Patent ID: 7589980
Filing Date: 2009-09-15
Classification: H02M

Abstract:
1. A DC-DC converter comprising: a first transformer including a primary winding and a secondary winding; a first series circuit in which the primary winding of the first transformer, a first reactor, and a current resonance capacitor are connected to one another in series; a converting circuit configured to convert a DC-DC voltage outputted from a DC power supply into an AC voltage, and to output the AC voltage to the first series circuit; a second transformer including at least a primary winding and a secondary winding which are tightly coupled with one another; a third transformer including at least a primary winding and a secondary winding which are tightly coupled with one another; a closed loop circuit in which the primary winding of the second transformer, the primary winding of the third transformer, and a second reactor constitute a closed loop; a second series circuit in which the secondary winding of the second transformer and the secondary winding of the third transformer are connected in series to both ends of the secondary winding of the first transformer; a first rectifying/smoothing circuit configured to rectify and smooth a voltage generated in the secondary winding of the second transformer, and to produce a first DC output; and a second rectifying/smoothing circuit configured to rectify and smooth a voltage generated in the secondary winding of the third transformer, and to produce a second DC output.