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:
Sep. 01, 2026
Filed:
Jun. 21, 2022
Kyosan Electric Mfg. Co., Ltd., Yokohama, JP;
Itsuo Yuzurihara, Yokohama, JP;
Tomohiro Yoneyama, Yokohama, JP;
Shohei Kobayashi, Yokohama, JP;
Yu Hosoyamada, Yokohama, JP;
KYOSAN ELECTRIC MFG. CO., LTD., Yokohama, JP;
Abstract
A pulse width modulation control according to the present invention is performed such that, when changing a modulation rate of a modulation wave, the modulation rate is continuously changed from a normal modulation region to an overmodulation region, and, the modulation rate is controlled not to be discontinuous between the normal modulation region and the overmodulation region. In the overmodulation region, limiting the modulation rate α prevents a jump phenomenon in pulse width from occurring and the continuity of the pulse width from disappearing due to the jump phenomenon. The upper limit αof the modulation rate α is a threshold at which the pulse width of a PWM pulse signal jumps to a duty ratio of 50%, and limits the modulation rate α to less than the threshold.