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:
Feb. 06, 2001
Filed:
Jan. 19, 1999
Abstract
A switching power supply device comprises: a transformer having a primary winding, a secondary winding and a feedback winding; a switching element connected in series with the primary winding; a controlling element connected to a control terminal of the switching element; a controlling circuit provided between the controlling element and the feedback winding; a rectifying circuit connected to the secondary winding; and a frequency limiting circuit including a charging circuit and a kick voltage absorbing circuit. The charging circuit is adapted to be charged by a voltage reverse in polarity, produced in the feedback winding. The kick voltage absorbing circuit absorbs a current developed by a kick voltage in the feedback winding, by discharge of the charging circuit, whereby the frequency limiting circuit reducing the switching frequency of the switching element by prolongation of the off-state time-period of the switching element in correspondence to a light load signal from a load when the load is light.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile