18 Questions
What is the number of terminals in an SCR?
3
What type of switches are TRIACs and DIACs considered as?
Bilateral Switches
How can a TRIAC be turned ON?
By a pulse of gate current
What is the main difference between an SCR and a TRIAC?
Direction of current conduction
What is the process of triggering a TRIAC when biased with an external voltage more positive on 𝐴' compared to 𝐴''?
Sending gate current from gate to 𝐴''
What is the analogy between Shockley Diode and DIAC, and SCR and TRIAC?
Shockley Diode → DIAC; SCR → TRIAC
What is the advantage of using SBS to trigger a TRIAC over using a DIAC?
It eliminates the hysteresis or flash-on effect.
What is the purpose of 𝐶# in the flash-on effect scenario?
To charge and discharge in alternate directions during the entire positive and negative half of the input signal.
What happens to the charge of 𝐶# when the TRIAC is ON?
It stops charging.
Why does the light of the lamp become brighter during the succeeding half cycles?
The TRIAC is triggered earlier during the succeeding half cycles.
What is the role of the external Zener diode in the SBS characteristic curve?
It provides a fixed voltage reference.
What type of device is the SBS?
A type of silicon bilateral switch.
What is the condition for the effective period of V!(t) in a TRIAC Phase-Control Circuit?
𝜋
What is the purpose of the gate terminal in a Silicon Bilateral Switch (SBS)?
To alter its breakover voltage in one direction
What is the typical rating for the breakover voltage (VQP) of a Silicon Bilateral Switch (SBS)?
± 8 V
What happens when the current through the anodes of a Silicon Bilateral Switch (SBS) falls below the holding current (IOP)?
It stops conducting until the next trigger
What is the characteristic of a TRIAC that allows it to conduct in both directions?
It is a bilateral breakover device
What is the purpose of a DIAC in a TRIAC Phase-Control Circuit?
To trigger the TRIAC gate
Learn about the characteristics and applications of Silicon Bilateral Switch (SBS) including its use in triggering TRIAC, eliminating hysteresis and flash-on effect.
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