Single-Stage AC/DC Converter With Input-Current Dead-Zone Control for Wide Input Voltage Ranges
Jun-Young Lee
Sch. of Electron. & Comput. Eng., Dankook Univ., Cheonan;
This paper appears in: Industrial Electronics, IEEE Transactions on
Publication Date: April 2007
Volume: 54,
Issue: 2
On page(s): 724-732
ISSN: 0278-0046
INSPEC Accession Number: 9400421
Digital Object Identifier: 10.1109/TIE.2007.891765
Current Version Published: 2007-03-05
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
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