LED LAMP WITH HIGH EFFICACY AND HIGH COLOR RENDERING AND MANUFACTURING METHOD THEREOF

• US 20100072919A1
• Filed: 02/15/2008
• Published: 03/25/2010
• Est. Priority Date: 02/16/2007
• Status: Active Grant

• Current Assignee: Xiamen Topstar Lighting Company Limited (Xiamen Light Industry Group Corp. Ltd.)
• Original Assignee: Xiamen Topstar Lighting Company Limited (Xiamen Light Industry Group Corp. Ltd.)
• Inventors: Liao, Guochun, Han, Junxiang, Wei, Lan
• Granted Patent: US 8,193,735 B2
• Time in Patent Office: Days
• US Class Current: 315/294
• CPC Class Codes: F21K 9/00 Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H05B 45/20 Controlling the colour of the light
• CPC Class Codes: Y02B 20/30 Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Abstract

A LED lamp and a manufacturing method thereof are disclosed. At least one blue LED chip can be used as an excitation light source. A number of red LED chips are arranged around the blue LED chip. The blue LED chip and red chips are covered with a packaging material with phosphor. The intensity of red light can be adjusted by a control circuit. Thus, the white LED lamps with high efficacy and high color rendering at different color temperatures can be achieved.

Claims

1. A method for obtain LED lamp with high efficacy and high color rendering comprising:

at least one blue LED chip is used as an excitation light source and a number of red LED chips are arranged around the blue LED chip, the intensity of red light is adjusted by a control circuit so that a white LED lamp with different color temperatures is achieved.

2. The method according to claim 1, wherein said a number of red LED chips are around the blue LED chip and electrically connected to the blue chip, phosphor and packaging material are covered on the blue chip and red ships;

said control circuit providing power to the blue LED, and the intensity of the red light is adjusted by the control circuit;

excite the phosphor by the blue light emitted by the blue chip to produce yellow light, the yellow light, the rest blue light of the blue chip except the portion which exciting the phosphor and the red light emitted by the red chip are mixed to be a multicolor light, by the reasonable arrangement of the blue chip and red chip and reasonable design of control circuit, and by adjusting the intensity of the red light, the white LED lamp with different color temperature can be achieved.

3. The method according to claim 1, wherein said blue LED chips and red LED chips are arranged on the pedestal orderly, and the red LED chips are electrically connected to said blue LED chips, all of the chips are covered with phosphor and packaging material, and the intensity of the red light is adjusted by the control circuit.

4. The method according to claim 2, wherein the peak wavelength of said blue LED chip is in the range of 44˜

480 nm, preferably, in the range of 450˜

470 nm;

the peak wavelength of said red LED chip is in the range of 600˜

670 nm, preferably, in the range of 610˜

650 nm;

the peak wavelength of said phosphor is in the range of 520˜

680 nm, preferably, in the range of 540˜

660 nm.

11. The method according to claim 3, wherein the peak wavelength of said blue LED chip is in the range of 440˜

480 nm, preferably, in the range of 450˜

470 nm;

the peak wavelength of said red LED chip is in the range of 600˜

670 nm, preferably, in the range of 610˜

650 nm;

the peak wavelength of said phosphor is in the range of 520˜

580 nm, preferably, in the range of 540˜

660 nm.

5. A LED lamp with high efficacy and high color rendering comprising at least one blue LED chip, a number of red LED chips, phosphor, packaging material and a control circuit, both the blue LED chips and red LED chips are covered with phosphor and packaging material, said control circuit connected to the blue LED chips and red LED chips so as to provide power to the blue LED chips and adjust the intensity of the red LED chips.

6. The LED lamp according to claim 5, wherein said a number of red LED chips are arranged around the blue LED chips.

7. The LED lamp according to claim 5, wherein said blue LED chips and red LED chips are fixed on the pedestal orderly.

8. The LED lamp according to claim 5, wherein the control circuit comprises a power, a driving circuit and an adjustable resistor R;

the red LED chips connected to the adjustable resistor R in series, one end of the red LED chips connected to the power and the other end connected to driving circuit;

the blue LED chips connected to each other in parallel, one end of the blue chip connected to the power, and the other end connected to driving circuit 52 to form an electrical connection, the intensity of the red LED chip is adjust by the control circuit.

9. The LED lamp according to claim 5, wherein the peak wavelength of said blue LED chip is in the range of 440˜

480 nm, preferably, in the range of 450˜

470 nm;

the peak wavelength of said red LED chip is in the range of 600˜

670 nm, preferably, in the range of 610˜

650 nm;

the peak wavelength of said phosphor is in the range of 520˜

680 nm, preferably, in the range of 540˜

660 nm.

10. The LED lamp according to claim 5, wherein the blue LED chip number is one, and the four red LED chips arranged around the blue LED chip, the intensity of the four red LED is adjusted by the control circuit.