LED lighting system

• US 8,791,650 B2
• Filed: 12/10/2011
• Issued: 07/29/2014
• Est. Priority Date: 02/09/2006
• Status: Active Grant

• Current Assignee: LED Smart Inc.
• Original Assignee: LED Smart Inc.
• Inventors: Shan, Xinxin
• Primary Examiner(s): Owens, Douglas W
• Assistant Examiner(s): PHAM, THAI N
• Application Number:
  US13/316,499
• Publication Number:
  US 20120319582A1
• Time in Patent Office: 962 Days
• Field of Search: 315/77, 315/185.S, 315/195, 315/291, 315/294, 315/307, 362/545, 362/800
• US Class Current: 315/294
• CPC Class Codes: F21S 4/28 rigid, e.g. LED bars
• CPC Class Codes: F21V 23/04 the elements being switches safety devices F21V25/00
• CPC Class Codes: F21V 29/507 of means for protecting lighting devices from damage, e.g. housings
• CPC Class Codes: F21Y 2101/00 Point-like light sources
• CPC Class Codes: F21Y 2103/10 comprising a linear array of point-like light-generating elements
• CPC Class Codes: F21Y 2107/30 on the outer surface of cylindrical surfaces, e.g. rod-shaped supports having a circular or a polygonal cross section
• CPC Class Codes: F21Y 2113/13 comprising an assembly of point-like light sources
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H05B 45/10 Controlling the intensity of the light
• CPC Class Codes: H05B 45/305 Frequency-control circuits
• CPC Class Codes: H05B 45/325 Pulse-width modulation [PWM]
• CPC Class Codes: H05B 45/345 Current stabilisation; Maintaining constant current
• CPC Class Codes: H05B 45/3578 Emulating the electrical or functional characteristics of discharge lamps
• CPC Class Codes: H05B 45/3725 Switched mode power supply [SMPS]
• CPC Class Codes: H05B 45/50 responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
• CPC Class Codes: H05B 45/56 involving measures to prevent abnormal temperature of the LEDs
• CPC Class Codes: Y02B 20/30 Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
• CPC Class Codes: Y10S 362/80 Light emitting diode

Abstract

An LED lighting system is provided for connection to a variable power source providing input power, the LED lighting system having at least one power analyzing and processing circuitry connecting to the variable power source, and being configured to identify one or more characteristics of the input power, where the characteristics are selected from amplitude, frequency and pulse width of the input power, compare one or more of the characteristics of the input power to preset control criteria either in hardware or software or both to yield a comparison result, and then control the current control circuitry according to the comparison result.

Claims

1. An LED lighting system for connection to a variable power source providing input power, comprising:

at least one LED array extending along a support structure spanning between a first end and a second end, the support structure made of rigid material, the support structure being sufficiently heat conductive to provide heat dissipation for LEDs in the at least one LED array;

an electrical connector for connection to the variable power source at least at the first end or between the first end and the second end;

power control circuitry for the at least one LED array, the power control circuitry being carried by the support structure and being in electrical communication with the electrical connector;

a circuit board supporting the at least one LED array, the corresponding power control circuitry being provided on the circuit board or on a separate board;

the at least one LED array being divided into sets of LEDs;

the power control circuitry being formed of one or multiple current controllers, each of the one or multiple current controllers providing current control for a corresponding set of LEDs in the LED array; and

at least one power analyzing and processing circuitry connecting to the variable power source and being configured to;

identify one or more characteristics of the input power, where the characteristics are selected from amplitude, frequency, and pulse width of the input power,

compare one or more of the characteristics of the input power to preset control criteria either in hardware or software or both to yield a comparison result, and

control the current control circuitry according to the comparison result.

2. The LED lighting system of claim 1 in which each LED of the at least one LED array has a power rating of no less than 0.01 watts.

3. The LED lighting system of claim 1 further comprising:

the support structure being generally elongated in a first direction;

the at least one LED array having a first illumination field directed perpendicularly to the first direction; and

at least one other LED array carried by the support structure, the at least one other LED array having a second illumination field directed perpendicularly to the first direction, the second illumination field being oriented at a non-zero angle to the first illumination field.

