Power Electronics
Lecture # 1
Dr. Hany S. E. Mansour
Electrical Engineering Department, Faculty of Engineering, Suez Canal University
Email: hany_salem@eng.suez.edu.eg
Phone: 010 243 27 200
Dr. Hany S. E. Mansour
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Contents
Chapter one: Introduction to Power Electronics
Chapter Two: Uncontrolled Rectifiers
Chapter Three: Controlled Rectifiers
Chapter Four: Choppers
Chapter Five: Inverters
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References
1. Daniel W. Hart, “Power Electronics”, McGraw-Hill, 2016.
2. Muhammad H. Rashid, Narendra Kumar, Ashish R. Kulkarni,
“Power Electronics Devices, Circuits, and Applications”, 5th edition.
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Assessment
Project
Tasks (Matlab & Sheets)
Midterm Exams
Quiz
Lab Exam
Presentation
Final Exam
Total
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5
20
5
5
5
50
100
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Introduction
➢ Power electronics may be defined as the application of solid-state electronics
for the control and conversion of electric power.
• To convert electrical energy from one to another, i.e. from the source to
load with:
▪ highest efficiency
▪ highest availability and reliability
▪ lowest cost
▪ smallest size
▪ least weight
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Power electronic applications
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Converter types
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Power Diodes
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Power Diodes
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Power Diodes
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Power Diodes
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Power Diodes
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Power Diodes
The Ideal Diode Model
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Power Diodes – Diode Characteristics
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Power Diodes – Diode Characteristics
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Power Diodes – Diode Characteristics
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Power Diodes – Diode Characteristics
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Power Diodes – Diode Characteristics
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Power Diodes – Diode Characteristics
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Power Diodes – Diode Characteristics
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Power Diodes – Diode Characteristics
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Example
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Reverse recovery characteristics
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Reverse recovery characteristics
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Reverse recovery characteristics
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Reverse recovery characteristics
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Reverse recovery characteristics
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Example
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Parameters determine the selection of a power diode
➢Rated current and voltage
➢Maximum (peak) current & corresponding application time
➢Forward voltage drop
➢Peak Reverse Voltage
➢Reverse Recovery time & charge
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Power diode types
➢ Ideally, a diode should have no reverse recovery time. However, the manufacturing cost of
such a diode may increase.
➢ In many applications, the effect of reverse recovery time is not significant → inexpensive
diode can be used.
➢ Depending on:
▪ The recovery characteristics and
▪ Manufacturing techniques,
The power diodes can be classified into three categories:
1- Standard or general-purpose diodes
2- Fast-recovery diodes
3- Schottky diodes
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Power diode types – Standard or general-purpose diodes
➢The general-purpose diodes have relatively high reverse recovery time, typically
25 𝜇s.
➢Used in low frequency applications (< 1 kHz) such as line commutated
converters.
➢Ratings: up to 9 kV and 8 kA.
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Power diode types – Fast-recovery diodes
➢The fast recovery diodes have low recovery time, normally 2 𝜇s.
➢They are used in dc-dc and dc-ac converter circuits, where the speed of recovery
is often of critical important.
➢Its rating are slightly lower than general-purpose diodes.
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Power diode types – Schottky diodes
➢The recovery charge of a Schottky diode is much less than that of a pn junction
diode.
➢A Schottky diode has a relativity low forward voltage drop → efficiency is
increased.
➢A Schottky diode with relatively low-conduction voltage has relatively high
leakage current and vice versa.
➢Voltage rating of this diode is limited to 100 V and current rating < 400 A.
➢The Schottky diode are ideal for high-current and low-voltage dc power supplies.
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Power diode types
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