ELT-306 WA2
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School
Thomas Edison State College *
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Course
306
Subject
Electrical Engineering
Date
Jan 9, 2024
Type
docx
Pages
4
Uploaded by kevinalandro
Kevin Austin
ELT-306 WA2
Questions: 1.
Describe the first, second, and third approximations for a diode.
In the first approximation, the diode is often modeled as an ideal diode. An ideal diode is a theoretical concept that has zero resistance when forward-biased and infinite resistance when reverse-biased. The ideal diode model simplifies calculations and is often used for basic analysis to understand the fundamental characteristics of diodes.
The second approximation involves a more realistic model, known as the constant voltage drop model or piecewise linear model. In this model, the diode is considered to have a constant voltage drop when it is conducting in the forward direction. This voltage drop is typically around 0.7 volts for silicon diodes. When the diode is reverse-biased, it is modeled as an open circuit with no current flow.
The third approximation is a more accurate representation of a diode's behavior and involves the Shockley diode equation. The Shockley equation describes the current-
voltage relationship of a diode and takes into account the exponential relationship between the diode current and voltage. The equation is given by: I
=
I
s
(
e
V
nV
T
−
1
)
I is the diode current, I
s
is the reverse saturation current
V is the voltage across the diode
n is the ideality factor
V
T
is the thermal voltage
Kevin Austin
ELT-306 WA2
2.
What are the diode’s terminals labeled as?
Anode (A):
The anode is the positive terminal of the diode. Current enters the diode through the anode when the diode is forward-biased.
Cathode (K):
The cathode is the negative terminal of the diode. Current exits the diode through the cathode when the diode is forward-biased. 3.
Show a diagram for a full wave bridge rectifier.
Problems:
Kevin Austin
ELT-306 WA2
1.
For the circuit shown, R = 30 Ω, the power supply is set to 5 V. Use the second approximation for the diode. Calculate the circuit
current, the diode, and resistor voltage and power. 5 V - 0.7V = 4.3 V/ 30Ω= 0.14 A for circuit 5V(0.14A)= 0.7 W for circuit | 30Ω(0.14 A) = 4.2 V for resistor | 4.2 V (R1)+0.7V= 4.9 V
2. The input winding has 1000 turns, winding #1 has 200 turns, winding #2 has 100 turns, winding #3 has 2000 turns. If the input voltage, E
IN
is set at 250 V, calculate the three secondary voltages.
Winding 1: 1000/200= 5 | 250V/5= 50 V
Winding 2: 1000/100= 10 | 250/10= 25 V
Winding 3: 1000/2000 = 0.5| 250/0.5= 500 V
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Kevin Austin
ELT-306 WA2
3. For a line frequency of 60 Hz, what is the ripple voltage if the load current is 250 mA and the capacitor is 500 F?
𝝁
Vripple=I/2(freq)(capacitor)
250 mA/(120 hz) (500µF)= 4.17
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