High-power-factor dimmable LED driver with low-frequency pulse-width modulation

A novel dimmable light-emitting diode (LED) driver is proposed in this study. The circuit topology uses two active switches. One active switch shared by a buck–boost converter and a buck converter is operated at high-switching frequency while the other one is low-frequency pulse-width modulated to d...

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Bibliographic Details
Published in:IET power electronics 2016-08, Vol.9 (10), p.2139-2146
Main Authors: Cheng, Hung-Liang, Chang, Yong-Nong, Cheng, Chun-An, Chang, Chien-Hsuan, Lin, Yu-Hung
Format: Article
Language:English
Subjects:
active switch
Buck converters
buck‐boost converter
circuit topology
Converters
DC‐link voltage regulation
dimmable light emitting diode driver
discontinuous‐conduction mode
driver circuits
Electric potential
harmonic distortion
high‐brightness LED
high‐power‐factor dimmable LED driver
high‐switching frequency
input‐line voltage
Light-emitting diodes
line current
low‐frequency pulse width modulation
Modulation
network topology
power factor correction
power‐conversion process
Pulse duration modulation
PWM power convertors
PWM voltage
Switches
switching convertors
total current harmonic distortion
unity power factor corrector
Voltage
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Summary:A novel dimmable light-emitting diode (LED) driver is proposed in this study. The circuit topology uses two active switches. One active switch shared by a buck–boost converter and a buck converter is operated at high-switching frequency while the other one is low-frequency pulse-width modulated to dim high-power LEDs. The buck–boost converter plays the role of a power-factor corrector. It operates at discontinuous-conduction mode to waveshape the line current to be sinusoidal and in phase with the input-line voltage. The buck converter regulates the dc-link voltage to output a low-frequency pulse-width modulation (PWM) voltage to drive high-brightness LEDs. Since only one power-conversion process is required, and the buck converter works only when the low-frequency PWM voltage is at a high level, the proposed LED driver has the advantage of high efficiency. Besides, it achieves unity power factor and low total current harmonic distortion.
ISSN:1755-4535
1755-4543
1755-4543
DOI:10.1049/iet-pel.2015.0664