CN114189576A

CN114189576A - Electronic device

Info

Publication number: CN114189576A
Application number: CN202010970738.6A
Authority: CN
Inventors: 段伟亮; 阎鑫淼; 朱辰
Original assignee: Honor Device Co Ltd
Current assignee: Honor Device Co Ltd
Priority date: 2020-09-15
Filing date: 2020-09-15
Publication date: 2022-03-15
Anticipated expiration: 2040-09-15
Also published as: CN116193010A; CN114189576B

Abstract

The application provides an electronic device, which includes: the system comprises a buck-boost converter, a mode control module, a low dropout linear regulator and a plurality of loads, wherein the plurality of loads comprise at least one camera and other loads except the at least one camera; the mode control module is used for acquiring the working states of a plurality of loads, and the working states comprise: at least one camera is in a first state of operation, and a second state of no camera operation; when the working state is the first state, the mode control module provides a first control signal for the buck-boost converter; the buck-boost converter is used for switching the working mode into the pulse width modulation mode under the control of the first control signal. Because the power supply ripple of the pulse width modulation mode is small, the influence of the power supply ripple on the camera can be eliminated, and the problem that dark stripes appear when the camera shoots under dark light is solved.

Description

Electronic device

Technical Field

The present application relates to the field of electronics, and in particular, to an electronic device.

Background

With the increasing requirements of people on functions such as photographing, the number of cameras arranged in electronic equipment is increasing. Although increasing the number of cameras can improve the shooting effect, it follows that the power consumption generated by the cameras increases dramatically; meanwhile, as the pixels of the camera become higher and higher, the power consumption is further increased, and the endurance time of the electronic device is shortened seriously.

In the prior art, in order to improve power efficiency in an electronic device and prolong a endurance time of the electronic device, some manufacturers adopt a buck-boost converter (buck converter) capable of automatically switching a working mode to supply power to a camera in a high-end electronic device.

Generally, a buck-boost converter automatically switches between two modes, which are a Pulse Width Modulation (PWM) mode and a Pulse Frequency Modulation (PFM) mode. When the number of working cameras is small, the buck-boost converter is switched to a PFM mode; when more cameras are in work, the buck-boost converter is switched to the PWM mode. By automatically switching the working mode, the working efficiency of the power supply of the buck-boost converter is improved.

However, since the camera is particularly sensitive to noise, when the buck-boost converter is switched to the PFM mode, the generated power supply ripple is large, and the shooting effect of the camera will be seriously affected.

Therefore, manufacturers add a low-dropout regulator (LDO) between the buck-boost converter and the camera to filter the interference, but when the Power Supply Rejection Ratio (PSRR) of the LDO is poor, the camera is prone to have a dark stripe problem under dark light, which affects the shooting effect.

Disclosure of Invention

The application provides an electronic equipment has solved the camera and has appeared the problem of dark stripe easily under the dim light, has improved the shooting effect.

In order to achieve the purpose, the technical scheme is as follows:

in a first aspect, an electronic device is provided, including: the system comprises a buck-boost converter, a mode control module, a low dropout linear regulator and a plurality of loads, wherein the plurality of loads comprise at least one camera and other loads except the at least one camera; the buck-boost converter is respectively electrically connected with the mode control module, the low dropout linear regulator and other loads; the buck-boost converter is used for generating working voltages of a plurality of loads; the low dropout linear regulator is also electrically connected with the at least one camera and is used for reducing ripples of working voltage provided by the buck-boost converter for the at least one camera; the mode control module is used for acquiring the working states of a plurality of loads, and the working states comprise: at least one camera is in a first state of operation, and a second state of no camera operation; when the working state is the first state, the mode control module provides a first control signal for the buck-boost converter; the buck-boost converter is used for switching the working mode into the pulse width modulation mode under the control of the first control signal.

The electronic device provided by the first aspect comprises a buck-boost converter, a mode control module, a low dropout regulator and a plurality of loads, wherein the plurality of loads comprise at least one camera and other loads except the at least one camera. Based on this, when at least one camera is at the during operation, provide first control signal to the buck-boost converter through mode control module, make the buck-boost converter work in pulse width modulation mode, because the power ripple of pulse width modulation mode is less to can eliminate the influence of power ripple to the camera, solve the camera and shoot the problem that appears the dark stripe under the dim light.

With reference to the first aspect, in a possible implementation manner of the first aspect, the electronic device further includes: when the working state is the second state, the mode control module provides a second control signal for the buck-boost converter; the buck-boost converter is used for automatically switching the working mode between the pulse width modulation mode and the pulse frequency modulation mode under the control of the second control signal. In this implementation manner, in the embodiment of the application, under the condition that no camera works, the mode control module provides the second control signal to the buck-boost converter, so that the buck-boost converter is automatically switched between the pulse width modulation mode and the pulse frequency modulation mode, and the purposes of reducing power consumption and improving power efficiency can be achieved.

With reference to the first aspect, in a possible implementation manner of the first aspect, the electronic device further includes an enable control terminal for providing an enable signal, and the buck-boost converter includes an enable terminal and a mode selection terminal; the enabling control end is electrically connected with the enabling end, the enabling control end provides enabling signals for the enabling end of the buck-boost converter, and the buck-boost converter is used for starting to work under the control of the enabling signals; the mode control module is electrically connected with the mode selection end; when the working state is the first state, the mode control module provides a first control signal for the mode selection end of the buck-boost converter; and when the working state is the second state, the mode control module provides a second control signal for the mode selection end of the buck-boost converter. In the implementation mode, the buck-boost converter starts to work by providing the enable signal to the enable end, and simultaneously, the mode of the buck-boost converter is controlled by providing the first control signal or the second control signal to the mode selection end.

With reference to the first aspect, in a possible implementation manner of the first aspect, at least one camera has a feedback voltage end, and the mode control module is electrically connected to the feedback voltage end of the at least one camera; when the working state is a first state, the mode control module is used for generating a first control signal under the control of a first voltage provided by the feedback voltage end; and when the working state is the second state, the mode control module is also used for generating a second control signal under the control of a second voltage provided by the feedback voltage end. In this implementation manner, the mode control module obtains the working state of the camera by electrically connecting with the feedback voltage terminal of the camera, and then outputs the first control signal and the second control signal according to whether the camera works or not.

With reference to the first aspect, in a possible implementation manner of the first aspect, the mode control module includes a first transistor and a first resistor; the grid electrode of the first transistor is electrically connected with the feedback voltage end, the first electrode of the first transistor is electrically connected with the grounding end, and the second electrode of the first transistor is electrically connected with the mode selection end; the first end of the first resistor is electrically connected with the mode selection end, and the second end of the first resistor is electrically connected with the enable control end. In this implementation manner, the mode control module obtains the working state of the camera by electrically connecting with the feedback voltage terminal of the camera, and then controls the first transistor to be turned on and off according to whether the camera works, so as to generate the first control signal and the second control signal.

With reference to the first aspect, in a possible implementation manner of the first aspect, the electronic device further includes a processor having a general input/output interface; the mode control module is electrically connected with the universal input/output interface; when the working state is the first state, the mode control module is used for generating a first control signal under the control of a third voltage from the universal input/output interface; and when the working state is the second state, the mode control module is used for generating a second control signal under the control of the fourth voltage from the general input/output interface. In this implementation manner, the mode control module obtains the working state of the camera by electrically connecting with the general input/output interface of the processor, and then can output the first control signal or the second control signal according to whether the camera works or not.

With reference to the first aspect, in a possible implementation manner of the first aspect, when the working state is the first state, the processor is further configured to determine a gain and an exposure time of the camera, and when the gain and the exposure time meet preset conditions, provide a third voltage to the gpio interface. In the implementation mode, the processor determines the gain and the exposure time of the camera to judge the environment of the camera, and when the preset condition is met, the third voltage is provided through the general input and output interface, so that the buck-boost converter is in a pulse width modulation mode.

With reference to the first aspect, in a possible implementation manner of the first aspect, the mode control module includes a second resistor and a third resistor; the first end of the second resistor is electrically connected with the general input/output interface, and the second end of the second resistor is electrically connected with the mode selection end; the first end of the third resistor is electrically connected with the mode selection end, and the second end of the third resistor is electrically connected with the enable control end.

In a second aspect, a method for controlling an electronic device is provided, where the method is applied to the electronic device, and includes: the buck-boost converter generates working voltages of a plurality of loads; the low-dropout linear regulator reduces ripples of working voltage provided by the buck-boost converter for the at least one camera; when the working state is the first state, the mode control module provides a first control signal for the buck-boost converter; under the control of the first control signal, the buck-boost converter switches the working mode into the pulse width modulation mode.

With reference to the second aspect, in a possible implementation manner of the second aspect, the method further includes: when the working state is the second state, the mode control module provides a second control signal for the buck-boost converter; and under the control of the second control signal, the buck-boost converter automatically switches the working mode between the pulse width modulation mode and the pulse frequency modulation mode.

With reference to the second aspect, in a possible implementation manner of the second aspect, the generating the operating voltages of the plurality of loads by the buck-boost converter includes: the enabling control end provides an enabling signal for the enabling end of the buck-boost converter, and the buck-boost converter starts to work under the control of the enabling signal; when the working state is the first state, the mode control module provides a first control signal to the buck-boost converter and comprises: when the working state is the first state, the mode control module provides a first control signal for the mode selection end of the buck-boost converter; when the operating condition is the second state, the mode control module provides a second control signal to the buck-boost converter and includes: and when the working state is the second state, the mode control module provides a second control signal for the mode selection end of the buck-boost converter.

