✔ Explain Zener Diode As A Voltage Regulator Class 12

Explain Zener Diode As A Voltage Regulator Class 12

- November 30, 2019

Answered dec 14 by. The stabilised output voltage is always selected to be the same as the breakdown voltage v z of the diode.

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Zener diodes have a highly doped p n junction.

Explain zener diode as a voltage regulator class 12. 1 answer 1 vote. When forward biased it behaves like a normal signal diode but when the reverse voltage is applied to it the voltage remains constant for a wide range of currents. Join sarthaks econnect today largest online education community.

We have discussed the application of zener diode as voltage regulator and now we will discuss the other two points. The zener voltage regulator consists of a current limiting resistor r s connected in series with the input voltage v s with the zener diode connected in parallel with the load r l in this reverse biased condition. Zener diode as a voltage regulator zener diode is a silicon semiconductor with a p n junction that is specifically designed to work in the reverse biased condition.

The output voltage of regulator system is fixed as the zener knee voltage of the zener diode and can be used in power devices requiring a fixed voltage of firm value. Explain its use as a voltage regulator. This circuit provides safety for the equipment connected at the terminals.

Working of zener voltage regulator. The input voltage vin is an unregulated dc voltage which is obtained from a rectifier filter combination. Zener diode is connected in parallel with the load resistance.

Zener diode example no1. Zener diodes are normal pn junction diodes operating in a reverse biased condition. Zener diode as a voltage regulator.

Share it on facebook twitter email. What is zener diode. Over voltage protection is done by using zener diodes because there is current flowing through the diode after the reverse bias voltage exceeds a certain voltage.

The zener diode regulator as shown in figa is a shunt type voltage regulator because the control element ie. The zener diode will continue in regulating the voltage till the zener diode current falls below the minimum i z min value in the reverse breakdown region. In breakdown the voltage across the zener diode is close to constant over a wide range of currents thus making it useful as a shunt voltage regulator.

The purpose of a voltage regulator is to maintain a constant voltage across a load regardless of variations in the applied input voltage and variations in the load current. Working of the zener diode is similar to a pn junction diode in forward biased condition but the uniqueness lies in the fact that it can also conduct when it is connected in reverse bias above its threshold breakdown voltage. Normal diodes will also break down with a reverse voltage but the voltage and sharpness of the knee are not as well defined as for a zener diode.