This is the currently selected item. A 4V7 zener diode is used as a voltage regulator as shown in the diagram below. I clamped the voltage of the transformer with a 12 volt zener diode and the crosstalk problem disappeared. Furthermore, you must refer to the image below to see how Zener diode can be used as voltage regulator. you are here->home->Physics->Class 12->Zener Diode. Since the input voltage and the required output voltage is known, it is easier to choose a Zener diode with a voltage approximately equal to the load voltage, i.e. Simulator. Zener Diode checking. 1. 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. 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 … Hence, it acts as a voltage regulator. Vedantu academic counsellor will be calling you shortly for your Online Counselling session. When the minimum input voltage and the maximum load current is applied, the Zener diode current should always be minimum. The reverse characteristic is obtained by taking reverse voltage along – ve … We are going use it's reverse breakdown characteristics. Characteristics. 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. You will be able to get in-depth knowledge of the concept with these study notes prepared by our expert teachers. The current flows without much restriction while there can be a voltage drop of about 0.3 to 0.7 Volts. 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. Zener diode is used as a Shunt voltage regulator for regulating voltage across small loads. Here, look at the schematic symbol and appearance of a Zener diode. Therefore, the constant voltage helps Zener Diode as Voltage Regulator. 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. It is connected to the positive terminal of the d.c. 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. Its property of breakdown voltage which we have discussed earlier plays a key role in voltage regulation. This voltage is called zener voltage or breakdown voltage (Vz). At this point, the current begins flowing seamlessly without any change in voltage. 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. [HOTS; Foreign 2010] Ans. Mit Zenerdioden kann ein stabilisierter Spannungsausgang mit geringer Restwelligkeit bei wechselnden Laststrombedingungen erzeugt werden. Here, the output voltage is balanced even if there is fluctuation in voltage supply. Ans. 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 . Theory. CO-ED SCHOOL BHOPAL MOTHER TERESA SR. SEC. Zener Diodes are widely used as Shunt Voltage Regulators to regulate voltage across small loads. Zener diode has the property of behaving like a dc battery in ‘on’ state (i.e. The image depicts a current versus voltage graph. The reverse characteristic is obtained by taking reverse voltage along – ve X-axis and reverse current along –ve Y-axis. In spite of changes in the load current or in the input voltage, the Zener diode maintains a constant voltage across the load. Funded by MeitY (Ministry of Electronics & Information Technology) English हिंदी മലയാളം मराठी . When the breakdown occurs in Rectifier as well as Zener diode, it is known as Zener breakdown. 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. The breakdown voltage of Zener diodes will be constant for a wide range of current. This is how zener diode is used as voltage regulator. A simple circuit involving Zener diode as a regulator requires a resistor of the low value connected in series with the input voltage source. Zener Diode as DC voltage regulator. Hence, it acts as a voltage regulator. 3(b) to charge a rechargeable battery of voltage V8 = 10V. For example, we want that the voltage across a load in our circuit does not exceed, let’s say, 12 volts. 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. Due to this feature, it is used as a voltage regulator in d.c. circuit. Why is Zener Diode Used as a Voltage Regulator? What is the Experiment to Study Zener Diodes as a Voltage Regulator? Let’s take the value of R 2 as 1kΩ. Our mission is to provide a free, world-class education to anyone, anywhere. The normal AC voltage, Vp = 220V(rms) and can vary +10% during charging. In Zener diode, there is a conventional current flow from anode to cathode. The zener diode thus acts as a simple voltage regulator. A Zener diode can limit the voltage across it, making it a voltage regulator! Pro Lite, CBSE Previous Year Question Paper for Class 10, CBSE Previous Year Question Paper for Class 12. Zener diode as a voltage regulator: A Zener diode working in the breakdown region can serve as a voltage regulator. Zener Diode is Designed to Function in Which Region Without Having Any Damage? 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. This is a circuit diagram of a Zener diode used as a voltage regulator. Theory. To have a detailed understanding of Zener diode and its working, you should also read up on the related concepts. Due to this feature, it is used as a voltage regulator in d.c. circuit. The voltage drop across R L is 12 V, V in has values between 20 V and 35 V. The minimum current through R Feedback. 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. This zener diode voltage regulator circuit uses a Zener diode to establish a reference voltage. It is a system wherein a constant voltage level is maintained either using positive feedback or negative feedback. Resources. Procedure . 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 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. 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. Thus, a constant voltage called Zener voltage (V z) is maintained across the Zener diode when the supply voltage changes. Nov 25, 2020 - Zener diode as a voltage regulator - Semiconductor Electronics Class 12 Video | EduRev is made by best teachers of Class 12. This silicon semiconductor is designed to function in the condition of reverse bias. The zener diode thus acts as a simple voltage regulator. 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 . Ans. (i)Zener diode is used as voltage regulator. Zener diode & Zener breakdown . 3. 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. The battery is charging with a constant current 20mA. Hence, it acts as a voltage regulator. Zener diode is used as Shunt voltage regulator for regulating voltage across small loads. This video is highly rated by Class 12 students and has been viewed 628 times. 