Techniques for color control in dimmable lighting devices and related systems and methods
AssigneeLuminus Devices, Inc.
InventorJinhui Zhai
Life of this patent
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Abstract
Techniques for controlling the color of a light source during dimming are provided. A current control circuit may be arranged within a light source module and configured to adjust, according to a driving input current, the current path that passes through some of the lights (e.g., LEDs) in the module. If multiple current paths that pass through these lights have different impedances, a change in current path will cause the amount of current passing through these lights to increase or decrease. If the adjusted lights have a different color temperature than the other lights of the light source module, the change in current path as the driving current is adjusted can effect a change in color temperature as the light source module is dimmed.
Claims15
A light source module circuit, comprising:
- a plurality of first LEDs connected in series, the first LEDs configured to produce light having first color temperatures;
- one or more control units connected in series with the plurality of first LEDs;
- a plurality of second LEDs connected in series, the second LEDs configured to produce light having second color temperatures, different from the first color temperatures, wherein the plurality of second LEDs is connected in parallel with the plurality of first LEDs and the one or more control units;
- and
- a current control circuit connected in parallel to the one or more control units and configured to, according to a driving current input to the plurality of first LEDs and the plurality of second LEDs, adjust a ratio of current passing through the plurality of first LEDs to current passing through the plurality of second LEDs.
Dependencies are inferred from the claim text.