WO2023143381A1 - Flash lamp circuit, control method, electronic device, and readable storage medium - Google Patents

Abstract

A flash lamp circuit, a control method, an electronic device, and a readable storage medium, which belong to the technical field of communications. The flash lamp circuit comprises: a driving chip (10) and an input power supply (11), a first power supply module (12), and a flash lamp module (13) that are connected to the driving chip (10). The driving chip (10) is used when the voltage of the input power supply (11) is greater than a voltage threshold to: in a first period of time within a voltage reduction period, drive the input power supply (11) to charge the first power supply module (12) and drive the input power supply (11) to supply power to the flash lamp module (13); and drive the first power supply module (12) to supply power to the flash lamp module (13) in a second period of time within the voltage reduction period.

Description

Flash lamp circuit, control method, electronic device and readable storage medium

Cross References to Related Applications

This application claims priority to Chinese Patent Application No. 202210087146.9 filed in China on January 25, 2022, the entire contents of which are hereby incorporated by reference.

technical field

The application belongs to the technical field of communication, and in particular relates to a flashlight circuit, a control method, electronic equipment and a readable storage medium.

Background technique

At present, the shooting function has become an indispensable function of the electronic equipment, and when the electronic equipment is used for shooting under low-light conditions, the flashlight, as an important auxiliary peripheral, is more and more widely used in the electronic equipment.

Usually, the electronic device can convert the voltage of the system power supply to the voltage required for the flash lamp to work through a driver chip, and control the flash lamp to work in different modes according to different voltage values of the system power supply.

However, according to the above-mentioned method, when the voltage value of the above-mentioned system power supply is relatively large, since the power loss of the above-mentioned driver chip is also relatively large, and the power loss is directly dissipated on the driver chip in the form of heat, it may cause The over-temperature protection function of the driver chip is triggered, so that the flash cannot continue to work, thereby affecting the user experience.

Contents of the invention

The purpose of the embodiment of the present application is to provide a flashlight circuit, a control method, an electronic device and a readable storage medium, which can solve the problem that the flashlight cannot continue to work when the voltage value of the system power supply is large.

In the first aspect, the embodiment of the present application provides a flashlight circuit, the flashlight circuit includes: a driver chip, an input power supply connected to the driver chip, a first power supply module, and a flashlight module; When the voltage is greater than the threshold value: in the first time period of a step-down cycle, drive the input power to charge the first power module, and drive the input power to supply power to the flash module; in the second time period of a step-down cycle segment, driving the first power supply module to supply power to the flashlight module.

In a second aspect, an embodiment of the present application provides an electronic device, the electronic device includes the flashlight circuit as described in the first aspect.

In a third aspect, an embodiment of the present application provides a method for controlling a flash lamp, which is applied to the flash lamp circuit described in the first aspect, and the method includes: when the voltage of the input power supply in the flash lamp circuit is greater than a voltage threshold value: In the first period of time in a step-down cycle, the first power supply module in the flash circuit is charged by the input power supply, and the flash module in the flash circuit is powered; in the second period of time in a step-down cycle, the first A power supply module supplies power to the flashlight module.

In a fourth aspect, the embodiment of the present application provides an electronic device, the electronic device includes a processor and a memory, the memory stores programs or instructions that can run on the processor, and the programs or instructions are processed by the Implemented when the device executes The steps of the method as described in the third aspect.

In the fifth aspect, the embodiment of the present application provides a readable storage medium, on which a program or instruction is stored, and when the program or instruction is executed by a processor, the steps of the method as described in the third aspect are implemented .

In the sixth aspect, the embodiment of the present application provides a chip, the chip includes a processor and a communication interface, the communication interface is coupled to the processor, and the processor is used to run programs or instructions, to achieve the third aspect the method described.

In a seventh aspect, an embodiment of the present application provides a computer program product, where the program product is stored in a storage medium, and the program product is executed by at least one processor to implement the method as described in the third aspect.

In the embodiment of the present application, the flashlight circuit may include: a driver chip, and an input power supply connected to the driver chip, a first power supply module, and a flashlight module; Situation: In the first time period of a step-down cycle, drive the input power to charge the first power supply module, and drive the input power to supply power to the flash module; in the second time period of a step-down cycle, drive the first power supply The module powers the flash module. Through the flashlight circuit, since the voltage of the input power supply of the flashlight circuit is greater than the voltage threshold value, the driver chip can firstly charge the first power supply module through the input power supply and charge the flashlight module through the input power supply in a step-down cycle. power supply, and then supply power to the flashlight module separately through the first power supply module, so it can ensure that the output voltage of the flashlight circuit is always kept at the minimum value when the input power supply voltage is relatively high, so that the power loss of the driver chip is minimized , which in turn ensures that the flash is working properly.

Description of drawings

FIG. 1 is one of the structural schematic diagrams of a flashlight circuit provided by an embodiment of the present application;

Fig. 2 is the second structural schematic diagram of a flashlight circuit provided by the embodiment of the present application;

Fig. 3 is the third structural schematic diagram of a flashlight circuit provided by the embodiment of the present application;

FIG. 4 is the fourth structural schematic diagram of a flashlight circuit provided by an embodiment of the present application;

Fig. 5 is the fifth structural schematic diagram of a flashlight circuit provided by the embodiment of the present application;

Fig. 6 is the sixth structural schematic diagram of a flashlight circuit provided by the embodiment of the present application;

Fig. 7 is the seventh structural schematic diagram of a flashlight circuit provided by the embodiment of the present application;

Fig. 8 is the eighth structural schematic diagram of a flashlight circuit provided by the embodiment of the present application;

FIG. 9 is the ninth schematic structural diagram of a flashlight circuit provided by an embodiment of the present application;

Fig. 10 is the tenth structural schematic diagram of a flashlight circuit provided by the embodiment of the present application;

FIG. 11 is a flow chart of a flashlight control method provided in an embodiment of the present application;

Fig. 12 is a schematic diagram of an electronic device provided by an embodiment of the present application;

FIG. 13 is a schematic diagram of hardware of an electronic device provided by an embodiment of the present application.

Detailed ways

The following will clearly describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, but not all of them. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments in this application belong to the protection scope of this application.

The terms "first", "second", etc. in the specification and claims of this application are used to distinguish similar objects, It is not intended to describe a particular order or sequence. It should be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the application can be practiced in sequences other than those illustrated or described herein, and that references to "first,""second," etc. distinguish Objects are generally of one type, and the number of objects is not limited. For example, there may be one or more first objects. In addition, "and/or" in the specification and claims means at least one of the connected objects, and the character "/" generally means that the related objects are an "or" relationship.

The flashlight circuit, control method, electronic device and readable storage medium provided by the embodiments of the present application will be described in detail below through specific embodiments and application scenarios with reference to the accompanying drawings.

