US 12,439,488 B2
Field adjustable output for dimmable luminaires
William G. Reed, Seattle, WA (US)
Assigned to EXPRESS IMAGING SYSTEMS, LLC, Renton, WA (US)
Filed by EXPRESS IMAGING SYSTEMS, LLC, Renton, WA (US)
Filed on Dec. 8, 2023, as Appl. No. 18/533,740.
Claims priority of provisional application 63/431,466, filed on Dec. 9, 2022.
Prior Publication US 2024/0196490 A1, Jun. 13, 2024
Int. Cl. H05B 45/10 (2020.01); F21V 23/00 (2015.01); F21V 23/04 (2006.01); F21V 23/06 (2006.01); F21Y 115/10 (2016.01)
CPC H05B 45/10 (2020.01) [F21V 23/008 (2013.01); F21V 23/04 (2013.01); F21V 23/0442 (2013.01); F21V 23/06 (2013.01); F21Y 2115/10 (2016.08)] 22 Claims
OG exemplary drawing
 
1. An apparatus, comprising:
a first resistance source;
a second resistance source electrically coupled in series with the first resistance source, the second resistance source selectively operable to vary a value of resistance provided by the second resistance source;
at least one switch operable to selectively adjust the value of resistance provided by the second resistance source;
a shunt voltage regulator having a reference node, a first node and a second node, the reference node coupled between the first resistance source and the second resistance source to form a voltage divider that provides a reference voltage to the shunt voltage regulator, wherein the shunt voltage regulator is electrically coupled between an LED driver dimming line and a ground via the first and the second nodes of the shunt voltage regulator to regulate a flow of current from the LED driver dimming line based on the reference voltage supplied via the voltage divider.