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Color-temperature-adjustable LED driving circuit

A technology of LED drive and color temperature, which is applied in the direction of electric lamp circuit layout, electric light source, light source, etc., can solve the problems of unable to change color temperature, eye fatigue, low work efficiency, etc.

Inactive Publication Date: 2017-01-04
OCEANKING DONGGUAN LIGHTING TECH +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And the color temperature of the lamp is fixed after installation, that is, the color temperature cannot be changed
However, it is easy to cause eye fatigue and low work efficiency when people stay in the cold white temperature environment for a long time.

Method used

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Examples

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Embodiment Construction

[0024] Such as figure 1 Shown is the module diagram of the adjustable temperature LED drive circuit.

[0025] A color temperature adjustable LED driving circuit for adjusting the color temperature of the LED lamp group, including an oscillation module 101, a PWM (Pulse Width Modulation, pulse width modulation) control module 102, a reverse comparison module 103, and a first driver Module 104 and the second driving module 105.

[0026] The oscillation module 101 is used to generate an oscillating triangle wave and output to the PWM control module 102; the PWM control module 102 is used to adjust the duty cycle of the output PWM signal according to the oscillating triangle wave; the first driving module 104 and The reverse comparison module 104 is used to receive the PWM signal output by the PWM control module 102; the reverse comparison module 103 is used to perform reverse processing on the PWM signal, so that the processed PWM signal is compared with all the PWM signals. The duty...

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Abstract

The present invention relates to a color-temperature-adjustable LED driving circuit. Firstly, oscillation triangle waves are generated through an oscillation module, and the duty cycle of outputted PWM signals is adjusted by a PWM control module according to the oscillation triangle waves. After a first driving module and an inverse comparison module receive the PWM signals, the signals are subjected to reverse treatment by the inverse comparison module. After that, the processed PWM signals are outputted to a second driving module. That is to say, the first driving module and the second driving module realize the complementary duty ratio of the PWM signals. Therefore, the light-emitting brightness of a first LED lamp set and the light-emitting brightness of a second LED lamp set, respectively controlled by the first driving module and the second driving module, are complementary in strength. As a result, the light-emitting brightness of the first LED lamp set and the light-emitting brightness of the second LED lamp set are adjusted through changing the duty ratio of the inputted PWM signals. Furthermore, the color temperature of the first LED lamp set and the color temperature of the second LED lamp set are changed.

Description

Technical field [0001] The invention relates to an LED drive circuit, in particular to an LED drive circuit with adjustable temperature that is easy to operate and suitable for various occasions. Background technique [0002] Color temperature is a scale that represents the light color of a light source, and the unit is K (Kelvin). Color temperature has important applications in photography, video, publishing and other fields. The color temperature of the light source is determined by comparing its color with the theoretical thermal blackbody radiator. The Kelvin temperature when the hot black body radiator matches the color of the light source is the color temperature of that light source, and it is directly related to Planck's black body radiation law. The office lighting fixtures currently in use are basically cool and white. And the color temperature is fixed after the lamp is installed, that is, the color temperature cannot be changed. However, people are prone to eye fa...

Claims

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Application Information

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IPC IPC(8): H05B37/02
Inventor 周明杰宋宇宏
Owner OCEANKING DONGGUAN LIGHTING TECH
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