Interference-resistant compensation for illumination devices
First Claim
1. A method for controlling a lamp comprising multiple emission light emitting diode (LED) elements, the method comprising:
- operating one or more of the multiple emission LED elements to produce illumination substantially continuously by supplying a respective drive current at an operative drive current level to each of the one or more of the multiple emission LED elements;
bringing the respective drive current of each of the emission LED elements within the lamp to a non-operative drive current level, which is insufficient to produce illumination, for the duration of each of multiple detection intervals interspersed with periods of said illumination;
monitoring a detection photocurrent induced in a detection interval photodetector within the lamp during at least a portion of each of the multiple detection intervals;
bringing the respective drive current of all except a first one of the emission LED elements within the lamp to a non-operative drive current level which is insufficient to produce illumination, for the duration of a first measurement interval occurring subsequent to the multiple detection intervals and after a period of said illumination, wherein during said first measurement interval, the method comprises;
applying a first drive current at an operative drive current level, which is sufficient to produce illumination, to the first one of the emission LED elements; and
monitoring a measurement photocurrent induced in a first measurement photodetector within the lamp during said applying a first drive current.
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Accused Products
Abstract
A method and illumination device are provided for interference-resistant compensation in light emitting diode (LED) devices. In one embodiment, the method includes monitoring a detection photocurrent within a lamp during multiple detection intervals interspersed with periods of illumination, applying a drive current sufficient to produce illumination to one of multiple emission LED elements within the lamp during a subsequent measurement interval, and monitoring a measurement photocurrent within the lamp while the drive current is applied. An embodiment of an illumination device comprising a lamp includes multiple emission LED elements, one or more photodetectors, and a lamp control circuit, where the lamp control circuit is adapted to perform steps of the method.
260 Citations
22 Claims
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1. A method for controlling a lamp comprising multiple emission light emitting diode (LED) elements, the method comprising:
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operating one or more of the multiple emission LED elements to produce illumination substantially continuously by supplying a respective drive current at an operative drive current level to each of the one or more of the multiple emission LED elements; bringing the respective drive current of each of the emission LED elements within the lamp to a non-operative drive current level, which is insufficient to produce illumination, for the duration of each of multiple detection intervals interspersed with periods of said illumination; monitoring a detection photocurrent induced in a detection interval photodetector within the lamp during at least a portion of each of the multiple detection intervals; bringing the respective drive current of all except a first one of the emission LED elements within the lamp to a non-operative drive current level which is insufficient to produce illumination, for the duration of a first measurement interval occurring subsequent to the multiple detection intervals and after a period of said illumination, wherein during said first measurement interval, the method comprises; applying a first drive current at an operative drive current level, which is sufficient to produce illumination, to the first one of the emission LED elements; and monitoring a measurement photocurrent induced in a first measurement photodetector within the lamp during said applying a first drive current. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An illumination device comprising a lamp, wherein the lamp comprises:
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multiple emission light emitting diode (LED) elements; one or more photodetectors; and a lamp control circuit operably coupled to the multiple emission LED elements and the one or more photodetectors, wherein the lamp control circuit is adapted to; operate one or more of the multiple emission LED elements to produce illumination substantially continuously by supplying a respective drive current at an operative drive current level to each of the one or more of the multiple emission LED elements; bring the respective drive current of each of the emission LED elements to a non-operative drive current level, which is insufficient to produce illumination, for the duration of each of multiple detection intervals interspersed with periods of said illumination; monitor a detection photocurrent induced in a detection interval photodetector of the one or more photodetectors during at least a portion of each of the multiple detection intervals; bring the respective drive current of all except a first one of the emission LED elements to a non-operative drive current level, which is insufficient to produce illumination, for the duration of a first measurement interval occurring subsequent to the multiple detection intervals and after a period of said illumination, wherein during said first measurement interval, the lamp control circuit is further adapted to; apply a first drive current at an operative drive current level, which is sufficient to produce illumination to the first one of the emission LED elements; and while applying the first drive current, monitor a measurement photocurrent induced in a first measurement photodetector of the one or more photodetectors. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification