CN115459411B - Power supply units and terminal equipment - Google Patents

Abstract

The application provides a power supply device and terminal equipment, this power supply device can include: the power supply comprises a boosting unit, a first switch and a backlight power supply, wherein the boosting unit is used for boosting an electric signal input by an input end and outputting the boosted electric signal from a first output end; the input end of the boosting unit is used for being connected with a battery, the first output end of the boosting unit is connected with the first input end of a backlight power supply, the first output end of the backlight power supply is used for being connected with a light-emitting device, the first end of the first switch is connected with the input end of the boosting unit, and the second end of the first switch is connected with the first input end of the backlight power supply. The power supply device provided by the application flexibly switches the working state of the boosting unit through the opening and closing of the first switch so as to change the input voltage of the backlight power supply, and the power supply device can be suitable for different scenes and has higher flexibility.

Description

Power supply units and terminal equipment

technical field

The present application relates to the technical field of terminals, and in particular to a power supply device and a terminal device.

Background technique

The backlight power supply in the terminal device is used to provide light source for the display screen of the terminal device. The backlight power supply includes three output pins, which are AVDD pin, ELVDD pin and ELVSS pin respectively. Wherein, the AVDD pin is a power supply pin for external power supply, and its output voltage is generally 7.6 volts (voltage, V). The ELVDD pin and the ELVSS pin can be collectively referred to as power supply pins. The output voltage of the ELVDD pin is generally 4.6V, and the output voltage of the ELVSS pin is generally -2V to -4V.

At present, the terminal equipment can use the battery to supply power for the backlight through the charging chip. However, the input voltage of the backlight power supply is 3~4.3V, and the output of the backlight power supply is 7.6V, 4.6V or -2V. pin) matched voltage, resulting in large backlight power consumption and low efficiency.

Therefore, there is an urgent need for a power supply device that can improve the efficiency of the backlight power supply.

Contents of the invention

The present application provides a power supply device and a terminal device, which can improve the efficiency of a backlight power supply.

In the first aspect, the present application provides a power supply device, including: a boost unit, a first switch, and a backlight power supply. For the compressed electrical signal, the backlight power supply is used to perform first step-up processing on the electrical signal input from the first input terminal and output the boosted electrical signal from the first output terminal; wherein, the input terminal of the boost unit is used to connect battery, the first output end of the boost unit is connected to the first input end of the backlight power supply, the first output end of the backlight power supply is used to connect the light emitting device, the first end of the first switch is connected to the input end of the boost unit, and the first The second terminal of a switch is connected with the first input terminal of the backlight power supply.

The boost unit may also be called a boost chip, which is not limited in this application. The boost unit is used to boost the electrical signal input at the input terminal and output the boosted electrical signal from the first output terminal. It can be understood that the boost unit can increase the input voltage at the input terminal and output the boosted electrical signal. voltage.

The backlight power supply can be connected with the light emitting device to supply power for the light emitting device. Wherein, the light emitting device may be a light emitting diode (light emitting diode, LED). The output voltage of the output terminal of the backlight power supply may vary according to the load, that is, the light emitting device. The backlight power supply is used to perform first step-up processing on the electrical signal input at the first input terminal and output the boosted electrical signal from the first output terminal. It can be understood that the backlight power supply can increase the input voltage at the input terminal and output the increased voltage. It should be noted that the first input terminal of the backlight power supply is used to represent an input pin of the backlight power supply, and may represent one or more input pins, which is not limited in this application.

Exemplarily, the output pins of the backlight power supply may include AVDD pins, ELVDD pins and ELVSS pins. The AVDD pin can be called a power supply pin for external power supply. The ELVDD pin and the ELVSS pin may be collectively referred to as supply pins. The first output terminal may be the AVDD pin and/or the ELVDD pin.

The first end of the first switch is connected to the input end of the boost unit, and the second end of the first switch is connected to the first input end of the backlight power supply. It can also be understood that the first switch is connected in parallel with the boost unit. It can be understood that when the first switch is closed, the boost unit is short-circuited, that is, the boost unit does not work. When the first switch is turned off, the boost unit is turned on.

When the first switch is closed, the battery can directly supply power to the backlight power supply through the first switch; when the first switch is turned off, the battery can supply power to the backlight power supply through the boost unit.

Exemplarily, the first switch may be the switch A in FIG. 4 in the embodiment, the backlight power supply may be the backlight power supply 150 in FIG. 4 , and the battery may be the battery 132 in FIG. 4 . When the switch A is closed, the boost unit is short-circuited, and the battery 132 can transmit electrical signals to the backlight power supply 150 through the power management module 131 through the switch A. When the switch is turned off, the boost unit is turned on, and the battery 132 can transmit electrical signals to the backlight power supply 150 through the power management module 131 boost units.

When the first switch is closed, the input voltage of the backlight power supply is the output voltage of the battery; when the first switch is open, the boost unit increases the output voltage of the battery and outputs the raised voltage to the backlight power supply.

Closing and opening of the first switch can be determined based on different factors.

In a possible example, the closing and opening of the first switch may be determined based on the remaining power of the battery.

The first switch can be used to: close when the remaining power of the battery is greater than or equal to the first preset power; open when the remaining power of the battery is less than the first preset power.

In another possible example, the closing and opening of the first switch may be determined based on the maximum output voltage of the boost unit.

The first switch can be used to: close when the output voltage of the battery is greater than or equal to the maximum output voltage of the boost unit; open when the output voltage of the battery is lower than the maximum output voltage of the boost unit.

In yet another possible example, the closing and opening of the first switch may be determined based on the remaining power of the battery and the maximum output voltage of the boost unit.

Closed when the remaining power of the battery is greater than or equal to the first preset power, or the output voltage of the battery is greater than or equal to the maximum voltage that the boost unit can output; when the remaining power of the battery is less than the first preset power, or the output voltage of the battery It is disconnected when it is less than the maximum output voltage of the booster unit.

Optionally, the boost unit and the first switch may be packaged in different chips, or in the same chip, which is not limited in this application.

Optionally, the boost unit, the first switch, and the backlight power supply are respectively packaged in different chips, or can be packaged in the same chip, which is not limited in this application.

Exemplarily, the boost unit and the first switch can be packaged in a chip including the backlight power supply.

