Patent ID: 8378646
Filing Date: 2013-02-19
Classification: H02M

Abstract:
1. A bidirectional DC-DC converter comprising: a first smoothing capacitor which is connected between a first DC power supply and a first switching circuit and connected in parallel between the first DC power supply and DC terminals of the first switching circuit; a second smoothing capacitor which is connected in parallel with a second DC power supply and connected between DC terminals of a second switching circuit; a primary winding which is connected between AC terminals of the first switching circuit; a secondary winding which is connected between AC terminals of the second switching circuit; a transformer which magnetically couples the primary winding to the secondary winding; control means which controls the first and the second switching circuits so as to transfer electrical power between the first and the second DC power supplies; a first diode which is inserted in series, in a direction to prevent the electrical power from flowing from the first smoothing capacitor into the first switching circuit, between the first smoothing capacitor and the DC terminals of the first switching circuit to ensure that a cathode faces a positive electrode of the first DC power supply; and a first switch which is connected in parallel with the first diode; wherein the control means is configured to turn on the first switch when supplying electrical power from the first DC power supply to the second DC power supply and is configured to turn off the first switch when supplying electrical power from the second DC power supply to the first DC power supply.