Patent ID: 9570993
Date: 2017-02-14
CPC Classifications: H02M,Y02B

Claim:
1. A DC-DC converter, comprising: a full-bridge inverter constituted of a reference phase leg and a control phase leg that are connected in parallel with each other and each include an upper arm and a lower arm connected in series with each other and each including at least a switching element and a freewheel diode connected in antiparallel to the switching element; a series reactor that is connected to at least one of the output terminals of each leg and also connected to a primary-side terminal of a transformer; and a rectifier circuit that rectifies an induced voltage by the transformer and a filter circuit that smooths an output DC voltage from the rectifier circuit, which are connected to secondary-side terminals of the transformer; the DC-DC converter further comprising: a circulation current generation mode in which a circulation current that flows between the transformer and the switching elements is generated in a power non-transmission period; and a circulation current interruption mode in which the circulation current is interrupted; wherein a period in which the reference phase is in the ON state is made different from a period in which the control phase is in the ON state, and a switching pattern for the control phase leg and another switching pattern for the reference phase leg are exchanged with each other for each switching period.