In the power supply device provided by this application, when the first switch is turned off, the input voltage of the backlight power supply is the voltage raised by the booster unit, which can reduce the voltage difference between the input voltage and the output voltage of the backlight power supply, and reduce the backlight power supply voltage. The power consumption of the backlight power supply is beneficial to improve the efficiency of the backlight power supply; when the first switch is closed, the input voltage of the backlight power supply is the output voltage of the battery, and the working state of the boost unit can be flexibly switched by opening and closing the first switch to change The input voltage of the backlight power supply can be applied to different scenarios with high flexibility.

With reference to the first aspect, in some implementations of the first aspect, the power supply device further includes a control unit, the control unit is used to: detect the remaining power of the battery; when the remaining power of the battery is greater than or equal to the first preset power, control The first switch is turned on; when the remaining power of the battery is less than the first preset power, the first switch is controlled to be turned off.

The control unit may be a unit with processing functions. For example, the control unit may be the processor 110 shown in FIG. 1 in the embodiment, but the application is not limited thereto. The control unit may control the first switch to be closed or opened based on the remaining power of the battery.

Specifically, the control unit can detect the remaining power of the battery in real time or periodically. If the remaining power of the battery is greater than or equal to the first preset power, it means that the power of the battery is sufficient. At this time, the control unit can control the first switch to be closed, the boost unit is short-circuited, and the output voltage of the backlight power supply is the output voltage of the battery. If the remaining power of the battery is less than the first preset power, it means that the power of the battery is insufficient. At this time, the control unit can control the first switch to be turned off, and the booster unit to be connected to increase the output voltage of the battery and output it to the backlight power supply. the increased voltage. Wherein, the first preset electric quantity can be a lower electric quantity, for example: the first predetermined electric quantity is 20% or 30%, also can be a higher electric quantity, for example, the first predetermined electric quantity is 60% or 70% %, this application is not limited to this.

In the power supply device provided by the present application, the control unit can control the first switch to be turned on or off according to the remaining power of the battery, and when the remaining power of the battery is less than the first preset power, the input voltage of the backlight power supply is increased through the boost unit , which is conducive to reducing the power consumption of the backlight power supply, saving power consumption, and prolonging the use time of the backlight power supply; when the remaining power of the battery is greater than or equal to the first preset power supply, the output voltage of the battery is used as the input of the backlight power supply Voltage, flexibly change the input voltage of the backlight power supply, which can be applied to different scenarios, with high flexibility.

With reference to the first aspect, in some implementations of the first aspect, the power supply device further includes a control unit, the control unit is used to: detect the output voltage of the battery; when the output voltage of the battery is greater than or equal to the maximum voltage that the boost unit can output When , the first switch is controlled to be closed.

The control unit may be a unit with processing functions. For example, the control unit may be the processor 110 shown in FIG. 1 in the embodiment, but the application is not limited thereto. The control unit may control the first switch to be closed or opened based on the output voltage of the battery and the maximum output voltage of the boost unit.

Specifically, the control unit can detect the output voltage of the battery in real time. If the output voltage of the battery is greater than or equal to the maximum voltage that the boost unit can output, it means that the boost unit does not need to boost the voltage. At this time, the control unit can control the first switch to be closed, the boost unit is short-circuited, and the output voltage of the backlight power supply is The output voltage of the battery. If the output voltage of the battery is lower than the maximum output voltage of the booster unit, it means that the booster unit can boost the voltage. At this time, the control unit can control the first switch to be turned off, and the booster unit is turned on to increase the output of the battery. voltage, and output the boosted voltage to the backlight power supply. Wherein, the maximum output voltage of the boost unit is related to the output voltage of the backlight power supply. The boost unit can output the maximum

The maximum voltage should be less than the output voltage of the backlight power supply. For example, the output voltage of the backlight power supply is 7.6V, and the maximum output voltage of the boost unit should be less than 7.6V. Alternatively, the output voltage of the backlight power supply is 4.6V, and the maximum output voltage of the boost unit should be less than 4.6V.

In the power supply device provided by the present application, the control unit can control the first switch to close or open according to the output voltage of the battery and the maximum voltage that the boost unit can output. When the output voltage of the battery is lower than the maximum voltage that the boost unit can output , through the boost unit to increase the input voltage of the backlight power supply, it is beneficial to reduce the power consumption of the backlight power supply, save power consumption, and help to prolong the use time of the backlight power supply; when the output voltage of the battery is greater than or equal to the maximum output voltage of the boost unit In the case of voltage, the output voltage of the battery is used as the input voltage of the backlight power supply, and the input voltage of the backlight power supply can be changed flexibly, which can be applied to different scenarios and has high flexibility.

With reference to the first aspect, in some implementations of the first aspect, the backlight power supply is further used to perform a second boosting process on the electrical signal input from the second input terminal and output the boosted electrical signal from the second output terminal; Wherein, the electrical signal input to the second input terminal of the backlight power supply and the electrical signal input to the input terminal of the boost unit are the same electrical signal.

The backlight power supply may include a first input terminal and a second input terminal. The backlight power supply may perform first step-up processing on the electrical signal input from the first input terminal and output the boosted electrical signal from the first output terminal, and may perform the first step-up processing on the electrical signal input from the first input terminal. The electrical signal input from the second input terminal is subjected to the second boosting process and the boosted electrical signal is output from the second output terminal, however, the electrical signal input from the first input terminal is the electrical signal output from the boosting unit, while the second input terminal The electrical signal input at the terminal and the electrical signal input at the input terminal of the booster unit are the same electrical signal, that is, the electrical signal output by the battery, that is to say, the voltage at the first input terminal of the backlight power supply can be the voltage boosted by the booster unit , and the voltage of the second input terminal of the backlight power supply is the output voltage of the battery.

If the first output terminal of the backlight power supply is the AVDD pin, then the second output terminal of the backlight power supply is the ELVDD pin. If the first output terminal of the backlight power supply is the ELVDD pin, then the second output terminal of the backlight power supply is the AVDD pin.

Exemplarily, the first output end of the backlight power supply is the AVDD pin, and the second output end of the backlight power supply is the ELVDD pin. In the example shown in FIG. 6 in the embodiment, the backlight power supply can be the backlight power supply 150, the first input end of the backlight power supply can be the input pin a of the backlight power supply 150, and the second input end of the backlight power supply can be the backlight power supply 150 input pin b. The backlight power supply 150 can adjust the input voltage of the input pin a to the output voltage of the AVDD pin (ie, the first output terminal), and the backlight power supply 150 can adjust the input voltage of the input pin b to ELVDD (ie, the second output terminal) pin output voltage. The first switch may be switch B, and the battery may be battery 132 .

