Negative gate pulse to a thyristor

Question

If a positive gate pulse is given to a forward biased thyristor, it gets turned on. What will happen when a negative gate pulse is given to a reverse biased thyristor ?

score 0 · Accepted Answer · 2015-11-11T07:29:58.097

0

Nothing... Well unless it is really really high and you get GTO like behaviour ( although the magnitude and di/dt needed to force the abnormal affect is very unlikely)

edited Nov 11 '15 at 07:29

answered Nov 11 '15 at 07:26

Could you please explain the reason. – Vedanshu Nov 11 '15 at 07:28
If the negative gatepulse is high enough it essentially removes the minority carriers from the base area of the NPN stack. This current however is higher than the fwd current and more of a physical phenomenon not something likely to occurred. – Nov 11 '15 at 07:32

score 0 · Answer 2 · edited Apr 13 '17 at 12:32

0

In normal operation of a Thyristor or SCR, nothing.

Excess voltages of dV/dt spike will eventually cause some kind of transient or permanent breakdown. Excess is a relative term and such operation is usually not desirable.

Triacs have conduction modes in the other quadrants.

Also see this similar question.

edited Apr 13 '17 at 12:32

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answered Nov 11 '15 at 07:33

KalleMP

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Negative gate pulse to a thyristor

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