In the Name of Allah
Palestine Technical University
Electrical Engineering Department
Experiment Name : Diodes With Special Properties (Zener Diodes)
Experiment Number : 4
Student’s Name
Name of instructor : Eng. Asma’ Shar’ab
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Zener Diodes Experiment: Characteristic, Voltage Dependence, and Data Analysis, Exams of Circuit Theory
The details of an electrical engineering experiment conducted at Palestine Technical University on Zener diodes. the theory behind Zener diodes, objectives of the experiment, data and calculation results, and a conclusion. The experiment aimed to plot the characteristic of a zener diode, determine the zener voltage Uz, and study the dependence of output voltage Vout on input voltage Vin.
What you will learn
- What is the value of the zener voltage Uz?
- What is the value of the threshold voltage Uth?
- What is the maximum current Iz?
Typology: Exams
2020/2021
1 / 5
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In the Name of Allah Palestine Technical University Electrical Engineering Department Experiment Name : Diodes With Special Properties (Zener Diodes) Experiment Number : 4 Student’s Name Name of instructor : Eng. Asma’ Shar’ab
Theory :
Zener diodes are silicon diodes whose on state characteristic is the same as that of rectifier diodes. Zener diodes differ from rectifier diodes in the relatively low breakdown voltages. when the breakdown voltage is exceeded, the current in reverse direction rises steeply(quickly). Rv = (Vop - Vz) / (Iz + Il) Vop = applied operating voltage Uz = zener voltage of the used type of diode Iz=average admissible z-current Il=current across load resistor RL acting parallellly to the zener diode RL : Objectives Plot the characteristic of a zener diode and determine the Z-voltage with the oscilloscope. plot a graph showing the dependence of output voltage Vout on Input voltage Vin. showing the dependence of output voltage Vout on Input voltage Vin.
This is the graph for the two Zener's (3.3 V & 10.0 V) and describe how is the current will be among different values of voltages. 12 10 8 6 4 2 0 0 5 10 15 20 25
10 And the x-y graph for the Zener in the oscilloscope was like this:
Conclusion: In this experiment we use a zener diodes to notify the behavior of the voltage and the current in the zener diode. We notice that at the beginning of increasing the voltage that the current is increasing slowly until the break down point then the current increasing very largely. At this time when the diode reaches to the reverse break down region the voltage becomes almost constant. Questions: Q 1 : What is the value of the zener voltage Uz? Q 2 : What is the max. current Iz? Iz max= UR/R = Q 3 : What is the value of the threshold voltage Uth?