i lab week 7 for Roel
e.lgo.
ecet210_week_7_lab_further_explanations.pptxNovember 21, 2013
1
How a Diode Works
A diode is an electrical device allowing current to flow through in only one direction. The term “diode” is used if I ≤ 1 A. If I>1A, we use the term “rectifier,” although both terms are commonly considered interchangeable.
November 21, 2013
2
Theoretical Analysis of the Rectifier Circuit
Given the circuit below, R1=1.0 kΩ. Sketch theoretical waveforms for the input (CH-1) signal and the output (CH-2) signal when a 10 VPP 1.0 kHz sine wave is applied to the circuit. Predict the result.
November 21, 2013
3
Theoretical Analysis of the Rectifier Circuit- What should we observe (frequency? Amplitude?)
CH-1 (input signal):
(>>t=0:0.00001:6/2000; y=5*sin(2*pi*1000*t); plot(t,y), grid on)
What should be the output signal???
November 21, 2013
4
Simulation of the Rectifier Circuit – Record the Result
Adjust the settings
of the function generator
Accordingly
November 21, 2013
5
Construct the Rectifier Circuit – Record the Result
Compare the theoretical, simulation, and hardware circuit results and make your comments
November 21, 2013
6
Construct the Rectifier Circuit – the O-Scope Display
Hardware circuit oscilloscope display
November 21, 2013
7
Theoretical Analysis of the Filtered Rectifier Circuit
Given the circuit below, R1=1.0 kΩ, C1=10 uF. Sketch theoretical waveforms for the input (CH-1) signal and the output (CH-2) signal when a 10 VPP 1.0 kHz sine wave is applied to the circuit. Predict the result.
November 21, 2013
8
Theoretical Analysis of the Filtered Rectifier Circuit – Output Signal
Given input signal below, what should we observe at the output?
The diode is to change the AC to DC signal
The capacitor is to “smoothen” the DC signal
November 21, 2013
9
Simulation of the Filtered Rectifier Circuit – Record the Result
Adjust the settings
of the function generator
Accordingly
November 21, 2013
10
Construct the Filtered Rectifier Circuit – Record the Result
Compare the theoretical, simulation, and hardware circuit results and make your comments
November 21, 2013
11
Construct the Filtered Rectifier Circuit – O-Scope Display
Hardware circuit oscilloscope display (notice scale change for Channel 2 for better viewing of the output signal)
November 21, 2013
12
Voltage Regulation using Zener Diode – The Circuit
November 21, 2013
13
How a Zener Diode Works
Zener diodes are special diodes which work reverse-biased at breakdown - specific voltage (“Zener voltage”). They are designed to work continuously at that specific voltage - anywhere from 1.8 to 200 V.
November 21, 2013
14
How a Zener Diode Works – The Circuit Example
For the circuit below, the voltage across the Zener diode will be maintained at 10V.
November 21, 2013
15
Voltage Regulation using Zener Diode – MultiSim Simulation (Change Scale on Channel B to view signal more clearly)
Adjust the settings
of the function generator
Accordingly
November 21, 2013
16
Voltage Regulation using the Voltage Regulator – The Circuit
Voltage regulator works as its name defines – to “regulate” the
voltage so that the output will be smooth and stable.
November 21, 2013
17
Voltage Regulation - the Voltage Regulator
Voltage regulators are devices designed to maintain output voltage at
constant levels.
At a constant
Voltage level
November 21, 2013
18
Voltage Regulation using Voltage Regulator – MultiSim Simulation
Adjust the settings
of the function generator
Accordingly
CH-2
CH-1
e
s
R1
D1
1N4004
1
2
GND
CH-2
CH-1
e
s
R1
D1
1N4004
12
GND
00.511.522.53
x 10
-3
-5
-4
-3
-2
-1
0
1
2
3
4
5
CH-1
e
s
CH-2
D1
1N4004
1
2
R1
C
1
CH-1
e
s
CH-2
D1
1N4004
12
R1
C1
00.511.522.53
x 10
-3
-5
-4
-3
-2
-1
0
1
2
3
4
5
R2
CH-1
CH-2
C
1
D2
1N4733
D1
1N4004
1
2
e
s
R1
R2
CH-1
CH-2
C1
D2
1N4733
D1
1N4004
12
e
s
R1
CH-2
D1
1N4004
1
2
C1
U1
LM7805
1
3
2
VIN
GND
VOUT
C3
CH-1
R1
C2
e
s
CH-2
D1
1N4004
12
C1
U1
LM7805
1
3
2
VIN
GND
VOUT
C3
CH-1
R1
C2
e
s
