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:
Apr. 09, 2024
Filed:
Oct. 27, 2020
Hitachi Astemo, Ltd., Hitachinaka, JP;
Yasuhiro Ishikawa, Hitachinaka, JP;
Ryohichi Inada, Tokyo, JP;
Hitachi Astemo, Ltd., Hitachinaka, JP;
Abstract
A three-phase/two-phase conversion unitgenerates a composite vector iof three-phase AC currents based on AC currents iu, iv, and iw. An electrical angle calculation unitoutputs the electrical angle of the composite vector iwith reference to the U-phase AC current iu. A quadrant calculation unitobtains which quadrant of the first to sixth quadrants partitioned in advance the acquired electrical angle corresponds to, confirms whether the composite vector ipasses through the set quadrant, and outputs quadrant information thereof. A failure detection unitdetermines whether the composite vector ihas rotated from the first quadrant to the sixth quadrant, and when there is a quadrant that has not been passed, considers that it is a failure state, specifies a failure part of the switching element from the relationship between the electrical angle and the failure part, and outputs failure information to a PWM signal generation unit