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. 09, 2003
Filed:
Jul. 30, 2002
Saori Muraki, Tokyo, JP;
Makoto Yamamoto, Tokyo, JP;
Yuji Honma, Tokyo, JP;
Shinichi Shinohara, Tokyo, JP;
Origin Electric Company, Limited, Tokyo, JP;
Abstract
A capacitor charger is provided that can control charging voltage with high accuracy, and repeat a process of increasing it to a target charging voltage at high speed. In a first step, an ac voltage is generated in a resonant type inverter section by fixed frequency driving pulses, the ac voltage is converted to a dc voltage, a load capacitor is charged by the dc voltage, a calculation pulse in the driving pulse has a predetermined, fixed driving pulse width, and the load capacitor is charged by &Dgr;Vn each pulse. In a second step, when the charging voltage V of the load capacitor and the target voltage V satisfy an inequality relationship “V >V >V −&Dgr;Vn”, charging is performed by a single or a plurality of final pulses having a driving pulse width W (W >W ) as required to step up the voltage by “V −V