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:
Aug. 28, 2001
Filed:
May. 16, 2000
Toshitaka Minamisawa, Nagano, JP;
Atsushi Matsuzaka, Nagano, JP;
Nagano Japan Radio Co., Ltd., Nagano, JP;
Abstract
A drive circuit for a switching power supply includes a driving element (,) for generating a drive signal (SD), and a transformer (,) for outputting the drive signal input via a capacitive element to a primary winding (15,) thereof (,), to a main switching element (,) from a secondary winding (,) thereof. The drive circuit (,) is constructed such that breakage of the main switching element (,) can be prevented while permitting an increase in the range of switching control. The drive circuit (,) is characterized by comprising an inductive element (,) having an inductance value smaller than at least a value of an excitation inductance of the primary winding (,) and allowing series resonance to be produced between the capacitive element (,) and the inductive element (,).