An Investigation of Size‐Reduction Effects in High Power Density Boost Converters with a Magnetic Coupling

Abstract

SUMMARYThe dc-dc converter using integrated magnetic components that may achieve high power density has gained attention in environmentally friendly cars such as electric vehicles and hybrid electric vehicles. This paper focused on interleaved boost converters using close-coupled inductors (CCIs) and loose-coupled inductors (LCIs) that are the integrated magnetic components. Following, detailed electromagnetically analysis for these circuit types were conducted in order to calculate volume of inductors and capacitors that are occupied the large part of space in the converters. The total volume of inductors and capacitors in these circuits were demonstrated clearly through comparison with conventional circuits such as an interleaved boost converter and a single-phase boost converter. As a result, it became clear that interleaved boost converter using LCIs was effective for miniaturization of total volume. Furthermore, duty ratio of the minimum volume of CCI method is different from the duty ratio of the minimum volume of LCI method. C⃝ 2016 Wiley Periodicals, Inc. Electr Eng Jpn, 197(1): 35-45, 2016; Published online in Wiley Online Library (wileyonlinelibrary.com).

Four‐phase interleaved DC–DC step‐down converter using coupled inductor for high power application

“…Several types of interleaved dc-dc topologies were proposed, developed, and carefully studied, among them are unidirectional and bidirectional dc-dc converters for wide range in industrial application, for instance, electric vehicles, photovoltaic, fuel cells, renewable sources, hybrid systems, and battery power supplies. [1][2][3][4][5][6][7][8][9][10] The conventional dc-dc buck converter is widely used because of its practical function (output voltage reduction) and the simplicity of the topology, which is characterized without isolation and the low number of components. On the other hand, it is not suitable in applications that require a voltage gain above 0.8, due to the need of the operations with very high duty cycle values (duty cycle higher than 80%).…”