As an important auxiliary peripheral when shooting, the flash is widely used in mobile terminals such as mobile phones. On the one hand, in order to obtain better shooting effects, mobile terminals have higher and higher requirements for the brightness of the flashlight; on the other hand, because users have higher and higher aesthetic requirements for the design of mobile terminals, the screen openings corresponding to the flashlights are being used. The design is small; thus the mobile terminal can only increase the current passing through the flashlight in order to ensure the expected brightness of the flashlight. Usually, in order to ensure that the flashlight can emit the expected brightness, the voltage and current of the flashlight must be kept constant. However, since the input power is generally connected to the battery terminal, its voltage is not constant. Specifically, when the voltage of the input power supply is less than or equal to a voltage threshold value, no matter how it changes, the driver chip can ensure the power consumption of the driver chip by adjusting the duty cycle of different switching elements in the driver chip. minimum. When the voltage of the input power source is greater than the voltage threshold value, the driver chip can no longer ensure the minimum power loss of the driver chip by adjusting the duty cycle of different switching elements in the driver chip. Voltage and current, the power loss of the driver chip is also increasing. Since the power loss is directly dissipated on the driver chip in the form of heat, on the one hand, the energy conversion efficiency of the driver chip will be reduced, which will affect the user's use time; on the other hand, the temperature of the driver chip will be too high , may lead to over-temperature protection of the driver chip, so that the flash cannot continue to work, thereby affecting the user experience.

In order to solve the above problems, in the flashlight circuit of the embodiment of the present application, the driver chip can be used to drive the input power to be The first power supply module charges and drives the input power supply to supply power to the flashlight module; in the second time period of a step-down cycle, drives the first power supply module to supply power to the flashlight module. Through the flashlight circuit, when the voltage of the input power supply of the flashlight circuit is greater than the voltage threshold value, since the driver chip can separately drive the input power supply and the first power supply module in two different time periods within a step-down cycle, The flashlight module is powered, so when the voltage of the input power supply is high, the output voltage of the flashlight circuit can be kept at a minimum value, so that the power loss of the driver chip is minimized, and the flashlight can work normally.

An embodiment of the present application provides a flashlight circuit, and FIG. 1 shows a schematic structural diagram of a flashlight circuit provided in the embodiment of the present application. As shown in FIG. 1 , the flashlight circuit provided by the embodiment of the present application may include a driver chip 10 , and an input power supply 11 connected to the driver chip 10 , a first power supply module 12 and a flashlight module 13 .

In the embodiment of this application, the driver chip can be used to drive the input power to charge the first power module and drive the input The power supply supplies power to the flashlight module; in a second period of time within a step-down cycle, the first power supply module is driven to supply power to the flashlight module.

Optionally, in this embodiment of the present application, the voltage threshold may be the minimum value of the output voltage of the flash circuit.

Optionally, in the embodiment of the present application, the minimum value of the output voltage of the flashlight circuit may be the sum of the voltage required for normal operation of the flashlight module (for example, the rated voltage) and the minimum voltage drop on the driver chip.

In the embodiment of the present application, the duration of the above-mentioned one step-down period is the sum of the duration of the first time period and the duration of the second time period. That is, a pressure drop period is composed of a first time period and a second time period.

It can be understood that, within a depressurization cycle, the end moment of the first time period is shorter than the start moment of the second time period.

In the embodiment of the present application, the duration of the above-mentioned step-down cycle is a fixed duration, and the duration of the first time period and the duration of the second time period can be determined according to the ratio between the voltage of the input power supply and the voltage threshold.

Exemplarily, assuming that the first duty cycle D ₁ = the first time period: step-down period, then: the first duty cycle D ₁ , the voltage threshold value V _th and the voltage V _PH of the input power satisfy the following formula (1):

V _th =D ₁ *V _PH ; (1)

Wherein, 0≤D ₁ <1.

It can be understood that after the above step-down cycle ends, the driver chip can drive the input power supply to charge the first power module in the first time period of the next step-down cycle when the voltage of the input power supply is greater than the voltage threshold value. , and drive the input power supply to supply power to the flashlight module; and drive the first power supply module to supply power to the flashlight module during the second period of time in the next step-down cycle. That is, the driver chip can drive the input power to charge the first power module and drive the input power to supply power to the flashlight module in the first time period of each step-down cycle; and in the second time period of each step-down cycle, Driving the first power supply module to supply power to the flashlight module.

Optionally, in this embodiment of the present application, the first power module may be an inductance element.

It can be understood that the driver chip drives the inductance element in the boost circuit of the flash circuit as a separate power supply for the flash module during the first period of time in each step-down cycle, so that the output voltage of the flash circuit can be avoided from changing with the input power supply. The increase of the voltage continues to increase, so that the power consumption of the driver chip can be reduced.

In the embodiment of the present application, the input power supply may be used to: charge the first power supply module under the drive of the driver chip; or supply power to the flashlight module.

In the embodiment of the present application, the first power supply module may be used to: be charged by an input power supply under the drive of the driver chip; or, supply power to the flashlight module.

The flashlight circuit provided by the embodiment of the present application will be exemplarily described below with reference to the accompanying drawings.

Exemplarily, referring to FIG. 1, if the voltage of the input power source 11 is greater than the voltage threshold value, the flashlight circuit can operate in a step-down (Buck) mode, and the step-down mode can include at least one step-down cycle, each step-down Each cycle includes two power supply modes, mode 1 and mode 2 respectively. Wherein, mode 1 is: in the first period of time in each step-down cycle, the input power supply 11 can charge the first power supply module 12 under the drive of the driver chip 10, and supply power to the flashlight module 13; mode 2 is: In the second period of each step-down period, the first power supply module 12 can supply power to the flashlight module 13 driven by the driving chip 10 . In this way, in the step-down mode, through the alternation of the two power supply modes, the output voltage of the flashlight circuit can be maintained stable (for example, the output voltage is kept at a minimum value) when the input power supply voltage is relatively high, thereby maintaining the flashlight circuit The output current of the flashlight is stabilized, thereby minimizing the power loss of the driver chip in the flashlight circuit, so as to ensure that the flashlight can work normally.

Optionally, in this embodiment of the present application, referring to FIG. 1, as shown in FIG. Four switching tubes Q4. The microprocessor 14 is respectively connected to the control terminal of the first switching tube Q1 (indicated by c1 in FIG. 2 ), the control terminal of the second switching tube Q2 (indicated by c2 in FIG. 2) is connected to the control end of the fourth switching tube Q4 (shown as c4 in FIG. 2 ); the first end of the first switching tube Q1 (shown as a1 in FIG. 2 ) is connected to the positive pole of the input power supply 11, The second end of the first switching tube Q1 (indicated by b1 in FIG. 2 ) is connected to the first end of the second switching tube Q2 (indicated by a2 in FIG. 2 ) and the first end of the first power module 12 (in FIG. 2 denoted by a), the first end of the third switch tube Q3 (shown by a3 in FIG. The first end of the switch tube Q4 (indicated by a4 in FIG. 2 ) is connected to the second end (indicated by b in FIG. 2 ) of the first power module 12, and the second end of the second switch tube Q2 (indicated by b2 in FIG. 2 ), the second end of the fourth switching tube Q4 (shown as b4 in FIG. 2 ), the negative pole of the flashlight module 13 and the negative pole of the input power supply 11 are all grounded.

