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:
Jul. 27, 1999
Filed:
Jul. 13, 1998
Kazuo Watanabe, Yokohama, JP;
Atsushi Sato, Yokohama, JP;
Kabushiki Kaisha Wacogiken, Kanagawa, JP;
Abstract
In a PWM inverter having a two-arm structure of upper and lower arms, the dead time is reduced to a minimum for improving the controlling accuracy and linearity under a very small rate of the inverter power output. Also, in the PWM control on a motor, the controlling stability at a lower speed can be increased. Particularly, an improvement for use in a PWM inverter comprises off-state detecting means, each connected to a power switching element in one of the two upper and lower arms of the PWM inverter for detecting the off-state of the switching element and gate means, each provided for receiving an off-state detection signal fed back from the off-state detecting means of the opposite arm connected to the input of corresponding one of the two switching elements and generating a turn-on signal for the other switching element.