In the power supply device provided by this application, the first input terminal of the backlight power supply and the second input terminal input different electrical signals, and when the first switch is turned off, the boost chip only outputs the boosted voltage Voltage only reduces the voltage difference between the first output end and the first input end of the backlight power supply, which is beneficial to reducing the power consumption of the backlight power supply, saving power consumption, and prolonging the use time of the backlight power supply.

With reference to the first aspect, in some implementations of the first aspect, the boost unit is also used to output the boosted electrical signal from the second output terminal; the backlight power supply is also used to perform electrical signal input from the second input terminal. The second boost process and output the boosted electrical signal from the second output terminal; the second output terminal of the boost unit is connected to the second input terminal of the backlight power supply; the power supply device also includes a second switch, the first switch of the second switch One end is connected with the input end of the boost unit, and the second end of the second switch is connected with the second input end of the backlight power supply.

The backlight power supply may include a first input terminal and a second input terminal, the first input terminal of the backlight power supply is connected to the first output terminal of the boost unit, and the second output terminal of the backlight power supply is connected to the second output terminal of the boost unit.

The power supply device provided in the embodiment of the present application includes a first switch and a second switch, the first end of the first switch is connected to the input end of the boost unit, the second end of the first switch is connected to the first input end of the backlight power supply, The first end of the second switch is connected to the input end of the boost unit, and the second end of the second switch is connected to the second input end of the backlight power supply.

It should be noted that the states of the first switch and the second switch are the same, that is, both the first switch and the second switch are closed, or the first switch and the second switch are both open.

When both the first switch and the second switch are closed, the boost unit is short-circuited. When both the first switch and the second switch are turned off, the boost unit is connected.

Exemplarily, in the example shown in FIG. 8 in the embodiment, the backlight power supply is the backlight power supply 150 . The first input end of the backlight power supply can be the input pin a of the backlight power supply 150, the second input end of the backlight power supply can be the input pin b of the backlight power supply 150, and the first output end of the backlight power supply is the AVDD lead of the backlight power supply 150. The second output terminal of the backlight power supply is the ELVDD pin of the backlight power supply 150 . If the first switch is switch C, the second switch may be switch D; if the first switch is switch D, the second switch may be switch C. The first switch is a switch C, and the second switch is a switch D as an example for description.

When both the switch C and the switch D are closed, the boost unit is short-circuited, the voltages of the input pin a and the input pin b of the backlight power supply 150 are both the output voltage of the battery, and the backlight power supply 150 first boosts the output voltage of the battery Processing and outputting the boosted electrical signal from the AVDD pin, performing a second boosting process on the output voltage of the battery and outputting the boosted electrical signal from the ELVDD pin.

When both the switch C and the switch D are turned off, the boost unit is connected, the voltages of the input pin a and the input pin b of the backlight power supply 150 are both the voltages output by the boost power supply, and the backlight power supply 150 controls the output voltage of the boost power supply. The first step-up process is performed and the boosted electrical signal is output from the AVDD pin, and the second step-up process is performed on the voltage output by the boost power supply and the boosted electrical signal is output from the ELVDD pin.

In the power supply device provided by the present application, when the first switch and the second switch are turned off, the input voltage of the backlight power supply is the voltage boosted by the booster unit, which can reduce the voltage difference between the input voltage and the output voltage of the backlight power supply , to reduce the power consumption of the backlight power supply, which is beneficial to improve the efficiency of the backlight power supply; when the first switch and the second switch are closed, the input voltage of the backlight power supply is the output voltage of the battery, which can be switched flexibly by opening and closing the first switch. The working status of the voltage unit can be changed to change the input voltage of the backlight power supply, which can be applied to different scenarios and has high flexibility.

With reference to the first aspect, in some implementations of the first aspect, the power supply device further includes a control unit, and the control unit is configured to: detect the remaining power of the battery; when the remaining power of the battery is greater than or equal to the second preset power, control The first switch and the second switch are turned on; when the remaining power of the battery is less than a second preset power, the first switch and the second switch are controlled to be turned off.

The control unit may be a unit with processing functions. For example, the control unit may be the processor 110 shown in FIG. 1 in the embodiment, but the application is not limited thereto. The control unit may control the first switch and the second switch to be closed or opened based on the remaining power of the battery.

Specifically, the control unit can detect the remaining power of the battery in real time or periodically. If the remaining power of the battery is greater than or equal to the second preset power, it means that the power of the battery is sufficient. At this time, the control unit can control the first switch and the second switch to be closed, the boost unit is short-circuited, and the output voltage of the backlight power supply is the battery voltage. output voltage. If the remaining power of the battery is less than the first preset power, it means that the power of the battery is insufficient. At this time, the control unit can control the first switch and the second switch to be turned off, and the booster unit is turned on to increase the output voltage of the battery. The boosted voltage is output to the backlight power supply. Wherein, the second preset electric quantity may be the same as or different from the above-mentioned first predetermined electric quantity, which is not limited in this application.

If the second preset power is different from the first preset power, when the first preset power is a lower power, the second preset power may be lower than the first preset power. When the first preset electric quantity is a relatively high electric quantity, the second predetermined electric quantity may be higher than the first predetermined electric quantity.

Exemplarily, if the first preset electricity is 20%, the second preset electricity may be 15%. If the first preset power is 60%, the second preset power may be 70%.

In the power supply device provided by the present application, the control unit can control the first switch and the second switch to close or open according to the remaining power of the battery, and when the remaining power of the battery is less than the second preset power, the backlight is boosted by the booster unit The input voltage of the power supply is conducive to reducing the power consumption of the backlight power supply, saving power consumption, and prolonging the use time of the backlight power supply; when the remaining power of the battery is greater than or equal to the second preset power, the output voltage of the battery is used as the The input voltage of the backlight power supply can be changed flexibly, which can be applied to different scenarios and has high flexibility.

With reference to the first aspect, in some implementations of the first aspect, the power supply device further includes a control unit, the control unit is used to: detect the output voltage of the battery; when the output voltage of the battery is greater than or equal to the maximum voltage that the boost unit can output When , the first switch and the second switch are controlled to be closed.

The control unit may be a unit with processing functions. For example, the control unit may be the processor 110 shown in FIG. 1 in the embodiment, but the application is not limited thereto. The control unit may control the first switch to be closed or opened based on the output voltage of the battery and the maximum output voltage of the boost unit.

