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:
Sep. 23, 1997
Filed:
Mar. 06, 1996
Akihiko Maezawa, Kanagawa-ken, JP;
Takeshi Yoshioka, Kanagawa-ken, JP;
Ebara Corporation, Tokyo, JP;
Abstract
Three-phase alternating-current electric energy supplied from a primary power supply is supplied to first and second six-phase transformer-coupled rectifying circuits which are connected in cascade to each other. The first six-phase transformer-coupled rectifying circuit comprises three primary windings connected in delta, and the second six-phase transformer-coupled rectifying circuit comprises three primary windings connected in star, for producing respective output voltages which are .pi./6 out of phase with each other. The first and second six-phase transformer-coupled rectifying circuits, which are connected in cascade to each other, jointly provide a twelve-phase rectifying circuit which produces a reduced harmonic or ripple current in its output energy as compared with a six-phase transformer-coupled rectifying circuit. The two six-phase transformer-coupled rectifying circuits share a voltage applied to the power supply device, and hence may have lower requirements for withstanding a breakdown voltage.