CN112787607B - Power supply circuit, power supply control method, electronic device and storage medium - Google Patents

Abstract

The invention relates to a power supply circuit, a power supply control method, an electronic device and a storage medium. The power supply circuit includes: a power module; the power amplifying module is used for receiving the audio signal and amplifying the audio signal; the switching module is used for switching and conducting a first power supply path or a second power supply path between the power supply module and the power amplification module, the first power supply path is used for outputting a first voltage to the power amplification module, the second power supply path is used for outputting a second voltage to the power amplification module, the first voltage is a power supply voltage directly output by the power supply module, and the second voltage is smaller than the first voltage; the control module is used for acquiring the power supply voltage of the power amplification module and controlling the switch module to conduct the first power supply path or the second power supply path according to the power supply voltage so as to output the target voltage for supplying power to the power amplification module; the target voltage is a voltage having a smaller voltage difference from the power supply voltage among the first voltage and the second voltage. The power supply voltage regulation efficiency of the power amplification module can be improved.

Description

Power supply circuit, power supply control method, electronic device and storage medium

Technical Field

The present invention relates to the technical field of electronic equipment, and in particular to a power supply circuit, a power supply control method, an electronic device and a storage medium.

Background technique

The audio power amplifier (PA) module is an important component of audio playback in electronic devices. The main function of the audio power amplifier module is to amplify the audio signal and then output it to the speaker to vibrate and make sound.

In current electronic devices, the audio PA unit is directly powered by the power supply voltage of the electronic device. In order to achieve the target voltage of the audio power amplifier module, the power supply voltage output by the power supply needs to be regulated, and the voltage regulation difference is large and the voltage regulation efficiency is low.

Summary of the invention

The embodiments of the present application provide a power supply circuit, a power supply control method, an electronic device and a storage medium, which can improve the power supply efficiency of an audio PA unit.

A power supply circuit, comprising:

Power module;

A power amplifier module, used for receiving an audio signal and amplifying the audio signal to output an amplified signal;

a switch module, connected to the power amplifier module and the power supply module respectively, and used for switching on a first power supply path or a second power supply path between the power supply module and the power amplifier module, wherein the first power supply path is used for outputting a first voltage to the power amplifier module, and the second power supply path is used for outputting a second voltage to the power amplifier module, wherein the first voltage is a power supply voltage directly output by the power supply module, and the second voltage is less than the first voltage;

A control module is connected to the power amplifier module and the switch module respectively, and is used to obtain the power supply voltage of the power amplifier module, and according to the supply voltage, control the switch module to turn on the first power supply path or the second power supply path to output a target voltage suitable for powering the power amplifier module; the target voltage is the voltage of the first voltage and the second voltage that has a smaller voltage difference with the supply voltage.

A power supply control method, comprising:

Obtaining a power supply voltage of a power amplifier module; the power amplifier module is used to amplify the audio signal;

According to the supply voltage, the switch module is controlled to switch on the first power supply path or the second power supply path between the power supply module and the power amplifier module, so as to output a target voltage suitable for supplying power to the power amplifier module; the target voltage is a voltage of the first voltage and the second voltage with a smaller voltage difference with the supply voltage;

The first power supply path is used to output a first voltage to the power amplifier module, and the second power supply path is used to output a second voltage to the power amplifier module; the first voltage is the power supply voltage directly output by the power supply module, and the second voltage is lower than the first voltage.

An electronic device, comprising:

loudspeakers; and

As in the power supply circuit mentioned above, the power amplifier module in the power supply circuit is connected to the speaker and is used to send an amplified signal to the speaker.

An electronic device comprises a power supply module, a power amplifier module, a memory and a processor, wherein the memory stores a computer program and the processor implements the steps of the above method when executing the computer program.

A computer-readable storage medium stores a computer program, which implements the steps of the above method when executed by a processor.

The above-mentioned power supply circuit, power supply control method, electronic device and storage medium are based on the fact that the power module in the electronic device will step down the voltage and then output the second voltage for powering each device when supplying power. The power supply circuit controls the switch module to switch the first power supply path or the second power supply path between the power module and the power amplifier module according to the power supply voltage of the power amplifier module, so as to output a target voltage suitable for powering the power amplifier module and having a smaller voltage difference with the supply voltage. When the power amplifier module is boosted, the voltage difference is smaller, so the power supply efficiency is higher.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

FIG1 is a structural block diagram of a power supply circuit in one embodiment;

FIG2 is a second structural block diagram of a power supply circuit in an embodiment;

FIG3 is a third structural block diagram of a power supply circuit in one embodiment;

FIG4 is a fourth structural block diagram of a power supply circuit in one embodiment;

FIG5 is a fifth structural block diagram of a power supply circuit in one embodiment;

FIG6 is a schematic diagram of an output waveform of a hysteresis comparator in one embodiment;

FIG7 is a sixth structural block diagram of a power supply circuit in one embodiment;

FIG8 is a schematic flow chart of a power supply control method in one embodiment;

FIG. 9 is a block diagram of a partial structure related to an electronic device provided in an embodiment of the present application.

Detailed ways

In order to facilitate the understanding of the present application, in order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application, and the preferred embodiments of the present application are given in the accompanying drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thoroughly understood. The present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. In the description of the present application, the meaning of "several" is at least one, such as one, two, etc., unless otherwise clearly and specifically defined.

It can be understood that the “connection” in the following embodiments should be understood as “electrical connection”, “communication connection”, etc. if the connected circuits, modules, units, etc. have electrical signals or data transmission between each other.

It should also be understood that the terms "include/comprise" or "have" etc. specify the existence of stated features, wholes, steps, operations, components, parts or combinations thereof, but do not exclude the possibility of the existence or addition of one or more other features, wholes, steps, operations, components, parts or combinations thereof. At the same time, the term "and/or" used in this specification includes any and all combinations of the relevant listed items.

The power supply circuit of one embodiment of the present application is applied to an electronic device. In one embodiment, the electronic device may include a mobile phone, a tablet computer, a laptop computer, an account computer, a mobile Internet device (Mobile Internet Device, MID), a wearable device (such as a smart watch, a smart bracelet, a pedometer, etc.) or other devices with audio playback function.

As shown in FIG1 , an embodiment of the present application provides a power supply circuit, which includes a power supply module 100, a power amplifier module 200, a switch module 300 and a control module 400. Among them, the power supply module 100 is a power supply module 100 in an electronic device, which is used to power other modules of the electronic device in addition to powering each component in the power supply circuit. The power amplifier module 200 is an audio power amplifier module 200, which is used to amplify the received audio signal and output the amplified signal to the speaker of the electronic device for playback. The switch module 300 is used to connect the first power supply path and the second power supply path between the power amplifier module 200 and the power supply module 100, and is used to switch the first power supply path or the second power supply path; when the first power supply path is turned on, the power supply module 100 outputs a first voltage Vbat to the power amplifier module 200 for power supply; when the second power supply path is turned on, the power supply module 100 outputs a second voltage Vph to the power amplifier module 200 for power supply, wherein the first voltage Vbat is the power supply voltage directly output by the power module 100, and the second voltage Vph is less than the first voltage Vbat. The control module 400 obtains the power supply voltage Vbst of the power amplifier module 200 in real time, and controls the switch module 300 to select the first power supply path or the second power supply path according to the power supply voltage Vbst, so as to output a target voltage suitable for powering the power amplifier module 200. The target voltage is a voltage with a smaller voltage difference with the power supply voltage Vbst between the first voltage Vbat and the second voltage Vph.

Based on the fact that the power module in the electronic device will step down the voltage when supplying power and then output the second voltage Vph for powering each device, the above-mentioned power supply circuit controls the switch module 300 to switch on the first power supply path or the second power supply path between the power module 100 and the power amplifier module 200 according to the power supply voltage Vbst of the power amplifier module 200, so as to output a target voltage suitable for powering the power amplifier module 200 with a smaller voltage difference with the power supply voltage Vbst. When the power amplifier module 200 is boosted, the voltage difference is smaller, so the power supply efficiency is higher.

As shown in Figure 5, in one embodiment, the power module 100 includes a battery cell 101 and a step-down unit 102. The battery cell 101 is connected to the switch module 300 and is used to output a first voltage Vbat; the step-down unit 102 is respectively connected to the battery cell 101 and the switch module 300, and is used to output a second voltage Vph after stepping down the first voltage Vbat output by the battery cell 101.

