Sectioned network lighting device using full distribution of LED bins

Patent metadata

Field	Value
Publication number	US-9549445-B2
Application number	US-201314068765-A
Country	US
Kind code	B2
Filing date	Oct 31, 2013
Priority date	Oct 31, 2013
Publication date	Jan 17, 2017
Grant date	Jan 17, 2017

Abstract

A driver circuit is configured for connection to a power source and includes a plurality of light emitting diodes (LEDs) having at least one performance characteristic that varies according to different performance categories ranging between higher performance and lower performance. The driver circuit also includes a plurality of LED sections each populated with at least one LED of a different one of the different performance categories. Circuitry is coupled to the LED sections and configured to activate and deactivate the LED sections based on LED performance.

First claim

What is claimed is:

1. A driver circuit configured for connection to a power source, comprising:
a plurality of light emitting diodes (LEDs) having efficiencies that vary according to different efficiency categories ranging between higher efficiency and lower efficiency;
a plurality of LED sections each populated with at least one LED of a different one of the different efficiency categories; and
circuitry coupled to the LED sections and configured to activate and deactivate the LED sections based on LED efficiency.

2. The circuit of claim 1 , wherein the circuitry is configured to activate an LED section with higher efficiency before an LED section with lower efficiency.

3. The circuit of claim 2 , wherein the circuitry is configured to deactivate the LED section with higher efficiency after the LED section with lower efficiency.

4. The circuit of claim 1 , wherein each of the LED sections comprises a plurality of LEDs.

5. The circuit of claim 1 , wherein the LED sections are arranged to establish a series connected ladder network circuit.

6. The circuit of claim 1 , wherein the circuitry comprises a plurality of switches, such that one switch is coupled in parallel with the at least one LED for each LED section other than for a first LED section, and each of the switches is configured to open at a predetermined voltage differing from that for other switches.

7. The circuit of claim 6 , wherein each of the plurality of switches comprises a transistor.

8. The circuit of claim 1 , further comprising a dimmer coupled between the power source and the LED sections.

9. The circuit of claim 8 , wherein the dimmer comprises harmonic dimming electronics.

10. The circuit of claim 8 , wherein the dimmer comprises phase cutting electronics.

11. The circuit of claim 8 , wherein the dimmer is integral to the driver circuit and configured to adjust current among different LED sections to produce a desirable dimming experience with warm color temperature spectral content.

12. The circuit of claim 1 , wherein the circuit is configured to drive the LEDs with a square or stepped waveform.

13. The circuit of claim 1 , wherein the circuit is configured to drive the LEDs with a power factor of at least about 0.95.

14. The circuit of claim 1 , wherein the circuit is configured to facilitate adjustment of current supplied to the LED sections during manufacturing to meet performance targets.

15. A driver circuit configured for connection to a power source, comprising:
a plurality of light emitting diodes (LEDs) having efficiencies that vary according to different efficiency categories ranging between higher efficiency and lower efficiency;
a plurality of LED sections each populated with at least one LED of a different one of the different efficiency categories; and
circuitry coupled to the LED sections and configured to power the LED sections at different duty cycles based on LED efficiency.

16. The circuit of claim 15 , further comprising a dimmer coupled between the power source and the LED sections.

17. A driver circuit configured for connection to a power source, comprising:
a plurality of light emitting diodes (LEDs) having at least one performance characteristic that varies according to different performance categories ranging between higher performance and lower performance;
a plurality of LED sections each populated with at least one LED of a different one of the different performance categories; and
circuitry coupled to the LED sections and configured to activate and deactivate the LED sections based on LED performance.

18. The circuit of claim 17 , wherein the at least one LED performance characteristic comprises color, color temperature or color rendering index.

19. The circuit of claim 17 , wherein:
the plurality of different performance categories comprise between 2 and 12 different performance categories; and
the plurality of LED sections correspond in number to the number of different performance categories.

20. The circuit of claim 17 , wherein the circuitry is configured to power the LED sections at different duty cycles based on LED performance.

21. A method, comprising:
supplying power to a driver circuit comprising a plurality of light emitting diodes (LEDs) that vary in terms of at least one performance characteristic falling into one of a plurality of different performance categories, the driver circuit further comprising a plurality of electrically coupled LED sections each comprising one or more LEDs of only one of the different performance categories;
sequentially activating the LED sections according to a sequence progressing from LED sections with higher performance LEDs to those with lower performance LEDs; and
sequentially deactivating the LED sections according to a sequence progressing from LED sections with lower performance LEDs to those with higher performance LEDs.

22. The method of claim 21 , wherein sequentially activating and deactivating the LED sections comprises:
progressively activating an LED section with higher performance LEDs before one with lower performance LEDs; and
progressively deactivating an LED section with higher performance LEDs after one with lower performance LEDs.

23. A method, comprising:
providing a plurality of light emitting diodes (LEDs) that vary in terms of at least one performance characteristic falling into one of a plurality of different performance categories ranging between higher performance and lower performance;
forming a plurality of electrically coupled LED sections of a light producing device, each of the LED sections configured to controllably power one or more of the LEDs; and
incorporating the one or more LEDs associated with the different performance categories into respective LED sections of the light producing device, such that each LED section comprises one or more LEDs of only one of the different performance categories.

24. The method of claim 21 , further comprising:
characterizing light performance of the light producing device during manufacturing; and
adjusting current supplied to the LED sections to meet performance targets.

Assignees

• 3M Innovative Properties Co

Inventors

• Vos Martin J
• Meis Michael J
• Poch James F

Classifications

• H05B45/20 Primary

  Controlling the colour of the light · CPC title

• H05B33/0857 Primary

  Electricity · mapped topic