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. 15, 1981
Filed:
Jan. 23, 1980
Hisakatsu Kiwaki, Katsuta, JP;
Kyozo Tachibana, Kamikashiomachi, JP;
Yoshimitsu Onoda, Katsuta, JP;
Katsuaki Suzuki, Kitaibaraki, JP;
Tatsuo Horie, Mito, JP;
Yutaka Suzuki, Hitachi, JP;
Shozuchi Miura, Hitachi, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
The two secondary windings of a transformer the primary winding of which is connected to an AC power supply are each provided with a controlled rectifying circuit. The DC sides of the rectifying circuits are connected in series to supply power to DC motors. One of the secondary windings is detachably connected with a capacitor bank. The capacity of the capacitor bank is selected so that the power factor of the converter can be improved to a satisfactory value when the two rectifying circuits are both controlled to produce output voltages. The capacitor bank becomes connected in response to the fact that the current in the primary winding of a transformer has arrived at a predetermined value.