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Transcript
```‫بسم هللا الرحمن الرحيم‬
The Islamic University of Gaza
Faculty of Engineering
Electrical Engineering Department
POWER ELECTRONICS
EELE 5450 — Fall 2009-2010
Instructor: Eng.Moayed N. EL Mobaied
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.
(Efficiently usually means greater than 80% – 90%)
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 antiparallel 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 Converter
Chapter One
DC-to-AC Converter
Chapter One
DC-to-AC Converter
Chapter One
DC-to DC Converter
Chapter One
AC-to AC Converter
Chapter One
Line Commutated Inverter
H.W#1
H.W#1
In no more than one page :
• Toyota Plug-in Hybrid car in 2010.
End of Lecture **** Eng.moayed
```
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