| 摘要 |
The present invention provides an isolated switch-mode power supply device capable of sufficiently reducing power consumption in a standby mode. An isolated switch-mode power supply device 1 includes: a capacitor C5 that supplies control power required for controlling switching of a switching element Q1; a first control unit 10 that includes a constant current supplying unit 14 for supplying a constant current and that controls the switching of the switching element Q1; a switching element Q11 that connects or disconnects the first control unit 10 and the capacitor C5; a capacitance element unit 121 having a capacitor C4 to which a constant current is supplied from the constant current supplying unit 14, a capacitor charge voltage of the capacitance element unit 121 changing according to an outputted voltage in the standby mode; and a second control unit 12 that controls power supply to the first control unit 10 by closing or opening the switching element Q11 during a switching pause period in the standby mode according to the capacitor charge voltage of the capacitor C4. |
