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. 06, 2000
Filed:
Jun. 14, 1999
Fumiaki Nakao, Shizuoka, JP;
Satoshi Ohta, Shizuoka, JP;
FDK Corporation, Tokyo, JP;
Abstract
A ringing choke converter capable of reducing the variation in a switching frequency to a low level even if the variation in load is large is disclosed. The ringing choke converter also serves for improvement of efficiency and solution of noise-problems. A ringing choke converter comprises a turn-on control system which detects the turn-off of the switching transistor Q1, and forcedly turns on the switching transistor Q1 after a predetermined amount of time. This turn-on control system comprises a conductive-type controlling transistor Q3 which is a different type from the switching transistor Q1, a resistance R3, and a capacitor C3. The collector of the controlling transistor Q3 is connected to the connecting point between the resistance R2 and the capacitor C2. The emitter of the transistor Q3 is connected to one end of the base winding L3. The resistance R3 is connected between the base of the transistor Q3 and the other end of the base winding L3. The capacitor C3 is connected between the base and the emitter of the transistor Q3.