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A Controllable LCL-T Resonant AC/DC Converter for High Frequency Power Distribution Systems

Zeng, Jun;Li, Xuesheng;Liu, Junfeng

  • Received : 2014.11.24
  • Accepted : 2015.03.10
  • Published : 2015.07.31

Abstract

High frequency alternating current (HFAC) has been widely used in a wide range of power distribution systems (PDS) due to its superior performance. A high frequency AC/DC converter plays the role of converting HFAC voltage to DC voltage. In this paper, a new LCL-T resonant AC/DC converter has been proposed, and an easier control method based on input voltage comparison is presented, without the complicated calculation of the zero-crossing point. Both a low distortion and near-to-unity power factor can be achieved by the proposed resonant converter and control strategy. The operational principle and steady-state analysis are given for the proposed resonant converter. A simulation model and experimental prototype are implemented with an operation frequency of 25kHz and a rated power of 20W. The simulation and experimental results verify the accuracy of the analysis and the excellent performance of the proposed topology.

Keywords

AC/DC converter;Controllable resonant converter;High frequency alternating current (HFAC)

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