In the embodiment of the present application, the microprocessor can be used to control the third switching tube to turn on and control the fourth switching tube to turn off when the voltage of the input power supply is greater than the voltage threshold value; In the case of on and the fourth switching tube is off: in the first time period, by controlling the first switching tube to be on and controlling the second switching tube to be off, the input power supply is driven to charge the first power module, and the input power supply is driven to The power supply supplies power to the flashlight module; or, in the second time period, the first power supply module is driven to supply power to the flashlight module by controlling the first switch tube to be turned off and the second switch tube to be turned on. In this way, the driver chip can separately drive the first power module and the input power to supply power for the flashlight module through the microprocessor in two different time periods within a step-down cycle.

Optionally, in the embodiment of the present application, the switch transistor may be any possible switch transistor such as a switch triode or a field effect transistor.

It should be noted that the microprocessor can control the switch tube to be turned on or off by sending a control signal to the switch tube.

In the flashlight circuit provided in the embodiment of the present application, when the voltage of the input power supply of the flashlight circuit is greater than the voltage threshold value, the driver chip can first charge the first power supply module through the input power supply in one step-down cycle, and The flashlight module is powered by the input power supply, and then the flashlight module is powered solely by the first power supply module, so that the output voltage of the flashlight circuit can always be kept at a minimum value when the input power supply voltage is relatively high, so that the The power loss of the driver chip is minimal, which in turn ensures that the flash can work normally.

Optionally, in the embodiment of the present application, referring to FIG. 1 , as shown in FIG. 3 , the flash circuit provided in the embodiment of the present application may further include a second power module 15 connected to the above-mentioned driving chip 10 .

In the embodiment of the present application, the driving chip can also be used to drive the input power supply to charge the first power supply module during the third period of time in a boost cycle when the voltage of the input power supply is less than or equal to the voltage threshold value, And drive the second power supply module to supply power to the flashlight module; in the fourth period of time within a boost cycle, drive the input power supply and the first power supply module to supply power to the flashlight module, and drive the input power supply and the first power supply module to serve as the second power supply module Charge.

In the embodiment of the present application, the duration of the above-mentioned one boost cycle is the sum of the duration of the third time period and the duration of the fourth time period. That is, the boost cycle is composed of a third time period and a fourth time period.

It can be understood that, within a boost cycle, the end moment of the third time period is shorter than the start moment of the fourth time period.

In the embodiment of the present application, the duration of one boost cycle is a fixed duration, and the duration of the third time period and the fourth time period can be determined according to the ratio between the voltage of the input power supply and the voltage threshold.

Exemplarily, assuming that the second duty ratio D ₂ = the third time period: boost cycle, then: the second duty ratio D ₂ , the voltage threshold value V _th and the voltage V _PH of the input power satisfy the following formula (2):

Wherein, 0≦D ₂ <1.

It can be understood that after the above-mentioned one boost cycle ends, the driver chip can drive the input power to the first power supply in the third period of time in the next boost cycle when the voltage of the input power is less than or equal to the voltage threshold value. The module is charged, and the second power supply module is driven to supply power to the flashlight module; in the fourth period of time in the next boost cycle, the input power supply and the first power supply module are driven to supply power to the flashlight module, and the input power supply and the first power supply module are driven to supply power to the second power supply module. Two power modules are charged. That is, the driver chip can drive the input power supply to charge the first power module during the third time period of each boost cycle, and drive the second power module to supply power to the flashlight module; and during the second time period of each step-down cycle, The input power supply and the first power supply module are driven to supply power to the flashlight module, and the input power supply and the first power supply module are driven to charge the second power supply module.

Optionally, in the embodiment of the present application, the second power module may include a capacitive element.

Optionally, in this embodiment of the application, when the driver chip drives the input power and the first power module to supply power to the flashlight module, and drives the input power and the first power module to charge the second power module, the driver chip can drive the input power and The first power modules are connected in series. In this way, the input voltage of the flashlight circuit can be the sum of the voltage of the input power supply and the voltage of the first power supply module, thereby ensuring that the output voltage of the flashlight circuit is greater than the voltage of the input power supply, so that the output voltage of the flashlight circuit can meet the voltage of the flashlight module need.

In the embodiment of the present application, the input power supply can be used to charge the first power supply module under the drive of the driver chip; or, supply power to the flashlight module and charge the second power supply module.

In the embodiment of the present application, the first power supply module can be used to charge the flashlight module and charge the second power supply module under the drive of the driver chip: charging through the input power supply.

In the embodiment of the present application, the second power supply module can be used to supply power to the flashlight module under the drive of the driver chip; or, to charge through the input power supply and the first power supply module.

The flashlight circuit provided by the embodiment of the present application will be exemplarily described below with reference to the accompanying drawings.

Exemplarily, referring to FIG. 3 , if the voltage of the input power supply 11 is less than or equal to the voltage threshold value, the flashlight circuit operates in a boost (Boost) mode, and the boost mode may include at least one boost cycle, each boost Each voltage cycle includes two power supply modes, namely mode 3 and mode 4. Wherein, the mode 3 is: in the third period of time in each boost cycle, the input power source 11 can be driven by the driver chip 10, to charge the first power module 12; Driven to supply power to the flashlight module 13; mode 4 is: in the fourth time period of each boost cycle, the input power supply 11 and the first power supply module 12 can be driven by the driver chip 10 to supply power to the flashlight module 13 and Charge the second power module 15 . In this way, in the boost mode, by alternately performing the two power supply modes, the output voltage of the flashlight circuit can be kept stable (for example, keep the output voltage at a minimum value) when the voltage of the input power supply is small, thereby maintaining the flashlight The stability of the output current of the circuit makes the power loss of the driver chip in the flash circuit the lowest small to ensure that the flash will work properly.

It should be noted that, when the voltage of the input power supply is less than or equal to the voltage threshold value, the flashlight circuit can increase the output voltage of the flashlight circuit by operating in boost mode, so as to ensure that the output voltage of the flashlight circuit is always maintained at minimum value; and when the voltage of the input power supply is greater than the voltage threshold value, by multiplexing the first power supply module in the boost mode, specifically driving the first voltage module in the first time period to supply power for the power flashlight module alone, And in the second time period, the input power is driven to supply power to the power flashlight module alone, and the output voltage of the flashlight circuit is reduced to ensure that the output voltage of the flashlight circuit is always kept at a minimum value. In this way, no matter how the voltage of the input power source changes, the output voltage of the flashlight circuit can always be kept at a minimum value, thereby reducing the power consumption of the driver chip, increasing the working time of the flashlight module, and improving user experience.