With reference to the second aspect, in a possible implementation manner of the second aspect, the providing, by the mode control module, a first control signal to a mode selection terminal of the buck-boost converter includes: under the control of a first voltage from a feedback voltage end, a mode control module provides a first control signal to a mode selection end of the buck-boost converter; the mode control module provides a second control signal to a mode selection end of the buck-boost converter, and the mode control module comprises: the mode control module provides a second control signal to the mode selection terminal of the buck-boost converter under control of a second voltage from the feedback voltage terminal.

With reference to the second aspect, in a possible implementation manner of the second aspect, under control of a first voltage from the feedback voltage terminal, the providing, by the mode control module, a first control signal to the mode selection terminal of the buck-boost converter includes: the feedback voltage end transmits a first voltage to the grid electrode of the first transistor to enable the first transistor to be conducted, and the ground level of the grounding end serves as a first control signal and is provided to the mode selection end of the buck-boost converter; under the control of a second voltage from the feedback voltage end, the mode control module provides a second control signal to the mode selection end of the buck-boost converter, and the mode control module comprises: the feedback voltage end transmits the second voltage to the grid electrode of the first transistor to enable the first transistor to be cut off, and the enabling signal of the enabling signal end serves as a second control signal and is provided to the mode selection end of the buck-boost converter.

With reference to the second aspect, in a possible implementation manner of the second aspect, the providing, by the mode control module, a first control signal to a mode selection terminal of the buck-boost converter includes: under the control of a third voltage from the universal input/output interface, the mode control module provides a first control signal to a mode selection end of the buck-boost converter; the mode control module provides a second control signal to a mode selection end of the buck-boost converter, and the mode control module comprises: and under the control of the fourth voltage from the universal input/output interface, the mode control module provides a second control signal to the mode selection end of the buck-boost converter.

With reference to the second aspect, in a possible implementation manner of the second aspect, before the mode control module provides the first control signal to the mode selection terminal of the buck-boost converter under the control of the third voltage from the general input output interface, the method further includes: the processor determines the gain and the exposure time of the camera; and when the gain and the exposure time of the camera meet preset conditions, the processor provides a third voltage for the general input/output interface.

It is understood that the beneficial effects of the second aspect can be referred to the related description of the first aspect, and are not described herein again.

Drawings

Fig. 1 is a schematic structural diagram of an electronic device according to an embodiment of the present disclosure;

fig. 2 is a schematic structural diagram of an electronic device according to an embodiment of the present disclosure;

FIG. 3 is a timing diagram of a PWM mode and a PFM mode according to an embodiment of the present disclosure;

fig. 4 is a schematic circuit diagram of a buck-boost converter according to an embodiment of the present disclosure;

fig. 5 is a schematic structural diagram of another electronic device provided in the embodiment of the present application;

fig. 6 is a circuit schematic diagram of an LDO according to an embodiment of the present application;

fig. 7 is a schematic structural diagram of another electronic device provided in the embodiment of the present application;

fig. 8 is a schematic structural diagram of another electronic device provided in the embodiment of the present application;

fig. 9 is a schematic structural diagram of another electronic device provided in the embodiment of the present application;

fig. 10 is a schematic structural diagram of another electronic device provided in the embodiment of the present application;

fig. 11 is a schematic structural diagram of another electronic device provided in the embodiment of the present application;

fig. 12 is a schematic diagram of a chip structure corresponding to a buck-boost converter according to an embodiment of the present disclosure;

fig. 13 is a schematic diagram of a chip structure corresponding to another buck-boost converter according to an embodiment of the present disclosure;

fig. 14 is a schematic connection diagram of a buck-boost converter and a mode control module according to an embodiment of the present disclosure;

fig. 15 is a schematic connection diagram of another buck-boost converter and a mode control module according to an embodiment of the present disclosure;

fig. 16 is a flowchart illustrating a control method of an electronic device according to an embodiment of the present application.

Detailed Description

The technical solution in the present application will be described below with reference to the accompanying drawings.

In the description of this application, "/" means "or" unless otherwise stated, for example, A/B may mean A or B. "and/or" herein is merely an association describing an associated object, and means that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. Further, "at least one" means one or more, "a plurality" means two or more. The terms "first", "second", and the like do not necessarily limit the number and execution order, and the terms "first", "second", and the like do not necessarily limit the difference.

It is noted that, in the present application, words such as "exemplary" or "for example" are used to mean exemplary, illustrative, or descriptive. Any embodiment or design described herein as "exemplary" or "e.g.," is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, use of the word "exemplary" or "such as" is intended to present concepts related in a concrete fashion.

In the prior art, as the requirements of people on functions such as photographing are improved, the number of cameras arranged in electronic equipment is more and more. Although the increase of the number of cameras can improve the photographing effect, the power consumption generated by the cameras is increased sharply; meanwhile, as the pixels of the camera become higher and higher, the power consumption is further increased, and the endurance time of the electronic device is shortened seriously.

By way of example, fig. 1 shows a schematic diagram of a possible structure of the electronic device 100. The electronic device 100 may include a processor 110, an external memory interface 120, an internal memory 121, a Universal Serial Bus (USB) interface 130, a charging management module 140, a power management module 141, a battery 142, an antenna 1, an antenna 2, a mobile communication module 150, a wireless communication module 160, an audio module 170, a speaker 170A, a receiver 170B, a microphone 170C, an earphone interface 170D, a sensor module 180, a key 190, a motor 191, an indicator 192, a camera 193, a display screen 194, a Subscriber Identification Module (SIM) card interface 195, and the like. The sensor module 180 may include a pressure sensor 180A, a gyroscope sensor 180B, an air pressure sensor 180C, a magnetic sensor 180D, an acceleration sensor 180E, a distance sensor 180F, a proximity light sensor 180G, a fingerprint sensor 180H, a temperature sensor 180J, a touch sensor 180K, an ambient light sensor 180L, and the like.

Processor 110 may include one or more processing units, such as: the processor 110 may include an Application Processor (AP), a modem processor, a Central Processing Unit (CPU), a Graphics Processing Unit (GPU), an Image Signal Processor (ISP), a controller, a memory, a video codec, a Digital Signal Processor (DSP), a baseband processor, and/or a neural-Network Processing Unit (NPU), etc. The different processors may be separate devices or may be integrated into one or more processors.

In some embodiments, the processor 110 may perform the segmentation of the traffic to be processed, the processing and calculation of the traffic, and the like. For example, rendering of images (for example, rendering of game screens), processing of videos, processing of audios, and Artificial Intelligence (AI) calculation are performed. Further, the processor 110 may also obtain the storage space condition in the memory, the processing capability of the CPU, GPU, DSP, NPU, etc., and the calculation load condition.

The controller may be, among other things, a neural center and a command center of the electronic device 100. The controller can generate an operation control signal according to the instruction operation code and the timing signal to complete the control of instruction fetching and instruction execution.

A memory may also be provided in processor 110 for storing instructions and data. In some embodiments, the memory in the processor 110 is a cache memory. The memory may hold instructions or data that have just been used or recycled by the processor 110. If the processor 110 needs to reuse the instruction or data, it can be called directly from the memory. Avoiding repeated accesses reduces the latency of the processor 110, thereby increasing the efficiency of the system.

In some embodiments, processor 110 may include one or more interfaces. The interface may include an integrated circuit (I2C) interface, an integrated circuit built-in audio (I2S) interface, a Pulse Code Modulation (PCM) interface, a universal asynchronous receiver/transmitter (UART) interface, a Mobile Industry Processor Interface (MIPI), a general-purpose input/output (GPIO) interface, a Subscriber Identity Module (SIM) interface, and/or a Universal Serial Bus (USB) interface, etc.

The I2C interface is a bi-directional synchronous serial bus that includes a serial data line (SDA) and a Serial Clock Line (SCL). In some embodiments, processor 110 may include multiple sets of I2C buses. The processor 110 may be coupled to the touch sensor 180K, the charger, the flash, the camera 193, etc. through different I2C bus interfaces, respectively. For example: the processor 110 may be coupled to the touch sensor 180K via an I2C interface, such that the processor 110 and the touch sensor 180K communicate via an I2C bus interface to implement the touch functionality of the electronic device 100.

The I2S interface may be used for audio communication. In some embodiments, processor 110 may include multiple sets of I2S buses. The processor 110 may be coupled to the audio module 170 via an I2S bus to enable communication between the processor 110 and the audio module 170. In some embodiments, the audio module 170 may communicate audio signals to the wireless communication module 160 via the I2S interface, enabling answering of calls via a bluetooth headset.

The PCM interface may also be used for audio communication, sampling, quantizing and encoding analog signals. In some embodiments, the audio module 170 and the wireless communication module 160 may be coupled by a PCM bus interface. In some embodiments, the audio module 170 may also transmit audio signals to the wireless communication module 160 through the PCM interface, so as to implement a function of answering a call through a bluetooth headset. Both the I2S interface and the PCM interface may be used for audio communication.

The UART interface is a universal serial data bus used for asynchronous communications. The bus may be a bidirectional communication bus. It converts the data to be transmitted between serial communication and parallel communication. In some embodiments, a UART interface is generally used to connect the processor 110 with the wireless communication module 160. For example: the processor 110 communicates with a bluetooth module in the wireless communication module 160 through a UART interface to implement a bluetooth function. In some embodiments, the audio module 170 may transmit the audio signal to the wireless communication module 160 through a UART interface, so as to realize the function of playing music through a bluetooth headset.

MIPI interfaces may be used to connect processor 110 with peripheral devices such as display screen 194, camera 193, and the like. The MIPI interface includes a Camera Serial Interface (CSI), a Display Serial Interface (DSI), and the like. In some embodiments, processor 110 and camera 193 communicate through a CSI interface to implement the capture functionality of electronic device 100. The processor 110 and the display screen 194 communicate through the DSI interface to implement the display function of the electronic device 100.

