✔ How Zener Diode Work As Regulator

How Zener Diode Work As Regulator

- May 11, 2018

A series resistancer is placed between a higher voltagev in and it is used to limit the current to the load and zener diode. 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.

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A regular diode will not work effectively as a zener diodeand vice versa.

How zener diode work as regulator. The usp of a zener diode is that it conducts current in both directions but what is so unique or special about that. A voltage regulator circuit can be designed using a zener diode to maintain a constant dc output voltage across the load in spite of variations in the input voltage or changes in the load current. Zener diode is a special type of pn junction diode that work in breakdown region.

The exciting part of this diode is that we can choose the zener diode with a suitable breakdown voltage to work as a voltage regulator in our circuit. For example we want that the voltage across a load in our circuit does not exceed lets say 12 volts. But when it is reverse biased above a certain voltage known as zener breakdown voltage or zener voltage or avalanche point or zener knee voltage the voltage remains constant for a wide range of current.

Zener diode as voltage regulator. 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. 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.

Zener diode is a general purpose diode which behaves like a normal diode when forward biased. A simple circuit involving zener diode as a regulator requires a resistor of low value connected in series with the input voltage source. A zener diode is always operated in its reverse biased condition.

The low value is required so as to allow the maximum flow of current through the diode connected in parallel. How does zener diode work as voltage regulator. The stabilized output voltage is always selected to be the same as the breakdown voltage vz of the diode.

The zener diode compensates for the variation in load current. There are two types of brekdowns in zener ie avlanche breakdown and zener breakdown depending on the doping. The diodes used as voltage regulators are called zener diodes.

A zener diode is a special type of diode that lies at the heart of voltage regulators and circuits generating the reference voltage for a differential amplifier.

Zener Diode Voltage Regulator Electronics Post