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. The Zener diode specially made to have a reverse voltage breakdown at a specific voltage. Hence, V. Draw the Zener Diode Voltage Regulator Circuit Diagram. However, when the reverse voltages are applied, or reverse feedback is provided, a tiny leakage current is observed between the zener voltage and 0V. regulation is to be made. Zener diodes as voltage regulators A Circuit diagram symbol for a zener diode. Zener Diode. ... Zener diode voltage regulator . The zener diode is designed to operate in the reverse break down region and has a predetermined reverse break down voltage V z. In this experiment, a voltage versus current graph is drawn, which shows the forward and reverse bias given to the diode. Zener diode and Zener diode as voltage regulator. Refer to the voltage reference circuit to set the resistance R 1. It works in such a way the reverse-biased can also work in breakdown conditions. Problems on zener diode as voltage regulator. Observe the nearly constant voltage in the breakdown region. When connected in parallel with a variable voltage source so that it is reverse biased, a Zener diode conducts when the voltage reaches the diode's reverse breakdown voltage. Science Class 12 Physics (India) Semiconductors Zener diode. However, when the reverse voltages are applied, or reverse feedback is provided, a tiny leakage current is observed between the zener voltage and 0V. In ‘on’ state , the voltage across zener diode remains constant until the voltage across it deops less than VZ . As Voltage Regulator 12. A Zener diode working in the breakdown region can act as 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. Explain, giving reason. Function of Zener Diode in Voltage Regulator Abstract The strength property which we use may not be capable to grant us normal voltage. Observe the nearly constant voltage in the breakdown region. By controlling the doping level, the breakdown region can be set during the manufacturing of the diode. 5. Pro Lite, Vedantu 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. Zener diode is a silicon semiconductor with a p-n junction that is specifically designed to work in the reverse biased condition. Zener diode. Procedure. Ans. The unregulated voltage is connected through a potential divider arrangement using the rheostat. 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. 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). 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. Subsequently, a P-N junction silicon semiconductor is used to make Zener diode regulator instead of any ordinary junction diode. Figure 2 shows the current versus voltage curve for a Zener diode. Viva Voce. It essentially steps down the input voltage to the desired level and keeps it at that same level during the supply. A voltage regulator is a device that regulates the voltage level. 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. However, this would not be possible with a standard diode. At this point, the current begins flowing seamlessly without any change in voltage. This circuit provides safety for the equipment connected at the terminals. The primary objective of the Zener diode as a voltage regulator is to maintain a constant voltage. Fabrication – It has heavily doped p- side and n-side. In a DC circuit, Zener diode can be used as a voltage regulator or to provide voltage reference. 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. Zener diode as a voltage regulator. Following is the link explaining the difference between Zener breakdown and Avalanche breakdown: The circuit diagram of a voltage regulator using a Zener diode is shown: Current through the diode increases when the voltage across the diode tends to increase which results in the voltage drop across the resistor. 2. Resources. Zener diode helps us in making of a voltage regulator. 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. How Zener Diode Act as a Voltage Regulator? You can even download our Vedantu app and access every related study material. 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 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. Learn the concepts of Class 12 Physics Semiconductor Electronics: Materials, Devices and Simple Circuits with Videos and Stories. Before you discuss how this diode can be used as a voltage regulator, you must know what a voltage regulator is. 3 Zener diode applications. This video is extremely helpful for understanding the basic concepts of zener diode, how it works and how it is used as a voltage regulator. Thus we will connect the zener diode parallel to the load such that the applied voltage will reverse bias it. Fig 2:Zener diode characteristic curve The forward bias region of a Zener diode is identical to that of a regular diode. The circuit is wired up as shown in the figure. Zener Diode as a voltage regulator. Let us say if Zener voltage of 5 V is used then, the voltage becomes constant at 5 V, and it does not change. 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. It can be understood how a zener diode acts as a voltage regulator by analyzing the below circuit. In the reverse bias condition the Zener diode is an open circuit and only a small leakage current is flowing as shown on the exaggerated plot. Therefore, the constant voltage helps Zener Diode as Voltage Regulator. By now we know that even if we use a rectifier to convert AC input voltage, the output fluctuates too. This may moreover have an effect on the proper functioning of the digital tool. In this video, let's explore how a Zener diode can be used to regulate voltage. For example a 3.6V volt Zener Diode has breakdown voltage at 3.6V i.e. In this Physics video in Hindi for class 12 we explained, with diagram, how Zener diode is used as voltage regulator. Feedback Cite this Simulator: Developed by Amrita Vishwa Vidyapeetham & CDAC Mumbai. The breakdown voltage of Zener diodes will be constant for a wide range of current. 