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. 07, 2011
Filed:
Jun. 15, 2007
Ryuta Nagai, Kasugai, JP;
Takashi Matsumoto, Kasugai, JP;
Koichi Inatomi, Kasugai, JP;
Fujitsu Semiconductor Limited, Yokohama, JP;
Abstract
To provide a control circuit and control method of a step-up/step-down type DC-DC converter capable of realizing high efficiency. In a state (), a terminal Tx of a choke coil Lis connected to an input terminal Tin, and a terminal Ty is connected to a reference potential. In a state (), the terminal Tx is connected to the reference potential, and the terminal Ty is connected to an output terminal Tout. In the state (), the terminal Tx is connected to the input terminal Tin, and the terminal Ty is connected to the output terminal Tout. A first period operation TOis constituted by the states () and (), and a second period operation TOis constituted by the states () and (). A second period T, in which the second period operation TOis performed, is a value n times as long as a first period T, in which the first period operation TOis performed. In the second period operation TO, the state () is switched to the state () so that an increasing slope of an inductor current IL is reduced.