Patent ID: 8203276
Filing Date: 2012-06-19
Classification: H05B,Y10S

Abstract:
1. A phase controlled dimming driver circuitry configured to receive a regulated alternating current (AC) signal from a phase control dimmer and to enable dimming the intensity of light generated by a light source that is connected to said phase controlled dimming driver circuitry, comprising: a) an input stage configured to receive said regulated AC signal and output a rectified direct current (DC) signal; b) a phase decode stage configured to decode a phase of said rectified DC signal, giving rise to the decoded phase, said phase representing a required light dimming level of said light source; c) a pulse width modulation (PWM) generation stage configured to generate a PWM signal to be provided to said light source, said PWM signal having duty cycle set according to said decoded phase; d) a flyback converter stage configured to receive said rectified DC voltage signal from said input stage and to generate a regulated DC voltage on a constant voltage capacitor, which is connected to the output of said flyback converter stage, for enabling maintaining substantially constant voltage on said light source; and e) an output stage configured to receive said PWM signal from said PWM generation stage and to output a corresponding signal to said light source, wherein said corresponding signal is both pulse width modulated and amplitude modulated for enabling dimming the light intensity of said light source, said pulse width modulation applied to said light source at a frequency substantially unrelated to the frequency of said regulated AC signal provided from said phase control dimmer.