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:
May. 14, 2024
Filed:
Apr. 16, 2020
Hitachi Industrial Equipment Systems Co., Ltd., Tokyo, JP;
Mizuki Nakahara, Tokyo, JP;
Hirooki Tokoi, Tokyo, JP;
Kimihisa Furukawa, Tokyo, JP;
Yuki Kawaguchi, Tokyo, JP;
Hitachi Industrial Equipment Systems Co., Ltd., Tokyo, JP;
Abstract
A power conversion device and a press apparatus capable of preventing an excessive current in a DC-link capacitor are provided. The power conversion deviceincludes a voltage-doubling rectifier circuit. In the voltage-doubling rectifier circuit, in a voltage-doubling rectification mode, a common connection node Nc between two capacitorsandis connected to a predetermined node. A current detector circuitdetects a switching current (IL) flowing in the switching elements SWand SW, and a current detector circuitdetects a load current Ild of a load. In a mode switching period from a full-wave rectification mode to a voltage-doubling rectification mode, a controller circuitcontrols the switching of the switching elements SWand SW, based on the switching current (IL) and the load current Ild.