CN103415129A

CN103415129A - LED (Light Emitting Diode) flashlight with delay and automatic power off functions

Info

Publication number: CN103415129A
Application number: CN201310396336XA
Authority: CN
Inventors: 黄宇嵩
Original assignee: Individual
Current assignee: Individual
Priority date: 2013-09-03
Filing date: 2013-09-03
Publication date: 2013-11-27

Abstract

The invention relates to an LED (Light Emitting Diode) flashlight with delaying and automatic power off functions. The flashlight is characterized by comprising a 4V direct current power supply, a delaying automatic power off circuit and an LED driving circuit, wherein one end of a button switch AN in the delaying automatic power off circuit is connected with the positive pole VCC (Voltage To Current Converter) of the circuit, while the other end of the button switch AN is connected with the positive pole of an electrolytic capacitor C1 and one end of a resistor R1 through a resistor R2, and the negative pole of the electrolytic capacitor C1 and the other end of the R1 are connected with ground GND. According to the LED flashlight with the delaying and automatic power off functions provided by the invention, based on maintaining all advantages of the LED flashlight, the delaying and automatic power off functions are added to suit the demands on delaying or energy saving in some special occasions and time frames. The circuit provided by the invention can be further used for controlling artificial circuits or resistive and inductive loads and the like, and the working performance of the flashlight is stable and reliable.

Description

LED torch with time delay automatic circuit break function

Technical field

The invention belongs to new type light source and electronic technology field, is the LED torch that has the time delay automatic circuit break function about a kind of.

Background technology

Tradition is used the operating current >=240mA of two batteries incandescent lamp flashlights, 4 LED flashlight operating current≤80mA, the power that the ordinary incandescent lamp flashlight consumes is approximately 3～4 times of 4 LED flashlights, and the luminosity of incandescent lamp flashlight can not show a candle to the LED flashlight.Also have, the effective operating voltage of the battery of incandescent lamp flashlight is much larger than the LED flashlight.

To exist power consumption large in order to change traditional two batteries incandescent lamp flashlights, and the low defect of brightness, and the flashlight that comprehensively uses LED to make has become a kind of development trend.

LED torch with time delay automatic circuit break function of the present invention, in all advantages that keep LED torch, it is basis, increase the function of time delay and auto-breaking, adapted to the time delay of some special occasions, special period or the needs of the aspect such as energy-conservation with this.

Circuit of the present invention also can be used for control simulation circuit or resistive, inductive even load, its stable and reliable working performance.

Below describe the LED torch with time delay automatic circuit break function of the present invention related correlation technique content in implementation process in detail.

Summary of the invention

Goal of the invention and beneficial effect: the LED torch with time delay automatic circuit break function of the present invention, in all advantages that keep LED torch, it is basis, increase the function of time delay and auto-breaking, adapted to the time delay of some special occasions, special period or the needs of the aspect such as energy-conservation with this.Circuit of the present invention also can be used for control simulation circuit or resistive, inductive even load, its stable and reliable working performance.

Circuit working principle: after clicking key switch AN, the 4V DC power supply is charged to electrochemical capacitor C1 rapidly by resistance R 2, when on electrochemical capacitor C1, filling to obtain voltage during higher than the conducting valve threshold voltage of the grid G of enhancement mode N channel field-effect pipe VT1, enhancement mode N channel field-effect pipe VT1 starts conducting, and now the 4V DC power supply is powered to LED 1～LED4.At this moment if the voltage on electrochemical capacitor C1 higher than the conducting valve threshold voltage of enhancement mode N channel field-effect pipe VT1, enhancement mode N channel field-effect pipe VT1 just continues to keep conducting state, along with electrochemical capacitor C1 discharges to resistance R 1, when the voltage on electrochemical capacitor C1 during lower than enhancement mode N channel field-effect pipe VT1 conducting valve threshold voltage, enhancement mode N channel field-effect pipe VT1 cut-off, LED 1～LED4 extinguishes thereupon.If before enhancement mode N channel field-effect pipe VT1 cut-off, again click key switch AN, can continue ON time cycle of enhancement mode N channel field-effect pipe VT1.The time in circuit turn-on cycle is long and short by 3 factors decisions: the one, and the size of electrochemical capacitor C1 discharge loop discharge resistance R1 resistance; The 2nd, the capacity of electrochemical capacitor C1; The 3rd, DC power supply voltage high and low.

