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. 23, 2008
Filed:
Jul. 28, 2005
Takashige Ogata, Gunma, JP;
Tatsuya Suzuki, Saitama-ken, JP;
Takashige Ogata, Gunma, JP;
Tatsuya Suzuki, Saitama-ken, JP;
Sanyo Electric Co., Ltd., Osaka, JP;
Abstract
A step down DC-DC converter is reduced in the cost by reducing a number of capacitors included. The DC-DC converter is provided with switches that connect (n−1) capacitors in parallel with each other and switches that connect the capacitors in series with each other. In phasesome switches are turned on to connect the capacitors in parallel between an output terminal and a ground voltage so that the capacitors are charged. In phaseother switches are turned on to connect the capacitors in series between the output terminal and an input voltage so that the capacitors are discharged. A stepped down output voltage, that is 1/n times of the input voltage, is obtained by alternating the phaseand the phaseuntil a stable state is reached.