With the advancement of various devices for high performance, many superior circuit technologies have been also studied. One of main streams concerns a soft switching technology to mitigate switching stress, leading to the reduction in switching losses or electro-magnetic noise. On the other hand, as a characterized orthodox technology, the existing chopper circuit is used for the electric vehicles, etc. Such technologies have a tendency to go out of vogue as power supplies for like electric trains. However, as a boost chopper for the battery charger for an electric vehicle and the like, those technologies become a main stream, where a bilateral function is required. With the foregoing in mind, the authors have devised and analyzed the bilateral chopper using the soft-switch technolog. As a resonant component, a novel saturable inductor method is proposed and discussed, where peak current or voltage can be suppressed.
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