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US 7,701,151 B2Granted
Lighting control system having temperature compensation and trim circuits
AssigneeAmerican Sterilizer Company
InventorsJames A. Petrucci, Terry A. Drabinski, David A. Hite, Sheari A. Rice
Life of this patent
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Abstract
A lighting control system suitable for a surgical lighting device. The lighting control system includes circuitry that compensates for the effects of temperature changes in a lighting device, and that compensates for forward voltage variations among LED lighting modules to provide substantially uniform light output.
Claims8
A lighting control system for a lighting device, the system comprising:
- a primary controller;
- a plurality of drive controllers electrically connected with the primary controller;
- a plurality of drive outputs electrically connected with a drive controller, each drive controller controlling at least one drive output;
- a plurality of LED modules, each LED module electrically connected with a drive output and having a plurality of LEDs, wherein at least one of said plurality of LED modules includes:
- a temperature compensation circuit to compensate for effects of temperature changes on a forward voltage associated with the LEDs of the LED module, said temperature compensation circuit reducing the forward voltage as the temperature of the LEDs increases.
2 more elements
Dependencies are inferred from the claim text.