4. The LED lighting system of claim 3 in which first illumination field and the second illumination field are oriented at 180 degrees to each other.

5. The LED lighting system of claim 1 further comprising:

the support structure being generally elongated in a first direction; and

plural other LED arrays carried by the support structure, the plural other LED arrays being oriented to provide an illumination field that extends 360 degrees around the support structure at a given distance outward from the support structure.

6. The LED lighting system claim 1 in which the support structure has a front side on which the at least one LED array is carried and a rear side on which the power control circuitry is carried.

7. The LED lighting system claim 1 further comprising an electrical connector at a second end of the support structure.

8. The LED lighting system of claim 7 in which the electrical connectors at each of the first end and the second end of the support structure are compatible with fluorescent light receptacle attachment pins.

9. The LED lighting system of claim 8 in which the onboard current control circuitry is configured to provide constant current to the LEDs of the at least one LED array.

10. The LED lighting system claim 1 in which the support structure is made of a unitary piece of material that is both heat conductive and rigid.

11. The LED lighting system of claim 1 further comprising an optically transparent or translucent cover secured to the support structure over the at least one LED array.

12. The LED lighting system of claim 1 in which the support structure is hollow.

13. The LED lighting system of claim 1 in which the at least one LED array is provided on a front side of the support structure and the support structure has a domed shaped rear side.

14. The LED lighting system of claim 11 in which the combination of support structure and optically transparent cover has an egg shaped cross-section.

21. The LED lighting system of claim 1 further comprising a variable power source, the variable power source have controllable characteristics, the characteristics being selected from the group comprising voltage amplitude, power frequency, and pulse width.

15. An LED lighting system for connection to a variable power source providing input power, comprising:

a support structure;

an electrical connector for connection to the variable power source;

at least one LED array in the support structure;

power control circuitry for the at least one LED array, the power control circuitry being carried by the support structure and being in electrical communication with the electrical connector;

a circuit board supporting the at least one LED array, the corresponding power control circuitry being provided on the circuit board or on a separate board;

the at least one LED array being divided into sets of LEDs of same or different colors;

the power control circuitry being formed of one or multiple current controllers, each of the one or multiple current controllers providing current control for a corresponding set of LEDs in the LED array; and

at least one power analyzing and processing circuitry connecting to the variable power source, and being configured to;

identify one or more characteristics of the input power, where the characteristics are selected from amplitude, frequency, and pulse width of the input power,

compare one or more of the characteristics of the input power to preset control criteria either in hardware or software or both to yield a comparison result, and

control the current control circuitry providing same or different current control for a corresponding set of LEDs in the at least one LED array according to the comparison result.

16. An LED lighting system comprising:

at least one LED array extending along a support structure spanning between a first end and a second end, wherein the support structure is made of rigid material, the support structure being sufficiently heat conductive to provide heat dissipation for the LEDs in the at least one LED array;

an electrical connector for connection to the power source;

at least one LED array extending along the support structure;

power control circuitry for the at least one LED array, the power control circuitry being carried by the support structure and being in electrical communication with the electrical connector;

at least a circuit board supporting the at least one LED array; and

the power control circuitry including at least a current controller and a feedback circuit, the current controller being connected to receive a feedback signal from the feedback circuit and the current controller being configured to supply a constant average current to the LEDs of the at least one LED array.

17. The LED lighting system of claim 16 in which the at least one LED array is divided into sets of LEDs, the power control circuitry comprising multiple current controllers, each current controller of the multiple current controllers having a corresponding feedback circuit and each current controller of the multiple current controllers providing feedback controlled current control for a corresponding set of LEDs in the LED array.

18. The LED lighting system of claim 16 in which the power control circuitry is shared by multiple sets of LEDs in the at least one LED array.

19. The LED lighting system of claim 16 in which the power control circuitry is provided on a separate board from the at least a circuit board.

20. The LED lighting system of claim 16 in which the power control circuitry is provided on the at least a circuit board.