Specifically, the control unit can detect the output voltage of the battery in real time. If the output voltage of the battery is greater than or equal to the maximum voltage that the boost unit can output, it means that the boost unit does not need to boost the voltage. At this time, the control unit can control the first switch and the second switch to be closed, the boost unit is short-circuited, and the backlight power supply The output voltage is the output voltage of the battery. If the output voltage of the battery is lower than the maximum voltage that the boost unit can output, it means that the boost unit can boost the voltage. At this time, the control unit can control the first switch and the second switch to be turned off, and the boost unit is turned on to boost the voltage. The output voltage of the high battery outputs the boosted voltage to the backlight power supply. Wherein, the maximum output voltage of the boost unit is related to the output voltage of the backlight power supply. The maximum output voltage of the boost unit should be less than the output voltage of the backlight power supply.

It should be noted that when the power supply device includes the first switch and when the power supply device includes the first switch and the second switch, the maximum output voltage of the boost unit is different.

In the power supply device provided by this application, the control unit can control the first switch and the second switch to close or open according to the output voltage of the battery and the maximum voltage that the boost unit can output. In the case of high voltage, the input voltage of the backlight power supply is raised through the booster unit, which is conducive to reducing the power consumption of the backlight power supply, saving power consumption, and prolonging the use time of the backlight power supply; when the output voltage of the battery is greater than or equal to the booster unit In the case of the maximum output voltage, the output voltage of the battery is used as the input voltage of the backlight power supply, and the input voltage of the backlight power supply can be changed flexibly, which can be applied to different scenarios and has high flexibility.

With reference to the first aspect, in some implementation manners of the first aspect, the boosting ratio of the first boosting process is greater than the boosting ratio of the second boosting process.

The ratio of the voltage at the first output end of the backlight power supply to the voltage at the first input end of the backlight power supply is the boost ratio of the first boosting process, and the ratio of the voltage at the second output end of the backlight power supply to the voltage at the second input end of the backlight power supply is The boost ratio of the second boost process.

The voltage of the first input terminal of the backlight power supply is the same as the voltage of the second input terminal of the backlight power supply, and the boost ratio of the first boosting process is greater than the boosting ratio of the second boosting process. It can be explained that the voltage of the first output terminal of the backlight power supply greater than the voltage of the second output terminal of the backlight power supply. The first output terminal of the backlight power supply may be the AVDD pin, and the second output terminal of the backlight power supply may be the ELVDD pin.

In combination with the first aspect, in some implementations of the first aspect, the backlight power supply is also used to: step down the electrical signal input to the third input terminal and output the stepped down electrical signal from the third output terminal; wherein , the electrical signal input to the third input terminal of the backlight power supply and the electrical signal input to the input terminal of the boost unit are the same electrical signal.

The voltage of the third input terminal of the backlight power supply is the output voltage of the battery. The backlight power supply can step down the output voltage of the battery and output the stepped down electrical signal from the third output terminal.

Exemplarily, in the example shown in FIG. 4 in the embodiment, the third input end of the backlight power supply is the input pin c, and the third output end of the backlight power supply is the ELVSS pin.

In a second aspect, the present application provides a terminal device, including: a battery, a light emitting device, and a power supply device in any possible implementation manner of the above first aspect.

Description of drawings

FIG. 1 is a schematic structural diagram of a terminal device;

Fig. 2 is a structural schematic diagram of a backlight power supply;

Fig. 3 is a schematic diagram of a power supply device provided by an embodiment of the present application;

Fig. 4 is a schematic diagram of another power supply device provided by the embodiment of the present application;

Fig. 5 is a schematic diagram of another power supply device provided by the embodiment of the present application;

Fig. 6 is a schematic diagram of another power supply device provided by the embodiment of the present application;

Fig. 7 is a schematic diagram of another power supply device provided by the embodiment of the present application;

Fig. 8 is a schematic diagram of another power supply device provided by the embodiment of the present application;

FIG. 9 is a simulation diagram provided by an embodiment of the present application.

Detailed ways

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

In order to clearly describe the technical solutions of the embodiments of the present application, in the embodiments of the present application, words such as "first" and "second" are used to distinguish the same or similar items with basically the same function and effect. Those skilled in the art can understand that words such as "first" and "second" do not limit the quantity and execution order, and words such as "first" and "second" do not necessarily limit the difference.

It should be noted that, in this application, words such as "exemplarily" or "for example" are used as examples, illustrations or illustrations. Any embodiment or design described herein as "exemplary" or "for example" should not be construed as being preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplarily" or "for example" is intended to present related concepts in a concrete manner.

In addition, "at least one" means one or more, and "plurality" means two or more. "And/or" describes the association relationship of associated objects, indicating that there may be three types of relationships, for example, A and/or B, which can mean: A exists alone, A and B exist at the same time, and B exists alone, where A, B can be singular or plural. The character "/" generally indicates that the contextual objects are an "or" relationship. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one (one) of a, b and c may represent: a, or b, or c, or a and b, or a and c, or b and c, or a, b and c, where a, b, c can be single or multiple.

The technical solutions provided in the embodiments of the present application may be applicable to any terminal device including a display screen. For example, mobile phones, tablet computers, personal computers (personal computers, PCs), and smart watches and other wearable terminal devices can also be various teaching aids (such as learning machines, early education machines), smart toys, portable robots, personal digital Assistant (personal digital assistant, PDA), augmented reality technology (augmented reality, AR) equipment, virtual reality (virtual reality, VR) equipment, etc., can also be a device with mobile office function, a device with smart home function, a device with audio-visual Devices with entertainment functions, devices supporting smart travel, etc.

In order to better understand the embodiment of the present application, the hardware structure of the terminal device in the embodiment of the present application is introduced below.

Exemplarily, FIG. 1 shows a schematic structural diagram of a terminal device. As shown in FIG. 1 , the terminal device may include a processor 110, a universal serial bus (universal serial bus, USB) interface 120, a charging management module 130, a power management module 131, a battery 132, a display screen 14, and a backlight power supply 150.

It can be understood that, the structure shown in the embodiment of the present application does not constitute a specific limitation on the terminal device. In other embodiments of the present application, the terminal device may include more or fewer components than shown in the figure, or combine certain components, or separate certain components, or arrange different components. The illustrated components can be realized in hardware, software or a combination of software and hardware.

The processor 110 may include one or more processing units, for example: the processor 110 may include an application processor (application processor, AP), a modem processor, a graphics processing unit (graphics processing unit, GPU), an image signal processor ( image signal processor, ISP), controller, video codec, digital signal processor (digital signal processor, DSP), baseband processor, and/or neural network processor (neural-network processing unit, NPU), etc. Wherein, different processing units may be independent devices, or may be integrated in one or more processors. The controller in the processor 110 can generate an operation control signal according to the instruction operation code and the timing signal, and complete the control of fetching and executing the instruction.

