Input filter design for CPM controlled converters
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Input filter design for CPM controlled converters • Reference paper: Y.Jang, R.W.Erickson, " Physical origins of input filter osci llations in current programmed conver ters ," IEEE Transactions on Power Electronics, Vol.7, No.5, Oct.1992.
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 Presentation
Transcript of Input filter design for CPM controlled converters
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
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
Effects of input filter on Gvd
Effects of input filter on Gid
Additional loop through vg
Additional loop through vg
Computation of Ggd
Effects of Ggd
vFvFGiGF
Fd vggigcidm
m ˆˆˆ1
ˆ
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
Typical buck converter impedance criteria (see the reference paper)
Experimental example (see the reference paper)
Input filter oscillations: ZN and ZD
L=2.5mH
Ma=3 M2
D=0.35
R=10
L=0.275mH
Ma=0
D=0.47
R=25
Close to DCM
Input filter oscillations: ZNf