Optionally, in this embodiment of the present application, referring to FIG. 3, as shown in FIG. Four switching tubes Q4; the microprocessor 14 is respectively connected to the control terminal of the first switching tube Q1 (shown by c1 in FIG. 4 ), the control terminal of the second switching tube Q2 (shown by c2 in FIG. 4 ), and the third switching tube Q3 The control terminal (indicated by c3 in FIG. 4 ) is connected to the control terminal (indicated by c4 in FIG. 4 ) of the fourth switching tube Q4; the first end (indicated by a1 in FIG. 4 ) of the first switching tube Q1 is connected to the input power supply 11, the second end of the first switching tube Q1 (indicated by b1 in FIG. 4 ) is connected with the first end of the second switching tube Q2 (indicated by a2 in FIG. 4 ) and the first end of the first power module 12 (represented by a in FIG. 4 ) connection, the first end of the third switching tube Q3 (represented by a3 in FIG. 4 ) is connected to the positive pole of the flashlight module 13 and the positive pole of the second power supply module 15, and the first end of the third switching tube Q3 The two terminals (shown by b3 in FIG. 4 ) are connected with the first end (shown by a4 in FIG. 4 ) of the fourth switch tube Q4 and the second end (shown by b in FIG. 4 ) of the first power module 12 , and the second The second end of the switch tube Q2 (shown by b2 in FIG. 4 ), the second end of the fourth switch tube Q4 (shown by b4 in FIG. 4 ), the negative pole of the flashlight module 13, the negative pole of the input power supply 11 and the second power supply module 15 negative poles are all grounded.

In the embodiment of the present application, the microprocessor can be used to control the first switching tube to be turned on and the second switching tube to be turned off when the voltage of the input power supply is less than or equal to the voltage threshold value, and the first switching tube When it is turned on and the second switch is turned off: in the third time period, by controlling the third switch to be turned off and the fourth switch to be turned on, the input power is driven to charge the first power module and drive the second The second power supply module supplies power to the flashlight module; or, in the fourth time period, by controlling the third switch tube to be turned on and the fourth switch tube to be turned off, the input power supply and the first power supply module are driven to supply power to the flashlight module, and the input The power supply and the first power module charge the second power module. This ensures that the output voltage of the flash circuit is kept to a minimum.

In the flashlight circuit provided by the embodiment of the present application, when the voltage of the input power supply of the flashlight circuit is less than or equal to the voltage threshold value, since the driver chip can control the first switch tube to be turned on and the second switch tube to be turned off, And when the first switch tube is turned on and the second switch tube is turned off: through the third time period in each boost cycle, drive the input power to charge the first power module, and drive the second power module to be The flashlight module supplies power; and in the fourth period of each boost cycle, the input power supply and the first power supply module are driven to supply power to the flashlight module, and the input power supply and the first power supply module are driven to charge the second power supply module, which improves The output voltage of the flash circuit, so it can ensure that the output voltage of the flash circuit is kept at a minimum value, thereby ensuring that the flash can work normally.

Optionally, in this embodiment of the present application, referring to FIG. 4, as shown in FIG. The second flash lamp 19; the positive pole of the first current source 16 and the positive pole of the second current source 17 are all connected with the first end (represented by a3 in FIG. The positive pole of a flash lamp 18 is connected, the negative pole of the second current source 17 is connected with the positive pole of the second flash lamp 19; the negative pole of the first flash lamp 18 and the negative pole of the second flash lamp 19 are both grounded.

It can be understood that the positive pole of the first flashlight 18 and the positive pole of the second flashlight 19 are both positive poles of the above-mentioned flashlight module 13, and the negative poles of the first flashlight and the negative pole of the second flashlight are both negative poles of the above-mentioned flashlight module.

In the embodiment of the present application, the first current source can be used for voltage division to output a stable current to the first flashlight, and the second current source can be used for voltage division to output a stable current to the second flashlight, thereby ensuring that the first The operating currents of the flashlight and the second flashlight remain stable.

In the embodiment of the present application, the first flash lamp and the second flash lamp may be light emitting diodes, or any other elements capable of emitting light.

It should be noted that the power consumption of the driving chip may include: power consumption of the first current source and power consumption of the second current source in the driving chip.

Optionally, in the embodiment of the present application, as shown in FIG. 5, when the flash circuit works in Buck mode, the voltage drop of the driver chip can be calculated by the following formula (3):

V _th =D ₁ *V _PH =V _HR +V _LED1 +V _LED2 ; (3)

Among them, V _th voltage threshold value, D ₁ is the first duty cycle, V _PH is the voltage of the input power supply; V _HR is the voltage drop of the driver chip, V _LED1 is the operating voltage of the first flashlight, V _LED2 is the second 2. The working voltage of the flashlight.

As shown in Figure 5, when the flash circuit works in Boost mode, the voltage drop of the driver chip can be calculated by the following formula (4):

Among them, V _th is the voltage threshold value, D ₂ is the second duty cycle, V _PH is the voltage of the input power supply; V _HR is the voltage drop of the driver chip, V _LED1 is the working voltage of the first flashlight, V _LED2 is the second 2. The working voltage of the flashlight.

Optionally, in the embodiment of the present application, the power consumption of each current source is: the voltage drop of the current source*the working current of the flashlight module.

Optionally, in this embodiment of the present application, referring to FIG. 5, as shown in FIG. 6, the above-mentioned flash circuit may include a driver chip 10, an input power supply 11, a first power module 12, a second power module 15, a flash module 13 and a control device (AP) 20; wherein, the driver chip 10 may include a microprocessor 14, a first current source 16, a second current source 17, a first switch tube Q1, a second switch tube Q2, a third switch tube Q3 and a fourth switch tube Q3. The switch tube Q4; the flashlight module 13 may include a first flashlight 18 and a second flashlight 19.

The microprocessor 14 is respectively connected to the controller 20, the control terminal c1 of the first switching tube Q1, the control terminal c2 of the second switching tube Q2, the control terminal c3 of the third switching tube Q3, and the control terminal c4 of the fourth switching tube Q4 ; The first terminal a1 of the first switching tube Q1 is connected to the positive pole of the input power supply 11, the second terminal b1 of the first switching tube Q1 is connected to the first terminal a2 of the second switching tube Q2 and the first terminal of the first power module 12 a connection, the first end a3 of the third switch tube Q3 is connected to the positive pole of the first current source 16, the second The positive pole of the current source 17 is connected to the positive pole of the second power module 15, the negative pole of the first current source 16 is connected to the positive pole of the first flash lamp 18, the negative pole of the second current source 17 is connected to the positive pole of the second flash lamp 19, and the third switch The second terminal b3 of the tube Q3 is connected to the first terminal a4 of the fourth switching tube Q4 and the second terminal b of the first power module 12, the negative pole of the input power supply 11, the second terminal b2 of the second switching tube Q2, the fourth The second terminal b4 of the switching tube Q4, the negative poles of the first flash lamp 18, the negative poles of the second flash lamp 19 and the negative pole of the second power module 15 are all grounded.

