SOLID STATE LIGHTING APPARATUSES, CIRCUITS, METHODS, AND COMPUTER PROGRAM PRODUCTS PROVIDING TARGETED SPECTRAL POWER DISTRIBUTION OUTPUT USING PULSE WIDTH MODULATION CONTROL
First Claim
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1. A solid state lighting apparatus comprising:
- a variable color input signal configured to indicate a target color of light output from the apparatus; and
a string current Pulse Width Modulation (PWM) controller circuit coupled to the variable color input signal, the string current PWM controller circuit configured to generate a plurality of PWM signals having respective variable duty cycles to enable/disable respective particular string currents for respective variable times as the variable color input signal changes.
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Abstract
A solid state lighting apparatus can include a variable color input signal configured to indicate a target color of light output from the apparatus. A string current Pulse Width Modulation (PWM) controller circuit can be coupled to the variable color input signal, where the string current PWM controller circuit can be configured to generate a plurality of PWM signals having respective variable duty cycles to enable/disable respective particular string currents for respective variable times as the variable color input signal changes.
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Citations
21 Claims
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1. A solid state lighting apparatus comprising:
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a variable color input signal configured to indicate a target color of light output from the apparatus; and a string current Pulse Width Modulation (PWM) controller circuit coupled to the variable color input signal, the string current PWM controller circuit configured to generate a plurality of PWM signals having respective variable duty cycles to enable/disable respective particular string currents for respective variable times as the variable color input signal changes. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A solid state lighting apparatus comprising:
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a plurality of solid state Light Emitting Device (LED) strings, each of the LED strings configured to conduct a respective one of a plurality of particular string currents; a variable color input signal configured to indicate a target color of light output from the apparatus; a variable brightness input signal configured to indicate a target brightness level of the light output from the apparatus; a string current Pulse Width Modulation (PWM) controller circuit including; a color/brightness combiner circuit configured to multiply a level of the variable color input signal with a level of the variable brightness input signal to provide a combined color/brightness input signal; and a plurality of PWM circuits configured to generate a plurality of PWM signals at respective variable duty cycles to enable/disable the respective particular string current for a respective variable time based on a level of the combined color/brightness input signal; and a plurality of string current switching circuits, each configured to receive a respective one of the plurality of PWM signals and configured to enable/disable the respective particular string current to flow through a respective one of the LED strings using the respective variable duty cycle. - View Dependent Claims (16, 17, 18)
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19. A solid state lighting apparatus comprising:
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a plurality of solid state Light Emitting Device (LED) strings, each of the LED strings configured to conduct a respective one of a plurality of particular string currents; a first variable spectral power distribution input signal configured to indicate a first target spectral characteristic of light output from the apparatus; a second variable spectral power distribution input signal configured to indicate a second target spectral characteristic of the light output from the apparatus; and a string current Pulse Width Modulation (PWM) controller circuit coupled to the first and second variable spectral power distribution input signals, the string current PWM controller circuit configured to combine respective levels of the first and second variable spectral power distribution input signals to provide a combined variable spectral power distribution input signal, and configured to generate a plurality of PWM signals having respective variable duty cycles to enable/disable respective particular string currents for respective variable times as a level of the combined variable spectral power distribution input signal changes. - View Dependent Claims (20)
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21-31. -31. (canceled)
Specification