electronic devices

Abstract

This application provides an electronic device comprising: a buck-boost converter, a mode control module, a low-dropout linear regulator, and multiple loads, including at least one camera and other loads besides the at least one camera; the mode control module is used to acquire the operating states of the multiple loads, including: a first state where at least one camera is operating, and a second state where no camera is operating; when the operating state is the first state, the mode control module provides a first control signal to the buck-boost converter; the buck-boost converter is used to switch its operating mode to pulse width modulation (PWM) mode under the control of the first control signal. Because the power ripple of PWM mode is smaller, the influence of power ripple on the camera can be eliminated, solving the problem of dark stripes appearing when the camera is shooting in low light.

Description

[0001] This application is a divisional application of Chinese patent application filed on September 15, 2020, with application number 202010970738.6 and title "Electronic Device". Technical Field

[0002] This application relates to the field of electronics, and more particularly to an electronic device. Background Technology

[0003] As people's demands for functions such as photography increase, the number of cameras installed in electronic devices is also increasing. While increasing the number of cameras can improve the shooting effect, it also leads to a sharp increase in the power consumption generated by the cameras; at the same time, as the pixel count of cameras becomes higher and higher, this will cause power consumption to increase further, thus severely shortening the battery life of electronic devices.

[0004] In existing technologies, to improve power efficiency and extend battery life in electronic devices, some manufacturers use buck-boost converters (Buckboost) in high-end electronic devices that can automatically switch operating modes to power cameras. Typically, buck-boost converters automatically switch between two modes: pulse width modulation (PWM) mode and pulse frequency modulation (PFM) mode. When fewer cameras are operating, the buck-boost converter switches to PFM mode; when more cameras are operating, it switches to PWM mode. This automatic switching of operating modes improves the power efficiency of the buck-boost converter.

[0005] However, because cameras are particularly sensitive to noise, the power ripple generated when the buck-boost converter switches to PFM mode is significant, severely impacting the camera's image quality. Therefore, manufacturers add a low-dropout regulator (LDO) between the buck-boost converter and the camera to filter out interference. However, when the LDO's power supply rejection ratio (PSRR) is poor, it can still easily cause dark stripes on the camera in low light, affecting image quality. Summary of the Invention

[0006] This application provides an electronic device that solves the problem of dark stripes appearing in cameras under low light conditions, thereby improving the shooting effect.

[0007] To achieve the above objectives, this application adopts the following technical solution:

[0008] In a first aspect, an electronic device is provided, comprising: a buck-boost converter, a mode control module, a low-dropout linear regulator, and multiple loads, the multiple loads including at least one camera and other loads besides the at least one camera; the buck-boost converter is electrically connected to the mode control module, the low-dropout linear regulator, and the other loads respectively; the buck-boost converter is used to generate operating voltages for the multiple loads; the low-dropout linear regulator is also electrically connected to at least one camera, and the low-dropout linear regulator is used to reduce the ripple of the operating voltage provided by the buck-boost converter to the at least one camera; the mode control module is used to acquire the operating states of the multiple loads, the operating states including: a first state in which at least one camera is operating, and a second state in which no camera is operating; when the operating state is the first state, the mode control module provides a first control signal to the buck-boost converter; the buck-boost converter is used to switch its operating mode to a pulse width modulation mode under the control of the first control signal.

[0009] The first aspect provides an electronic device including a buck-boost converter, a mode control module, a low-dropout linear regulator, and multiple loads, including at least one camera and other loads besides the at least one camera. Based on this, when at least one camera is operating, the mode control module provides a first control signal to the buck-boost converter, causing the buck-boost converter to operate in pulse width modulation (PWM) mode. Since PWM mode has lower power ripple, it can eliminate the influence of power ripple on the camera, thus solving the problem of dark stripes appearing when the camera is shooting in low light.

[0010] In conjunction with the first aspect, in one possible implementation of the first aspect, the electronic device further includes: when the operating state is the second state, a mode control module provides a second control signal to the buck-boost converter; the buck-boost converter is used to automatically switch its operating mode between pulse width modulation mode and pulse frequency modulation mode under the control of the second control signal. In this implementation, since the embodiment of this application provides a second control signal to the buck-boost converter through the mode control module to automatically switch the buck-boost converter between pulse width modulation mode and pulse frequency modulation mode when the camera is not working, the purpose of reducing power consumption and improving power efficiency can be achieved.

[0011] In conjunction with the first aspect, in one possible implementation of the first aspect, the electronic device further includes an enable control terminal for providing an enable signal. The buck-boost converter includes an enable terminal and a mode selection terminal. The enable control terminal is electrically connected to the enable terminal and provides an enable signal to the enable terminal of the buck-boost converter. The buck-boost converter is used to start operating under the control of the enable signal. A mode control module is electrically connected to the mode selection terminal. When the operating state is a first state, the mode control module provides a first control signal to the mode selection terminal of the buck-boost converter. When the operating state is a second state, the mode control module provides a second control signal to the mode selection terminal of the buck-boost converter. In this implementation, the buck-boost converter starts operating by providing an enable signal to the enable terminal, and the operating mode of the buck-boost converter is controlled by providing either the first or second control signal to the mode selection terminal.

[0012] In conjunction with the first aspect, in one possible implementation, at least one camera has a feedback voltage terminal, and a mode control module is electrically connected to the feedback voltage terminal of the at least one camera. In a first operating state, the mode control module generates a first control signal under the control of a first voltage provided from the feedback voltage terminal. In a second operating state, the mode control module further generates a second control signal under the control of a second voltage provided from the feedback voltage terminal. In this implementation, the mode control module obtains the operating state of the camera through electrical connection to the camera's feedback voltage terminal, and then outputs the first and second control signals based on whether the camera is operating.

[0013] In conjunction with the first aspect, in one possible implementation of the first aspect, the mode control module includes a first transistor and a first resistor; the gate of the first transistor is electrically connected to the feedback voltage terminal, the first terminal of the first transistor is electrically connected to the ground terminal, and the second terminal of the first transistor is electrically connected to the mode selection terminal; the first terminal of the first resistor is electrically connected to the mode selection terminal, and the second terminal of the first resistor is electrically connected to the enable control terminal. In this implementation, the mode control module obtains the operating status of the camera by being electrically connected to the feedback voltage terminal of the camera, and then controls the first transistor to be turned on and off according to whether the camera is working, thereby generating a first control signal and a second control signal.

[0014] In conjunction with the first aspect, in one possible implementation of the first aspect, the electronic device further includes a processor having a universal input / output interface (UIP); a mode control module is electrically connected to the UIP; in the first operating state, the mode control module generates a first control signal under the control of a third voltage from the UIP; in the second operating state, the mode control module generates a second control signal under the control of a fourth voltage from the UIP. In this implementation, the mode control module obtains the operating state of the camera through its electrical connection to the processor's UIP, and can then output the first or second control signal depending on whether the camera is operating.

[0015] In conjunction with the first aspect, in one possible implementation of the first aspect, when the operating state is the first state, the processor is also used to determine the camera's gain and exposure time. When the gain and exposure time meet preset conditions, a third voltage is provided to the general-purpose input / output interface. In this implementation, the processor first determines the camera's gain and exposure time to judge the camera's environment. Only when the preset conditions are met is it necessary to provide a third voltage through the general-purpose input / output interface to put the buck-boost converter into pulse width modulation mode.

[0016] In conjunction with the first aspect, in one possible implementation 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 to a general-purpose input / output interface, and the second end of the second resistor is electrically connected to a mode selection terminal; the first end of the third resistor is electrically connected to the mode selection terminal, and the second end of the third resistor is electrically connected to an enable control terminal.

[0017] Secondly, a control method for an electronic device is provided, applied to the aforementioned electronic device. The method includes: a buck-boost converter generating operating voltages for multiple loads; a low-dropout linear regulator reducing the ripple of the operating voltage provided by the buck-boost converter to at least one camera; when the operating state is a first state, a mode control module providing a first control signal to the buck-boost converter; and under the control of the first control signal, the buck-boost converter switching its operating mode to a pulse width modulation mode.

[0018] In conjunction with the second aspect, in one possible implementation of the second aspect, the method further includes: when the operating state is the second state, the mode control module provides a second control signal to the buck-boost converter; under the control of the second control signal, the buck-boost converter automatically switches the operating mode between pulse width modulation mode and pulse frequency modulation mode.

[0019] In conjunction with the second aspect, in one possible implementation of the second aspect, the buck-boost converter generating operating voltages for multiple loads includes: the enable control terminal providing an enable signal to the enable terminal of the buck-boost converter, and the buck-boost converter starting to operate under the control of the enable signal; when the operating state is a first state, the mode control module providing a first control signal to the buck-boost converter includes: when the operating state is a first state, the mode control module providing a first control signal to the mode selection terminal of the buck-boost converter; when the operating state is a second state, the mode control module providing a second control signal to the buck-boost converter includes: when the operating state is a second state, the mode control module providing a second control signal to the mode selection terminal of the buck-boost converter.

[0020] In conjunction with the second aspect, in one possible implementation of the second aspect, the mode control module provides a first control signal to the mode selection terminal of the buck-boost converter, including: under the control of a first voltage from the feedback voltage terminal, the mode control module provides the first control signal to the mode selection terminal of the buck-boost converter; the mode control module provides a second control signal to the mode selection terminal of the buck-boost converter, including: under the control of a second voltage from the feedback voltage terminal, the mode control module provides the second control signal to the mode selection terminal of the buck-boost converter.

