reference voltage so as to establish a linear mapping relation between the output voltage and the voltage control signal; the controller adjusts the voltage control signal based on the linear mapping relationship to adjust the output voltage. Therefore, the adjustment of the output voltage output by the power supply chip can be realized by adjusting the voltage control signal, and the adjustment amplitude of the output voltage follows the constraint of the linear mapping relation, so that the adjustment of the output voltage is more accurate.

Description

Technical Field

[0001] This application relates to the technical field of power regulation, and specifically relates to an output voltage regulation circuit, method, and power supply device. Background Art

[0002] Power supply devices are mainly used to convert the input voltage into a stable and adjustable output voltage to meet the needs of different loads. Power chips in power supply devices (such as buck chips, boost chips, etc.) can achieve precise regulation of the output voltage through the internal feedback control loop. Specifically, the output voltage can be sampled through the feedback pin of the power chip and compared with the reference voltage inside the power chip, thereby dynamically adjusting the switching duty cycle to ensure the stability of the output voltage.

[0003] Currently, in order to adjust the output voltage of the power chip to meet different power consumption requirements, a potentiometer is usually set between the output pin and the feedback pin of the power chip, and the output voltage of the power chip is adjusted by adjusting the resistance value of the potentiometer. However, the relationship between the output voltage of the power chip and the resistance value of the potentiometer is non-linear, making it difficult to accurately control the change amount of the output voltage when the potentiometer is adjusted by the same angle. Therefore, how to improve the precise adjustment of the output voltage of the power chip is an urgent problem to be solved currently. Summary of the Invention

[0004] In view of the deficiencies in the prior art, this application provides an output voltage regulation circuit, method, and power supply device.

[0005] In a first aspect, an output voltage regulation circuit provided by this application includes:

[0006] A power chip, including a power input terminal, a feedback terminal for providing a reference voltage, and a power output terminal for providing an output voltage;

[0007] A controller for outputting a voltage control signal;

[0008] A voltage follower connected to the controller for transmitting the voltage control signal;

[0009] A voltage division module connected to the voltage follower, the power output terminal, and the feedback terminal, which divides the voltage control signal, the output voltage, and the reference voltage to establish a linear mapping relationship between the output voltage and the voltage control signal;

[0010] Wherein, the controller adjusts the voltage control signal based on the linear mapping relationship to regulate the output voltage.

[0011] Optionally, the voltage follower includes a first input terminal connected to the controller, an output terminal connected to the voltage division module, and a second input terminal.

[0012] Optionally, the voltage division module includes a first resistor, a second resistor, and a third resistor;

[0013] A first end of the first resistor is connected to a power output terminal of the power supply chip, and a second end is connected to a feedback terminal of the power supply chip and a first end of the second resistor at a voltage division node;

[0014] A second end of the second resistor is grounded;

[0015] A first end of the third resistor is connected to the voltage division node, and a second end is connected to an output terminal of the voltage follower;

[0016] Wherein, the linear mapping relationship is set according to the reference voltage and the resistance values of the first resistor, the second resistor, and the third resistor.

[0017] Optionally, it further includes a current acquisition module; the current acquisition module includes a current acquisition chip and an operational amplifier;

[0018] An input terminal of the current acquisition chip is connected to a power output terminal of the power supply chip;

[0019] A first input terminal of the operational amplifier is connected to an output terminal of the current acquisition chip, and a second input terminal and an output terminal are connected to the controller, and are used to generate a current sampling signal according to the output voltage;

[0020] The controller is further configured to adjust the voltage control signal according to the current sampling signal to adjust the output voltage.

[0021] According to a second aspect of the present application, there is provided an output voltage adjustment method, based on the above output voltage adjustment circuit, the method is applied to the controller, and the method includes:

[0022] Obtain a set target voltage value;

[0023] Obtain the linear mapping relationship between the output voltage formed by the voltage division module and the voltage control signal;

[0024] According to the linear mapping relationship, determine the voltage control signal corresponding to the target voltage value, and output the voltage control signal to the voltage follower to adjust the voltage division ratio of the voltage division module, so that the power supply chip adjusts the output output voltage to the target voltage value.

[0025] Optionally, the linear mapping relationship is negatively correlated. As the amplitude of the voltage control signal increases, the output voltage value gradually decreases.

