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. 15, 2009
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 comprises a switching element, a setting member, and a control member. The switching element turns on/off in response to a drive signal, so as to control a controlled variable of a controlled system to a desired amount. The setting member sets the drive signal on the basis of both a desired duty to control the controlled variable, wherein the drive signal is set by repeating a basic pattern consisting of a plurality of intervals which are decided to remove overlaps, in a frequency spectrum, between or among switching frequencies produced based on an interval between start timings of the on operations and an interval between start timings of the off operations. The control member variably controls the switching element based on the drive signal.