The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 20, 2000
Filed:
Jan. 28, 1999
Ryuji Okamura, Nagaokakyo, JP;
Naoki Tanaka, Nagaokakyo, JP;
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 for interrupting a current in said primary winding N1; a controlling transistor Q2 for controlling a positive feedback signal for said switching transistor Q1 from said feedback winding N.sub.B ; a time constant circuit adapted to be charged by a voltage produced in said feedback winding N.sub.B at a predetermined time constant and to give a controlling voltage to said controlling transistor Q.sub.2 ; a light emitting element of a photocoupler provided in a circuit for detecting an output voltage or output current from the secondary of said transformer T; a photodetector of said photocoupler connected to said time constant circuit whereby the time constant of said time constant circuit is changed in dependence on the detection of the output voltage or output current to stabilize the output voltage or output current; and a conducting path provided between an input power-supply voltage supplying section for the primary of said transformer T and a voltage-supplying section for said photodetector of the photocoupler.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile