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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?

 1000 V/µs.
 600 V/µs.
 1200 V/µs.
  800 V/µs.

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Power Electronics
BCT is used for

 High power current control.
  High power phase control.
 Low power current control.
 Low power phase control.

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Power Electronics
Which of following devices has highest di/dt and dv/dt capability?

 SIT.
 SITH.
  GTO.
 SCR.

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Power Electronics
Which of the following is disadvantage of fast recovery diodes?

 Recovery is only 50 µs.
 None of these.
  Doping is carried out.
 Recovery is only 5 µs.

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Power Electronics
A power semiconductor may undergo damage due to

 Low di/dt.
  High di/dt.
 Low dv/dt.
 High dv/dt.

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