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US 9,520,784 B2Granted
Illumination device control systems and methods
AssigneeCooledge Lighting Inc.
InventorsMichael A. Tischler, William P. Coetzee, Paul Jungwirth
Life of this patent
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Abstract
In various embodiments, a control system for an electronic circuit iteratively applies voltage to and senses current from a load to regulate operation of the load.
Claims35
A lighting system powerable by a primary power source, the lighting system comprising:
- a lighting apparatus (i) comprising one or more light-emitting devices, and (ii) having a non-linear current-voltage relationship;
- and
- a converter for operating the lighting apparatus via application of first and second voltages, the primary power source supplying power to the converter,
- wherein the converter comprises:
- a variable voltage source;
- a sense element;
- and
- a controller configured to:
- (A) apply, via the variable voltage source, the first voltage to the lighting apparatus;
- (B) measure, via the sense element, a first current resulting from the first voltage applied to the lighting apparatus;
- (C) apply, via the variable voltage source, the second voltage to the lighting apparatus;
- (D) measure, via the sense element, a second current resulting from the second voltage applied to the lighting apparatus, a current difference between the second current and the first current having a magnitude;
- (E) set the first current equal to the second current;
- (F) alter the second voltage by a voltage increment based on the magnitude of the current difference;
- and
- (G) repeat steps (C)-(F) during operation of the circuit to regulate operation of the lighting apparatus notwithstanding any changes in the non-linear current-voltage relationship of the lighting apparatus during operation.
13 more elements
Dependencies are inferred from the claim text.