The GPIO interface may be configured by software. The GPIO interface may be configured as a control signal and may also be configured as a data signal. In some embodiments, a GPIO interface may be used to connect the processor 110 with the camera 193, the display 194, the wireless communication module 160, the audio module 170, the sensor module 180, and the like. The GPIO interface may also be configured as an I2C interface, an I2S interface, a UART interface, a MIPI interface, and the like.

The USB interface 130 is an interface conforming to the USB standard specification, and may specifically be a Mini USB interface, a Micro USB interface, a USB Type C interface, or the like. The USB interface 130 may be used to connect a charger to charge the electronic device 100, and may also be used to transmit data between the electronic device 100 and a peripheral device. And the earphone can also be used for connecting an earphone and playing audio through the earphone. The interface may also be used to connect other electronic devices, such as AR devices and the like.

It should be understood that the interface connection relationship between the modules illustrated in the embodiments of the present application is only an illustration, and does not limit the structure of the electronic device 100. In other embodiments of the present application, the electronic device 100 may also adopt different interface connection manners or a combination of multiple interface connection manners in the above embodiments.

The charging management module 140 is configured to receive charging input from a charger. The charger may be a wireless charger or a wired charger. In some wired charging embodiments, the charging management module 140 may receive charging input from a wired charger via the USB interface 130. In some wireless charging embodiments, the charging management module 140 may receive a wireless charging input through a wireless charging coil of the electronic device 100. The charging management module 140 may also supply power to the electronic device through the power management module 141 while charging the battery 142.

The power management module 141 is used to connect the battery 142, the charging management module 140 and the processor 110. The power management module 141 receives input from the battery 142 and/or the charge management module 140 and provides power to the processor 110, the internal memory 121, the external memory, the display 194, the camera 193, the wireless communication module 160, and the like. The power management module 141 may also be used to monitor parameters such as battery capacity, battery cycle count, battery state of health (leakage, impedance), etc. In some other embodiments, the power management module 141 may also be disposed in the processor 110. In other embodiments, the power management module 141 and the charging management module 140 may be disposed in the same device.

In some embodiments, the power management module 141 may determine the remaining power of the mobile phone in real time, and further determine the power consumption rate over a period of time, and the like.

The wireless communication function of the electronic device 100 may be implemented by the antenna 1, the antenna 2, the mobile communication module 150, the wireless communication module 160, a modem processor, a baseband processor, and the like.

The

antennas

1 and 2 are used for transmitting and receiving electromagnetic wave signals. Each antenna in the electronic device 100 may be used to cover a single or multiple communication bands. Different antennas can also be multiplexed to improve the utilization of the antennas. For example: the antenna 1 may be multiplexed as a diversity antenna of a wireless local area network. In other embodiments, the antenna may be used in conjunction with a tuning switch.

The mobile communication module 150 may provide a solution including 2G/3G/4G/5G wireless communication applied to the electronic device 100. The mobile communication module 150 may include at least one filter, a switch, a power amplifier, a Low Noise Amplifier (LNA), and the like. The mobile communication module 150 may receive the electromagnetic wave from the antenna 1, filter, amplify, etc. the received electromagnetic wave, and transmit the electromagnetic wave to the modem processor for demodulation. The mobile communication module 150 may also amplify the signal modulated by the modem processor, and convert the signal into electromagnetic wave through the antenna 1 to radiate the electromagnetic wave. In some embodiments, at least some of the functional modules of the mobile communication module 150 may be disposed in the processor 110. In some embodiments, at least some of the functional modules of the mobile communication module 150 may be disposed in the same device as at least some of the modules of the processor 110.

The modem processor may include a modulator and a demodulator. The modulator is used for modulating a low-frequency baseband signal to be transmitted into a medium-high frequency signal. The demodulator is used for demodulating the received electromagnetic wave signal into a low-frequency baseband signal. The demodulator then passes the demodulated low frequency baseband signal to a baseband processor for processing. The low frequency baseband signal is processed by the baseband processor and then transferred to the application processor. The application processor outputs a sound signal through an audio device (not limited to the speaker 170A, the receiver 170B, etc.) or displays an image or video through the display screen 194. In some embodiments, the modem processor may be a stand-alone device. In other embodiments, the modem processor may be provided in the same device as the mobile communication module 150 or other functional modules, independent of the processor 110.

The wireless communication module 160 may provide a solution for wireless communication applied to the electronic device 100, including Wireless Local Area Networks (WLANs) (e.g., wireless fidelity (Wi-Fi) networks), bluetooth (bluetooth, BT), Global Navigation Satellite System (GNSS), Frequency Modulation (FM), Near Field Communication (NFC), Infrared (IR), and the like. The wireless communication module 160 may be one or more devices integrating at least one communication processing module. The wireless communication module 160 receives electromagnetic waves via the antenna 2, performs frequency modulation and filtering processing on electromagnetic wave signals, and transmits the processed signals to the processor 110. The wireless communication module 160 may also receive a signal to be transmitted from the processor 110, perform frequency modulation and amplification on the signal, and convert the signal into electromagnetic waves through the antenna 2 to radiate the electromagnetic waves.

In some embodiments, the electronic device 100 may discover other electronic devices and establish a communication connection with other electronic devices through the wireless communication module 160 to form a local area network, transmit data or information to each other, and the like. For example, communication connection is established with other electronics through communication technologies such as NFC, bluetooth, and Wi-Fi network, and service information that needs to be processed by each and processing capability, remaining power, storage space, power consumption, calculation result, and the like of each are interacted.

In some embodiments, antenna 1 of electronic device 100 is coupled to mobile communication module 150 and antenna 2 is coupled to wireless communication module 160 so that electronic device 100 can communicate with networks and other devices through wireless communication techniques. The wireless communication technology may include global system for mobile communications (GSM), General Packet Radio Service (GPRS), code division multiple access (code division multiple access, CDMA), Wideband Code Division Multiple Access (WCDMA), time-division code division multiple access (time-division code division multiple access, TD-SCDMA), Long Term Evolution (LTE), LTE, BT, GNSS, WLAN, NFC, FM, and/or IR technologies, etc. The GNSS may include a Global Positioning System (GPS), a global navigation satellite system (GLONASS), a beidou navigation satellite system (BDS), a quasi-zenith satellite system (QZSS), and/or a Satellite Based Augmentation System (SBAS).

The electronic device 100 implements display functions via the GPU, the display screen 194, and the application processor. The GPU is a microprocessor for image processing, and is connected to the display screen 194 and an application processor. The GPU is used to perform mathematical and geometric calculations for graphics rendering. The processor 110 may include one or more GPUs that execute program instructions to generate or alter display information.

The display screen 194 is used to display images, video, and the like. The display screen 194 includes a display panel. The display panel may adopt a Liquid Crystal Display (LCD), an organic light-emitting diode (OLED), an active-matrix organic light-emitting diode (active-matrix organic light-emitting diode, AMOLED), a flexible light-emitting diode (FLED), a miniature, a Micro-oeld, a quantum dot light-emitting diode (QLED), and the like. In some embodiments, the electronic device 100 may include 1 or N display screens 194, with N being a positive integer greater than 1. The display screen 194 may display other electronics to the user that may be paired or connected with the electronic device 100 for the user to establish a local area network of multiple electronics. Also, the display screen 194 may display an image screen, a video screen, and the like to the user.

The electronic device 100 may implement a shooting function through the ISP, the camera 193, the video codec, the GPU, the display 194, the application processor, and the like.

The ISP is used to process the data fed back by the camera 193. For example, when a photo is taken, the shutter is opened, light is transmitted to the camera photosensitive element through the lens, the optical signal is converted into an electrical signal, and the camera photosensitive element transmits the electrical signal to the ISP for processing and converting into an image visible to naked eyes. The ISP can also carry out algorithm optimization on the noise, brightness and skin color of the image. The ISP can also optimize parameters such as exposure, color temperature and the like of a shooting scene. In some embodiments, the ISP may be provided in camera 193.

The camera 193 is used to capture still images or video. The object generates an optical image through the lens and projects the optical image to the photosensitive element. The photosensitive element may be a Charge Coupled Device (CCD) or a complementary metal-oxide-semiconductor (CMOS) phototransistor. The light sensing element converts the optical signal into an electrical signal, which is then passed to the ISP where it is converted into a digital image signal. And the ISP outputs the digital image signal to the DSP for processing. The DSP converts the digital image signal into image signal in standard RGB, YUV and other formats. In some embodiments, the electronic device 100 may include 1 or N cameras 193, N being a positive integer greater than 1.

The digital signal processor is used for processing digital signals, and can process digital image signals and other digital signals. Such as video digital signals, audio digital signals, etc.

Video codecs are used to compress or decompress digital video. The electronic device 100 may support one or more video codecs. In this way, the electronic device 100 may play or record video in a variety of encoding formats, such as: moving Picture Experts Group (MPEG) 1, MPEG2, MPEG3, MPEG4, and the like.

The NPU is a neural-network (NN) computing processor that processes input information quickly by using a biological neural network structure, for example, by using a transfer mode between neurons of a human brain, and can also learn by itself continuously. Applications such as intelligent recognition of the electronic device 100 can be realized through the NPU, for example: image recognition, face recognition, speech recognition, text understanding, and the like.

The external memory interface 120 may be used to connect an external memory card, such as a Micro SD card, to extend the memory capability of the electronic device 100. The external memory card communicates with the processor 110 through the external memory interface 120 to implement a data storage function. For example, files such as music, video, etc. are saved in an external memory card.

The internal memory 121 may be used to store computer-executable program code, which includes instructions. The processor 110 executes various functional applications of the electronic device 100 and data processing by executing instructions stored in the internal memory 121. The internal memory 121 may include a program storage area and a data storage area. The storage program area may store an operating system, an application program (such as a sound playing function, an image playing function, etc.) required by at least one function, and the like. The storage data area may store data (such as audio data, phone book, etc.) created during use of the electronic device 100, and the like. In addition, the internal memory 121 may include a high-speed random access memory, and may further include a nonvolatile memory, such as at least one magnetic disk storage device, a flash memory device, a universal flash memory (UFS), and the like.

