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. 06, 2003
Filed:
Nov. 05, 2001
Norio Oba, Tokyo, JP;
Yuushin Yamamoto, Tokyo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
In a control circuit for a power converting apparatus, such as a three-phase inverter, unnecessary switching operations of switching elements are avoided. The control circuit includes current sensors for detecting inverter currents; a three-phase current command generating circuit for generating a current command value; adders/substracters for calculating current deviation between the current command value and the inverter current; a voltage detecting circuit for detecting voltages of three-phase power supplies; and a pulse width modulation (PWM) pattern selector circuit obtaining a current deviation vector from the current deviation, setting an allowable range region with respect to the current deviation vector, when the current deviation vector is not located within the allowable range region, obtaining a moving direction of the current deviation vector as to output voltage vectors of the power converting apparatus based upon the power supply voltage vector, and outputting an output voltage vector in which the moving direction of the current deviation vector, among moving directions, is directed to the allowable range region.