| 摘要 |
PROBLEM TO BE SOLVED: To provide a DC-DC converter having high efficiency.SOLUTION: A DC-DC converter is connected between a DC power supply V1 and a DC power-supply V2 to which a DC load 6 is connected, and supplies power from the DC power-supply V1 to the DC load 6 and the DC power supply V2. A smoothing capacitor C1 is connected between DC terminals of a switching circuit 1, a smoothing inductor L and a smoothing capacitor C2 are connected in series between DC terminals of a switching circuit 2, and the DC power supplies V1 and V2 are connected in parallel to the smoothing capacitors C1 and C2, respectively. A winding N1 is connected between AC terminals of the switching circuit 1, a winding N2 is connected between AC terminals of the switching circuit 2, and the winding N1 to the winding N2 are magnetically coupled by a transformer T. The DC-DC converter includes a resonance auxiliary circuit including a series connection body of a resonance auxiliary capacitor Cb and a switching element Sb, and blocks the charge to the resonance auxiliary capacitor Cb when the switching element Sb is in an off-state. |