[0021] In conjunction with the second aspect, in one possible implementation of the second aspect, under the control of a first voltage from the feedback voltage terminal, the mode control module provides a first control signal to the mode selection terminal of the buck-boost converter, including: the feedback voltage terminal transmitting the first voltage to the gate of the first transistor to turn on the first transistor, and the ground level of the ground terminal being provided as the first control signal to the mode selection terminal of the buck-boost converter; under the control of a second voltage from the feedback voltage terminal, the mode control module provides a second control signal to the mode selection terminal of the buck-boost converter, including: the feedback voltage terminal transmitting the second voltage to the gate of the first transistor to turn off the first transistor, and the enable signal of the enable signal terminal being provided as the second control signal to the mode selection terminal of the buck-boost converter.

[0022] In conjunction with the second aspect, in one possible implementation of the second aspect, the mode control module provides a first control signal to the mode selection terminal of the buck-boost converter, including: under the control of a third voltage from the general purpose input / output interface, the mode control module provides the first control signal to the mode selection terminal of the buck-boost converter; the mode control module provides a second control signal to the mode selection terminal of the buck-boost converter, including: under the control of a fourth voltage from the general purpose input / output interface, the mode control module provides the second control signal to the mode selection terminal of the buck-boost converter.

[0023] In conjunction with the second aspect, in one possible implementation of the second aspect, before the mode control module provides a first control signal to the mode selection terminal of the buck-boost converter under the control of a third voltage from the general-purpose input / output interface, the method further includes: the processor determining the gain and exposure time of the camera; and when the gain and exposure time of the camera meet preset conditions, the processor providing a third voltage to the general-purpose input / output interface.

[0024] It is understandable that the beneficial effects of the second aspect mentioned above can be found in the relevant descriptions in the first aspect mentioned above, and will not be repeated here. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application;

[0026] Figure 2 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application;

[0027] Figure 3 A timing diagram illustrating a PWM mode and a PFM mode provided for embodiments of this application;

[0028] Figure 4 A circuit schematic diagram of a buck-boost converter provided in this application embodiment;

[0029] Figure 5 This is a schematic diagram of the structure of another electronic device provided in an embodiment of this application;

[0030] Figure 6 A circuit diagram of an LDO provided in an embodiment of this application;

[0031] Figure 7 This is a schematic diagram of the structure of another electronic device provided in an embodiment of this application;

[0032] Figure 8 This is a schematic diagram of the structure of another electronic device provided in an embodiment of this application;

[0033] Figure 9 This is a schematic diagram of the structure of another electronic device provided in an embodiment of this application;

[0034] Figure 10 This is a schematic diagram of the structure of another electronic device provided in an embodiment of this application;

[0035] Figure 11 This is a schematic diagram of the structure of another electronic device provided in an embodiment of this application;

[0036] Figure 12 This is a schematic diagram of a chip structure corresponding to a buck-boost converter provided in an embodiment of this application;

[0037] Figure 13 This is a schematic diagram of the chip structure corresponding to another buck-boost converter provided in the embodiments of this application;

[0038] Figure 14 A connection diagram of a buck-boost converter and a mode control module provided in an embodiment of this application;

[0039] Figure 15 A connection diagram of another buck-boost converter and mode control module provided in an embodiment of this application;

[0040] Figure 16 This is a flowchart illustrating a control method for an electronic device provided in an embodiment of this application. Detailed Implementation

[0041] The technical solutions in this application will now be described with reference to the accompanying drawings.

[0042] In the description of this application, unless otherwise stated, " / " means "or," for example, A / B can mean A or B. The "and / or" in this document is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, and B alone. Furthermore, "at least one" means one or more, and "multiple" means two or more. The terms "first," "second," etc., do not limit the quantity or order of execution, and "first," "second," etc., do not necessarily imply differences.

[0043] It should be noted that, in this application, the terms "exemplary" or "for example" are used to indicate that something is being described as an example, illustration, or illustration. Any embodiment or design described as "exemplary" or "for example" in this application should not be construed as being more preferred or advantageous than other embodiments or design solutions. Specifically, the use of terms such as "exemplary" or "for example" is intended to present the relevant concepts in a concrete manner.

[0044] In the current technology, as people's demands for functions such as taking pictures increase, the number of cameras installed in electronic devices is also increasing. Although increasing the number of cameras can improve the picture quality, it also leads to a sharp increase in the power consumption generated by the cameras; at the same time, as the pixel count of cameras becomes higher and higher, this also leads to a further increase in power consumption, thus severely shortening the battery life of electronic devices.

[0045] For example, Figure 1A possible structural schematic diagram of electronic device 100 is shown. Electronic device 100 may include processor 110, external memory interface 120, internal memory 121, universal serial bus (USB) interface 130, charging management module 140, power management module 141, battery 142, antenna 1, antenna 2, mobile communication module 150, wireless communication module 160, audio module 170, speaker 170A, receiver 170B, microphone 170C, headphone jack 170D, sensor module 180, button 190, motor 191, indicator 192, camera 193, display screen 194, and subscriber identification module (SIM) card interface 195, etc. The sensor module 180 may include a pressure sensor 180A, a gyroscope sensor 180B, a barometric pressure sensor 180C, a magnetic sensor 180D, an accelerometer 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, etc.

[0046] Processor 110 may include one or more processing units, such as: application processor (AP), modem processor, central processing unit (CPU), graphics processing unit (GPU), image signal processor (ISP), controller, memory, video codec, digital signal processor (DSP), baseband processor, and / or neural network processing unit (NPU), etc. Different processors may be independent devices or integrated into one or more processors.

[0047] In some embodiments, the processor 110 can segment the tasks to be processed, and perform task processing and calculations. For example, it can perform image rendering (e.g., game screen rendering), video processing, audio processing, and artificial intelligence (AI) calculations. Furthermore, the processor 110 can also obtain information such as the storage space in the memory, the processing power of the CPU, GPU, DSP, NPU, etc., and the computing load.

[0048] The controller can be the nerve center and command center of the electronic device 100. The controller can generate operation control signals according to the instruction opcode and timing signals to complete the control of fetching and executing instructions.

[0049] The processor 110 may also include a memory for storing instructions and data. In some embodiments, the memory in the processor 110 is a cache memory. This memory can store instructions or data that the processor 110 has just used or that are used repeatedly. If the processor 110 needs to use the instruction or data again, it can retrieve it directly from the memory. This avoids repeated accesses, reduces the waiting time of the processor 110, and thus improves the efficiency of the system.

[0050] In some embodiments, the processor 110 may include one or more interfaces. Interfaces may include an inter-integrated circuit (I2C) interface, an inter-integrated circuit sound (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.

[0051] The I2C interface is a bidirectional synchronous serial bus, including a serial data line (SDA) and a serial clock line (SCL). In some embodiments, the processor 110 may include multiple I2C buses. The processor 110 can couple to the touch sensor 180K, charger, flash, camera 193, etc., through different I2C bus interfaces. For example, the processor 110 can couple to the touch sensor 180K through the I2C interface, enabling the processor 110 and the touch sensor 180K to communicate through the I2C bus interface, thereby realizing the touch function of the electronic device 100.

[0052] The I2S interface can be used for audio communication. In some embodiments, the processor 110 may include multiple I2S buses. The processor 110 can be coupled to the audio module 170 via the I2S bus to enable communication between the processor 110 and the audio module 170. In some embodiments, the audio module 170 can transmit audio signals to the wireless communication module 160 via the I2S interface to enable the function of answering phone calls through a Bluetooth headset.

[0053] The PCM interface can 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 can be coupled via the PCM bus interface. In some embodiments, the audio module 170 can also transmit audio signals to the wireless communication module 160 via the PCM interface, enabling the function of answering phone calls through a Bluetooth headset. Both the I2S interface and the PCM interface can be used for audio communication.

[0054] The UART interface is a universal serial data bus used for asynchronous communication. This bus can be a bidirectional communication bus. It converts the data to be transmitted between serial and parallel communication. In some embodiments, the UART interface is typically used to connect the processor 110 and the wireless communication module 160. For example, the processor 110 communicates with the Bluetooth module in the wireless communication module 160 via the UART interface to implement Bluetooth functionality. In some embodiments, the audio module 170 can transmit audio signals to the wireless communication module 160 via the UART interface to enable music playback through Bluetooth headphones.

[0055] The MIPI interface can be used to connect the processor 110 to peripheral devices such as the display screen 194 and the camera 193. The MIPI interface includes a camera serial interface (CSI) and a display serial interface (DSI). In some embodiments, the processor 110 and the camera 193 communicate via the CSI interface to enable the electronic device 100 to capture images. The processor 110 and the display screen 194 communicate via the DSI interface to enable the electronic device 100 to display images.

[0056] The GPIO interface can be configured via software. It can be configured as a control signal or a data signal. In some embodiments, the GPIO interface can be used to connect the processor 110 to a camera 193, a display screen 194, a wireless communication module 160, an audio module 170, a sensor module 180, etc. The GPIO interface can also be configured as an I2C interface, an I2S interface, a UART interface, a MIPI interface, etc.

