| 摘要 |
PROBLEM TO BE SOLVED: To provide a DC-DC converter capable of realizing an output voltage and power corresponding to a wide range of input voltage and power.SOLUTION: When input power from a second circuit 2 side is to be supplied to a first circuit 1 side, upper-arm switching elements 21S, 23S of first or second legs 21, 22 and lower-arm switching elements 24S, 22S of second or first legs 22, 21 are alternately turned on and off as a set, so that an output voltage on first and second terminals T1, T2 side converted in terms of a transformer winding ratio is higher than an input voltage on third and fourth terminals T3, T4 side. When the switching elements 22S and 23S or 21S and 24S constituting a set are both in an ON state, electrical continuity in a switching element 11S or 12S of the first circuit 1 is established, and energy is accumulated in inductance means L, whereby the switching element 11S or 12S in the ON state is turned off. |
