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Guru_Prasad
Moderator
Moderator 100 replies posted First question asked 10 likes received
Moderator

Do thyristor discs include protection functions? (BoD and dv/dt protection)

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Guru_Prasad
Moderator
Moderator 100 replies posted First question asked 10 likes received
Moderator

Hello Guru

Thanks for posting your question in the Infineon community 

(dv/dt)critical is the maximum value for the rate of rising of a voltage applied in a forward direction running almost

linearly from 0% to 67% of VDRM at which a thyristor will not switch to the on-state. For an exponential rate of

voltage rise it is a line which crosses the exponential function starting from 0% to 63% of the maximum value.


It applies for open trigger circuit and maximum permissible junction temperature. Exceeding (dv/dt)critical may

cause destruction.

Exception: Aside from the over-voltage protection (BOD) light triggered thyristors have an integrated dv/dt

protection. This causes the thyristors to trigger safely over the entire gate structure when the dv/dt gets to high.

LTTs have the advantage of electrically isolated triggering by fiber optic links. In addition, the modern LTTs provide

integrated protection functions like overvoltage protection (Break over Diode, BoD), dv/dt protection and Forward Recovery Protection (FRP).

Thank you

Guru

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Guru_Prasad
Moderator
Moderator 100 replies posted First question asked 10 likes received
Moderator

Hello Guru

Thanks for posting your question in the Infineon community 

(dv/dt)critical is the maximum value for the rate of rising of a voltage applied in a forward direction running almost

linearly from 0% to 67% of VDRM at which a thyristor will not switch to the on-state. For an exponential rate of

voltage rise it is a line which crosses the exponential function starting from 0% to 63% of the maximum value.


It applies for open trigger circuit and maximum permissible junction temperature. Exceeding (dv/dt)critical may

cause destruction.

Exception: Aside from the over-voltage protection (BOD) light triggered thyristors have an integrated dv/dt

protection. This causes the thyristors to trigger safely over the entire gate structure when the dv/dt gets to high.

LTTs have the advantage of electrically isolated triggering by fiber optic links. In addition, the modern LTTs provide

integrated protection functions like overvoltage protection (Break over Diode, BoD), dv/dt protection and Forward Recovery Protection (FRP).

Thank you

Guru