The thyristor, being a multiple (three) bipolar junction device, is essentially a current-controlled device. As illustrated in figure 7.1a, a current must be supplied between the gate and cathode terminals to produce cathode injection, hence anode current flow, provided the anode is forward biased. The magnitude of gate drive current determines the delay time and the anode current rise time. In gate commutated thyristors, a negative gate current must be produced, themagnitude determining the turn-off delay time and anode current fall time.
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