US 9,814,110 B1
Power factor correction in and dimming of solid state lighting devices
Suresh Hariharan, Livermore, CA (US)
Assigned to Maxim Integrated Products, Inc., San Jose, CA (US)
Filed by Maxim Integrated Products, Inc., San Jose, CA (US)
Filed on Dec. 3, 2013, as Appl. No. 14/95,678.
Application 14/095,678 is a division of application No. 12/547,265, filed on Aug. 25, 2009, granted, now 8,629,629.
Claims priority of provisional application 61/091,715, filed on Aug. 25, 2008.
Claims priority of provisional application 61/161,724, filed on Mar. 19, 2009.
Int. Cl. H05B 33/08 (2006.01)
CPC H05B 33/0845 (2013.01) [H05B 33/0896 (2013.01)] 19 Claims
OG exemplary drawing
 
1. An LED driver circuit for dimming the output intensity of solid state lighting devices, the circuit comprising:
a driver circuit that is compatible with an electronic transformer and configured to couple to a solid state lighting device, the driver circuit controls an input current drawn by the driver circuit to provide a programmed average power output to the solid state lighting device based on the driver input current;
an LC filter coupled between a power source and the driver circuit; and
a switching device coupled to an output of the driver circuit and to the solid state lighting device, the driver circuit controls the switching device by analyzing an output from LC filter relative to an internally provided reference, the driver circuit provides the programmed average power output such that a dimming operation performed on the driver input current causes a power variation within the programmed average power output.