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US 8,299,987 B2Granted
Modulation method and apparatus for dimming and/or colour mixing utilizing LEDs
AssigneeLumastream Canada Ulc
InventorsJason Neudorf, Steve Lyons, David Tikkanen
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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.
Claims28
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%.
3 more elements
A method of controlling a set of LEDs comprising the steps of:
- 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%.
8 more elements
Dependencies are inferred from the claim text.