Analysis and Design of the <i>LLC</i> Resonant Converter With Variable Inductor Control Based on Time-Domain Analysis

Wei, Yuqi; Luo, Quanming; Du, Xiong; Altın, Necmi; Alonso, J.M.; Mantooth, H. Alan

doi:10.1109/tie.2019.2934085

Cited by 88 publications

(26 citation statements)

References 22 publications

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“…For TDA, the circuit state equations are developed based on the time-domain resonant waveforms, law of charge conservation, and conservation of energy [24]; the analytical solutions of the circuit variables can be derived by solving the circuit state equations, which requires sophisticated software, such as MATLAB. For LLC resonant converter, it has the following three subintervals as shown in Fig.…”

Section: Analysis Methodology For Tdamentioning

confidence: 99%

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Comprehensive comparisons between frequency‐domain analysis and time‐domain analysis for LLC resonant converter

Wei

Luo

Mantooth³

2020

IET Power Electronics

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LLC resonant converter has been widely used in many applications due to its characteristics of high efficiency and high frequency characteristics. Analysis method plays great role in converter design and operation performance. For LLC resonant converter, the most frequently used analysis methods are frequency-domain analysis (FDA) and time-domain analysis (TDA). FDA assumes that only fundamental harmonics can deliver energy in the system, while TDA is obtained by solving circuit state equations. In this study, comprehensive and complete comparisons between FDA and TDA in terms of analysis methodology, parameter design, analysis accuracy, conduction loss, other power losses, and system efficiency are implemented. The analysis and comparison results show that under the same system specifications, by adopting TDA, a larger magnetising inductance value can be used when compared with FDA, which will reduce the resonant tank circulating current and increase the system efficiency. The comprehensive analysis can provide guidance for engineers when analysing and designing LLC resonant converter. Finally, a 200 W experimental prototype was built and tested to verify the theoretical analysis.

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Section: Analysis Methodology For Tdamentioning

confidence: 99%

“…For LLC resonant converter, when the input voltage or output power changes, the converter operation mode may change, and boundaries exist among different operation modes. The details regarding the boundary conditions for different operation modes can be found in [18][19][20]24].…”

Section: Analysis Methodology For Tdamentioning

confidence: 99%

Comprehensive comparisons between frequency‐domain analysis and time‐domain analysis for LLC resonant converter

Wei

Luo

Mantooth³

2020

IET Power Electronics

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“…For the magnetically controlled LLC resonant converter, the relationshipbetween the voltage gain and the variable resonant inductor L r should be found, so equation (7) can be expressed as (8) Please note that the parameter a, b, c, and d can be found according to (7). The relationship between the voltage gain, variable resonant inductor, magnetizing inductor, and resonant capacitor should be investigated.…”

Section: B Voltage Gainmentioning

confidence: 99%

Comprehensive Analysis and Design of LLC Resonant Converter With Magnetic Control

Wei¹,

Luo²,

Mantooth³

2019

CPSS TPEA

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Conventionally, LLC resonant converter adopts frequency control (FC) or combine FC with phase shift control (PSC) to regulate the output voltage. However, for both control strategies, a variable switching frequency operation range is required, which makes the magnetic component and driver circuit design complicated. In this paper, the magnetic control (MC) or variable inductor control is adopted for the LLC resonant converter. Thanks to MC, constant switching frequency and duty cycle can be implemented for the primary switches. A comprehensive analysis of the magnetically controlled LLC resonant converter is presented, which includes the operation principle, voltage gain, and soft switching operation. Meanwhile, a design methodology for LLC resonant converter with MC is proposed, especially the design considerations for the variable inductor are discussed. By adopting the proposed design methodology, the zero voltage switching (ZVS) operation for the primary switches and the zero current switching (ZCS) operation for the secondary rectifier can be achieved. Finally, a 200 W experimental setup is built to validate the theoretical analysis.

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“…To solve the above‐mentioned problems, many different approaches have been proposed. Generally, the existing solutions can be categorised into the following three groups: (i) accurate design methodologies [10–13]; (ii) hybrid modulation strategies [14–20]; (iii) modifications on traditional LLC topology [21–25] or topology morphing control strategy [26–29].…”

Section: Introductionmentioning

confidence: 99%

Wide voltage gain range application for full‐bridge LLC resonant converter with narrow switching frequency range

Wei

Luo

Wang

et al. 2020

IET power electron.

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Analysis and Design of the LLC Resonant Converter With Variable Inductor Control Based on Time-Domain Analysis

Cited by 88 publications

References 22 publications

Comprehensive comparisons between frequency‐domain analysis and time‐domain analysis for LLC resonant converter

Comprehensive comparisons between frequency‐domain analysis and time‐domain analysis for LLC resonant converter

Comprehensive Analysis and Design of LLC Resonant Converter With Magnetic Control

Wide voltage gain range application for full‐bridge LLC resonant converter with narrow switching frequency range

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