Over voltage crowbar protection circuit & its components

Q.  Which among the following components is not used in an over voltage crowbar protection circuit?
- Published on 25 Sep 15

a. Resistor
b. Capacitor
c. Inductor
d. SCR

ANSWER: Inductor

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    Discussion

  • Satyawati Patil   -Posted on 06 Oct 15
    The SCR over voltage crowbar protection circuit provides an effective method of protection against the several types of power supply failure.

    It basically comprises SCR, Zener diode, resistor and capacitor. Since the power supply regulation is maintained with the usage of all these four components, there is no need of using any inductor in the circuit as it increases the change in current.

    When the Zener diode voltage is reached, current flows through Zener diode by protecting the circuit from any sort of damage due to power supply. The main functioning role of SCR is that it provides a very high current and also conducts the short current peaks.

    The role of resistor is to supply reasonable current when Zener diode gets turned ON & also to clamp the gate voltage at ground potential until the Zener diode turns ON. However, the capacitor prevents the short spikes from triggering the circuit.

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