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Approximate Equivalent-Circuit Modeling and Analysis of Type-II Resonant Immittance Converters

  • Borage, Mangesh (Raja Ramanna Centre for Advanced Technology) ;
  • Nagesh, K.V. (Bhabha Atomic Research Centre) ;
  • Bhatia, M.S. (Bhabha Atomic Research Centre) ;
  • Tiwari, Sunil (Raja Ramanna Centre for Advanced Technology)
  • 투고 : 2011.08.30
  • 발행 : 2012.03.20

초록

Resonant immittance converter (RIC) topologies can transform a current source into a voltage source (Type-I RICs) and vice versa (Type-II RICs), thereby making them suitable for many power electronics applications. RICs are operated at a fixed frequency where the resonant immittance network (RIN) exhibits immittance conversion characteristics. It is observed that the low-frequency response of Type-II RINs is relatively flat and that the state variables associated with Type-II RINs affect the response only at the high frequencies in the vicinity of the switching frequency. The overall response of a Type-II RIC is thus dominated by the filter response, which is particularly important for the controller design. Therefore, an approximate equivalent circuit model and a small-signal model of Type-II RICs are proposed in this paper, neglecting the high-frequency response of Type-II RINs. While the proposed models greatly simplify and speed-up the analysis, it adequately predicts the open-loop transient and small-signal ac behavior of Type-II RICs. The validity of the proposed models is confirmed by comparisons of their results with those obtained from a cycle-by-cycle simulation and with an experimental prototype.

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참고문헌

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