Circuits Lecture 9: Thevenin and Norton Theorem (2). 李宏毅 Hung yi Lee. Review  Thevenin and Norton Theorem. Two Terminal Network. Thevenin Theorem. Norton Theorem. Review  Thevenin and Norton Theorem. Two Terminal Network. Two Terminal Network. =.
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李宏毅 Hungyi Lee
Two
Terminal
Network
Two
Terminal
Network
=
The same concept is applied on isc.
suppress
Two
Terminal
Network
Two
Terminal
Network
Two
Terminal
Network
suppress
suppress
Find voc
Find isc
Two
Terminal
Network
Two
Terminal
Network
Is it correct?
Negative Communed Power
= Supplied Power

+
reference current should flow from “+” to “”
B
B
A
A

+
reference current should flow from “” to “+”
Ideal sources can supply unlimited power.
Real voltage source =
Ideal voltage source + resistor
iv characters
for real voltage source
Real current source =
Ideal current source  resistor
iv characters
for real current source
power
Device (Load)
Power consumed by Rs
Real source
Power consumed by RL
Rs is fixed, increase RL
Maximum power transfer to (consumed by) a load resistance requires RL = Rs:
(Only 25%)
Power consumed by RL
RL is a variable
Find RL which maximizes PL
When dPL/dRL=0,
PLis maximum
dPL/dRL=0, when Rs=RL
Eff=50%
Audio Amplifier
Signals from
Sound Card
Find a speaker that can gain sufficientpower
http://mingshian.blogspot.tw/2013/05/radioteardown.html
Difficult to compute the power
Input audio signal
Audio Amplifier
http://angelfire.com/ab3/mjramp/index.html
Thevenin Theorem
+

+

+

pRis maximum when dpR/dR=0
+

+

+

Have to find voc
(http://wwwinst.eecs.berkeley.edu/~ee42/sp03/LectNotes/42_05_6.pdf)
Which operating regions?