The electronic device 100 may implement audio functions via the audio module 170, the speaker 170A, the receiver 170B, the microphone 170C, the headphone interface 170D, and the application processor. Such as music playing, recording, etc.

The audio module 170 is used to convert digital audio information into an analog audio signal output and also to convert an analog audio input into a digital audio signal. The audio module 170 may also be used to encode and decode audio signals. In some embodiments, the audio module 170 may be disposed in the processor 110, or some functional modules of the audio module 170 may be disposed in the processor 110.

The speaker 170A, also called a "horn", is used to convert the audio electrical signal into an acoustic signal. The electronic apparatus 100 can listen to music through the speaker 170A or listen to a handsfree call.

The receiver 170B, also called "earpiece", is used to convert the electrical audio signal into an acoustic signal. When the electronic apparatus 100 receives a call or voice information, it can receive voice by placing the receiver 170B close to the ear of the person.

The microphone 170C, also referred to as a "microphone," is used to convert sound signals into electrical signals. When making a call or transmitting voice information, the user can input a voice signal to the microphone 170C by speaking the user's mouth near the microphone 170C. The electronic device 100 may be provided with at least one microphone 170C. In other embodiments, the electronic device 100 may be provided with two microphones 170C to achieve a noise reduction function in addition to collecting sound signals. In other embodiments, the electronic device 100 may further include three, four or more microphones 170C to collect sound signals, reduce noise, identify sound sources, perform directional recording, and so on.

The headphone interface 170D is used to connect a wired headphone. The headset interface 170D may be the USB interface 130, or may be a 3.5mm open mobile electronic device platform (OMTP) standard interface, a cellular telecommunications industry association (cellular telecommunications industry association of the USA, CTIA) standard interface.

The pressure sensor 180A is used for sensing a pressure signal, and converting the pressure signal into an electrical signal. In some embodiments, the pressure sensor 180A may be disposed on the display screen 194. The pressure sensor 180A can be of a wide variety, such as a resistive pressure sensor, an inductive pressure sensor, a capacitive pressure sensor, and the like. The capacitive pressure sensor may be a sensor comprising at least two parallel plates having an electrically conductive material. When a force acts on the pressure sensor 180A, the capacitance between the electrodes changes. The electronic device 100 determines the strength of the pressure from the change in capacitance. When a touch operation is applied to the display screen 194, the electronic apparatus 100 detects the intensity of the touch operation according to the pressure sensor 180A. The electronic apparatus 100 may also calculate the touched position from the detection signal of the pressure sensor 180A. In some embodiments, the touch operations that are applied to the same touch position but different touch operation intensities may correspond to different operation instructions. For example: and when the touch operation with the touch operation intensity smaller than the first pressure threshold value acts on the short message application icon, executing an instruction for viewing the short message. And when the touch operation with the touch operation intensity larger than or equal to the first pressure threshold value acts on the short message application icon, executing an instruction of newly building the short message.

The gyro sensor 180B may be used to determine the motion attitude of the electronic device 100. In some embodiments, the angular velocity of electronic device 100 about three axes (i.e., the x, y, and z axes) may be determined by gyroscope sensor 180B. The gyro sensor 180B may be used for photographing anti-shake. For example, when the shutter is pressed, the gyro sensor 180B detects a shake angle of the electronic device 100, calculates a distance to be compensated for by the lens module according to the shake angle, and allows the lens to counteract the shake of the electronic device 100 through a reverse movement, thereby achieving anti-shake. The gyroscope sensor 180B may also be used for navigation, somatosensory gaming scenes.

The air pressure sensor 180C is used to measure air pressure. In some embodiments, electronic device 100 calculates altitude, aiding in positioning and navigation, from barometric pressure values measured by barometric pressure sensor 180C.

The magnetic sensor 180D includes a hall sensor. The electronic device 100 may detect the opening and closing of the flip holster using the magnetic sensor 180D. In some embodiments, when the electronic device 100 is a flip phone, the electronic device 100 may detect the opening and closing of the flip according to the magnetic sensor 180D. And then according to the opening and closing state of the leather sheath or the opening and closing state of the flip cover, the automatic unlocking of the flip cover is set.

The acceleration sensor 180E may detect the magnitude of acceleration of the electronic device 100 in various directions (typically three axes). The magnitude and direction of gravity can be detected when the electronic device 100 is stationary. The method can also be used for recognizing the posture of the electronic equipment, and is applied to horizontal and vertical screen switching, pedometers and other applications.

A distance sensor 180F for measuring a distance. The electronic device 100 may measure the distance by infrared or laser. In some embodiments, taking a picture of a scene, electronic device 100 may utilize range sensor 180F to range for fast focus.

The proximity light sensor 180G may include, for example, a Light Emitting Diode (LED) and a light detector, such as a photodiode. The light emitting diode may be an infrared light emitting diode. The electronic device 100 emits infrared light to the outside through the light emitting diode. The electronic device 100 detects infrared reflected light from nearby objects using a photodiode. When sufficient reflected light is detected, it can be determined that there is an object near the electronic device 100. When insufficient reflected light is detected, the electronic device 100 may determine that there are no objects near the electronic device 100. The electronic device 100 can utilize the proximity light sensor 180G to detect that the user holds the electronic device 100 close to the ear for talking, so as to automatically turn off the screen to achieve the purpose of saving power. The proximity light sensor 180G may also be used in a holster mode, a pocket mode automatically unlocks and locks the screen.

The ambient light sensor 180L is used to sense the ambient light level. Electronic device 100 may adaptively adjust the brightness of display screen 194 based on the perceived ambient light level. The ambient light sensor 180L may also be used to automatically adjust the white balance when taking a picture. The ambient light sensor 180L may also cooperate with the proximity light sensor 180G to detect whether the electronic device 100 is in a pocket to prevent accidental touches.

The fingerprint sensor 180H is used to collect a fingerprint. The electronic device 100 can utilize the collected fingerprint characteristics to unlock the fingerprint, access the application lock, photograph the fingerprint, answer an incoming call with the fingerprint, and so on.

The temperature sensor 180J is used to detect temperature. In some embodiments, electronic device 100 implements a temperature processing strategy using the temperature detected by temperature sensor 180J. For example, when the temperature reported by the temperature sensor 180J exceeds a threshold, the electronic device 100 performs a reduction in performance of a processor located near the temperature sensor 180J, so as to reduce power consumption and implement thermal protection. In other embodiments, the electronic device 100 heats the battery 142 when the temperature is below another threshold to avoid the low temperature causing the electronic device 100 to shut down abnormally. In other embodiments, when the temperature is lower than a further threshold, the electronic device 100 performs boosting on the output voltage of the battery 142 to avoid abnormal shutdown due to low temperature.

The touch sensor 180K is also referred to as a "touch panel". The touch sensor 180K may be disposed on the display screen 194, and the touch sensor 180K and the display screen 194 form a touch screen, which is also called a "touch screen". The touch sensor 180K is used to detect a touch operation applied thereto or nearby. The touch sensor can communicate the detected touch operation to the application processor to determine the touch event type. Visual output associated with the touch operation may be provided through the display screen 194. In other embodiments, the touch sensor 180K may be disposed on a surface of the electronic device 100, different from the position of the display screen 194.

The keys 190 include a power-on key, a volume key, and the like. The keys 190 may be mechanical keys. Or may be touch keys. The electronic apparatus 100 may receive a key input, and generate a key signal input related to user setting and function control of the electronic apparatus 100.

The motor 191 may generate a vibration cue. The motor 191 may be used for incoming call vibration cues, as well as for touch vibration feedback. For example, touch operations applied to different applications (e.g., photographing, audio playing, etc.) may correspond to different vibration feedback effects. The motor 191 may also respond to different vibration feedback effects for touch operations applied to different areas of the display screen 194. Different application scenes (such as time reminding, receiving information, alarm clock, game and the like) can also correspond to different vibration feedback effects. The touch vibration feedback effect may also support customization.

Indicator 192 may be an indicator light that may be used to indicate a state of charge, a change in charge, or a message, missed call, notification, etc.

The SIM card interface 195 is used to connect a SIM card. The SIM card can be brought into and out of contact with the electronic apparatus 100 by being inserted into the SIM card interface 195 or being pulled out of the SIM card interface 195. The electronic device 100 may support 1 or N SIM card interfaces, N being a positive integer greater than 1. The SIM card interface 195 may support a Nano SIM card, a Micro SIM card, a SIM card, etc. The same SIM card interface 195 can be inserted with multiple cards at the same time. The types of the plurality of cards may be the same or different. The SIM card interface 195 may also be compatible with different types of SIM cards. The SIM card interface 195 may also be compatible with external memory cards. The electronic device 100 interacts with the network through the SIM card to implement functions such as communication and data communication. In some embodiments, the electronic device 100 employs esims, namely: an embedded SIM card. The eSIM card can be embedded in the electronic device 100 and cannot be separated from the electronic device 100.

In order to improve the power efficiency of the electronic device and prolong the endurance time of the electronic device, some manufacturers have started to use a buck-boost converter capable of automatically switching the operating mode to supply power to the camera in a power management module of a high-end electronic device in the prior art. Of course, the output end of the buck-boost converter is connected with other loads with the same working voltage range besides the camera, that is, the buck-boost converter can supply power to the camera and other loads.