A memory may also be provided in the processor 110 for storing instructions and data. In some embodiments, the memory in processor 110 is a cache memory. The memory may hold instructions or data that the processor 110 has just used or recycled. If the processor 110 needs to use the instruction or data again, it can be recalled from the memory. Repeated access is avoided, and the waiting time of the processor 110 is reduced, thereby improving the efficiency of the system.

In some embodiments, processor 110 may include one or more interfaces. The interface may include an integrated circuit (inter-integrated circuit, I2C) interface, an integrated circuit built-in audio (inter-integrated circuitsound, I2S) interface, a pulse code modulation (pulse code modulation, PCM) interface, a universal asynchronous receiver transmitter (universal asynchronous receiver) /transmitter, UART) interface, mobile industry processor interface (mobile industry processor interface, MIPI), general-purpose input and output (general-purpose input/output, GPIO) interface, subscriber identity module (subscriber identity module, SIM) interface, and/or Universal serial bus (universal serial bus, USB) interface, etc.

The USB interface 120 is an interface conforming to the USB standard specification, specifically, it may be a Mini USB interface, a Micro USB interface, a USB Type C interface, and the like. The USB interface 120 can be used to connect a charger to charge the terminal device, and can also be used to transmit data between the terminal device and peripheral devices. It can also be used to connect headphones and play audio through them. This interface can also be used to connect other terminal devices, such as AR devices.

It can be understood that the interface connection relationship between the modules shown in the embodiment of the present application is a schematic description, and does not constitute a structural limitation on the terminal device. In other embodiments of the present application, the terminal device may also adopt different interface connection modes in the foregoing embodiments, or a combination of multiple interface connection modes.

The charging management module 130 is configured to receive a charging input from a charger. Wherein, the charger may be a wireless charger or a wired charger. In some embodiments of wired charging, the charging management module 130 may receive charging input from the wired charger through the USB interface 120 . In some wireless charging embodiments, the charging management module 130 may receive wireless charging input through a wireless charging coil of the terminal device. While the charging management module 130 is charging the battery 132 , it can also supply power to the terminal device through the power management module 131 .

The power management module 131 is used for connecting the battery 132 , the charging management module 130 and the processor 110 . The power management module 131 receives the input of the battery 132 and/or the charging management module 130 to supply power for the processor 110 , the display screen 140 and the backlight power supply 150 . The power management module 131 can also be used to monitor parameters such as battery capacity, battery cycle times, and battery health status (leakage, impedance). In some other embodiments, the power management module 131 may also be disposed in the processor 110 . In some other embodiments, the power management module 131 and the charging management module 130 may also be set in the same device.

The battery 132 may be a rechargeable lithium battery or other rechargeable batteries, which is not limited in this embodiment of the present application.

The display screen 140 is used for displaying images, displaying videos, receiving sliding operations, and the like. The display screen 140 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 or an active-matrix organic light emitting diode (active-matrix organic light emitting diode). diod, AMOLED), flexible light-emitting diode (flex light-emitting diode, FLED), Miniled, MicroLed, Micro-oLed, quantum dot light-emitting diodes (quantum dotlight emitting diodes, QLED), etc. In some embodiments, the terminal device may include 1 or N display screens 194, where N is a positive integer greater than 1.

The backlight power supply 150 is used to supply power to the display screen 140 . FIG. 2 shows a schematic diagram of the structure of a backlight power supply 150 . As shown in FIG. 2 , the backlight power supply 150 may include a boost module 1 , a buck-boost module and a boost module 2 . The boost module 1 and the boost module 2 are used to boost the input voltage. The buck-boost module can be used to increase or decrease the input voltage. The input pin of the boost module 1 is the LX1 pin, and the output pin of the boost module 1 is the ELVDD pin. The input pins of the buck-boost module include PVIN2A pins, PVIN2B pins, LX2A pins and LX2B pins, and the output pins of the buck-boost module are ELVSS pins. The input pin of the boost module 2 is the LX3 pin, and the output pin of the boost module 2 is the AVDD pin. Wherein, the AVDD pin may be called a power supply pin, which is used to supply power to the outside, and its output voltage is generally 7.6 volts (voltage, V). The ELVDD pin and the ELVSS pin can be collectively referred to as power supply pins. The output voltage of the ELVDD pin is generally 4.6V, and the output voltage of the ELVSS pin is generally -2V to -4V. The LX1 pin, PVIN2A pin, PVIN2B pin, LX2A pin, LX2B pin and LX3 pin of the backlight power supply 150 are all connected to the battery management module 131 .

In the above-mentioned terminal device shown in FIG. 1, the battery 132 can supply power to the backlight power supply 150 through the power management module 131 (also called a charging point chip), but the input voltage of the backlight power supply 150 is 3~4.3V, while the backlight The output of the power supply 150 is 7.6V, 4.6V or -2V, and the backlight power supply 150 needs to input voltage (that is, the LX1 pin, PVIN2A pin, PVIN2B pin, LX2A pin, LX2B pin and LX3 pin of the backlight power supply 150 The corresponding voltage) is adjusted to match the voltage of the output pins (AVDD pin, ELVDD pin, and ELVSS pin), resulting in high power consumption and low efficiency of the backlight power supply 150 .

In view of this, the embodiment of the present application provides a power supply device and terminal equipment, by increasing the input voltage of the backlight power supply to reduce the difference between the output voltage and the input voltage of the backlight power supply, thereby reducing the power consumption of the backlight power supply, which is beneficial to improve Efficiency of the backlight power supply.

In this embodiment of the present application, the terminal device shown in FIG. 1 is taken as an example to introduce the power supply device provided in the embodiment of the present application in detail.

Fig. 3 shows a schematic diagram of a power supply device provided by an embodiment of the present application. As shown in FIG. 3 , the boost unit is respectively connected to the power management module 131 and the backlight power supply 150 , and the battery 132 is connected to the power management module 131 to provide power for the backlight power supply 150 . A boost unit can be used to boost the input voltage. The boost unit can be any chip that can boost voltage.

The voltage output by the battery 132 through the power management module 131 can be represented by VPH-PWR, and the voltage range of VPH-PWR can be 3-4.3V. The input voltage of the boost unit is VPH-PWR. The boost unit can boost the input voltage VPH-PWR, and output the boosted voltage to the backlight power supply 150 . The backlight power supply 150 adjusts the boosted voltage to match the voltage of the output pins (AVDD pin, ELVDD pin and ELVSS pin).

