(iii)A photo diode is operated under reverse bias although in the forward bias, the current is known to be more than the current in the reverse bias. Now that you have understood the working of Zener diode as voltage regulator answer a few questions based on your understanding. Zener diode is used as a Shunt voltage regulator for regulating voltage across small loads. Feedback. regulation is to be made. When the Zener diode is given reverse bias feedback, there is a small leakage current until it attains the breakdown voltage or a constant voltage. At this point, a small increase in reverse voltage will rapidly increases the 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. 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 Zener diode specially made to have a reverse voltage breakdown at a specific voltage. Observe the nearly constant voltage in the breakdown region. It is a system wherein a constant voltage level is maintained either using positive feedback or negative feedback. This zener diode voltage regulator circuit uses a Zener diode to establish a reference voltage. It is connected to the positive terminal of the d.c. 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. Furthermore, you must refer to the image below to see how Zener diode can be used as voltage regulator. Hence, V. Draw the Zener Diode Voltage Regulator Circuit Diagram. 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. The primary objective of the Zener diode as a voltage regulator is to maintain a constant voltage. Thus, a constant voltage called Zener voltage (V z) is maintained across the Zener diode when the supply voltage changes. We are going use it's reverse breakdown characteristics. To maintain a constant voltage across the load, even if the input voltage or load current varies, voltage. At this point, the current begins flowing seamlessly without any change in voltage. After it attains a voltage VZ, there is unrestricted current flow in the system. 1. Because of this sudden rise in electric current, breakdown occurs called zener … Click here to visit the playlist on this chapter The battery is charging with a constant current 20mA. Funded by MeitY (Ministry of Electronics & Information Technology) English हिंदी മലയാളം मराठी . What is the Experiment to Study Zener Diodes as a Voltage Regulator? The reverse characteristic is obtained by taking reverse voltage along – ve X-axis and reverse current along –ve Y-axis. Hence, it acts as a voltage regulator. Ans. Assume that the transformer primary to secondary coils turns ratio is N: N2 = 16:1. Zener diode as voltage regulator. The voltage drop across R L is 12 V, V in has values between 20 V and 35 V. The minimum current through R Zener diode as a voltage regulator: A Zener diode working in the breakdown region can serve as a voltage regulator. The circuit is wired up as shown in the figure. 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 maximum power rating P Z of the Zener diode is 2 W. Using the circuit above, calculate 1. Our mission is to provide a free, world-class education to anyone, anywhere. This voltage at which seamless current flow begins is known as the breakdown voltage. (i)Zener diode is used as voltage regulator. 33 6.34 12.9 34 6.35 14.7 35 6.36 19.7 36 6.367 20.7 On plotting V vs I graph, we get the following: 3. 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