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‫بسم هللا الرحمن الرحيم‬
The Islamic University of Gaza
Faculty of Engineering
Electrical Engineering Department
POWER ELECTRONICS
EELE 5450 — Summer 2012
Instructor: Eng. Jalal Al Roumy
Lecture 2
Chapter One
Question: What are power electronic devices?
Answer: Fast switches that can handle high voltages and
currents
Question: Why do we need these fast switches?
Answer: To efficiently convert AC to DC, DC to DC, or
DC to AC, or to efficiently control average power flow.
Chapter One
A switch
Rugged, reliable, efficient, long lived, but not very fast
Chapter One
The ideal power electronic device is a perfect switch that
 is fast − can open and close instantly (thus no switching losses), and at a
high rate (i.e., operating frequency)
 when closed, can conduct any amount of current with no internal voltage
drop (thus no conduction losses)
 when open, will conduct no current and can withstand any voltage without
breakdown
 will be unidirectional or asymmetric (that is an inherent property of power
electronic devices, and we can always place two switches in anti-parallel and
use blocking diodes to prevent backward conduction)
Chapter One
A Review of Power electronics Applications
Chapter One
Chapter One
Chapter One
Chapter One
Chapter One
AC-to DC Converter
Chapter One
AC-to DC Converter
Chapter One
AC Voltage Controllers
Chapter One
AC Voltage Controllers
Chapter One
DC-to AC Inverters
Chapter One
DC-to AC Inverters
Chapter One
DC-to AC Inverters
Chapter One
DC-to-AC Inverter
Chapter One
DC-to-AC Inverter
Chapter One
DC-to DC Chopper
Chapter One
AC-to AC Converter
Chapter One
Line Commutated Inverter
H.W#1
H.W#1
In no more than one page :
• BMW i8 (Plug-in Hybrid car)
End of Lecture