Low-Loss Integrated Inductor and Transformer Structure and Application in Regulated LLC Converter for 48-V Bus Converter

Ahmed, Mohamed H.; Nabih, Ahmed; Lee, Fred C.; Li, Qiang

doi:10.1109/jestpe.2019.2952878

Cited by 71 publications

(16 citation statements)

References 14 publications

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“…The transformer needs a large turns ratio and it suffers the total voltage conversion pressure. Besides, due to package and thermal constraints, it is necessary to connect synchronous rectifiers (SRs) in parallel, which is difficult to arrange close to the terminal, and causes large leakage inductance and winding losses as well [15]- [16]. To deal with this issue, the transformer can be split into several smaller ones.…”

Section: A Transformer-based Llc Convertersmentioning

confidence: 99%

Review of High-Frequency High-Voltage-Conversion-Ratio DC–DC Converters

Guan

Cecati

Alonso

et al. 2021

IEEE J. Emerg. Sel. Top. Ind. Electron.

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Section: A Transformer-based Llc Convertersmentioning

confidence: 99%

Review of High-Frequency High-Voltage-Conversion-Ratio DC–DC Converters

Guan

Cecati

Alonso

et al. 2021

IEEE J. Emerg. Sel. Top. Ind. Electron.

View full text Add to dashboard Cite

show abstract

“…There are many methods, which can be used to integrate the magnetic components of the LLC resonant converter. The core of the transformer can be manipulated or an extra core can be added to one of transformer windings to merge either the primary winding or secondary winding with the winding of the series inductor [10][11][12][13][14][15][16]. However, this approach requires a new unusual type of core for each design, leading the design process to lower flexibility and higher cost.…”

Section: Introductionmentioning

confidence: 99%

Fully-Integrated Planar Transformer With a Segmental Shunt for LLC Resonant Converters

Ansari

Davidson

Foster

2022

IEEE Trans. Ind. Electron.

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This paper presents two topologies which provide high leakage inductance in shunt-inserted integrated magnetic transformers. These differ from conventional designs by replacing the low-permeability magnetic shunt of a planar transformer with highpermeability magnetic shunt segments, separated by many small air gaps. This approach results in a shunt with the same bulk permeability as the conventional design, while using lower cost and readily available magnetic materials such as ferrite. A modelling and design approach which can estimate the leakage and magnetising inductances precisely is provided for each topology. Theoretical analysis is presented and verified using finite-element analysis and experimental implementation. AC resistance analysis for both transformer topologies is also presented. In addition, an LLC resonant converter is built to verify the performance of the proposed fully-integrated magnetic transformers in practice. It is shown that the proposed topologies can integrate all three magnetic components of an isolated LLC resonant converter in a single planar transformer, which reduces the converter's volume and cost.

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“…This work was supported by the Engineering and Physical Sciences Research Council (EPSRC) under grant EP/S031421/1. transformer and inductor cores [13][14][15][16]. In this structure, the winding of the series inductor is coiled around one leg of transformer core and primary and secondary windings are on other legs.…”

Section: Introduction Ard-switchedmentioning

confidence: 99%

Fully-Integrated Solid Shunt Planar Transformer for LLC Resonant Converters

Ansari

Davidson

Foster

2022

IEEE Open J. Power Electron.

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A new topology for achieving high leakage inductance in inserted-shunt integrated magnetic planar transformers is proposed. In the proposed topology, two one-segment shunts are placed across the planar E-core air gap and between the primary and secondary windings. The proposed topology benefits using solid inexpensive ferrite shunts, making manufacturing easier. A detailed mathematical model is derived from which a design methodology is developed, providing accurate estimation for the leakage and magnetising inductances. The theoretical analysis has been verified using finite-element analysis and experimental implementation. AC resistance analysis and efficiency comparison are also presented for the proposed topology and a recent topology with inserted-segmental-shunt, which shows the proposed topology provides higher efficiency because of lower AC resistance. In addition, an isolated LLC resonant converter is designed and built to investigate the performance of the proposed topology in practice. The three magnetic components needed for the designed LLC resonant converter is integrated in a single planar transformer using the proposed topology and the converter operates properly.

show abstract

Low-Loss Integrated Inductor and Transformer Structure and Application in Regulated LLC Converter for 48-V Bus Converter

Cited by 71 publications

References 14 publications

Review of High-Frequency High-Voltage-Conversion-Ratio DC–DC Converters

Review of High-Frequency High-Voltage-Conversion-Ratio DC–DC Converters

Fully-Integrated Planar Transformer With a Segmental Shunt for LLC Resonant Converters

Fully-Integrated Solid Shunt Planar Transformer for LLC Resonant Converters

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