Modulation method and apparatus for dimming and/or colour mixing utilizing LEDs
First Claim
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1. Apparatus for controlling a set of light emitting diodes (LEDs) comprising:
- at least one current source for powering said set of LEDs; and
at least one controller for controlling said at least one current source via LED control information;
wherein over a portion of a range of dimming intensity levels from 0% to 25%, said LED control information includes individual on times and off times and period for each dimming intensity level, the individual period composed of the sum of on time and off time for the associated dimming intensity level, whereby each individual on time is used to construct a single pulse;
wherein over a portion of the range of dimming intensity levels from 0% to 25%, the individual on and off times, the sum of on time and off time, and period are all variable and not held constant;
wherein over a portion of the range of dimming intensity levels from 0 to 25%, for consecutive dimming intensity levels, the change in desired intensity is less than 3%.
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Abstract
There is provided apparatus for controlling a set of light emitting diodes (LEDs) comprising at least one current source for powering the set of LEDs; a main controller for receiving dimming and/or color mixing information and for translating the information into LED control information and transmitting the LED control information to control the set of LEDs; wherein the LED control information is based on and off times.
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28 Claims
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1. Apparatus for controlling a set of light emitting diodes (LEDs) comprising:
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at least one current source for powering said set of LEDs; and at least one controller for controlling said at least one current source via LED control information; wherein over a portion of a range of dimming intensity levels from 0% to 25%, said LED control information includes individual on times and off times and period for each dimming intensity level, the individual period composed of the sum of on time and off time for the associated dimming intensity level, whereby each individual on time is used to construct a single pulse; wherein over a portion of the range of dimming intensity levels from 0% to 25%, the individual on and off times, the sum of on time and off time, and period are all variable and not held constant; wherein over a portion of the range of dimming intensity levels from 0 to 25%, for consecutive dimming intensity levels, the change in desired intensity is less than 3%. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A method of controlling a set of LEDs comprising the steps of:
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receiving or generating dimming or colour mixing information; translating said dimming or colour mixing information into LED control information based on individual on and off times and period; and transmitting said LED control information to at least one current source for powering said set of LEDs; wherein each individual on time is used to construct a single on pulse; and wherein a ratio of on time to a sum of on and off time corresponds to a dimming intensity level; and wherein over a portion of a range of dimming intensity levels from 0% to 25%, the individual on and off times, the sum of on time and off time, and period are all variable and not held constant; and wherein over a portion of the range of dimming intensity levels from 0 to 25%, for consecutive dimming intensity levels, the change in desired intensity is less than 3%. - View Dependent Claims (26, 27, 28)
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Specification