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Full-Range Soft-Switching Isolated Buck-Boost Converters With Integrated Interleaved Boost Converter and Phase-Shifted Control Abstract: A new method for deriving isolated Buck-Boost (IBB) converter with single-stage power conversion is proposed in this paper, and novel IBB converters based on high-frequency bridgeless interleaved Boost rectifiers are presented. The semiconductors, conduction losses and switching losses are reduced significantly by integrating the interleaved Boost converters into the full-bridge diode-rectifier. Various high-frequency bridgeless Boost rectifiers are harvested based on different types of interleaved Boost converters, including conventional Boost converter and high step-up Boost converters with voltage multiplier and coupled inductor. The full-bridge IBB converter with voltage multiplier is analyzed in detail. The voltage multiplier helps to enhance the voltage gain and reduce the voltage stresses of the semiconductors in the rectification circuit. Hence, a transformer with reduced turns ratio and parasitic parameters, and low-voltage rated MOSFETs and diodes with better switching and conduction performances can be applied to improve the efficiency. Moreover, optimized phase-shift modulation strategy is applied to the full-bridge IBB converter to achieve isolated Buck and Boost conversion. What’s more, soft-switching performance of all of the active switches and diodes within the whole operating range is achieved. A 380V output prototype is fabricated to verify the effectiveness of the proposed IBB converters and its control strategies. Existing system: Voltage step-down can be implemented with an isolated Buck converters, and the efficiency decreases with the decreasing of the voltage conversion ratio. Contrarily, voltage step-up is achieved with an isolated Boost converters, and the efficiency decreases with the increasing of the voltage conversion ratio. Therefore, the isolated Buck or Boost converters are not flexible in terms of conversion efficiency and voltage range. Proposed system: The major contribution of this paper is to propose novel IBB converters with single-stage power conversion based on integration of non-isolated interleaved Boost converters and isolated Buck converters. Novel IBB converters are harvested. Moreover, optimized phase-shift modulation strategy is presented and applied to the proposed converter to achieve soft-switching operation of all of the switching devices within the entire operating range. Circuit diagram: Reference: [1] G. Di Capua, S.A. Shirasavar, M.A. Hallworth, N. Femia, “An enhanced model for small-signal analysis of the phase-shifted full-bridge converter,” IEEE Trans. Power Electronics, vol. 30, no. 3, pp. 1567-1576, Mar. 2015. [2] Z. Guo, D. Sha, X. Liao, “Input-series-output-parallel phase-shift full-bridge derived DC-DC converters with auxiliary LC networks to achieve wide zero-voltage switching range,” IEEE Trans. Power Electronics, vol. 29, no. 10, pp. 508-513, Oct. 2014. [3] H. Wu, Y. Xing, “Families of forward converters suitable for wide input voltage range applications,” IEEE Trans. Power Electronics, vol. 29, no. 11, pp. 6006-6017, Nov. 2014. [4] Y. Wang, W. Liu, H. Ma, L. Chen, “Resonance analysis and soft-switching design of isolated boost converter with coupled inductors for vehicle inverter application,” IEEE Trans. Power Electronics, vol. 30, no. 3, pp. 1383-1392, Mar. 2015.