Led decorative light string

• US 7,293,896 B2
• Filed: 01/13/2006
• Issued: 11/13/2007
• Est. Priority Date: 01/14/2005
• Status: Expired due to Fees

• Current Assignee: Optosupply Electronics (Shenzhen) Limited
• Original Assignee: Optosupply Electronics (Shenzhen) Limited
• Inventors: Cheung, Tung Fong
• Primary Examiner(s): Sember; Thomas M.
• Assistant Examiner(s): BANNAN, JULIE A
• Application Number:
  US11/306,877
• Publication Number:
  US 20060198143A1
• Time in Patent Office: 669 Days
• Field of Search: 362/252, 362/806, 362/231, 315185 R-185 S
• US Class Current: 362/612
• CPC Class Codes: F21S 4/10 with light sources attached to loose electric cables, e.g. Christmas tree lights
• CPC Class Codes: F21V 23/0407 for flashing
• CPC Class Codes: F21W 2121/04 for Christmas trees
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H05B 45/00 Circuit arrangements for operating light-emitting diodes [LED]
• CPC Class Codes: H05B 45/10 Controlling the intensity of the light
• CPC Class Codes: H05B 45/42 Antiparallel configurations

Abstract

The present invention provides a LED decorative light string that comprises one or more branch circuits, each of said more branch circuits is connected in parallel with each other, and then connected to a common power supply wire for importing operational voltage; each said branch circuit comprises a quantity of light groups, and said quantity of light groups are serially connected in turn; each said light group comprises two or more LEDs, wherein at least one LED is connected in parallel with other LEDs in reverse direction, said other LEDs are connected in parallel in the same direction. The LED decorative light string of the present invention has the advantage of more economical, more reliable in performance, longer life span.

Claims

1. A LED decorative light string, comprising:

one or more branch circuits, each said branch circuits being connected in parallel then connected to a common power supply wire for importing operational voltage;

said branch circuit comprising a quantity of light groups that are connected in series;

said light group comprising two or more LEDs, at least one of said LEDs being connected in parallel with other said LEDs in reverse direction, other said LEDs being connected in parallel in the same direction;

two flicker control circuits being connected with said power supply wire;

one end of the first flicker control circuit being connected with said power supply wire, and the other end of the first flicker control circuit being connected with said one or more branch circuits via a positive direction diode,

one end of the second flicker control circuit being connected with said power supply wire, the other end of the second flicker control circuit is connected with said one or more branch circuits via a reverse direction diode.

2. The LED decorative light string according to claim 1, wherein a current limiting resistor is serially connected in said branch circuit for limiting current.

3. The LED decorative light string according to claim 1, wherein each said light group comprises even numbers of said LEDs, half of said LEDs are connected in parallel, and the other half are connected in parallel in reverse direction.

4. The LED decorative light string according to claim 3, wherein each said branch circuit comprises 10 to 100 said light groups connected in series and comprises two said LEDs, connected in parallel in reverse direction.

5. The LED decorative light string according to claim 3, wherein two said LEDs in said light group are two light emitting diode chips integrated into a same housing.

6. The LED decorative light string according to claim 3, wherein two said LEDs in said light groups are two LEDs having two kinds of color.

7. The LED decorative light string according to claim 4, wherein two said light emitting diode chips have two different colors.

8. The LED decorative light string according to claim 1, wherein said branch circuit is arranged one by one along a same direction;

said light group is arranged one by one along the same direction within said branch circuit;

said LED is arranged one by one along the same direction within said light group, thereby, the connection of said LEDs appears one by one continually.

9. The LED decorative light string according to claim 8, wherein said LEDs and connecting wires thereof are installed into a transparent pipe.