Technical characterictic: have the LED torch of time delay automatic circuit break function, it comprises 4V DC power supply, time delay automatic power-off circuit, and LED driving circuit is characterized in that:

The time delay automatic power-off circuit: it is comprised of key switch AN, resistance R 2, electrochemical capacitor C1 and resistance R 1, the anodal VCC of the termination circuit of key switch AN, the other end of key switch AN connects the positive pole of electrochemical capacitor C1 and an end of resistance R 1 by resistance R 2, the other end connection circuit ground GND of the negative pole of electrochemical capacitor C1 and resistance R 1;

LED driving circuit: it is by enhancement mode N channel field-effect pipe VT1, LED 1～LED4 forms, the grid G of enhancement mode N channel field-effect pipe VT1 connects the positive pole of electrochemical capacitor C1, the source S connection circuit ground GND of enhancement mode N channel field-effect pipe VT1, the anodal VCC of the anodal connection circuit of the positive pole of LED 1 and LED 3, the positive pole of the negative pole sending and receiving optical diode LED2 of LED 1, the positive pole of the negative pole sending and receiving optical diode LED4 of LED 3, the negative pole of the negative pole of LED 2 and LED 4 connects the drain D of enhancement mode N channel field-effect pipe VT1,

The 4V DC power supply is used 2 group storage batteries to be composed in series, the anodal VCC of the anodal connection circuit of 4V DC power supply, the negative pole connection circuit ground GND of 4V DC power supply.

The accompanying drawing explanation

Accompanying drawing is embodiment circuit working schematic diagram of LED torch with time delay automatic circuit break function provided by the invention.

Embodiment

According to LED torch circuit working schematic diagram and the accompanying drawing explanation with time delay automatic circuit break function shown in the drawings, and according to annexation between components and parts in the described each several part circuit of summary of the invention, and the components and parts technical parameter described in execution mode requires and the circuit production main points are implemented to realize the present invention, below in conjunction with embodiment, correlation technique of the present invention is further described.

The selection of components and parts and technical parameter thereof

The present invention is under the condition of power supply of 4V storage battery, and the resistance of resistance R 1 is 20M Ω, and the resistance of resistance R 2 is 220 Ω, and the capacity of electrochemical capacitor C1 is 22 μ F/10V, and the ON time of enhancement mode N channel field-effect pipe VT1 is about 1 minute.Need to extend or shorten ON time, increase that can be suitable or the capacitance of minimizing electrochemical capacitor C1, the resistance of resistance R 1.But be noted that the capacity that increases electrochemical capacitor C1, suitably adjust the resistance of current-limiting resistance R2, in order to avoid the electrochemical capacitor C1 charging interval is long, accumulators causes long term overloading to impact;

Enhancement mode N channel field-effect pipe VT1 is according to how many selections of light-emitting diode, and the present invention uses 4 LEDs, and enhancement mode N channel field-effect pipe VT1 can select the models such as BS170, and its maximum operating currenbt is 150mA; Large current load can be selected the field effect transistor such as IRF540, and its maximum operating currenbt is 1A.The field effect transistor of these two kinds of models under conducting state, between the source S of field effect transistor, drain D pressure drop all very little, basically can ignore;

LED1～LED4 is light-emitting diode, selects 4 super bright white light-emitting diodes of ￠ 5.

Circuit production main points and circuit debugging

According to LED torch circuit working schematic diagram and the accompanying drawing explanation with time delay automatic circuit break function shown in the drawings, and according to annexation between components and parts in the described each several part circuit of summary of the invention, and the components and parts technical parameter described in execution mode requires and the circuit production main points are implemented to realize the present invention;

The present invention also can be used for control simulation circuit or resistance, inductive load, its stable and reliable working performance.

Claims

1. LED torch with time delay automatic circuit break function, it comprises 4V DC power supply, time delay automatic power-off circuit, LED driving circuit is characterized in that:

Described time delay automatic power-off circuit is comprised of key switch AN, resistance R 2, electrochemical capacitor C1 and resistance R 1, the anodal VCC of the termination circuit of key switch AN, the other end of key switch AN connects the positive pole of electrochemical capacitor C1 and an end of resistance R 1 by resistance R 2, the other end connection circuit ground GND of the negative pole of electrochemical capacitor C1 and resistance R 1;

Described LED driving circuit is by enhancement mode N channel field-effect pipe VT1, LED 1～LED4 forms, the grid G of enhancement mode N channel field-effect pipe VT1 connects the positive pole of electrochemical capacitor C1, the source S connection circuit ground GND of enhancement mode N channel field-effect pipe VT1, the anodal VCC of the anodal connection circuit of the positive pole of LED 1 and LED 3, the positive pole of the negative pole sending and receiving optical diode LED2 of LED 1, the positive pole of the negative pole sending and receiving optical diode LED4 of LED 3, the negative pole of the negative pole of LED 2 and LED 4 connects the drain D of enhancement mode N channel field-effect pipe VT1,

Described 4V DC power supply is used 2 group storage batteries to be composed in series, the anodal VCC of the anodal connection circuit of 4V DC power supply, the negative pole connection circuit ground GND of 4V DC power supply.