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. 31, 2005
Filed:
Jul. 28, 2003
Akihiro Odaka, Tokyo, JP;
Akihiro Odaka, Tokyo, JP;
Fuji Electric Co., Ltd., , JP;
Abstract
Method and apparatus for controlling a DC-DC converter change the switching frequency of the switching devices and the on-off ratio of the switching devices. The on-off ratio can be changed in response to the output voltage and the switching frequency can be changed in response to the input voltage supplied by the DC power supply. Alternatively, the switching frequency can be changed while the on-off ratio is fixed at a certain value, and the on-off ratio can be changed while the switching frequency is fixed at a predetermined value after the switching frequency has reached the predetermined value, thereby preventing the switching frequency from exceeding the predetermined value.