CN216057557U

CN216057557U - Moonlight gear control circuit for mobile illumination

Info

Publication number: CN216057557U
Application number: CN202121192867.3U
Authority: CN
Inventors: 王勇
Original assignee: Dongguan Aolei Mobile Lighting Equipment Co Ltd
Current assignee: Dongguan Aolei Mobile Lighting Equipment Co Ltd
Priority date: 2021-05-31
Filing date: 2021-05-31
Publication date: 2022-03-15
Anticipated expiration: 2031-05-31

Abstract

The utility model discloses a moonlight gear control circuit for mobile lighting, which comprises a single chip microcomputer, a power supply module and a current control module, wherein the single chip microcomputer is connected with the power supply module; the single chip microcomputer is connected with the power supply module and the current control module; the current control module is connected with the power supply module and is used for controlling the power supply frequency of the power supply module; the current control module comprises an operational amplifier, and the operational amplifier is used for inputting a PWM control signal to control the power supply module. In the moonlight gear of the flashlight, the singlechip does not need to start the timer to output PWM signals, and only needs to output a high level to control, so that the singlechip can enter the dormancy state in the moonlight gear, the dormancy current of the MCU is relatively low, the moonlight gear efficiency is greatly improved, the moonlight gear endurance time of the same battery is prolonged, and the circuit is simple and practical.

Description

Moonlight gear control circuit for mobile illumination

Technical Field

The utility model relates to the field of mobile lighting equipment, in particular to a moonlight level control circuit for mobile lighting.

Background

When the conventional common flashlight circuit controls and controls the moonlight gear, the MCU outputs a small PWM signal to be input to the reverse input end of the operational amplifier, and according to the voltage V-of the reverse input end, the virtual short virtual disconnection of the operational amplifier is realized, namely the voltage of the same-direction input end is the same, and V + = V-, so that when the current detection resistor determines the corresponding resistance value R, the current of the output load is I = V +/R, and when the flashlight needs to light different brightness, the MCU only needs to give corresponding PWM.

When the flashlight is controlled by the mode, the singlechip needs to start the timer and output a PWM signal for control, so that the singlechip cannot be in dormancy even in the moonlight gear, the current required by the MCU during working is higher and milliampere level, and the current for lightening the moonlight gear lamp bead is also in milliampere level, so that the moonlight gear efficiency is lower, and the moonlight gear endurance time of the same battery is much shorter.

Disclosure of Invention

The utility model aims to provide a moonlight level control circuit for mobile lighting.

The technical scheme adopted by the utility model for solving the technical problems is as follows:

a moonlight gear control circuit for mobile lighting comprises a single chip microcomputer, a power supply module and a current control module;

the single chip microcomputer is connected with the power supply module and the current control module;

the power supply module is connected with the LED and used for supplying power,

the current control module is connected with the power module and is used for controlling the power supply frequency of the power module;

the current control module comprises an operational amplifier, and the operational amplifier is used for inputting a PWM control signal to control the power supply module.

Further, the LED is grounded through a series resistance circuit;

the resistance circuit comprises an MOS tube and a first resistor, wherein the MOS tube and the first resistor are connected with a current detection resistor in parallel.

Further, the MOS tube is of an N type, a drain electrode of the MOS tube is connected with the LED, a source electrode of the MOS tube is connected with the ground through a series resistor, a grid electrode of the MOS tube is connected with a pin of the single chip microcomputer, and the single chip microcomputer controls the MOS tube to be switched on and off.

Furthermore, the output end of the operational amplifier is connected with the power module, the homodromous input end of the operational amplifier is connected with the LED, and the reverse input end of the operational amplifier is connected with the pin of the single chip microcomputer through the divider resistor.

Furthermore, the singlechip is provided with a PWM end, and the PWM generating end is connected with the reverse input end of the operational amplifier through a resistor.

Further, still include steady voltage IC, steady voltage IC is located between power module and the singlechip.

By applying the technical scheme of the utility model, in the moonlight gear of the flashlight, the singlechip does not need to start the timer to output PWM signals, and only needs to output a high level to control, so that the singlechip can enter the dormancy state in the moonlight gear, and the dormancy current of the MCU is smaller, thus the moonlight gear efficiency is greatly improved, the moonlight gear endurance time of the same battery is prolonged, and the circuit is simple and practical.

Additional features and advantages of the utility model will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model. The objectives and other advantages of the utility model will be realized and attained by the structure particularly pointed out in the written description and drawings.

Drawings

The present invention will be described in detail below with reference to the accompanying drawings so that the above advantages of the present invention will be more apparent.

FIG. 1 is a circuit diagram of a power module and a current control module according to the present invention;

FIG. 2 is a circuit diagram of the present invention for connecting a single chip microcomputer;

fig. 3 is a circuit diagram of a regulator IC connection of the present invention.