[0057] USB port 130 is a USB standard compliant interface, specifically a Mini USB port, Micro USB port, USB Type-C port, etc. USB port 130 can be used to connect a charger to charge electronic device 100, and can also be used for data transfer between electronic device 100 and peripheral devices. It can also be used to connect headphones for audio playback. This interface can also be used to connect other electronic devices, such as AR devices.

[0058] It is understood that the interface connection relationships between the modules illustrated in the embodiments of this application are merely illustrative and do not constitute a structural limitation on the electronic device 100. In other embodiments of this application, the electronic device 100 may also employ different interface connection methods or combinations of multiple interface connection methods as described in the above embodiments.

[0059] The charging management module 140 receives charging input from a charger. The charger can be a wireless charger or a wired charger. In some wired charging embodiments, the charging management module 140 receives charging input from the wired charger via the USB interface 130. In some wireless charging embodiments, the charging management module 140 receives wireless charging input via the wireless charging coil of the electronic device 100. While charging the battery 142, the charging management module 140 can also supply power to the electronic device via the power management module 141.

[0060] The power management module 141 connects 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 charging management module 140, providing power to the processor 110, internal memory 121, external memory, display screen 194, camera 193, and wireless communication module 160, etc. The power management module 141 can also monitor parameters such as battery capacity, battery cycle count, and battery health status (leakage current, impedance). In some other embodiments, the power management module 141 may also be located within the processor 110. In other embodiments, the power management module 141 and the charging management module 140 may be located in the same device.

[0061] In some embodiments, the power management module 141 can determine the remaining battery power of the mobile phone in real time, and further, it can also determine the power consumption rate over a period of time.

[0062] The wireless communication function of electronic device 100 can be realized through antenna 1, antenna 2, mobile communication module 150, wireless communication module 160, modem processor and baseband processor, etc.

[0063] Antenna 1 and antenna 2 are used to transmit and receive electromagnetic wave signals. Each antenna in electronic device 100 can be used to cover one or more communication frequency bands. Different antennas can also be multiplexed to improve antenna utilization. For example, antenna 1 can be multiplexed as a diversity antenna for a wireless local area network. In some other embodiments, the antennas can be used in conjunction with tuning switches.

[0064] The mobile communication module 150 can provide solutions for wireless communication, including 2G / 3G / 4G / 5G, applied to the electronic device 100. The mobile communication module 150 may include at least one filter, switch, power amplifier, low noise amplifier (LNA), etc. The mobile communication module 150 can receive electromagnetic waves via antenna 1, and perform filtering, amplification, and other processing on the received electromagnetic waves before transmitting them to a modem processor for demodulation. The mobile communication module 150 can also amplify the signal modulated by the modem processor and convert it into electromagnetic waves for radiation via antenna 1. In some embodiments, at least some functional modules of the mobile communication module 150 may be housed in the processor 110. In some embodiments, at least some functional modules of the mobile communication module 150 and at least some modules of the processor 110 may be housed in the same device.

[0065] The modem processor may include a modulator and a demodulator. The modulator modulates the low-frequency baseband signal to be transmitted into a mid-to-high frequency signal. The demodulator demodulates the received electromagnetic wave signal into a low-frequency baseband signal. The demodulator then transmits the demodulated low-frequency baseband signal to the baseband processor for processing. After processing by the baseband processor, the low-frequency baseband signal is transmitted to the application processor. The application processor outputs sound signals through an audio device (not limited to speaker 170A, receiver 170B, etc.) or displays images or videos through the display screen 194. In some embodiments, the modem processor may be a separate device. In other embodiments, the modem processor may be independent of the processor 110 and may be housed in the same device as the mobile communication module 150 or other functional modules.

[0066] The wireless communication module 160 can provide solutions for wireless communication applications on the electronic device 100, including wireless local area networks (WLANs) (such as wireless fidelity (Wi-Fi) networks), Bluetooth (BT), global navigation satellite system (GNSS), frequency modulation (FM), near field communication (NFC), and infrared (IR) technologies. The wireless communication module 160 can be one or more devices integrating at least one communication processing module. The wireless communication module 160 receives electromagnetic waves via antenna 2, performs frequency modulation and filtering of the electromagnetic wave signals, and sends the processed signal to processor 110. The wireless communication module 160 can also receive signals to be transmitted from processor 110, perform frequency modulation and amplification, and convert them into electromagnetic waves for radiation via antenna 2.

[0067] In some embodiments, the electronic device 100 can discover other electronic devices through the wireless communication module 160 and establish communication connections with them to form a local area network, transmitting data or information to each other. For example, it can establish communication connections with other electronic devices through communication technologies such as NFC, Bluetooth, and Wi-Fi networks, exchanging business information that each needs to process, as well as their respective processing capabilities, remaining battery power, storage space, power consumption, calculation results, etc.

[0068] 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, enabling electronic device 100 to communicate with networks and other devices via wireless communication technology. The wireless communication technology may include Global System for Mobile Communications (GSM), General Packet Radio Service (GPRS), Code Division Multiple Access (CDMA), Wideband Code Division Multiple Access (WCDMA), Time Division Code Division Multiple Access (TD-SCDMA), Long Term Evolution (LTE), BT, GNSS, WLAN, NFC, FM, and / or IR technologies, etc. The GNSS may include the Global Positioning System (GPS), the Global Navigation Satellite System (GLONASS), the BeiDou Navigation Satellite System (BDS), the Quasi-Zenith Satellite System (QZSS), and / or satellite-based augmentation systems (SBAS).

[0069] Electronic device 100 implements display functions through a GPU, a display screen 194, and an application processor. The GPU is a microprocessor for image processing, connected to the display screen 194 and the application processor. The GPU is used to perform mathematical and geometric calculations and for graphics rendering. Processor 110 may include one or more GPUs, which execute program instructions to generate or modify display information.

[0070] Display screen 194 is used to display images, videos, etc. Display screen 194 includes a display panel. The display panel can be a liquid crystal display (LCD), an organic light-emitting diode (OLED), an active-matrix organic light-emitting diode (AMOLED), a flexible light-emitting diode (FLED), a Minied, MicroLED, Micro-OLED, a quantum dot light-emitting diode (QLED), etc. In some embodiments, electronic device 100 may include one or N displays 194, where N is a positive integer greater than 1. Display screen 194 can display other electronic devices that can be paired or connected with electronic device 100 to the user, allowing the user to establish a local area network composed of multiple electronic devices. Furthermore, display screen 194 can also display images and videos to the user.

[0071] Electronic device 100 can perform shooting functions through ISP, camera 193, video codec, GPU, display 194 and application processor.

[0072] The ISP (Image Signal Processor) is used to process data fed back from the camera 193. For example, when taking a picture, the shutter is opened, and light is transmitted through the lens to the camera's photosensitive element. The light signal is converted into an electrical signal, and the camera's photosensitive element transmits the electrical signal to the ISP for processing, transforming it into an image visible to the naked eye. The ISP can also perform algorithmic optimization of image noise, brightness, and skin tone. The ISP can also optimize parameters such as exposure and color temperature of the shooting scene. In some embodiments, the ISP can be set in the camera 193.

[0073] Camera 193 is used to capture still images or videos. An object is projected onto a photosensitive element by generating an optical image through the lens. The photosensitive element can be a charge-coupled device (CCD) or a complementary metal-oxide-semiconductor (CMOS) phototransistor. The photosensitive element converts the light signal into an electrical signal, which is then passed to an ISP for conversion into a digital image signal. The ISP outputs the digital image signal to a DSP for processing. The DSP converts the digital image signal into image signals in standard RGB, YUV, or other formats. In some embodiments, the electronic device 100 may include one or N cameras 193, where N is a positive integer greater than 1.

[0074] A digital signal processor (DSP) is used to process digital signals. In addition to processing digital image signals, it can also process other digital signals, such as video digital signals and audio digital signals.

[0075] Video codecs are used to compress or decompress digital video. Electronic device 100 may support one or more video codecs. Thus, electronic device 100 can play or record videos in various encoding formats, such as Moving Picture Experts Group (MPEG) 1, MPEG2, MPEG3, MPEG4, etc.

[0076] An NPU (Neural Processing Unit) is a computational processor for neural networks (NNs). By borrowing the structure of biological neural networks, such as the transmission patterns between neurons in the human brain, it can rapidly process input information and continuously learn on its own. NPUs enable intelligent cognitive applications in electronic devices, such as image recognition, facial recognition, speech recognition, and text understanding.

[0077] The external storage interface 120 can be used to connect an external memory card, such as a Micro SD card, to expand the storage capacity of the electronic device 100. The external memory card communicates with the processor 110 through the external storage interface 120 to perform data storage functions. For example, music, video, and other files can be saved on the external memory card.

[0078] Internal memory 121 can be used to store computer executable program code, which includes instructions. Processor 110 executes various functional applications and data processing of electronic device 100 by running the instructions stored in internal memory 121. Internal memory 121 may include a program storage area and a data storage area. The program storage area may store the operating system, at least one application program required for a function (such as sound playback, image playback, etc.), etc. The data storage area may store data created during the use of electronic device 100 (such as audio data, phonebook, etc.). Furthermore, internal memory 121 may include high-speed random access memory and may also include non-volatile memory, such as at least one disk storage device, flash memory device, universal flash storage (UFS), etc.

