US 12,069,784 B2
Load control device for a light-emitting diode light source
Venkatesh Chitta, Center Valley, PA (US); Jeffrey S. Hayes, Allentown, PA (US); and Robert D. Stevens, Jr., Emmaus, PA (US)
Assigned to Lutron Technology Company LLC, Coopersburg, PA (US)
Filed by Lutron Technology Company LLC, Coopersburg, PA (US)
Filed on Jun. 6, 2023, as Appl. No. 18/329,859.
Application 18/329,859 is a continuation of application No. 17/728,609, filed on Apr. 25, 2022, granted, now 11,711,875.
Application 17/728,609 is a continuation of application No. 17/216,378, filed on Mar. 29, 2021, granted, now 11,317,491, issued on Apr. 26, 2022.
Application 17/216,378 is a continuation of application No. 16/870,646, filed on May 8, 2020, granted, now 10,966,299, issued on Mar. 30, 2021.
Application 16/870,646 is a continuation of application No. 16/510,028, filed on Jul. 12, 2019, granted, now 10,652,980, issued on May 12, 2020.
Application 16/510,028 is a continuation of application No. 16/179,774, filed on Nov. 2, 2018, granted, now 10,375,781, issued on Aug. 6, 2019.
Application 16/179,774 is a continuation of application No. 15/864,662, filed on Jan. 8, 2018, granted, now 10,136,484, issued on Nov. 20, 2018.
Application 15/864,662 is a continuation of application No. 15/355,230, filed on Nov. 18, 2016, granted, now 9,888,535, issued on Feb. 6, 2018.
Application 15/355,230 is a continuation of application No. 14/974,853, filed on Dec. 18, 2015, granted, now 9,538,600, issued on Jan. 3, 2017.
Application 14/974,853 is a continuation of application No. 14/536,491, filed on Nov. 7, 2014, granted, now 9,247,608, issued on Jan. 26, 2016.
Claims priority of provisional application 62/032,229, filed on Aug. 1, 2014.
Claims priority of provisional application 61/901,480, filed on Nov. 8, 2013.
Prior Publication US 2023/0319962 A1, Oct. 5, 2023
Int. Cl. H05B 45/38 (2020.01); H02M 1/00 (2007.01); H02M 1/08 (2006.01); H02M 3/00 (2006.01); H02M 3/335 (2006.01); H05B 44/00 (2022.01); H05B 45/10 (2020.01); H05B 45/327 (2020.01); H05B 45/345 (2020.01); H05B 45/37 (2020.01); H05B 45/3725 (2020.01); H05B 45/375 (2020.01); H05B 45/385 (2020.01); H05B 45/39 (2020.01); H05B 45/395 (2020.01); H05B 45/50 (2022.01)
CPC H05B 45/38 (2020.01) [H02M 1/08 (2013.01); H02M 3/33507 (2013.01); H02M 3/33569 (2013.01); H02M 3/33571 (2021.05); H05B 44/00 (2022.01); H05B 45/10 (2020.01); H05B 45/327 (2020.01); H05B 45/345 (2020.01); H05B 45/37 (2020.01); H05B 45/385 (2020.01); H05B 45/39 (2020.01); H05B 45/395 (2020.01); H05B 45/50 (2020.01); H02M 1/0009 (2021.05); H02M 1/0035 (2021.05); H02M 1/0058 (2021.05); H02M 3/01 (2021.05); H05B 45/3725 (2020.01); H05B 45/375 (2020.01); Y02B 70/10 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A lighting load controller, comprising:
control circuitry to:
determine target load current based on a received target intensity;
determine whether target load current is between a maximum load current (IMAX) and a minimum load current (IMIN) or below the minimum load current;
responsive to the determination that target load current falls below IMIN, generate a first output to cause lighting load drive circuitry to:
maintain a load current supplied to a lighting load at the minimum load current IMIN; and
operate at a variable duty cycle;
wherein the variable duty cycle alternates between an ACTIVE state that supplies the minimum load current IMIN to the lighting load and an INACTIVE state that interrupts the minimum load current to the lighting load to provide an average load current less than the minimum load current IMIN to the lighting load; and
responsive to the determination that the target load current falls between IMAX and IMIN, generate a second output to cause the lighting load driver circuitry to:
set the drive current between IMIN and IMAX to provide the determined target load current to the lighting load; and
operate with a fixed duty cycle.