Single-Stage AC/DC Converter With Input-Current Dead-Zone Control for Wide Input Voltage Ranges

Author

Lee, Jun-Young

Author_Institution

Sch. of Electron. & Comput. Eng., Dankook Univ., Cheonan

Volume

54

Issue

2

fYear

2007

fDate

4/1/2007 12:00:00 AM

Firstpage

724

Lastpage

732

Abstract

A single-phase single-stage ac/dc converter with input-current dead-zone control is proposed. It is based on flyback topology operating in discontinuous conduction mode (DCM). The current charging into the link capacitor is controlled according to line changes by adjusting the input-current blocking angle to alleviate an excessive increase of the link voltage. The reduced voltage stress can maintain an almost-constant voltage irrespective of load conditions by operating in dc/dc stage in DCM. Experimental results of a 60-W (5-V 12-A output) prototype converter show that the link voltage is limited within 384 V and that the measured power factor is more than 0.91 under universal voltage inputs and entire load conditions. In addition, the maximum efficiency is measured to be about 81% at the rated condition

Keywords

AC-DC power convertors; electric current control; power capacitors; power factor; 12 A; 5 V; 60 W; DC-DC stage; DCM; capacitor current charging; discontinuous conduction mode; flyback topology; input-current dead-zone control; power factor; single-stage AC-DC converter; Capacitors; Circuits; DC-DC power converters; Power harmonic filters; Power system harmonics; Prototypes; Reactive power; Stress; Transformers; Voltage control; AC/DC converter; flyback; power-factor correction;

fLanguage

English

Journal_Title

Industrial Electronics, IEEE Transactions on

Publisher

ieee

ISSN

0278-0046

Type

jour

DOI

10.1109/TIE.2007.891765

Filename

4118388