US 12,177,951 B2
Method and apparatus for power feedback LED voltage control
Eric Li, Danville, CA (US); and Shean-Yih Chiou, Milpitas, CA (US)
Assigned to SCT LTD., Grand Cayman (KY)
Filed by SCT LTD., Grand Cayman (KY)
Filed on Feb. 14, 2023, as Appl. No. 18/169,067.
Claims priority of provisional application 63/310,084, filed on Feb. 14, 2022.
Prior Publication US 2023/0262859 A1, Aug. 17, 2023
Int. Cl. H05B 45/34 (2020.01); H02M 1/00 (2006.01); H03M 1/12 (2006.01)
CPC H05B 45/34 (2020.01) [H02M 1/0025 (2021.05); H03M 1/1245 (2013.01)] 18 Claims
OG exemplary drawing
 
1. An LED system, comprising:
an LED array comprising a plurality of LED subarrays,
a plurality of driver circuits, each connected to and driving one of the plurality of LED subarrays, wherein each of the plurality of driver circuits comprises a comparator circuit for determining, as a local minimum voltage, a lowest voltage in the corresponding LED subarray connected thereto, a local voltage register for storing the local minimum voltage, and a global voltage register for storing, as a global minimum voltage, a lowest voltage among the plurality of local minimum voltages in the plurality of LED subarrays;
a power supply connected to and outputting a voltage to the LED array;
a bus connecting the plurality of driver circuits; and
a feedback circuit connected to the power supply and one or more of the global voltage registers in the plurality of driver circuits, wherein the feedback circuit provides the power supply with a feedback signal reflecting the global minimum voltage and causes the power supply to adjust the voltage output to the LED array.