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 is a special purpose pn junction diode, which operates under reverse biased condition. Pdf performance of shunt voltage regulators based on zener. Nz3f2v4t1 zener diode voltage regulators on semiconductor. 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. A zener diode is a diode designed to operate in the breakdown region. To construct a zener diode voltage regulator and measure its line and load regulation. Zener diodes as voltage regulators a circuit diagram symbol for a zener diode. Zener diode as voltage regulator with numerical study buddy.
This page describes the voltage regulator with the use of zener diode with its constructional details and working principle. A simple circuit involving zener diode as a regulator requires a resistor of low value connected in series with the input voltage source. Career point cares zener diodes can be found in several applications. Zener diode as voltage regulator with numerical youtube. As shown in the figure below, the collector and emitter terminals of the transistor are in series with the. Zener diodes are rated by their breakdown voltage v z and maximum power p z typically 400mw or 1.
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. The low value is required so as to allow the maximum flow of current through the diode, connected in parallel. 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. Zener diode is a general purpose diode, which behaves like a normal diode when forward biased. 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. 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.
In this video, i have discussed zener diode and its application as a voltage regulator. These conditions destroy normal diodes, but a zener conducts a small amount of current. The stabilised output voltage is always selected to be the same as the breakdown voltage v z of the diode. Zener diode as a voltage regulator working principles. Zener diode, resistor, variable dc power supply, milliammeter. 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. The zener diode working principles and its various. Zener diode as a voltage regulator working principles byjus. A zener diode is a diode that breaks down at a specific voltage when it is reverse biased. Since the exploited property of zener diodes is the reverse breakdown voltage, connect the anode of the diode to ground, not the cathode.
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