As shown in FIG2 , in one embodiment, the power amplifier module 200 includes a power amplifier 201, a boost unit 202 and a detection unit 203. The power amplifier 201 (amplifier, AP) is used to realize the process of amplifying and outputting the audio, and the boost unit 202 is used to boost the first voltage Vbat outputted by the power module 100 through the first power supply path or the second voltage Vph outputted through the second power supply path to the power supply voltage Vbst required by the power amplifier 201, so as to supply power to the power amplifier 201. The detection unit 203 is used to monitor the power supply voltage Vbst outputted by the boost unit 202 in real time, and output a feedback signal to the control unit based on the detected power supply voltage Vbst, and the control unit controls the switch module 300 according to the power supply voltage Vbst fed back by the feedback signal. Exemplarily, the electronic device may be a mobile phone with dual batteries connected in series, the first voltage Vbat output by the power module 100 is 7 to 8.8V, the first voltage Vbat is processed by the step-down unit 102 to output the second voltage Vph, the second voltage Vph may be 3.5 to 4.4V, when the power supply voltage Vbst of the power amplifier module 200 is 6 to 7V, the control module 400 controls the switch module 300 to turn on the second power supply path, turn off the first power supply path, output the second voltage Vph to the boost unit 202 of the power amplifier module 200 for boosting, the boost unit 202 outputs the boosted voltage to the power amplifier 201 for powering it; when the power supply voltage Vbst of the power amplifier module 200 is 7 to 10V, the control module 400 controls the switch module 300 to turn on the first power supply path, turn off the second power supply path, output the first voltage Vbat to the boost unit 202 of the power amplifier module 200 for boosting, the boost unit 202 outputs the boosted voltage to the power amplifier 201 for powering it.

In one of the embodiments, in order to ensure the playback quality of the audio signal, the power of the amplified signal will also change in real time. In order to meet the real-time changing power, the power supply voltage Vbst also needs to be adaptively adjusted. Therefore, the boost unit 202 needs to adjust the target value of the power supply voltage Vbst according to the audio signal, that is, adjust the voltage value to be achieved by the boost unit 202 to meet the needs of the power amplifier 201.

As shown in FIG3 , in one embodiment, the power amplifier module 200 further includes a protection unit 204. The protection unit 204 is used to detect the output of the power amplifier 201. When the output of the power amplifier 201 is detected to be abnormal (e.g., output stage damage, overvoltage, short circuit, etc.), the connection between the power amplifier 201 and the load is cut off to protect the power amplifier 201 and/or the load from damage. In one embodiment, the load may be a device such as a speaker or a microphone.

In one embodiment, the power amplification module 200 may be a smart power amplifier (Smart PA).

As shown in FIG4 , in one embodiment, the control module 400 includes a comparator 401 and a reference power supply 402. The comparator 401 is connected to the power amplifier module 200 and the switch module 300 respectively, and outputs a first control signal V1 or a second control signal V2 to the switch module 300 according to the power supply voltage Vbst of the power amplifier module 200 and the reference voltage Vref output by the reference power supply 402. The switch module 300 conducts the first power supply path when receiving the first control signal V1, and conducts the second power supply path when receiving the second control signal V2. Exemplarily, if the reference voltage Vref is 7V, when the power supply voltage Vbst is greater than 7V, the comparator 401 outputs the first control signal V1; when the power supply voltage Vbst is less than 7V, the comparator 401 outputs the second control signal V2.

In one embodiment, the comparator 401 includes a hysteresis comparator 401. The two input terminals of the hysteresis comparator 401 are respectively used to input a power supply voltage Vbst and a reference voltage Vref. As shown in FIG6 , when the power supply voltage Vbst is greater than the upper threshold voltage Vmax of the hysteresis comparator 401, the hysteresis comparator 401 outputs a first control signal V1; when the power supply voltage Vbst is less than the lower threshold voltage Vmin of the hysteresis comparator 401, the hysteresis comparator 401 outputs a second control signal V2; when the power supply voltage Vbst is between the upper threshold voltage Vmax and the lower threshold voltage Vmin, the original state is maintained, that is, if the original state of the hysteresis comparator 401 is to output the first control signal V1, it remains unchanged at this time. Among them, the upper threshold voltage Vmax of the hysteresis comparator 401 is greater than the reference voltage Vref output by the reference power supply 402, and the lower threshold voltage Vmin of the hysteresis comparator 401 is less than the reference voltage Vref output by the reference power supply 402. The hysteresis comparator 401 is used to implement the switching and conduction control of the switch module 300, which can ensure the stability of the system.