Fig. 2 shows a schematic structural diagram of another electronic device. For example, as shown in fig. 2, in the electronic device 100, an input terminal of the buck-boost converter 1411 is electrically connected to the battery 142, and an output terminal is electrically connected to a plurality of loads having the same operating voltage range. The load includes at least one camera 193, and other loads, such as a radio frequency power amplifier and an antenna switch.

Based on the structure, when the buck-boost converter 1411 works, the voltage of the battery 142 is increased or decreased and is converted into the working voltage required by the load, so that the stable working voltage is provided for the load, and the normal work of the load is ensured.

The buck-boost converter 1411 has two operating modes, namely a PWM mode and a PFM mode, when operating. Thus, the step-up/down converter 1411 automatically switching the operation mode means that when the load connected to the step-up/down converter 1411 is light, that is, when the operation current of the load is detected to be small, the step-up/down converter 1411 is switched to the PFM mode; when the buck-boost converter 1411 is connected to a heavy load, i.e. when the working current of the load is detected to be large, the buck-boost converter 1411 will switch to the PWM mode. Compared with the PWM mode, the PFM mode has low current and low power consumption, so the buck-boost converter 1411 can achieve the purpose of reducing power consumption and improving power efficiency by automatically switching the operating mode.

It should be noted that the PWM mode adjusts the duty ratio through voltage feedback under the condition that the output frequency of the control circuit is not changed, so as to achieve the purpose of stabilizing the output voltage, and the frequency of the PFM mode modulation signal changes with the amplitude of the input signal, and the duty ratio is not changed. Fig. 3 shows a timing diagram of a PWM mode and a PFM mode. As shown in fig. 3, the PWM mode is to control the voltage output using the pulse width; the PFM mode controls voltage output by using the presence or absence of a pulse.

When the buck-boost converter 1411 is operated, the output current in the PFM mode is smaller than that in the PWM mode, and the buck-boost converter controlled by the PFM stops operating when the output current reaches a set voltage or higher, so the current consumption becomes smaller, and the efficiency at low load can be improved due to the reduction of the current consumption, so that the boost-buck converter 1411 can be switched to the PFM mode when the load is light, thereby improving the operating efficiency of the power supply.

Fig. 4 shows a circuit schematic of a buck-boost converter. Illustratively, as shown in fig. 4, the buck-boost converter 1411 mainly includes a control logic sub-circuit, two power MOS transistors (T1 and T2 shown in fig. 4) and an error amplifier, an inductor L, an output capacitor C, a feedback resistor R1 and a feedback resistor R2.

When the control logic subcircuit controls the switch T1 to be turned on and the switch T2 to be turned off, the input voltage flows through the inductor L, the load is supplied with power through the inductor L, and the power is stored in the inductor L and the output capacitor C. After a certain time, the control logic sub-circuit controls the switch T1 to be turned off and the switch T2 to be turned on, and the current in the holding circuit is kept unchanged due to the self-inductance of the inductor L, and the output capacitor C is continuously charged, so that the buck-boost converter 1411 achieves the purpose of boosting or reducing voltage.

Based on this principle, taking the input voltage higher than the output voltage as an example, when the load current is large, the control logic sub-circuit switches to the PWM mode, and at this time, the comparison threshold of the error amplifier becomes narrow. Therefore, the output voltage can reach the comparison threshold of the error amplifier as long as small fluctuation exists, so that the switching frequency is high, and the power supply ripple generated by the buck-boost converter is small. When the switching frequency is higher than a sensitive frequency point (for example, about 300 kHz) of the camera to which the buck-boost converter is connected, the ripple generated by the buck-boost converter has very little interference to the camera, and therefore, the shooting effect of the camera cannot be affected.

When the load current is small, if the control logic sub-circuit is switched to the PFM mode to improve the working efficiency of the power supply, the comparison threshold of the error amplifier is widened. Therefore, the output voltage must be lower or higher to reach the comparison threshold of the error amplifier, so that the switching frequency becomes lower, the loss becomes smaller, the efficiency is improved, and the ripple generated by the buck-boost converter is larger. When the switching frequency is lower than the sensitive frequency point of the camera connected with the buck-boost converter, the power supply ripple generated by the buck-boost converter greatly interferes with the camera, and the shooting effect of the camera is affected, for example, in dark light, dark stripes are easily generated during shooting.

It should be noted that, since loads such as the rf power amplifier and the antenna switch electrically connected to the buck-boost converter 1411 are in a standby state most of the time, and the requirement for the power supply ripple is relatively low, the switching of the buck-boost converter 1411 to the PFM mode does not greatly affect the loads such as the rf power amplifier and the antenna switch, but the camera 193 has a relatively high requirement for the power supply ripple, so that when the buck-boost converter is switched to the PFM mode, compared to the PWM mode, and the switching frequency is close to the sensitive frequency point of the camera 193, the interference energy generated by the buck-boost converter 1411 is relatively high, and the influence on the imaging effect of the camera 193 is not negligible.

To solve the effect of the power supply ripple generated by the buck-boost converter 1411, the prior art manufacturers add an LDO between the buck-boost converter and the camera.

Fig. 5 shows a schematic structural diagram of another electronic device. As shown in fig. 5, an input terminal of the LDO is electrically connected to an output terminal of the buck-boost converter 1411, and an output terminal of the LDO is electrically connected to the plurality of cameras 193. The LDO can further regulate the voltage output by the buck-boost converter, and can also filter out power supply ripples generated by the buck-boost converter 1411. Therefore, by adding the LDO between the buck-boost converter 1411 and the camera 193, the power ripple generated by the buck-boost converter can be suppressed by the LDO, and the influence of the power ripple on the camera shooting effect can be reduced.

It should be noted that fig. 6 shows a circuit schematic diagram of an LDO. Illustratively, as shown in fig. 6, the LDO mainly includes a power MOS transistor (T3 shown in fig. 6) and an error amplifier, a feedback resistor R3, and a feedback resistor R4.

When the input voltage of the LDO changes, that is, when the output voltage of the buck-boost converter electrically connected with the LDO generates ripples, the LDO compares the output voltage acquired through the feedback resistors R3 and R4 with a preset reference voltage, and then controls the voltage difference between the drain and the source of the T3 by controlling the voltage difference between the source and the gate of the T3 through the error amplifier, so as to keep the output voltage stable and unchanged, and thus, the purpose of suppressing the power supply ripples is achieved.

However, when the Power Supply ripple Rejection Ratio (PSRR) of the LDO is poor, that is, the LDO has poor capability of suppressing the Power Supply ripple, the Power Supply ripple of the buck-boost converter in the PFM mode cannot be suppressed, and the camera is prone to generating dark stripes in dark light, which affects the shooting effect of the camera.

In order to solve the above problem, an embodiment of the present application provides an electronic device, when at least one camera works, by enabling a buck-boost converter to work in a pulse width modulation mode, because a power ripple in the pulse width modulation mode is small, an influence of the power ripple generated by the buck-boost converter on the camera can be eliminated, and therefore the problem that a camera shoots a dark stripe under dark light is solved.

Embodiments of the present application will be described in detail below with reference to the accompanying drawings.

The embodiment of the application provides an electronic device, wherein the electronic device may be a mobile phone, a tablet computer, a wearable device, an in-vehicle device, an Augmented Reality (AR)/Virtual Reality (VR) device, a notebook computer, a super-mobile personal computer (UMPC), a netbook, a Personal Digital Assistant (PDA), and the like. The electronic device may also be other terminal devices having data processing functions. The embodiment of the present application does not set any limit to the specific type of the electronic device.

Fig. 7 shows a schematic structural diagram of an electronic device provided in an embodiment of the present application. As shown in fig. 7, the electronic apparatus includes: the buck-boost converter 1411, the mode control module 1413, the low dropout linear regulator 1412, and a plurality of loads including the at least one camera 193 and loads other than the at least one camera.

In conjunction with fig. 7, the other loads may be a radio frequency power amplifier, an antenna switch, and the like.

The buck-boost converter 1411 is electrically connected with the mode control module 1413, the low dropout regulator 1412 and other loads respectively; the buck-boost converter 1411 is used to generate operating voltages for a plurality of loads.

It is understood that the operating voltages of the plurality of loads should be in the same range, and thus, the buck-boost converter 1411 can simultaneously provide a stable voltage for the loads having the same operating voltage range.

The low dropout regulator 1412 is further electrically connected to the at least one camera 193, and the low dropout regulator 1412 is configured to reduce a ripple of the operating voltage provided by the buck-boost converter 1411 to the at least one camera 193.

It can be understood that, with reference to fig. 7, since other loads such as the rf power amplifier and the antenna switch are in a standby state most of the time and have low power ripple requirements, the rf power amplifier and the antenna switch can be directly electrically connected to the buck-boost converter 1411, so that the buck-boost converter 1411 can directly provide the operating voltage to the plurality of loads, but the camera 193 is sensitive to the power ripple, and therefore, the low-dropout linear regulator 1412 is usually connected between the buck-boost converter 1411 and the camera 193 to reduce the power ripple output from the buck-boost converter 1412 to the camera 193. Of course, it is understood that in other embodiments, the buck-boost converter 1411 in the electronic device 100 may also be directly electrically connected to the camera 193.

The mode control module 1413 is configured to obtain operating states of a plurality of loads, the operating states including: at least one camera 193 is in a first state of operation, and a second state of no camera 193 is in operation.

It should be noted that the mode control module 1413 may directly or indirectly acquire the operating states of the multiple loads by acquiring the operating current of the loads, and the like, and the specific acquisition mode may be set according to needs, which is not particularly limited in this embodiment of the application.

The first state is a state in which one or more cameras are operating regardless of whether or not other loads are operating, and regardless of whether or not other loads are operating. The second state refers to a state in which the camera 193 is off, on standby, or not operating while other loads are operating.

