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Power Electronics

Power Electronics
If holding current of a thyristor is 2 mA then latching current should be

 0.009 A.
 0.002 A.
 0.01 A.
  0.004 A.

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Power Electronics
Example of a voltage clamping device

 snubber circuit.
 aluminium block.
 fast acting fuse.
  metal oxide varistor.

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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?

 3.2 µs
 3.1 µs
 3 µs.
  3.3 µs

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Power Electronics
Let of a thyristor Vc1, Vc2, Vc3 are forward break over voltage for gate current Ig1, Ig2, Ig3 respectively. Then

 Vc1 > Vc2 > Vc3 when Ig1= Ig2
 Vc1 > Vc2 > Vc3 when Ig1 > Ig2 > Ig3.
 Vc1 = Vc2 = Vc3 any value of Ig.
  Vc1 > Vc2 > Vc3 when Ig1 < Ig2 < Ig3.

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Power Electronics
A step up chopper has input voltage 110 V and output voltage 150 V. The value of duty cycle is

  0.67.
  0.45.
  0.27.
  0.32.

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Power Electronics
Which of the following is used in SCR to protect from high dV / dt?

  Snubber circuit.
 Equalizing circuit.
 Fuse.
 Circuit breaker.

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