CN109873466B

CN109873466B - Miniature lamp control circuit and miniature explosion-proof flashlight

Info

Publication number: CN109873466B
Application number: CN201711265510.1A
Authority: CN
Inventors: 周明杰; 肖磊
Original assignee: Oceans King Lighting Science and Technology Co Ltd; Oceans King Dongguan Lighting Technology Co Ltd; Shenzhen Oceans King Lighting Engineering Co Ltd
Current assignee: Oceans King Lighting Science and Technology Co Ltd; Oceans King Dongguan Lighting Technology Co Ltd; Shenzhen Oceans King Lighting Engineering Co Ltd
Priority date: 2017-12-05
Filing date: 2017-12-05
Publication date: 2020-10-27
Anticipated expiration: 2037-12-05
Also published as: CN109873466A

Abstract

The invention is suitable for the electronic field, has provided a miniature lamps and lanterns control circuit and miniature explosion-proof electric torch, the circuit includes: the charging unit is used for controlling the charging of the battery, and is directly connected with the USB interface or connected with the USB interface through a data line; the electric quantity display unit is used for displaying the current electric quantity; the switch unit is used for controlling the electric quantity display unit to generate a driving signal through a switch; and the LED driving unit is used for driving the LED to emit light according to the driving signal. The multifunctional LED charger integrates functional modules such as LED driving, electric quantity display and USB charging, has the functions of multiple purposes, convenience in charging, capability of displaying the electric quantity of a battery in real time and the like, and is convenient for customers to charge and display the electric quantity in real time.

Description

Miniature lamp control circuit and miniature explosion-proof flashlight

Technical Field

The invention belongs to the field of electronics, and particularly relates to a miniature lamp control circuit and a miniature explosion-proof flashlight.

Background

At present, most of small and miniature flashlights are not provided with a charging circuit and an electric quantity display circuit in a main body, so that the miniature flashlights have to use a special charger and cannot be butted with a mobile phone charger, a charger and the like to realize a charging function, and the charging is very inconvenient; in addition, because the electric quantity display circuit is not arranged, the electric quantity of the lamp cannot be displayed in real time, and a customer cannot determine whether to charge or not according to the real-time electric quantity of the lamp and whether to replace a battery.

Disclosure of Invention

The embodiment of the invention aims to provide a miniature lamp control circuit, and aims to solve the problems that the conventional miniature flashlight is inconvenient to charge due to the fact that special charging equipment is required to be used, and the electric quantity of a lamp cannot be displayed in real time.

The embodiment of the invention is realized in such a way that a miniature lamp control circuit is connected with a battery, and the circuit comprises:

the charging unit is used for controlling the charging of the battery, the charging unit is directly connected with the USB interface or is connected with the USB interface through a data line, and the charging output end of the charging unit is connected with the charging end of the battery;

the charging device comprises an electric quantity display unit, a charging unit and a charging unit, wherein the electric quantity display unit is used for displaying the current electric quantity, an electric quantity display control end of the electric quantity display unit is connected with a display output end of the charging unit, and a power supply end of the electric quantity display unit is connected with a charging end of the battery;

the switch unit is used for controlling the electric quantity display unit to generate a driving signal through a switch, and the output end of the switch unit is connected with the switch control end of the electric quantity display unit;

and the LED driving unit is used for driving the LED to emit light according to the driving signal, the control end of the LED driving unit is connected with the driving end of the electric quantity display unit, and the power end of the LED driving unit is connected with the charging end of the battery.

Another objective of the embodiment of the present invention is to provide a miniature explosion-proof flashlight, which includes a lamp body cylinder, the miniature lamp control circuit is disposed inside the lamp body cylinder, a lamp holder cylinder is disposed at one end of the lamp body cylinder, a tail cover is disposed at the other end of the lamp body cylinder, a transparent part for transmitting light is disposed on a cross section of an end portion of the lamp holder cylinder, the transparent part is fixedly connected to the lamp holder cylinder through a lamp holder press ring, the USB interface is also leaked from a surface of the lamp body cylinder, a USB plug is covered on the USB interface, the USB plug is connected to the surface of the lamp body cylinder, an electric quantity display window for displaying electric quantity of a battery is further disposed on the surface of the lamp body cylinder, and a switch component for switching on and off display of light and electric quantity of a lamp is disposed on the tail cover.

