Adaptive link voltage variation (ALVV) control for high power density adapter

Achieving high efficiency and high power density is emerging as a goal in many power electronics applications. LLC resonant converter has been proved as an excellent candidate to achieve this goal. To achieve smaller size of passive components, the resonant inductor in the LLC converter is usually integrated into the transformer by utilizing its leakage inductance. However, the leakage inductance of transformer is usually insufficient and thus the LLC converter has to be operated in a limited frequency range (this limits the input voltage range accordingly), otherwise the power efficiency will drop dramatically. Therefore, a larger resonant inductance in the LLC converter is expected to operate in a wider input voltage range. This paper proposes a new method to create a larger resonant inductance by using a magnetic shunt integrated into planar windings. The accurate leakage inductance modelling, calculation and optimal design guideline for LLC planar transformer, including optimal magnetic shunt selection and winding layout, are presented. A 280-380V input and output 48V-100W half bridge LLC resonant converter with 1MHz resonant frequency is built to verify the design methodology. A comparison is made between two converters with the same parameters, one using magnetic shunt integrated transformer and the others using traditional planar transformer and external inductor. Experimental result shows the proposed converter with magnetic shunt is capable to achieve comparable high efficiency and regulation capability with the other under a wide input voltage, which verify the optimal design methodology. Above all, this magnetics integration methodology reduces the whole converter's volume and thus increases the power density. Index Terms-magnetic shunt, LLC resonant converter, planar transformer, high frequency, wide input voltage.

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“…Combining 7, (10), (11), (12) and 17, the total leakage inductance referred to the primary side for the above shuntinserted transformer is…”

Section: Leakage Inductance Created By Magnetic Shuntmentioning

confidence: 99%

High-Frequency <italic>LLC</italic> Resonant Converter With Magnetic Shunt Integrated Planar Transformer

Ouyang

Andersen

2019

IEEE Trans. Power Electron.

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Load sharing characteristic of two-phase interleaved LLC resonant converter with parallel and series input structure

Kim

Park

Kim

et al. 2009

2009 IEEE Energy Conversion Congress and Exposition

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Recently, the LLC series resonant converter (LLC-SRC) is widely used for many applications because it has many advantages over other power converters. To apply LLC-SRC to high current application, it is necessary to interleaved operation to reduce output current ripple. Moreover, output current should be shared equally. However, active load share technique cannot be applied to output current divide equally because LLC SRC is regulated with frequency. Therefore, design of multi-phase interleaved LLC SRC is required that load current haring can be realized automatically. In this paper, two structures for interleaved LLC SRC are suggested. In the point of load share, two structures are analyzed. In order to verify proposed analyze, the laboratory experiments are executed and discussed with a 480W prototype.

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Analysis and design of LLC resonant converter considering rectifier voltage oscillation

Park

Kim

Lee

et al. 2009

2009 IEEE Energy Conversion Congress and Exposition

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Adaptive link voltage variation (ALVV) control for high power density adapter

Cited by 5 publications

References 6 publications

High-Frequency <italic>LLC</italic> Resonant Converter With Magnetic Shunt Integrated Planar Transformer

High-Frequency <italic>LLC</italic> Resonant Converter With Magnetic Shunt Integrated Planar Transformer

Load sharing characteristic of two-phase interleaved LLC resonant converter with parallel and series input structure

Analysis and design of LLC resonant converter considering rectifier voltage oscillation

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