Abstract: 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.

Abstract: 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.

Abstract: 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 are connected in parallel with the DC power source and rectification circuit parts are provided to the output sides of each of the conversion circuit parts through transformers and series capacitors are inserted and connected between each of the conversion circuit parts and the transformers is used as unitary units and n groups of the unitary units are provided with respect to the DC power source E and the transformer secondary sides of one rectification circuit parts of each of the unitary units are connected in series among the n groups and also the transformer secondary sides of the other rectification circuit parts are connected in series among the n groups.

Abstract: A DC—DC converter has converter circuit portions 11 and 12, transformers Tr1 and Tr2, and rectifier circuit portions 21 and 22. Two sets of converter circuit portions 11 and 12 respectively include two pairs of switching elements Q1 to Q4, and two pairs of switching elements Q5 to Q8 connected in full bridge configuration, series capacitors C1 and C2 are inserted and connected between the converter circuit portions 11 and 12 and the transformers Tr1 and Tr2 respectively. The switching phase of one switching element Q4 or Q8 is shifted by a 1/3n period from the switching phase of the other switching element Q1 or Q5 in the pair of switching elements. The switching phases of corresponding switching elements Q1 and Q5 in the converter circuit portions 11 and 12 are shifted by a 1/2n period from each other.

Abstract: A DC-DC converter has converter circuit portions 11 and 12, transformers Tr1 and T r2, and rectifier circuit portions 21 and 22. Two sets of converter circuit portions 11 and 12 respectively include two pairs of switching elements Q1 to Q4, and two pairs of switching elements Q5 to Q8 connected in full bridge configuration, series capacitors C1 and C2 are inserted and connected between the converter circuit portions 11 and 12 and the transformers Tr1 and Tr2 respectively. The switching phase of one switching element Q4 or Q8 is shifted by a 1/3n period from the switching phase of the other switching element Q1 or Q5 in the pair of switching elements. The switching phases of corresponding switching elements Q1 and Q5 in the converter circuit portions 11 and 12 are shifted by a 1/2n period from each other.