CN102612222A

CN102612222A - LED (light emitting diode) light adjusting flashlight made by time-base circuit

Info

Publication number: CN102612222A
Application number: CN2012100537012A
Authority: CN
Inventors: 刘昭利
Original assignee: Individual
Current assignee: Individual
Priority date: 2012-03-03
Filing date: 2012-03-03
Publication date: 2012-07-25

Abstract

The invention provides an LED (light emitting diode) light adjusting flashlight made by a time-base circuit, which comprises a 6V direct current power supply, a self-excited oscillator circuit, a pulse width modulation circuit, a square-wave pulse amplifying circuit and six white LEDs, and a time-based circuit IC1 with an NE555 mode is adopted. In order to overcome the defects that the common battery filament lamp flashlight is large in volume, large in electricity consumption and low in lightness, the LED light adjusting flashlight utilizes the common rechargeable battery or four Number 5 alkaline batteries to light the six white LEDs with ultra-high lightness, so that the LED light adjusting flashlight is suitable for night lighting for homes, camping, outside travelling and the like. The LED light adjusting flashlight made by the time-based circuit adopts the time-based circuit with the NE555 mode as a core element and adopts a using method of the pulse width modulation circuit (namely PWM) to adjust the lightness of the LEDs, so that an energy-saving, environment-friendly, economic and practical technical scheme is realized.

Description

The LED light modulation flashlight of time spent base circuit production

Technical field

The invention belongs to electronic technology and LED applied technical field, is the LED light modulation flashlight about a kind of time spent base circuit production.

Background technology

Common two batteries incandescent lamp flashlight operating current >=240mA; And the flashlight operating current made from LED only has 50mA; The power that the ordinary incandescent lamp flashlight is consumed is 4～6 times of LED flashlight power approximately, and luminous brightness also can not show a candle to the LED flashlight.

Have in order to overcome common batteries incandescent lamp flashlight that volume is big, power consumption is big and the low defective of brightness; The LED light modulation flashlight of time spent base circuit production of the present invention uses common rechargeable battery or No. 5 alkaline batteries of 4 joints; Just can light 6 super brightness white light-emitting diodes; 4 joint alkaline batteries No. 5 common batteries generally can use more than 40 days, are applicable at home, camp, night lighting such as out on tours.

What core parts adopted in the LED light modulation flashlight circuit of time spent base circuit production of the present invention is the NE555 time-base circuit; The brightness of light modulation LED; Method for using is pulse width modulation circuit (that is: PWM), is a kind of energy-saving and environmental protection, economic, practical technical scheme.

Below specify the correlation technique content that the LED light modulation flashlight of time spent base circuit production of the present invention relates in implementation process.

Summary of the invention

Goal of the invention and beneficial effect: have in order to overcome common two batteries incandescent lamp flashlights that volume is big, power consumption is big and the low defective of brightness; The LED light modulation flashlight of time spent base circuit production of the present invention uses common rechargeable battery or No. 5 alkaline batteries of 4 joints; Just can light 6 super brightness white light-emitting diodes; 4 joint alkaline batteries No. 5 common batteries generally can use more than 40 days, are applicable at home, camp, night lighting such as out on tours.

The operation principle of circuit: the time spent LED light modulation flashlight of base circuit production is made up of 6V DC power supply, self-excited oscillator circuit and pulse width modulation circuit, square-wave pulse amplifying circuit and illuminating circuit; Behind the self-excited oscillator circuit working; The 3rd pin output square-wave pulse by time-base circuit IC1; Holding time of positive pulse and negative pulse regulated through pulse width modulation circuit, thereby changes the frequency of square-wave pulse; Modulation back square-wave pulse signal carries out power amplification through the square-wave pulse amplifying circuit again, and it is luminous to promote 6 super bright white-light luminescent component LED at last.

Technical characterictic: the LED light modulation flashlight of time spent base circuit production, it is made up of 6V DC power supply, self-excited oscillator circuit and pulse width modulation circuit, square-wave pulse amplifying circuit and 6 white light-emitting diodes, and its characteristic comprises:

Self-excited oscillator circuit and pulse width modulation circuit: form by time-base circuit IC1, capacitor C 1, linear potentiometer RP, switching diode D1, switching diode D2 and resistance R 1; The model that time-base circuit IC1 selects for use is NE555; The 7th pin of time-base circuit IC1 connects the positive pole of switching diode D1, the negative pole of switching diode D2 and an end of resistance R 1; The anodal VCC of the other end connection circuit of the 4th pin of time-base circuit IC1 and the 8th pin and resistance R 1; The negative pole of switching diode D1 connects the end of potentiometer RP; The positive pole of switching diode D2 connects the other end of potentiometer RP, the 2nd pin of the movable knee-joint time-base circuit IC1 of potentiometer RP and an end of the 6th pin and capacitor C 1, the 1st pin connection circuit ground GND of the other end of capacitor C 1 and time-base circuit IC1;

Square-wave pulse amplifying circuit and illuminating circuit: form by NPN transistor VT1, resistance R 2 and white light-emitting diode LED1～LED6; The end of the 3rd pin connecting resistance R2 of time-base circuit IC1; The base stage of another termination NPN transistor VT1 of resistance R 2; White light-emitting diode LED1～LED3 connects each other, and white light-emitting diode LED4～LED6 connects each other, the anodal VCC of the anodal connection circuit of the positive pole of white light-emitting diode LED1 and white light-emitting diode LED4; The negative pole of the negative pole of white light-emitting diode LED3 and white light-emitting diode LED6 connects the collector electrode of NPN transistor VT1, the emitter connection circuit ground GND of NPN transistor VT1.

