To keep the output voltage constant at the desired value in spite of variations in the supply voltage. It is a system wherein a constant voltage level is maintained either using positive feedback or negative feedback. The output voltage of regulator system is fixed as the zener knee voltage of the zener diode and can be used in power devices requiring a fixed voltage of firm value. As the breakdown voltage is appro… 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.. Clarence Zener is the scientist who discovered this electrical property and the device is … Zener Diode as a Voltage Regulator Zener diode is a silicon semiconductor with a p-n 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. Minimum reverse current is required for voltage regulation to keep diode in the breakdown region. In this Physics video in Hindi for class 12 we explained, with diagram, how Zener diode is used as voltage regulator. you are here->home->Physics->Class 12->Zener Diode. ... Zener diode voltage regulator . The action of the circuit can be explained as given below: Load current varies, the input voltage is constant: Let us consider that the load current increases. Video. It can be understood how a zener diode acts as a voltage regulator by analyzing the below circuit. As Voltage Regulator 12. Observe the nearly constant voltage in the breakdown region. Fig 2:Zener diode characteristic curve The forward bias region of a Zener diode is identical to that of a regular diode. It is connected to the positive terminal of the d.c. The normal AC voltage, Vp = 220V(rms) and can vary +10% during charging. Due to this feature, it is used as a voltage regulator in d.c. circuit. 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. The reason behind this is, an ordinary diode may get damaged if you apply a voltage greater than its breakdown voltage in reverse bias. The voltage regulator is used for two main reasons, and they are: Voltage regulators are used in computers, power generators, alternators to control the output of the plant. Zener diode is connected parallel to the load to make it reverse bias and once the Zener diode exceeds knee voltage, the voltage across the load will become constant. At this point, a small increase in reverse voltage will rapidly increases the electric current. Function of Zener Diode in Voltage Regulator Abstract The strength property which we use may not be capable to grant us normal voltage. Zener diode is used as a Shunt voltage regulator for regulating voltage across small loads. Ans. Zener Diodes have a sharp reverse breakdown voltage and breakdown voltage will be constant for a wide rang of currents. In this video, let's explore how a Zener diode can be used to regulate voltage. To maintain a constant voltage across the load, even if the input voltage or load current varies, voltage. The reverse characteristic is obtained by taking reverse voltage along – ve X-axis and reverse current along –ve Y-axis. At this point, the current begins flowing seamlessly without any change in voltage. This may moreover have an effect on the proper functioning of the digital tool. How Zener Diode Act as a Voltage Regulator? The experiment shows that in both conditions, it acts as a voltage regulator as it allows current to flow without showing any fluctuation in output voltage. If the voltage is above a certain level, only then Zener diode will allow flowing a current in reverse direction and this required voltage for reverse current to flow in Zener diode is known as the breakdown voltage. Design a Zener diode voltage regulator circuit as shown in Fig. Hence, it acts as a voltage regulator. Learn the concepts of Class 12 Physics Semiconductor Electronics: Materials, Devices and Simple Circuits with Videos and Stories. Your email address will not be published. Zener diode helps us in making of a voltage regulator. Zener diode is connected parallel to the load to make it reverse bias and once the Zener diode exceeds knee voltage, the voltage across the load will become constant. Zener Diode as a voltage regulator. Zener diode is specifically designed for this purpose. The Zener diode is a unique sort of diode having a sharp reduce off voltage for the […] This zener diode voltage regulator circuit uses a Zener diode to establish a reference voltage. Explain, giving reason. By now we know that even if we use a rectifier to convert AC input voltage, the output fluctuates too. This silicon semiconductor is designed to function in the condition of reverse bias. This silicon semiconductor is designed to function in the condition of reverse bias. Zener Diode as a Voltage Regulator In Zener diode, there is a conventional current flow from anode to cathode. The maximum power rating P Z of the Zener diode is 2 W. Using the circuit above, calculate 1. Procedure. Read more to learn about the Zener diode as a voltage regulator, uses of a Zener diode, and how it is used as a voltage regulator with BYJU’S engaging videos. Over voltage protection is done by using Zener diodes because there is current flowing through the diode after the reverse bias voltage exceeds a certain voltage . Funded by MeitY (Ministry of Electronics & Information Technology) English हिंदी മലയാളം मराठी . Now that you have understood the working of Zener diode as voltage regulator answer a few questions based on your understanding. Ans. Class 12 Physics Semiconductor Electronics: Special purpose p-n junction diode: Special purpose p-n junction diode. The breakdown voltage of Zener diodes will be constant for a wide range of current. Observe the nearly constant voltage in the breakdown region. This semiconductor is manufactured in a wide variety of voltages and powers. Zener Diode as a voltage. We do not use ordinary junction diode because the low power rating diode can get damaged when we apply reverse bias above its breakdown voltage. Sorry!, This page is not available for now to bookmark. This is how zener diode is used as voltage regulator. This ensures that even when a load is applied the voltage doesn’t drop. We have discussed the application of Zener diode as voltage regulator and now we will discuss the other two points. Due to this feature, it is used as a voltage regulator in d.c. circuit. The maximum current flowing through the diode. Click here to visit the playlist on this chapter Video. Furthermore, choosing a Zener diode becomes easy as the required output voltage and the input voltage is known from the beginning. When reverse biased voltage applied to the zener diode reaches zener voltage, it starts allowing large amount of electric current. Let us say if Zener voltage of 5 V is used then, the voltage becomes constant at 5 V, and it does not change. The exciting part of this diode is that we can choose the Zener diode with a suitable breakdown voltage to work as a voltage regulator in our circuit. Furthermore, choosing a Zener diode becomes easy as the required output voltage and the input voltage is known from the beginning. Viva Voce. 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