LIGHTING DEVICE WITH ADJUSTABLE COLOR TEMPERATURE

• US 20120119665A1
• Filed: 09/02/2011
• Published: 05/17/2012
• Est. Priority Date: 11/15/2010
• Status: Active Grant

• Current Assignee: Advanced Optoelectronic Technology, Inc.
• Original Assignee: Advanced Optoelectronic Technology, Inc.
• Inventors: KUO, TE-WEN
• Granted Patent: US 8,816,590 B2
• Time in Patent Office: Days
• US Class Current: 315/192
• CPC Class Codes: H05B 45/20 Controlling the colour of the light

Abstract

A lighting device with adjustable color temperature includes a power, a driver, and a plurality of branches. The power is electrically connected to the driver for supplying power to the driver. Each of the branches includes a light source and an adjustor connected in series. The adjustor controls the color temperature of the light source in a corresponding branch by adjusting the voltage through the corresponding branch.

Claims

1. A lighting device with adjustable color temperature comprising:

a power, a driver, and a plurality of branches, the power electrically connecting to the drive, the driver respectively connecting to each of the branches, the branches connecting with each other in parallel, wherein each of the branches includes a light source and an adjustor connected in series, the adjustor adjusts a brightness of the light source by controlling a voltage of each of the branches, and the color temperatures of the light sources of at least two of the branches are different.

2. The lighting device with adjustable color temperature of claim 1, wherein the light source is an LED.

3. The lighting device with adjustable color temperature of claim 2, wherein the LED includes at least one LED chip.

4. The lighting device with adjustable color temperature of claim 3, wherein the LED comprises a plurality of LED chips connecting mutually in series or in parallel.

5. The lighting device with adjustable color temperature of claim 3, wherein the number of the branches is two, and the branches are respectively a first branch and a second branch.

6. The lighting device with adjustable color temperature of claim 5, wherein a color temperature of the light source of the first branch is higher than 4000 K, and a color temperature of the light source of the second branch is lower than 4000 K.

7. The lighting device with adjustable color temperature of claim 6, wherein the color temperature of the light source of the first branch is 6000 K, and the color temperature of the light source of the second branch is 2000 K.