CN101562923A

CN101562923A - LED control device

Info

Publication number: CN101562923A
Application number: CNA200810036050XA
Authority: CN
Inventors: 陈瑞家
Original assignee: SHANGHAI EL LIGHT CO Ltd
Current assignee: SHANGHAI EL LIGHT CO Ltd
Priority date: 2008-04-15
Filing date: 2008-04-15
Publication date: 2009-10-21

Abstract

The invention relates to an LED control device which belongs to the technical field of illuminating electronics and solves the technical problem that brightness decay is quickened when an LED is usually lightened to influence the service life. The LED control device comprises a power supply voltage-stabilizing filtering unit and an LED lamp and also comprises a singlechip control unit capable of producing high-frequency duty factor variable square wave pulses, wherein the pulse output end of the singlechip control unit is connected with the LED lamp through an electric switch unit, and the power supply voltage-stabilizing filtering unit supplies electricity for the singlechip control unit; the singlechip control unit controls the electric switch unit to close and open through the produced high-frequency square wave pulses so as to lead the LED lamp to high-frequently twinkle following the square wave pulse. The LED control device can slow down the brightness decay of an LED, thereby prolonging the service life without influencing normal use.

Description

A kind of LED control device

Technical field

The present invention relates to the electronic technology field that throws light on, particularly relate to a kind of technology of LED control device.

Background technology

Because it is fairly obvious that LED compares the advantage of conventional lamp environmental protection and energy saving, and the life-span is also long relatively, so its purposes is very extensive, all can see the LED product from industry to civilian.But because also there is certain limitation in the LED manufacturing technology, when lighting LED, the brightness decay meeting of lamp is accelerated, thereby influences the useful life of LED product when long-time continual.

Summary of the invention

At the defective that exists in the above-mentioned prior art, technical problem to be solved by this invention provides and a kind ofly can not influence its normal use, and can slow down the decay of LED brightness, thus the LED control device that prolongs its useful life.

In order to solve the problems of the technologies described above, a kind of LED control device provided by the present invention, comprise power supply voltage regulation filtering unit and LED lamp, it is characterized in that: comprise that also one can produce the Single-chip Controlling unit of high frequency duty ratio variable square-wave pulse, the pulse output end of Single-chip Controlling unit connects the LED lamp through electronic switch unit, and the Single-chip Controlling unit connects and powered by power supply voltage regulation filtering unit; The Single-chip Controlling unit makes that by the closure of the high frequency variable duty ratio square-wave pulse control electronic switch unit of its generation the LED lamp can be with the square-wave pulse high frequency flicker.

Further, described electronic switch unit is made up of the metal-oxide-semiconductor of triode, connection triode.

Further, described Single-chip Controlling unit is for producing the Single-chip Controlling unit of high frequency variable duty ratio square-wave pulse.

LED control device provided by the invention, utilize single-chip microcomputer to produce the high speed square-wave pulse and come the driving LED lamp, make LED lamp energy high frequency flicker, thereby make the LED lamp that the time of rest be arranged, needn't be operated in normal bright state, prolong the useful life of LED lamp, and because human eye has visual persistence effect, so the LED lamp of high frequency flicker is normal bright state in human eye, can not influence its normal use.

Description of drawings

Fig. 1 is the operation principle block diagram of embodiment of the invention LED control device;

Fig. 2 is the circuit diagram of embodiment of the invention LED control device.

Embodiment

Below in conjunction with description of drawings embodiments of the invention are described in further detail, but present embodiment is not limited to the present invention, every employing analog structure of the present invention and similar variation thereof all should be listed protection scope of the present invention in.

As shown in Figure 1, a kind of LED control device provided by the invention, comprise power supply voltage regulation filtering unit and LED lamp, it is characterized in that: comprise that also one can produce the Single-chip Controlling unit of high frequency duty ratio variable square-wave pulse, the pulse output end of Single-chip Controlling unit connects the LED lamp through electronic switch unit, and the Single-chip Controlling unit connects and powered by power supply voltage regulation filtering unit; The Single-chip Controlling unit is by the closure of the high frequency duty ratio variable square-wave pulse control electronic switch unit of its generation, make that the LED lamp can be with the square-wave pulse high frequency flicker, because human eye has visual persistence effect, so the LED lamp of high frequency flicker is normal bright state in human eye.

As shown in Figure 2; power supply inserts voltage stabilizing chip U1 after the filter circuit filtering that short-circuit protection F1, reverse connecting protection diode D1 and capacitor C 1, C2 form; behind the filter circuit secondary filtering that U1 voltage stabilizing and capacitor C 3, C4 form, form the voltage regulation filtering unit again and provide stabilized power supply to single-chip microcomputer U2; the square-wave pulse that single-chip microcomputer U2 produces connects the base stage of triode Q1 after resistance R 2; Q1 grounded collector; emitter connects the grid of metal-oxide-semiconductor Q2, the source ground of Q2, and drain electrode meets LED.

Electronic switch (circuit) unit that single-chip microcomputer U2 is made up of triode Q1, metal-oxide-semiconductor Q2 and resistance R 1 by the base stage control of Q1.

When the square-wave pulse of single-chip microcomputer U2 generation was in high level, triode Q1 conducting made the grid of metal-oxide-semiconductor Q2 be in low level, makes Q2 end, thereby makes LED extinguish.

When the square-wave pulse that produces as single-chip microcomputer U2 was in low level, triode Q1 ended, and makes the grid of metal-oxide-semiconductor Q2 be in high level, made the Q2 conducting, thereby made LED light.

Claims

1, a kind of LED control device, comprise power supply voltage regulation filtering unit and LED lamp, it is characterized in that: comprise that also one can produce the Single-chip Controlling unit of high-frequency impulse, the pulse output end of Single-chip Controlling unit connects the LED lamp through electronic switch unit, and the Single-chip Controlling unit connects and powered by power supply voltage regulation filtering unit.

2, LED control device according to claim 1 is characterized in that, described electronic switch unit is made up of the metal-oxide-semiconductor of triode, connection triode.

3, LED control device according to claim 1 is characterized in that, described Single-chip Controlling unit is for producing the Single-chip Controlling unit of high frequency variable duty ratio square-wave pulse.