Patent ID: 8576582
Filing Date: 2013-11-05
Classification: H02M

Abstract:
1. A bidirectional DC-DC converter comprising: a transformer having a primary winding and a secondary winding; a current-source power converter that is connected with the primary winding; a capacitor that is connected in series with the secondary winding; and a voltage-source power converter that is connected with the secondary winding via the capacitor, wherein the current-source power converter includes: the current-source power converter further includes an inductor which forms a current source with the direct-current power supply, the current source supplying direct current, the inductor being arranged between a positive side of the direct-current power supply and a center tap of the primary winding of the transformer, the voltage-source power converter includes: the secondary winding of the transformer is provided between a connecting point of the third switching element and the fourth switching element and a connecting point of the fifth switching element and the sixth switching element, wherein when the direct-current power supply discharges, current that flows into the transformer is controlled by a switching operation of the first and second switching elements, so that direct current supplied from the current source is converted into alternating current, and the alternating current is output to the voltage-source power converter through the transformer, the alternating current output through the transformer is rectified by a switching operation of the third to sixth switching elements and supplied to a load, the load being connected in parallel with the first series circuit and the second series circuit, when the direct-current power supply charges, a voltage to be applied to the transformer is controlled by a switching operation of the third to sixth switching elements, so that direct current supplied from the load is converted into alternating current, and the alternating current is output to the current-source power converter through the transformer, the alternating current output through the transformer is rectified by a switching operation of the first and second switching elements and supplied to the direct-current power supply, the direct-current power supply being connected in parallel with the first switching element and the second switching element, wherein the capacitor reduces biased magnetization of the transformer, when the direct-current power supply discharges and when the direct-current power supply charges.