Quasi resonant type switching power supply apparatus with...

Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter

Reexamination Certificate

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C363S021160, C363S056100

Reexamination Certificate

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11372768

ABSTRACT:
A quasi resonant type switching power supplying unit includes an overcurrent limiting circuit and an oscillation level comparison circuit. The overcurrent limiting circuit (i.e., a level determining circuit and a reference voltage generating circuit) receives a reverse electromotive voltage generated from an auxiliary winding which is electromagnetically connected with a primary winding when a MOSFET is in an OFF state, and produces a reference voltage stepwise based on the reverse electromotive voltage. The oscillation level comparison circuit receives a feedback voltage corresponding to electric power supplied to a load, and produces a control signal that switches the MOSFET into an OFF state when the feedback voltage exceeds the reference voltage.

REFERENCES:
patent: 5424933 (1995-06-01), Illingworth
patent: 5812383 (1998-09-01), Majid et al.
patent: 5986897 (1999-11-01), Majid et al.
patent: 6094362 (2000-07-01), Domingo
patent: 6788556 (2004-09-01), Hosotani et al.
patent: 2003/0142514 (2003-07-01), Hosotani et al.
patent: 2007/0109820 (2007-05-01), Yang et al.
patent: 4-299067 (1992-10-01), None
patent: 9-271168 (1997-10-01), None
patent: 2002-238255 (2002-08-01), None
patent: 2003-61345 (2003-02-01), None
English Patent Abstract of JP 4-299067 from esp@cenet, published Oct. 22, 1992 (1 page).
English Patent Abstract of JP 9-271168 from esp@cenet, published Oct. 14, 1997 (1 page).
English Patent Abstract of JP 2002-238255 from esp@cenet, published Aug. 23, 2002 (1 page).
English Patent Abstract of JP 2003-061345 from esp@cenet, published Feb. 28, 2003 (1 page).

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