Switching power source apparatus

Details Switching power source apparatus Switching power source apparatus

2007-08-22

2009-06-09

Laxton, Gary L (Department: 2838)

Electric power conversion systems

Current conversion

With starting arrangement

C363S021080, C363S021160

Reexamination Certificate

active

07545657

ABSTRACT:
A switching power source apparatus includes a switching element connected through a primary winding of a transformer to a DC power source, a start circuit for a control circuit, a rectify-smooth circuit of a voltage of a secondary winding of the transformer, and a rectify-smooth circuit to rectify and smooth a voltage of a tertiary winding of the transformer into a source voltage for the control circuit. The start circuit supplies a first starting current to start the apparatus and stops the first starting current once the apparatus has started. If the source voltage to the control circuit decreases to a turn-off voltage after the apparatus has started, the start circuit supplies a second starting current that is smaller than the first starting current. If the source voltage to the control circuit further decreases to a predetermined voltage that is lower than the turn-off voltage, the start circuit supplies the first starting current.

REFERENCES:
patent: 6960906 (2005-11-01), Yamashita
patent: 2008/0175027 (2008-07-01), Shimada et al.
patent: 2003-333840 (2003-11-01), None
U.S. Appl. No. 12/212,285, filed Sep. 17, 2008, Nakamura.

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