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. 13, 2025
Filed:
Jul. 07, 2021
Tmeic Corporation, Chuo-ku, JP;
Kouki Morisaki, Tokyo, JP;
Haiqing Li, Tokyo, JP;
TMEIC Corporation, Chuo-ku, JP;
Abstract
A power conversion device with a three-level TNPP circuit, includes: a voltage detection unit; a test pulse output unit that outputs a test pulse to an inner switching device connected in a forward direction from the DC neutral point to an AC output terminal when the voltages detected by the voltage detection unit rise and exceed a predetermined threshold; and a determination unit that determines, when the test pulse output unit outputs a test pulse to the inner switching device connected in the forward direction from the DC neutral point to the AC output terminal, upon drop in the voltage between the DC neutral point and the DC negative electrode detected by the voltage detection unit, that an outer switching device connected to the DC negative electrode has a short circuit failure.