Zener diode is a general purpose diode, which behaves like a normal diode when forward biased. 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 with numerical study buddy. 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. In this video, i have discussed zener diode and its application as a voltage regulator. A zener diode is a diode that breaks down at a specific voltage when it is reverse biased. A zener diode is a diode designed to operate in the breakdown region. Zener diode as a voltage regulator working principles byjus. 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. Zener diode as a voltage regulator working principles.
Zener diodes are rated by their breakdown voltage v z and maximum power p z typically 400mw or 1. Zener voltage regulator circuit an overview of the basics of the zener diode regulator circuits and the way in which a zener diode can be used to provide a reference voltage in. The stabilised output voltage is always selected to be the same as the breakdown voltage v z of the diode. This page describes the voltage regulator with the use of zener diode with its constructional details and working principle.
Zener diode as voltage regulator with numerical youtube. Regulator zener diode regulator for low current power supplies a simple voltage regulator can be made with a resistor and a zener diode connected in reverse. To construct a zener diode voltage regulator and measure its line and load regulation. As shown in the figure below, the collector and emitter terminals of the transistor are in series with the. You can also download free interactive ebook written by me from my we. 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. Since the exploited property of zener diodes is the reverse breakdown voltage, connect the anode of the diode to ground, not the cathode. A zener diode is a pn junction that has been specially made to have a reverse voltage breakdown at a specific voltage. 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. Nz3f2v4t1 zener diode voltage regulators on semiconductor. 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. 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. It maintains a constant voltage across the device, so it is typically employed as a simple voltage regulator in many circuits.
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. Zener diode, resistor, variable dc power supply, milliammeter. Pdf performance of shunt voltage regulators based on zener. Zener diode as voltage regulator tutorial basic electronics tutorials. These conditions destroy normal diodes, but a zener conducts a small amount of current. Zener diode as a voltage regula tor zener diode is a silicon semiconductor with a pn junction that is specifically designed to work in the reverse biased condition. Zener diodes as voltage regulators a circuit diagram symbol for a zener diode. Zener diode is a special purpose pn junction diode, which operates under reverse biased condition.
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