The embodiment of the invention integrates functional modules such as LED drive, electric quantity display, USB charging and the like, has the functions of multiple purposes, convenient charging, real-time display of the electric quantity of the battery and the like, and is convenient for customers to charge and display the electric quantity in real time; meanwhile, the battery is powered off instantly, so that the lamp and the electric quantity display are kept not to be extinguished, the lamp is prevented from being extinguished under abnormal conditions such as knocking and falling, and the functions and the stability of the product are improved.

Drawings

Fig. 1 is a structural diagram of a miniature lamp control circuit according to an embodiment of the present invention;

fig. 2 is a circuit diagram illustrating an exemplary charging unit in a control circuit of a miniature lamp according to an embodiment of the present invention;

fig. 3 is a circuit diagram illustrating an exemplary power display unit in the control circuit of the miniature lamp according to the embodiment of the present invention;

fig. 4 is a circuit diagram illustrating an example of an LED driving unit in a miniature lamp control circuit according to an embodiment of the present invention;

fig. 5 is a structural diagram of a miniature explosion-proof flashlight provided by the embodiment of the invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

The embodiment of the invention integrates functional modules such as LED driving, electric quantity display, USB charging and the like, has the functions of multiple purposes, convenient charging, real-time battery electric quantity display and the like, and is convenient for customers to charge and display the electric quantity in real time.

Fig. 1 shows a structure of a miniature lamp control circuit provided in an embodiment of the present invention, and for convenience of description, only the parts related to the present invention are shown.

As an embodiment of the present invention, the miniature lamp control circuit can be applied to various miniature flashlights, especially miniature explosion-proof flashlights, and is connected to a battery, including:

the charging unit 11 is used for controlling the charging of the battery, the charging unit 11 is directly connected with the USB interface or is connected with the USB interface through a data line, and the charging output end of the charging unit 11 is connected with the charging end of the battery;

in the embodiment of the invention, the miniature lamp control circuit comprises the charging unit 11, and the charging unit 11 is directly connected with a USB interface or is connected with a USB interface through a data line, so that the charging function is realized by butting with a mobile phone charger, a charger and the like, a special charging device is not needed for charging, and the compatibility and the convenience of charging are enhanced.

The electric quantity display unit 12 is used for displaying the current electric quantity, the electric quantity display control end of the electric quantity display unit 12 is connected with the display output end of the charging unit 11, and the power supply end of the electric quantity display unit 12 is connected with the charging end of the battery;

in the embodiment of the invention, the current electric quantity of the battery can be displayed in real time by arranging the electric quantity display unit 12, so that a user can clearly judge whether the lamp needs to be charged or the battery needs to be replaced according to the real-time electric quantity of the lamp, and the usability and the functionality of a product are greatly enhanced.

The switch unit 13 is used for controlling the electric quantity display unit 12 to generate a driving signal through a switch, and the output end of the switch unit 13 is connected with the switch control end of the electric quantity display unit 12;

specifically, the switch unit 13 may be a key switch, a touch switch, a toggle switch, or an inductive switch;

one conducting end of the key switch, the touch switch, the toggle switch or the inductive switch is an output end of the switch unit 13, and the other conducting end of the key switch, the touch switch, the toggle switch, the rotary switch or the inductive switch is grounded.

And the LED driving unit 14 is used for driving the LED to emit light according to the driving signal, a control end of the LED driving unit 14 is connected with the driving end of the electric quantity display unit 12, and a power end of the LED driving unit 14 is connected with a charging end of the battery.

Fig. 2 shows an exemplary circuit structure of a charging unit in a miniature lamp control circuit provided in an embodiment of the present invention, and for convenience of description, only the part related to the present invention is shown.

As an embodiment of the present invention, the charging unit 11 includes:

the circuit comprises a resistor R10, a capacitor C4, a capacitor C5, a diode D2, a diode D3 and a power chip U4;

the anode of the diode D2 is, the cathode of the diode D3 is correspondingly connected with the USB interface, the cathode of the diode D2 is connected with the system power voltage, the cathode of the diode D2 is also grounded through the capacitor C4, the anode of the diode D3 is grounded, the chip start energy input end (pin 8) of the power chip U4 is connected with the system power voltage, the battery temperature detection end (pin 1) of the power chip U4 is grounded, the constant current charging current setting and charging current monitoring end (pin 2) of the power chip U4 is connected with the power ground end (pin 3) through the resistor R10, the battery connection end (pin 5) of the power chip U4 is the charging output end of the charging unit 11 and is grounded through the capacitor C5, the battery charging completion indication end (pin 6) of the power chip U4 and the charging state indication end (pin 7) of the open-drain output are two display output ends of the charging unit 11, and the input voltage positive input end (pin 4) of the power chip U4 is connected with the system power voltage.

