CN207251971U

CN207251971U - A kind of gradually bright LED light

Info

Publication number: CN207251971U
Application number: CN201721302203.1U
Authority: CN
Inventors: 冯平
Original assignee: Guangxi University of Science and Technology
Current assignee: Guangxi University of Science and Technology
Priority date: 2017-10-10
Filing date: 2017-10-10
Publication date: 2018-04-17
Anticipated expiration: 2027-10-10

Abstract

The utility model provides a kind of gradually bright LED light, which forms pulse wave generator by 555 chips, produces duty cycle and edges up with the time high impulse wave, for driving LED to shine, when power switch just closes, it is low to produce impulse wave duty cycle, LED luminosity is low, over time, produce impulse wave duty cycle to edge up height, LED luminosity gradually improves, finally, pulse wave generator stops oscillation, and exports constant high level driving LED, LED is entered most bright working status.This gradually bright LED light, by continuous gradation mode, makes LED light that this LED light are used as night bedside lamp by glimmer to normal brightness transition, can reduce the night stimulation of light to human eye when turning on light.

Description

A kind of gradually bright LED light

Technical field

A kind of gradually bright LED light is the utility model is related to, belongs to electronic technology field.

Background technology

In actual life, that moment when night, which gets up, opens headlamp, the eyes that unexpected light often gives people cause Strong impulse, allows people to feel quite uncomfortable.A kind of utility model patent " light controller (application number to brighten step by step 201520837537.3) a kind of device " is described, is brightened step by step function the arrangement achieves lamp, but the device only provides two-stage Brightness change, therefore, effect are not good enough.

Utility model content

The utility model provides a kind of gradually bright LED light, it makes LED light by glimmer to just by continuous gradation mode Normal luminance transition, improves the comfort level of human eye.

The concrete technical scheme that the utility model is taken is as follows：

A kind of gradually bright LED light, it is characterized in that：The lamp include 555 chip U1, switch K1, resistance R1~R3, capacitance C1 and C2, diode D1 and light emitting diode D2, wherein the cathode of a termination+5V power supplys of switch K1, another termination for switching K1 is electric Hold cathode, 4 feet and 8 feet of 555 chip U1 of C1；One end of the anode connecting resistance R1 of capacitance C1, another termination 555 of resistance R1 The cathode of 7 feet of chip U1, one end of resistance R2 and diode D1；2 feet and 6 feet of the 555 chip U1 of another termination of resistance R2, The anode of diode D1 and one end of capacitance C2, the other end ground connection of capacitance C2；3 feet of 555 chips of termination of resistance R3, electricity Hinder the cathode of the other end sending and receiving optical diode D2 of R3, the anode ground connection of light emitting diode D2；The 1 foot ground connection of 555 chips, 5 feet Vacantly；Light emitting diode D2 uses illuminating LED.

The beneficial effects of the utility model are：The utility model provides a kind of gradually bright LED light, it can be by continuously gradually Change mode, makes LED light by glimmer to normal brightness transition, and by this, gradually bright LED light is used as night bedside lamp, can reduce night and open Stimulation of the light to human eye during lamp.

Brief description of the drawings

Fig. 1 is the circuit diagram of the utility model.

Embodiment

The utility model is described further below in conjunction with the accompanying drawings.

As shown in Figure 1, a kind of gradually bright LED light, including 555 chip U1, switch K1, resistance R1~R3, capacitance C1 and C2, Diode D1 and light emitting diode D2, wherein switching the cathode of a termination+5V power supplys of K1, switchs another termination capacitor C1 of K1 Cathode, 4 feet and 8 feet of 555 chip U1；One end of the anode connecting resistance R1 of capacitance C1,555 chip of another termination of resistance R1 The cathode of 7 feet of U1, one end of resistance R2 and diode D1；2 feet of the 555 chip U1 of another termination of resistance R2 and 6 feet, two poles The anode of pipe D1 and one end of capacitance C2, the other end ground connection of capacitance C2；3 feet of 555 chips of termination of resistance R3, resistance R3 Other end sending and receiving optical diode D2 cathode, light emitting diode D2 anode ground connection；The 1 foot ground connection of 555 chips, 5 feet are hanging； Light emitting diode D2 uses illuminating LED.

When switching K1 connections, positive supply charges C2 through C1, R1 and D1, when C2 voltages are less than the three of positive voltage When/mono-, 3 feet of 555 chip U1 export high level, and light emitting diode D2 is bright；When C2 voltages exceed three points of positive voltage Two after, 3 feet of 555 chip U1 output low level, light emitting diode D2 goes out, meanwhile, C2 passes through R2 and 7 feet of 555 chip U1 Electric discharge；As C2 discharges, when C2 voltages are also between 1/3rd of positive voltage and 2/3rds, 555 chip U1 3 feet maintain low level output, light emitting diode D2 goes out；When C2 electric discharges make 1/3rd of its voltage as low as positive voltage When, 3 feet of 555 chip U1 export high level again, and light emitting diode D2 is bright, and capacitance C2 is started to charge up again.

Since the charging resistor R1 of capacitance C2 is only 1/5th of discharge resistance R2, it is right when switch K1 just closes The charging rate of C2 is fast, and the velocity of discharge is slow, and the impulse wave duty cycle of the 3 feet output of 555 chip U1 is small, and light emitting diode D2 shines Brightness it is low；As the time elapses, be serially connected with charge circuit capacitance C1 it is charged pressure it is higher and higher, its partial pressure act on increasingly Substantially, positive supply is less and less to the charging current of C2 through C1, R1 and D1, slower and slower equivalent to the charging rate to C2, and 555 The impulse wave duty cycle of the 3 feet output of chip U1 gradually improves, and the brightness that light emitting diode D2 shines also gradually improves；Finally, C1 becomes In fully charged, go to zero to the charging current of C2,555 chip U1 stop oscillation, its 3 foot maintains output high level, light-emitting diodes Pipe D2 continuous illuminations, into high-high brightness working status.

Claims

1. a kind of gradually bright LED light, it is characterized in that：The lamp include 555 chip U1, switch K1, resistance R1~R3, capacitance C1 and C2, diode D1 and light emitting diode D2, wherein the cathode of a termination+5V power supplys of switch K1, another termination for switching K1 is electric Hold cathode, 4 feet and 8 feet of 555 chip U1 of C1；One end of the anode connecting resistance R1 of capacitance C1, another termination 555 of resistance R1 The cathode of 7 feet of chip U1, one end of resistance R2 and diode D1；2 feet and 6 feet of the 555 chip U1 of another termination of resistance R2, The anode of diode D1 and one end of capacitance C2, the other end ground connection of capacitance C2；3 feet of 555 chips of termination of resistance R3, electricity Hinder the cathode of the other end sending and receiving optical diode D2 of R3, the anode ground connection of light emitting diode D2；The 1 foot ground connection of 555 chips, 5 feet Vacantly；Light emitting diode D2 uses illuminating LED.