公开(公告)号：US20250098048A1

公开(公告)日：2025-03-20

申请号：US18740782

申请日：2024-06-12

Applicant: Delta Electronics, Inc.

Inventor： Ching-Ho Chou ,  Yung-Chuan Lu ,  Tsung-Ta Wu ,  Chien-Ting Lin

IPC: H05B45/325 ,  H05B45/10

Abstract: An LED driver, an LED lighting system and an operating method thereof are provided. The LED driver is for driving an LED light source and includes a strobe circuit and a DC-DC converter. The strobe circuit generates a low-frequency modulation signal. The DC-DC converter is coupled to the strobe circuit and is configured to provide an adjustable operating current to the LED light source according to a DC signal and the low-frequency modulation signal. The operating current includes a DC current signal and a low-frequency AC current signal corresponding to the DC signal and the low-frequency modulation signal respectively. A frequency of the low-frequency AC current signal is between 25 Hz and 100 Hz, and a current ripple factor, equaling a difference of a maximum value and a minimum value of the operating current divided by a sum of the maximum value and the minimum value, is less than 8%.