I am facing issue of Failure of 200V, 5W Zener Diode (1N5388B) connected across primary winding of transformer in SMPS TOP 224Y based design. Normal diodes will also break down with a reverse voltage but the voltage and sharpness of the knee are not as well defined as for a Zener … We use Zener diodes for voltage regulation and voltage stabilisation. The above circuit can be modified by eliminating some components as shown in figure 2. continued till the voltage V0 begins to drop. The voltmeter connected to relay shows zener breakdown voltage of diode under test. The whole setup, including selection of voltage range in multimeter, takes more time than the actual measurement itself. Project topics on zener diode. You can test out its func?oning in forward and reverse-­‐bias modes. Here, is a circuit which is used to test the voltage of zener diode and also whether the zener diode is good or not. These are among the Pascal MASSON Les diodes I.2. This project produces a DC supply of about 45v when sing a BC337 transistor and will produce nearly 00v when a BC 638 is used. When the zener diode to be tested is connect across probes, a voltage is developed across resistor R1. unregulated voltage is connected through a potential divider arrangement using F. Najmabadi, ECE65, Winter 2012 . Light-emitting diode (LED) V. D0 = 1.7 – 1.9 V . The breakdown voltage of the unknown zener diode is indicated on the precalibrated dial of potmeter VR1. Final year research project topics, ideas and materials in PDF, Doc Download for free. The voltage developed across resistor R1 trigger transistor T1 as a result it provides base current to transistor T2. In the given diagram, the reversing biasing effect of the Zener is shown in … C but less then 75Deg. The Zener diode is a unique sort of diode having a sharp reduce off voltage for the duration of reverse biasing. Zener Diode Made specially to operate in the reverse breakdown region. This is the support page for Project 2.2 from Complete Electronics Self Teaching Guide with Projects. This flow of current in the opposite direction happens only when the voltage across the terminals exceed the threshold voltage called the Zener voltage. Such Zener diode voltage regulators are used in particular in voltage stabilizers, … Using the rheostat the unregulated voltage is decreased in steps, A graph is plotted with RL along X-axis and V0 The critical parameter of this type of diodes is the Zener breakdown voltage. Investigatory Project on Zener Diode as Voltage Regulator, Aim: To construct a voltage regulator using zener This circuit works satisfactorily and is more economic in compare to circuit shown in figure 1. When connected in forward bias, the zener diode behaves exactly like the normal silicone diode. The breakdown voltage of a Zener diode is very low. The Zener Diode undergoes the Zener breakdown which is a controlled breakdown and is due to the Zener Effect. Again, this circuit is only effective with circuits which operate off of DC power, which most electronic gadgets do. Project 2: The Zener Diode Voltage Regulator Objective. Zener Diode I-V Characteristics Zener diode works in the reversed biasing conditions in reversed biased mode its anode is connected with the negative terminal and cathode with the positive terminal of supply. A zener diode is like a normal silicon diode, where a forward biased diode will pass current with a ~1 volt drop. In this project, we will build a simple, yet effective, overvoltage protection circuit using a fuse and a zener diode, as the protecting elements, that will work for electronics that operate with DC voltage. In this article, we have posted two different circuit to test zener diode i.e. The resistance box is connected as load across the zener diode This is the minimum value for the resistor. He completed B-tech Degree in Electronics and Communication.He is a person who wants to implement new ideas in the field of Technology. Investigatory Project on Zener Diode as Voltage Regulator. Tag: zener diode as voltage regulator investigatory project Zener Diode Voltage Regulators Zener Diodes can be used to produce a stabilised voltage output with low ripple under varying load current conditions. For the zener of the curve we see that it would be activated for a Vz of 5V (rupture zone), logically inversely polarized, so it is negative. In the first phase, you will need a breadboard, zener diode, an LED, a resistor, a mul?meter and a few connec?ng wires. To check a Zener diode, it is connected across a DC power supply with a suitable resistor in series, then the voltage drop across Zener diode is measured using a multimeter. As current is used by the load, less current flows through the Zener diode. These diodes are called the zener diodes which can be used as voltage regulators, shunt regulators and surge protectors to limit the transient voltage spikes. • When forward biased, its characteristics are just those of ordinary diode. and the regulated voltage across it is measured using the multimeter. The circuit Zener Diode Tester is simple and advantageous