[0026] Optionally, the linear mapping relationship is VOUT = -VDAC*R10 / R30 + VFB*(R10 / R20 + R10 / R30 + 1);

[0027] wherein, R10 is the resistance value of the first resistor, R20 is the resistance value of the second resistor, R30 is the resistance value of the third resistor, VOUT is the output voltage, VFB is the reference voltage, and VDAC is the amplitude of the voltage control signal.

[0028] Optionally, it further includes:

[0029] Obtain a set current limit value;

[0030] Obtain the output current sampling signal of the power supply chip;

[0031] When the current sampling signal is greater than or equal to the current limit value, adjust the voltage control signal to reduce the output voltage of the power supply chip.

[0032] Optionally, it further includes:

[0033] Output an enable signal to the power supply chip to control the power supply chip to conduct, so that the power supply chip outputs an output voltage with an amplitude of the target voltage value.

[0034] In a third aspect, in an embodiment, the present application provides a power supply device, including the output voltage regulation circuit as described above;

[0035] Or, it includes a memory and a processor; the memory stores a computer program, and the processor is used to run the computer program in the memory to execute the steps in the above-mentioned output voltage regulation method.

[0036] In a fourth aspect, in an embodiment, the present application provides a storage medium, and the storage medium stores a computer program, and the computer program is loaded by a processor to execute the steps in the output voltage regulation method in any of the above embodiments.

[0037] In summary, in the present application, first, the controller can dynamically adjust the voltage control signal based on the linear mapping relationship. Subsequently, the voltage division module performs voltage division processing on the voltage control signal, the output voltage, and the reference voltage. When the voltage control signal is adjusted, the voltage division ratio of the voltage division module changes accordingly, and the voltage division module is directly connected to the feedback terminal of the power supply chip. Therefore, by adjusting the voltage control signal, the adjustment of the output voltage output by the power supply chip can be achieved, and the adjustment range of the output voltage follows the constraint of the linear mapping relationship, thereby making the adjustment of the output voltage more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] To more clearly illustrate the technical solutions in the embodiments of the present 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 the present application. For those skilled in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0039] Figure 1 Schematic diagram of a power supply voltage adjustment circuit in an embodiment of the present application;

[0040] Figure 2 Circuit connection diagram of a power supply voltage adjustment circuit in an embodiment of the present application;

[0041] Figure 3 Schematic diagram of a linear mapping relationship in an embodiment of the present application;

[0042] Figure 4 Circuit connection diagram of a current acquisition module in an embodiment of the present application;

[0043] Figure 5 Flowchart of a power supply voltage adjustment method in an embodiment of the present application;

[0044] Figure 6 Schematic diagram of a power supply device in an embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0045] The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, rather than all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present application.

[0046] In the description of the present application, it should be understood that the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the described features. In the description of the present application, "a plurality" means two or more, unless otherwise specifically defined. In the present application, the term "exemplary" is used to mean "serving as an example, illustration, or explanation". Any embodiment described as "exemplary" in the present application is not necessarily to be construed as more preferred or advantageous than other embodiments. In order for any person skilled in the art to implement and use the present application, the following description is provided. In the following description, details are set forth for purposes of explanation. It should be understood that those of ordinary skill in the art can recognize that the present application can be implemented without the use of these specific details. In other instances, well-known structures and processes are not elaborated in detail to avoid obscuring the description of the present application with unnecessary details. Therefore, the present application is not intended to be limited to the embodiments shown, but is to be accorded the widest scope consistent with the principles and features disclosed in the present application.

[0047] In a first aspect, as Figure 1 shown, in one embodiment, the present application provides an output voltage regulation circuit. The output voltage regulation circuit includes a power supply chip U1, a controller 2, a voltage follower U2, a voltage division module 1, and the controller 2. Among them, the power supply chip U1 includes a power input terminal, a feedback terminal for providing a reference voltage, and a power output terminal for outputting an output voltage. The controller 2 is configured to output a voltage control signal; the voltage follower U2 is connected to the controller 2 and is configured to transmit the voltage control signal. The voltage division module 1 is connected to the voltage follower U2, the power output terminal, and the feedback terminal, and divides the voltage control signal, the output voltage, and the reference voltage to establish a linear mapping relationship between the output voltage and the voltage control signal; wherein, the controller 2 adjusts the voltage control signal based on the linear mapping relationship to regulate the output voltage.

[0048] As an example, the target voltage value of the output voltage can be set by the controller 2, and the linear mapping relationship is stored in the controller 2 so that the controller 2 can substitute the target voltage value into the linear mapping relationship to obtain a voltage control signal corresponding to the target voltage value.

