CN2794101Y

CN2794101Y - Light adjuster of LED desk lamp

Info

Publication number: CN2794101Y
Application number: CN 200520071239
Authority: CN
Inventors: 黄鸣涛
Original assignee: Individual
Current assignee: Individual
Priority date: 2005-04-29
Filing date: 2005-04-29
Publication date: 2006-07-05
Anticipated expiration: 2015-04-29

Abstract

The utility model relates to a light adjuster of an LED desk lamp, which mainly comprises a single chip computer U1, a luminance enlarging switch S1, a luminance reducing switch S2, a transistor Q1, an LED lamp, resistors R1 and R2, and a low-voltage dc power supply. The luminance adjustment of the LED lamp depends on the pressing time of the switch S1 or S2. The utility model can be used for starting large-power LED lamps in a low-voltage dc state, and has the advantages of no flicker, little power consumption, long service life, no temperature rise, simple structure, convenient operation, good light adjustment effect, etc. The utility model can be particularly used as a light adjuster for LED desk lamps.

Description

The light modulating device of LED desk lamp

Technical field

The utility model relates to a kind of desk lamp light modulating device, and particularly a kind of LED desk lamp is called for short the light modulating device of LED lamp stand.

Background technology

The luminous component of existing desk lamp is generally incandescent lamp or fluorescent lamp, incandescent lamp is a thermal light source, luminous efficiency is low, fluorescent lamp is about 5000 hours than luminous efficiency height, the life-span of incandescent lamp, must with electric ballast or Inductive ballast is supporting could work, its dimming mode mainly contains controllable silicon light modulation and electric resistance partial pressure light modulation, dual mode is all adjusted the size realization light modulation that potentiometer is adjustable resistance by knob, this mechanical type adjustable resistance damages easily, and the electric resistance partial pressure type light modulation has consumed electric energy because of divider resistance, so though can light modulation not economize on electricity.Because high-brightness LED is now succeeded in developing, its luminous efficiency and fluorescent lamp are suitable, and the life-span is that 20 double-lengths of fluorescent lamp reach 100,000 hours, adopt low voltage power supply, can replace fluorescent-lamp-use in desk lamp or room lighting fully, but still useless light modulating device in the LED desk lamp is supporting with it at present.

Summary of the invention

The purpose of this utility model is the weak point that overcomes above-mentioned controllable silicon light modulation and electric resistance partial pressure light modulation, designs a kind of light modulating device that is exclusively used in the LED desk lamp.

The light modulating device of LED desk lamp of the present utility model, mainly comprise single-chip microcomputer U1, brightness increases switch S 1, brightness reduces switch S 2, triode Q1, the LED lamp, resistance R 1 and R2 and low-voltage dc power supply, the 1st pin of described single-chip microcomputer U1 connects positive source, the 8th pin connects power cathode, the 7th pin connecting resistance R1, the 2nd pin connects the moving contact that brightness increases switch S 1, the 3rd pin connects the moving contact that brightness reduces switch S 2, the normally opened contact of switch S 1 and the normally opened contact of S2 connect positive source, the normally-closed contact of switch S 1 and the normally-closed contact of S2 connect power cathode, the base stage of another termination triode Q1 of resistance R 1, the emitter of triode Q1 connects power cathode, triode Q1 collector electrode connects LED lamp negative pole, and LED lamp positive pole connects positive source through resistance R 2.

In order to be convenient to observe when the light modulation, brightness be can set up and indicating circuit and brightness reduction indicating circuit increased, described brightness increases indicating circuit and comprises switch S 3, indicator light D1 and resistance R 3, the moving contact of switch S 3 connects power cathode, the normally opened contact of switch S 3 connects positive source through indicator light D1 and resistance R 3, described brightness reduces indicating circuit and comprises switch S 4, indicator light D2 and resistance R 4, the moving contact of switch S 4 connects power cathode, the normally opened contact of switch S 4 connects positive source through indicator light D2 and resistance R 4, described switch S 3 and switch S 1 interlock, switch S 4 and switch S 2 interlocks.

The light modulating device of LED desk lamp of the present utility model has advantages such as simple in structure, easy to use, good dimming effect and long service life, is particularly suitable for installing and using on the LED desk lamp.