Detailed Description

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be connected or detachably connected or integrated; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

As shown in fig. 1-3, a moonlight level control circuit for mobile lighting comprises a single chip microcomputer U3, a power supply module and a current control module;

the single chip microcomputer U3 is connected with the power supply module and the current control module;

the power supply module is connected with the LEDD1 and used for supplying power,

In this embodiment, the LEDD1 is grounded through a series resistor circuit;

the resistance circuit comprises a MOS (metal oxide semiconductor) tube connected with a current detection resistor R2 in parallel and a first resistor R1. The resistance value of the first resistor R1 is smaller than that of the current detection resistor R2.

When the flashlight is unlocked at any time, a user turns on the flashlight for a long time by pressing a side key of the flashlight, the flashlight can enter a flashlight moon light gear mode, a 6 th pin RA1 of the single chip microcomputer U3 outputs high level to CON, voltage is divided by a resistor R8 and a resistor R6, the voltage value obtained by voltage division is V-, so that the voltage V-at the reverse input end of the operational amplifier is equal to the voltage division value of the resistor R6 and the resistor R8, and the voltage V + at the homodromous input end of the operational amplifier is equal to V-at the moment according to the virtual short virtual break principle of operational amplifier. Thus, the main circuit outputs voltage and current through VOUT +, D1, VOUT-, R2 to ground forming path, the moonlight level of the flashlight is opened, and the moonlight level current: i = V-/R2.

In this embodiment, the MOS transistor Q1 is of an N type, a drain of the MOS transistor is connected to the led d1, a source series resistor R1 is grounded, a gate of the MOS transistor is connected to a pin of the single chip microcomputer U3, and the single chip microcomputer U3 controls the on and off of the MOS transistor. The moonlight gear is detected with current detection resistance R2, because the moonlight current ratio is less, the resistance can be correspondingly great, the voltage that detects like this reaches the input voltage of fortune and puts comparatively accurately, MOS pipe Q1 is used for switching other gears, when needing to switch from moonlight gear to other gears, MCU need give a high level promptly to MOON can, because other gear currents are great relatively, so R1 resistance value is less milliohm rank, loss on the resistance is just little like this, the little efficiency of loss can be high.

In this embodiment, the output end of the operational amplifier is connected with the power module, the equidirectional input end of the operational amplifier is connected with the LEDD1, and the reverse input end of the operational amplifier is connected with the pin of the single chip microcomputer U3 through the divider resistor. The power module includes, battery BT1 and power chip DC-DC enter flashlight month light shelves mode, and singlechip U3 7 th foot RA0 mouth output high level for enabling signal EN goes to control DC-DC power chip work this moment, and singlechip U3 5 th foot RA2 mouth output low level control MOS pipe Q1 closes.

In this embodiment, the single chip microcomputer U3 is provided with a PWM terminal, and the PWM generating terminal is connected to the inverting input terminal of the operational amplifier through a resistor. And a 3 rd pin RA4 of the singlechip U3 is configured to be in a high-impedance state when in a moonlight gear, and is used for controlling other gears.

In this embodiment, still include steady voltage IC, steady voltage IC is located between power module and singlechip U3. Is used for providing stable power supply for the singlechip U3.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the utility model. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. a moonlight profile control circuit for mobile lighting, is characterized in that, comprises single chip microcomputer, power supply module and current control module;

The single-chip microcomputer is connected with the power supply module and the current control module;

The power module is connected to the LED for power supply,

The current control module is connected with the power module, and is used for controlling the power supply frequency of the power module;

Wherein, the current control module includes an operational amplifier, and the operational amplifier is used for inputting a PWM control signal to control the power module.

2. The moonlight profile control circuit for mobile lighting according to claim 1, wherein the LED is grounded through a series resistance circuit;

Wherein, the resistance circuit includes a MOS transistor and a first resistor connected in parallel with a current-sensing resistor.

3. The moonlight profile control circuit for mobile lighting according to claim 2, wherein the MOS tube is an N-type, the drain of the MOS tube is connected to the LED, the source is connected to the ground with a series resistance, and the gate is connected to the single-chip microcomputer. The pin is connected, and the single-chip microcomputer controls the conduction and cut-off of the MOS tube.

4. The moonlight profile control circuit for mobile lighting according to claim 3, wherein the output end of the operational amplifier is connected to a power module, the same-direction input end is connected to an LED, and the opposite input end is connected through a voltage divider resistor MCU pins.

5 . The moonlight profile control circuit for mobile lighting according to claim 3 , wherein the single-chip microcomputer is provided with a PWM terminal, and the PWM generating terminal is connected to the reverse input terminal of the operational amplifier through a resistor. 6 .

6 . The moonlight profile control circuit for mobile lighting according to claim 1 , further comprising a voltage regulator IC, the voltage regulator IC being located between the power supply module and the single-chip microcomputer. 7 .