Lighting Control System and Method
First Claim
Patent Images
1. A lighting system, comprising:
- first and second light sources each comprising a light emitting diode;
the first light source being operable to generate light having a first color;
the second light source being operable to generate light having a second color;
a signal generator operable to generate a timing signal having a period;
a color control operable to generate a color control signal to adjust a color output of the lighting system;
a controller coupled to the color control to receive the color control signal, and coupled to the first and second light sources;
throughout a first range of the color control signal, the controller being operable to alternately pulse the first and second light sources at high rates such that when the first light source is in one of the one and off states, the second light source is in an opposite one of the one and off states, and being operable to vary the duty cycles of the first and second light sources in a smooth and continuous manner as a function of the color control signal between zero (0) percent and one-hundred (100) percent, where a change in the duty cycle of the first light source is opposite and equal in magnitude to a change in the duty cycle of the second light source;
throughout a second range of the color control signal different than the first range, the controller being operable to illuminate the first light source at a duty cycle of one-hundred (100) percent and to not illuminate the second light source; and
throughout a third range of the color control signal different than the first and second ranges, the controller being operable to illuminate the second light source at a duty cycle one-hundred (100) percent and to not illuminate the first light source.
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Abstract
A lighting system provides for control of the perceived color of the light emitted by the light fixture. The light fixture has two light sources, a control circuit pulses the two light sources and changes relative duty cycles of the light sources to alter a perceived color output of the lighting fixture, in response to a control signal. Duty cycles of the light sources are a function of the control signal.
22 Citations
30 Claims
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1. A lighting system, comprising:
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first and second light sources each comprising a light emitting diode; the first light source being operable to generate light having a first color; the second light source being operable to generate light having a second color; a signal generator operable to generate a timing signal having a period; a color control operable to generate a color control signal to adjust a color output of the lighting system; a controller coupled to the color control to receive the color control signal, and coupled to the first and second light sources; throughout a first range of the color control signal, the controller being operable to alternately pulse the first and second light sources at high rates such that when the first light source is in one of the one and off states, the second light source is in an opposite one of the one and off states, and being operable to vary the duty cycles of the first and second light sources in a smooth and continuous manner as a function of the color control signal between zero (0) percent and one-hundred (100) percent, where a change in the duty cycle of the first light source is opposite and equal in magnitude to a change in the duty cycle of the second light source; throughout a second range of the color control signal different than the first range, the controller being operable to illuminate the first light source at a duty cycle of one-hundred (100) percent and to not illuminate the second light source; and throughout a third range of the color control signal different than the first and second ranges, the controller being operable to illuminate the second light source at a duty cycle one-hundred (100) percent and to not illuminate the first light source. - View Dependent Claims (2, 3, 4, 5)
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6. A lighting system, comprising:
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first and second light sources; a color control operable to generate a color control signal to adjust a color output of the lighting system; a controller coupled to the color control to receive the color control signal, and coupled to the first and second light sources; throughout a first range of the color control signal, the controller being operable to alternately switch the first and second light sources between on and off states such that when the first light source is in one of the one and off states, the second light source is in an opposite one of the one and off states, and being operable to vary the duty cycles of the first and second light sources as a function of the color control signal between zero (0) percent and one-hundred (100) percent, where a change in the duty cycle of the first light source is opposite and equal in magnitude to a change in the duty cycle of the second light source. - View Dependent Claims (7, 8, 9, 10, 11, 12)
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13. A lighting system, comprising:
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first and second light sources, the first light source being operable to generate light having a first color, and the second light source being operable to generate light having a second color; a color control operable to generate a color control signal to adjust a color output of the lighting system; a controller coupled to the color control to receive the color control signal, and coupled to the first and second light sources; throughout a first range of the color control signal, the controller being operable to pulse the first and second light sources at high rates between on and off states, and being operable to smoothly and continuously vary the duty cycles of the first and second light sources as a function of the color control signal where a change in the duty cycle of the first light source is opposite to a change in the duty cycle of the second light source and such that the duty cycle of the first light source varies from a first high duty cycle to a first low duty cycle and the duty cycle of the second light source varies from a second high duty cycle to a second low duty cycle; throughout a second range of the color control signal different than the first range, the controller being operable to illuminate the first light source at the first high duty cycle; and throughout a third range of the color control signal different than the first and second ranges, the controller being operable to illuminate the second light source at the second high duty cycle. - View Dependent Claims (14, 15, 16, 17)
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18. A lighting system, comprising:
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first and second light sources; a signal generator operable to generate a timing signal having a period; a first control operable to generate a control signal to adjust an output of the lighting system; a controller coupled to the first control to receive the control signal, and coupled to the signal generator and the first and second light sources; throughout a first range of the control signal, the controller being operable to pulse the first and second light sources between on and off states and to vary the duty cycle of the first light source as a function of the control signal, between a first high duty cycle and a first low duty cycle; and throughout a second range of the control signal different than the first range, the controller being operable to illuminate the first light source at the first high duty cycle. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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Specification