The 6V dc power anode links to each other with circuit anode VCC, and the 6V dc power cathode links to each other with circuit ground GND.

Description of drawings

Accompanying drawing 1 is the embodiment circuit working schematic diagram that the present invention provides the LED light modulation flashlight of a time spent base circuit production.

Embodiment

Circuit working schematic diagram and description of drawings according to the LED light modulation flashlight of time spent shown in the accompanying drawing 1 base circuit production; And according to the annexation between the components and parts in the described each several part circuit of summary of the invention, and the components and parts technical parameter described in the execution mode requires to implement to realize the present invention.

The selection of components and parts and technical parameter thereof

IC1 is a time-base circuit, and its model is NE555, is encapsulated as 8 pin DIP, each pin function: 1 pin is circuit ground GND; 2 pin are trigger end; 3 pin outputs; 4 pin preset ends; 5 pin are control voltage; 6 pin thresholdings (threshold value); 7 pin are discharge end; 8 pin are positive source VCC;

VT1 is a NPN transistor, and the model of selecting for use is 2SC9013;

D1, D2 are switching diode, and the model of selecting for use is 1N4148;

Resistance uses metalfilmresistor, and power is 1/8W, and the resistance of resistance R 1 is 510 Ω; The resistance of resistance R 2 is 820 Ω;

RP potentiometer, its resistance are 51K Ω;

C1 electric capacity of the dacron, its capacity all are 0.1 μ F;

LED1～LED6 is ￠ 5 super brightness white light-emitting diodes, requires technical parameter consistent as far as possible.

Circuit production main points and circuit debugging

Very simple because of the LED light modulation flashlight circuit structure of time spent base circuit production, make than be easier to, it is general that the physical connection of components and parts is correct as long as the components and parts performance of use is intact, circuit just need not debugged especially can operate as normal;

In circuit debugging, the 6V DC power supply can be earlier with the adjustable stabilized voltage supply replacement of output current >=0.5A, if find that output current does not reach 50mA, whether the resistance that should detect resistance R 2 earlier changes, or the resistance of resistance R 2 is suitably reduced to try it;

The output voltage adjustment: should make the collector electrode of NPN transistor VT1 and the voltage >=4.8V between the circuit ground GND, if the about 45～50mA of loaded work piece electric current is the excessive resistance that should suitably increase the resistance of resistance R 1 or increase resistance R 2 of electric current.

Claims

1. the LED light modulation flashlight of time spent base circuit production, it is made up of 6V DC power supply, self-excited oscillator circuit and pulse width modulation circuit, square-wave pulse amplifying circuit and 6 white light-emitting diodes, and its characteristic comprises:

Self-excited oscillator circuit and pulse width modulation circuit are made up of time-base circuit IC1, capacitor C 1, linear potentiometer RP, switching diode D1, switching diode D2 and resistance R 1; The model that time-base circuit IC1 selects for use is NE555; The 7th pin of time-base circuit IC1 connects the positive pole of switching diode D1, the negative pole of switching diode D2 and an end of resistance R 1; The anodal VCC of the other end connection circuit of the 4th pin of time-base circuit IC1 and the 8th pin and resistance R 1; The negative pole of switching diode D1 connects the end of potentiometer RP; The positive pole of switching diode D2 connects the other end of potentiometer RP, the 2nd pin of the movable knee-joint time-base circuit IC1 of potentiometer RP and an end of the 6th pin and capacitor C 1, the 1st pin connection circuit ground GND of the other end of capacitor C 1 and time-base circuit IC1;

Square-wave pulse amplifying circuit and illuminating circuit are made up of NPN transistor VT1, resistance R 2 and white light-emitting diode LED1～LED6; The end of the 3rd pin connecting resistance R2 of time-base circuit IC1; The base stage of another termination NPN transistor VT1 of resistance R 2; White light-emitting diode LED1～LED3 connects each other, and white light-emitting diode LED4～LED6 connects each other, the anodal VCC of the anodal connection circuit of the positive pole of white light-emitting diode LED1 and white light-emitting diode LED4; The negative pole of the negative pole of white light-emitting diode LED3 and white light-emitting diode LED6 connects the collector electrode of NPN transistor VT1, the emitter connection circuit ground GND of NPN transistor VT1.

2. the LED light modulation flashlight of time spent base circuit production according to claim 1, it is characterized in that: the 6V dc power anode links to each other with circuit anode VCC, and the 6V dc power cathode links to each other with circuit ground GND.