System and method for non-linear dimming of a light source

摘要

In one embodiment, a light dimming module is disclosed. The light dimming module has a dimming engine coupled to a digital input interface and an output interface. The dimming engine is configured to provide a N-segment piecewise linear exponential digital control signal, and the output interface is configured to control the intensity of a light source.

主权项

1. A light dimming module comprising:
a digital input interface; a dimming engine coupled to the digital input interface, the dimming engine configured to provide a digital control signal having N-segment piecewise linear approximation of an exponential ramp from a starting intensity level to a final intensity level over a predetermined transition time, wherein the digital control signal represents values in a linear scale, wherein the dimming engine comprises:
an exponential clock generator,a dimming counter coupled to an output of the exponential clock generator, anda prescaler coupled to an input of the exponential clock generator; and an output interface coupled to the dimming engine, the output interface configured to control the intensity of a light source.