In this case, the voltages of the input pins of the backlight power supply 150 (that is, LX1 pins, PVIN2A pins, PVIN2B pins, LX2A pins, LX2B pins, and LX3 pins) are all increased voltages, and the backlight The difference between the voltage of the output pin of the power supply 150 and the voltage of the input pin can reduce the power consumption of the backlight power supply 150 compared with that before the boost unit does not increase the voltage, which is beneficial to improve the efficiency of the backlight power supply 150 .

Optionally, the voltage output by the boost unit may be lower than the voltage of the ELVDD pin. For example, the voltage output by the boost unit may be less than 4.6V.

The embodiment of the present application also provides a power supply device, which can freely switch the input voltage of the backlight power supply 150 .

Exemplarily, FIG. 4 shows a schematic diagram of another power supply device provided by an embodiment of the present application. As shown in FIG. 4 , the boost unit is connected to the power management module 131 and the backlight power supply 150 respectively, and a switch A is connected in parallel. When the switch A is closed, the boost unit is short-circuited; when the switch A is opened, the boost unit can work. The battery 132 is connected to the power management module 131 and can supply power for the backlight power supply 150 .

The closing and opening of switch A can be determined based on different factors.

In a possible example, the on and off of the switch A may be determined based on the remaining power of the battery 132 .

The switch A can be used to: close when the remaining power of the battery 132 is greater than or equal to a first preset power; open when the remaining power of the battery 132 is less than the first preset power. Wherein, the first preset electric quantity can be a lower electric quantity, for example: the first predetermined electric quantity is 20% or 30%, also can be a higher electric quantity, for example, the first predetermined electric quantity is 60% or 70% %, which is not limited in the embodiment of the present application.

The switch A is used to close when the remaining power of the battery 132 is greater than or equal to the first preset power, and is used to turn off when the remaining power of the battery 132 is less than the first preset power. When the remaining power of the battery 132 is greater than or equal to the first preset power, the switch A is closed, the boost unit is short-circuited, and the input voltage of the backlight power supply 150 is the voltage VPH-PWR output by the battery 132 through the power management module 131 . When the remaining power of the battery 132 is less than the first preset power, the switch A is turned off, and the boost unit is used to boost VPH-PWR, and output the boosted voltage to the backlight power supply 150 .

In this way of implementation, the terminal device can determine whether the switch A is closed or disconnected according to the remaining power of the battery 132, so as to flexibly change the input voltage of the backlight power supply 150, which is beneficial to reduce the power consumption of the backlight power supply 150 under different circumstances, and further It is beneficial to improve the efficiency of the backlight power supply 150 .

In another possible example, the on and off of the switch A may be determined based on the maximum output voltage of the boost unit.

Switch A can be used to: close when the output voltage of the battery 132 is greater than or equal to the maximum output voltage of the boost unit; open when the output voltage of the battery 132 is lower than the maximum output voltage of the boost unit.

The voltage output by the battery 132 through the power management module 131 is VPH-PWR. Switch A is used to close when VPH-PWR is greater than or equal to the maximum output voltage of the boost unit, and is used to open when VPH-PWR is less than the maximum output voltage of the boost unit. When VPH-PWR is greater than or equal to the maximum output voltage of the boost unit, the switch A is closed, the boost unit is short-circuited, and the input voltage of the backlight power supply 150 is VPH-PWR. When VPH-PWR is lower than the maximum output voltage of the boost unit, switch A is turned off, and the boost unit is used to boost VPH-PWR and output the boosted voltage to the backlight power supply 150 .

In this implementation, the terminal device can determine whether the switch A is closed or disconnected according to the voltage value output by the battery 132 through the power management module 131, so as to flexibly change the input voltage of the backlight power supply 150, which is beneficial to reduce the backlight power supply in different situations. The power consumption of the backlight power supply 150 is beneficial to improve the efficiency of the backlight power supply 150 .

In yet another possible example, the closing and opening of the switch A may be determined based on the remaining power of the battery 132 and the maximum output voltage of the boost unit.

When the remaining power of the battery 132 is greater than or equal to the first preset power, or the output voltage of the battery 132 is greater than or equal to the maximum voltage that the boost unit can output; when the remaining power of the battery 132 is less than the first preset power, or the battery 132 is disconnected when the output voltage is lower than the maximum output voltage of the boost unit.

Fig. 5 shows a schematic diagram of a power supply device provided by an embodiment of the present application. As shown in FIG. 5 , the boost unit is respectively connected to the power management module 131 and the input pin a of the backlight power supply 150 , and the power management module 131 is connected to the input pin b and the input pin c of the backlight power supply 150 respectively. The battery 132 is connected to the power management module 131 and can supply power for the backlight power supply 150 . Wherein, the input pin a of the backlight power supply 150 is the input pin corresponding to the AVDD pin, which may be the LX3 pin; the input pin b of the backlight power supply 150 is the input pin corresponding to the ELVDD pin, which may be the LX1 pin; The input pin c of the backlight power supply 150 is the input pin corresponding to the ELVSS pin, and may include the PVIN2A pin, the PVIN2B pin, the LX2A pin and the LX2B pin.

The voltage output by the battery 132 through the power management module 131 can be VPH-PWR, then the input voltage of the boost unit is VPH-PWR, and the voltages of the input pins b and c of the backlight power supply 150 are VPH-PWR. The boost unit can boost the input voltage VPH-PWR, and output the boosted voltage to the input pin a of the backlight power supply 150 . The backlight power supply 150 can adjust the boosted voltage to match the voltage of the AVDD pin, and adjust VPH-PWR to match the voltage of the ELVDD pin and the ELVSS pin.

In this case, the voltage of the input pin a of the backlight power supply 150 is a boosted voltage, and the voltage difference between the voltage of the input pin a and the AVDD pin is smaller than the voltage difference before the boost unit does not boost the voltage , the power consumption of the backlight power supply 150 can be reduced, which is beneficial to improve the efficiency of the backlight power supply 150 .

Optionally, the voltage output by the boost unit may be lower than the voltage of the AVDD pin. For example, the voltage output by the boost unit may be less than 7.6V.

The embodiment of the present application also provides a power supply device, which can freely switch the input voltage of the input pin a of the backlight power supply 150 .

