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

作者：Mishima Tomokazu^*; Mizutani Hiroto; Nakaoka Mutsuo

来源：Electrical Engineering in Japan, 2017, 201(1): 66-80.

DOI：10.1002/eej.22990

• resonant DC-DC converter
• high frequency (HF)-link
• multiplex resonance
• pulse frequency modulation (PFM)
• zero voltage soft switching (ZVS)
• zero current soft switching (ZCS)

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 regulation with a narrow frequency range due to an antiresonant tank that works effectively as a wide-range variable inductor. The advantageous characteristics of the antiresonant tank provide overcurrent protection in the case of the short-circuited load condition as well as in the startup interval. Thus, the technical challenges of a 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 2.5 kW prototype. Finally, the feasibility of the proposed DC-DC converter is discussed from a practical point of view.

• 出版日期2017-10