Patent ID: 7638904
Filing Date: 2009-12-29
Classification: H02M,Y02B

Abstract:
1. An isolated bidirectional DC-DC converter comprising: a first DC power source; a first switching circuit connected between said first DC power source and a primary winding of a transformer for converting power mutually between direct current and alternating current; a second switching circuit which is a current fed type switching circuit capable of dropping or increasing a voltage including a reactor connected between a secondary winding of said transformer and a positive pole of a second DC power source and is connected with the positive pole of the second DC power source through said reactor; a voltage clamp circuit including a series unit of a switching device with a reverse parallel diode and a capacitor; wherein one terminal of the series unit is electrically connected to one terminal of the second DC power source; wherein the other terminal of the series unit is connected to a connecting point connected in series of said secondary winding of the transformer and said second switching circuit; wherein said connecting point is connected to the positive terminal of the second DC power source through said reactor, and wherein at time of buck, energy which is charged in said capacitor is discharged into the second DC power source side through said reactor.