[0079] Electronic device 100 can implement audio functions, such as music playback and recording, through audio module 170, speaker 170A, receiver 170B, microphone 170C, headphone jack 170D, and application processor.

[0080] The audio module 170 is used to convert digital audio information into analog audio signals for output, and also to convert analog audio input into digital audio signals. The audio module 170 can also be used for encoding and decoding audio signals. In some embodiments, the audio module 170 may be located in the processor 110, or some functional modules of the audio module 170 may be located in the processor 110.

[0081] The speaker 170A, also known as a "loudspeaker," is used to convert audio electrical signals into sound signals. The electronic device 100 can listen to music or make hands-free calls through the speaker 170A.

[0082] The receiver 170B, also known as the "earpiece," is used to convert audio electrical signals into sound signals. When the electronic device 100 answers a telephone call or voice message, the receiver 170B can be brought close to the ear to listen to the voice.

[0083] Microphone 170C, also known as a "microphone" or "voice transducer," is used to convert sound signals into electrical signals. When making a phone call or sending a voice message, the user can speak by bringing their mouth close to microphone 170C, inputting the sound signal into microphone 170C. Electronic device 100 may have at least one microphone 170C. In some embodiments, electronic device 100 may have two microphones 170C, which, in addition to collecting sound signals, can also perform noise reduction. In other embodiments, electronic device 100 may also have three, four, or more microphones 170C, which can collect sound signals, reduce noise, identify the sound source, and perform directional recording, etc.

[0084] The 170D headphone jack is used to connect wired headphones. The 170D headphone jack can be a USB 130 interface or a 3.5mm Open Mobile Terminal Platform (OMTP) standard interface, a CTIA (Cellular Telecommunications Industry Association of the USA) standard interface.

[0085] Pressure sensor 180A is used to sense pressure signals and convert them into electrical signals. In some embodiments, pressure sensor 180A can be disposed on display screen 194. There are many types of pressure sensors 180A, such as resistive pressure sensors, inductive pressure sensors, and capacitive pressure sensors. A capacitive pressure sensor may include at least two parallel plates with conductive material. When force is applied to pressure sensor 180A, the capacitance between the electrodes changes. Electronic device 100 determines the pressure intensity based on the change in capacitance. When a touch operation is applied to display screen 194, electronic device 100 detects the intensity of the touch operation based on pressure sensor 180A. Electronic device 100 can also calculate the touch position based on the detection signal from pressure sensor 180A. In some embodiments, touch operations applied to the same touch position but with different touch operation intensities can correspond to different operation commands. For example, when a touch operation with an intensity less than a first pressure threshold is applied to the SMS application icon, a command to view an SMS is executed. When a touch operation with an intensity greater than or equal to the first pressure threshold is applied to the SMS application icon, a command to create a new SMS is executed.

[0086] The gyroscope sensor 180B can be used to determine the motion attitude of the electronic device 100. In some embodiments, the gyroscope sensor 180B can determine the angular velocity of the electronic device 100 about three axes (i.e., the x, y, and z axes). The gyroscope sensor 180B can be used for image stabilization. For example, when the shutter is pressed, the gyroscope sensor 180B detects the angle of the shake of the electronic device 100, calculates the distance that the lens module needs to compensate based on the angle, and allows the lens to counteract the shake of the electronic device 100 by moving in the opposite direction, thus achieving image stabilization. The gyroscope sensor 180B can also be used in navigation and motion-sensing game scenarios.

[0087] The barometric pressure sensor 180C is used to measure air pressure. In some embodiments, the electronic device 100 calculates altitude using the air pressure value measured by the barometric pressure sensor 180C to assist in positioning and navigation.

[0088] The magnetic sensor 180D includes a Hall sensor. The electronic device 100 can use the magnetic sensor 180D to detect the opening and closing of the flip cover. In some embodiments, when the electronic device 100 is a flip phone, the electronic device 100 can detect the opening and closing of the flip cover using the magnetic sensor 180D. Then, based on the detected opening and closing state of the cover or the flip cover, features such as automatic flip unlocking can be set.

[0089] The 180E accelerometer can detect the magnitude of acceleration of electronic device 100 in various directions (typically three axes). When electronic device 100 is stationary, it can detect the magnitude and direction of gravity. It can also be used to identify the posture of electronic devices and applied to applications such as screen orientation switching and pedometers.

[0090] A distance sensor 180F is used to measure distance. Electronic device 100 can measure distance via infrared or laser. In some embodiments, during a shooting scene, electronic device 100 can utilize the distance sensor 180F to measure distance for rapid focusing.

[0091] The proximity sensor 180G may include, for example, a light-emitting diode (LED) and a light detector, such as a photodiode. The LED may be an infrared LED. The electronic device 100 emits infrared light outward through the LED. The electronic device 100 uses the photodiode to detect infrared reflected light from nearby objects. 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 can determine that there is no object near the electronic device 100. The electronic device 100 may use the proximity sensor 180G to detect when a user holds the electronic device 100 close to their ear for a call, so as to automatically turn off the screen to save power. The proximity sensor 180G can also be used in holster mode and pocket mode for automatic unlocking and locking of the screen.

[0092] The ambient light sensor 180L is used to sense the brightness of ambient light. The electronic device 100 can adaptively adjust the brightness of the display screen 194 based on the sensed ambient light brightness. The ambient light sensor 180L can also be used to automatically adjust the white balance when taking pictures. The ambient light sensor 180L can also work with the proximity sensor 180G to detect whether the electronic device 100 is in a pocket to prevent accidental touches.

[0093] The fingerprint sensor 180H is used to collect fingerprints. The electronic device 100 can utilize the characteristics of the collected fingerprints to achieve fingerprint unlocking, accessing application locks, taking photos with fingerprints, answering calls with fingerprints, etc.

[0094] Temperature sensor 180J is used to detect temperature. In some embodiments, electronic device 100 uses the temperature detected by temperature sensor 180J to execute a temperature handling strategy. For example, when the temperature reported by temperature sensor 180J exceeds a threshold, electronic device 100 performs thermal protection by reducing the performance of a processor located near temperature sensor 180J to reduce power consumption. In other embodiments, when the temperature is below another threshold, electronic device 100 heats battery 142 to prevent abnormal shutdown of electronic device 100 due to low temperature. In still other embodiments, when the temperature is below yet another threshold, electronic device 100 boosts the output voltage of battery 142 to prevent abnormal shutdown due to low temperature.

[0095] Touch sensor 180K, also known as a "touch panel," can be located on display screen 194. The touch sensor 180K and display screen 194 together form a touchscreen, also known as a "touch screen." Touch sensor 180K detects touch operations applied to or near it. The touch sensor can transmit the detected touch operation to the application processor to determine the type of touch event. Visual output related to the touch operation can be provided through display screen 194. In other embodiments, touch sensor 180K may also be located on the surface of electronic device 100, in a different position than display screen 194.

[0096] Buttons 190 include a power button, volume buttons, etc. Buttons 190 can be mechanical buttons or touch-sensitive buttons. Electronic device 100 can receive button input and generate key signal inputs related to user settings and function control of electronic device 100.

[0097] Motor 191 can generate vibration alerts. Motor 191 can be used for incoming call vibration alerts or for touch vibration feedback. For example, different vibration feedback effects can correspond to touch operations performed on different applications (such as taking photos, playing audio, etc.). Motor 191 can also correspond to different vibration feedback effects for touch operations performed on different areas of the display screen 194. Different application scenarios (such as time reminders, receiving messages, alarm clocks, games, etc.) can also correspond to different vibration feedback effects. The touch vibration feedback effect can also be customized.

[0098] Indicator 192 can be an indicator light, used to indicate charging status, power changes, or to indicate messages, missed calls, notifications, etc.

[0099] The SIM card interface 195 is used to connect a SIM card. The SIM card can be inserted into or removed from the SIM card interface 195 to make contact with and separate from the electronic device 100. The electronic device 100 can support one or N SIM card interfaces, where N is a positive integer greater than 1. The SIM card interface 195 can support Nano SIM cards, Micro SIM cards, SIM cards, etc. Multiple cards can be inserted into the same SIM card interface 195 simultaneously. The multiple cards can be of the same or different types. The SIM card interface 195 is also compatible with different types of SIM cards. The SIM card interface 195 is also compatible with external memory cards. The electronic device 100 interacts with the network through the SIM card to realize functions such as calls and data communication. In some embodiments, the electronic device 100 uses an eSIM, i.e., an embedded SIM card. The eSIM card can be embedded in the electronic device 100 and cannot be separated from the electronic device 100.

[0100] In light of the aforementioned electronic devices, to improve power efficiency and extend battery life, some manufacturers in the prior art have begun using buck-boost converters capable of automatically switching operating modes in the power management modules of high-end electronic devices to power the camera. Of course, the output of this buck-boost converter is connected not only to the camera but also to other loads operating within the same voltage range; that is, the buck-boost converter can power multiple other loads simultaneously while powering the camera.

[0101] Figure 2 A schematic diagram of another electronic device is shown. For example, such as... Figure 2 As shown, in this electronic device 100, the input terminal of the buck-boost converter 1411 is electrically connected to the battery 142, and the output terminal is electrically connected to multiple loads with operating voltages within the same range. The loads include at least one camera 193, as well as other loads such as radio frequency power amplifiers and antenna switches.

