DocumentCode :
48756
Title :
Design and Implementation of a High-Power-Factor LED Driver With Zero-Voltage Switching-On Characteristics
Author :
Hung-Liang Cheng ; Cheng-Wei Lin
Author_Institution :
Dept. of Electr. Eng., I-Shou Univ., Kaohsiung, Taiwan
Volume :
29
Issue :
9
fYear :
2014
fDate :
Sept. 2014
Firstpage :
4949
Lastpage :
4958
Abstract :
This paper proposes a novel light-emitting diode (LED) driver consisting of a buck-boost converter and a buck converter. Each converter adopts a power MOSFET as the active switch. With no need to use any auxiliary switches or snubber circuits, both active switches can operate at zero-voltage switching on (ZVS) by freewheeling the inductor current of the converters to flow through the intrinsic diodes of the MOSFETS. The buck-boost converter is operated at discontinuous-conduction mode (DCM) to perform the function of power-factor correction to ensure almost unity power factor at the input line. The buck converter steps down the output voltage of the buck-boost converter to drive LEDs. It could be designed to operate at either DCM or continuous-conduction mode. The detailed circuit operations and analysis are provided. A prototype 60-W LED driver was built and tested. Experimental results show that the switching losses can be effectively reduced by operating the active switches at ZVS. The measured power factor and circuit efficiency are as high as 0.99% and 93%, respectively.
Keywords :
driver circuits; inductors; light emitting diodes; losses; power MOSFET; power factor correction; power semiconductor diodes; power semiconductor switches; switching convertors; zero voltage switching; DCM; LED driver; ZVS; active switch; auxiliary switch; buck-boost converter; continuous conduction mode; discontinuous-conduction mode; freewheeling; inductor current; light emitting diode; power 60 W; power MOSFET; power diode; power factor correction; snubber circuit; switching losses; unity power factor; zero voltage switching-on characteristics; DC-DC power converters; Inductors; Light emitting diodes; Switches; Switching loss; Zero voltage switching; Buck-boost converter; buck converter; light-emitting diode (LED); power-factor correction (PFC); zero-voltage switching (ZVS);
fLanguage :
English
Journal_Title :
Power Electronics, IEEE Transactions on
Publisher :
ieee
ISSN :
0885-8993
Type :
jour
DOI :
10.1109/TPEL.2013.2285560
Filename :
6630100
Link To Document :
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