US 9,814,112 B2
Load control device for a light-emitting diode light source
Timothy P. Gredler, Center Valley, PA (US); and Matthew R. Zartman, Bethlehem, PA (US)
Assigned to Lutron Electronics Co., Inc., Coopersburg, PA (US)
Filed by Lutron Electronics Co., Inc., Coopersburg, PA (US)
Filed on Mar. 16, 2017, as Appl. No. 15/460,973.
Application 15/460,973 is a continuation of application No. 15/291,308, filed on Oct. 12, 2016, granted, now 9,635,726.
Application 15/291,308 is a continuation of application No. 14/796,278, filed on Jul. 10, 2015, granted, now 9,497,817, issued on Nov. 15, 2016.
Application 14/796,278 is a continuation of application No. 14/290,584, filed on May 29, 2014, granted, now 9,113,521, issued on Aug. 8, 2015.
Claims priority of provisional application 61/828,337, filed on May 29, 2013.
Prior Publication US 2017/0188430 A1, Jun. 29, 2017
Int. Cl. H05B 37/02 (2006.01); H05B 33/08 (2006.01)
CPC H05B 33/0845 (2013.01) [H05B 33/089 (2013.01); H05B 33/0812 (2013.01); H05B 33/0815 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A load control device for controlling an intensity of a lighting load, the load control device comprising:
a load regulation circuit configured to control a magnitude of a load current conducted through the lighting load, the load regulation circuit including a regulation transistor adapted to be coupled in series with the lighting load; and
a control circuit operatively coupled to the regulation transistor of the load regulation circuit for adjusting the magnitude of the load current to control the intensity of the lighting load to a target intensity, the control circuit configured to generate a control signal for rendering the regulation transistor conductive and non-conductive;
wherein the control circuit is configured to control the intensity of the lighting load by maintaining a frequency of the control signal constant and adjusting an on time of the control signal when the target intensity is above a predetermined threshold, and adjusting the frequency of the control signal when the target intensity is below the predetermined threshold.