[0049] As an example, the magnitude of the reference voltage is related to the model of the power supply chip U1, and the reference voltages of different power supply chips U1 are different. For example, the reference voltage can be 0.8v or 1.2v.

[0050] In the above embodiments, first, the controller 2 can dynamically adjust the voltage control signal based on a linear mapping relationship. Subsequently, the voltage division module 1 performs voltage division processing on the voltage control signal, the output voltage, and the reference voltage. When the voltage control signal is adjusted, the voltage division ratio of the voltage division module 1 changes accordingly, and the voltage division module 1 is directly connected to the feedback terminal of the power supply chip U1. Therefore, by adjusting the voltage control signal, the adjustment of the output voltage output by the power supply chip U1 can be achieved, and the adjustment range of the output voltage follows the constraint of the linear mapping relationship, thereby making the adjustment of the output voltage more accurate.

[0051] Referring to Figure 2 , as an embodiment of the voltage follower U2, the voltage follower U2 includes a first input terminal connected to the controller 2, an output terminal connected to the voltage division module 1, and a second input terminal.

[0052] As an example, the first input terminal of the voltage follower U2 can be the non-inverting input terminal, and the second input terminal can be the inverting input terminal. A feedback resistor is also connected in series between the second input terminal and the output terminal of the voltage follower U2 to adjust the gain of the voltage follower U2 to 1, thereby reducing the output impedance.

[0053] Referring to Figure 2 , as an embodiment of the voltage division module 1, the voltage division module 1 includes a first resistor R1, a second resistor R2, and a third resistor R3; the first end of the first resistor R1 is connected to the power output terminal of the power supply chip U1, and the second end is connected to the feedback terminal of the power supply chip U1 and the first end of the second resistor R2 at a voltage division node. The second end of the second resistor R2 is grounded; the first end of the third resistor R3 is connected to the voltage division node, and the second end is connected to the output terminal of the voltage follower U2; wherein, the linear mapping relationship is set according to the reference voltage, the resistance values of the first resistor R1, the second resistor R2, and the third resistor R3.

[0054] As an example, the voltage division node and the feedback terminal of the power supply chip U1 are equipotential points, and the potential of the output terminal of the voltage follower U2 is the same as that of its first input terminal. When the voltage control signal is greater than or equal to the reference voltage, the potential of the second terminal of the third resistor R3 is greater than that of its first terminal. Therefore, the conduction direction of the third resistor R3 is from the second terminal of the third resistor R3 to the first terminal. At this time, the shunt value of the second resistor R2 is equal to the sum of the shunt values of the first resistor R1 and the third resistor R3, that is, VFB / R20 = (VOUT - VFB) / R10 + (VDAC - VFB) / R30; where, R10 is the resistance value of the first resistor R1, R20 is the resistance value of the second resistor R2, R30 is the resistance value of the third resistor R3, VOUT is the output voltage, VFB is the amplitude of the reference voltage, and VDAC is the amplitude of the voltage control signal; VFB / R20 is the shunt value of the second resistor R2, (VOUT - VFB) / R10 is the shunt value of the first resistor R1, and (VDAC - VFB) / R30 is the shunt value of the third resistor R3. Rearranging the above formula, we can get: VOUT = (VFB * R10) / R20 - (VDAC - VFB) * R10 / R30 + VFB = -VDAC * R10 / R30 + VFB * (R10 / R20 + R10 / R30 + 1).

[0055] When the voltage control signal is less than the reference voltage, the potential of the second terminal of the third resistor R3 is less than that of its first terminal. Therefore, the conduction direction of the third resistor R3 is from the first terminal of the third resistor R3 to the second terminal, and the second terminal of the third resistor R3 is grounded through the inside of the voltage follower U2. At this time, the shunt value of the first resistor R1 is equal to the sum of the shunt values of the second resistor R2 and the third resistor R3, that is, (VOUT - VFB) / R10 = VFB / R20 + (VFB - VDAC) / R30; Rearranging the above formula, we can get: VOUT = (VFB * R10) / R20 + (VFB - VDAC) * R10 / R30 + VFB = -VDAC * R10 / R30 + VFB * (R10 / R20 + R10 / R30 + 1).