[0102] Based on this structure, when the buck-boost converter 1411 is working, it increases or decreases the voltage of the battery 142 and converts it into the working voltage required by the load, thereby providing a stable working voltage for the load and ensuring that the load works normally.

[0103] The buck-boost converter 1411 operates in two modes: PWM mode and PFM mode. Therefore, the automatic switching of the buck-boost converter 1411 means that when the load connected to the buck-boost converter 1411 is light (i.e., when the load current is low), the converter switches to PFM mode; when the load connected to the buck-boost converter 1411 is heavy (i.e., when the load current is high), the converter switches to PWM mode. Since the current and power consumption are lower in PFM mode compared to PWM mode, the buck-boost converter 1411 can reduce power consumption and improve power efficiency by automatically switching operating modes.

[0104] It should be noted that in PWM mode, the duty cycle is adjusted by voltage feedback while the output frequency of the control circuit remains constant, thereby achieving the purpose of stabilizing the output voltage. In contrast, in PFM mode, the frequency of the modulation signal changes with the amplitude of the input signal, while its duty cycle remains constant. Figure 3 A timing diagram for PWM mode and PFM mode is shown. (As shown...) Figure 3 As shown, PWM mode uses pulse width to control voltage output; PFM mode uses the presence or absence of pulses to control voltage output.

[0105] When the buck-boost converter 1411 is working, the output current in PFM mode is smaller than that in PWM mode. Since the buck-boost converter controlled by PFM will stop operating when it reaches the set voltage, the current consumption will become very small. The reduction in current consumption can improve the efficiency under low load. Therefore, when the buck-boost converter 1411 is under light load, switching to PFM mode can improve the power supply efficiency.

[0106] Figure 4 A circuit schematic of a buck-boost converter is shown. An example is shown below. Figure 4 As shown, the buck-boost converter 1411 mainly includes a control logic sub-circuit and two power MOSFETs ( Figure 4 The components shown are T1 and T2, error amplifier, inductor L, output capacitor C, feedback resistor R1, and feedback resistor R2.

[0107] When the control logic subcircuit controls switch T1 to be on and switch T2 to be off, the input voltage flows through inductor L, supplying power to the load and storing electrical energy in inductor L and output capacitor C. After a certain period of time, the control logic subcircuit controls switch T1 to be off and switch T2 to be on. Due to the self-inductance of inductor L, the current in the circuit remains constant, continuing to charge output capacitor C. Thus, the buck-boost converter 1411 achieves the purpose of boosting or bucking the voltage.

[0108] Based on this principle, taking an input voltage higher than the output voltage as an example, when the load current is large, the control logic sub-circuit switches to PWM mode. At this time, the comparison threshold of the error amplifier narrows. Thus, even a small fluctuation in the output voltage is enough to reach the error amplifier's comparison threshold. Consequently, the switching frequency increases, and the power ripple generated by the buck-boost converter is smaller. When the switching frequency is higher than the sensitive frequency of the camera connected to the buck-boost converter (e.g., around 300kHz), the ripple generated by the buck-boost converter has very little interference with the camera, and therefore will not affect the camera's shooting performance.

[0109] When the load current is low, to improve power supply efficiency, the control logic sub-circuit switches to PFM mode. In this case, the comparison threshold of the error amplifier widens. The output voltage must then be lower or higher to reach the error amplifier's comparison threshold. Therefore, the switching frequency decreases, losses decrease, and efficiency increases, but this also leads to larger ripple in the buck-boost converter. When the switching frequency is lower than the sensitive frequency of the camera connected to the buck-boost converter, the power supply ripple generated by the converter will significantly interfere with the camera, affecting its shooting performance. For example, in low light, it may produce dark stripes during shooting.

[0110] It should be noted that since the RF power amplifier and antenna switch, which are electrically connected to the buck-boost converter 1411, are in standby mode most of the time and have low requirements for power ripple, the buck-boost converter 1411 switching to PFM mode has little impact on the RF power amplifier and antenna switch. However, the camera 193 has higher requirements for power ripple. Therefore, compared with PWM mode, when the buck-boost converter switches to PFM mode, the switching frequency is close to the sensitive frequency of the camera 193, and the interference energy generated by the buck-boost converter 1411 is higher. The impact on the shooting effect of the camera 193 cannot be ignored.

[0111] Therefore, in order to address the impact of power ripple generated by the buck-boost converter 1411, in the prior art, manufacturers have added an LDO between the buck-boost converter and the camera.

[0112] Figure 5 A schematic diagram of another electronic device is shown. (For example...) Figure 5 As shown, the input of the LDO is electrically connected to the output of the buck-boost converter 1411, and the output of the LDO is electrically connected to multiple cameras 193. The LDO can further regulate the output voltage of the buck-boost converter and filter out the power ripple generated by the buck-boost converter 1411. Therefore, by adding an LDO between the buck-boost converter 1411 and the cameras 193, the power ripple generated by the buck-boost converter can be suppressed, reducing the impact of power ripple on the camera's shooting effect.

[0113] It should be noted that, Figure 6 A circuit diagram of an LDO is shown. For example, such as... Figure 6 As shown, an LDO mainly consists of a power MOSFET ( Figure 6 The diagram shows T3 and the error amplifier, feedback resistor R3 and feedback resistor R4.

[0114] When the input voltage of the LDO changes, that is, when the output voltage of the buck-boost converter electrically connected to the LDO generates ripple, the LDO compares the output voltage obtained through feedback resistors R3 and R4 with a preset reference voltage. Then, it controls the voltage difference between the source and gate of T3 through the error amplifier to control the voltage difference between the drain and source of T3, thereby keeping the output voltage stable and thus achieving the purpose of suppressing power supply ripple.

[0115] However, when the LDO's Power Supply Rejection Ratio (PSRR) is poor, meaning the LDO's ability to suppress power supply ripple is weak, it will not be able to suppress the power supply ripple when the buck-boost converter is operating in PFM mode. This can easily lead to dark stripes appearing on the camera in low light, affecting the camera's shooting performance.

[0116] To address the aforementioned issues, this application provides an electronic device that, when at least one camera is in operation, operates a buck-boost converter in pulse width modulation (PWM) mode. Since PWM mode has lower power ripple, the influence of power ripple generated by the buck-boost converter on the camera can be eliminated, thereby resolving the problem of dark stripes appearing when the camera is shooting in low light.

[0117] The embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0118] This application provides an electronic device, which can be a mobile phone, tablet computer, wearable device, in-vehicle device, augmented reality (AR) / virtual reality (VR) device, laptop computer, ultra-mobile personal computer (UMPC), netbook, personal digital assistant (PDA), etc. The electronic device can also be other terminal devices with data processing capabilities. This application does not limit the specific type of electronic device.

[0119] Figure 7 A schematic diagram of the structure of an electronic device provided in an embodiment of this application is shown. Figure 7 As shown, the electronic device includes: a buck-boost converter 1411, a mode control module 1413, a low-dropout linear regulator 1412, and multiple loads, including at least one camera 193 and other loads besides the at least one camera.

[0120] Among them, combined Figure 7 Other loads can be RF power amplifiers, antenna switches, etc.

[0121] The buck-boost converter 1411 is electrically connected to the mode control module 1413, the low dropout linear regulator 1412, and other loads respectively; the buck-boost converter 1411 is used to generate the operating voltage of multiple loads.

[0122] It is understandable that the operating voltages of multiple loads should be within the same range. Therefore, the buck-boost converter 1411 can simultaneously provide stable voltages to loads with operating voltages within the same range.

[0123] The low-dropout linear regulator 1412 is also electrically connected to at least one camera 193. The low-dropout linear regulator 1412 is used to reduce the ripple of the operating voltage provided by the buck-boost converter 1411 to at least one camera 193.

[0124] Understandably, in combination Figure 7 Since the RF power amplifier, antenna switch, and other loads are mostly in standby mode and have low requirements for power ripple, they can be directly electrically connected to the buck-boost converter 1411. This allows the buck-boost converter 1411 to directly provide operating voltage to the aforementioned loads. However, the camera 193 is more sensitive to power ripple. Therefore, a 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 1411 to the camera 193. Of course, it is understood that in some other embodiments, the buck-boost converter 1411 in the electronic device 100 can also be directly electrically connected to the camera 193.

[0125] The mode control module 1413 is used to acquire the working status of multiple loads, including: a first state in which at least one camera 193 is working, and a second state in which no camera 193 is working.

[0126] It should be noted that the mode control module 1413 can directly or indirectly obtain the operating status of multiple loads by obtaining the operating current of the load, etc. The specific acquisition method can be set as needed, and this application embodiment does not impose any special restrictions on this.

[0127] The so-called first state refers to the state where one or more cameras are working, regardless of whether other loads are working or how many other loads are working. The so-called second state refers to the state where the device is powered off, in standby mode, or where no camera is working but other loads are working.

[0128] When multiple loads are in the first state, that is, when at least one camera is working, the mode control module provides a first control signal to the buck-boost converter; the buck-boost converter is used to switch the working mode to pulse width modulation mode under the control of the first control signal.

