Patent ID: 8115419
Filing Date: 2012-02-14
Classification: H05B,Y02B

Abstract:
1. A lighting control circuit comprising: a dimming level detection circuit configurable to generate a first voltage level signal corresponding to a selected one of at least two different types of dimming signals, the types of dimming signals comprising at least two of an alternating current (AC) phase cut dimming signal, a direct current (DC) voltage level dimming signal or a pulse-width modulated (PWM) dimming signal; a waveform generator configured to output a waveform generator periodic waveform; and a comparator circuit configured to compare the waveform generator periodic waveform with the first voltage level signal to generate a comparator waveform having a comparator duty cycle corresponding to a dimming level of the one of the at least two different input dimming signals and a frequency corresponding to a frequency of the waveform generator periodic waveform.