Phase-cut dimmer device and method of phase-cut dimming for a lighting unit controlled by a rocker-type user interface
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United States of America Patent
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Apr 16, 2019
Grant Date -
Sep 22, 2016
app pub date -
Nov 11, 2013
filing date -
Nov 14, 2012
priority date (Note) -
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Abstract
A device (500) and method (600) control a dimming level of one or more lighting units (130) in response to a user interaction with a reference-free user interface (410), such as a rocker-type interface. A bidirectional triode thyristor (460) supplies an AC input voltage (110) to the lighting unit(s) when it is triggered. A triggering circuit (510) triggers the bidirectional triode thyristor. The triggering circuit includes a capacitor (554) and a variable resistance element (510) which sets a time constant during each half cycle of a period of the AC input voltage for charging the capacitor to a triggering voltage which triggers the bidirectional triode thyristor. The resistance of the variable resistance element is controlled in response to a dimming input signal from the reference-free user interface. The dimming input signal indicates only relative changes in the output level of the lighting unit(s) with respect to the present level.
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