H - Electricity – 02 – M
Patent
H - Electricity
02
M
335/2, 342/34, 3
H02M 7/525 (2006.01) H02H 7/122 (2006.01) H02M 7/527 (2006.01) H02M 1/00 (2006.01)
Patent
CA 1249642
ABSTRACT OF THE DISCLOSURE An inverter using gate turn-off thyristors (GTOs) is controlled by means of pulse width modulation (PWM) to control the speed of an induction motor. If the current flowing through the induction motor becomes an overcurrent which can still be cut off by the GTOs, a gate off signal is supplied to respective GTOs to interrupt the overcurrent. If any one of arms re- spectively corresponding to phases is short-circuited, a gate on signal is supplied to all GTOs to distribute the short circuit current among the arms, and the main circuit is interrupted by a high-speed breaker. At this time, a simultaneous gate on signal is given priority. If the simultaneous gate on signal is present, a simultaneous gate off signal is disabled. Owing to this configuration, destruction of the GTOs due to consecutive guard operation can be prevented.
500303
Horie Akira
Okamatsu Shigetoshi
Hitachi Ltd.
Kirby Eades Gale Baker
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