Switching power source apparatus

Details Switching power source apparatus Switching power source apparatus

2011-08-30

2011-08-30

Berhane, Adolf (Department: 2838)

Electric power conversion systems

Current conversion

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

Reexamination Certificate

active

08009445

ABSTRACT:
A switching power source apparatus includes a switching element connected through a primary winding of a transformer to a voltage terminal of a DC input voltage, a rectifying-smoothing circuit to rectify and smooth a voltage induced by a secondary winding of the transformer and provide a DC output voltage, a control circuit for controlling ON/OFF of the switching element, and a delay circuit to generate a predetermined delay time. The control circuit detects the DC input voltage, starts a switching operation of the switching element if the DC input voltage has increased to or above a threshold value, and stops the switching operation of the switching element if the DC input voltage is lower than the threshold value and that a period during which the DC input voltage is continuously lower than the threshold value has reached the predetermined delay time.

REFERENCES:
patent: 5151907 (1992-09-01), Robbins
patent: 6462972 (2002-10-01), Nagai et al.
patent: 6531855 (2003-03-01), Miki et al.
patent: 7176660 (2007-02-01), Usui et al.
patent: 2007/0217234 (2007-09-01), Nakamura
patent: 2008/0175027 (2008-07-01), Shimada et al.
patent: 2005-328589 (2005-11-01), None
U.S. Appl. No. 12/345,042, filed Dec. 29, 2008, Nakamura.

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