Electric power conversion systems – Current conversion – Including automatic or integral protection means
Reexamination Certificate
2006-04-18
2006-04-18
Laxton, Gary L (Department: 2838)
Electric power conversion systems
Current conversion
Including automatic or integral protection means
Reexamination Certificate
active
07031172
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 I1and is lower than the level of a second reference value I2, a zero vector to be started from an OOO state in which an intermediate potential is output for all of phases is output (Step22). 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 I2and is lower than the level of a third reference value I3, a base block operation for bringing all of switching units into an OFF state is carried out after outputting the zero vector (Step28). If the current value I is equal to or greater than the third reference value I3, an emergency stop is carried out (Step29). 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.
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Tanaka Yoshiyuki
Watanabe Eiji
Yamanaka Katsutoshi
Kabushiki Kaisha Yaskawa Denki
Laxton Gary L
Sughrue & Mion, PLLC
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