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. 29, 2012
Filed:
Dec. 11, 2008
Chihiro Sato, Kasama, JP;
Mitsuhiko Watanabe, Odawara, JP;
Ko Moriya, Hitachinaka, JP;
Hirofumi Kurimoto, Hitachinaka, JP;
Chihiro Sato, Kasama, JP;
Mitsuhiko Watanabe, Odawara, JP;
Ko Moriya, Hitachinaka, JP;
Hirofumi Kurimoto, Hitachinaka, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
There is a need for improving switching regulator characteristics and providing a stable power supply controller. The power supply controller uses a battery and either or both functions of stepping up and stepping down a battery voltage. The power supply controller includes a means that prevents a ripple voltage from occurring by stopping the up conversion function for a switching operation in connection with a battery during a predetermined period without changing conditions for a conventional switching device or smoothing circuit and fast stabilizes a primary voltage using only the down conversion function.