H - Electricity – 02 – M
Patent
H - Electricity
02
M
328/114, 321/28,
H02M 1/092 (2006.01)
Patent
CA 1269725
ABSTRACT OF THE DISCLOSURE In a gate pulse generator for a thyristor converter of the type in which in order to fire thyristors of the thyristor converter in which each arm is comprised of a plurality of series-connected thyristors, the gate pulses are generated in response to the gate command signal and the thyristor forward voltage signal and are converted into the light signals which in turn are transmitted to the thyristor converter, whether or not the forward voltage signal exists when the gate command signal is generated is detected and when the forward voltage signal is generated prior to the generation of the gate command signal, the pulse duration is narrowed to a minimum required for firing the thyristor. When the forward voltage signal is generated during the time interval in which the gate command signal continues, the differences in time point when the forward voltage signals are generated among the thyristors due to the storage carrier differences therebetween are taken into consideration so that the pulse duration is increased. Therefore, from the standpoint of the frequency of occurrence, the thyristors can be fired in response to the pulse signal with a narrow pulse duration in almost all cases.
550752
Fetherstonhaugh & Co.
Kabushiki Kaisha Toshiba
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