A simple circuit involving Zener diode as a regulator requires a resistor of the low value connected in series with the input voltage source. This voltage is called zener voltage or breakdown voltage (Vz). Principle of zener diode. Here is a link to step by step physics experiment of Zener diode as a voltage regulator and how its made. 3 Zener diode applications. At this point, the current begins flowing seamlessly without any change in voltage. Theory. Explain, giving reason. Zener Diode as a voltage. Materials required: Battery; Rheostat; Small resistance (200 Ω) Milliammeter; Voltmeter; Key; Zener diode; Real Lab Procedure: Connections are made as shown in the circuit diagram. 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. Click here to visit the playlist on this chapter (ii)Explain with the help of a circuit diagram, the use of a Zener diode as a voltage regulator. A 5 V stabilized power supply is required to be produced from a 12 V DC power supply input source. Zener Diode. What is the Experiment to Study Zener Diodes as a Voltage Regulator? A Zener diode can limit the voltage across it, making it a voltage regulator! you are here->home->Physics->Class 12->Zener Diode. The unregulated voltage is connected through a potential divider arrangement using the rheostat. Resources. We have discussed the application of Zener diode as voltage regulator and now we will discuss the other two points. Video. The fact that the voltage across the diode in the breakdown region is almost constant turns out to be an important application of the zener diode as a voltage regulator . It essentially steps down the input voltage to the desired level and keeps it at that same level during the supply. After it attains a voltage V. , there is unrestricted current flow in the system. It maintains a constant output voltage even when input voltage V i or load current I L varies. However, this forward flow of current can be reversed if the voltage surpasses a specific value which is known as the breakdown or Zener voltage. Pro Lite, CBSE Previous Year Question Paper for Class 10, CBSE Previous Year Question Paper for Class 12. Hence, VZ = VL. Procedure. In this Physics video in Hindi for class 12 we explained, with diagram, how Zener diode is used as voltage regulator. Ans. It is a system wherein a constant voltage level is maintained either using positive feedback or negative feedback. It can be understood how a zener diode acts as a voltage regulator by analyzing the below circuit. When the minimum input voltage and the maximum load current is applied, the Zener diode current should always be minimum. regulation is to be made. 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 … We are going use it's reverse breakdown characteristics. It works in such a way the reverse-biased can also work in breakdown conditions. Fabrication – It has heavily doped p- side and n-side. By designing the regulator here means to find the values of VZ and R. Since the load voltage is to be maintained at 12 V, we will use a zener diode of zener voltage 12 V i.e., The voltage across R is to remain constant at 16 − 12 = 4 V as the load current changes from 0 to 200 mA. Why is zener diode used as a voltage regulator? To maintain a constant voltage across the load, even if the input voltage or load current varies, voltage. When reverse biased voltage applied to the zener diode reaches zener voltage, it starts allowing large amount of electric current. The primary objective of the Zener diode as a voltage regulator is to maintain a constant voltage. Zener diode as a voltage regulator: The function of a regulator is to provide a constant output voltage to a load connected in parallel with it in spite of the ripples in the supply voltage or the variation in the load current and the zener diode will continue to regulate the voltage until the diodes current falls below the minimum I Z(min) value in the reverse breakdown region. At this point, the current begins flowing seamlessly without any change in voltage. Determine the maximum supply voltage that may develop, for example a 12 V level, also ensuring that the minimum supply voltage is always = 1.5 V + Vz (the zener voltage rating). Class 12 Physics Semiconductor Electronics: Special purpose p-n junction diode: Special purpose p-n junction diode. Refer to the voltage reference circuit to set the resistance R 1. Similarly, the current through the diode decreases when the voltage across the diode tends to decrease. 6 Result The breakdown potential, also called the zener potential i.e V z ≈ 6.30V. [HOTS; Foreign 2010] Ans. Voltage Regulator Using Zener Diode Physics Astronomy Project Topics, Physics Science Fair Projects, Pyhsical Science, Astrology, Planets Solar Experiments for Kids and also Organics Physics Science ideas for CBSE, ICSE, GCSE, Middleschool, Elementary School for 5th, 6th, 7th, 8th, 9th and High School Students for the year 2016. Design a Zener diode voltage regulator circuit as shown in Fig. However, when the reverse voltages are applied, or reverse feedback is provided, a tiny leakage current is observed between the zener voltage and 0V. 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. This zener diode voltage regulator circuit uses a Zener diode to establish a reference voltage. you are here->home->Physics->Class 12->Zener Diode. Here, in this circuit the input voltage V i is regulated at a constant voltage, V z (Zener voltage) at the output represented as V 0 using a Zener diode. Design for an op-amp voltage regulator circuit to drive a load of 6V,1.2W from an Input supply of 12V with a ±2V ripple voltage, using a 3V zener diode. This silicon semiconductor is designed to function in the condition of reverse bias. Zener Diode Voltage Regulators S Bharadwaj Reddy June 3, 2017 December 12, 2018 Zener Diodes can be used to produce a stabilised voltage output with low ripple under varying load current conditions. The reverse characteristic is obtained by taking reverse voltage along – ve … ... Zener diode voltage regulator . This silicon semiconductor is designed to function in the condition of reverse bias. The Figure shows the fuction of zener diode as voltage regulator.The diode is selected in such a way that its breakdown voltage is equal to the desired output voltage. Our mission is to provide a free, world-class education to anyone, anywhere. A voltage regulator is a device that regulates the voltage level. The low value is required so as to allow the maximum flow of current through the diode, connected in parallel. Zener diodes are widely used as voltage references and as shunt regulators to regulate the voltage across small circuits. The battery is charging with a constant current 20mA. 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. Hence, it acts as a voltage regulator. When the breakdown occurs in Rectifier as well as Zener diode, it is known as Zener breakdown. 1. Before you discuss how this diode can be used as a voltage regulator, you must know what a voltage regulator is. Thus we will connect the zener diode parallel to the load such that the applied voltage will reverse bias it. Wir erinnern uns aus den vorangegangenen Tutorials, dass die … Zener diode as a voltage regulator. In breakdown the voltage across the Zener diode is close to constant over a wide range of currents thus making it useful as a shunt voltage regulator. The normal AC voltage, Vp = 220V(rms) and can vary +10% during charging. 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