公开(公告)号：US20240244726A1

公开(公告)日：2024-07-18

申请号：US18236157

申请日：2023-08-21

Applicant: SAMSUNG ELECTRONICS CO., LTD.

Inventor： Bongjin LEE ,  June JANG

IPC: H05B45/325 ,  H05B45/28 ,  H05B45/37 ,  H05B45/395

CPC classification number: H05B45/325 ,  H05B45/28 ,  H05B45/37 ,  H05B45/395

Abstract: A light-emitting diode (LED) control unit includes: 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 the LED driver.

公开(公告)号：US20220167477A1

公开(公告)日：2022-05-26

申请号：US17407826

申请日：2021-08-20

Applicant: SAMSUNG ELECTRONICS CO., LTD.

Inventor： Bongjin LEE ,  June JANG

IPC: H05B45/325 ,  H05B45/10 ,  H05B45/20 ,  H05B45/48 ,  H05B45/46 ,  H05B45/56

Abstract: A light emitting diode (LED) device is provided. The LED device a first LED string configured to emit light having a first color temperature; a second LED string connected to the first LED string in parallel, and configured to emit light having a second color temperature different from the first color temperature; a controller configured to generate a control signal based on a control command received from an external controller; a switching circuit configured to control brightness of any one or any combination of the first LED string and the second LED string based on the control signal; and a power supply configured to generate an internal power voltage for operation of the controller and the switching circuit.