US 12,471,192 B2
LED control unit, lighting device having the same, and operating method thereof
Bongjin Lee, Suwon-si (KR); and June Jang, Suwon-si (KR)
Assigned to SAMSUNG ELECTRONICS CO., LTD., Suwon-si (KR)
Filed by SAMSUNG ELECTRONICS CO., LTD., Suwon-si (KR)
Filed on Aug. 21, 2023, as Appl. No. 18/236,157.
Claims priority of application No. 10-2023-0004823 (KR), filed on Jan. 12, 2023.
Prior Publication US 2024/0244726 A1, Jul. 18, 2024
Int. Cl. H05B 45/325 (2020.01); H05B 45/20 (2020.01); H05B 45/28 (2020.01); H05B 45/30 (2020.01); H05B 45/37 (2020.01); H05B 45/395 (2020.01)
CPC H05B 45/325 (2020.01) [H05B 45/28 (2020.01); H05B 45/37 (2020.01); H05B 45/395 (2020.01)] 19 Claims
OG exemplary drawing
 
1. A light-emitting diode (LED) control unit comprising:
a pulse generator configured to generate a pulse signal;
a T-filter configured to convert the pulse signal into a triangular wave signal;
a first gate driver configured to receive the triangular wave signal and output a first gate control signal;
a second gate driver configured to receive the first gate control signal and output a second gate control signal;
a first switch configured to turn on a first LED string corresponding to a first color temperature based on the first gate control signal;
a second switch configured to turn on a second LED string corresponding to a second color temperature based on the second gate control signal; and
a power supply circuit configured to supply a power supply voltage to the pulse generator, the first gate driver, and the second gate driver by stepping down an operating voltage of an LED driver.