LLC Charger Using Quasi-Contactless Power Transfer by Resonant Magnetic Induction Coupling

In this paper, a quasi-contactless (QC) power transfer by LLC resonance through resonant inductive power transfer is proposed. The proposed method has effectively performed the power transfer only requires for the proper adjustment of primary-side resonances, without any additional complexity associated with the consideration of secondary-side resonances, and comparative ease of use, achieving high efficiency and low cost. A movable-and-separable matrix core set (MCS) is built to form a transformer for the LLC charger, including a primary MCS set for transmitter (TX) and a secondary MCS set for receiver (RX). Both TX and RX transformer will perform QC power transfer via RMIC coupling. Ways to distribute the input power into the subwinding of the TX-MCS and to share the output currents by subwinding of the RX-MCS are explored, which certainly expands the coupling area as well as mitigates the loss in the MCS; especially reducing the circulation magnetizing current via the power switches. Two kinds of charging strategies, including a constant current (CC)-plus-variable current mode for full charging by constant frequency control and a CC mode for fast charging by variable frequency control are, respectively, investigated. Two kinds of the LLC chargers, 450 W and 1.25 kW, are designed to assess the performance of the proposed charging modes, respectively.


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  • Accession Number: 01679167
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jun 7 2018 11:02AM