| 摘要 |
PROBLEM TO BE SOLVED: To reduce a size of a switching power supply device by enabling driving of a switching power supply of a current resonance type at a high frequency.SOLUTION: In a power supply device, first switching means and second switching means are provided so as to be connected in series, a primary side of a transformer is driven through alternate switching of the first switching means and the second switching means, a voltage occurring on a secondary side of the transformer is rectified and smoothed, and control means outputs a signal for driving the first switching means and the second switching means in accordance with an output after the rectification and the smoothing, wherein the control means sets a time, in which the first switching means and the second switching means are set off, based on a frequency for driving the first switching means and the second switching means. |
