28 May Explain the reason for performing the experiment and give a concise summary of the theory involved, including any mathematical detail relevant to later discussion in the report. ?Con
Abstract
A brief description of the experiment. The abstract should not exceed four or five sentences.
Introduction
In your own words, explain the reason for performing the experiment and give a concise summary of the theory involved, including any mathematical detail relevant to later discussion in the report.
Conclusions
This section should reflect your understanding of the experiment. Important points to include are a brief discussion of your final results, an interpretation of the actual experimental results as they apply to the objectives of the experiment set out in the introduction should be given
ANSWER ALL THE QUESTIONS
EET220
Industrial Applications
Instructor: Name
Lab 5
Time Proportioning Control
Student Name(s): Name
Honor Pledge:
I pledge to support the Honor System of ECPI. I will refrain from any form of academic dishonesty or deception, such as cheating or plagiarism. I am aware that as a member of the academic community, it is my responsibility to turn in all suspected violators of the honor code. I understand that any failure on my part to support the Honor System will be turned over to a Judicial Review Board for determination. I will report to the Judicial Review Board hearing if summoned.
Name
Student Name Date: 5/20/2023
Adding your name here constitutes your agreement to the Honor Pledge as stated.
Contents Abstract 3 Introduction 3 Part 1: Methods and Procedures 4 Conclusion 10 References 11
Abstract
I ntroduction
Part 1: Methods and Procedures
After performing this experiment, you will be able to:
1. Control the average voltage/power delivered to the load using Time proportioning method.
2. Measure the duty cycle of the Pulse Width Modulated (PWM) signal.
Procedure:
1. Construct the following circuit using multisim.
Figure 1: Time proportioning circuit
2. Set the potentiometer to 0% and Run the simulation. Observe the oscilloscope; you should be able to see a positive DC voltage because the op-amp is saturated. Means the voltage at the non-inverting terminal is greater than the inverting terminal.
3. Measure the dc output voltage using the voltage probe at pin 6. Record the result in table 1 below under output voltage.
4. Set the potentiometer to 10%; you should be able to see the following waveform.
Figure 2: Measuring ON time of the pulse
5. Place the cursors 1 and 2 at the beginning and ending of the pulse as shown above.
6. Observe the value of T2-T1, which gives the ON time of the pulse. Record the result in the table 1 below under ON time (tON).
|
Potentiometer setting |
ON Time (tON) |
Duty cycle |
Output Voltage |
|
0% |
N/A |
100% |
9.118V |
|
10% |
12.879ms |
79.3% |
9.118V |
|
30% |
9.824ms |
60.5% |
9.118V |
|
60% |
6.186ms |
38.7% |
9.118V |
|
90% |
2.32ms |
14.3% |
9.118V |
|
100% |
N/A |
0% |
881.7V |
Table 1: Duty cycle measurement
7. Now place the cursors such that time period (T) of the waveform can be measured as shown below. To measure the time period cursors must be place to cover one complete cycle. This time period will not change since the frequency of the signal stays at 60Hz.
Figure 2: Measuring time period of the waveform
8. The measured time period (T) is ______16.239ms_____.
9. Calculate the duty cycle using the formula below. Record the duty cycle in table 1 above.
% DC =
10. Record the dc output voltage using the probe under output voltage.
11. Now, change the potentiometer setting as listed in table 1 above and repeat steps 5 through 10.
Experiment Questions:
1. The term duty cycle refers to the amount of time a signal is ______ compared to the period of one complete cycle.
A. off B. on
2. The output voltage of op-amp is positive saturation, when the voltage applied to the noninverting input is greater than the inverting input.
A. inverting B. noninverting
3. A square wave that is 20V at its high state and 0V when it is off will produce an average DC voltage of ________ when its duty cycle is 75%. Formula: VOUT = Duty Cycle * Peak voltage
A. 7.5V B. 10V C. 15V
Conclusion
References
Bartelt, T. L. (2011). Industrial Automated Systems: Instrumentation and Motion Control. Cengage Limited. https://ecpi.vitalsource.com/books/9781305474277
(2017) National Instruments Multisim (V 14.1) [Windows]. Retrieved from http://www.ni.com/multisim/
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