Switching power supply circuit

Details Switching power supply circuit Switching power supply circuit

1996-09-11

1998-11-17

Hecker, Stuart N.

Electric power conversion systems

Current conversion

Including automatic or integral protection means

363 19, H02H 7122, H02M 3335

Patent

active

058385568

ABSTRACT:
A switching power supply circuit capable of accuraely performing a switching starting operation at a large load while reducing power consumption during an overload state is a back-boost type switching power supply circuit and includes a first transistor provided on a primary side and a second transistor which controls the first transistor, a first rectified output generation circuit for rectifying and outputting a forward mode output from a first auxiliary winding, a second rectified output generation circuit for rectifying and outputting a back-boost mode output from a second auxiliary winding, a threshold value circuit for judging presence of an overload state when the output of the second rectified output generation circuit is below a predetermined threshold value, a third transistor for oscillation control which brings the first transistor into an intermittent oscillation state when the overload state has been judged, and a differentiating circuit for detecting a starting time by differentiating the output of the first rectified output generation circuit and interrupting the switching control stop output.

REFERENCES:
patent: 4754386 (1988-06-01), De Weerd
patent: 4956761 (1990-09-01), Higashi
patent: 5424933 (1995-06-01), Illingworth
patent: 5465201 (1995-11-01), Cohen
patent: 5528483 (1996-06-01), Mohandes

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