Optionally, in the embodiment of the present application, in a possible implementation manner, the controller may be configured to send a first control signal to the microprocessor when the voltage of the input power supply is greater than the voltage threshold value, so as to pass The microprocessor controls the third switch to be turned on and the fourth switch to be turned off; and when the third switch is turned on and the fourth switch is turned off: the first time period, sending a second control signal to the microprocessor, so that the microprocessor controls the first switch tube to be turned on and controls the second switch tube to be turned off; or, during the second time period in each step-down cycle, The third control signal is sent to the microprocessor, so that the microprocessor controls the first switch tube to be turned off and the second switch tube to be turned on. or,

The controller is configured to send a fourth control signal to the microprocessor during the third period of time in each boost cycle when the voltage of the input power supply is less than or equal to the voltage threshold value, so as to pass the microprocessor Control the third switching tube to turn off, and control the fourth switching tube to turn on; or, in the fourth time period of each boost cycle, send the fifth control signal to the microprocessor, so as to control the third switching tube through the microprocessor The switch tube is turned on, and the fourth switch tube is controlled to be turned off.

Optionally, in this embodiment of the present application, in another manner, the controller may send a control signal to the microprocessor to request the microprocessor to turn on the flashlight. Then, the microprocessor can judge the relationship between the voltage V _PH of the input power supply and the voltage threshold V _th .

If V _PH >V _th , it means that the flashlight circuit satisfies the working conditions of the Buck mode, so that the microprocessor can control the flashlight circuit to enter the Buck mode. Specifically: the microprocessor can dynamically adjust each step-down voltage according to the above formula (1). The duty ratio of mode 1 in the period (specifically, the above-mentioned first duty ratio D ₁ ).

Then, as shown in FIG. 7, the microprocessor 14 can control the third switch tube Q3 to be turned on, and the fourth switch tube Q4 to be turned off; One switch tube Q1 is turned on, and the second switch tube Q2 is turned off, so as to control the input power supply 11 to charge the first power supply module 12 (specifically, an inductor), and control the input power supply 11 to supply power to the flashlight module 13. The current path is shown in FIG. 7 indicated by the dotted arrow. Further, as shown in FIG. 8, the microprocessor can control the first switching tube Q1 to be turned off and control the second switching tube Q2 to be turned on in mode 2 in each step-down cycle, so as to control the discharge of the inductor, thereby Power is supplied to the flashlight module 13 through an inductor, and the current path at this time is shown by the dotted arrow in FIG. 8 . Since the microprocessor can control the flashlight current mode 1 and mode 2 alternately in the Buck mode, the output voltage V _out of the flashlight circuit is always kept at the minimum value, and the power consumption of the driver chip is also kept at the minimum value at this time.

It should be noted that, in each step-down cycle, the output voltage V _out of the flash circuit depends on the duty cycle of mode 1, that is, the proportion of the duration of mode 1 (ie, the first time period) in the step-down cycle .

If V _PH ≤ V _th , it means that the flashlight circuit satisfies the working conditions of the Boost mode, so that the microprocessor can control the flashlight circuit to enter the Boost mode. Specifically: the microprocessor can dynamically adjust each boost voltage according to the above formula (2). The duty ratio of mode 3 in the period (specifically, the above-mentioned second duty ratio D ₂ ).

Then, as shown in Figure 9, in each boost cycle, the microprocessor can control the first switch tube Q1 to be turned on, and control The second switch tube Q2 is turned off. And in mode 3 in each boost cycle, the microprocessor can control the fourth switching tube Q4 to turn on, and control the third switching tube Q3 to turn off, so as to charge the first power module 12 through the input power, at this time The second power supply module 15 discharges, so that the flashlight module 13 can be powered by the second power supply module. At this time, the current path of the input power supply is shown by the dotted arrow A in FIG. 9 , and the current path of the second power supply module 15 is shown in FIG. 9 The dashed arrow B. Further, as shown in FIG. 10 , in mode 4 in each boost cycle, the microprocessor can control the third switching tube Q3 to turn on, and control the fourth switching tube Q4 to turn off, so that the input power and the first The power supply module can supply power to the flashlight module 13 and charge the second power supply module 15 at the same time. At this time, it is discharging for the first power supply module and charging for the second power supply module. The current path is shown in the dashed arrow in Figure 10 shown. Since the microprocessor can control the flashlight current mode 1 and mode 2 alternately in Boost mode, the output voltage V _out of the flashlight circuit is always kept at the minimum value, and the power consumption of the driver chip is also kept at the minimum value.

It should be noted that in each boost cycle, the output voltage V _out of the flash circuit depends on the duty cycle of mode 2, that is, the proportion of the duration of mode 3 (ie, the third time period) in the boost cycle .

In this way, no matter how the voltage of the input power source changes, the output voltage of the flash circuit can always be kept at a minimum value, that is, the power consumption of the driver chip can also be kept at a minimum value, thereby reducing the risk of overheating of the driver chip, and furthermore Increase the normal working time of the flash module.

Optionally, in this embodiment of the present application, it is assumed that the range of the voltage V _PH of the input power supply is: 3.4V<VPH<4.5V, the voltage threshold value V _th is about 3.9V, and the minimum voltage drop of the driver chip is about 0.4V .

Optionally, in this embodiment of the application, after receiving the control signal sent by the controller, the microprocessor can also monitor the voltage of the input power in real time, and compare the monitored voltage with the voltage threshold to determine the input power The relationship between the voltage and the voltage threshold. Alternatively, after the controller sends a control signal to the microprocessor, it can also monitor the voltage of the input power supply in real time, and compare the monitored voltage with the voltage threshold value to determine the relationship between the voltage of the input power supply and the voltage threshold value.

An embodiment of the present application further provides an electronic device, which may include the flashlight circuit in the foregoing embodiment.

For other descriptions in the embodiments of the present application, specific reference may be made to relevant descriptions in the above-mentioned embodiments of the flash circuit, and in order to avoid repetition, details are not repeated here.

The embodiment of the present application also provides a flashlight control method, which is applied to the flashlight circuit in the above embodiment. FIG. 11 shows a flow chart of a flashlight control method provided in the embodiment of the present application. As shown in FIG. 11 , the flashlight control method provided in the embodiment of the present application may include the following steps 101 and 102 . The method will be exemplarily described below by taking an electronic device including the flash circuit as an example to execute the method.

Step 101: When the voltage of the input power supply in the flashlight circuit of the electronic device is greater than the voltage threshold value, the electronic device charges the first power supply module in the flashlight circuit through the input power supply during the first period of time within a step-down cycle, and Powers the flash module in the flash circuit.

Step 102: When the voltage of the input power supply in the flashlight circuit of the electronic device is greater than the voltage threshold value, the electronic device supplies power to the flashlight module through the first power supply module in a second time period within a voltage-down cycle.

Optionally, in the embodiment of the present application, the foregoing step 101 may specifically be implemented through the following step 101a.

Step 101a, the voltage of the input power supply of the electronic device in the flashlight circuit is greater than the voltage threshold value, and the flashlight circuit controls the third switch tube in the flashlight circuit to turn on and controls the fourth switch tube in the flashlight circuit to turn off Next, in the first time period, by controlling the first switch tube in the flash circuit to be turned on and controlling the second switch tube in the flash circuit to be turned off, the input power can charge the first power module and supply power to the flash module .