Preferably, the power supply chip U4 is a PT4057 type constant current charging chip.

Where pin 1 is a battery temperature detection pin (TEMP), if the voltage at the TEMP pin is less than 45% of the input voltage or greater than 80% of the input voltage, meaning that the battery temperature is too low or too high, then charging is suspended. If the TEMP is directly connected with the GND, the battery temperature detection function is cancelled, and other charging functions are normal;

the 2 pins are a constant current charging current setting and charging current monitoring Pin (PROG), and the charging current can be programmed by connecting an external resistor to the ground from the PROG pin. In the pre-charging stage, the voltage of the pin is modulated at 0.1V; in the constant current charging stage, the voltage of the pin is fixed at 1V;

pin 3 is a power ground pin;

pin 4 is an input voltage positive input pin (Vcc), and the voltage of the Vcc pin is a working power supply of an internal circuit; when the voltage difference between the Vcc pin and the BAT pin is less than 30mV, LY5056 enters a low-power-consumption shutdown mode, and the current of the BAT pin is less than 2uA at the moment;

the 5 pin is a battery connection pin (BAT), the positive end of the battery is connected to the BAT pin, and when the chip is forbidden to work or in a sleep mode, the leakage current of the BAT pin is less than 2 uA; the BAT pin provides a charging current and a 4.2V limit voltage pin for the battery;

pin 6 is a battery charging completion indication pin (STDBY), which is pulled to a low level by an internal switch when the battery charging is completed, and indicates that the charging is completed; in addition, the STDBY pin will be in a high impedance state;

a charge state indicator pin (CHRG) with 7 pins as an open-drain output, wherein when the charger charges the battery, the CHRG pin is pulled to a low level by an internal switch to indicate that the charging is in progress; otherwise, the CHRG pin is in a high resistance state;

the 8 pin is a chip initial energy input pin (CE), and the CE pin inputs high level, so that the PT4057 constant current charging chip is in a normal working state; when the CE pin inputs low level, LY5056 is in a forbidden charging state; the CE pin may be driven by TTL level or CMOS level.

In the embodiment of the invention, the charging unit 11 is preferably built by adopting a PT4057 type constant current charging chip, the PT4057 type constant current charging chip is a complete power supply chip which is charged by adopting constant current and has a single lithium ion battery with reverse connection protection of a positive electrode and a negative electrode of the battery, and because the PT4057 type constant current charging chip adopts an internal PMOSFET framework and is provided with an anti-overcharging circuit, an external detection resistor and an isolation diode are not needed. The thermal feedback can regulate the charging current to limit the chip temperature under high power operation or high ambient temperature conditions. The charging voltage is fixed at 4.2V and the charging current is set externally via a resistor R10. When the charging current drops to the set value 1/10 after reaching the final float voltage, the PT4057 type constant current charging chip will automatically terminate the charging cycle. When the input voltage is removed, the PT4057 type constant current charging chip automatically enters a low current state, and the leakage current of the battery is reduced to be below 2 uA.

The PT4057 type constant current charging chip can also be put in a shutdown mode to reduce the supply current to 40 uA. Other features of the PT4057 constant current charging chip include a charging current monitor, under-voltage lockout, automatic recharge and two status pins for indicating the end of charge and input voltage access.

The 7-pin and the 6-pin output two signals G, R to the power display unit, and the display module can display the power of the battery in real time during charging, and preferably, the display modes of the light emitting diodes LED1-LED4 are in a mode of a "horse race lamp", so that the display can be clearer.

Fig. 3 shows an exemplary circuit structure of the power display unit in the miniature lamp control circuit according to the embodiment of the present invention, and for convenience of description, only the relevant parts of the miniature lamp control circuit are shown.

