US 11,737,191 B2
Semi-closed loop current sense and correction
Michael Archer, Moorpark, CA (US); Louis Chen, Simi Valley, CA (US); and James H. Mohan, Valencia, CA (US)
Assigned to ERP POWER, LLC, Moorpark, CA (US)
Filed by ERP POWER, LLC, Moorpark, CA (US)
Filed on Apr. 11, 2022, as Appl. No. 17/718,155.
Claims priority of provisional application 63/175,994, filed on Apr. 16, 2021.
Prior Publication US 2022/0338323 A1, Oct. 20, 2022
Int. Cl. H05B 45/50 (2022.01); G01R 19/165 (2006.01); H05B 45/14 (2020.01); H05B 45/3725 (2020.01); H05B 45/355 (2020.01)
CPC H05B 45/50 (2020.01) [G01R 19/16571 (2013.01); H05B 45/14 (2020.01); H05B 45/355 (2020.01); H05B 45/3725 (2020.01)] 20 Claims
OG exemplary drawing
 
1. A light driver comprising:
a converter configured to generate a drive current based on a rectified input signal for driving a light source; and
an output correction circuit coupled to an output of the converter and configured to measure the drive current and to generate a correction signal to dynamically control a DC-level of the drive current of the converter based on the drive current and a reference signal corresponding to a desired DC-level of the drive current, the output correction circuit comprising:
a sense resistor in a current path of the drive current and configured to generate a sensed signal corresponding to the drive current;
a signal amplifier coupled to the sense resistor and configured to generate an amplified signal by amplifying the sensed signal; and
a reference generator configured to calculate an average signal based on the amplified signal and to generate an adjusted reference signal based on the amplified signal and the average signal.