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. Here, the voltage drop across the resistor is very less, and the output voltage results normally. Zener diode is specifically designed for this purpose. The resistance box is connected as load across the zener diode and the regulated voltage across it is measured using the multimeter. Now lets solve an example problem that illustrates the Zener diode as a voltage regulator. Ans. The maximum current flowing through the diode. By studying these concepts, you will be able to explain Zener diode as a voltage regulator in a better way and solve exercise questions. This ensures that even when a load is applied the voltage doesn’t drop. Hence, VZ = VL. The typical forward voltage at room temperature with a current of around 1 mA is around 0.6 volts. Simulator. The voltage difference between the input voltage V S and V Z will be dropped across the resistance R. Choose the Appropriate Option Regarding the Level of Doping in the Zener Diode. There is a series resistor connected to the circuit in order to limit the current into the diode. Here is a link to step by step physics experiment of Zener diode as a voltage regulator and how its made. you are here->home->Physics->Class 12->Zener Diode. 6 Result The breakdown potential, also called the zener potential i.e V z ≈ 6.30V. 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. when the voltage across the zener diode exceeds its zener voltage rating VZ) . Displacement As Function Of Time and Periodic Function, Issuing Debentures as Collateral Security, A Little Knowledge is a Dangerous Thing Essay, Vedantu Minimum reverse current is required for voltage regulation to keep diode in the breakdown region. 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. The maximum power rating P Z of the Zener diode is 2 W. Using the circuit above, calculate 1. A zener diode is a diode that breaks down at a specific voltage when it is reverse biased. The DC output voltage remains constant when the input varies within the limits as the voltage regulator is used. Similarly, the current through the diode decreases when the voltage across the diode tends to decrease. 2. 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. A Zener diode is used to get constant DC voltage from a DC unregulated output of a rectifier. As the zener diode is connected parallel to the load the voltage across the load will be always equal to the zener voltage. After it attains a voltage V. , there is unrestricted current flow in the system. The low value is required so as to allow the maximum flow of current through the diode, connected in parallel. Furthermore, choosing a Zener diode becomes easy as the required output voltage and the input voltage is known from the beginning. Khan Academy is a … 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. This voltage at which seamless current flow begins is known as the breakdown voltage. Zener diodes have voltage values from less than 2 volts to several hundred volts, and they can dissipate power ranging from 0.25 to 50 watts… or more. 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. Principle of zener diode. Design a Zener diode voltage regulator circuit as shown in Fig. 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. Zener Diode as a Voltage Regulator. We are going use it's reverse breakdown characteristics. At this point, a small increase in reverse voltage will rapidly increases the electric current. It is a special purpose diode, named after the inventor C. Zener; It is designed to operate under reverse bias in the breakdown region ; The symbol for Zener diode is . Viva Voce. 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. (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. Zener diodes are widely used as voltage references and as shunt regulators to regulate the voltage across small circuits. 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. 1. The breakdown voltage of Zener diodes will be constant for a wide range of current. Because of this sudden rise in electric current, breakdown occurs called zener … Wir erinnern uns aus den vorangegangenen Tutorials, dass die … Zener Diodes have a sharp reverse breakdown voltage and breakdown voltage will be constant for a wide rang of currents. The Zener diode acts as a conventional diode when it is connected in the forward direction. Why is zener diode used as a voltage regulator? (ii)Explain with the help of a circuit diagram, the use of a Zener diode as a voltage regulator. Zener diodes are used in circuits to maintain a fixed voltage across a load. 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. Now that you have understood the working of Zener diode as voltage regulator answer a few questions based on your understanding. pn junction and zener diode 12 class project.ppt 1. in DEPARTMENT OF PHYICS MOTHER TERESA SR. SEC. In this video, let's explore how a Zener diode can be used to regulate voltage. 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 … To keep the output voltage constant at the desired value in spite of variations in the supply voltage. Pro Lite, Vedantu Theory. I happened to check the output of the 12 volt wall transformer and found it was 13.4 volts. Zener Diode is a general purpose diode, which behaves like a normal diode when forward biased. The Zener diode is a unique sort of diode having a sharp reduce off voltage for the […] 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. 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After it attains a voltage VZ, there is unrestricted current flow in the system. This voltage at which seamless current flow begins is known as the breakdown voltage. This is how zener diode is used as voltage regulator. To maintain a constant voltage across the load, even if the input voltage or load current varies, voltage. Due to this feature, it is used as a voltage regulator in d.c. circuit. Zener diode is used as Shunt voltage regulator for regulating voltage across small loads. Procedure. Furthermore, choosing a Zener diode becomes easy as the required output voltage and the input voltage is known from the beginning. A Zener diode can limit the voltage across it, making it a voltage regulator! 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 . 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