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:
Sep. 11, 2007
Filed:
Apr. 03, 2006
Koji Kawasaki, Anjo, JP;
Keiji Shigeoka, Okazaki, JP;
Shinya Goto, Gifu, JP;
Denso Corporation, Kariya, JP;
Nippon Soken, Inc., Nishio, JP;
Abstract
A switching device and a method of operating a switching power element are disclosed for generating a train of drive pulses (Dto D) in a basic pattern for a repetition cycle time (T to TF) having leading time intervals (Thto Th, Th' to Th′), associated with leading edges (ato a) of the drive pulses, and trailing time intervals (Tlto Tl, Tl′ to Tl′), associated with trailing edges (bto b) of the drive pulses, which are different from each other, whereby switching frequencies and associated harmonics, resulting from the leading edges and the trailing edges of the drive pulses, are diffused. A diffusion frequency, representing an inverse number of the repetition cycle time for the basic pattern is set to be higher than an audible frequency.