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:
Jun. 30, 2020
Filed:
May. 30, 2016
Mitsubishi Electric Corporation, Chiyoda-ku, JP;
Takeshi Horiguchi, Chiyoda-ku, JP;
Yasushi Nakayama, Chiyoda-ku, JP;
Mitsubishi Electric Corporation, Chiyoda-ku, JP;
Abstract
A voltage driver shifts a voltage on a gate as a control terminal of a power semiconductor element in response to an ON command or an OFF command. A gate voltage detector generates a detection signal of a gate-emitter voltage. A delay signal generator generates a delay signal obtained by adding a delay time to the detection signal. A subtractor generates a voltage difference signal between the detection signal and the delay signal. When the voltage difference signal exceeds a reference voltage during an operation of turning on the power semiconductor element, a short-circuit state detector detects a hard-switching fault.