Honeywell International Inc.

Len De Oto

Brian Barnhart

Richard Policy

Stan Hodge

Don Kulasekera

Methods and systems for monitoring operation of an LED string. An exemplary system includes an LED string, a circuit that supplies current to the LEDs, a current measuring circuit that measures current through the LEDs, a voltage measuring circuit that measures voltage across the LEDs, and a temperature sensor that measures temperature proximate to the LEDs. A processor calculates a predicted string voltage based on a predefined voltage-current curve, number of LEDs, a predefined temperature coefficient value, the measured string current, a measured junction temperature, a life curve function, a prestored calibration string current value, a prestored calibration string voltage value, a prestored junction calibration temperature and an accumulated time value. The process also calculates an error value based on the predicted string voltage and a measured string voltage and generates an indication that there is a failure in the LED string if the calculated error value is greater than the predefined error limit.

Systems and methods for monitoring operation of an LED string

Methods and systems for easily integrating a light-emitting diode (LED) light assembly with an existing xenon power supply. An exemplary system includes a xenon power supply that includes an energy storage device and a device that commands the energy storage device to discharge the stored energy and transmit a trigger signal after a predefined amount of time since at least one of a previous discharge or a beginning of initial charge of the energy storage device. The LED light assembly includes one or more LEDs and a current regulator that receives the discharge from the storage device and regulates current to the LEDs based on LED requirements. The LED light assembly also includes a processing device that receives the trigger signal, resets and begins a timer upon reception of the trigger signal and deactivates the current regulator when the timer has reached predefined threshold.

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Springfield, OH, United States of America

Len De Oto