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Chapter 11: Problem 6

An SCR can be tumed off by (a) forced cominutation (b) a negative polse on the gate (c) anode curicnt intcrmpticn (d) unswers (a), (b), and (c) (e) answers (a) mral (c)

Short Answer

Expert verified
The correct answer for turning off an SCR is option (e): forced commutation and anode current interruption.

Step by step solution

01

Understand SCR Operation

An SCR is a four-layer semiconductor device with three terminals: anode, cathode, and gate. It works as a switch and conducts current between anode and cathode once a positive gate pulse is applied and continues to allow current until the applied voltage falls below the holding voltage.
02

Option (a): Forced Commutation

Forced commutation involves turning off the SCR by momentarily applying a reverse voltage across the anode and cathode, which reduces the anode current below the holding current. This method indeed turns off the SCR. Thus, option (a) is correct.
03

Option (b): A Negative Pulse on the Gate

Applying a negative pulse to the gate will not turn off the SCR, as the gate is only responsible for turning the SCR on. Once the SCR is turned on, it remains on regardless of any negative gate pulses. Thus, option (b) is not correct.
04

Option (c): Anode Current Interruption

By interrupting the anode current, the SCR will be turned off, as the anode current then drops below the holding current value. This can be done by opening the circuit or reducing the supply voltage. Thus, option (c) is correct.
05

Option (d): Answers (a), (b), and (c)

Based on our previous analysis, both options (a) and (c) are correct methods for turning off an SCR, while option (b) is not. Therefore, option (d) cannot be the correct answer.
06

Option (e): Answers (a) and (c)

As we have established that options (a) and (c) are both correct methods for turning off an SCR, this means that option (e) is the correct answer. Hence, the correct answer to the question of which methods can be used to turn off an SCR is option (e): forced commutation and anode current interruption.

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