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:
Nov. 06, 2018
Filed:
Jun. 15, 2015
Toshiba Mitsubishi-electric Industrial Systems Corporation, Chuo-ku, JP;
Taichiro Tsuchiya, Chuo-ku, JP;
Abstract
An MMC includes arms each configured with one unit converter or a plurality of cells connected in series. A control circuit of the cell transmits a voltage detected value of a DC capacitor to a control device and controls on/off of a switching element in accordance with a control signal received from the control device. When the voltage detected value of at least one cell exceeds a first threshold voltage, the control device transmits a gate block signal to the control circuit of each cell. The control circuit of each cell autonomously fixes the switching element of its own main circuit to an off state and short-circuits the output terminals of the main circuit, irrespective of the control signal, when its own voltage detected value exceeds a second threshold voltage higher than the first threshold voltage.