As shown in FIG. 7 , in one embodiment, the switch module 300 includes a first electronic switch Q1 and a second electronic switch Q2. The first end of the first electronic switch Q1 is connected to the battery unit 101, the second end of the first electronic switch Q1 is connected to the power supply end of the power amplifier module 200, and the controlled end of the first electronic switch Q1 is connected to the control module 400. When the first electronic switch Q1 is turned on, the power supply path (first power supply path) between the battery unit 101 and the power amplifier module 200 is turned on. The first end of the second electronic switch Q2 is connected to the output end of the step-down unit 102, the second end of the second electronic switch Q2 is connected to the power amplifier module 200, and the controlled end of the second electronic switch Q2 is connected to the control module 400. When the second electronic switch Q2 is turned on, the power supply path (second power supply path) between the battery unit 101 and the power amplifier module 200 via the step-down unit 102 is turned on.

In one embodiment, the first electronic switch Q1 and the second electronic switch Q2 may be MOS tubes. Specifically, the first electronic switch Q1 may be an NMOS tube, and the second electronic switch Q2 may be a PMOS tube. The first control signal V1 is at a high level, and the controlled end of the first electronic switch Q1 is turned on when receiving the first control signal V1, and at this time, the controlled end of the second electronic switch Q2 receives a high level and is turned off; the second control signal V2 is at a low level, and the controlled end of the first electronic switch Q1 is turned off when receiving the second control signal V2, and at this time, the controlled end of the second electronic switch Q2 receives a low level and is turned on. In one embodiment, the first electronic switch Q1 may also be a PMOS tube, and the second electronic switch Q2 may be an NMOS tube. The first control signal V1 is at a low level, and the controlled end of the first electronic switch Q1 is turned on when receiving the first control signal V1, and at this time, the controlled end of the second electronic switch Q2 receives a low level and is turned off; the second control signal V2 is at a high level, and the controlled end of the first electronic switch Q1 is turned off when receiving the second control signal V2, and at this time, the controlled end of the second electronic switch Q2 receives a high level and is turned on. Since the MOS tube has low impedance, it can pass large current, is not easily damaged by overcurrent, and has low power loss. It can be understood that the first electronic switch Q1 and the second electronic switch Q2 can also be switches such as triodes and IGBTs.

As shown in FIG8 , in one embodiment, a power supply control method is further provided, which is described by taking the method applied to the above power supply circuit as an example. The method includes:

Step 802, obtaining a power supply voltage Vbst of a power amplifier module; the power amplifier module is used to amplify the audio signal;

Step 804, controlling the switch module to switch on the first power supply path or the second power supply path between the power supply module and the power amplifier module according to the power supply voltage Vbst, so as to output a target voltage suitable for powering the power amplifier module; wherein the target voltage is a voltage of the first voltage Vbat and the second voltage Vph with a smaller voltage difference with the power supply voltage Vbst;

The first power supply path is used to output a first voltage Vbat to the power amplifier module, and the second power supply path is used to output a second voltage Vph to the power amplifier module; wherein the first voltage Vbat is the power supply voltage directly output by the power supply module, and the second voltage Vph is less than the first voltage Vbat.

For the specific definition of the power supply control method, please refer to the definition of the power supply circuit above, which will not be repeated here. It should be understood that although the various steps in the flowchart of Figure 8 are displayed in sequence as indicated by the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless otherwise clearly stated in this document, there is no strict order restriction for the execution of these steps, and these steps can be executed in other orders. Moreover, at least part of the steps in Figure 8 may include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be executed in turn or alternately with other steps or at least part of the steps or stages in other steps.

In one of the embodiments, an electronic device is also provided, including a speaker and a power supply circuit as described in the above embodiment, wherein a power amplifier module in the power supply circuit is connected to the speaker and is used to send an amplified signal to the speaker. Based on the fact that the power supply in the electronic device will step down the voltage when supplying power and then output a second voltage Vph for powering each device, the power supply circuit controls the switch module 300 to switch on the first power supply path or the second power supply path between the power supply module 100 and the power amplifier module 200 according to the power supply voltage Vbst of the power amplifier module 200, so as to output a target voltage with a smaller voltage difference with the power supply voltage Vbst suitable for powering the power amplifier module 200. The power amplifier module 200 has a higher power supply efficiency due to a smaller voltage difference when boosting.

