Inductor current measurement and regulation using a single dc link current sensor for interleaved dc–dc converters

IEEE TRANSACTIONS ON POWER ELECTRONICS, VOL. 26, NO. 5, MAY 2011

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Inductor Current Measurement and Regulation Using a Single DC Link Current Sensor for Interleaved DC–DC Converters
Hongrae Kim, Member, IEEE, Milad Falahi, Student Member, IEEE, Thomas M. Jahns, Fellow, IEEE, and Michael W. Degner, Senior Member, IEEE

Abstract—Inductor current measurements using only a single dc link current sensor in an interleaved dc–dc converter is introduced in this paper. This technique is appealing for the interleaved dc– dc converter because it minimizes the number of current sensors, thereby reducing sensor cost, weight, and volume. A combination of analytical and experimental results is provided to confirm that the single dc link current sensor technique is capable of achieving attractive performance characteristics in the areas of inductor current reconstruction, inductor current regulation, and output voltage regulation for the interleaved dc–dc converter. Index Terms—DC link current sensor, inductor current reconstruction, inductor current regulation, interleaved dc–dc converter, output voltage regulation, single current sensor technique.

Fig. 1. Two-stage interleaved dc–dc converter. (a) Boost converter. (b) Buck converter.

I. INTRODUCTION

T

HE INTERLEAVED dc–dc converter has gained increasing attention for many applications such as the interface between the battery and the dc bus of ac inverters in hybrid electric vehicle applications. The interleaved dc–dc converter consists of identical dc–dc converter stages connected in parallel. Fig. 1 shows examples of the two-stage interleaved dc–dc converter in both buck and boost configurations. Demands for compact and lightweight power sources with higher power density and higher efficiency have dramatically increased in recent years. Paralleling the converters has drawn attention as a solution to help meet these demands since this approach makes it possible to share current among several stages. By