Thevenin vs. Norton - 921&88數位典藏|921&88 … theorem...
Transcript of Thevenin vs. Norton - 921&88數位典藏|921&88 … theorem...
TheveninThevenin vs. Nortonvs. Norton
2012411
TheveninTheveninEquivalent CircuitEquivalent Circuit
NortonNortonEquivalent CircuitEquivalent Circuit
TheveninThevenin theoremtheorem
TheveninThevenin18831883
EEThThRRThTh
Norton theoremNorton theorem19261926HauseHause--
SiemensSiemens
IInnRRNN
RRThTh
RRThTh
EEThTh1/21/2
EEThTh
EEThTh2/22/2
RRNN==RRThTh
RRNN
75.3R//)RR(R 321N
iiNN1/21/2
iiSCSCiiNN
iiNN2/22/2
A667.215
V40RR
Ei21
N
A143.1RR
RiiLN
NNL
General MethodGeneral Method
Is
IL
A143.1RR
RII
A286.2REI
5.17RR)R//R(R
L3
3SL
TS
213LT
Source ConversionSource Conversion
RRNN==RRThTh
NNThTh
ThN RiER
Ei
Application Application 1/21/2
TheveninTheveninNortonNorton
Application Application 2/22/2
RTH = RN = ETHIN
ammetervoltmeter
15
Experimental Determination of Experimental Determination of TheveninTheveninand Norton Equivalentsand Norton Equivalents
TH
mSCN
Rr1II
16
Experimental Determination of Experimental Determination of TheveninTheveninand Norton Equivalentsand Norton Equivalents
m
THOCTH
rR1VE
17
ExampleExample
mSC
OC
N
THTH
TH
mSCN
OCTH
rIV
IER
Rr1II
V5.6VE
The unknown circuit is replaced by its Theveninequivalent.
Measured VOC=6.5V Measured ISC=3.75mA rm=15
Maximum Power TransferMaximum Power Transfer
supplysupply RRL L = = RRThTh supplysupply
RL=0.5RTh RL=1.5 RThPower
Exercise 20 Exercise 20 TheveninThevenin networknetwork
RTH
333.1R//)R//R(R 321TH
ETH
ETH
I3
A1985.26.9V21
REI
6.9R)R//R(R
Ts
123T
V5.3RIE
A4375.0RR
RII
33TH
32
2S3
IS
Thvenin Network
333.1RTH
V5.3ETH
W721.1RIP
A656.0)4333.1(
V5.3RR
EI
L2
L
LTH
THL
Exercise 21 Exercise 21 TheveninThevenin networknetwork
SolutionSolution
W721.1RIP
A656.0)4333.1(
V5.3RR
EI
L2
L
LTH
THL
RRL L = R= RTH TH = 1.333= 1.333
W297.2R4
ER4
EW297.2RIP
A3125.1)333.1333.1(
V5.3RR
EI
TH
2TH
L
2TH
L2
L
LTH
THL
Exercise 22 Exercise 22 TheveninThevenin networknetwork
,
RTH
8R//)R12(R 32TH
ETH
ETH
V38RR12
R)E'E(E32
3TH
Thvenin Network
38V
8
RRL L = R= RTH TH = 8= 8
W125.45R4
ER4
EPTH
2TH
L
2TH
max