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Transient Current Suppression Scheme for Bi-Directional DC/DC Converters in 42V Automotive Power Systems  

Lee, Woo-Cheol (Dept. of Electrical Engineering, Hankyong National University)
Yoo, Chang-Gyu (lnterpower Company Ltd.)
Lee, Kyu-Chan (lnterpower Company Ltd.)
Cho, Bo-Hyung (The School of Electrical Engineering, Seoul National University)
Publication Information
Journal of Power Electronics / v.9, no.4, 2009 , pp. 517-525 More about this Journal
Abstract
42V electrical power systems are on their way to replacing the present l4V systems in automobiles and 42V/14V dual voltage systems have been proposed to provide backward compatibility with the existing components for the 14V systems. A synchronous buck/boost converter is an attractive topology for 42V/14V dual voltage systems since it offers the possibility of bi-directional operation without additional components. In this paper, transient currents generated during converter startup or changes in operation modes between buck and boost are analyzed and a cost effective solution to remove the transient currents is proposed. The validity of the proposed control strategy is investigated through simulation and experiment with bi-directional converters.
Keywords
Dual voltage system; Bi-directional operation; Buck/Boost converter;
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