In one embodiment, an electronic device is provided, including a power module 100, a power amplifier module 200, a memory and a processor, wherein a computer program is stored in the memory, and when the processor executes the computer program, the following steps are implemented:

Step 802, obtaining a power supply voltage Vbst of a power amplifier module; the power amplifier module is used to amplify the audio signal;

Step 804, controlling the switch module to switch on the first power supply path or the second power supply path between the power supply module and the power amplifier module according to the power supply voltage Vbst, so as to output a target voltage suitable for powering the power amplifier module; wherein the target voltage is a voltage of the first voltage Vbat and the second voltage Vph with a smaller voltage difference with the power supply voltage Vbst;

The first power supply path is used to output a first voltage Vbat to the power amplifier module, and the second power supply path is used to output a second voltage Vph to the power amplifier module; wherein the first voltage Vbat is the power supply voltage directly output by the power supply module, and the second voltage Vph is less than the first voltage Vbat.

In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored, and when the computer program is executed by a processor, the following steps are implemented:

Step 802, obtaining a power supply voltage Vbst of a power amplifier module; the power amplifier module is used to amplify the audio signal;

Step 804, controlling the switch module to switch on the first power supply path or the second power supply path between the power supply module and the power amplifier module according to the power supply voltage Vbst, so as to output a target voltage suitable for powering the power amplifier module; wherein the target voltage is a voltage of the first voltage Vbat and the second voltage Vph with a smaller voltage difference with the power supply voltage Vbst;

The first power supply path is used to output a first voltage Vbat to the power amplifier module, and the second power supply path is used to output a second voltage Vph to the power amplifier module; wherein the first voltage Vbat is the power supply voltage directly output by the power supply module, and the second voltage Vph is less than the first voltage Vbat.

Those of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in the present application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory or optical memory, etc. Volatile memory can include random access memory (RAM) or external cache memory. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM).

Referring to FIG9 , FIG9 is a block diagram of a partial structure related to an electronic device provided in an embodiment of the present application. The electronic device may include a radio frequency circuit 590, a memory 550 including one or more computer-readable storage media, an input unit 580, a display unit 570, a sensor 560, an audio circuit 530, a wireless fidelity (WiFi, Wireless Fidelity) module 520, a processor 510 including one or more processing cores, and a power module 100 and other components. It can be understood by those skilled in the art that the electronic device structure shown in FIG9 does not constitute a limitation on the electronic device, and may include more or fewer components than shown, or combine certain components, or arrange components differently.

The radio frequency circuit 590 may be used for receiving and sending information or receiving and sending signals during a call. It may receive downlink information from the base station and send it to the processor 510 for processing; it may also send uplink data to the base station.

The memory 550 can be used to store applications and data. The applications stored in the memory 550 include executable codes. The applications can form various functional modules. The processor 510 executes various functional applications and data processing by running the applications stored in the memory 550. The memory 550 can mainly include a program storage area and a data storage area, wherein the program storage area can store an operating system, an application required for at least one function (such as a sound playback function, an image playback function, etc.), etc.; the data storage area can store data created according to the use of the electronic device (such as audio data, a phone book, etc.), etc. In addition, the memory 550 can include a high-speed random access memory 550, and can also include a non-volatile memory 550, such as at least one disk storage 550, a flash memory device, or other volatile solid-state storage 550. Accordingly, the memory 550 can also include a memory 550 controller to provide the processor 510 and the input unit 580 with access to the memory 550.

The input unit 580 can be used to receive input digital, character information or user feature information (such as fingerprints), and generate keyboard, mouse, joystick, optical or trackball signal input related to user settings and function control. Specifically, in a specific embodiment, the input unit 580 may include a touch-sensitive surface 551 and other input devices 552. The touch-sensitive surface 551, also known as a touch display screen or a touchpad, can collect user touch operations on or near it (such as operations performed by users using fingers, styluses, or any other suitable objects or accessories on or near the touch-sensitive surface 551), and drive corresponding connection devices according to a pre-set program. Optionally, the touch-sensitive surface 551 may include a touch detection device and a touch controller. Among them, the touch detection device detects the user's touch orientation, detects the signal brought by the touch operation, and transmits the signal to the touch controller; the touch controller receives the touch information from the touch detection device, converts it into touch point coordinates, and then sends it to the processor 510, and can receive and execute commands sent by the processor 510.