As an embodiment of the present invention, the electric quantity display unit 12 includes:

the driving circuit comprises a resistor R1, a resistor R2, a resistor R8, a resistor R15, a capacitor C1, a capacitor C2, a capacitor C7, a capacitor C8, a capacitor C9, a voltage regulator tube, a display module 121 and a driving main chip U1;

one end of a resistor R1 is a power supply end of the electric quantity display unit 12, the other end of the resistor R1 is simultaneously connected with one end of a resistor R2 and one end of a capacitor C2, the other end (V-) of the resistor R2 is grounded, the other end of a capacitor C2 is grounded, one end (VAD1) of the capacitor C2 is also connected with a voltage detection end (pin 13) of a driving main chip U1, one end of a capacitor C7 is simultaneously connected with a power supply end of the electric quantity display unit 12 and a power supply input end (pin 1) of a driving main chip U1, the other end of a capacitor C7 is grounded, a power supply input end (pin 1) of the driving main chip U1 is also connected with one end of a resistor R15, the other end (S1) of a resistor R15 is simultaneously connected with an electric quantity display control end (pin 4) of the driving main chip U1 and one end of a capacitor C8, the other end of the capacitor C8 is grounded, a capacitor C9 is connected in parallel with a capacitor C8, the electric quantity display control end, two charging detection terminals (2 pins and 3 pins) of a driving main chip U1 are respectively two electric quantity display control terminals of an electric quantity display unit 12 and are correspondingly connected with 7 pins and 6 pins of a PT4057 type constant current charging chip, a driving power supply control terminal (5 pins) and a duty ratio output terminal (6 pins) of the driving main chip U1 are respectively two driving terminals of the electric quantity display unit 12, a power supply input terminal (1 pin) and a grounding terminal (14 pin) of the driving main chip U1 are connected through a capacitor C1, the grounding terminal (14 pin) of the driving main chip U1 is grounded, a plurality of driving electric quantity display terminals (7 pins, 10 pins, 11 pins and 12 pins) of the driving main chip U1 are respectively and correspondingly connected with a plurality of driving terminals (LED4, LED3, LED2 and LED1) of a display module 121, a low-voltage protection terminal (9 pin) of the driving main chip U1 is simultaneously connected with an anode of a voltage regulator tube and one end of a resistor R8, the other end of the resistor R8 is connected with the output terminal (1) of the driving main chip, the anode of the voltage regulator tube is grounded, and the common end of the voltage regulator tube is connected with one end of a resistor R8.

Preferably, the driving main chip U1 is an SN2702 type switch control single chip microcomputer.

As a preferred embodiment of the present invention, the display module 121 includes:

the resistor R3, the resistor R6, the resistor R7 and the resistor R9, and the light emitting diodes LED1, LED2, LED3 and LED 4;

one end of each of the resistors R3, R6, R7, and R9 is the four driving ends of the display module 121, one end of each of the resistors R3, R6, R7, and R9 is connected to the anodes of the

LEDs

1, 2, 3, and 4, and the cathodes of the

LEDs

2, 3, and 4 are grounded.

In the embodiment of the present invention, the electric quantity display unit 12 preferably uses an SN2702 type switch control single chip to control and display the real-time electric quantity of the battery. The voltage of a battery charging end BT + supplies power to an SN2702 type switch control single chip microcomputer through a pin 1, and the functions are as follows:

1) the voltage of the battery BT + is detected, the signal levels of the LED1, the LED2, the LED3 and the LED4 are output according to the voltage through program setting, and when the battery power is 75% -100%, the LED1, the LED2, the LED3 and the LED4 are all high levels, and four LEDs 1-LED4 are driven to emit light; when the electric quantity is 50% -75%, the LED1, the LED2 and the LED3 are at high level, the LED4 is at low level, and three LEDs 1-3 are driven to emit light; when the electric quantity is 25% -50%, the LED1 and the LED2 are at high level, the LED3 and the LED4 are at low level, and the two LEDs 1-2 are driven to emit light; when the electric quantity is lower than 25%, only the LED1 outputs high level, and 1 LED1 is driven to flash to display to remind a customer of charging.

2) And detecting the charging signals of the

pins

2 and 3, and displaying the charging state.

3) And an electric quantity display control end (4 pins) of the driving main chip U1 is connected with the switch unit 13 to control the output of electric quantity display, the switch unit 13 is used as a switch for driving the lamp and is also used as a switch for displaying the electric quantity, when the switch unit 13 is closed, the driving signals PWM1 and PWM2 are output to control the LED driving unit 14 to drive the lamp to light, meanwhile, the electric quantity display unit 12 works normally to display, when the switch unit 13 is disconnected, the driving signals PWM1 and PWM2 do not output, the LED driving unit 14 does not work, and the electric quantity display unit 12 also does not display.

