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:
Jul. 27, 1999
Filed:
Jun. 23, 1998
Yutaka Iwahori, Kadoma, JP;
Hiroichi Shinbori, Kobe, JP;
Tsutomu Shiomi, Kita Katsushika-gun, JP;
Shinji Hizuma, Ibaraki, JP;
Toshiaki Nakamura, Kadoma, JP;
Naoki Komatsu, Shijonawate, JP;
Takeshi Kamoi, Kadoma, JP;
Matsushita Electric Works, Ltd., Osaka, JP;
Abstract
A power source device is so arranged that one of switching elements forming a plurality of power conversion switching circuits which is used in common during each switching cycle is made to have a switching period in which mainly a current is taken up from a power source of first one of the switching circuits, the switching period being varied in a zone in which an input voltage is higher than a predetermined voltage in a cycle of input voltage waveform. Any distortion of input current waveform occurring around lower voltage period of commercial AC source is thereby reduced, in the power source device wherein the power conversion switching circuits employ commonly the switching elements.