| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a power-supply device that allows improving output efficiency in a light-load region.SOLUTION: A power-supply device includes: a full-bridge circuit 10 for switching an input power supply and composed of a first switch Q1 to a fourth switch Q4; a resonant section 20 between a first connection node N1 between the first switch Q1 and the second switch Q2 and a second connection node N2 between the third switch Q3 and the fourth switch Q4; a transformer 30 connected in series to the resonant section and including a primary winding and a secondary winding; a rectifier circuit 40 for rectifying a voltage from the secondary winding; a sensing section for obtaining at least one of an output current and an output voltage from the rectifier circuit; and a control section 50 for controlling the first switch to the third switch included in the full-bridge circuit or controlling the second switch to the fourth switch included in the full-bridge circuit on the basis of at least one of the output current and the output voltage.</p> |
