US 12,261,521 B2
Load control device having a closed-loop gate drive circuit including overcurrent protection
Brian J. Bollinger, Quakertown, PA (US); Venkatesh Chitta, Center Valley, PA (US); Firozbabu Cholashari, Macungie, PA (US); and Jonathan Waldron, Bethlehem, PA (US)
Assigned to Lutron Technology Company LLC, Coopersburg, PA (US)
Filed by Lutron Technology Company LLC, Coopersburg, PA (US)
Filed on Dec. 20, 2023, as Appl. No. 18/390,105.
Application 18/390,105 is a continuation of application No. 18/089,313, filed on Dec. 27, 2022, granted, now 11,894,764.
Application 18/089,313 is a continuation of application No. 16/875,921, filed on May 15, 2020, granted, now 11,569,733, issued on Jan. 31, 2023.
Claims priority of provisional application 62/849,494, filed on May 17, 2019.
Prior Publication US 2024/0120829 A1, Apr. 11, 2024
Int. Cl. H02M 1/08 (2006.01); H02M 1/32 (2007.01); H02M 7/219 (2006.01); H05B 45/10 (2020.01); H05B 45/37 (2020.01); H05B 47/25 (2020.01)
CPC H02M 1/32 (2013.01) [H02M 1/08 (2013.01); H02M 7/219 (2013.01); H05B 45/10 (2020.01); H05B 45/37 (2020.01); H05B 47/25 (2020.01)] 25 Claims
OG exemplary drawing
 
1. A load control device configured to control power delivered from an AC power source to an electrical load, the load control device comprising:
a controllably conductive device adapted to be coupled in series between the AC power source and the electrical load, the controllably conductive device comprising a semiconductor switch configured to conduct a load current through the electrical load;
a gate drive circuit configured to:
generate a target signal;
receive a first feedback signal indicative of a magnitude of the load current conducted through the semiconductor switch;
receive a second feedback signal indicative of a magnitude of a voltage developed across the semiconductor switch;
shape the target signal during a turn-off period in response to the second feedback signal; and
generate a gate control signal in response to the target signal and the first feedback signal;
wherein the semiconductor switch of the controllably conductive device is configured to be rendered non-conductive in response to the gate control signal.