H - Electricity – 03 – K
Patent
H - Electricity
03
K
H03K 17/56 (2006.01)
Patent
CA 2191162
This circuit provides for a capacitor to be charged to a working level while a small current is allowed to flow through a transistor-resistor circuit which is paralleled with the gate circuitry of a thyristor. Under quiescent operating conditions when the gate circuitry is not energized, only a small current flows in the transistor-resistor circuit. Upon receipt of a turn on signal from the trigger circuit, the gate circuitry is switched on allowing the capacitor to discharge through the gate circuitry into the gate of the load thyristor. A second transistor connected into the transistor-resistor circuit allows the initial steep pulse to be transmitted to the gate, but the gate current is limited as the second transistor biases the first transistor into a state where only a limited current may pass to the thyristor gate.
Cronk Arthur Edward
Winlow David Sowden
Craig Wilson And Company
General Electric Canada Inc.
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