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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.

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Input filter design for CPM controlled converters

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  1. 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.

  2. 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

  3. Effects of input filter on Gvd

  4. Effects of input filter on Gid

  5. Additional loop through vg

  6. Additional loop through vg

  7. Computation of Ggd

  8. Effects of Ggd

  9. Design criteria • 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

  10. Typical buck converter impedance criteria (see the reference paper)

  11. Experimental example(see the reference paper)

  12. Input filter oscillations: ZN and ZD L=2.5mH Ma=3 M2 D=0.35 R=10

  13. Input filter oscillations: ZNf L=0.275mH Ma=0 D=0.47 R=25 Close to DCM

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