Reduction in Circulating Current With Improved Secondary Side Modulation in Isolated Current-Fed Half Bridge AC-DC Converter

Current-fed half bridge converter with bidirectional switches on ac side and a full bridge converter on dc side of a high frequency transformer is an optimal topology for single stage galvanically isolated ac-dc converter for onboard vehicle charging application. The ac side switches are actively co...

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Bibliographic Details
Published in:IEEE transactions on power electronics 2022-05, Vol.37 (5), p.5625-5636
Main Authors: Kumar, Manish, Pramanick, Sumit, Panigrahi, B. K.
Format: Article
Language:English
Subjects:
AC-DC converters
AC–DC converter
Alternating current
Bridge circuits
Clamps
current-fed half bridge
Electric bridges
Electric converters
Electric mains
Electric potential
improved discontinuous current phase shift modulation (IDCPSM)
Inductors
Modulation
Phase modulation
Phase shift
single stage
Switches
Switching
Topology
Voltage
Zero current switching
Zero voltage switching
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Summary:Current-fed half bridge converter with bidirectional switches on ac side and a full bridge converter on dc side of a high frequency transformer is an optimal topology for single stage galvanically isolated ac-dc converter for onboard vehicle charging application. The ac side switches are actively commutated to achieve zero current switching (ZCS) using single phase shift modulation (SPSM) and discontinuous current phase shift modulation (DCPSM). Furthermore, zero voltage turn- on (ZVS) is achieved for dc side switches. Compared with SPSM, DCPSM maintains a constant peak current in the converter throughout the grid cycle of ac mains voltage. However, constant peak current contributes to a high circulating current near the zero crossings of ac mains voltage and also at light load conditions. This article proposes an improved discontinuous current phase shift modulation to increase the efficiency of the converter across different loading conditions. A dual control variable is adopted to actively reduce the circulating current while maintaining soft switching of both ac and dc side switches across the grid cycle of ac mains voltage. A 1.5-kW laboratory prototype has been developed to experimentally validate the analysis, design, and improvement in performance for different loading conditions.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2021.3131354