Analysis and implementation of half-bridge resonant capacitance LLC converter

Huang, Yonghong; Liang, Tsorng–Juu; Wu, Wei-Jiun

doi:10.1109/icit.2016.7474943

Cited by 8 publications

(5 citation statements)

References 21 publications

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“…The skin effect, which causes an increase in the resistivity of the copper as the effective conductive area is reduced at higher frequencies, is determined by (21). It contributes to the AC resistance of the round wire as given in (22), where σ is the conductivity, and r is the radius of the copper.…”

Section: Design Methodology For Gapped Core Magneticsmentioning

confidence: 99%

“…The details of the distributed core structure connected in series-parallel are provided in detail in [17] and [18]. In [19], [20], it was shown that using two small transformers instead of a large one increased the power density of the converter by %24.28 [21], [22]. Substantial research and development efforts have been performed on the optimization of high frequency transformers [9]- [15].…”

Section: Introductionmentioning

confidence: 99%

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A New Optimization Method for Gapped and Distributed Core Magnetics in LLC Converter

et al. 2023

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LLC converter design optimization remains a challenging task for varying loads such as in battery chargers. There are numerous L-L-C combinations to choose from a design space that can satisfy the required voltage gains of the application. An accurate magnetic model is essential to optimally size the passive components according to the application needs. This paper provides a new design tool for gapped core magnetics to optimize the transformer and resonant inductor in LLC converters. Unlike conventional design algorithms, the proposed algorithm considers multiple distributed cores and selects the optimal magnetic flux density by minimizing a penalty function that includes power loss, cost and volume of the magnetic components using Big-Bang Big-Crunch Algorithm. The gapped core transformer and inductor design equations have been verified in Ansys Maxwell and Simplorer co-simulation environment for a 3700W 48V LLC and calculated power loss have been compared with experimental results. For the given L m and L r pair of 37.52 µH and 9.38 µH, the proposed magnetic model designed a transformer with twodistributed cores, each one exhibiting a magnetizing inductance of 17.73 µH and leakage inductance of 0.7 µH on a EE422120 with 3F36 material. The total power loss of the transformers are measured as 12.44 W on a 3700 W prototype switched at 350 kHz.INDEX TERMS Big-bang big-crunch algorithm, gapped core magnetics, light electric vehicle, LLC converter, LLC transformer optimization, multi-core LLC transformer.

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Section: Design Methodology For Gapped Core Magneticsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A New Optimization Method for Gapped and Distributed Core Magnetics in LLC Converter

et al. 2023

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“…This converter provides high performance and becomes a good option for high-voltage applications. The topology is highlighted in many studies, for example, the design of LLC topology, analysis, simulation, and optimization of its parameters (Huang et al, 2016;Xu et al, 2017;Rusu et al, 2019;Tian et al, 2020). These converters are mostly preferred due to their higher energy conversion efficiency, high power density, and LLC RPCs.…”

Section: Llc Resonant Convertermentioning

confidence: 99%

Resonant Power Converters for Renewable Energy Applications: A Comprehensive Review

et al. 2022

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Studies on resonant power converters (RPCs) have received much attention due to the rapid growth of their potential in modern power and renewable energy applications such as photovoltaic, electric vehicles, wind, and fuel cells. Consequently, a significant number of studies focusing on RPC topologies for renewable energy applications is available. Generally, these studies have addressed several aspects, such as the development of their soft switching feature, smooth waveforms, high power density, and high efficiency. With this in mind, the present paper aims to review the development of the RPCs, challenges in their development, and comparison between common topologies as highlighted in literature. In addition, the use of RPCs in various applications of renewable energy is highlighted, focusing on some of the recently utilized topologies based on their constructions and achievements. There are still several issues and challenges in research that need to be considered for future improvement of the RPC performance in renewable energy applications. The improvement may require modifications on the circuit design or control strategies.

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“…Very little literature concerned about the situation that f s is less than f r . Since f s range is first established in a converter design process, which is normally set the frequency below 150 kHz as a rule of thumb [32], a small value for f r may occur when f s > f r is taken into account. That means, large values for the resonant capacitor ( C r ) and inductor ( L r ) may be present.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the time‐domain model of the LLC series resonant converter with frequency and single phase shifted control

Guo,

Jia,

Zhang

et al. 2023

IET Power Electronics

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LLC series resonant converter (LLC‐SRC) has attracted much attention due to its simple circuit structure and easy realization of soft‐switching. To get a better efficiency, rectifier stage can be realized by the active switches instead of the diodes. Meanwhile, more control variables can be selected besides the switching frequency, such as single phase shifted (SPS) angle, dual phase shifted (DPS) angle, and extended phase shifted (EPS) angle. Considering the simplicity of the implementation of the control strategy, this paper focused on the converter model with frequency and SPS control. Different from the common modelling method with the Fundamental Harmonic Approximation (FHA), the precise time‐domain mathematic model is built. By a comparison between the two modelling results, it can be proved the FHA model may be failure in some operating condition while the proposed time‐domain model can still show a good accuracy. According to the proposed model, two simple fixed‐frequency SPS control strategies are proposed. The first one can realize infinite soft‐switching margin with no restrictions on the transformer magnetizing inductance. The second one can greatly improve the efficiency of the converter. All the theoretical results are verified by a 1‐kW experiment prototype.

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Analysis and implementation of half-bridge resonant capacitance LLC converter

Cited by 8 publications

References 21 publications

A New Optimization Method for Gapped and Distributed Core Magnetics in LLC Converter

A New Optimization Method for Gapped and Distributed Core Magnetics in LLC Converter

Resonant Power Converters for Renewable Energy Applications: A Comprehensive Review

Analysis of the time‐domain model of the LLC series resonant converter with frequency and single phase shifted control

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