Thyristor firing system

Details Thyristor firing system Thyristor firing system

G - Physics

05

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323/10

G05F 1/44 (2006.01) H03K 17/04 (2006.01) H03K 17/10 (2006.01) H03K 17/79 (2006.01)

Patent

CA 1273057

THYRISTOR FIRING SYSTEM Abstract of the Disclosure A firing system for simultaneously firing or gating on several thyristors arranged in a series configuration across a high voltage, requires no isolation pulse transformers to provide pulses to fire the thyristors. A transformer having a primary winding connected to an external AC source and a secondary connected to a rectifier which provides power to the firing system, provides isolation. A power semiconductor switching device is connected between the rectifier and the gate electrode of the respective thyristor. The power semiconductor switching device also has a gate electrode. A fibre optic receiver for each thyristor receives a light pulse which represents the firing signal and provides a signal to circuitry connecting with the gate electrode of the power semiconductor to cause it to conduct and provide a firing pulse to the gate electrode of the respective thyristor.

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