Optionally, in the embodiment of the present application, the foregoing step 102 may specifically be implemented through the following step 102a.

Step 102a, the voltage of the input power supply in the flashlight circuit of the electronic device is greater than the voltage threshold value, and when the flashlight circuit controls the third switch tube in the flashlight circuit to turn on and controls the fourth switch tube in the flashlight circuit to turn off , in the second time period, by controlling the first switch tube in the flash circuit to be turned off and controlling the second switch tube in the flash circuit to be turned on, so that the first power supply module supplies power to the flash module.

In the flashlight control method provided in the embodiment of the present application, when the voltage of the input power supply of the flashlight circuit is greater than the voltage threshold value, the electronic device can first charge the first power supply module through the input power supply in one step-down cycle, And supply power to the flashlight module through the input power supply, and then supply power to the flashlight module separately through the first power supply module, so when the voltage of the input power supply is relatively high, it can be ensured that the output voltage of the flashlight circuit is always kept at a minimum value, so that The power loss of the driver chip is minimal, which in turn ensures that the flash can work normally.

Optionally, in the embodiment of the present application, the flashlight control method provided in the embodiment of the present application may further include the following steps 103 to 105.

Step 103 , when the voltage of the input power is less than or equal to the voltage threshold value, the electronic device controls the first switching tube in the flash circuit to turn on and controls the second switching tube in the flash circuit to turn off.

Step 104: When the first switching tube is turned on and the second switching tube is turned off, the electronic device charges the first power module through the input power and drives the flashlight circuit in the third period of time within a boost cycle. The second power module of the flashlight module supplies power.

Step 105: When the first switching tube is turned on and the second switching tube is turned off, the electronic device supplies power to the flashlight module through the input power supply and the first power supply module in the fourth time period of a boost cycle, and provides The second power module is charged.

For other descriptions in the embodiments of the present application, specific reference may be made to relevant descriptions in the above-mentioned embodiments of the flash circuit, and in order to avoid repetition, details are not repeated here.

Optionally, in the embodiment of the present application, the electronic device may control the first switching tube in the flash circuit to conduct and control the second switching tube in the flash circuit to disconnected, then the above step 104 can be specifically realized by the following step 104a, and the above step 105 can be specifically realized by the following step 105a.

Step 104a. When the first switching tube is turned on and the second switching tube is turned off, the electronic device controls the third switching tube in the flash circuit to turn off and controls the fourth switching tube in the flash circuit in the third time period. The switch tube is turned on so that the input power can charge the first power supply module and the second power supply module can supply power to the flashlight module.

Step 105a, when the first switching tube is turned on and the second switching tube is turned off, the electronic device controls the third switching tube in the flash circuit to turn on and controls the fourth switching tube in the flash circuit in the fourth time period. The switch tube is turned off, so that the input power supply and the first power supply module supply power to the flashlight module, and the input power supply and the first power supply module charge the second power supply module.

In the embodiment of the present application, when the voltage of the input power supply of the flashlight circuit is less than or equal to the voltage threshold value, since the electronic device can control the first switch tube to be turned on and the second switch tube to be turned off, and the first switch tube When the tube is turned on and the second switch tube is turned off: in the third time period of each boost cycle, the first power supply module is charged through the input power supply, and the flashlight module is powered through the second power supply module; and In the fourth time period of each boost cycle, the flashlight module is powered by the input power supply and the first power supply module, and the output voltage of the flashlight circuit is increased by means of charging the second power supply module by the input power supply and the first power supply module, Therefore, it can be ensured that the output voltage of the flash lamp circuit is kept at a minimum value, thereby ensuring that the flash lamp can work normally.

For other descriptions in the embodiments of the present application, specific reference may be made to relevant descriptions in the above-mentioned embodiments of the flash circuit, and in order to avoid repetition, details are not repeated here.

Optionally, as shown in FIG. 12 , the embodiment of the present application also provides an electronic device 100, including a processor 101 and a memory 102. The memory 102 stores programs or instructions that can run on the processor 101. The When the programs or instructions are executed by the processor 101, the steps in the above-mentioned embodiment of the flashlight control method can be realized, and the same technical effect can be achieved. In order to avoid repetition, details are not repeated here.

It should be noted that the electronic devices in the embodiments of the present application include the above-mentioned mobile electronic devices and non-mobile electronic devices.

FIG. 13 is a schematic diagram of a hardware structure of an electronic device implementing an embodiment of the present application.

The electronic device 1000 includes, but is not limited to: a radio frequency unit 1001, a network module 1002, an audio output unit 1003, an input unit 1004, a sensor 1005, a display unit 1006, a user input unit 1007, an interface unit 1008, a memory 1009, and a processor 1010, etc. part.

Those skilled in the art can understand that the electronic device 1000 can also include a power supply (such as a battery) for supplying power to various components, and the power supply can be logically connected to the processor 1010 through the power management system, so that the management of charging, discharging, and function can be realized through the power management system. Consumption management and other functions. The structure of the electronic device shown in FIG. 13 does not constitute a limitation to the electronic device. The electronic device may include more or fewer components than shown in the figure, or combine some components, or arrange different components, and details will not be repeated here. .

Wherein, in the case that the electronic device 1000 shown in FIG. 13 includes the flashlight circuit in the above-mentioned embodiment, the processor 1010 may be used when the voltage of the input power supply in the flashlight circuit is greater than the voltage threshold value: In the first period of time in a step-down cycle, the first power supply module in the flash circuit is charged by the input power supply, and the flash module in the flash circuit is powered; in the second period of time in a step-down cycle, the first A power supply module supplies power to the flashlight module.

In a possible implementation manner, the processor 1010 may specifically be configured to: in the case of controlling the third switch tube in the flashlight circuit to be turned on and controlling the fourth switch tube in the flashlight circuit to be turned off: during the first time period , by controlling the first switch tube in the flashlight circuit to be turned on and the second switch tube in the flashlight circuit to be turned off, so that the input power can charge the first power supply module and supply power to the flashlight module.

In a possible implementation manner, the processor 1010 may specifically be configured to: in the case of controlling the third switch tube in the flashlight circuit to be turned on and controlling the fourth switch tube in the flashlight circuit to be turned off: during the second time period , by controlling the flash power The first switch tube in the circuit is turned off, and the second switch tube in the flashlight circuit is controlled to be turned on, so that the first power supply module supplies power to the flashlight module.

In a possible implementation manner, the processor 1010 may also be configured to control the conduction of the first switch tube in the flash circuit and control the first The second switching tube is turned off, and when the first switching tube is turned on and the second switching tube is turned off: in the third time period of a boost cycle, the first power supply module is charged by the input power and the flashlight is driven The second power supply module in the circuit supplies power to the flashlight module; in the fourth period of a boost cycle, the input power supply and the first power supply module supply power to the flashlight module and charge the second power supply module.

