Low voltage decorative light string including power supply

• US 7,029,145 B2
• Filed: 01/31/2003
• Issued: 04/18/2006
• Est. Priority Date: 03/19/2001
• Status: Expired due to Fees

• Current Assignee: Integrated Power Components, Inc.
• Original Assignee: Integrated Power Components, Inc.
• Inventors: Frederick, W. Richard
• Primary Examiner(s): Sember, Thomas M.
• Assistant Examiner(s): Negron, Ismael
• Application Number:
  US10/355,911
• Publication Number:
  US 20030198048A1
• Time in Patent Office: 1,173 Days
• Field of Search: 362/20, 362/227, 362/249, 362/251, 362/252, 362/254, 362806-811, 362/802, 362/234, 362/253, 315/88, 315/90, 315/119, 315/121, 315/125, 315/126, 315/185.R, 315/192, 315/185.S, 315/184
• US Class Current: 362/234
• CPC Class Codes: F21S 4/10 with light sources attached to loose electric cables, e.g. Christmas tree lights
• CPC Class Codes: H05B 39/00 Circuit arrangements or apparatus for operating incandescent light sources structurally associated with the incandescent lamps H01K1/62
• CPC Class Codes: H05B 39/045 with high-frequency bridge converters H05B39/048 takes precedence
• CPC Class Codes: Y02B 20/00 Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps

Abstract

One or more strings of decorative lights are supplied with power by converting a standard residential electrical voltage to a low-voltage, and supplying the low-voltage to at least one pair of parallel conductors having multiple decorative lights connected to the conductors along the lengths thereof, each of the lights, or groups of the lights, being connected in parallel across the conductors. A string of decorative lights comprises a power supply having an input adapted for connection to a standard residential electrical power outlet, the power supply including circuitry for converting the standard residential voltage to a low-voltage output; a pair of conductors connected to the output of the power supply for supplying the low-voltage output to multiple decorative lights; and multiple lights connected to the conductors along the lengths thereof, each of the lights, or groups of the lights, being connected in parallel across the conductors.

Claims

1. A string of decorative lights comprising

a power supply having an input adapted for connection to a standard residential electrical power outlet, said power supply including circuitry for converting the standard residential voltage to a low-voltage and higher frequency output,

a pair of conductors connected to the output of said power supply for supplying said low-voltage output to multiple decorative lights, and

a plurality of lights divided into a plurality of groups of at least two lights, each of said plurality of groups of at least two lights connected to said pair of conductors along the lengths thereof, each of-said plurality of groups of said at least two lights, being connected in parallel across said conductors.

2. A string of decorative lights as set forth in claim 1 wherein each of said lights is about a half-watt bulb.

3. A string of decorative lights as set forth in claim 1 wherein each of said lights requires a voltage or about 6 volts or less.

4. A string of decorative lights as set forth in claim 1 wherein said lights are connected in parallel across said conductors in parallel groups of two to five lights per group, the lights within each group being connected in series.

5. A string of decorative lights as set forth in claim 1 wherein said standard residential voltage is 120 volts and approximately 100 6-volt lights are connected to said conductors.

6. A string of decorative lights as set forth in claim 1 wherein said low-voltage output is less than about 30 volts.

7. A string of decorative lights as set forth in claim 1 wherein said power supply comprises an electronic transformer.

8. A string of decorative lights as set forth in claim 1 wherein said power supply comprises a switching power supply.

9. A string of decorative lights as set forth in claim 1 wherein said higher frequency is in the range from about 10 KHz to about 150 KHz.

10. A string of decorative lights as set forth in claim 1 wherein said conductors are connected to a fixed number of said lights so as to provide a fixed load on said power supply.

11. A string of decorative lights as set forth in claim 1 wherein each of said lights includes means for shunting the light in response to a failure of the light.

12. A string of decorative lights as set forth in claim 1 wherein said higher frequency is pulse width modulated.

13. A string of decorative lights as set forth in claim 1 wherein said power supply includes a dimmer control.

14. A string of decorative lights as set forth in claim 1 wherein said plurality of lights are incandescent lights and said power supply includes a soft-start.

15. A string of decorative lights as set forth in claim 1 which includes a converter for producing a DC output from said high-frequency output.

16. A string of decorative lights as set forth in claim 15 which includes a switch for reversing the current flow in said light string from said DC output to change the decorative effect of said lights.

