Patent ID: 8228690
Filing Date: 2012-07-24
Classification: H02J,H02M

Abstract:
1. A DC-DC converter comprising: a first-voltage-side port and a second-voltage-side port both of which are input ports, respectively; a third-voltage-side port which is an output port; a reference-voltage terminal common for inputting and outputting; first to fourth switching devices; a transformer including a core and a primary winding and a secondary winding both wound around the core: a backflow prevention diode having an anode connected to the first-voltage-side port; and a backflow prevention switching device having one end connected to the second-voltage-side port; the first switching device having one end connected to another end of the backflow prevention switching device, wherein the second switching device has one end connected to a cathode of the backflow prevention diode; the primary winding has one end connected to another end of the first switching device; the secondary winding has one end connected to another end of the second switching device; a first diode has a cathode connected to another end of the first switching device and has an anode connected to the reference-voltage terminal; a second diode has a cathode connected to another end of the second switching device and having an anode connected to the reference-voltage terminal; a third diode has an anode connected to another end of the primary winding and having a cathode connected to the third-voltage-side port; a fourth diode has an anode connected to another end of the secondary winding and having a cathode connected to the third-voltage-side port; the third switching device has one end connected to another end of the primary winding and having another end connected to the reference-voltage terminal; and the fourth switching device has one end connected to another end of the secondary winding and has another end connected to the reference-voltage terminal.