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US 4,084,221 AGranted
High-voltage thyristor converter
AssigneeHitachi, Ltd.
InventorFumio Ogata
Life of this patent
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AssigneeHitachi, Ltd.
InventorFumio Ogata
Estimating the term…
A high-voltage thyristor converter having a plurality of series-connected thyristor units and a gate control system. Each of the series-connected thyristor units has a plurality of series-connected thyristors and a gate-drive power supply circuit (hereinafter referred to as a gate power supply) connected between both extreme ends of the series-connected thyristors for supplying gate-drive power to the thyristors. The gate control system detects whether or not an output voltage of the gate power supply of at least one of the series-connected thyristor units is at least equal to or higher than a predetermined value and transmits a gate signal simultaneously to all of the thyristors when the output voltage is higher than the predetermined value, so that a protective action for preventing breakdown of the thyristors can be performed upon an instantaneous power failure or the like trouble.
A high-voltage thyristor converter comprising high-voltage converter means and gate control means, said high-voltage converter means including a plurality of series-connected thyristor units, each of said thyristor units having a plurality of series-connected thyristors and a gate-drive power supply circuit connected between both extreme ends of said series-connected thyristors for supplying gate-drive power to said thyristors, said gate control means detecting whether or not an output voltage of said gate-drive power supply circuit in at least one of said thyristor units is higher than a predetermined value and transmitting a gate signal simultaneously to all of said thyristors only when said detected output voltage of said power supply circuit is higher than said predetermined value.
A high-voltage thyristor converter comprising high-voltage converter means and gate control means, said high-voltage converter means including a plurality of series-connected thyristor units, each of said thyristor units having a plurality of series-connected thyristors and a gate-drive power supply circuit connected between both extreme ends of said series-connected thyristors for supplying gate-drive power to said thyristors, said gate control means detecting whether or not an output voltage of said gate-drive power supply circuit in at least one of said thyristor units is at least equal to a predetermined value and transmitting a gate signal simultaneously to all of said thyristors only when said detected output voltage of said power supply circuit is at least equal to said predetermined value.
Dependencies are inferred from the claim text.