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Analysis of Inductor Current Sharing in Nonisolated
and Isolated Multiphase dc–dc Converters
Hong Mao, Member, IEEE, Liangbin Yao, Student Member, IEEE, Caisheng Wang, Member, IEEE,
and Issa Batarseh, Fellow, IEEE
Abstract
Current sharing among inductors is an important
issue in both isolated and nonisolated dc–dc converters. In this paper,
average current sharing is in-depth modeled and analyzed for
both interleaved multiphase buck converters and isolated currentdoubler
dc–dc converters. The features and comparison of various
current-sharing techniques used in isolated and nonisolated dc–dc
converters are presented, and the corresponding design guidelines
are provided based on the theoretical analysis. The analysis reveals
that the state-of-the-art current-sharing technique for multiphase
buck converters cannot be directly applied to isolated currentdoubler
rectifier (CDR) dc–dc converters to achieve balanced
inductor currents. Passive and active current-sharing methods
are proposed for isolated current-doubler dc–dc converters to
balance two inductor currents. Experimental results are presented
to verify the modeling analysis and the proposed current-sharing
techniques for CDRs in isolated dc–dc converters.
Index Terms—Converter, current doubler, current sharing,
dc–dc, interleaving, rectifier, synchronous rectifier. |
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发表于 2009-4-7 16:06:42
