input filter design for cpm controlled converters
DESCRIPTION
Input filter design for CPM controlled converters. Reference paper: Y.Jang, R.W.Erickson, " Physical origins of input filter oscillations in current programmed converters ," IEEE Transactions on Power Electronics, Vol.7, No.5, Oct.1992. Physical origins of input-filter oscillations. - PowerPoint PPT PresentationTRANSCRIPT
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Input filter design for CPM controlled converters
• Reference paper:
Y.Jang, R.W.Erickson, "Physical origins of input filter oscillations in current programmed converters," IEEE Transactions on Power Electronics, Vol.7, No.5, Oct.1992.
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Physical origins of input-filter oscillations
Design objective: Gvc should not be affected by the input filter:
• Effects of input filter on Gvd
• Effects of input filter on Gid
• Additional “feed-forward” loop though vg
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Effects of input filter on Gvd
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Effects of input filter on Gid
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Additional loop through vg
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Additional loop through vg
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Computation of Ggd
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Effects of Ggd
vFvFGiGF
Fd vggigcidm
m ˆˆˆ1
ˆ
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Design objective: Gvc should not be affected by the input filter:
• Effects of input filter on Gvd
• Effects of input filter on Gid
• Additional “feed-forward” loop though vg
Design criteria
Do ZZ No ZZ
Nfo ZZ
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Typical buck converter impedance criteria (see the reference paper)
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Experimental example (see the reference paper)
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Input filter oscillations: ZN and ZD
L=2.5mH
Ma=3 M2
D=0.35
R=10
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L=0.275mH
Ma=0
D=0.47
R=25
Close to DCM
Input filter oscillations: ZNf