When the working states of the plurality of loads are first states, namely when at least one camera works, the mode control module provides a first control signal for the buck-boost converter; the buck-boost converter is used for switching the working mode into the pulse width modulation mode under the control of the first control signal.

At this moment, no matter how many cameras work, as long as there are cameras working, force to make the buck-boost converter work in the PWM mode, the power ripple will be very small, even if the power ripple rejection capability of LDO is poor, or even if the buck-boost converter is directly electrically connected with the cameras, the camera effect of the cameras will not be affected, thereby avoiding the camera from appearing dark stripes in dim light.

It should be noted that the first control signal may be a voltage signal, an electromagnetic induction signal, and the like, and this is not particularly limited in this application embodiment as long as the first control signal can control the buck-boost converter.

The embodiment of the application provides an electronic device, which comprises a buck-boost converter, a mode control module, a low dropout regulator and a plurality of loads, wherein the plurality of loads comprise at least one camera and other loads except the at least one camera. Based on this, when at least one camera is at the during operation, provide first control signal to the buck-boost converter through mode control module, make the buck-boost converter work in pulse width modulation mode, because the power ripple of pulse width modulation mode is less to can eliminate the influence of power ripple to the camera, solve the camera and shoot the problem that the dark stripe appears under the dim light.

Optionally, as a possible implementation manner, in conjunction with fig. 7, when the operating state of the plurality of loads is the second state, that is, when no camera operates, the mode control module provides the second control signal to the buck-boost converter; the buck-boost converter is used for automatically switching the working mode between the pulse width modulation mode and the pulse frequency modulation mode under the control of the second control signal.

At the moment, as long as no camera works, the influence of power supply ripples is not considered, so that the load connected with the buck-boost converter is judged to be light or heavy only according to the magnitude of the load working current, the buck-boost converter automatically switches the working mode to the PWM mode when the load is heavy, and the buck-boost converter automatically switches the working mode to the PFM mode when the load is light, so that the power consumption is reduced, and the cruising ability of the electronic equipment is prolonged.

It should be noted that the second control signal may be a voltage signal, an electromagnetic induction signal, and the like, and this is not particularly limited in this application embodiment as long as the second control signal can control the buck-boost converter.

Because this application embodiment still does not have under the condition of camera work, provides the second control signal through mode control module to the step-up and step-down converter, makes the work module of step-up and step-down converter can be in the automatic switch-over between pulse width modulation mode and pulse frequency modulation mode, can realize reducing the power consumption, improve the purpose of power efficiency.

Optionally, as a possible implementation manner, fig. 8 illustrates a schematic structural diagram of another electronic device provided in the embodiment of the present application. As shown in fig. 8, the electronic device 100 further includes a battery 142, the battery 142 is electrically connected to a buck-boost converter 1411, and the buck-boost converter 1411 is configured to convert a voltage of the battery 142 into an operating voltage of a plurality of loads.

The battery may be a battery inside the electronic device or a battery outside the electronic device.

Optionally, as a possible implementation manner, fig. 9 shows a schematic structural diagram of another electronic device provided in the embodiment of the present application. As shown in fig. 9, the electronic device 100 further includes: the buck-boost converter 1411 includes an enable terminal EN and a MODE selection terminal MODE for providing an enable signal to the enable control terminal Vp.

The enable terminal EN is electrically connected to the enable control terminal Vp, the enable control terminal Vp provides an enable signal to the enable terminal EN of the buck-boost converter 1411, and the buck-boost converter 1411 is configured to start operating under control of the enable signal, that is, start converting the voltage of the battery into the operating voltages of the plurality of loads.

The MODE control module 1413 is electrically connected to the MODE selection terminal MODE.

It should be noted that, in the implementation process, the buck-boost converter 1411 is usually implemented by a buck-boost converter chip, at this time, the buck-boost converter 1411 includes a plurality of ports with different functions, where, usually, the buck-boost converter 1411 has an enable terminal EN and a MODE selection terminal MODE, the enable terminal is used to control the buck-boost converter to start operating, and the MODE selection terminal is used to switch the buck-boost converter 1411 to an operating MODE.

The enable control terminal Vp for providing a signal to the enable terminal EN may be any high level terminal in the electronic device 100, and outputs a constant high level. For example, the enable control terminal Vp may be an output terminal of a battery, at this time, the battery will pull up the enable terminal, so that the buck-boost converter 1411 starts to operate, or the enable control terminal Vp may be an output terminal of a power supply in the power management module, in this way, after the electronic device 100 is powered on, the power supply will pull up the enable terminal EN so that the buck-boost converter 1411 starts to operate, and after the electronic device 100 is powered off, the enable terminal EN may be pulled up according to a preset interval duration so that the buck-boost converter 1411 operates intermittently, so as to reduce power consumption of the electronic device 100 when the electronic device is powered off.

When the operation states of the plurality of loads are the first state, that is, when at least one camera 193 operates, the MODE control module 1413 provides a first control signal to the MODE selection terminal MODE of the buck-boost converter 1411, so that the buck-boost converter 1411 is configured to switch the operation MODE to the pulse width modulation MODE under the control of the first control signal.

When the operating states of the plurality of loads are the second state, that is, when the camera 193 does not operate, the MODE control module 1413 provides a second control signal to the MODE selection terminal MODE of the buck-boost converter 1411; thus, the buck-boost converter 1411 is configured to automatically switch the operating mode between the pulse width modulation mode and the pulse frequency modulation mode under the control of the second control signal.

It should be noted that, when at least one camera starts to work, no matter the load is light or heavy, the camera 193 is used as a priority target, and for the purpose of not affecting the photographing effect of the camera 193, the buck-boost converter 1411 is forcibly switched to the PWM MODE by providing the first control signal to the MODE selection terminal MODE, so that the power ripple is reduced although a little power consumption is sacrificed, and the camera 193 can photograph in a dark light without a dark stripe.

When the camera 193 does not work, the requirements of other loads on power supply ripples are not high, and at this time, according to the load weight, the second control signal is provided to the MODE selection end MODE, so that the buck-boost converter 1411 can be automatically switched between the PFM MODE and the PWM MODE, and power consumption can be reduced.

It should be noted that, for example, the first control signal may be a low-level signal or a ground level, and the second control signal may be a high-level signal. The terms "high" and "low" herein merely represent relative magnitude relationships between voltages.

Optionally, as a possible implementation manner, on the basis of fig. 9, fig. 10 shows a schematic structural diagram of another electronic device provided in the embodiment of the present application. As shown in fig. 10, the camera in the electronic device has a feedback voltage terminal V_IO Mode control module 1413 and feedback voltage terminal V of camera 193_IOElectrically connecting;

wherein, when the electronic device 100 comprises a plurality of cameras 193, each of the plurality of cameras 193 has a feedback voltage terminal V_IOFeedback voltage terminals of a plurality of cameras 193V_IOAre electrically connected to the mode control module 1413.

When the operation state is the first state, i.e. when at least one camera 193 is operating, the mode control module 1413 is configured to output the feedback voltage from the feedback voltage terminal V_IOGenerating a first control signal under the control of the provided first voltage, and then providing the first control signal to a MODE selection terminal MODE of the buck-boost converter 1411;

the mode control module 1413 is also used to control the output voltage from the feedback voltage terminal V when the operating state is the second state, i.e., when the camera 193 is not operating_IOThe second control signal is generated under the control of the supplied second voltage, and then the second control signal is supplied to the MODE selection terminal MODE of the buck-boost converter 1411.

It should be noted that the mode selection module 1413 obtains the working condition of the camera 193 by directly connecting with the camera 193, so that the feedback voltage end V of the camera 193 can be connected to the feedback voltage end V_IOOutputs a first control signal or a second control signal according to the operation of the camera 193.

For example, the first voltage may be a high level, and the second voltage is a low level, that is, when at least one camera is in operation, the feedback voltage terminal V of the camera is at_IOA constant high voltage is output, and when no camera works, a feedback voltage end V of the camera_IOA constant low voltage is output.

Alternatively, the first voltage may be a low level, and the second voltage is a high level, that is, when at least one camera operates, the feedback voltage terminal V of the camera_IOOutputting constant low voltage, when there is no camera working, the feedback voltage end V of the camera_IOA constant high voltage is output.

Alternatively, as a possible implementation manner, as shown in fig. 10, the mode control module 1413 in the electronic device 100 includes a first transistor T11 and a first resistor R11;

the gate G and the feedback voltage terminal V of the first transistor T11_IOElectrically connected, the first pole of the first transistor T11 is electrically connected to the ground GND, the second pole of the first transistor T11 is electrically connected to the modeThe select terminal MODE is electrically connected.

A first terminal of the first resistor R11 is electrically connected to the MODE selection terminal MODE, and a second terminal of the first resistor R11 is electrically connected to the enable control terminal Vp.

In contrast to the mode control module shown in fig. 9, when the mode control module includes the first transistor T11 and the first resistor R11, the first transistor T11 can be at the feedback voltage terminal V_IOIs turned on or off under the control of the switch, and plays a role of a switch. The first resistor R11 functions as a protection circuit.

It should be noted that the mode control module may further include a plurality of switching transistors connected in parallel with the first transistor T11, and/or a plurality of resistors connected in parallel with the first resistor R11. The above is merely an example of the mode control module, and other structures having the same function as the mode control module are not described in detail here, but all of them should fall into the protection scope of the present application.

Based on the above, it should be further noted that the first transistor T11 may be of an N-type or a P-type, and the first pole may be a drain, the second pole may be a source, or the first pole may be a source, and the second pole may be a drain. In addition, the first transistor may be an enhancement transistor or a depletion transistor depending on the conduction manner of the transistor. The specific form of the first transistor T11 may be set as needed, and the present application is not particularly limited in this regard.

Illustratively, referring to fig. 9, the first transistor T11 is an N-channel enhancement MOSFET, and has a first terminal electrically connected to the ground GND and a second terminal electrically connected to the MODE selection terminal MODE.

