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

Mangesh Borage; K. V. Nagesh; M. S. Bhatia; Sunil Tiwari

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

Vol. 12, No. 2, pp. 317-325, Mar. 2012

10.6113/JPE.2012.12.2.317

Current supplies

Equivalent Circuit

Immittance Converters

Resonant power conversion

Soft-switching

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Abstract

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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Cite this article

[IEEE Style]

M. Borage, K. V. Nagesh, M. S. Bhatia, S. Tiwari, "Approximate Equivalent-Circuit Modeling and Analysis of Type-II Resonant Immittance Converters," Journal of Power Electronics, vol. 12, no. 2, pp. 317-325, 2012. DOI: 10.6113/JPE.2012.12.2.317.

[ACM Style]

Mangesh Borage, K. V. Nagesh, M. S. Bhatia, and Sunil Tiwari. 2012. Approximate Equivalent-Circuit Modeling and Analysis of Type-II Resonant Immittance Converters. Journal of Power Electronics, 12, 2, (2012), 317-325. DOI: 10.6113/JPE.2012.12.2.317.