[0056] It can be seen from this that regardless of the magnitude relationship between the voltage control signal and the reference voltage, VOUT = -VDAC * R10 / R30 + VFB * (R10 / R20 + R10 / R30 + 1) is always satisfied. Combining Figure 3 , the slope of the linear mapping relationship between the output voltage and the voltage control signal is -R10 / R30, that is, it is negatively correlated with the ratio of the resistance value of the first resistor R1 to the resistance value of the third resistor R3. The translation range of the linear mapping relationship can be adjusted by the reference voltage, the resistance value of the first resistor R1, the resistance value of the second resistor R2, and the resistance value of the third resistor R3.

[0057] In the above embodiments, different reference voltages can be set by selecting different power supply chips U1. The resistance values of the first resistor R1, the second resistor R2, and the third resistor R3 can also be determined according to actual needs, so that the voltage division module 1 can flexibly establish a linear mapping relationship between the output voltage and the voltage control signal.

[0058] Referring to Figure 4 , as a further embodiment of the power supply voltage adjustment circuit, the power supply voltage adjustment circuit further includes a current acquisition module; the current acquisition module includes a current acquisition chip U3 and an operational amplifier U4. Among them, the input end of the current acquisition chip U3 (such as a Hall current sensor) is connected to the power output end of the power supply chip U1; the input end of the current acquisition chip U3 is connected to the power output end of the power supply chip U1; the first input end of the operational amplifier U4 is connected to the output end of the current acquisition chip U3, and the second input end and the output end are connected to the controller 2, and are used to generate a current sampling signal according to the output voltage; the controller 2 is also used to adjust the voltage control signal according to the current sampling signal to adjust the output voltage.

[0059] In the above embodiments, first, the current acquisition chip U3 acquires the current information of the output voltage and converts it into a current sampling signal, and then transmits it to the controller 2. Secondly, the controller 2 can judge whether the output voltage is in an overcurrent state according to the received current sampling signal. When the controller 2 detects that the output voltage is in an overcurrent state, the controller 2 can adjust the voltage control signal, so as to effectively adjust the output voltage and avoid the occurrence of overcurrent phenomena.

[0060] Referring to Figure 5 , secondly, in an embodiment, the present application provides an output voltage adjustment method. Based on the above power supply voltage adjustment circuit, the method is applied to the controller 2, and the method includes step S101-step S103, which will be introduced in detail below.

[0061] Step S101: Obtain the set target voltage value.

[0062] As an example, the target voltage value input externally can be received through the communication module of the controller 2 so that the user can set the target voltage value.

[0063] Step S102: Obtain the linear mapping relationship between the output voltage formed by the voltage division module 1 and the voltage control signal.

[0064] Step S103: According to the linear mapping relationship, determine the voltage control signal corresponding to the target voltage value, and output the voltage control signal to the voltage follower U2 to adjust the voltage division ratio of the voltage division module 1, so that the power supply chip U1 adjusts the output output voltage to the target voltage value.

[0065] In some embodiments, the linear mapping relationship is negatively correlated, and as the amplitude of the voltage control signal increases, the output voltage value gradually decreases.

[0066] In some embodiments, the linear mapping relationship is VOUT = -VDAC * R10 / R30 + VFB * (R10 / R20 + R10 / R30 + 1). Wherein, R10 is the resistance value of the first resistor R1, R20 is the resistance value of the second resistor R2, R30 is the resistance value of the third resistor R3, VOUT is the output voltage, VFB is the reference voltage, and VDAC is the amplitude of the voltage control signal.

[0067] Combined with Figure 3 , the amplitude of the voltage control signal can be adjusted between 0 and VFB * (R30 / R20 + R30 / R10 + 1), so that the output voltage varies between VFB * (R10 / R20 + R10 / R20 + 1) and 0. That is, when the amplitude of the voltage control signal is 0, the amplitude of the output voltage is maximally VFB * (R10 / R20 + R10 / R20 + 1), and when the amplitude of the voltage control signal is VFB * (R30 / R20 + R30 / R10 + 1), the amplitude of the output voltage is zero. In this way, linear regulation between the voltage control signal and the output voltage is achieved.

[0068] As an example, the linear mapping relationship can be stored in the controller 2. Since the reference voltage, the resistance values of the first resistor R1, the second resistor R2, and the third resistor R3 are known values, after setting the target voltage value, the controller 2 can directly substitute the target voltage value into the linear mapping relationship to obtain the voltage control signal.

[0069] As a further implementation manner of the power supply voltage regulation method, the power supply voltage regulation method further includes step S201 - step S203, which will be introduced in detail below.

[0070] Step S201: Obtain the set current limit value.

