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:
Jul. 07, 2009
Filed:
Jan. 26, 2007
Junpei Uruno, Tokai, JP;
Hiroyuki Shoji, Hitachi, JP;
Akihiko Kanouda, Hitachinaka, JP;
Yasuo Kaminaga, Hitachi, JP;
Junpei Uruno, Tokai, JP;
Hiroyuki Shoji, Hitachi, JP;
Akihiko Kanouda, Hitachinaka, JP;
Yasuo Kaminaga, Hitachi, JP;
Hitachi, Ltd., Tokyo, JP;
Hitachi Appliances, Inc., Tokyo, JP;
Abstract
A unidirectional DC-DC converter which has a simple control circuit without using multiple insulated power supplies or a transformer, uses an auxiliary inductor of a comparatively small capacitance, reduces the size and weight of the converter, and has a very great capacitance without switching of supply current. For example, a unidirectional DC-DC converter equipped with main IGBTwhich supplies and shuts off current for first inductorand diodewhich discharges energy from main inductorto an the output. The DC-DC converter is further equipped with auxiliary IGBTwhich applies current to back-to-back-connected diodeby using energy stored in auxiliary inductorwhich is magnetically coupled with main inductor. This applies current to the back-to-back-connected diode in a short period including a time period in which the first switching element is turned on and accomplishes ZVZCS.