Optionally, as a possible implementation manner, on the basis of fig. 9, fig. 11 shows a schematic structural diagram of another electronic device provided in the embodiment of the present application. As shown in fig. 11, the electronic apparatus further includes: the mode control module 1413 is electrically connected to the general input output interface of the processor 110.

When the operating state is the first state, that is, when at least one camera 193 operates, the MODE control module 1413 is configured to generate a first control signal under the control of the third voltage from the gpio interface, and then transmit the first control signal to the MODE selection terminal MODE of the buck-boost converter 1411.

When the operating state is the second state, that is, when the camera 193 is not operating, the MODE control module 1413 is configured to generate a second control signal under the control of the fourth voltage from the gpio interface, and then transmit the second control signal to the MODE selection terminal MODE of the buck-boost converter 1411.

It should be noted that the processor 110 may determine the operating status of each load by reading the application status and flag status corresponding to the load or by retrieving the opened log file, and of course, the operating status of each camera is also included, and meanwhile, the processor 110 is also connected to the mode control module 1413, so as to control the output of the mode control module 1413 after the operating status of the camera 193 is confirmed. Based on this, the mode control module 1413 outputs the first control signal or the second control signal according to the working condition of the camera 193 under the control of the GPIO interface of the processor.

For example, the third voltage may be a high level, and the fourth voltage may be a low level, that is, when at least one camera is operated, the GPIO interface of the processor outputs a constant high voltage, and when no camera is operated, the GPIO interface of the processor outputs a constant low voltage.

Or, the third voltage may be a low level, and the fourth voltage is a high level, that is, when at least one camera operates, the GPIO interface of the processor outputs a constant low voltage, and when no camera operates, the GPIO interface of the processor outputs a constant high voltage.

Optionally, as a possible implementation manner, with reference to fig. 11, when the operating state is the first state, that is, when at least one camera 193 is operating, the processor 110 is further configured to determine a gain and an exposure time at the camera 193, and transmit the third voltage to the GPIO interface when the gain and the exposure time meet preset conditions, so that the MODE control module 1413 outputs the first control signal to the MODE selection terminal MODE under the control of the third voltage from the GPIO interface.

Otherwise, when the gain and the exposure time do not satisfy the preset conditions, even if the camera is working, the fourth voltage is transmitted to the GPIO interface, so that the MODE control module 1413 outputs the second control signal to the MODE selection terminal MODE under the control of the fourth voltage from the GPIO interface.

Here, information such as gain and exposure time of the camera 193 can be set in advance by an Auto Exposure (AE) module of the ISP. The specific parameters may be set as required, and the present application is not limited to this.

It can be understood that when the gain and the exposure time satisfy the preset conditions, it indicates that the camera 193 is in a dark environment under certain conditions, and at this time, the working mode of the buck-boost converter 1411 has a large influence on the photographing effect of the camera 193, so that the processor 110 needs to provide a third voltage to the GPIO interface to prompt the mode control module 1413 to have a camera that is working in a dark environment. When the gain and the exposure time do not satisfy the preset conditions, it indicates that the environment where the camera 193 is located has little influence on the shooting effect, and it is not necessary to force the buck-boost converter 1411 to operate in the PWM mode. At this time, it is equivalent to have a preliminary screening for the shooting environment, and more precise control is made on whether the mode of the buck-boost converter 1411 needs to be changed.

Optionally, as a possible implementation manner, as shown in fig. 11, the mode control module includes a second resistor R12, a third resistor R13;

the first end of the second resistor R12 is electrically connected to the GPIO interface, and the second end of the second resistor R12 is electrically connected to the MODE selection terminal MODE.

A first terminal of the third resistor R13 is electrically connected to the MODE selection terminal MODE, and a second terminal of the third resistor R13 is electrically connected to the enable control terminal Vp.

The second resistor R12 and the third resistor R13 may function as a protection circuit, and here, the resistance of the second resistor R12 may also be approximately zero.

It should be noted that the mode control module 1413 may further include a plurality of resistors connected in parallel with the second resistor R12 and/or a plurality of resistors connected in parallel with the third resistor R13. The above is merely an illustration of the mode control module 1413, and other structures having the same functions as the mode control module 1413 are not described in detail here, but all shall fall within the scope of the present application.

It should be further noted that the mode control module 1413 may also be electrically connected to other loads to obtain the operating conditions of the other loads, or the mode control module 1413 may be electrically connected to the processor, and the processor 110 may be electrically connected to the other loads to determine the operating conditions of the other loads and then transmit the operating conditions to the mode control module 1413. The specific connection mode, the specific acquisition mode, and the specific acquisition data may be set as needed, and this is not particularly limited in this application.

It is to be understood that the illustrated structure of the embodiment of the present application does not specifically limit the electronic device 100. In other embodiments of the present application, electronic device 100 may include more or fewer components than shown, or some components may be combined, some components may be split, or a different arrangement of components. The illustrated components may be implemented in hardware, software, or a combination of software and hardware.

In practical applications, the buck-boost converter is usually implemented by a chip. The following will exemplify a chip corresponding to the step-up/step-down converter.

Fig. 12 shows a schematic diagram of a chip structure corresponding to the buck-boost converter. As shown in fig. 12, the buck-boost converter has a voltage input terminal Vin, a voltage output terminal Vout, a switching signal terminal LX1, a switching signal terminal LX2, a feedback terminal FB, and a ground terminal in addition to an enable terminal EN and a MODE selection terminal MODE.

An inductor L is connected between the switching signal end LX1 and the switching signal end LX2, and a voltage-dividing resistor is connected between the voltage output end and the ground level at the feedback end FB to control the output voltage.

Referring to fig. 12, when the input voltage is higher than the output voltage, the buck-boost converter is equivalent to being used for buck. In this case, the first stage is: switches S1 and S4 are closed, switches S2 and S3 are open, inductor L charges, and the second phase is: switches S2 and S3 are closed, switches S1 and S4 are open, and inductor L discharges. The first stage and the second stage are repeated, whereby the buck-boost converter can convert the input voltage to the output voltage.

When the input voltage is lower than the output voltage, the buck-boost converter is equivalent to boosting. In this case, the first stage is: switches S1 and S3 are closed, switches S2 and S4 are open, inductor L charges, and the second phase is: switches S1 and S4 are closed, switches S2 and S3 are open, and inductor L discharges. The first stage and the second stage are repeated, whereby the input voltage can be converted into the output voltage.

On the basis of fig. 12, fig. 13 shows a structural schematic diagram of a chip corresponding to another buck-boost converter. The buck-boost converter comprises a plurality of voltage input ends, a plurality of voltage output ends, a plurality of switch signal ends LX1, a plurality of switch signal ends LX2, a feedback end FB and a plurality of grounding ends besides an enable end EN and a MODE selection end MODE, and also comprises a plurality of capacitors. The operation principle of the chip is basically the same as that of the chip shown in fig. 12, and the description thereof is omitted.

On the basis, the embodiment of the application also provides a control method applied to the electronic equipment. The following describes in detail the control method corresponding to the electronic device shown in fig. 10 and 11, with reference to the chip structure corresponding to the step-up/step-down converter shown in fig. 13.

Fig. 14 is a connection diagram of the mode control module and the buck-boost converter shown in fig. 10, and fig. 15 is a connection diagram of the mode control module and the buck-boost converter shown in fig. 11.

Fig. 16 is a flowchart illustrating a control method of an electronic device, where, as shown in fig. 16, the electronic device includes: the buck-boost converter 1411, the mode control module 1413, the low dropout regulator 1412, and a plurality of loads including the at least one camera 193 and other loads except the at least one camera, the control method of the electronic device includes the following S10 to S40.

And S10, generating working voltages of a plurality of loads by the buck-boost converter.

When the electronic device further comprises a battery, the buck-boost converter is electrically connected with the battery, and at the moment, the buck-boost converter is used for converting the voltage of the battery into the working voltages of the plurality of loads.

And S20, the low dropout regulator reduces the ripple of the working voltage provided by the buck-boost converter for the at least one camera.

S30, when the working state is the first state, namely when at least one camera works, the mode control module provides a first control signal for the buck-boost converter; under the control of the first control signal, the buck-boost converter switches the working mode into the pulse width modulation mode.

The embodiment of the application provides a control method of electronic equipment, when at least one camera works in a load, a first control signal is provided for a buck-boost converter through a mode control module, so that the buck-boost converter works in a pulse width modulation mode, and because a power supply ripple wave of the pulse width modulation mode is small, the influence of the power supply ripple wave on the camera can be eliminated, and the problem that dark stripes appear when the camera shoots in dark light is solved.

Optionally, as a possible implementation manner, as shown in fig. 16, the method further includes:

s40, when the working state is the second state, namely when no camera works, the mode control module provides a second control signal for the buck-boost converter; and under the control of the second control signal, the buck-boost converter automatically switches the working mode between the pulse width modulation mode and the pulse frequency modulation mode.

Because the embodiment of the application also provides the second control signal for the buck-boost converter through the mode control module under other conditions without the working of the camera, the buck-boost converter can be automatically switched between the pulse width modulation mode and the pulse frequency modulation mode, and the purposes of reducing power consumption and improving power efficiency are achieved.

Optionally, as a possible implementation manner, as shown in fig. 14 and fig. 15, when the electronic device further includes an enable control terminal Vp for providing an enable signal, and the buck-boost converter includes an enable terminal EN and a MODE selection terminal MODE, the above S10 includes:

the enabling control end provides an enabling signal for the enabling end of the buck-boost converter, and the buck-boost converter starts to work under the control of the enabling signal.