The display unit 570 can be used to display information input by the user or information provided to the user and various graphical user interfaces of the electronic device, which can be composed of graphics, text, icons, videos and any combination thereof. The display unit 570 may include a display panel 571. Optionally, the display panel 571 may be configured in the form of a liquid crystal display (LCD, Liquid Crystal Display), an organic light-emitting diode (OLED, Organic Light-Emitting Diode), etc. Further, the touch-sensitive surface 551 may cover the display panel 571, and when the touch-sensitive surface 551 detects a touch operation on or near it, it is transmitted to the processor 510 to determine the type of touch event, and then the processor 510 provides corresponding visual output on the display panel 571 according to the type of touch event. Although in FIG. 9, the touch-sensitive surface 551 and the display panel 571 are implemented as two independent components to implement input and output functions, in some embodiments, the touch-sensitive surface 551 and the display panel 571 can be integrated to implement input and output functions. It can be understood that the display screen may include an input unit 580 and a display unit 570.

The electronic device may also include at least one sensor 560, such as a light sensor 560, a motion sensor 560, and other sensors 560. Specifically, the light sensor 560 may include an ambient light sensor 560 and a proximity sensor 560, wherein the ambient light sensor 560 may adjust the brightness of the display panel 571 according to the brightness of the ambient light, and the proximity sensor 560 may turn off the display panel 571 and/or the backlight when the electronic device is moved to the ear. As a type of motion sensor 560, the gravity acceleration sensor 560 may detect the magnitude of acceleration in each direction (generally three axes), and may detect the magnitude and direction of gravity when stationary, and may be used for applications that recognize the posture of the mobile phone (such as horizontal and vertical screen switching, related games, magnetometer posture calibration), vibration recognition related functions (such as pedometer, tapping), etc.; as for other sensors 560 such as gyroscopes, barometers, hygrometers, thermometers, infrared sensors 560, etc. that may also be configured in the electronic device, they will not be described in detail here.

The audio circuit 530 can provide an audio interface between the user and the electronic device through the speaker 531 and the microphone 532. The audio circuit 530 can convert the received audio data into an electrical signal, transmit it to the speaker 531, and the speaker 531 converts it into a sound signal for output; on the other hand, the microphone 532 converts the collected sound signal into an electrical signal, which is received by the audio circuit 530 and converted into audio data, and then the audio data is output to the processor 510 for processing, and then sent to another electronic device through the radio frequency circuit, or the audio data is output to the memory 550 for further processing. The audio circuit 530 may also include an earphone socket to provide communication between an external earphone and the electronic device.

The wireless fidelity (WiFi) module belongs to the short-range wireless transmission technology. The electronic device can help users receive emails, browse web pages and access streaming media through the wireless fidelity module 520, which provides users with wireless broadband Internet access. Although FIG9 shows the wireless fidelity module 520, it is understandable that it is not a necessary component of the electronic device and can be omitted as needed without changing the essence of the invention.

The processor 510 is the control center of the electronic device. It uses various interfaces and lines to connect various parts of the entire electronic device. It executes various functions of the electronic device and processes data by running or executing applications stored in the memory 550 and calling data stored in the memory 550, thereby monitoring the electronic device as a whole. Optionally, the processor 510 may include one or more processing cores; preferably, the processor 510 may integrate an application processor 510 and a modem processor 510, wherein the application processor 510 mainly processes the operating system, user interface, and application programs, and the modem processor 510 mainly processes wireless communications. It is understandable that the above-mentioned modem processor 510 may not be integrated into the processor 510.

The electronic device also includes a power module 100 for supplying power to various components. In one embodiment, the power module 100 can be logically connected to the processor through a power management system, so that the power management system can manage charging, discharging, and power consumption. The power module 100 can also include one or more DC or AC power supplies, recharging systems, power failure detection circuits, power converters or inverters, power status indicators, and other arbitrary components.

Although not shown in FIG9 , the electronic device may further include a Bluetooth module, etc., which will not be described in detail here. In specific implementation, the above modules may be implemented as independent entities, or may be arbitrarily combined and implemented as the same or several entities. The specific implementation of the above modules can refer to the previous method embodiments, which will not be described in detail here.

In the description of this specification, the description with reference to the terms "some embodiments", "other embodiments", "ideal embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example.

