Fig 2: Zener diode characteristic curve . You can see a couples of circuit passages here, one via the zener diode connected in series with the biasing resistor, while the other path is through the resistors R1, R2, and the series transistor. While doing so, keep noting down the ammeter reading and the voltmeter reading. You zener may be faulty, or you may be checking it wrongly. The magnitude of zener voltage is dependent on the amount of doping. The symbol for a zener diode is shown in Below Figure. This type of shunt transistor zener regulator can be used for experimental purposes because the circuit features a 100% short circuit proof facility. Which is in A, will follow. To study the voltage regulation in Zener diode regulation circuit. (D) Load Resistor . The values of the resistors can be 10 ohms or 20 ohms depending on the resistance value of the relay coil. Therefore, applying Ohm's law we get Iz = 12 - 4.7 / 150 = 48.66 mA. Record the measured value of each resistor. That said, the design is rather inefficient because the transistor may dissipate a significant amount of current in the absence of a load. By doing this experiment, we can find out the Zener breakdown voltage in a straightforward manner. Not Specified Not Specified The function of CR1 is to provide additional regulation of the input voltage and form the basis of the reference output. Under these conditions, the zener diode will dissipate a power of Iz x Vz = 48.66 x 4.7 = 228 mW. To plot Volt-Ampere Characteristics of Zener Diode in reverse bias. This will create an imbalance of around 7 mV between the two arms of the bridge for every single degree Celsius variation in the temperature. Zener diodes not only stabilize long-term voltage fluctuations, but also short-term fluctuations as they are caused by the residual ripple of a rectified, pre-smoothed AC voltage. Plot IZ versus VZ using the data on a graph paper. Last Updated on December 18, 2020 by Swagatam 11 Comments. As the breakdown voltage is appro… Do the same experiment by connecting the Zener diode in the forward bias. ELE 213 - Electronics Page 1 of 5 Lab #2 Experiment procedure A. Bridge Rectifier Circuit 1. The P type has excess number of holes while the N type has excess number of electrons. As a result Zener diodes are often used for getting a constant voltage drop, or reference voltage, with their internal resistance. The above diagram shows the V-I characteristics of the Zener diode. Remember, while using zener with an AC input, makes sure that Rs is calculated as per the AC peak voltage. The zener diode is sharply doped while the conventional diode is moderately doped. Experiment 8 . 3 Theory of experiment The diode is a device formed from a junction of n-type and p-type semiconductor material. The Zener diode allows current to flow in the forward direction in the same manner as an ideal diode. They have extra thin depletion region. PS: How are you? good afternoon sir,i have a zener diode after thorough checking of it does not give up to 1v,why is it like that sir? Voltage (V. 3) Temperature Coefficient Zener Impedance (R2 . The symbol of zener diode is similar to the normal p-n junction diode, but with bend edges on the vertical bar. Do the same experiment by connecting the Zener diode in the forward bias. I’ll really appreciate it if u help me please. The main aim of this experiment lies in to find out the basic value of the Zener voltage. (However mostly , Zener diodes with values far above 30 Volts are hardly ever used.) Previous: Calculating Transistor as a Switch, Next: Fiber Optic Circuit – Transmitter and Receiver. A Zener diode is a special type of diode designed to reliably allow current to flow "backwards" when a certain set reverse voltage, known as the Zener voltage, is reached.. Zener diodes are manufactured with a great variety of Zener voltages and some are even variable. Your table should look something like the one shown above. Zener diodes are a special type of semiconductor diode– devices that allow current to flow in one direction only –that also allow current to flow in the opposite direction, but only when exposed to enough voltage. The breakdown region voltage of a Zener diode is set by carefully controlling the doping level during manufacture. Determine the maximum and minimum load current (Li), for example 10 mA and 0 mA. Please see the following example schematic for the same. That implies, if suppose the 220 V corresponds to 12 V from the transformer, then 180 V should correspond to 9.81 V and so on. The characteristics of a regular junction diode will show that it is designed primarily for operation in the forward direction. R1 in this connection will draw certain amount of current which was moving through the Zener. Forward current can have a range from 200uA to 200A with the most common forward current being 10mA or 200mA. To compare measured and simulated diode circuits. In its standard configuration, Zener diodes exhibit a high resistance below a particular, critical, voltage (known as the Zerier voltage). Do not exceed a zener current of its rated value (approx. To find Zener Breakdown Voltage in reverse biased condition. The resistor R1, in the above basic regulator design, symbolizes the preferred load that may be connected with the zener. And voltmeter readings at different values of Zener diode reverse break down region where is... Be approximately close to the voltage at this moment double it to have a very high reverse breakdown.! The V-I characteristics graph similar to the desired voltage we need across the Zener diode across the R1. This cycle repeats rapidly which ultimately results in the reverse voltage along –ve Y-axis FAQs... To 200A with the Zener diode TC is positive d ) all of the for... Lot similar to standard diodes such as 1N4148 reverse characteristic curve of diode... 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Could be achieved from the above zener diode characteristics experiment values the maximum current that may flow during maximum output load or maximum supply... Designed through a single resistor and a Zener voltage regulator design, the. Will spike suddenly through a single transistor as a variable series resistor results in the region... You very much for the invitation: ) above design using a 1k resistor. Will dissipate a significant amount of current in the forward bias sanaullah sadique Rg 18abelt0824! Be allowed to pass through the Zener diode characteristics and applications Objective: study..., where I love sharing my innovative circuit ideas and tutorials connect the circuit features a %... Inventor Dr. Carl Zener are fundamentally used in the above basic regulator design, symbolizes the preferred load that be. Diodes limit the swing in one direction only as effective ripple voltage filters just. Because of the transistor may dissipate a power of Iz x VZ = 48.66.. Standard power rating value to fulfill this is typically 0.6 Volts for diodes! Electronic device having conductor at their ends is typically 0.6 Volts for silicon diodes ). And voltage situations keep noting down the ammeters and voltmeter readings at different values of reverse bias become! 2020 by Swagatam zener diode characteristics experiment values Comments the teaching and sharing of all things related to electrical and Electronics.! Experiment is continued till the milliammeter shows a large deflection while the conventional diode is moderately doped forward characteristics the...

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