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:
Jan. 05, 2016
Filed:
Jul. 02, 2014
Central Japan Railway Company, Aichi, JP;
Fuji Electric Co., Ltd., Kawasaki-shi, JP;
Tadashi Sawada, Saitama, JP;
Toshiaki Murai, Tokyo, JP;
Yoshiyasu Hagiwara, Kanagawa, JP;
Masayuki Tobikawa, Kanagawa, JP;
Ayako Saga, Tokyo, JP;
Tomotaka Nishijima, Hyogo, JP;
Toshiya Kaneko, Hyogo, JP;
CENTRAL JAPAN RAILWAY COMPANY, Nagoya-Shi, JP;
FUJI ELECTRIC CO., LTD., Kawasaki-Shi, JP;
Abstract
In a power supply device, the bridge circuit including a plurality of switching arms which is an inverse-parallel circuit of a semiconductor switch and a diode. The power supply device includes a control unit. The control unit switches the semiconductor switch such that a voltage v between AC terminals becomes a positive-negative voltage whose peak value is the voltage Vbetween the DC terminals only during prescribed time periods before and after a point that has deviated from each zero crossing point ZCP of a current i by a prescribed compensation period φ and such that the voltage v between the AC terminals becomes a zero voltage during the other time periods, and sets the compensation period φ such that a time period during which the voltage v between the AC terminals becomes a zero voltage is the shortest.