Universal Lighting Technologies, Inc.

Haiqing (Paul) Yang

Wei Xiong

Stephen D Mays, Ii

Keith Davis

Scott Price

A surge protection device for an LED lighting system provides a failure detection circuit which shuts off an indicator lamp when upon failure of surge protection components. Surge suppression circuits are coupled between respective first and second, and second and third lines for receiving an AC mains input. The surge suppression circuits include a thermal cutoff device and a clamping device, with a fault detection circuit coupled between each respective series circuit. The fault detection circuit activates an indicator lamp when the surge protection device is in a normal operation mode. The fault detection circuit shuts off the indicator lamp when the surge protection device is in a short circuit fault mode, corresponding to failure of at least one component from a surge suppression circuit. Detection of an unlit indicator lamp may serve as a warning to an operator that the associated surge protection device should be replaced.

Failure detection and alerting circuit for a common mode surge protection device in an LED driver

An LED driver circuit capable of being tuned via an unpowered tuning process and associated methods are provided. A radio frequency (RF) coupling circuit receives an RF tuning signal having a plurality of cycles of an RF carrier. The RF coupling circuit outputs a coupled RF tuning signal to a direct current (DC) generator circuit which rectifies the coupled RF tuning signal and outputs a rectified RF tuning voltage. A RF demodulation circuit receives the rectified RF tuning signal and selectively converts each burst of the rectified RF tuning signal to a single DC pulse. The RF demodulation circuit includes a Zener diode limiting the emitted voltage from the RF demodulation circuit. The microcontroller receives the output of the RF demodulation circuit, receives the regulated voltage, and controls one or more tuning operations of the LED driver circuit.

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Madison, AL, United States of America

Haiqing (Paul) Yang