System and method for controlling a light emitting diode fixture

• US 9,095,027 B2
• Filed: 11/14/2013
• Issued: 07/28/2015
• Est. Priority Date: 12/21/2007
• Status: Active Grant

• Current Assignee: Google LLC (Alphabet Inc.)
• Original Assignee: Google Inc. (Alphabet Inc.)
• Inventors: Godbole, Kedar, Vargha, Douglas
• Primary Examiner(s): Le, Tung X
• Application Number:
  US14/079,818
• Publication Number:
  US 20140191675A1
• Time in Patent Office: 621 Days
• Field of Search: 315149-159, 315/185.R, 315/209.R, 315/219, 315/224, 315/247, 315/291, 315/294, 315/297, 315/307, 315/308
• US Class Current: 1/1
• CPC Class Codes: H05B 45/10 Controlling the intensity of the light
• CPC Class Codes: H05B 45/31 Phase-control circuits
• CPC Class Codes: H05B 45/357 specially adapted for retrofit LED light sources
• CPC Class Codes: H05B 45/36 Circuits for reducing or suppressing harmonics, ripples or electromagnetic interferences [EMI]
• CPC Class Codes: Y02B 20/30 Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Abstract

A circuit coupled to a light emitting diode (LED) driver circuit is described. The circuit is operative to control functionality of the LED driver circuit based on a firing angle from a power switch.

Claims

1. An apparatus comprising

a light emitting diode (LED) lighting fixture capable of operating according to a plurality of functions controllable based on a plurality of commands;

a circuit coupled to the LED lighting fixture, wherein the circuit is operative to control functionality of the LED lighting fixture by mapping at least one firing angle of a signal received from a power switch to respective commands of the plurality of commands.

2. The apparatus of claim 1, wherein a first pulse of the signal received from the power switch has a first firing angle encoding a first function of the plurality of functions and a second pulse of the signal received from the power switch has a second firing angle encoding a second function of the plurality of functions.

3. The apparatus of claim 2, wherein the first and second functions include at least two of an intensity for the LED lighting fixture, a color for the LED lighting fixture, a power factor for the LED lighting fixture, and a power dissipation of the LED lighting fixture.

4. The apparatus of claim 2, wherein the circuit further comprises a control device operative to identify a type of operation for the LED lighting fixture to perform based on a parameter associated with the first or second firing angle, and to generate a control signal for the LED lighting fixture based on the identified type of operation.

5. The apparatus of claim 4, wherein the control device is operative to utilize a mapping between parameters associated with firing angles and LED lighting fixture operations to identify the type of operation for the LED lighting fixture to perform.

6. The apparatus of claim 2, wherein the signal received from the power switch is an alternating power signal including the first and second pulses.

7. The apparatus of claim 6, wherein the circuit further comprises:

a bridge rectifier operative to generate a non-alternating power signal from the alternating power signal; and

a comparator circuit operative to compare the non-alternating power signal with a reference voltage to generate an output signal, wherein the parameter associated with the firing angle corresponds to a width of a pulse in the output signal.

8. The apparatus of claim 1, wherein the LED lighting fixture comprises a plurality of LEDs coupled in series or in parallel.

9. A method comprising:

determining, by a circuit coupled to a light emitting diode (LED) lighting fixture capable of operating according to a plurality of functions controllable based on a plurality of commands, at least one firing angle of a signal received from a power switch;

mapping the determined at least one firing angle to at least one command of the plurality of commands; and

outputting the at least one command to the LED lighting fixture.

10. The method of claim 9, wherein a first pulse of the signal received from the power switch has a first firing angle encoding a first function of the plurality of functions and a second pulse of the signal received from the power switch has a second firing angle encoding a second function of the plurality of functions.

11. The method of claim 10, wherein the first and second functions include at least two of an intensity for the LED lighting fixture, a color for the LED lighting fixture, a power factor for the LED lighting fixture, and a power dissipation of the LED lighting fixture.

12. The method of claim 10, further comprising identifying, by the circuit, a type of operation for the LED lighting fixture to perform based on a parameter associated with the first or second firing angle to generate a control signal for the LED lighting fixture based on the identified type of operation.

13. The method of claim 12, wherein identifying the type of operation further comprises utilizing, by the circuit, a mapping between parameters associated with firing angles and LED lighting fixture operations to identify the type of operation for the LED lighting fixture to perform.

14. The method of claim 10, wherein the signal received from the power switch is an alternating power signal including the first and second pulses.

15. The method of claim 14, further comprising:

generating, by the circuit, a non-alternating power signal from the alternating power signal; and

comparing, by the circuit, the non-alternating power signal with a reference voltage to generate an output signal, wherein the parameter associated with the firing angle corresponds to a width of a pulse in the output signal.