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:
May. 15, 2012
Filed:
Sep. 03, 2009
Norihito Tokura, Okazaki, JP;
Hisato Kato, Nagoya, JP;
Norikazu Kanatake, Okazaki, JP;
Masakiyo Horie, Gamagori, JP;
Norihito Tokura, Okazaki, JP;
Hisato Kato, Nagoya, JP;
Norikazu Kanatake, Okazaki, JP;
Masakiyo Horie, Gamagori, JP;
Denso Corporation, Kariya, JP;
Abstract
A synchronous-rectifier type DC-DC converter includes a high-side main switch element, a low-side rectifying switch element, and a control drive circuit. The rectifying switch element includes a rectifying transistor element and a rectifying diode element connected in antiparallel with the rectifying transistor element. The control drive circuit detects an input voltage to the main switch element and determines the input voltage or a rate of increase in the input voltage. When the determined value exceeds a predetermined reference value, a complementary ON/OFF operation of the main switch element and the rectifying transistor element is released, and a state where both the main switch element and the rectifying transistor element are kept OFF for a time period that is longer than a dead-time during the complementary ON/OFF operation is set.