4) And input undervoltage protection to prevent over discharge of the battery. Undervoltage protection is input at an undervoltage protection end (pin 9) of a driving main chip U1, and when a pin 1 of an SN2702 type switch control single chip microcomputer detects that the voltage of a battery is more than 3V, the single chip microcomputer works normally; when the pin 1 of the SN2702 type switch control single chip microcomputer detects that the battery voltage is lower than 3V, the SN2702 type switch control single chip microcomputer enters an undervoltage protection state, the driving main chip U1 is not conducted, and no output exists in driving signals PWM1 and PWM2, so that the battery damage caused by the over-discharge of the battery is prevented.

5) And the lamp is not extinguished in case of instantaneous power failure.

When the lamp is knocked or dropped, the battery and the thimble are separated instantaneously, so that the voltage of the output BT + of the battery is 0 between 100ms and 200ms, if no special processing is performed, the voltage of the BT + detected by the single chip microcomputer is lower than 3V, the single chip microcomputer does not output, and the LED1-LED4 for displaying the electric quantity and the LED of the lamp are both extinguished or flickered, so that the continuous voltage detection for 1 second is added in the program of the SN2702 type switch control single chip microcomputer to obtain an average value as an input voltage, thereby determining whether the voltage of the battery is instantaneous low voltage or continuous low voltage, and only when the average value of the detected voltage for 1 second is lower than 3V, the SN2702 type switch control single chip microcomputer closes an output control signal and closes the LED1-LED4 for displaying the electric quantity and the LED of the lamp.

6) And a drive power supply control end (5 pins) of the drive main chip U1 supplies power to the drive chip U2, when the switch is closed, the power is supplied to the drive chip U2, the drive chip U2 normally works, otherwise, the drive chip U2 does not work.

7) And a duty ratio output end (pin 6) of the driving main chip U1 controls a second switch tube Q2 in the LED driving unit 14 according to the switching state and the internally arranged duty ratio.

The embodiment of the invention ensures that the functions of the miniature lamp control circuit are more diversified, can avoid the extinguishment or flicker of the lamp under the abnormal conditions of impact, falling and the like, and improves the function and the stability of the product.

Fig. 4 shows an exemplary circuit structure of an LED driving unit in a miniature lamp control circuit provided by an embodiment of the present invention, and only the relevant parts to the present invention are shown for convenience of description.

As an embodiment of the present invention, the LED driving unit 14 includes:

the LED driving circuit comprises a resistor R4, a resistor R5, a resistor R11, a resistor R14, a resistor R15, a resistor R16, a capacitor C3, a first switch tube Q1, a second switch tube Q2, a light-emitting diode LED and a driving chip U2;

the non-control end (pin 1) and the grounding end (pin 2) of the driving chip U2 are both grounded, the power input end (pin 3) of the driving chip U2 is the first control end of the LED driving unit 14 and is grounded through a resistor R11, the output current detection end (pin 4) of the driving chip U2 is simultaneously connected with one end of a resistor R5 and one end of a resistor R4, the other ends of a resistor R5 and a resistor R4 are simultaneously grounded, the output current detection end (pin 4) of the driving chip U2 is also connected with the current input end of a second switch tube Q2, the current output end of the second switch tube Q2 is grounded through a resistor R15, the control end of the second switch tube Q2 is the second control end of the LED driving unit 14 and is grounded through a resistor R14, the external driving end (pin 5) of the driving chip U2 is connected with the control end of a first switch tube Q1, the current output end of the first switch tube Q1 is connected with the output current detection end (pin 4) of the driving chip U2, the current input end of the first switch tube Q1 is connected to one end of the resistor R16, the other end of the resistor R16 is connected to the cathode of the light emitting diode LED, and the anode of the light emitting diode LED is the power supply end of the LED driving unit 14 and is grounded through the capacitor C3.

Preferably, the driving chip U2 is MH7136 type driving chip.

Wherein, pin 1 is an NC pin; pin 2 is a GND pin 2; pin 3 is a VDD pin; 4 pins are CS pins; pin 5 is EXT pin 5, which drives the external NMOS.

