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:
Dec. 29, 2009
Filed:
Aug. 18, 2005
Hiroyuki Shoji, Chiyoda-ku, JP;
Akihiko Kanouda, Chiyoda-ku, JP;
Ryuichi Saito, Chiyoda-ku, JP;
Seigou Yukutake, Chiyoda-ku, JP;
Katsuhiro Higuchi, Chiyoda-ku, JP;
Hiroyuki Shoji, Chiyoda-ku, JP;
Akihiko Kanouda, Chiyoda-ku, JP;
Ryuichi Saito, Chiyoda-ku, JP;
Seigou Yukutake, Chiyoda-ku, JP;
Katsuhiro Higuchi, Chiyoda-ku, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
The DC-DC converter connects a first and a second switching circuit for converting power mutually between direct current and alternating current respectively to a first DC power source and a second DC power source and has a transformer between the AC terminals thereof. Here, between the AC terminals of the second switching circuit and the negative pole terminal of the DC power source, a voltage clamp circuit composed of a series unit of switching devices with a reverse parallel diode and a clamp condenser is connected. An isolated bidirectional DC-DC converter which prevents a reduction in a circulating current at time of buck and an occurrence of a surge voltage at time of voltage boost and realizes highly efficiency, low noise, and miniaturization is provided.