17. A decorative lighting system, said system comprising

a power supply having an input adapted for connection to a standard residential electrical power outlet, said power supply including circuitry for converting the standard residential voltage to a low-voltage and higher frequency output,

a plurality of pairs of conductors connected to the output of said power supply for supplying said low-voltage output to multiple sets of decorative lights, and

a plurality of lights connected to each pair of said conductors along the lengths thereof, said plurality of lights divided into a plurality of groups of at least two lights, each of said groups of said lights being connected in parallel across each of said pairs of conductors.

18. A decorative lighting system as set forth in claim 17 wherein each of said lights is about a half-watt bulb.

19. A decorative lighting system as set forth in claim 17 wherein each of said lights requires a voltage or about 6 volts or less.

20. A decorative lighting system as set forth in claim 17 wherein each of said pairs of conductors has multiple groups of said lights connected in parallel across the conductor pair, each of said parallel groups including two to five lights connected in series within the group.

21. A decorative lighting system as set forth in claim 17 wherein said standard residential voltage is 120 volts and approximately 100 6-volt lights are connected to each of said pairs of conductors.

22. A decorative lighting system as set forth in claim 17 wherein said low-voltage output is less than about 30 volts.

23. A decorative lighting system as set forth in claim 17 wherein said power supply comprises an electronic transformer.

24. A decorative lighting system as set forth in claim 17 wherein said power supply comprises a switching power supply.

25. A decorative lighting system as set forth in claim 17 wherein said higher frequency is in the range from about 10 KHz to about 150 KHz.

26. A decorative lighting system as set forth in claim 17 wherein each of said pairs of conductors is connected to a fixed number of said lights so as to provide a fixed load on said power supply.

27. A decorative lighting system as set forth in claim 17 wherein each of said lights includes means for shunting the light in response to a failure of the light.

28. A decorative lighting system as set forth in claim 17 wherein said higher frequency is pulse width modulated.

29. A decorative lighting system as set forth in claim 17 wherein said power supply output is variable.

30. A decorative lighting system as set forth in claim 17 wherein said plurality of lights are incandescent lights and said power supply includes a soft-start.

31. A decorative lighting system as set forth in claim 17 which includes a converter for producing a DC output from said high-frequency output.

32. A string of decorative lights as set forth in claim 31 which includes a switch for reversing the current flow in said light string from said DC output to change the decorative effect of said lights.

33. A method of powering a string of decorative lights, said method comprising

converting a standard residential electrical voltage to a low-voltage and a higher frequency, and

supplying said low-voltage to a pair of parallel conductors having multiple decorative lights connected to said conductors along the lengths thereof, the plurality of lights divided into groups of at least two lights, each of said groups of said lights being connected in parallel across said conductors.

34. A method of powering a string of decorative lights as set forth in claim 33 wherein each of said lights is about a half-watt bulb.

35. A method of powering a string of decorative lights as set forth in claim 33 wherein each of said lights requires a voltage or about 6 volts or less.

36. A method of powering a string of decorative lights as set forth in claim 33 wherein said lights are connected in parallel across said conductors in parallel groups of two to five lights per group.

37. A method of powering a string of decorative lights as set forth in claim 33 wherein said standard residential voltage is 120 volts and approximately 100 6-volt lights are connected to said conductors.

38. A method of powering a string of decorative lights as set forth in claim 33 wherein said low-voltage output is less than about 30 volts.

39. A method of powering a string of decorative lights as set forth in claim 33 wherein an electronic transformer is used in the conversion of said standard residential electrical voltage to a low voltage.

40. A method of powering a string of decorative lights as set forth in claim 33 wherein a switching power supply is used in the conversion of said standard residential electrical voltage to a low voltage.

41. A method of powering a string of decorative lights as set forth in claim 33 wherein said higher frequency is in the range from about 10 KHz to about 150 KHz.

42. A method of powering a string of decorative lights as set forth in claim 33 wherein a fixed load is maintained on said conductors by limiting the number of lights connected to said conductors to a fixed number.

43. A method of powering a string of decorative lights as set forth in claim 33 which includes the step of shunting each of said lights in response to a failure of that light.

44. A method of powering a string of decorative lights as set forth in claim 33 wherein said higher frequency is pulse width modulated.

45. A method of powering a string of decorative lights as set forth in claim 33 wherein said conversion of standard residential electrical voltage to a low-voltage includes varying the output voltage.

46. A method of powering a string of decorative lights as set forth in claim 33 wherein said conversion of standard residential electrical voltage to a low-voltage includes soft-starting.

47. A method of powering a string of decorative lights as set forth in claim 33 which includes converting said high-frequency output to DC.

48. A method of powering a string of decorative lights as set forth in claim 47 which includes a switch for reversing the current flow in said light string from said DC output to change the decorative effect of said lights.