Automatic Current Limit Strategy for LLC DC-DC Converter for Overload Operation

Xiao Yang; Deshang Sha

doi:10.1109/TPEL.2024.3397621

Automatic Current Limit Strategy for LLC DC-DC Converter for Overload Operation

Xiao Yang, Deshang Sha^*

^*Corresponding author for this work

School of Automation

Beijing Institute of Technology

Research output: Contribution to journal › Article › peer-review

2 Citations (Scopus)

Abstract

LLC dc-dc converter is widely used, but its current suppression under overload operation is a concerned issue. In the previous work, the working conditions in which the switching frequency is lower than the resonant frequency and phase shift (PS) control under overload operation are not mentioned. In this article, comprehensive and universal geometric analysis is given under these conditions. The relationship of resonant current, normalized output voltage, switching frequency and PS angle is analyzed comprehensively in facing various working conditions with state-plane analysis. These analyses can be referenced in researches on controlling the peak value of resonant current. Experimental results are demonstrated on a 300 W LLC converter to verify the effectiveness of the analysis.

Original language	English
Pages (from-to)	9917-9928
Number of pages	12
Journal	IEEE Transactions on Power Electronics
Volume	39
Issue number	8
DOIs	https://doi.org/10.1109/TPEL.2024.3397621
Publication status	Published - 1 Aug 2024

Keywords

LLC resonant converter
phase shift (PS) method
resonant current limiting
state-plane analysis

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10.1109/TPEL.2024.3397621

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title = "Automatic Current Limit Strategy for LLC DC-DC Converter for Overload Operation",

abstract = "LLC dc-dc converter is widely used, but its current suppression under overload operation is a concerned issue. In the previous work, the working conditions in which the switching frequency is lower than the resonant frequency and phase shift (PS) control under overload operation are not mentioned. In this article, comprehensive and universal geometric analysis is given under these conditions. The relationship of resonant current, normalized output voltage, switching frequency and PS angle is analyzed comprehensively in facing various working conditions with state-plane analysis. These analyses can be referenced in researches on controlling the peak value of resonant current. Experimental results are demonstrated on a 300 W LLC converter to verify the effectiveness of the analysis.",

keywords = "LLC resonant converter, phase shift (PS) method, resonant current limiting, state-plane analysis",

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AU - Sha, Deshang

PY - 2024/8/1

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N2 - LLC dc-dc converter is widely used, but its current suppression under overload operation is a concerned issue. In the previous work, the working conditions in which the switching frequency is lower than the resonant frequency and phase shift (PS) control under overload operation are not mentioned. In this article, comprehensive and universal geometric analysis is given under these conditions. The relationship of resonant current, normalized output voltage, switching frequency and PS angle is analyzed comprehensively in facing various working conditions with state-plane analysis. These analyses can be referenced in researches on controlling the peak value of resonant current. Experimental results are demonstrated on a 300 W LLC converter to verify the effectiveness of the analysis.

AB - LLC dc-dc converter is widely used, but its current suppression under overload operation is a concerned issue. In the previous work, the working conditions in which the switching frequency is lower than the resonant frequency and phase shift (PS) control under overload operation are not mentioned. In this article, comprehensive and universal geometric analysis is given under these conditions. The relationship of resonant current, normalized output voltage, switching frequency and PS angle is analyzed comprehensively in facing various working conditions with state-plane analysis. These analyses can be referenced in researches on controlling the peak value of resonant current. Experimental results are demonstrated on a 300 W LLC converter to verify the effectiveness of the analysis.

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KW - phase shift (PS) method

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KW - state-plane analysis

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JO - IEEE Transactions on Power Electronics

JF - IEEE Transactions on Power Electronics

IS - 8

ER -

Automatic Current Limit Strategy for LLC DC-DC Converter for Overload Operation

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Keywords

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