Patent ID: 8223520

Claim:
A DC conversion apparatus comprising: a first transformer at least having a primary winding, a first secondary winding, and a second secondary winding; a second transformer at least having a primary winding and a first secondary winding; a parallel circuit having first and second series circuits connected in parallel, the first series circuit including a first reactor and the primary winding of the first transformer that are connected in series, the second series circuit including a second reactor and the primary winding of the second transformer that are connected in series; a conversion circuit configured to convert a DC voltage of a DC power source into an AC voltage and output the AC voltage to the parallel circuit; a first rectifying-smoothing circuit configured to rectify and smooth a first voltage generated by the first secondary winding of the first transformer into a first DC output; and a second rectifying-smoothing circuit configured to rectify and smooth a second voltage generated by the first secondary winding of the second transformer into a second DC output, the second voltage being different from the first voltage, wherein the second secondary winding of the first transformer is directly connected in parallel with the first secondary winding of the second transformer, thereby the first secondary winding of the first transformer and the first secondary winding of the second transformer are magnetically coupled to each other through the second secondary winding of the first transformer.