[0129] At this point, regardless of how many cameras are working, as long as a camera is working, the buck-boost converter will be forced to operate in PWM mode, resulting in very low power ripple. Even if the LDO has poor power ripple suppression capability, or even if the buck-boost converter is directly electrically connected to the camera, it will not affect the camera's image quality, thus preventing the camera from displaying dark stripes in low light.

[0130] It should also be noted that the first control signal can be a voltage signal, an electromagnetic induction signal, etc. This application embodiment does not impose any special restrictions on this, as long as the first control signal can control the buck-boost converter.

[0131] This application provides an electronic device including a buck-boost converter, a mode control module, a low-dropout linear regulator, and multiple loads, including at least one camera and other loads besides the camera. Based on this, when at least one camera is operating, the mode control module provides a first control signal to the buck-boost converter, causing the converter to operate in pulse width modulation (PWM) mode. Since PWM mode has lower power ripple, it can eliminate the influence of power ripple on the camera, thus solving the problem of dark stripes appearing when the camera is shooting in low light.

[0132] Alternatively, as one possible way to achieve this, combine Figure 7 When multiple loads are in the second state, i.e., when no camera is working, the mode control module provides a second control signal to the buck-boost converter; the buck-boost converter is used to automatically switch the working mode between pulse width modulation mode and pulse frequency modulation mode under the control of the second control signal.

[0133] At this point, as long as no camera is working, there is no need to consider the impact of power supply ripple. Therefore, it is only necessary to determine the weight of the load connected to the buck-boost converter based on the magnitude of the load's operating current. When the load is heavy, the buck-boost converter will automatically switch to PWM mode, and when the load is light, it will automatically switch to PFM mode to reduce power consumption and extend the battery life of electronic devices.

[0134] It should also be noted that the second control signal can be a voltage signal, an electromagnetic induction signal, etc. This application embodiment does not impose any special restrictions on this, as long as the second control signal can control the buck-boost converter.

[0135] Since this embodiment of the application provides a second control signal to the buck-boost converter through the mode control module even when the camera is not working, the working module of the buck-boost converter can automatically switch between pulse width modulation mode and pulse frequency modulation mode, thereby achieving the purpose of reducing power consumption and improving power efficiency.

[0136] Alternatively, as one possible way to achieve this, Figure 8 A schematic diagram of the structure of another electronic device provided in an embodiment of this application is shown. For example... Figure 8 As shown, the electronic device 100 also includes a battery 142, which is electrically connected to a buck-boost converter 1411, which is used to convert the voltage of the battery 142 into the operating voltage of multiple loads.

[0137] The battery can be an internal battery of the electronic device or an external battery of the electronic device.

[0138] Alternatively, as one possible way to achieve this, Figure 9 A schematic diagram of the structure of another electronic device provided in an embodiment of this application is shown. For example... Figure 9 As shown, the electronic device 100 also includes an enable control terminal Vp for providing an enable signal, and the buck-boost converter 1411 includes an enable terminal EN and a mode selection terminal MODE.

[0139] 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. The buck-boost converter 1411 is used to start working under the control of the enable signal, that is, to start converting the battery voltage into the working voltage of multiple loads.

[0140] The mode control module 1413 is electrically connected to the mode selection terminal MODE.

[0141] It should be noted that in the implementation process, the buck-boost converter 1411 is usually implemented through a buck-boost converter chip. In this case, the buck-boost converter 1411 includes multiple ports with different functions. Typically, 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 working, and the mode selection terminal is used to switch the working mode of the buck-boost converter 1411.

[0142] The enable control terminal Vp, which provides a signal to the enable terminal EN, can be any high-level terminal in the electronic device 100, outputting a constant high level. For example, the enable control terminal Vp can be the output terminal of a battery, in which case the battery will pull the enable terminal high, causing the buck-boost converter 1411 to start working. Alternatively, the enable control terminal Vp can be the 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 the enable terminal EN high, causing the buck-boost converter 1411 to start working. After the electronic device 100 is powered off, the enable terminal EN can be pulled high according to a preset interval, causing the buck-boost converter 1411 to work intermittently, thereby reducing the power consumption of the electronic device 100 when it is powered off.

[0143] When multiple loads are in the first state, that is, when at least one camera 193 is working, the mode control module 1413 provides a first control signal to the mode selection terminal MODE of the buck-boost converter 1411. Thus, the buck-boost converter 1411 switches its working mode to pulse width modulation mode under the control of the first control signal.

[0144] When multiple loads are in the second state, that is, when no camera 193 is working, the mode control module 1413 provides a second control signal to the mode selection terminal MODE of the buck-boost converter 1411; thereby, the buck-boost converter 1411 is used to automatically switch the working mode between pulse width modulation mode and pulse frequency modulation mode under the control of the second control signal.

[0145] It should be noted that when at least one camera starts working, regardless of the load, camera 193 is given priority. To ensure that the image quality of camera 193 is not affected, a first control signal is provided to the mode selection terminal MODE to force the buck-boost converter 1411 to switch to PWM mode. Although a little power consumption is sacrificed, the power ripple is reduced, so that camera 193 can no longer produce dark stripes when taking pictures in low light.

[0146] When the camera 193 is not working, the other loads do not have high requirements for power ripple. At this time, depending on the load, a second control signal is provided to the mode selection terminal MODE, so that the buck-boost converter 1411 can automatically switch between PFM mode and PWM mode, thereby reducing power consumption.

[0147] It should also be noted that, for example, the first control signal can be a low-level signal or a ground level signal, while the second control signal can be a high-level signal. Here, "high" and "low" only represent the relative magnitude relationship between voltages.

[0148] Alternatively, as one possible implementation, in Figure 9 On this basis, Figure 10 A schematic diagram of the structure of another electronic device provided in an embodiment of this application is shown. For example... Figure 10 As shown, the camera in this electronic device has a feedback voltage terminal V. IO The mode control module 1413 and the feedback voltage terminal V of the camera 193 IO Electrical connection;

[0149] When the electronic device 100 includes multiple cameras 193, each of the multiple cameras 193 has a feedback voltage terminal V. IO The feedback voltage terminal V of multiple cameras 193 IO All are electrically connected to the mode control module 1413.

[0150] When the operating state is the first state, that is, when at least one camera 193 is working, the mode control module 1413 is used to control the voltage from the feedback voltage terminal V. IO Under the control of the provided first voltage, a first control signal is generated, and then the first control signal is provided to the mode selection terminal MODE of the buck-boost converter 1411;

[0151] When the operating state is the second state, that is, when the camera 193 is not working, the mode control module 1413 is also used to control the voltage from the feedback voltage terminal V. IO Under the control of the provided second voltage, a second control signal is generated, and then the second control signal is provided to the mode selection terminal MODE of the buck-boost converter 1411.

[0152] It should be noted that the mode selection module 1413 obtains the working status of the camera 193 by directly connecting to the camera 193, thereby enabling the selection of the camera 193's feedback voltage terminal V. IO Under the control of the camera 193, the first control signal or the second control signal is output according to the working status of the camera 193.

[0153] For example, the first voltage can be a high level and the second voltage can be a low level; that is, when at least one camera is working, the feedback voltage terminal V of the camera is... IO It outputs a constant high voltage. When the camera is not operating, the camera's feedback voltage V... IO It outputs a constant low voltage.

[0154] Alternatively, the first voltage can be low and the second voltage can be high; that is, when at least one camera is working, the feedback voltage terminal V of the camera... IO It outputs a constant low voltage; when the camera is not operating, the camera's feedback voltage V... IO It outputs a constant high voltage.

[0155] Alternatively, as one possible implementation, such as Figure 10 As shown, the mode control module 1413 in the electronic device 100 includes a first transistor T11 and a first resistor R11;

[0156] The gate G of the first transistor T11 is connected to the feedback voltage terminal V. IO Electrical connections: the first terminal of the first transistor T11 is electrically connected to the ground terminal GND, and the second terminal of the first transistor T11 is electrically connected to the mode selection terminal MODE.

[0157] The first end of the first resistor R11 is electrically connected to the mode selection terminal MODE, and the second end of the first resistor R11 is electrically connected to the enable control terminal Vp.

[0158] Compared to Figure 9 The mode control module shown, when the mode control module includes a first transistor T11 and a first resistor R11, the first transistor T11 can be connected at the feedback voltage terminal V. IO It is switched on or off under the control of the circuit, acting as a switch. The first resistor R11 serves as a protection circuit.

[0159] It should be noted that the mode control module may also include multiple switching transistors connected in parallel with the first transistor T11, and / or multiple resistors connected in parallel with the first resistor R11. The above is merely an example of a mode control module; other structures with the same function as this mode control module will not be described in detail here, but all should fall within the scope of protection of this application.

[0160] Based on the above, it should also be noted that the first transistor T11 can be N-type or P-type, and its first terminal can be the drain and its second terminal can be the source, or vice versa. Furthermore, depending on the transistor's conduction mode, the first transistor can be an enhancement-mode transistor or a depletion-mode transistor. The specific form of the first transistor T11 can be configured as needed, and this application does not impose any special restrictions on it.

[0161] For example, in combination Figure 9 The first transistor T11 is an N-channel enhancement-mode MOSFET. The first electrode is the source, which is electrically connected to the ground terminal GND, and the second electrode is the drain, which is electrically connected to the mode selection terminal MODE.

