Variable on-time controlled ZVS buck PFC converter for HB-LED application

Author

Yang, Jianyou ; Wu, Xinke ; Zhang, Junming ; Qian, Zhaoming

Author_Institution

Coll. of Electr. Eng., Zhejiang Univ., Hangzhou, China

fYear

2011

fDate

6-11 March 2011

Firstpage

65

Lastpage

70

Abstract

In high voltage AC input applications, buck PFC has the advantage of outputting a lower level voltage. This paper presents a variable on-time control buck PFC front-end for high-brightness light-emitting-diode (HB-LED) application, the function of the switch on-time in a half-line cycle is derived. Most high-order harmonics are lowered comparing to the constant on-time control in order to comply with IEC-61000-3-2 Class C standard. Experimental results obtained on a 150W prototype, including a LLC bus-converter as the 2nd stage show the overall efficiency exceeds 92.5% across the entire line input (250-530Vac), and the line current harmonics content can meet the related Class C limits.

Keywords

IEC standards; brightness; harmonic distortion; light emitting diodes; power convertors; power factor correction; zero voltage switching; IEC-61000-3-2 Class C standard; LLC bus-converter; constant ontime control; half-line cycle; high voltage AC input application; high-brightness light-emitting-diode application; high-order harmonic; line current harmonic; power 150 W; variable ontime controlled ZVS buck PFC converter; voltage 250 V to 530 V; Current measurement; Driver circuits; Harmonic analysis; Light emitting diodes; Modulation; Switches; Voltage measurement;

fLanguage

English

Publisher

ieee

Conference_Titel

Applied Power Electronics Conference and Exposition (APEC), 2011 Twenty-Sixth Annual IEEE

Conference_Location

Fort Worth, TX

ISSN

1048-2334

Print_ISBN

978-1-4244-8084-5

Type

conf

DOI

10.1109/APEC.2011.5744577

Filename

5744577