The capacitance of reversed bised junction J2 in a thyristor is CJ2 = 20 pF and can be assumed to be independant of the off state voltage. The limiting value of the charging current to turn on the thyristor is 16 mA. What is the critical value of dv/dt?

Power Electronics
The capacitance of reversed bised junction J2 in a thyristor is CJ2 = 20 pF and can be assumed to be independant of the off state voltage. The limiting value of the charging current to turn on the thyristor is 16 mA. What is the critical value of dv/dt?

1200 V/µs.

800 V/µs.

600 V/µs.

1000 V/µs.

1200 V/µs.

800 V/µs.

600 V/µs.

1000 V/µs.

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Power Electronics
A triac has ___________ semiconductor layers.

Five

Three

Four

Two

Five

Three

Four

Two

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Power Electronics
In reverse blocking mode of a thyristor

junction J2 is in reverse bias and J1, J3 is in forward bias.

junction J1 and J2 is in forward bias and J3 is in reverse bias.

junction J1, J3 is in reverse bias and J2 is in forward bias.

junction J3 is in forward bias and J1, J2 in reverse bias.

junction J2 is in reverse bias and J1, J3 is in forward bias.

junction J1 and J2 is in forward bias and J3 is in reverse bias.

junction J1, J3 is in reverse bias and J2 is in forward bias.

junction J3 is in forward bias and J1, J2 in reverse bias.

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Power Electronics
If a latching current for the circuit shown in figure is 2 mA. Obtain the value of minimum width of the property turn ON the SCR?

3 µs.

3.1 µs

3.3 µs

3.2 µs

3 µs.

3.1 µs

3.3 µs

3.2 µs

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Power Electronics
A thyristor string is made of a no. of SCR connected in series and parallel. The string have volume and current of 11 KV and 4 KA. The voltage and current rating of available SCRs are 1800 V and 1000 A. For a string efficiency of 90 % let the number of SCRs in series and parallel are a and b respectively. Then the value of a and b will be

5, 7.

6, 4.

7, 5.

4, 6.

5, 7.

6, 4.

7, 5.

4, 6.

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Power Electronics
A triac is equivalent to two SCRs ___________.

None of these

In parallel

In inverse-parallel

In series

None of these

In parallel

In inverse-parallel

In series

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Power Electronics

Power Electronics The capacitance of reversed bised junction J2 in a thyristor is CJ2 = 20 pF and can be assumed to be independant of the off state voltage. The limiting value of the charging current to turn on the thyristor is 16 mA. What is the critical value of dv/dt?

Power Electronics A triac has ___________ semiconductor layers.

Power Electronics In reverse blocking mode of a thyristor

Power Electronics If a latching current for the circuit shown in figure is 2 mA. Obtain the value of minimum width of the property turn ON the SCR?

Power Electronics A triac is equivalent to two SCRs ___________.

Power Electronics
The capacitance of reversed bised junction J2 in a thyristor is CJ2 = 20 pF and can be assumed to be independant of the off state voltage. The limiting value of the charging current to turn on the thyristor is 16 mA. What is the critical value of dv/dt?

Power Electronics
A triac has ___________ semiconductor layers.

Power Electronics
In reverse blocking mode of a thyristor

Power Electronics
If a latching current for the circuit shown in figure is 2 mA. Obtain the value of minimum width of the property turn ON the SCR?

Power Electronics
A triac is equivalent to two SCRs ___________.