Patent ID: 9485833
Filing Date: 2016-11-01
CPC Classification: H05B

Claim Text:
1. A system for controlling a level of light output by a solid state lighting load controlled by a dimmer, the system comprising: a phase angle detector configured to detect a phase angle of the dimmer based on a rectified voltage from the dimmer and to determine a power control signal based on the detected phase angle and comparison of the detected phase angle with a predetermined first threshold; and a power converter configured to provide an output voltage to the solid state lighting load, the power converter providing the output voltage in response to the rectified voltage from the dimmer in an open loop mode when the detected phase angle is greater than the predetermined first threshold, and providing the output voltage in response to the rectified voltage from the dimmer and the variable power control signal determined by the phase angle detector in a closed loop mode when the detected phase angle is less than the predetermined first threshold.