[0071] As an example, the current limit value can be set according to the actual application scenario. For example, the current limit value input externally can be received through the communication module of the controller 2 so that the user can set the current limit value.

[0072] Step S202: Obtain the current sampling signal of the voltage.

[0073] Step S203: When the current sampling signal is greater than or equal to the current limit value, adjust the voltage control signal to reduce the current value of the output voltage.

[0074] As an example, when the linear mapping relationship is negatively correlated and the current sampling signal is greater than or equal to the current limiting value, the output voltage current value can be reduced by increasing the voltage control signal.

[0075] As a further implementation of the power supply voltage regulation method, the power supply voltage regulation method further includes: outputting an enable signal to the power supply chip U1 to control the power supply chip U1 to conduct, so that the power supply chip U1 outputs an output voltage with an amplitude of the target voltage value.

[0076] In a third aspect, in one embodiment, the present application provides a power supply device including the output voltage regulation circuit as described above.

[0077] Or, it includes a memory and a processor. The memory stores a computer program, and the processor is used to run the computer program in the memory to execute the steps in the above-mentioned output voltage regulation method.

[0078] The power supply device may include a processor 401 with one or more processing cores, a memory 402 with one or more computer-readable storage media, a power supply 403, an input unit 404, and other components. Those skilled in the art can understand that Figure 6 the structure of the power supply device shown in does not limit the power supply device, and it may include more or fewer components than shown in the figure, or combine certain components, or have different component arrangements. Among them:

[0079] The processor 401 is the control center of the power supply device, connecting various parts of the entire power supply device through various interfaces and lines. By running or executing the software programs and / or modules stored in the memory 402, and calling the data stored in the memory 402, it executes various functions of the power supply device and processes data, thereby monitoring the power supply device as a whole. Optionally, the processor 401 may include one or more processing cores; preferably, the processor 401 may integrate an application processor and a modulation and demodulation processor. Among them, the application processor mainly processes the operating system, user interface, computer programs, etc., and the modulation and demodulation processor mainly processes wireless communication. It can be understood that the above-mentioned modulation and demodulation processor may not be integrated into the processor 401.

[0080] The memory 402 can be used to store software programs and modules. The processor 401 executes various functional applications and data processing by running the software programs and modules stored in the memory 402. The memory 402 mainly includes a program storage area and a data storage area. Among them, the program storage area can store an operating system, computer programs required for at least one function (such as a sound playback function, an image playback function, etc.); the data storage area can store data created according to the use of the server. In addition, the memory 402 can include high-speed random access memory and can also include non-volatile memory, such as at least one magnetic disk storage device, a flash memory device, or other volatile solid-state storage devices. Correspondingly, the memory 402 can also include a memory controller 2 to provide the processor 401 with access to the memory 402.

[0081] The power supply device further includes a power supply 403 for supplying power to each component. Preferably, the power supply 403 can be logically connected to the processor 401 through a power management system, so as to implement functions such as management of charging, discharging, and power consumption management through the power management system. The power supply 403 can also include any components such as one or more DC or AC power supplies, a recharge system, a power failure detection circuit, a power converter or inverter, and a power status indicator.

[0082] The power supply device may further include an input unit 404, which can be used to receive input digital or character information, and generate keyboard, mouse, joystick, optical or trackball signal inputs related to user settings and function controls.

[0083] Although not shown, the power supply device may further include a display unit, etc., which will not be elaborated here. Specifically, in this embodiment, when the power supply device is a model training power supply device, the processor 401 in the power supply device will load the executable files corresponding to the processes of one or more computer programs into the memory 402 according to the following instructions, and the processor 401 will run the computer programs stored in the memory 402 to execute the above steps.

[0084] Those of ordinary skill in the art can understand that all or part of the steps in any of the above methods can be completed by a computer program or by controlling relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium and loaded and executed by a processor.

[0085] In a fourth aspect, in an embodiment, the present application provides a storage medium, which stores multiple computer programs that can be loaded by a processor to execute the above steps.

[0086] Those of ordinary skill in the art can understand that any reference to a memory, storage, database, or other medium used in the embodiments provided in this application may include non-volatile and / or volatile memory. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memory may include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), Rambus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and Rambus dynamic RAM (RDRAM), etc.

[0087] Since the computer program stored in the storage medium can execute the steps in the output voltage regulation method in any of the embodiments provided in this application, the beneficial effects achievable by the output voltage regulation method in any of the embodiments provided in this application can be realized. For details, refer to the previous embodiments and will not be elaborated here.

