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Anonymous Poster

Thyristor

10/27/2010 10:21 AM

Lets take one isolated thyristor and one IGBT...which are separetly triggered by gate and are in ON state...

Now all of a sudden if gate circuit is open or gate pulses are stopped ..what will happen will those two ...will they conduct are does not conduct
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JRaef
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#1

Re: Thyristor

10/27/2010 10:47 AM

Too vague... too many "ifs"

In AC:

Thyristor will conduct until the next zero-cross of the current sine wave.

IGBT should not have been used on AC, but would cease conducting immediately, then probably fail due to high dv/dt.

In DC:

Thyristor (assuming it is not a GTO) would never shut off until the LOAD current is interruoted, i.e. some other switching device in the circuit, or the power polarity is reversed. A GTO Thyristor would cease to conduct only if the Gate signal polarity was reversed, not just turned off.

IGBT would cease to conduct immediately.

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Anonymous Poster
#2
In reply to #1

Re: Thyristor

10/27/2010 10:51 AM

Thanks for GA, but what is 'GTO' ?
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JRaef
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United States - Member - New Member Engineering Fields - Power Engineering - New Member

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Location: California, USA, where the Godless live next door to God.
Posts: 4665
Good Answers: 804
#3
In reply to #2

Re: Thyristor

10/27/2010 1:11 PM

Gate Turn Off

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