Description of drawings

Accompanying drawing 1 is a kind of light modulating device of the present utility model;

Accompanying drawing 2 is another kind of light modulating devices of the present utility model;

Accompanying drawing 3 is this light modulating device workflow graphs of a relation.

Embodiment

Referring to accompanying drawing 1, the light modulating device of this LED desk lamp, comprise that mainly single-chip microcomputer U1, brightness increase switch S 1, brightness reduces switch S 2, triode Q1, large-power light-emitting diodes LED, resistance R 1 and R2 and low-voltage dc power supply, low-voltage dc power supply can be selected the 5V/20W Switching Power Supply for use, U1 selects PIC12C508 or PIC12C509 type single-chip microcomputer for use, and described LED lamp is that one or more are by the one group of large-power light-emitting diodes that combines with coloured light or different color light.Its circuit connecting relation as previously mentioned.In order to be convenient to observe when the light modulation, can set up and comprise that the brightness that switch S 3, indicator light D1 and resistance R 3 are formed increases indicating circuit and comprises that the brightness that switch S 4, indicator light D2 and resistance R 4 are formed reduces indicating circuit, referring to accompanying drawing 2, indicator light D1 and D2 select common low power LED for use, and its circuit connecting relation as previously mentioned.In design during Single Chip Microcomputer (SCM) program, the pulse duration of the 7th pin is located on the median, make the electric current of LED lamp be in medium numerical value---be that the LED lamp is in intermediate light; When pressing switch S 1, along with the prolongation of button time, the pulse duration of the 7th pin rises to maximum gradually, makes the LED lamp be in high-high brightness; When pressing switch S 3, along with the prolongation of button time, the pulse duration of the 7th pin is reduced to minimum gradually, makes the LED lamp be in the darkest brightness.So the brightness regulation of LED lamp depends on the time length to the button of switch S1 or S2, its workflow relation is referring to shown in the accompanying drawing 3, and energized is represented in " beginning " among the figure, " end " expression power cutoff.Because PIC12C508 or PIC12C509 type single-chip microcomputer are one and have only 33 reduced instruction set computers, the procedure stores time can reach 40 years, have low-power consumption high-speed cmos technology, wide operating voltage range has only 8 single-chip microcomputers of high-performance of 8 pins, be used for low-voltage direct and light high-powered LED lamp, has no stroboscopic, little power consumption, long-life, advantages such as no temperature rise and simple in structure, easy to use, good dimming effect are particularly suitable for doing light modulating device and use on the LED desk lamp.

Claims

1, a kind of light modulating device of LED desk lamp, it is characterized in that comprising single-chip microcomputer U1, brightness increases switch S 1, brightness reduces switch S 2, triode Q1, the LED lamp, resistance R 1 and R2 and low-voltage dc power supply, the 1st pin of described single-chip microcomputer U1 connects positive source, the 8th pin connects power cathode, the 7th pin connecting resistance R1, the 2nd pin connects the moving contact that brightness increases switch S 1, the 3rd pin connects the moving contact that brightness reduces switch S 2, the normally opened contact of switch S 1 and the normally opened contact of S2 connect positive source, the normally-closed contact of switch S 1 and the normally-closed contact of S2 connect power cathode, the base stage of another termination triode Q1 of resistance R 1, the emitter of triode Q1 connects power cathode, triode Q1 collector electrode connects LED lamp negative pole, and LED lamp positive pole connects positive source through resistance R 2.

2, the light modulating device of LED desk lamp as claimed in claim 1, it is characterized in that also comprising that brightness increases indicating circuit and brightness reduces indicating circuit, described brightness increases indicating circuit and comprises switch S 3, indicator light D1 and resistance R 3, the moving contact of switch S 3 connects power cathode, the normally opened contact of switch S 3 connects positive source through indicator light D1 and resistance R 3, described brightness reduces indicating circuit and comprises switch S 4, indicator light D2 and resistance R 4, the moving contact of switch S 4 connects power cathode, the normally opened contact of switch S 4 connects positive source through indicator light D2 and resistance R 4, described switch S 3 and switch S 1 interlock, switch S 4 and switch S 2 interlocks.

3, the light modulating device of LED desk lamp as claimed in claim 1 or 2 is characterized in that described LED lamp is that one or more are by the one group of large-power light-emitting diodes that combines with coloured light or different color light.