Lab 5_TimeProportioningControl LAB
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ECPI University *
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220
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Industrial Engineering
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Jan 9, 2024
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EET 220 Industrial Applications
Professor D. Overbye
Week 3 Lab 5 “Time Proportioning Control”
By: Deandre Wheelington
ECPI University
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 a Judicial
Review Board hearing if summoned.
Name Deandre Wheelington
Date: 24 Nov 23
Abstract:
In this lab, we will be demonstrating how to control the average voltage/power
delivered to an op-amp load using a method known as “time-proportioning”. We
will also measure the duty cycle of our output Pulse Width Modulated (PWM)
signal using an oscilloscope and a formula.
Introduction:
We will first focus on building the circuit in this lab using multisim. Once the circuit
is built, we will open up the oscilloscope window. We will run the simulation at
different loads of resistance by using our adjustable potentiometer and record our
values below in a table. The values needed to be recorded are the “On time” or
the time that our load was on before it started another duty cycle, the entire duty
cycle time, and finally, the measured output voltage during the set potentiometer
value. We will find these values in our tables using given formulas down below.
Lab 5: Time Proportioning Control
Objectives:
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.
VCC
10V
R2
10kΩ
Key=A
0 %
U1
741
3
2
4
7
6
5
1
V1
5Vpk
60Hz
0°
XSC1
A
B
Ext Trig
+
+
_
_
+
_
VCC
10V
Offset = 5V
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 (t
ON
).
Potentiometer
setting
ON Time (t
ON
)
Duty cycle
Output
Voltage
0%
N/A
100%
9.12 V
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