A Five-Element Multiplex Resonant Full-Bridge DC-DC Converter with a Variable Inductive Reactance

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  • 可変誘導性リアクタンス機能を持つ5エレメント多重共振形DC-DCコンバータ
  • カヘン ユウドウセイ リアクタンス キノウ オ モツ 5 エレメント タジュウ キョウシンケイ DC-DC コンバータ

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Abstract

A five element multiplex resonant (LLCLC) full-bridge DC-DC converter controlled by pulse-frequency-modulation (PFM) is proposed in this paper. The high frequency (HF)-link resonant DC-DC converter proposed herein can perform wide-range output power and voltage regulations with a narrow frequency range owing to an anti-resonant tank which works effectively as a wide-range variable inductor. The advantageous characteristics of the anti-resonant tank provide overcurrent protection in the case of the short-circuited load condition as well as the start-up interval, thus the technical challenges of the conventional LLC DC-DC converter can be overcome, and the reliability of the relevant switch-mode power supplies can be improved. The operating principle of the LLCLC DC-DC converter is described, after which its performance is evaluated in an experimental setup based on the 2.5kW prototype. Finally, the feasibility of the proposed DC-DC converter is discussed from the practical point of view.

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