NTA-NET (UGC-NET) Electronic Science (88) Power Devices-SCR Triggering Study Material (Page 1 of 1)

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SCR Turn-On Methods

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Turn ON method also known as triggering. With anode positive with respect to cathode, a thyristor can be turned ON by following techniques:

  • Forward voltage triggering
  • Gate triggering
  • triggering
  • temperature triggering and Light triggering.

Thermal

During forward blocking, most of the applied voltage is applied across…

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SCR Turn-Off Methods

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The process of turning off thyristor is called as Commutation. The basic methods are current commutation and voltage commutation. A thyristor can be turned on by applying a positive voltage about a volt and or a current of a few tens of milliamps at the gate cathode terminals. But SCR cannot be turned off via gate terminal. It will be turned off only after the anode current reduced below holding current naturally or by forced commutation techniques. Thus, thyristor commutati…

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