Interference-resistant compensation for illumination devices having multiple emitter modules
First Claim
1. A method for controlling an illumination device comprising multiple emitter modules, wherein each emitter module comprises multiple emission light emitting diode (LED) elements and one or more photodetectors, the method comprising:
- operating one or more of the multiple emission LED elements in each of the multiple emitter modules 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 currents of all except one of the emission LED elements within a first emitter module of the multiple emitter modules to a non-operative drive current level, which is insufficient to produce illumination, for the duration of a measurement interval within a first series of measurement intervals interspersed with periods of said illumination; and
bringing the respective drive currents of all except one of the emission LED elements within a second emitter module of the multiple emitter modules to a non-operative drive current level, which is insufficient to produce illumination, for the duration of a measurement interval within a second series of measurement intervals interspersed with periods of said illumination, wherein the first series of measurement intervals and the second series of measurement intervals are separated by a respective first offset and second offset from a timing reference.
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Accused Products
Abstract
A method and light emitting diode (LED) illumination device comprising multiple emitter modules are provided. In one embodiment, the method includes bringing to a level insufficient to produce illumination the respective drive currents of all except one of multiple emission LED elements within respective first and second emitter modules for the duration of a measurement interval within respective first and second series of measurement intervals. The measurement intervals are interspersed with periods of illumination, and the first and second series of measurement intervals are separated by respective first and second offsets from a timing reference. An embodiment of an illumination device includes multiple emitter modules, where each emitter module includes multiple emission LED elements and one or more photodetectors. The illumination device further includes a lamp control circuit adapted to perform steps of the method.
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Citations
22 Claims
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1. A method for controlling an illumination device comprising multiple emitter modules, wherein each emitter module comprises multiple emission light emitting diode (LED) elements and one or more photodetectors, the method comprising:
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operating one or more of the multiple emission LED elements in each of the multiple emitter modules 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 currents of all except one of the emission LED elements within a first emitter module of the multiple emitter modules to a non-operative drive current level, which is insufficient to produce illumination, for the duration of a measurement interval within a first series of measurement intervals interspersed with periods of said illumination; and bringing the respective drive currents of all except one of the emission LED elements within a second emitter module of the multiple emitter modules to a non-operative drive current level, which is insufficient to produce illumination, for the duration of a measurement interval within a second series of measurement intervals interspersed with periods of said illumination, wherein the first series of measurement intervals and the second series of measurement intervals are separated by a respective first offset and second offset from a timing reference. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An illumination device comprising:
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multiple emitter modules, wherein each emitter module comprises multiple emission light emitting diode (LED) elements and one or more photodetectors; and a control circuit operably coupled to the multiple emitter modules, wherein the control circuit is adapted to; operate one or more of the multiple emission LED elements within each of the multiple emitter modules 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 currents of all except one of the emission LED elements within a first emitter module of the multiple emitter modules to a non-operative drive current level, which is insufficient to produce illumination, for the duration of a measurement interval within a first series of measurement intervals interspersed with periods of said illumination; and bring the respective drive currents of all except one of the emission LED elements within a second emitter module of the multiple emitter modules to a non-operative drive current level, which is insufficient to produce illumination, for the duration of a measurement interval within a second series of measurement intervals interspersed with periods of said illumination, wherein the first series of measurement intervals and the second series of measurement intervals are separated by a respective first offset and second offset from a timing reference. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification