✔ How Zener Diode Act As A Voltage Regulator

How Zener Diode Act As A Voltage Regulator

- July 15, 2017

I v characteristics of zener diode make it. This type of arrangement of the circuit provides safety for equipment connected to terminals.

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A typical zener diode shunt regulator is shown in figure 3.

How zener diode act as a voltage regulator. Lets take the value of r 2 as 1kw. The zener diode compensates for the variation in load current. 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.

The key in using the zener diode as voltage regulator is that as long as the zener diode is reverse biased the flow of current greater than a few micro amperes must be accompanied by a voltage greater than the zener voltage. A regular diode will not work effectively as a zener diodeand vice versa. The zener voltage regulator consists of a current limiting resistor rs connected in series with the input voltage vs with the zener diode connected in parallel with the load rl in this reverse biased condition.

The stabilized output voltage is always selected to be the same as the breakdown voltage vz of the diode. A series resistancer is placed between a higher voltagev in and it is used to limit the current to the load and zener diode. Zener diode is the simplest types of voltage regulator and the point at which a zener diode breaks down or conducts is called the zener voltage vz.

Zener diode is somewhat similar to the ordinary p n junction diode but with an outstanding property of sharp breakdown voltage. When we connect zener diode in forword biased condition it works similar to the ordinary diode. This property enables to use it as a voltage regulator.

Design for an op amp voltage regulator circuit to drive a load of 6v12w from an input supply of 12v with a 2v ripple voltage using a 3v zener diode. Refer to the voltage reference circuit to set the resistance r 1. The diodes used as voltage regulators are called zener diodes.