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. 27, 1997
Filed:
May. 15, 1996
Shigeru Tanaka, Tokyo, JP;
Kazutoshi Miura, Tokyo, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
A control system for a pulse-width modulation controlled power converter composed of self-turn-off devices. The control system includes a voltage command value generator for the power converter, a carrier wave generator and a circuit for correcting at least one of the voltage command value and the frequency of the carrier wave to generate as a corrected voltage command value and a corrected carrier wave. The control system further includes a gate pulse signal generator for receiving a first signal and a second signal and for comparing the first and second signals to generate gate pulse signals to the self-turn-off devices for controlling the power converter based on a comparison result. The voltage command value is taken as e (-1.ltoreq.e.ltoreq.+1), and a level setting value is taken as E.sub.a (0<E.sub.a <1). The gate pulse signal generator receives the voltage command value and the carrier wave as the first and second signals when -E.sub.a .ltoreq.e.ltoreq.+E.sub.a. The gate pulse signal generator receives one of the voltage command value and the corrected voltage command value as the first signal and one of the carrier wave and she corrected carrier wave as the second signal when e<-E.sub.a or +E.sub.a <e.