Zener diode as a voltage regulator working principles. The voltage at this value is the zener breakdown voltage. The performance of zener voltage regulator was evaluated under a wide temperature range from 300. 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. The zener diode provides the voltage reference, and the base to emitter voltage of the transistor is the control voltage. Zener diode, resistor, variable dc power supply, milliammeter.
In this video you will get full experimental information about zener diode and zener diode as voltage regulator. The zener diode behaves as a voltage regulator because, in the reverse bias condition, it has a relatively flat voltage to current curve. Zener diode is a pn junction diode specially designed to operate in the reverse biased mode. Different zener diodes have a different breakdown voltage. Study of zener diode as a voltage regulator free download as pdf file. Fix the load resistance value by using load resistance slider. Zener diode as voltage regulator tutorial electronicstutorials. Change the rheostat value from maximum to 0 by the interval 100. It works in such a way the reversebiased can also work in breakdown condition. There is a series resistor connected to the circuit in order to limit the current into the diode.
Zener diode has the property of behaving like a dc battery in on state i. Zener diode as voltage regulator experiment youtube. Zener diode lab viva questions and answers pdf free download. A 4v7 zener diode is used as a voltage regulator as shown in the diagram below. The aim of the laboratory work is to understand the principle of zener diode operation and also apply the knowledge practically by completing laboratory tasks.
We present the results from a screening experiment to identify significant parameters in circuit level seu simulations. In this part, limiting circuit is described in figure 1 above. We should select a zener diode with a breakdown voltage approximately equal to the voltage we need across the device. The stabilised output voltage is always selected to be the same as the breakdown voltage v z of the diode. While doing the experiment, do not exceed the rating of the diode. Plot the graph in which v in at xaxis v l at yaxis. By doing this experiment, we can find out the zener breakdown voltage in a. The zener voltage regulator consists of a current limiting resistor r s connected in series with the input voltage v s with the zener diode connected in parallel with the load r l in this reverse biased condition. Zener diode experiment viva questions with answers characteristics mcqs interview questions. For example, we want that the voltage across a load in our circuit does not exceed, lets say, 12 volts. Zener diode, resistors, power supply, multi meter circuit diagram. Note down the corresponding input voltage and output voltage and tabulate it.