In a possible implementation manner, the processor 1010 may specifically be configured to control the third switch tube in the flash circuit to be turned off and control the fourth switch tube in the flash circuit to be turned on during the third time period, so that The input power charges the first power module and enables the second power module to supply power to the flashlight module.

In a possible implementation manner, the processor 1010 may specifically be configured to control the third switch tube in the flash circuit to be turned on and control the fourth switch tube in the flash circuit to be turned off during the fourth time period, so that The input power supply and the first power supply module supply power to the flashlight module, and make the input power supply and the first power supply module charge the second power supply module.

In the electronic device provided in the embodiment of the present application, when the voltage of the input power supply of the flashlight circuit is greater than the voltage threshold, the electronic device can first charge the first power supply module through the input power supply in one step-down cycle, and The flashlight module is powered by the input power supply, and then the flashlight module is powered solely by the first power supply module, so that the output voltage of the flashlight circuit can always be kept at a minimum value when the input power supply voltage is relatively high, so that the The power loss of the driver chip is minimal, which in turn ensures that the flash can work normally.

It should be understood that, in the embodiment of the present application, the input unit 1004 may include a graphics processor (Graphics Processing Unit, GPU) 10041 and a microphone 10042, and the graphics processor 10041 is used for the image capture device ( Such as the image data of the still picture or video obtained by the camera) for processing. The display unit 1006 may include a display panel 10061, and the display panel 10061 may be configured in the form of a liquid crystal display, an organic light emitting diode, or the like. The user input unit 1007 includes at least one of a touch panel 10071 and other input devices 10072 . The touch panel 10071 is also called a touch screen. The touch panel 10071 may include two parts, a touch detection device and a touch controller. Other input devices 10072 may include, but are not limited to, physical keyboards, function keys (such as volume control keys, switch keys, etc.), trackballs, mice, and joysticks, which will not be repeated here.

The memory 1009 can be used to store software programs as well as various data. The memory 1009 may mainly include a first storage area for storing programs or instructions and a second storage area for storing data, wherein the first storage area may store an operating system, an application program or instructions required by at least one function (such as a sound playing function, image playback function, etc.), etc. Furthermore, memory 1009 may include volatile memory or nonvolatile memory, or, memory 1009 may include both volatile and nonvolatile memory. Wherein, the non-volatile memory may be a read-only memory (Read-Only Memory, ROM), a programmable read-only memory (Programmable ROM, PROM), an erasable programmable read-only memory (Erasable PROM, EPROM), an electronically programmable Erase Programmable Read-Only Memory (Electrically EPROM, EEPROM) or Flash. The volatile memory can be Random Access Memory (Random Access Memory, RAM), Static Random Access Memory (Static RAM, SRAM), Dynamic Random Access Memory (Dynamic RAM, DRAM), Synchronous Dynamic Random Access Memory (Synchronous DRAM, SDRAM), Double Data Rate Synchronous Dynamic Random Access Memory (Double Data Rate SDRAM, DDRSDRAM), Enhanced Synchronous Dynamic Random Access Memory Access memory (Enhanced SDRAM, ESDRAM), synchronous connection dynamic random access memory (Synch link DRAM, SLDRAM) and direct memory bus random access memory (Direct Rambus RAM, DRRAM). The memory 1009 in the embodiment of the present application includes but is not limited to these and any other suitable types of memory.

The processor 1010 may include one or more processing units; optionally, the processor 1010 integrates an application processor and a modem processor, wherein the application processor mainly processes operations related to the operating system, user interface, and application programs, etc., Modem processors mainly process wireless communication signals, such as baseband processors. It can be understood that the foregoing modem processor may not be integrated into the processor 1010 .

The embodiment of the present application also provides a readable storage medium, the readable storage medium stores a program or an instruction, and when the program or instruction is executed by the processor, the various processes in the above-mentioned embodiment of the flashlight control method are implemented, and can achieve The same technical effects are not repeated here to avoid repetition.

Wherein, the processor is the processor in the electronic device described in the above embodiments. The readable storage medium includes a computer-readable storage medium, such as a computer read-only memory ROM, a random access memory RAM, a magnetic disk or an optical disk, and the like.

The embodiment of the present application further provides a chip, the chip includes a processor and a communication interface, the communication interface is coupled to the processor, and the processor is used to run programs or instructions to implement the above-mentioned flashlight control method embodiment Each process, and can achieve the same technical effect, in order to avoid repetition, will not repeat them here.

It should be understood that the chips mentioned in the embodiments of the present application may also be called system-on-chip, system-on-chip, system-on-a-chip, or system-on-a-chip.

The embodiment of the present application provides a computer program product, the program product is stored in a storage medium, and the program product is executed by at least one processor to implement the various processes in the above embodiments of the flashlight control method, and can achieve the same technical effect , to avoid repetition, it will not be repeated here.

It should be noted that, in this document, the term "comprising", "comprising" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article or apparatus comprising a set of elements includes not only those elements, It also includes other elements not expressly listed, or elements inherent in the process, method, article, or device. Without further limitations, an element defined by the phrase "comprising a ..." does not preclude the presence of additional identical elements in the process, method, article, or apparatus comprising that element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved. Functions are performed, for example, the described methods may be performed in an order different from that described, and various steps may also be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

Through the description of the above embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus a necessary general-purpose hardware platform, and of course also by hardware, but in many cases the former is better implementation. Based on such an understanding, the technical solution of this application is essentially or part of the contribution made to the prior art The component can be embodied in the form of computer software products, which are stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk), and include several instructions to make a terminal (which can be a mobile phone, a computer, a server) , or a network device, etc.) execute the methods described in the various embodiments of the present application.

The embodiments of the present application have been described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementations. The above-mentioned specific implementations are only illustrative and not restrictive. Those of ordinary skill in the art will Under the inspiration of this application, without departing from the purpose of this application and the scope of protection of the claims, many forms can also be made, all of which belong to the protection of this application.

