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:
Feb. 08, 2022
Filed:
Nov. 14, 2018
Rohm Co., Ltd., Kyoto, JP;
Rohm Co., Ltd., Kyoto, JP;
Abstract
AC power supply deviceincludes input capacitorsandconnected at a neutral point X of a three-phase output, transistor bridges* (where * denotes U, V, and/or W) each consisting of PWM control badgesandeach including two switch elements, transformers T* connected to output terminals of the transistor bridges*, reactors Ls* connected to the transformers T*, smoothing capacitors* connected to the reactors Ls*. The transformers T* are autotransformers including a core* and windings* and* coupled with each other via the core*. One ends of the windings are connected to output terminals of the PWM control bridgesand, respectively, while the other terminals are connected to the reactors Ls*. The windings* and* are wound in such directions that magnetic fluxes generated in the core* are cancelled with each other.