Switching power supply device and method for controlling...

Details Switching power supply device and method for controlling... Switching power supply device and method for controlling...

2007-09-18

2007-09-18

Berhane, Adolf (Department: 2838)

Electric power conversion systems

Current conversion

Including d.c.-a.c.-d.c. converter

C363S097000

Reexamination Certificate

active

10538440

ABSTRACT:
By an NMOS (22) being switched on or off, a direct-current voltage E0is charged in a capacitor (24), and a DC/DC converting circuit (30) charges a direct-current output voltage V0to be supplied to a load L in a capacitor (34). A load state detection circuit (40) determines whether the load L is in a lightly loaded state or in a non-lightly loaded state, and outputs a signal (S40) as a determination signal. When the load state detection circuit (40) outputs a signal (S41) of “L” as a signal representing that it is a lightly loaded state, a time period setting circuit (41) outputs a signal (S41) of “L” after a preset time period elapses. A PFC on/off switching circuit (42) is supplied with the signal (S41) of “L”, and outputs a control signal (S25) of “L” to a power factor improvement circuit (20). Accordingly, in the case where the load L enters a lightly loaded state, the operation of the power factor improvement circuit (20) is stopped when the preset time elapses.

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