Method and system for dimming light sources

Details Method and system for dimming light sources Method and system for dimming light sources

H - Electricity

05

B

H05B 33/08 (2006.01) H05B 37/02 (2006.01)

Patent

CA 2534946

Dimming a light source such as a LED over a dimming range (0%-100%) involves adjusting at least one of the intensity (I) and the duty-cycle (DR) of a current flowing through the light source. The dimming range includes at least one portion (L%-H%; 0%-H%) where the light source is fed with a current whose intensity (I) is switched with a given duty cycle (DR) between a non-zero on value and zero, the non-zero on value being a fraction of said rated value (Irated), whereby joint CC and PWM dimming is achieved.

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