By studying these concepts, you will be able to explain Zener diode as a voltage regulator in a better way and solve exercise questions. Zener diode operation The Zener diode operates just like the normal diode when in the forward-bias mode, and has a turn-on voltage of between 0.3 and 0.7 V. Further, the application of reverse voltage on the Zener diode ensures that the voltage remains constant for a significant range of current. 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. [HOTS; Foreign 2010] Ans. regulation is to be made. Zener Diode. CO-ED SCHOOL BHOPAL MOTHER TERESA SR. SEC. This is the currently selected item. Hence, V. Draw the Zener Diode Voltage Regulator Circuit Diagram. Zener diodes are widely used as voltage references and as shunt regulators to regulate the voltage across small circuits. Thus, a constant voltage called Zener voltage (V z) is maintained across the Zener diode when the supply voltage changes. The primary objective of the Zener diode as a voltage regulator is to maintain a constant voltage. When the input voltage is less than the breakdown voltage (V z), very small current flows through the diode and the whole input appears across the output terminals. Design a Zener diode voltage regulator circuit as shown in Fig. Zener diode & Zener breakdown . Let us say if Zener voltage of 5 V is used then, the voltage becomes constant at 5 V, and it does not change. Your email address will not be published. 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. 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. The primary objective of the Zener diode as a voltage regulator is to maintain a constant voltage. 3 Zener diode applications. 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. Funded by MeitY (Ministry of Electronics & Information Technology) English हिंदी മലയാളം मराठी . Resources. Additionally, the voltage drop across the diode remains constant over a wide range of voltages, a feature that makes Zener diodes suitable for use in voltage regulation. Zener Diode as a voltage regulator. The Zener diode acts as a conventional diode when it is connected in the forward direction. Zener Diode as a Voltage Regulator. We are going use it's reverse breakdown characteristics. when voltage equal to or greater than the breakdown voltage(3.6V) is applied across the Zener Diode in reverse direction the Zener Breakdown occurs and the output voltage of the Zener Diode becomes fixed at 3.6V. At this point, a small increase in reverse voltage will rapidly increases the electric current. You will be able to get in-depth knowledge of the concept with these study notes prepared by our expert teachers. The battery is charging with a constant current 20mA. Zener diode helps us in making of a voltage regulator. Viva Voce. The reverse characteristic is obtained by taking reverse voltage along – ve … Why is Zener Diode Used as a Voltage Regulator? Principle of zener diode. Due to this feature, it is used as a voltage regulator in d.c. circuit. A Zener diode working in the breakdown region can act as voltage regulator. There is a series resistor connected to the circuit in order to limit the current into the diode. Zener Diodes have a sharp reverse breakdown voltage and breakdown voltage will be constant for a wide rang of currents. 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. Figure 2 shows the current versus voltage curve for a Zener diode. Zener Diode is Designed to Function in Which Region Without Having Any Damage? you are here->home->Physics->Class 12->Zener Diode. Mit Zenerdioden kann ein stabilisierter Spannungsausgang mit geringer Restwelligkeit bei wechselnden Laststrombedingungen erzeugt werden. 6 Result The breakdown potential, also called the zener potential i.e V z ≈ 6.30V. 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. Its property of breakdown voltage which we have discussed earlier plays a key role in voltage regulation. Zener diode. you are here->home->Physics->Class 12->Zener Diode. It is connected to the positive terminal of the d.c. 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. The maximum current flowing through the diode. (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. This video is highly rated by Class 12 students and has been viewed 628 times. 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. The zener diode thus acts as a simple voltage regulator. 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. The breakdown voltage of Zener diodes will be constant for a wide range of current. The low value is required so as to allow the maximum flow of current through the diode, connected in parallel. Here, look at the schematic symbol and appearance of a Zener diode. 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. In spite of changes in the load current or in the input voltage, the Zener diode maintains a constant voltage across the load. Choose the Appropriate Option Regarding the Level of Doping in the Zener Diode. By now we know that even if we use a rectifier to convert AC input voltage, the output fluctuates too. In ‘on’ state , the voltage across zener diode remains constant until the voltage across it deops less than VZ . (ii)Explain with the help of a circuit diagram, the use of a Zener diode as a voltage regulator. Zener diode is specifically designed for this purpose. Wir erinnern uns aus den vorangegangenen Tutorials, dass die … 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 . 