Exemplarily, FIG. 6 shows a schematic diagram of a power supply device provided by an embodiment of the present application. As shown in FIG. 6 , the boost unit is respectively connected to the input pin a of the power management module 131 and the backlight power supply 150 , and the switch B is connected in parallel. When the switch B is closed, the boost unit is short-circuited; when the switch B is opened, the boost unit can work. The power management module 131 is respectively connected to the input pin b and the input pin c of the backlight power supply 150 . The battery 132 is connected to the power management module 131 and can supply power for the backlight power supply 150 . The switch B can be used to close when the remaining power of the battery 132 is greater than or equal to a first preset power, and to be turned off when the remaining power of the battery 132 is less than the first preset power. Alternatively, the switch B can be used to: close when the output voltage of the battery 132 is greater than or equal to the maximum output voltage of the boost unit; open when the output voltage of the battery 132 is lower than the maximum output voltage of the boost unit.

The voltage output by the battery 132 through the power management module 131 may be VPH-PWR. When the switch B is closed, the boost unit is short-circuited, and the input voltages of the input pin a, the input pin b and the input pin c of the backlight power supply 150 are all VPH-PWR. When the switch B is turned off, the boost unit is used to boost VPH-PWR, and output the boosted voltage to the input pin a of the backlight power supply 150 . The backlight power supply 150 can adjust the boosted voltage to match the voltage of the AVDD pin, and adjust VPH-PWR to match the voltage of the ELVDD pin and the ELVSS pin.

This implementation method can reduce the voltage difference between the input pin a of the backlight power supply and the AVDD pin, which is beneficial to reducing the power consumption of the backlight power supply, saving power consumption, and prolonging the use time of the backlight power supply.

Fig. 7 shows a schematic diagram of a power supply device provided by an embodiment of the present application. As shown in FIG. 7 , the boost unit is respectively connected to the power management module 131 , the input pin a of the backlight power supply 150 and the input pin b of the backlight power supply 150 , and the power management module 131 is connected to the input pin c of the backlight power supply 150 . The battery 132 is connected to the power management module 131 and can supply power for the backlight power supply 150 .

The voltage output by the battery 132 through the power management module 131 can be VPH-PWR, then the input voltage of the boost unit is VPH-PWR, and the voltage of the input pin c of the backlight power supply 150 is VPH-PWR. The boost unit can boost the input voltage VPH-PWR, and output the boosted voltage to the input pin a of the backlight power supply 150 . The backlight power supply 150 can adjust the boosted voltage to match the voltage of the AVDD pin and the ELVDD pin, and adjust VPH-PWR to match the voltage of the ELVSS pin.

In this case, the voltages of the input pin a and the input pin b of the backlight power supply 150 are boosted voltages, and the voltage difference between the voltage of the input pin a and the AVDD pin is smaller than that of the boost unit without boosting The voltage difference before the voltage, the voltage difference between the voltage of the input pin b and the ELVDD pin is smaller than the voltage difference before the boost unit does not raise the voltage, which can reduce the power consumption of the backlight power supply 150, and is beneficial to improve the power consumption of the backlight power supply 150. efficiency.

Optionally, the voltage output by the boost unit may be lower than the voltage of the ELVDD pin. For example, the voltage output by the boost unit may be less than 4.6V.

The embodiment of the present application also provides a power supply device, which can freely switch the input voltage of the input pin a and the input pin b of the backlight power supply 150 .

Exemplarily, FIG. 8 shows a schematic diagram of a power supply device provided by an embodiment of the present application. As shown in FIG. 8 , the boost unit is respectively connected to the power management module 131 , the input pin a of the backlight power supply 150 and the input pin b of the backlight power supply 150 , and the switch C and the switch D are connected in parallel. When at least one of the switch C and the switch D is closed, the boost unit is short-circuited; when both the switch C and the switch D are turned off, the boost unit can work. The power management module 131 is connected to the input pin c of the backlight power supply 150 . The battery 132 is connected to the power management module 131 and can supply power for the backlight power supply 150 .

It should be noted that in this example, the states of switch C and switch D are the same, that is, both switch C and switch D are closed or both are open, there is no switch C closed and switch D open, or switch C open and switch D is closed.

If both the switch C and the switch D are turned off, the input voltage of the input pin a and the input pin b of the backlight power supply 150 is the voltage boosted by the boost unit. When both the switch C and the switch D are turned off, the power consumption of the backlight power supply 150 that can be reduced by the power supply device shown in FIG. 8 is the same as the power consumption that can be reduced by the power supply device shown in FIG. 7 above.

If both the switch C and the switch D are closed, the boost unit is short-circuited, and the input voltages of the input pin a, the input pin b and the input voltage c of the backlight power supply 150 are the voltage VPH-PWR output by the battery 132 through the power management module 131 .

The states of the switch C and the switch D may be determined according to the remaining power of the battery 132, or may be determined according to the maximum output voltage of the boost unit.

In a possible implementation manner, the states of the switch C and the switch D may be determined according to the remaining power of the battery 132 .

Exemplarily, switch C and switch D can be used to close when the remaining power of the battery 132 is greater than or equal to the second preset power, and can be used to turn off when the remaining power of the battery 132 is less than the second preset power. Wherein, the second preset electric quantity may be the same as or different from the above-mentioned first predetermined electric quantity, which is not limited in this application.

If the second preset power is different from the first preset power, when the first preset power is a lower power, the second preset power may be lower than the first preset power. When the first preset electric quantity is a relatively high electric quantity, the second predetermined electric quantity may be higher than the first predetermined electric quantity.

Exemplarily, if the first preset electricity is 20%, the second preset electricity may be 15%. If the first preset power is 60%, the second preset power may be 70%.

If the voltage of the battery 132 is greater than or equal to the second preset electric quantity, it can be explained that the remaining electric quantity of the battery 132 is sufficient. At this time, both the switch C and the switch D are closed, the boost unit is short-circuited, and the input pins a and input pins of the backlight power supply 150 The voltage of b and the input pin c are both VPH-PWR. If the voltage of the battery 132 is lower than the second preset electric quantity, it can be explained that the remaining electric quantity of the battery 132 is insufficient. At this time, both the switch C and the switch D are turned off, and the boost unit is used to increase the VPH-PWR, and supply the voltage to the backlight power supply 150. The input pin a and the input pin b output the boosted voltage to reduce the voltage difference between the input pin a and the AVDD pin and the voltage difference between the input pin b and the ELVDD pin.

In this implementation, the terminal device can determine whether the switch C and the switch D are closed or disconnected according to the remaining power of the battery 132, so as to flexibly change the input voltages of different input pins of the backlight power supply 150, which is beneficial when the remaining power of the battery 132 is insufficient. In the case of , reducing the power consumption of the backlight power supply 150 is beneficial to improving the efficiency of the backlight power supply 150 .