Preferably, the first switching tube Q1 and the second switching tube Q2 are both N-type MOS tubes;

the drain of the N-type MOS transistor is a current input terminal of the first switch transistor Q1 or the second switch transistor Q2, the source of the N-type MOS transistor is a current output terminal of the first switch transistor Q1 or the second switch transistor Q2, and the gate of the N-type MOS transistor is a control terminal of the first switch transistor Q1 or the second switch transistor Q2.

In the embodiment of the invention, the switch unit 13 controls the driving main chip U1 in the electric quantity display unit 12 to output driving signals PW1 and PW2, and the driving signals PW1 and PW2 respectively control the connection and disconnection of the pin 3 of the driving chip U2 and the second switch tube Q2, so as to control the output current of the light source LED.

Fig. 5 shows the structure of the miniature explosion-proof flashlight provided by the embodiment of the invention, and for convenience of explanation, only the parts relevant to the invention are shown.

As an embodiment of the invention, the miniature explosion-proof flashlight comprises a lamp body cylinder 6, one end of the lamp body cylinder 6 is provided with a lamp holder cylinder 3, the other end of the lamp body cylinder 6 is provided with a tail cover 7, the section of the end part of the lamp holder cylinder 3 is provided with a transparent part 1, the transparent part 1 is fixedly connected with the lamp holder cylinder 3 through a lamp holder press ring 2, the surface of the lamp body cylinder 6 can be further provided with a USB plug 4 and an electric quantity display window 5, and the end part of the tail cover 7 is provided with a switch component 9.

The inside of the lamp body tube 6 is further provided with the miniature lamp control circuit in each of the above embodiments, wherein the light emitting diode LED in the LED driving unit 14 is arranged in the lamp head tube 3 and can project light through the transparent member 1, the USB interface connected with the charging unit 11 leaks out of the surface of the lamp body tube 6 and is plugged and covered on the USB interface through the USB plug 4 so as to realize interface dust prevention, the plurality of LEDs 1-LEDs 4 in the electric quantity display unit 12 can display the electric quantity of the battery through the electric quantity display window 5, and the control end of the switch unit 13 controls the on or off of the switch unit 13 through the switch component 9, thereby realizing the on-off control of the lamp light and the electric quantity display.

The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A miniature lamp control circuit connected to a battery, said circuit comprising:

the LED driving unit is used for driving an LED to emit light according to the driving signal, a control end of the LED driving unit is connected with a driving end of the electric quantity display unit, and a power supply end of the LED driving unit is connected with a charging end of the battery;

the electric quantity display unit includes:

the driving circuit comprises a resistor R1, a resistor R2, a resistor R8, a resistor R15, a capacitor C1, a capacitor C2, a capacitor C7, a capacitor C8, a capacitor C9, a voltage regulator tube, a display module and a driving main chip;

one end of the resistor R1 is a power end of the electric quantity display unit, the other end of the resistor R1 is connected to one end of the resistor R2 and one end of the capacitor C2, the other end of the resistor R2 is grounded, the other end of the capacitor C2 is grounded, one end of the capacitor C2 is further connected to a voltage detection end of the driving main chip, one end of the capacitor C7 is connected to a power end of the electric quantity display unit and a power input end of the driving main chip, the other end of the capacitor C7 is grounded, the power input end of the driving main chip is further connected to one end of the resistor R15, the other end of the resistor R15 is connected to an electric quantity display control end of the driving main chip and one end of the capacitor C8, the other end of the capacitor C8 is grounded, the capacitor C9 is connected in parallel to the capacitor C8, and the electric quantity display control end of the driving main chip is a switch control end of the electric quantity display unit, the two charging detection ends of the driving main chip are respectively two electric quantity display control ends of the electric quantity display unit, the driving power supply control end and the duty ratio output end of the driving main chip are respectively two driving ends of the electric quantity display unit, the power input end and the grounding end of the driving main chip are connected through a capacitor C1, the grounding end of the driving main chip is grounded, a plurality of driving electric quantity display ends of the driving main chip are respectively and correspondingly connected with a plurality of driving ends of the display module, the undervoltage protection end of the driving main chip is simultaneously connected with the anode of the voltage stabilizing tube and one end of a resistor R8, the other end of the resistor R8 is connected with the voltage output end of the driving main chip, the anode of the voltage stabilizing tube is grounded, and the common end of the voltage stabilizing tube is connected with one end of the resistor R8.

