Self-oscillation type switching power supply and method

Details Self-oscillation type switching power supply and method Self-oscillation type switching power supply and method

1999-01-04

2000-10-24

Wong, Peter S.

Electric power conversion systems

Current conversion

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

H02M 3335

Patent

active

061376957

ABSTRACT:
A self-oscillation type switching power supply apparatus comprises a transformer T having a primary winding N1, a secondary winding N2, and a feedback winding N.sub.B, a switching transistor Q1 to interrupt current in the primary winding supplied with an input power supply voltage, a feedback signal being provided from the feedback winding N.sub.B and a rectifying smoothing circuit connected to the secondary winding. The self-oscillation type switching power supply apparatus further comprises a controlling transistor Q3 to control a positive feedback signal for the switching transistor Q1 from the feedback winding N.sub.B, and a detector detecting a flyback voltage produced in the feedback winding N.sub.B when the switching transistor Q1 is turned off, and changing-over the state of the controlling transistor Q3 to keep the switching transistor Q1 in the off-state when the flyback voltage goes lower than a predetermined value.

REFERENCES:
patent: 5675479 (1997-10-01), Tani et al.
patent: 5864472 (1999-01-01), Peterson
patent: 5995382 (1999-11-01), Miyazaki et al.

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