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. 23, 2009
Filed:
Feb. 07, 2006
Junpei Uruno, Naka, JP;
Hiroyuki Shoji, Hitachi, JP;
Akihiko Kanouda, Hitachinaka, JP;
Yasuo Kaminaga, Hitachi, JP;
Junpei Uruno, Naka, JP;
Hiroyuki Shoji, Hitachi, JP;
Akihiko Kanouda, Hitachinaka, JP;
Yasuo Kaminaga, Hitachi, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A soft switching DC-DC converter is provided which includes circuitry for both a buck converter and a boost converter. The buck converter circuitry and the boost converter circuitry share a common transformer including a primary coil and first and second secondary coils. A first switching element is coupled to a first capacitor to provide the buck converter operation while another switching element is provided to provide the boost converting operation. The primary coil of the transformer is commonly used as a choke coil by both the buck converter and the boost converter. In this way, size and cost reduction can be obtained.