2. The circuit of claim 1, wherein the charging unit comprises:

the circuit comprises a resistor R10, a capacitor C4, a capacitor C5, a diode D2, a diode D3 and a power chip;

the anode of the diode D2 and the cathode of the diode D3 are correspondingly connected with the USB interface respectively, the cathode of the diode D2 is connected to the system supply voltage, the cathode of the diode D2 is also connected to ground through the capacitor C4, the anode of the diode D3 is grounded, the chip energy input end of the power supply chip is connected with the system power supply voltage, the battery temperature detecting end of the power supply chip is grounded, the constant current charging current setting and charging current monitoring end of the power supply chip is connected with the power supply ground end through the resistor R10, the battery connecting end of the power supply chip is the charging output end of the charging unit and is grounded through the capacitor C5, the battery charging completion indicating terminal of the power supply chip and the charging state indicating terminal of the drain open circuit output are two display output terminals of the charging unit respectively, and the input voltage positive input terminal of the power supply chip is connected with the power supply voltage.

3. The circuit of claim 2, wherein the power chip is a PT4057 type constant current charging chip.

4. The circuit of claim 3, wherein the driving master chip is an SN2702 type switch control single chip.

5. The circuit of claim 3, wherein the display module comprises:

one end of each of the resistor R3, the resistor R6, the resistor R7, and the resistor R9 is respectively four driving ends of the display module, one end of each of the resistor R3, the resistor R6, the resistor R7, and the resistor R9 is respectively connected to anodes of the light emitting diode LED1, the light emitting diode LED2, the light emitting diode LED3, and the light emitting diode LED4, and cathodes of the light emitting diode LED2, the light emitting diode LED3, and the light emitting diode LED4 are simultaneously grounded.

6. The circuit of claim 1, wherein the LED driving unit comprises:

the LED driving circuit comprises a resistor R4, a resistor R5, a resistor R11, a resistor R14, a resistor R15, a resistor R16, a capacitor C3, a first switching tube, a second switching tube, an LED and a driving chip;

the non-control end and the grounding end of the driving chip are both grounded, the power input end of the driving chip is the first control end of the LED driving unit and is grounded through the resistor R11, the output current detection end of the driving chip is simultaneously connected with one end of the resistor R5 and one end of the resistor R4, the other end of the resistor R5 and the other end of the resistor R4 are simultaneously grounded, the output current detection end of the driving chip is also connected with the current input end of the second switch tube, the current output end of the second switch tube is grounded through the resistor R15, the control end of the second switch tube is the second control end of the LED driving unit and is grounded through the resistor R14, the external driving end of the driving chip is connected with the control end of the first switch tube, and the current output end of the first switch tube is connected with the output current detection end of the driving chip, the current input end of the first switch tube is connected with one end of the resistor R16, the other end of the resistor R16 is connected with the cathode of the light emitting diode LED, and the anode of the light emitting diode LED is the power supply end of the LED driving unit and is grounded through the capacitor C3.

7. The circuit of claim 6, wherein the first switching tube and the second switching tube are both N-type MOS tubes;

the drain electrode of the N-type MOS tube is the current input end of the first switch tube or the second switch tube, the source electrode of the N-type MOS tube is the current output end of the first switch tube or the second switch tube, and the grid electrode of the N-type MOS tube is the control end of the first switch tube or the second switch tube.

8. The circuit of claim 1, wherein the switch unit is a key switch, a touch switch, a toggle switch, a rotary switch, or an inductive switch;

the key switch, the press touch switch, the toggle switch or one conducting end of the induction switch is the output end of the switch unit, and the other conducting end of the key switch, the press touch switch, the toggle switch or the induction switch is grounded.

9. The miniature explosion-proof flashlight is characterized by comprising a lamp body barrel, wherein the lamp body barrel is internally provided with the miniature lamp control circuit according to any one of claims 1 to 8, one end of the lamp body barrel is provided with a lamp holder barrel, the other end of the lamp body barrel is provided with a tail cover, the cross section of the end part of the lamp holder barrel is provided with a transparent part for transmitting light, the transparent part is fixedly connected with the lamp holder barrel through a lamp holder pressing ring, the surface of the lamp body barrel is also externally leaked with the USB interface, the USB interface is covered with a USB plug, the USB plug is connected with the surface of the lamp body barrel, the surface of the lamp body barrel is also provided with an electric quantity display window for displaying the electric quantity of a battery, and the tail cover is provided with a switch component for switching on and off the light and the electric quantity display of the lamp.