METHOD AND APPARATUS FOR DETECTING DIMMER PHASE ANGLE AND SELECTIVELY DETERMINING UNIVERSAL INPUT VOLTAGE FOR SOLID STATE LIGHTING FIXTURES

摘要

A device for detecting a dimmer phase angle set by operation of a dimmer for a solid state lighting load includes a processor having a digital input, a first diode connected between the digital input and a voltage source and a second diode connected between the digital input and ground. The device further includes a first capacitor connected between the digital input and a detection node, a second capacitor connected between the detection node and ground, and a resistance connected between the detection node and a rectified voltage node, which receives a rectified voltage from the dimmer. The processor is configured to sample digital pulses at the digital input based on the rectified voltage and to identify the dimmer phase angle based on lengths of the sampled digital pulses.