In another possible implementation manner, the states of the switch C and the switch D may be determined according to the maximum output voltage of the boost unit. Wherein, the maximum voltage that the boost unit can output may be the maximum voltage value that the boost unit can boost. For example, the maximum output voltage of the boost unit is 4V, 4.3V or 4.6V and so on.

Exemplarily, switch C and switch D can be used to close when the input voltage VPH-PWR of the boost unit is greater than or equal to the maximum output voltage of the boost unit, and to be closed when the input voltage VPH-PWR of the boost unit is less than the boost voltage VPH-PWR. disconnect when the voltage unit is capable of outputting the maximum voltage.

If the input voltage VPH-PWR of the boost unit is greater than or equal to the maximum output voltage of the boost unit, it can be explained that the boost unit does not need to boost the voltage. At this time, both switch C and switch D are closed, the boost unit is short-circuited, and the backlight power supply 150 The voltages of input pin a, input pin b and input pin c are all VPH-PWR. If the input voltage VPH-PWR of the boost unit is less than the maximum output voltage of the boost unit, it can be explained that the boost unit can boost the voltage. At this time, both switch C and switch D are turned off, and the boost unit is used to convert VPH-PWR increase, and output the increased voltage to the input pin a and the input pin b of the backlight power supply 150, so as to reduce the voltage difference between the input pin a and the AVDD pin and the voltage difference between the input pin b and the ELVDD pin .

In this implementation, the terminal device can determine whether the switch C and the switch D are closed or opened according to the voltage value output by the battery 132 through the power management module 131, so as to flexibly change the input voltage of the backlight power supply 150, which is beneficial in different situations. Reducing the power consumption of the backlight power supply 150 is beneficial to improving the efficiency of the backlight power supply 150 .

In order to verify that the power supply device provided by the embodiment of the present application improves the efficiency of the backlight power supply, the embodiment of the present application simulates the power supply device shown in FIG. 5 above.

Exemplarily, Fig. 9 shows a simulation diagram. As shown in FIG. 9 , in the above example shown in FIG. 5 , the input voltages provided by the embodiment of the present application for the input pin a of the backlight power supply are 2.5V, 3.3V, 3.8V, 4.35V and 4.8V respectively. It can be seen from the figure that the higher the voltage of the input pin a of the backlight power supply, the higher the efficiency of the backlight power supply. In the power supply device provided by the embodiment of the present application, the efficiency of the backlight power supply can be improved by increasing the input voltage of the backlight power supply through the boost unit.

An embodiment of the present application also provides a terminal device, where the terminal device may include a battery, a light emitting device, and any power supply device described above.

Those skilled in the art can appreciate that the modules and algorithm steps of the examples described in conjunction with the embodiments disclosed herein can be implemented by electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are executed by hardware or software depends on the specific application and design constraints of the technical solution. Skilled artisans may use different methods to implement the described functions for each specific application, but such implementation should not be regarded as exceeding the scope of the present application.

Those skilled in the art can clearly understand that for the convenience and brevity of the description, the specific working process of the above-described system, device, and module can refer to the corresponding process in the foregoing method embodiment, and details are not repeated here.

In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods may be implemented in other ways. For example, the device embodiments described above are only illustrative. For example, the division of the modules is only a logical function division. In actual implementation, there may be other division methods. For example, multiple modules or components can be combined or May be integrated into another system, or some features may be ignored, or not implemented. In another point, the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces, and the indirect coupling or communication connection of devices or modules may be in electrical, mechanical or other forms.

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

In addition, each functional module in each embodiment of the present application may be integrated into one processing module, each module may exist separately physically, or two or more modules may be integrated into one module.

If the functions are implemented in the form of software function modules and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art or the part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including Several instructions are used to make a computer device (which may be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage media include: U disk, mobile hard disk, read-only memory (read-only memory, ROM), random access memory (random access memory, RAM), magnetic disk or optical disk and other media that can store program codes. .

The above is only the specific implementation of the application, but the protection scope of the embodiment of the application is not limited thereto, and any skilled person familiar with the technical field can easily think of changes within the technical scope disclosed in the embodiment of the application Or replacement, should be covered within the scope of protection of the embodiments of the present application. Therefore, the scope of protection of the embodiments of the present application should be based on the scope of protection of the claims.

Claims (3)

1. A power supply device, characterized in that it comprises: a boost unit, a first switch, a second switch and a backlight power supply, the boost unit is used for boosting the electrical signal input at the input terminal and from the first The output terminal outputs the boosted electrical signal, and is also used to output the boosted electrical signal from the second output terminal. An output terminal outputs a boosted electrical signal, and is also used to perform a second boosting process on the electrical signal input from the second input terminal and output the boosted electrical signal from the second output terminal. The first boosting process The boosting ratio is greater than the boosting ratio of the second boosting process; Wherein, the input terminal of the boost unit is used to connect to a power management module, the power management module is connected to the battery, the first output terminal of the boost unit is connected to the first input terminal of the backlight power supply, and the The second output end of the boost unit is connected to the second input end of the backlight power supply, the first output end of the backlight power supply is used to connect the light emitting device, the first end of the first switch is connected to the second input end of the boost unit connected to the input end of the first switch, the second end of the first switch is connected to the first input end of the backlight power supply, the first end of the second switch is connected to the input end of the boost unit, and the second The second end of the switch is connected to the second input end of the backlight power supply, the first output end of the backlight power supply is the AVDD pin, and the second output end of the backlight power supply is the ELVDD pin; The power supply device also includes a control unit, the control unit is used for: detecting the remaining power of the battery; When the remaining power of the battery is greater than or equal to a second preset power, controlling the first switch and the second switch to be closed; When the remaining power of the battery is less than the second preset power, controlling the first switch and the second switch to be turned off; Alternatively, the control unit is used for: detecting the output voltage of the battery; When the output voltage of the battery is greater than or equal to the maximum output voltage of the boost unit, the first switch and the second switch are controlled to be closed. 2. The power supply device according to claim 1, wherein the backlight power supply is further used for: performing step-down processing on the electrical signal input from the third input end and outputting the reduced-voltage electrical signal from the third output end ; Wherein, the electrical signal input to the third input end of the backlight power supply and the electrical signal input to the input end of the boost unit are the same electrical signal. 3. A terminal device, characterized by comprising: a battery, a light emitting device, and the power supply device according to any one of claims 1-2.

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