Circuit arrangement for protecting thyristors

Details Circuit arrangement for protecting thyristors Circuit arrangement for protecting thyristors

H - Electricity

02

M

321/91

H02M 7/155 (2006.01) H02H 3/26 (2006.01) H02H 7/20 (2006.01) H02M 1/088 (2006.01) H02M 1/096 (2006.01) H03K 17/10 (2006.01)

Patent

CA 1054218

Abstract of the Disclosure The invention relates to a circuit for protecting a plurality of series-connected thyristors against spontaneous ignition resulting from inadequate release time. For the purpose of individual protection, a device producing a switching signal when the voltage becomes negative is associated with each thyristor. This switching signal is transferred to an evaluating device. This produces a time signal for a monitoring period corresponding to the period of protection of the thyristor. A second switching signal is produced when the voltage becomes positive. When this second stitching signal occurs during the said monitoring period, the ignition circuit is triggered.

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