A zener diode is a pn junction that has been specially made to have a reverse voltage breakdown at a specific voltage. You can also download free interactive ebook written by me from my we. A simple circuit involving zener diode as a regulator requires a resistor of low value connected in series with the input voltage source. In this video, i have discussed zener diode and its application as a voltage regulator. This page describes the voltage regulator with the use of zener diode with its constructional details and working principle. As shown in the figure below, the collector and emitter terminals of the transistor are in series with the. Zener diode as voltage regulator tutorial basic electronics tutorials. The zener diode working principles and its various. Electronics tutorial about the zener diode and how the zener diode can be used with a series resistor to produce a zener diode voltage regulator circuit. It allows the current to flow as like a normal pn junction diode when it is forward biased and block the reverse flow of current during the reverse bias up to the breakdown voltage. A zener diode is a diode designed to operate in the breakdown region. Nz3f2v4t1 zener diode voltage regulators on semiconductor. 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. These conditions destroy normal diodes, but a zener conducts a small amount of current.
It maintains a constant voltage across the device, so it is typically employed as a simple voltage regulator in many circuits. 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. Building a voltage regulator with an ideal zener diode, construction of a voltage regulator is easy, simply connect the diode between the unregulated voltage and ground. Career point cares zener diodes can be found in several applications. 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, resistor, variable dc power supply, milliammeter. Zener diode is a special purpose pn junction diode, which operates under reverse biased condition. A zener diode is a diode that breaks down at a specific voltage when it is reverse biased. Zener diodes are rated by their breakdown voltage v z and maximum power p z typically 400mw or 1. The stabilised output voltage is always selected to be the same as the breakdown voltage v z of the diode. Zener diode as voltage regulator with numerical youtube. Zener diodes as voltage regulators a circuit diagram symbol for a zener diode. Zener diodes design support tools available features silicon planar power zener diodes for use in stablilizing and clipping circuits with high power rating standard zener voltage tolerance is 5 % these diodes are also available in the do41 case with type designation 1n4728a to 1n4764a aecq101 qualified. The low value is required so as to allow the maximum flow of current through the diode, connected in parallel.
Zener diodes are used in circuits to maintain a fixed voltage across a load. Pdf performance of shunt voltage regulators based on zener. The zener diode is a type of diode which operates under the reverse bias that breakdowns when the applied voltage reaches a particular reverse bias voltage or knee voltage. Zener diode as voltage regulator with numerical study buddy.
608 906 1660 933 18 561 84 357 185 1227 686 626 1245 1030 849 833 1234 194 496 428 472 328 907 784 1058 1 791 1013 1163 1455