The S30 includes:

when the working state is the first state, namely when at least one camera works, the mode control module provides a first control signal to the mode selection end of the buck-boost converter, so that the buck-boost converter can be switched to the pulse width modulation mode under the control of the first control signal.

The S40 includes:

when the working state is the second state, namely when no camera works, the mode control module provides a second control signal to the mode selection end of the buck-boost converter, so that the buck-boost converter can be automatically switched between the pulse width modulation mode and the pulse frequency modulation mode under the control of the second control signal.

Because the buck-boost converter usually has an enable end and a mode selection end, therefore, a signal can be provided to the enable end EN so that the buck-boost converter starts to load the working voltage of the voltage converter of the battery.

When the camera does not work, the second control signal is provided for the mode selection end of the buck-boost converter, so that the buck-boost converter can be automatically switched between a pulse width modulation mode and a pulse frequency modulation mode, and the purposes of reducing power consumption and improving power efficiency are achieved.

Alternatively, as a possible implementation manner, in conjunction with fig. 14, when the camera 193 in the electronic device 100 has the feedback voltage terminal V_IO Mode control module 1413 and feedback voltage terminal V of camera 193_IOElectric connectionThen, S30 includes:

at a voltage terminal V from the feedback_IOThe mode control module 1413 provides a first control signal to a mode select terminal of the buck-boost converter 1411 under control of the first voltage.

The S40 includes:

at a voltage terminal V from the feedback_IOThe mode control module 1413 provides a second control signal to the mode select terminal of the buck-boost converter 1411 under control of the second voltage.

Alternatively, as a possible implementation manner, in conjunction with fig. 14, when the mode control module 1413 includes the first transistor T11 and the first resistor R11, the voltage at the terminal V from the feedback voltage is measured_IOUnder the control of the voltage of (1), the MODE control module 1413 provides a first control signal to the MODE selection terminal MODE of the buck-boost converter 1411, including:

feedback voltage terminal V_IOWhen the first voltage is transmitted to the gate G of the first transistor T11 to turn on the first transistor T11, the ground level at the ground terminal GND is provided as a first control signal to the MODE selection terminal MODE of the buck-boost converter 1411.

At a voltage terminal V from the feedback_IOUnder the control of the second voltage, the MODE control module 1413 provides a second control signal to the MODE selection terminal MODE of the buck-boost converter 1411, including:

feedback voltage terminal V_IOThe second voltage is transmitted to the gate G of the first transistor T11 to turn off the first transistor T11, and the enable signal of the enable signal terminal EN is provided as the second control signal to the mode selection terminal of the buck-boost converter 1411.

It should be noted that, when the resistance of the first resistor R11 is small, it can be ignored, the enable signal is used as the second control signal to be transmitted to the MODE selection terminal MODE, and when the resistance of the first resistor R11 is large, the enable signal is divided by the first resistor R11 and then is used as the second control signal to be transmitted to the MODE selection terminal MODE.

For example, referring to fig. 14, if the first transistor T11 in the MODE selection module 1413 is an N-channel enhancement MOSFET, the first electrode is electrically connected to the source terminal GND, the second electrode is electrically connected to the drain terminal MODE, the resistance of the first resistor R11 is 100k Ω, and the enable signal at the enable control terminal Vp is at a high level.

Based on this, when at least one camera 193 works, the working camera 193 will feed back the voltage end V_IOIf the gate G of the first transistor T11 is provided with a high level, the first transistor T11 will be turned on, the ground level connected to the source of the first transistor T11 will be transmitted to the MODE selection terminal MODE, and at this time, the MODE selection terminal MODE will be pulled to the ground level, and the buck-boost converter 1411 will be forced to operate in the PWM MODE. The switching frequency of the PWM mode is assumed to be 2MHz, so that the sensitive frequency band of the camera 193 can be avoided, and the problem of dark stripes is solved.

When no camera 193 operates, all the feedback voltage terminals V of the camera 193_IOThe low level is provided for the gate G of the first transistor T11, the first transistor T11 is turned off, at this time, the MODE selection terminal MODE is pulled up to the enable control terminal Vp through the first resistor R11, the MODE selection terminal MODE inputs the high level, and the buck-boost converter 1411 automatically switches between the pulse width modulation MODE and the pulse frequency modulation MODE, so that the purposes of improving the power supply efficiency and prolonging the endurance time of the mobile phone are achieved.

Optionally, as a possible implementation manner, in conjunction with fig. 15, when the electronic device 100 further includes a processor 110 with a general input/output interface; when the mode control module 1413 is electrically connected to the gpio interface, S30 includes:

the MODE control module 1413 provides a first control signal to the MODE selection terminal MODE of the buck-boost converter 1411 under control of the third voltage from the gpio interface.

The S40 includes:

and under the control of the fourth voltage from the universal input/output interface, the mode control module provides a second control signal to the mode selection end of the buck-boost converter.

Optionally, as a possible implementation manner, with reference to fig. 15, before the mode control module provides the first control signal to the mode selection terminal of the buck-boost converter under the control of the third voltage from the general input/output interface, the method further includes:

the processor determines the gain and exposure time of the camera.

When the gain and the exposure time of the camera meet preset conditions, the processor provides a third voltage for the general input/output interface; otherwise, the fourth voltage is provided to the general input output interface.

For example, as shown in fig. 15, if the resistance of the second resistor R12 is 0 Ω, and the resistance of the third resistor R13 is 100k Ω, the enable control terminal Vp is at a high level.

Based on this, when there is at least one camera 193 operating, the processor 110 determines that there is the camera 193 operating, and provides a low level to the GPIO interface, then under the control of the low level from the GPIO interface, the MODE selection terminal MODE will be pulled low, and the buck-boost converter 1411 will be forced to operate in the PWM MODE. The switching frequency of the PWM mode is assumed to be 2MHz, so that the sensitive frequency band of the camera 193 can be avoided, and the problem of dark stripes is solved.

Here, the processor 110 may first determine whether the gain and the exposure time of the camera satisfy preset conditions, and if so, provide a low level to the GPIO interface, and if not, provide a high level to the GPIO interface.

When the camera 193 does not work, the processor 110 provides a high level for the GPIO interface, the MODE selection terminal MODE is pulled high, and the buck-boost converter 1411 automatically switches between the pulse width modulation MODE and the pulse frequency modulation MODE, so as to achieve the purposes of improving the power efficiency and prolonging the endurance time of the mobile phone.

It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.

Finally, it should be noted that: the above description is only an embodiment of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions within the technical scope of the present disclosure should be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. An electronic device, comprising: the device comprises a buck-boost converter, a mode control module, a low dropout linear regulator and a plurality of loads, wherein the plurality of loads comprise at least one camera and other loads except the at least one camera;

the buck-boost converter is electrically connected with the mode control module, the low dropout regulator and the other loads respectively; the buck-boost converter is used for generating working voltages of the plurality of loads;

the low dropout regulator is also electrically connected with the at least one camera and is used for reducing ripples of the working voltage provided by the buck-boost converter for the at least one camera;

the mode control module is configured to obtain operating states of the plurality of loads, where the operating states include: the at least one camera is in a first working state, and a second state without the camera working;

when the working state is a first state, the mode control module provides a first control signal for the buck-boost converter; the buck-boost converter is used for switching a working mode into a pulse width modulation mode under the control of the first control signal.

2. The electronic device of claim 1, further comprising:

when the working state is a second state, the mode control module provides a second control signal for the buck-boost converter; the buck-boost converter is used for automatically switching the working mode between the pulse width modulation mode and the pulse frequency modulation mode under the control of the second control signal.

3. The electronic device of claim 2, further comprising an enable control terminal for providing an enable signal, wherein the buck-boost converter comprises an enable terminal and a mode selection terminal;

the enable control end is electrically connected with the enable end, the enable control end provides an enable signal to the enable end of the buck-boost converter, and the buck-boost converter is used for starting to work under the control of the enable signal;

the mode control module is electrically connected with the mode selection end;

when the working state is a first state, the mode control module provides the first control signal to the mode selection end of the buck-boost converter;

and when the working state is a second state, the mode control module provides the second control signal to the mode selection end of the buck-boost converter.

4. The electronic device of claim 3, wherein the at least one camera has a feedback voltage terminal, and the mode control module is electrically connected to the feedback voltage terminal of the at least one camera;

when the working state is a first state, the mode control module is used for generating the first control signal under the control of a first voltage provided by the feedback voltage end;

and when the working state is a second state, the mode control module is further used for generating the second control signal under the control of a second voltage provided by the feedback voltage end.

5. The electronic device of claim 4, wherein the mode control module comprises a first transistor and a first resistor;

a gate of the first transistor is electrically connected to the feedback voltage terminal, a first electrode of the first transistor is electrically connected to a ground terminal, and a second electrode of the first transistor is electrically connected to the mode selection terminal;

the first end of the first resistor is electrically connected with the mode selection end, and the second end of the first resistor is electrically connected with the enable control end.

6. The electronic device of claim 3, further comprising a processor having a general purpose input output interface; the mode control module is electrically connected with the universal input/output interface;

when the working state is a first state, the mode control module is used for generating the first control signal under the control of a third voltage from the general input/output interface;

and when the working state is a second state, the mode control module is used for generating the second control signal under the control of a fourth voltage from the general input/output interface.

7. The electronic device of claim 6, wherein when the operating state is a first state, the processor is further configured to determine a gain and an exposure time of a camera, and when the gain and the exposure time satisfy a preset condition, provide the third voltage to the GPIO interface.

8. The electronic device of claim 6 or 7, wherein the mode control module comprises a second resistor and a third resistor;

the first end of the second resistor is electrically connected with the general input/output interface, and the second end of the second resistor is electrically connected with the mode selection end;

the first end of the third resistor is electrically connected with the mode selection end, and the second end of the third resistor is electrically connected with the enable control end.