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\begin{document}

\title{A Novel PFM/PWM Hybrid Modulated Single-stage FSBB-LLC AC-DC Converter}



\author[1]{Junhong Yi}%
\author[1]{Hongbo Ma}%
\author[1]{Song Lu}%
\author[1]{Xiaobin Li}%
\author[1]{Zhe Chen}%
\affil[1]{Southwest Jiaotong University School of Electrical Engineering}%


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  \date{June 18, 2024}


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\begin{abstract}
By integrating the Four Switch Buck-Boost (FSBB) PFC and full-bridge LLC
resonant converter, a novel single-stage FSBB-LLC AC-DC converter is
proposed. Moreover, a dual-loop feedback control strategy based on
PFM/PWM hybrid modulation is proposed for obtaining the desired bus
voltage and stable output voltage. The bus voltage feedback loop is
utilized to regulate the bus voltage by selecting the boost or
buck-boost mode; the output voltage feedback loop is employed to
stabilize the output voltage by adjusting the switching frequency or
phase shifting angle. Furthermore, an optimal parameter design based on
power balance principle is also derived. The experimental results of an
85\textasciitilde{}300V input, 12V/25A output prototype demonstrate
that: (1) low and narrow bus voltage of 240\textasciitilde{}340V is
achieved under the entire input and output condition; (2) the LLC cell
operates as a DCX converter over the whole load range as the input
voltage exceeds 120V; (3) the output voltage is well regulated even
under the no-load condition; (4) ZVS feature for the shared main
switches is still maintained; (5) a peak efficiency of 90.9\% and PF
values above 0.987 are achieved.%
\end{abstract}%



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\verb`A Novel PFM-PWM Hybrid Modulated Single-stage FSBB-LLC AC-DC Converter.docx`  available at \url{https://authorea.com/users/586481/articles/624593-a-novel-pfm-pwm-hybrid-modulated-single-stage-fsbb-llc-ac-dc-converter}

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