Applications of Zener DiodePublished on 24/2/2012 & updated on 12/8/2018
Voltage references determine the constant supply of power, current or voltage as the zener voltage works if the supply of current is constant. That’s why to avoid unstable performance, zener diodes are used where voltage reference is required like ohmmeters, ammeters and voltmeters.
Zener Diode as Voltage RegulatorThe term regulator means which regulates or controls. Zener diode can work as a voltage regulator if it is introduced in a circuit. The output across the diode will be constant. It is driven by a current source. As we know if the voltage across the diode exceeds a certain value it would draw excessive current from the supply. The basic diagram of zener diode as voltage regulator is given below,
To limit the current through the Zener diode series resistance R is introduced whose value can be chosen from the following equation The above diagram is of a shunt regulator because the regulating element is parallel to the load. The Zener diode produce a stable reference voltage across the load which fulfills the criteria of the regulator.
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