[0162] Alternatively, as one possible implementation, in Figure 9 On this basis, Figure 11 A schematic diagram of the structure of another electronic device provided in an embodiment of this application is shown. For example... Figure 11 As shown, the electronic device also includes: a processor 110 with a universal input / output interface, and a mode control module 1413 electrically connected to the universal input / output interface.

[0163] When the working state is the first state, that is, when at least one camera 193 is working, the mode control module 1413 generates a first control signal under the control of a third voltage from the general input / output interface, and then transmits the first control signal to the mode selection terminal MODE of the buck-boost converter 1411.

[0164] When the operating state is the second state, that is, when the camera 193 is not working, the mode control module 1413 generates a second control signal under the control of the fourth voltage from the general input / output interface, and then transmits the second control signal to the mode selection terminal MODE of the buck-boost converter 1411.

[0165] It should be noted that the processor 110 can determine the working status of each load by reading the application status and flag status corresponding to the load, or by retrieving the corresponding opened log files. This also includes the working status of each camera. Furthermore, the processor 110 is connected to the mode control module 1413, allowing it to control the output of the mode control module 1413 after confirming the working status of the camera 193. Based on this, the mode control module 1413, under the control of the processor's GPIO interface, outputs a first control signal or a second control signal according to the working status of the camera 193.

[0166] For example, the third voltage can be a high level and the fourth voltage can be a low level. That is, when at least one camera is working, the processor's GPIO interface outputs a constant high voltage, and when no camera is working, the processor's GPIO interface outputs a constant low voltage.

[0167] Alternatively, the third voltage can be low and the fourth voltage can be high. That is, when at least one camera is working, the processor's GPIO interface outputs a constant low voltage, and when no camera is working, the processor's GPIO interface outputs a constant high voltage.

[0168] Alternatively, as one possible implementation, combining Figure 11 When the working state is the first state, that is, when at least one camera 193 is working, the processor 110 is also used to determine the gain and exposure time of the camera 193, and when the gain and exposure time meet the preset conditions, transmit the third voltage to the GPIO interface, 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.

[0169] Otherwise, if the gain and exposure time do not meet the preset conditions, even if the camera is working, the fourth voltage will be 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.

[0170] The gain and exposure time of the camera 193 can be preset using the ISP's auto exposure (AE) module. Specific parameters can be set as needed, and this application does not impose any special restrictions on them.

[0171] Understandably, when the gain and exposure time meet the preset conditions, it indicates that the camera 193 is in a dark environment under certain conditions. In this case, the operating mode of the buck-boost converter 1411 has a significant impact on the image quality of the camera 193. Therefore, the processor 110 needs to provide a third voltage to the GPIO interface to indicate to the mode control module 1413 that a camera is operating in a dark environment. When the gain and exposure time do not meet the preset conditions, it indicates that the environment in which the camera 193 is located has little impact on the shooting effect, and it is not necessary to force the buck-boost converter 1411 to operate in PWM mode. At this point, it is equivalent to a preliminary screening of the shooting environment, allowing for more precise control over whether to change the mode of the buck-boost converter 1411.

[0172] Alternatively, as one possible implementation, such as Figure 11 As shown, the mode control module includes a second resistor R12 and a third resistor R13;

[0173] 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.

[0174] The first end of the third resistor R13 is electrically connected to the mode selection terminal MODE, and the second end of the third resistor R13 is electrically connected to the enable control terminal Vp.

[0175] Among them, the second resistor R12 and the third resistor R13 can play the role of protecting the circuit. Here, the resistance value of the second resistor R12 can also be approximately zero.

[0176] It should be noted that the mode control module 1413 may also include multiple resistors connected in parallel with the second resistor R12, and / or multiple resistors connected in parallel with the third resistor R13. The above is merely an example of the mode control module 1413; other structures with the same function as the mode control module 1413 will not be described in detail here, but all should fall within the scope of protection of this application.

[0177] It should also be noted that the mode control module 1413 can be electrically connected to other loads to obtain the operating status of other loads. Alternatively, the mode control module 1413 can be electrically connected to the processor, and the processor can be electrically connected to other loads. The processor 110 determines the operating status of other loads before transmitting the information to the mode control module 1413. The specific connection methods, acquisition methods, and data acquisition methods described above can all be configured as needed, and this application does not impose any special restrictions on them.

[0178] It is understood that the structures illustrated in the embodiments of this application do not constitute a specific limitation on the electronic device 100. In other embodiments of this application, the electronic device 100 may include more or fewer components than illustrated, or combine some components, or split some components, or have different component arrangements. The illustrated components may be implemented in hardware, software, or a combination of software and hardware.

[0179] In practical applications, the aforementioned buck-boost converters are typically implemented using chips. The following provides examples of chips corresponding to buck-boost converters.

[0180] Figure 12 A schematic diagram of a chip structure corresponding to a buck-boost converter is shown. Figure 12 As shown, in addition to the enable terminal EN and the mode selection terminal MODE, the buck-boost converter also has a voltage input terminal Vin, a voltage output terminal Vout, a switch signal terminal LX1, a switch signal terminal LX2, a feedback terminal FB, and a ground terminal.

[0181] An inductor L is connected between the switch signal terminals LX1 and LX2, and a voltage divider resistor is connected between the feedback terminal FB and the ground level to control the output voltage.

[0182] Combination Figure 12 When the input voltage is higher than the output voltage, the buck-boost converter is used to step down the voltage. In this case, the first stage involves switches S1 and S4 closing and switches S2 and S3 opening, charging inductor L. The second stage involves switches S2 and S3 closing and switches S1 and S4 opening, discharging inductor L. The first and second stages are repeated, thus the buck-boost converter can convert the input voltage to the output voltage.

[0183] When the input voltage is lower than the output voltage, the buck-boost converter functions as a step-up converter. In this case, the first stage involves switches S1 and S3 closing and switches S2 and S4 opening, charging inductor L. The second stage involves switches S1 and S4 closing and switches S2 and S3 opening, discharging inductor L. The first and second stages are repeated, thus converting the input voltage to the output voltage.

[0184] exist Figure 12 On this basis, Figure 13 A schematic diagram of another buck-boost converter chip is shown. This buck-boost converter, in addition to an enable terminal (EN) and a mode selection terminal (MODE), also has multiple voltage input terminals, multiple voltage output terminals, multiple switching signal terminals (LX1), multiple switching signal terminals (LX2), a feedback terminal (FB), and multiple ground terminals. Furthermore, it includes multiple capacitors. Its internal working principle is the same as described above. Figure 12 The working principle of the chips shown is basically the same, so it will not be described again here.

[0185] Based on the above, this application also provides a control method applied to the aforementioned electronic device. The following will be combined with... Figure 13 The chip structure corresponding to the buck-boost converter shown above is related to the above. Figure 10 and Figure 11 The control methods corresponding to the electronic devices will be explained in detail.

[0186] in, Figure 14 for Figure 10 The connection diagram of the mode control module and the buck-boost converter shown is as follows. Figure 15 for Figure 11 The diagram shows the connection between the mode control module and the buck-boost converter.

[0187] Figure 16 A flowchart illustrating a control method for an electronic device is shown, such as... Figure 16 As shown, when the electronic device includes a buck-boost converter 1411, a mode control module 1413, a low-dropout linear regulator 1412, and multiple loads, the multiple loads including at least one camera 193 and other loads besides at least one camera, the control method of the electronic device includes the following S10 to S40.

[0188] S10, the buck-boost converter generates the operating voltage for multiple loads.

[0189] When the electronic device also includes a battery, the buck-boost converter is electrically connected to the battery. In this case, the buck-boost converter is used to convert the battery voltage into the operating voltage of multiple loads.

[0190] S20, a low-dropout linear regulator reduces the ripple of the operating voltage provided by the buck-boost converter to at least one camera.

[0191] S30. When the working state is the first state, that is, when at least one camera is working, the mode control module provides a first control signal to the buck-boost converter; under the control of the first control signal, the buck-boost converter switches the working mode to pulse width modulation mode.

[0192] This application provides a control method for an electronic device. When at least one camera is working in the load, a first control signal is provided to the buck-boost converter through a mode control module, so that the buck-boost converter works in pulse width modulation mode. Since the power ripple of the pulse width modulation mode is small, the influence of power ripple on the camera can be eliminated, thus solving the problem of dark stripes appearing when the camera is shooting in low light.

[0193] Alternatively, as one possible implementation, such as Figure 16 As shown, the method also includes:

[0194] S40. When the working state is the second state, that is, when no camera is working, the mode control module provides a second control signal to the buck-boost converter; under the control of the second control signal, the buck-boost converter automatically switches the working mode between pulse width modulation mode and pulse frequency modulation mode.

[0195] In other cases where the camera is not working, the embodiment of this application provides a second control signal to the buck-boost converter through the mode control module, so that the buck-boost converter can automatically switch between pulse width modulation mode and pulse frequency modulation mode, thereby reducing power consumption and improving power efficiency.

[0196] Alternatively, as one possible implementation, such as Figure 14 and Figure 15 As shown, 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-mentioned S10 includes:

[0197] The enable control terminal provides an enable signal to the enable terminal of the buck-boost converter, and the buck-boost converter starts to work under the control of the enable signal.