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. After it attains a voltage V. , there is unrestricted current flow in the system. 3. How Zener Diode Act as a Voltage Regulator? Fig 2:Zener diode characteristic curve The forward bias region of a Zener diode is identical to that of a regular diode. Fabrication – It has heavily doped p- side and n-side. (Actually, to be certain the zener diode could handle the power, I placed two 12 volt zeners in parallel. Hence, it acts as a voltage regulator. This voltage is called zener voltage or breakdown voltage (Vz). Sorry!, This page is not available for now to bookmark. Chapter: 11th 12th std standard Class Physics sciense Higher secondary school College Notes | Study Material, Lecturing Notes, Assignment, Reference, Wiki description explanation, brief detail | Posted On : 14.03.2016 05:16 am . Resources. 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). Zener Diode as a Voltage Regulator In Zener diode, there is a conventional current flow from anode to cathode. Required fields are marked *. Our mission is to provide a free, world-class education to anyone, anywhere. Video. Because of this sudden rise in electric current, breakdown occurs called zener … The zener diode is designed to operate in the reverse break down region and has a predetermined reverse break down voltage V z. A simple circuit involving Zener diode as a regulator requires a resistor of the low value connected in series with the input voltage source. Learn the concepts of Class 12 Physics Semiconductor Electronics: Materials, Devices and Simple Circuits with Videos and Stories. To keep the output voltage constant at the desired value in spite of variations in the supply voltage. Let’s take the value of R 2 as 1kΩ. Zener diode is used as Shunt voltage regulator for regulating voltage across small loads. 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. Hence, it acts as a voltage regulator. Explain, giving reason. It maintains a constant output voltage even when input voltage V i or load current I L varies. We are going use it's reverse breakdown characteristics. In this experiment, a voltage versus current graph is drawn, which shows the forward and reverse bias given to the diode. This voltage at which seamless current flow begins is known as the breakdown voltage. Why is zener diode used as a voltage regulator? Zener diodes are used in circuits to maintain a fixed voltage across a load. Hence, it acts as a voltage regulator. The typical forward voltage at room temperature with a current of around 1 mA is around 0.6 volts. Nov 25, 2020 - Zener diode as a voltage regulator - Semiconductor Electronics Class 12 Video | EduRev is made by best teachers of Class 12. 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 . We have discussed the application of Zener diode as voltage regulator and now we will discuss the other two points. Here, the output voltage is balanced even if there is fluctuation in voltage supply. 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. However, when the reverse voltages are applied, or reverse feedback is provided, a tiny leakage current is observed between the zener voltage and 0V. Zener diode has the property of behaving like a dc battery in ‘on’ state (i.e. The current flows without much restriction while there can be a voltage drop of about 0.3 to 0.7 Volts. Zener Diode as DC voltage regulator. Observe the nearly constant voltage in the breakdown region. A 4V7 zener diode is used as a voltage regulator as shown in the diagram below. Characteristics. Zener diode. Your email address will not be published. Vedantu academic counsellor will be calling you shortly for your Online Counselling session. 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. It works in such a way the reverse-biased can also work in breakdown conditions. Simulator. Theory. In this video, let's explore how a Zener diode can be used to regulate voltage. However, this would not be possible with a standard diode. However, the Zener Diode or Breakdown Diode, as they are sometimes referred too, are basically the same as the standard PN junction diode but they are specially designed to have a low and specified Reverse Breakdown Voltage which takes advantage of any reverse voltage applied to it. Ans. Simulator. To have a detailed understanding of Zener diode and its working, you should also read up on the related concepts. You can even download our Vedantu app and access every related study material. Before you discuss how this diode can be used as a voltage regulator, you must know what a voltage regulator is. In this video, let's explore how a Zener diode can be used to regulate voltage. A Zener diode is used to get constant DC voltage from a DC unregulated output of a rectifier. The breakdown voltage of Zener diodes will be constant for a wide range of current. The image depicts a current versus voltage graph. Function of Zener Diode in Voltage Regulator Abstract The strength property which we use may not be capable to grant us normal voltage. Problems on zener diode as voltage regulator. The normal AC voltage, Vp = 220V(rms) and can vary +10% during charging. Zener diode as a voltage regulator: A Zener diode working in the breakdown region can serve as a voltage regulator. Now that you have understood the working of Zener diode as voltage regulator answer a few questions based on your understanding. Similarly, the current through the diode decreases when the voltage across the diode tends to decrease. 