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:
Dec. 28, 1993
Filed:
Feb. 26, 1992
Shigeru Tanaka, Tokyo, JP;
Kazutoshi Miura, Tokyo, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
A power inverter control device is designed to control a neutral point clamped power inverter apparatus including first to fourth self-extinction elements sequentially connected in series between two end terminals of a power supply having an intermediate terminal, four freewheeling diodes connected in parallel with the self-extinction elements in a direction opposite thereto, a series circuit of first and second clamping diodes, connected in parallel with a series circuit of the second and third self-extinction elements in a direction opposite thereto and having a node connected to the intermediate terminal of the power supply. The control device includes a circuit for generating a first PWM control signal having a pulse width corresponding to a load current, and a PWM control circuit for converting the first PWM control signal into a second PWM control signal having a pulse width equivalent to the sum of the pulse width of the first PWM control signal and a width corresponding to one of turn-on and turn-off periods of each of the self-extinction element, and supplying the second PWM control signal to the first to fourth self-extinction elements.