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LED drive circuit with adjustable color temperature

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

Active Publication Date: 2019-02-22
OCEANS KING LIGHTING SCI&TECH CO LTD +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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  • LED drive circuit with adjustable color temperature
  • LED drive circuit with adjustable color temperature

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Embodiment Construction

[0021] like figure 1 Shown is the block diagram of the LED drive circuit with adjustable color temperature.

[0022] An LED drive circuit with adjustable color temperature, used to adjust the color temperature of the LED lamp group, including a voltage adjustment module (not shown in the figure), a voltage divider filter module 101, and a PWM (Pulse Width Modulation, pulse width modulation) control module 102 . The first amplifying module 103 , the first switching module 104 , the second amplifying module 105 and the second switching module 106 .

[0023] The voltage regulation module (not shown) is used to adjust the input voltage, and output the adjusted input voltage to the voltage divider filter module 101; the voltage divider filter module 101 is used to divide the input voltage sequentially , output to the PWM control module 102 after filtering processing; the PWM control module 102 respectively outputs PWM (Pulse Width Modulation, pulse width modulation) signals with c...

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Abstract

In an LED driving circuit with an adjustable color temperature, through a voltage adjusting module, an input voltage size is adjusted; and a voltage-dividing filtering module is used to carry out voltage-dividing filtering processing on an input voltage and then outputs to a PWM control module. A duty ratio of a PWM signal output by the PWM control module is decided by the input voltage size. The PWM control module outputs two paths of complementary PWM signals. And the signals are amplified by a first amplification module and a second amplification module and then are correspondingly output to a first switch module and a second switch module. The duty ratios of the PWM signals received by the first switch module and the second switch module are complementary. Luminescence brightnesses of a first LED lamp group and a second LED lamp group controlled by the first switch module and the second switch module are complementary. Through changing the input voltage size, the luminescence brightnesses of the first LED lamp group and the second LED lamp group can be adjusted and then the color temperatures of the first LED lamp group and the second LED lamp group are changed.

Description

technical field [0001] The invention relates to an LED driving circuit, in particular to an LED driving circuit with adjustable color temperature and easy operation, which is suitable for various occasions. Background technique [0002] Color temperature is a scale that expresses 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 a light source is determined by comparing its color to a theoretical hot black body radiator. The Kelvin temperature at which a hot black body radiator matches the color of a light source is the color temperature of that light source, and is directly related to Planck's black body radiation law. The office lighting fixtures currently used are basically in cool white. Moreover, the color temperature of the lamp is fixed after installation, that is, the color temperature cannot be changed. And people are prone to ey...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B37/02
Inventor 周明杰刘星光
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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