Claims (17)

1. A flashlight circuit, the flashlight circuit comprising: a driver chip, an input power supply connected to the driver chip, a first power supply module, and a flashlight module;

   The driver chip is configured to: when the voltage of the input power source is greater than a voltage threshold value: drive the input power source to charge the first power module during a first period of time within a step-down cycle, and Driving the input power supply to supply power to the flashlight module; driving the first power supply module to supply power to the flashlight module during a second time period within the one step-down cycle.
2. The flashlight circuit according to claim 1, wherein the driving chip comprises a microprocessor, a first switching tube, a second switching tube, a third switching tube and a fourth switching tube;

   The microprocessor is respectively connected to the control terminal of the first switch tube, the control terminal of the second switch tube, the control terminal of the third switch tube and the control terminal of the fourth switch tube; The first end of the first switch tube is connected to the positive pole of the input power supply, and the second end of the first switch tube is connected to the first end of the second switch tube and the first end of the first power module. , the first end of the third switching tube is connected to the anode of the flashlight module, the second end of the third switching tube is connected to the first end of the fourth switching tube and the first end of the first power supply module The two terminals are connected, and the second end of the second switching tube, the second end of the fourth switching tube, the negative pole of the flashlight module and the negative pole of the input power supply are all grounded;

   Wherein, the microprocessor is configured to control the third switching tube to turn on and control the fourth switching tube to turn off when the voltage of the input power supply is greater than a voltage threshold value; and When the third switch tube is turned on and the fourth switch tube is turned off:

   During the first period of time, by controlling the first switch to be turned on and the second switch to be turned off, the input power is driven to charge the first power module, and the input power is driven powering said flash module; or,

   In the second time period, by controlling the first switch tube to be turned off and the second switch tube to be turned on, the first power supply module is driven to supply power to the flashlight module.
3. The flash circuit according to claim 1, wherein the flash circuit further comprises a second power module connected to the driving chip;

   The driver chip is further configured to: when the voltage of the input power is less than or equal to the voltage threshold value: in a third period of time within a boost cycle, drive the input power as the first power module charging, and driving the second power supply module to supply power to the flashlight module; driving the input power supply and the first power supply module to supply power to the flashlight module during a fourth period of time in the one boost cycle, And drive the input power supply and the first power supply module to charge the second power supply module.
4. The flashlight circuit according to claim 3, wherein the driving chip comprises a microprocessor, a first switching tube, a second switching tube, a third switching tube and a fourth switching tube;

   The microprocessor is respectively connected to the control terminal of the first switch tube, the control terminal of the second switch tube, the control terminal of the third switch tube and the control terminal of the fourth switch tube; The first end of the first switch tube is connected to the positive pole of the input power supply, and the second end of the first switch tube is connected to the first end of the second switch tube and the first end of the first power module. , the first end of the third switching tube is connected to the anode of the flashlight module and the anode of the second power supply module, The second end of the third switch tube is connected to the first end of the fourth switch tube and the second end of the first power module, the second end of the second switch tube, the fourth switch tube The second end of the tube, the negative pole of the flashlight module, the negative pole of the input power supply and the negative pole of the second power supply module are all grounded;

   Wherein, the microprocessor is configured to control the first switching tube to be turned on and the second switching tube to be turned off when the voltage of the input power supply is less than or equal to a voltage threshold value, and When the first switch tube is turned on and the second switch tube is turned off:

   In the third time period, by controlling the third switch tube to be turned off and the fourth switch tube to be turned on, the input power supply is driven to charge the first power module, and the second A power module supplies power to the flash module; or,

   In the fourth time period, by controlling the third switching tube to be turned on and the fourth switching tube to be turned off, the input power supply and the first power supply module are driven to supply power to the flashlight module, and Driving the input power supply and the first power supply module to charge the second power supply module.
5. The flash circuit according to claim 2 or 4, wherein the driver chip further includes a first current source and a second current source; the flash module includes a first flash and a second flash;

   Both the positive pole of the first current source and the positive pole of the second current source are connected to the first end of the third switching tube, and the negative pole of the first current source is connected to the positive pole of the first flashlight, so The negative pole of the second current source is connected to the positive pole of the second flashlight; the positive pole of the first flashlight and the positive pole of the second flashlight are both positive poles of the flashlight module, and the negative pole of the first flashlight is connected to the positive pole of the second flashlight The negative poles of the second flash lamps are all grounded.
6. An electronic device, comprising: the flash circuit according to any one of claims 1 to 5.
7. A flashlight control method, applied to the flashlight circuit according to any one of claims 1 to 5, the method comprising:

   In the case where the voltage of the input power supply in the flash circuit is greater than a voltage threshold:

   During a first period of time in a step-down cycle, charging a first power module in the flash circuit through the input power supply, and supplying power to a flash module in the flash circuit;

   During the second period of time in the one step-down cycle, the first power supply module supplies power to the flashlight module.
8. The method according to claim 7, wherein, during the first period of time in a step-down cycle, the input power is used to charge the first power module in the flash circuit and to charge the power module in the flash circuit. The flash module power supply, including:

   In the case of controlling the third switch tube in the flash lamp circuit to be turned on and controlling the fourth switch tube in the flash lamp circuit to be turned off:

   In the first time period, by controlling the first switch tube in the flash circuit to be turned on and controlling the second switch tube in the flash circuit to be turned off, the input power is the first power supply The module charges and supplies power to the flash module.
9. The method according to claim 7, wherein, in the second period of time in the step-down cycle, supplying power to the flashlight module through the first power supply module includes:

   In the case of controlling the third switch tube in the flash lamp circuit to be turned on and controlling the fourth switch tube in the flash lamp circuit to be turned off:

   In the second period of time, by controlling the first switch tube in the flash circuit to be turned off and controlling the second switch tube in the flash circuit to be turned on, the first power supply module can be used for the flash Module power supply.
10. The method according to claim 7, wherein the method further comprises:

    When the voltage of the input power supply is less than or equal to the voltage threshold value, control the first switching tube in the flash circuit to turn on and control the second switching tube in the flash circuit to turn off, and When the first switch tube is turned on and the second switch tube is turned off:

    In a third period of time within a boost cycle, charging the first power module through the input power supply, and driving a second power module in the flash circuit to supply power to the flash module;

    In the fourth period of time in the one boost cycle, the input power supply and the first power module supply power to the flashlight module and charge the second power module.
11. The method according to claim 10, wherein, in the third period of time within a boost cycle, the input power supply is used to charge the first power supply module and drive the second power supply in the flash circuit The module powers the flash module, including:

    In the third time period, by controlling the third switch tube in the flash circuit to be turned off and controlling the fourth switch tube in the flash circuit to be turned on, the input power is the first power supply charging the module, and enabling the second power supply module to supply power to the flashlight module.
12. The method according to claim 10, wherein, in the fourth period of time in the boost cycle, the input power supply and the first power supply module are used to supply power to the flashlight module, and to supply power to the Charging the second power module, including:

    In the fourth time period, by controlling the third switch tube in the flash circuit to be turned on and controlling the fourth switch tube in the flash circuit to be turned off, the input power and the first power supply The module supplies power to the flashlight module, and enables the input power supply and the first power module to charge the second power module.
13. An electronic device, comprising a processor and a memory, the memory stores programs or instructions that can run on the processor, and when the programs or instructions are executed by the processor, any one of claims 7-12 is implemented The steps of the flash control method described in the item.
14. A readable storage medium, on which a program or instruction is stored, and when the program or instruction is executed by a processor, the steps of the flashlight control method according to any one of claims 7-12 are realized.
15. A computer program product, the computer program product is executed by at least one processor to implement the flashlight control method according to any one of claims 7-12.
16. An electronic device, comprising that the electronic device is configured to execute the flashlight control method according to any one of claims 7-12.
17. A chip, the chip includes a processor and a communication interface, the communication interface is coupled to the processor, the processor is used to run programs or instructions, and realize the flashlight according to any one of claims 7-12 Control Method.