Nissin Electric Co., Ltd.

Nobuhiro Kurio

Takaya Hasebe

Mitsuru Matsukawa

Hitoshi Nakagaki

A circuit configuration in which a pair of conversion circuit parts for converting a power source voltage of a DC power source into an AC by two pairs of switching elements made of a full bridge configuration and a pair of transformers is used as inverter units. The n groups of the inverter units are provided with respect to the DC power source, and a secondary side of one transformer of each of the inverter units are connected in series among the n groups and also a secondary side of the other transformer are connected in series among the n groups.

DC-DC converter

A DC&mdash;DC converter has converter circuit portions and transformers Tr and Tr , and rectifier circuit portions and Two sets of converter circuit portions and respectively include two pairs of switching elements Q to Q , and two pairs of switching elements Q to Q connected in full bridge configuration, series capacitors C and C are inserted and connected between the converter circuit portions and and the transformers Tr and Tr respectively. The switching phase of one switching element Q or Q is shifted by a 1/3n period from the switching phase of the other switching element Q or Q in the pair of switching elements. The switching phases of corresponding switching elements Q and Q in the converter circuit portions and are shifted by a 1/2n period from each other.

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Kyoto, Japan

Nobuhiro Kurio