Switching power supply circuit

Details Switching power supply circuit Switching power supply circuit

2011-03-22

2011-03-22

Riley, Shawn (Department: 2838)

Electric power conversion systems

Current conversion

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

C363S131000

Reexamination Certificate

active

07911809

ABSTRACT:
A switching power supply circuit includes a direct current (DC) power supply input terminal, a first transformer including a first primary winding, a second transformer, and a pulse generating circuit, and a startup circuit. The pulse generating circuit includes first and second first switching units connected in series and two voltage division resistors connected in series between the DC power supply input terminal and ground, and two capacitors connected in parallel with one of the two voltage division resistors. The second transformer includes a second primary winding connected between control terminal and second conducting terminal of the first switching unit, a second secondary winding; and an assistant winding connected between the control terminal of the second switching unit and ground. The second conducting terminal of the first switching unit is grounded via the second secondary winding, the first primary winding and a capacitor in series.

REFERENCES:
patent: 4648017 (1987-03-01), Nerone
patent: 5130610 (1992-07-01), Kakitani
patent: 5138543 (1992-08-01), Harm et al.
patent: 5485365 (1996-01-01), Dan-Harry
patent: 7315460 (2008-01-01), Kyono
patent: 2071863 (1991-02-01), None
patent: 100355192 (2007-12-01), None

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