lecture 9: isolated convertersweb.eecs.utk.edu/~dcostine/ece481/fall2013/lectures/l9_out.pdf ·...
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Lecture 9: Isolated Converters
ECE 481: Power ElectronicsProf. Daniel Costinett
Department of Electrical Engineering and Computer ScienceUniversity of Tennessee Knoxville
Fall 2013
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Announcements
• Midterm exam begins at the end of class today– Turn in Thursday, 10/3– You may use extra sheets
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Flyback Ideal Waveforms
MOSFETv,i
t
VLM
t
t
Diode v,i
ILM ILM
0
Vg+V/n
ILM/n
-V-nVg
0Vg
-V/n
tILM-V/R
-V/R
ICO
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Flyback Reverse Recovery
t
t
Diode v,i
ILMILM
0
Vg+V/n
ILM/n
-V-nVg
0VLM Vg
-V/n
ILM-V/R
-V/R
ICO
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Flyback Reverse Recovery
s
rlm
s
rlmg T
QITtDIi
nVDDVv glm
'0
s
rlm
s
rlmco nT
QInTt
RV
nIDi '0
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Large Step Conversion RatioBoost Converter
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 10
50
100
150
200
250
300
350
400
450
500
V/V
g
D
Flyback, n=100
RL/n2R=0.1
RL/n2R=0.05
RL/n2R=0.02
RL/n2R=0.01
RL/n2R=0.005
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Transistor Ratings
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Isolated Converters
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Transformer Saturation
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Buck-Derived Isolated Converters
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