[0198] The above-mentioned S30 includes:

[0199] When the working state is the first state, that is, when at least one camera is working, the mode control module provides a first control signal to the mode selection terminal of the buck-boost converter, so that the buck-boost converter can switch to pulse width modulation mode under the control of the first control signal.

[0200] The above-mentioned S40 includes:

[0201] When the working state is the second state, that is, when no camera is working, the mode control module provides a second control signal to the mode selection terminal of the buck-boost converter, so that the buck-boost converter can automatically switch between pulse width modulation mode and pulse frequency modulation mode under the control of the second control signal.

[0202] Since buck-boost converters typically have an enable terminal and a mode selection terminal, a signal can be provided to the enable terminal EN to enable the buck-boost converter to start using the operating voltage of the battery voltage converter load. Based on this, when at least one camera is working, a first control signal is provided to the mode selection terminal of the buck-boost converter through the mode control module to force the buck-boost converter to work in pulse width modulation mode. Since the power supply ripple is reduced in pulse width modulation mode, the influence of power supply ripple on the camera can be eliminated, thus solving the problem of dark stripes appearing when the camera is shooting in low light.

[0203] When the camera is not in operation, by providing a second control signal to the mode selection terminal of the buck-boost converter, the buck-boost converter can automatically switch between pulse width modulation mode and pulse frequency modulation mode, thereby reducing power consumption and improving power efficiency.

[0204] Alternatively, as one possible implementation, combining Figure 14 When the camera 193 in the electronic device 100 has a feedback voltage terminal V IO The mode control module 1413 and the feedback voltage terminal V of the camera 193 IO When electrically connected, the above-mentioned S30 includes:

[0205] From the feedback voltage terminal V IO Under the control of the first voltage, the mode control module 1413 provides a first control signal to the mode selection terminal of the buck-boost converter 1411.

[0206] The above-mentioned S40 includes:

[0207] From the feedback voltage terminal V IO Under the control of the second voltage, the mode control module 1413 provides a second control signal to the mode selection terminal of the buck-boost converter 1411.

[0208] Alternatively, as one possible implementation, combining Figure 14 When the mode control module 1413 includes a first transistor T11 and a first resistor R11, the voltage from the feedback voltage terminal V... IO Under the control of the voltage, the mode control module 1413 provides a first control signal to the mode selection terminal MODE of the buck-boost converter 1411, including:

[0209] Feedback voltage terminal V IO The first voltage is transmitted to the gate G of the first transistor T11, turning on the first transistor T11. At this time, the ground level on the ground terminal GND will be provided as the first control signal to the mode selection terminal MODE of the buck-boost converter 1411.

[0210] From the feedback voltage terminal V IO Under 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:

[0211] Feedback voltage terminal V IO The second voltage is transmitted to the gate G of the first transistor T11, causing the first transistor T11 to turn off. At this time, the enable signal of the enable signal terminal EN will be provided as the second control signal to the mode selection terminal of the buck-boost converter 1411.

[0212] It should be noted that when the resistance of the first resistor R11 is small, it can be ignored, and the enable signal is transmitted to the mode selection terminal MODE as the second control signal. When the resistance of the first resistor R11 is large, the enable signal is transmitted to the mode selection terminal MODE as the second control signal after being divided by the first resistor R11.

[0213] For example, in combination Figure 14 If the first transistor T11 in the mode selection module 1413 is an N-channel enhancement-mode 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 100kΩ, and the enable signal of the enable control terminal Vp is high level.

[0214] Based on this, when at least one camera 193 is working, the working camera 193 will transmit a voltage through the feedback voltage terminal V. IO When a high level is provided to the gate G of the first transistor T11, the first transistor T11 will conduct. The ground level connected to the source of the first transistor T11 will be transmitted to the mode selection terminal MODE. At this time, the mode selection terminal MODE will be pulled to ground, and the buck-boost converter 1411 will be forced to operate in PWM mode. Assuming the switching frequency of PWM mode is 2MHz, this can avoid the sensitive frequency band of the camera 193 and solve the dark stripe problem.

[0215] When no camera 193 is working, the feedback voltage terminal V of all cameras 193 IO When a low level is provided to the gate G of the first transistor T11, the first transistor T11 is turned off. At this time, the mode selection terminal MODE will be pulled up to the enable control terminal Vp through the first resistor R11. When the mode selection terminal MODE inputs a high level, the buck-boost converter 1411 will automatically switch between pulse width modulation mode and pulse frequency modulation mode to improve power efficiency and extend the battery life of the mobile phone.

[0216] Alternatively, as one possible implementation, combining Figure 15 When the electronic device 100 further includes a processor 110 with a universal input / output interface; and the mode control module 1413 is electrically connected to the universal input / output interface, the above-mentioned S30 includes:

[0217] Under the control of a third voltage from the general purpose input / output interface, the mode control module 1413 provides a first control signal to the mode selection terminal MODE of the buck-boost converter 1411.

[0218] The above-mentioned S40 includes:

[0219] Under the control of a fourth voltage from the general purpose input / output interface, the mode control module provides a second control signal to the mode selection terminal of the buck-boost converter.

[0220] Alternatively, as one possible implementation, combining Figure 15 Under the control of a third voltage from the general purpose input / output interface, the mode control module provides a first control signal to the mode selection terminal of the buck-boost converter. Previously, the method also included:

[0221] The processor determines the camera's gain and exposure time.

[0222] When the camera gain and exposure time meet preset conditions, the processor provides a third voltage to the general-purpose input / output interface; otherwise, it provides a fourth voltage to the general-purpose input / output interface.

[0223] For example, Figure 15 As shown, if the resistance of the second resistor R12 is 0Ω and the resistance of the third resistor R13 is 100kΩ, the enable control terminal Vp is at a high level.

[0224] Based on this, when at least one camera 193 is working, the processor 110 determines that a camera 193 is working and provides a low level to the GPIO interface. Under the control of this 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 PWM mode. Assuming the switching frequency of PWM mode is 2MHz, this avoids the sensitive frequency band of the camera 193, thus resolving the dark stripe problem.

[0225] Here, the processor 110 can first determine whether the camera gain and exposure time meet the preset conditions. If they do, it provides a low level to the GPIO interface; otherwise, it provides a high level to the GPIO interface.

[0226] When the camera 193 is not working, the processor 110 will provide a high level to the GPIO interface, the mode selection terminal MODE will be pulled high, and the buck-boost converter 1411 will automatically switch between pulse width modulation mode and pulse frequency modulation mode to improve power efficiency and extend the phone's battery life.

[0227] It should be understood that the sequence number of each step in the above embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0228] Finally, it should be noted that the above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An electronic device, comprising: buck-boost converter, mode control module, at least one camera, and other loads; The buck-boost converter is electrically connected to the mode control module, the at least one camera, and the other load, respectively. The buck-boost converter has two operating modes: pulse width modulation (PWM) mode and pulse frequency modulation (PFM) mode, and is configured to provide operating voltage for the at least one camera and the other loads. The mode control module is used to acquire the operating status of the at least one camera and the other loads; wherein... When the operating state is that at least one of the at least one cameras is operational, the mode control module provides a first control signal to the buck-boost converter; the buck-boost converter is configured to operate in PWM mode in response to the first control signal; and When the operating state is that none of the at least one camera is working, the mode control module provides a second control signal to the buck-boost converter; the buck-boost converter is configured to automatically switch between the PWM mode and the PFM mode in response to the second control signal.

2. The electronic device according to claim 1, characterized in that, The buck-boost converter is configured to operate automatically switching between the PWM mode and the PFM mode in response to the second control signal, further comprising: The buck-boost converter automatically switches between PWM mode and PFM mode according to the weight of the other loads.

3. The electronic device according to claim 2, characterized in that, When the other loads connected to the buck-boost converter are heavy, that is, when the operating current of the other loads is detected to be large, the buck-boost converter switches to PWM mode. as well as When the other loads connected to the buck-boost converter are relatively light, that is, when the operating current of the other loads is detected to be small, the buck-boost converter switches to PFM mode.

4. The electronic device according to claim 1, characterized in that, The electronic device further includes: a low-dropout linear regulator electrically connected between the buck-boost converter and the at least one camera, and configured to reduce the ripple of the operating voltage provided by the buck-boost converter to the at least one camera.

5. The electronic device according to claim 1, characterized in that, The first control signal is a voltage signal or an electromagnetic induction signal; and The second control signal is a voltage signal or an electromagnetic induction signal.

6. The electronic device according to claim 1, characterized in that, The electronic device also includes a processor with a general-purpose input / output interface; the mode control module is electrically connected to the general-purpose input / output interface; When the working state is that at least one of the at least one cameras is working, the mode control module is used to generate the first control signal under the control of a first voltage from the general input / output interface; When the operating state is that none of the at least one camera is working, the mode control module is used to generate the second control signal under the control of a second voltage from the general input / output interface.

7. The electronic device according to claim 6, characterized in that, When the operating state is such that at least one of the at least one cameras is working, the processor is also used to determine the gain and exposure time of the cameras, and when the gain and the exposure time meet preset conditions, to provide the first voltage to the general input / output interface.

8. The electronic device according to claim 7, characterized in that, The condition that the gain and the exposure time meet the preset conditions further includes: when the camera is in a low-light environment, the gain and the exposure time meet the preset conditions.

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