| 摘要 |
A switching power supply has a bottom detection circuit (55), which judges whether or not a bottom has been reached, based on a voltage of a capacitor (C9) that determines an off time of a switching element (Q1) that generates a voltage at the secondary side of a transformer (13) and, in the case in which the judgment is made that a bottom has not occurred, a charging voltage for the capacitor (C9) is switched to a high-potential side.
|
