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:
Oct. 23, 2012
Filed:
Oct. 08, 2008
Yohichi Shiwaya, Osaka, JP;
Yohichi Shiwaya, Osaka, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A disclosed operation control method of a charge pump circuit for boosting an input voltage to a desired magnitude in the range between the input voltage and twice the input voltage and outputting the boosted voltage. The method includes the steps of (a) during a charging period, charging, with the input voltage, one or more of the capacitors connected in series by selectively turning on one or more of the first switches in accordance with the desired voltage magnitude, turning on the third switch, and selectively turning on the second switch or one of the fourth switches; and (b) during a discharging period, turning off the third switch and the second switch or the fourth switch having been turned on; selectively turning on one or more of the first switches; and turning on one or more fourth and the fifth switches.