[0088] The specific implementation of each of the above operations can be referred to the previous embodiments and will not be elaborated here.

[0089] In the above embodiments, the descriptions of the various embodiments have their respective emphases. For the parts not elaborated in a certain embodiment, reference can be made to the detailed descriptions of other embodiments above. Details will not be repeated here.

[0090] The above has introduced in detail an output voltage regulation circuit, method, and power supply device provided in this application. Specific examples are used in this text to elaborate on the principle and implementation manner of this application. The descriptions of the above embodiments are only used to help understand the method and its core idea of this application; at the same time, for those skilled in the art, based on the idea of this application, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to this application.

[0091] The technical features of the above embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as within the scope described in this specification.

Claims

1. An output voltage regulation circuit, characterized in that: include: A power chip, comprising a power input terminal, a feedback terminal for providing a reference voltage, and a power output terminal for providing an output voltage; A controller, for outputting a voltage control signal; A voltage follower, connected to the controller, and used for transmitting the voltage control signal; a voltage dividing module, connected to the voltage follower, the power supply output terminal and the feedback terminal, and dividing the voltage control signal, the output voltage and the reference voltage to establish a linear mapping relationship between the output voltage and the voltage control signal; Wherein, the controller adjusts the voltage control signal based on the linear mapping relationship to regulate the output voltage.

2. The output voltage regulation circuit according to claim 1, characterized in that: The voltage follower includes a first input terminal connected to the controller, an output terminal connected to the voltage divider module, and a second input terminal.

3. The output voltage regulation circuit according to claim 1, characterized in that: The voltage dividing module includes a first resistor, a second resistor and a third resistor; The first end of the first resistor is connected to the power output end of the power chip, and the second end is connected to the feedback end of the power chip and the first end of the second resistor to a voltage division node; The second end of the second resistor is grounded; The first end of the third resistor is connected to the voltage division node, and the second end is connected to the output end of the voltage follower. The linear mapping relationship is set according to the reference voltage, the resistance values ​​of the first resistor, the second resistor and the third resistor.

4. The output voltage regulation circuit according to claim 1, characterized in that: It also includes a current acquisition module; the current acquisition module includes a current acquisition chip and an operational amplifier; The input end of the current acquisition chip is connected to the power output end of the power chip; The first input terminal of the operational amplifier is connected to the output terminal of the current acquisition chip, and the second input terminal and the output terminal are connected to the controller, and are used to generate a current sampling signal according to the output voltage; The controller is further configured to adjust the voltage control signal according to the current sampling signal to regulate the output voltage.

5. An output voltage regulation method, characterized in that: Based on the output voltage adjustment circuit according to claim 3, the method is applied to the controller, and the method comprises: Get the set target voltage value; Acquire a linear mapping relationship between the output voltage formed by the voltage dividing module and the voltage control signal; According to the linear mapping relationship, a voltage control signal corresponding to the target voltage value is determined, and the voltage control signal is output to the voltage follower to adjust the voltage division ratio of the voltage division module so that the power chip adjusts the output voltage to the target voltage value.

6. The output voltage regulation method according to claim 5, characterized in that: The linear mapping relationship is negatively correlated.

7. The output voltage regulation method according to claim 6, characterized in that: The linear mapping relationship is VOUT=-VDAC*R10 / R30+VFB*(R10 / R20+R10 / R30+1); Among them, R10 is the resistance value of the first resistor, R20 is the resistance value of the second resistor, R30 is the resistance value of the third resistor, VOUT is the output voltage, VFB is the reference voltage, and VDAC is the amplitude of the voltage control signal.

8. The output voltage regulation method according to claim 7, characterized in that: Also includes: Get the set current limit value; Obtain the output current sampling signal of the power chip; When the current sampling signal is greater than or equal to the current limiting value, the voltage control signal is adjusted to reduce the output voltage of the power chip.

9. The output voltage regulation method according to claim 6, characterized in that: Also includes: An enable signal is output to the power chip to control the power chip to be turned on, so that the power chip outputs an output voltage with an amplitude of the target voltage value.

10. A power supply device, characterized in that: An output voltage regulating circuit comprising the output voltage regulating circuit according to any one of claims 1 to 5; Or, comprising a memory and a processor; the memory stores a computer program, and the processor is used to run the computer program in the memory to execute the steps in an output voltage regulation method as described in any one of claims 6 to 9.

Images