Power Electronics
An overview
3/13/2023
Dr Ehab Elwakil
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Course outlines
• Revision of semiconductor physics
• Definition of power electronics
• Power semiconductor switches:
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Power diode
Power BJT
Power Thyristor
Thyristor commutation circuits
Power Rectifier circuits (controlled / uncontrolled)
AC voltage controllers
Power Inverters & Pulse width modulation (PWM)
DC / DC Converters and switched mode power supplies
Dr Ehab Elwakil
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Marks and course work
• Full mark
• Course work
• Final exam
3/13/2023
150 marks
50 𝑟𝑒𝑝𝑜𝑟𝑡𝑠, 𝑠ℎ𝑒𝑒𝑡𝑠 𝑎𝑛𝑑 𝑞𝑢𝑖𝑧𝑧𝑒𝑠
60 marks
10 𝑙𝑎𝑏 𝑎𝑛𝑑 𝑠𝑖𝑚𝑢𝑙𝑎𝑡𝑖𝑜𝑛 𝑤𝑜𝑟𝑘.
90 marks
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What is power Electronics
•It is the application of solid state
electronics in the control and
conversion of electric power
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Power Electronic System
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Power Electronics Applications
•Domestic Applications
• Refrigeration and Freezers
• Heating
• Air Conditioning
• Cooking
• Lighting (ballasts and dimmers)
• Personal Computers
• Other entertainment equipments
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Power Electronics Applications
• Commercial Applications
• Ventilating
• Central air conditioning
• Central heating
• Central Refrigeration
• Lighting
• Elevators
• Office equipments
• Uninterruptible Power Supplies(UPS)
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Power Electronics Applications
•Industrial Applications
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Pumps
Compressors
Fans
Blowers
Machine Tools
Induction Heating
Welding
Robotics
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Power Electronics Applications
•Transportation
•Traction Control of electric vehicles / trains
•Battery chargers
•Electric subway / trolley buses / street cars
•Control of modern combustion engine cars
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Power Electronics Applications
•Utility Systems
• High voltage DC (HVDC) transmission
• Power Factor Correction
• Active Filters
• Static VAR Compensation
• Energy Storage system for wind and PV
stations
• Boiler feed water for steam stations
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Power Electronics Applications
•Aerospace
•Space shuttle power system
•Satellite power system
•Aircraft power system
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Power Electronics Applications
•Telecommunication
•Battery chargers
•DC/DC power supplies
•UPS
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Interdisciplinary nature of power electronics
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Power Semiconductor Switches
•The key element of any power electronic
circuit, is the power semiconductor switch
•Power semiconductor switch is similar in
function to the signal level switch but they
are different in construction, characteristics,
ratings, and applications
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Power Diode
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Power Diode
Switching Characteristics
V-I Characteristics
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Power Diode Applications
• Uncontrolled Rectifier Circuits
• Freewheeling diodes
• HVDC transmission
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Power Bipolar Junction Transistor
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Power Bipolar Junction Transistor
V-I Characteristics
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Switching Characteristics
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Power BJT Applications
• Power Inverters
• DC / DC converters
• Dynamic braking of induction motors
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Power Thyristors
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Power Thyristors
Switching Characteristics
V-I Characteristics
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Power Thyristors applications
• Controlled rectifier circuits (half / full)
• Drive circuits of AC motors
• AC voltage controllers
• Power inverters
• Heating
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Power MOSFET
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Power MOSFET
V-I Characteristics
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Switching Characteristics
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Power MOSFET applications
• Switched mode power supplies
• High frequency DC/DC choppers
• Resonant converters
• High frequency inverters
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Power IGBT
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Power IGBT
V-I Characteristics
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Switching Characteristics
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Power IGBT applications
•Almost the same as MOSFET
transistor but for:
• higher power ratings and
•less than 100 kHz switching
frequency applications
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Power and frequency capabilities
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Read more about power semiconductor
switches
• Power Gate Turn Off (GTO) Thyristor
• Power Diac
• Power Triac
• Fast and fast recovery diodes
• Power JFET (static induction) transistors
• MOS controlled Thyristors (MCT)
• Smart power circuits (high voltage IC’s)
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References
• Ned Mohan, M. Undeland, P. Robbins, “Power Electronics: Converters,
Applications, and Design”
• Cyril W. Lander, “Power Electronics”
• Barry W. Williams, “Power Electronics: Devices, Drivers, Applications,
and Passive Components”
• M. H. Rashid “Power Electronics: Circuits, Devices, and Applications”
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Homework
• Chapter 19, Ned Mohan, “Basic Semiconductor Physics”, read
about the following:
• Semiconductors
• Doping
• Breakdown voltage
• Thermal ionization
• Majority and minority carriers
• Recombination
• Drift and diffusion
• Space charge and free charge
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•Thank You
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