In an SCR, the latching current is __________ the holding current

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VSSC (ISRO) Technician B: Electronic Mechanic Previous Year Paper (Held on 10 Dec 2017)
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  1. lower than
  2. higher than
  3. same as
  4. negative of 

Answer (Detailed Solution Below)

Option 2 : higher than
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The I-V characteristics of the thyristor are shown below.

F1 U.B Madhu 08.04.20 D7

From the above characteristics:

  • The thyristor will trigger when the applied voltage is more than the forward break over voltage
  • The latching current is always greater than the holding current
  • When reverse biased, a small leakage current will flow
  • SCR can be triggered without gate current by forward voltage triggering, dv/dt triggering, thermal triggering, and light triggering.
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