The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims (12)

1. A power supply circuit, comprising:

a power module for providing a first voltage and a second voltage;

the power amplifying module is used for receiving the audio signal and amplifying the audio signal to output an amplified signal;

The switch module is respectively connected with the power amplification module and the power supply module and is used for switching and conducting a first power supply path or a second power supply path between the power amplification module and the power supply module, the first power supply path is used for outputting the first voltage to the power amplification module, the second power supply path is used for outputting the second voltage to the power amplification module, the first voltage is a power supply voltage directly output by the power supply module, the second voltage is smaller than the first voltage, and the second voltage is a voltage output by the power supply module after the first voltage is subjected to step-down treatment;

The control module is respectively connected with the power amplification module and the switch module, and is used for acquiring the power supply voltage of the power amplification module and controlling the switch module to conduct the first power supply passage or the second power supply passage according to the power supply voltage so as to output target voltage suitable for supplying power to the power amplification module; the target voltage is a voltage with smaller voltage difference from the power supply voltage in the first voltage and the second voltage, and the power supply voltage is a voltage required by the power amplification module to amplify the audio signal.

2. The power supply circuit of claim 1, wherein the power amplification module comprises:

The power amplifier is used for amplifying the audio signal and outputting an amplified signal;

The boosting unit is respectively connected with the switch module and the power amplifier and is used for boosting the received first voltage or the received second voltage so as to supply power for the power amplifier module;

And the detection unit is respectively connected with the boosting unit and the control module, and is used for detecting the power supply voltage output by the boosting unit and outputting a feedback signal to the control module.

3. The power supply circuit of claim 2, wherein the boost unit is further configured to adjust a target value of the supply voltage based on the audio signal.

4. The power supply circuit of claim 2, wherein the power amplification module further comprises:

And the protection unit is connected with the power amplifier and is used for cutting off the connection between the power amplifier and a load when the abnormal output of the power amplifier is detected.

5. The power supply circuit of claim 1, wherein the control module comprises:

The comparator is respectively connected with the power amplifying module and the switch module and is used for outputting a first control signal or a second control signal according to the power supply voltage and a preset reference voltage;

The reference power supply is connected with the comparator and used for outputting reference voltage;

the switch module is used for conducting the first power supply path when the first control signal is received, and conducting the second power supply path when the second control signal is received.

6. The power supply circuit of claim 5, wherein the comparator is a hysteresis comparator;

The hysteresis comparator is used for outputting the first control signal when the power supply voltage is larger than an upper threshold voltage, outputting the second control signal when the power supply voltage is smaller than a lower threshold voltage, and maintaining the current state unchanged when the power supply voltage is between the upper threshold voltage and the lower threshold voltage; the upper threshold voltage is greater than the reference voltage, and the lower threshold voltage is less than the reference voltage.

7. The power supply circuit of claim 1, wherein the power module comprises:

The battery unit is connected with the switch module and used for outputting a first voltage;

and the voltage reducing unit is respectively connected with the battery unit and the switch module and is used for outputting a second voltage after the first voltage is subjected to voltage reducing treatment.

8. The power supply circuit of claim 7, wherein the switch module comprises a first electronic switch and a second electronic switch;

The first end of the first electronic switch is connected with the battery unit, the second end of the first electronic switch is connected with the power amplification module, and the controlled end of the first electronic switch is connected with the control module;

The first end of the second electronic switch is connected with the output end of the voltage reduction unit, the second end of the second electronic switch is connected with the power amplification module, and the controlled end of the second electronic switch is connected with the control module.

9. A power supply control method, characterized by comprising:

Acquiring a power supply voltage of a power amplification module; the power amplification module is used for amplifying an audio signal, and the power supply voltage is a voltage required by the power amplification module for amplifying the audio signal;

The power supply voltage control switch module is used for switching on a first power supply path or a second power supply path between the power supply module and the power amplification module according to the power supply voltage control switch module so as to output target voltage suitable for supplying power to the power amplification module; the power supply module is used for providing a first voltage and a second voltage, and the target voltage is a voltage with smaller voltage difference with the power supply voltage in the first voltage and the second voltage;

The first power supply path is used for outputting a first voltage to the power amplification module, and the second power supply path is used for outputting a second voltage to the power amplification module; the first voltage is a power supply voltage directly output by the power supply module, the second voltage is smaller than the first voltage, and the second voltage is a voltage output by the power supply module after the first voltage is subjected to step-down processing.

10. An electronic device, comprising:

a speaker; and

A power supply circuit as claimed in any one of claims 1 to 8, wherein a power amplification module in the power supply circuit is connected to the loudspeaker for sending an amplified signal to the loudspeaker.

11. An electronic device, comprising: a power supply module, a power amplification module, a memory and a processor, said memory storing a computer program, characterized in that the processor implements the steps of the method of claim 9 when executing said computer program.

12. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the method of claim 9.