Uses Of Zener Diode

By passing a small current through the diode from a voltage source via a suitable current limiting resistor r s the zener diode will conduct sufficient current to maintain a voltage drop of vout. Zener diodes are widely used as voltage references and as shunt regulators to regulate the voltage across small circuits.

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Zener diodes function as voltage regulators varactors are used in electronic tuning and varistors are used to suppress transients in ac lines.

Uses of zener diode. Zener diode is popularly used as shunt regulator or voltage regulator. For example if you have a 9 volt battery but need to power a 3 v hobby motor a zener diode may be used to reduce the voltage. Voltage references determine the constant supply of power current or voltage as the zener voltage works if the supply of current is constant.

The main use of zener diode lies in the fact that the voltage across a zener diode remains constant for a larger change in current. This makes it possible to use a zener diode as a constant voltage device or a voltage regulator. In a dc circuit zener diode can be used as a voltage regulator or to provide voltage reference.

The circuit diagram showing the zener diode being used as a voltage regulator is shown below. The person named clearance zener invented this property of the diode thats why it is named after him as a remembrance. It is mainly a special property of the diode rather than any special type of equipment.

The diode consists of a special heavily doped p n junction designed to conduct in the reverse direction when a certain specified voltage is reached. A popular use is as voltage regulators for low current circuits. A resistor r1 is connected in series with the zener diode to limit the amount of current flowing through the diode and the input voltage vin which must be greater than the zener voltage is connected across as shown in the image and the output voltage vout is taken across the zener diode with vout vz zener voltage.

When they are used as voltage regulators they must be combined with a current limiting diode in order to prevent their destruction. A zener diode is a silicon semiconductor device that permits current to flow in either a forward or reverse direction. Because the negative portion of an ac waveform is usually identical to the positive half very little information is effectively lost in this process of stripping it away leading to more efficient signal processing.

When connected in parallel with a variable voltage source so that it is reverse biased a zener diode conducts when the voltage reaches the diodes reverse breakdown voltage. Thats why to avoid unstable performance zener diodes are used where voltage reference is required like ohmmeters ammeters and voltmeters. Zener diodes can be used to produce a stabilised voltage output with low ripple under varying load current conditions.

Diodes are the basis of transistors and op amps. The most common use of diodes is to remove the negative component of an ac signal.

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