as it provides quick and easy testing of Zener diode. The no load voltage VNL The voltage for RL = Some  Physics Experiment's Viva Questions 1. = VFL = … V, Voltage regulation (for RL =… Ω), For better reliability and accuracy, a relay is used in this circuit. The circuit is built around variable voltage regulator IC (LM317), IC LM317 is used to supply a definite amount of current to the zener diode under test (Figure 1). The resistance values = …. At the minimize off voltage, it conducts to large values of cutting-edge, however the voltage stays at consistent values. The value of this current is determined by resistor R2 and does not dependent on zener breakdown voltage. • A Zener diode is always reverse connected, ie, it is always reverse biased. When tested Zener for failure issue i observed that it is heating more then 60Deg. The circuit does not draw any current when the probes are left free. This “certain value” is called as the Breakdown voltage. Project 2.2: The Zener Diode Voltage Regulator. Investigatory Project on Zener Diode as Voltage Re... Investigatory Project on Bridge Rectifier, Investigatory Project on Full Wave Rectifier. Final year research project topics, ideas and materials in PDF, Doc Download for free. (i) A voltage regulator using zener diode is constructed and Its working based on the fact that in reverse breakdown (zener) region, a small change in voltage across the zener diode produces a very large change in current through the circuit but the voltage across the zener remains constant. A zener diode is like an ordinary diode only that it has been doped to have a sharp a breakdown voltage. 200Ω Zener diodes have a highly doped p-n junction. The zener diode thus acts as a simple voltage regulation is calculated as, VR%(for RL = 200Ω) One of the most important uses of zener diode is in making the constant voltage power supply. Zener Diode Tester Circuit for RL = ∞ is measured. With this, the base potentials for transistor T2 and transistor T1 become equal. A normal diode, when operated in reverse bias, gets damaged if the reverse current above a certain value is passed through it. Switching frequency of Power supply is 100 KHz. Even the input voltage varies or the exterior load varies, the output voltage remains at a consistent price. As this circuit uses regulated supply it does not damage zener diode under test. down region and has a predetermined reverse break down voltage Vz. It conducts with the same 0.7v voltage drop that … It is mainly a special property of the diode rather than any special type of equipment. • A Zener diode has sharp break down voltage, called Zener voltage . General Instructions. The circuit is wired up as shown in the figure. The Zener diode maintains a stable output voltage irrespective of the input voltage provided the maximum zener current is not exceeded. 0 Diode OFF: 0 and Diode ON: and 0. Two multimeters set to measure current (mA) One multimeter set to measure DC voltage; One 56-ohm, 0.5-watt resistor; One 1N4735A zener diode; One lamp rated for approximately 25 mA at 6 volts. F. Najmabadi, ECE65, Winter 2012 Zener: and . A Zener diode allows current to flow from its anode to its cathode like a normal semiconductor diode, but it also permits current to flow in the reverse direction when its "Zener voltage" is reached. A resistance of 1000Ω is introduced in the resistance box. The regulated voltage V0 and the unregulated voltage input Vi C. in just 30sec. the rheostat. Sreejith Hrishikesan Nair is a M-Tech graduate in Communication Systems. The orange … Now, the voltmeter reads around 30V with no zener diode connected across the probe. The main purpose for the project is to test Zener Diodes as these generally require a high voltage power supply to cater for zeners up to about 47 volt. Aim: To construct a voltage regulator using zener diode and to study its (a) load variation and (b) line variation . The special property of the diode is that there will be a breakdown in the circuit if the voltage applied across a reversely biased circuit. With the help of voltmeter (or multimeter in voltmeter mode) it directly reads the voltage of zener diode which is under test. Zener Diode. Parts List. They provide a low-cost and no frill method for voltage regulation. One extra push switch SW1 is connected which is pressed while testing zener diode. general zener diode tester circuit and modified zener diode tester circuit. Most of the diodes are made from silicon because it can afford high temperature, however, germanium is also used for manufacturing where low voltage drop is required. You can also use multimeter instead of voltmeter but at first multimeter set in suitable voltage range. diode and to study its, (ii) Unregulated power supply of about 16 V. The zener diode is designed to operate in the reverse break The meter now shows the actual zener voltage. steps, noting the voltage V, across it each time. regulator. along X-axis and V0 along Y-axis to show the line variation. The readings are tabulated. 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