System and method for non-linear dimming of a light source
AssigneeInfineon Technologies Austria AG
InventorsAndrea Scenini, Andrea Logiudice, Roberto Filippo, Diego Gaetano Munari, Federico Tosato
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Abstract
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.
Claims21
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 N-segment piecewise linear exponential digital control signal, wherein the dimming engine comprises
- an exponential clock generator;
- a dimming counter coupled to an output of the exponential clock generator;
- and
- a 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 an intensity of a light source.
A circuit for producing a piecewise linear exponential control signal with N linear segments, the circuit comprising:
- an increment counter comprising a dimming signal output;
- and
- an exponential clock generator comprising an output coupled to an input of the increment counter, the exponential clock generator configured to change a frequency of the output according to a piecewise linear segment.
A method for producing a piecewise linear exponential control signal, the method comprising:
- generating an exponential clock signal, the exponential clock signal comprising a frequency proportional to a slope of the exponential control signal;
- incrementing a first counter clocked with the exponential clock signal;
- and
- transmitting an output of the first counter.
Dependencies are inferred from the claim text.