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. Therefore, the constant voltage helps Zener Diode as Voltage Regulator. Zener Diode is a general purpose diode, which behaves like a normal diode when forward biased. 2. 1. Ans. 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. The semiconducting silicon material used in the zener diode as voltage regulator experiment helps it function in the forward as well as reverse voltages without breakdown. Procedure. Theory. The Zener diode specially made to have a reverse voltage breakdown at a specific voltage. This is a circuit diagram of a Zener diode used as a voltage regulator. Thus, a constant voltage called Zener voltage (V z) is maintained across the Zener diode when the supply voltage changes. Ans. Now lets solve an example problem that illustrates the Zener diode as a voltage regulator. This silicon semiconductor is designed to function in the condition of reverse bias. Furthermore, you must refer to the image below to see how Zener diode can be used as voltage regulator. For example, if you happen to pass a 6V reverse voltage through a diode of 3V, then the measure of voltage across the diode will be 3V only. The primary objective of the Zener diode as a voltage regulator is to maintain a constant voltage. In a DC circuit, Zener diode can be used as a voltage regulator or to provide voltage reference. 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CO-ED SCHOOL KOLAR ROAD BHOAPL DEPARTMENT OF PHYSICS PROJECT REPORT INVESTIGATORYPROJECT ON PN JUNCTION AND DIODES PROJECT REPORT Submitted by Govind Patel Submitted to Mrs Ratna Hajela … Zener diode is used as a Shunt voltage regulator for regulating voltage across small loads. The maximum power rating P Z of the Zener diode is 2 W. Using the circuit above, calculate 1. As Voltage Regulator In a DC circuit, Zener diode can be used as a voltage regulator or to provide voltage reference. When connected in reverse bias in series with a current limiting resistor, the voltage across the zener diode remains constant as long as a certain minimum current flows through it. Hence, VZ = VL. Figure 2 shows the current versus voltage curve for a Zener diode. Theory. 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. Zener Diode as a voltage. I clamped the voltage of the transformer with a 12 volt zener diode and the crosstalk problem disappeared. Feedback. The zener diode will continue in regulating the voltage till the zener diode current falls below the minimum I z min value in the reverse breakdown region. This circuit provides safety for the equipment connected at the terminals. Minimum reverse current is required for voltage regulation to keep diode in the breakdown region. Here is a link to step by step physics experiment of Zener diode as a voltage regulator and how its made. 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. Zener diode as voltage regulator. 5. Zener diode as a voltage regulator. However, when the reverse voltages are applied, or reverse feedback is provided, a tiny leakage current is observed between the zener voltage and 0V. For example a 3.6V volt Zener Diode has breakdown voltage at 3.6V i.e. Subsequently, a P-N junction silicon semiconductor is used to make Zener diode regulator instead of any ordinary junction diode. VZ  = VL. A zener diode is a diode that breaks down at a specific voltage when it is reverse biased. pn junction and zener diode 12 class project.ppt 1. in DEPARTMENT OF PHYICS MOTHER TERESA SR. SEC. A Zener diode can limit the voltage across it, making it a voltage regulator! When the minimum input voltage and the maximum load current is applied, the Zener diode current should always be minimum. Zener diode is a silicon semiconductor with a p-n junction that is specifically designed to work in the reverse biased condition. Indem die Zenerdiode einen kleinen Strom von einer Spannungsquelle über einen geeigneten Strombegrenzungswiderstand (RS) durch die Diode leitet, leitet sie genügend Strom, um einen Spannungsabfall von Voutaufrechtzuerhalten. It can be understood how a zener diode acts as a voltage regulator by analyzing the below circuit. Furthermore, choosing a Zener diode becomes easy as the required output voltage and the input voltage is known from the beginning. The DC output voltage remains constant when the input varies within the limits as the voltage regulator is used. Displacement As Function Of Time and Periodic Function, Issuing Debentures as Collateral Security, A Little Knowledge is a Dangerous Thing Essay, Vedantu Zener Diode. 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