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:
Apr. 18, 2006
Filed:
Jun. 04, 2003
Yoshiyuki Tanaka, Fukuoka, JP;
Katsutoshi Yamanaka, Fukuoka, JP;
Eiji Watanabe, Fukuoka, JP;
Kabushiki Kaisha Yaskawa Denki, Fukuoka, JP;
Abstract
It is an object of the invention to provide a multilevel PWM inverter control apparatus capable of safely carrying out switching from a normal operation to a protecting operation and performing a reset from the protecting operation to the normal run safely and smoothly without requiring a complicated control algorithm. In the invention, if a current value I which is measured is set to have a level which is equal to or higher than the level of a first reference value Iand is lower than the level of a second reference value I, a zero vector to be started from an OOO state in which an intermediate potential is output for all of phases is output (Step). If the current value I is set to have a level which is equal to or higher than the level of the second reference value Iand is lower than the level of a third reference value I, a base block operation for bringing all of switching units into an OFF state is carried out after outputting the zero vector (Step). If the current value I is equal to or greater than the third reference value I, an emergency stop is carried out (Step). When a reset to a normal operation is carried out after the execution of the base block operation, the reset to the normal operation is performed after the execution of the operation for outputting the zero vector.