A novel three-phase LLC resonant converter with integrated magnetics for lower turn-off losses and higher power density

Noah, Mostafa; Kimura, Shota; Endo, Shun; Yamamoto, Masaaki; Imaoka, Jun; Umetani, Kazuhiro; Martínez, Wilmar

doi:10.1109/apec.2017.7930712

Cited by 28 publications

(12 citation statements)

References 10 publications

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“…Leakage inductance is playing an incredibly significant role in LLC resonant converters. For instance, many studies in the literature proposed topologies to utilize the transformer leakage inductance as a resonant inductance instead of using an external reactor coil in both single-phase [9]- [10] and three-phase topologies [11]- [15]. Therefore, in many designs, the external resonant inductance, which is a reactor coil, becomes no longer necessary to allow for a further miniaturization of LLC resonant converters.…”

Section: Introductionmentioning

confidence: 99%

Transformer with Adjustable Path-Core Type Inductance for Use in GaN-HEMT LLC Resonant Converter

Noah

Tsuruya³

et al. 2022

IEEJ Journal IA

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A novel magnetic structure for use in LLC resonant converters is proposed in this paper. It is known as a Path-core type Resonant Inductance Adjustable (PRIA) transformer, which is a type of transformer with adjustable resonant inductance. In the proposed transformer, the resonant inductance and magnetizing inductance can be designed separately; therefore, it becomes less challenging to realize the required resonant frequency. Moreover, the magnetizing inductance is not affected by any variation in the resonant inductance. The proposed PRIA transformer is found to improve the efficiency of the LLC converters. In this paper, the design of a resonant inductance of a PRIA transformer is presented. In addition, the application of PRIA transformers to a 1-MHz LLC resonant converter and 1 kW 1.4-MHz LLC resonant converter is presented.

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Section: Introductionmentioning

confidence: 99%

Transformer with Adjustable Path-Core Type Inductance for Use in GaN-HEMT LLC Resonant Converter

Noah

Tsuruya³

et al. 2022

IEEJ Journal IA

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“…In [12], the single-phase and three-phase topologies were compared. A 10 kVA 1 kHz three-phase MFT prototype was reported in [13], and a 2 kVA 100 kHz three-phase MFT was reported in [14]. A 5 MW three-phase converter was presented in [15] but using three single-phase MFTs.…”

Section: Introductionmentioning

confidence: 99%

Effective Permeability of Multi Air Gap Ferrite Core 3-Phase Medium Frequency Transformer in Isolated DC-DC Converters

et al. 2020

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The magnetizing inductance of the medium frequency transformer (MFT) impacts the performance of the isolated dc-dc power converters. The ferrite material is considered for high power transformers but it requires an assembly of type “I” cores resulting in a multi air gap structure of the magnetic core. The authors claim that the multiple air gaps are randomly distributed and that the average air gap length is unpredictable at the industrial design stage. As a consequence, the required effective magnetic permeability and the magnetizing inductance are difficult to achieve within reasonable error margins. This article presents the measurements of the equivalent B(H) and the equivalent magnetic permeability of two three-phase MFT prototypes. The measured equivalent B(H) is used in an FEM simulation and compared against a no load test of a 100 kW isolated dc-dc converter showing a good fit within a 10% error. Further analysis leads to the demonstration that the equivalent magnetic permeability and the average air gap length are nonlinear functions of the number of air gaps. The proposed exponential scaling function enables rapid estimation of the magnetizing inductance based on the ferrite material datasheet only.

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“…Thus, to improve the efficiency and power density of LLC converter, further efforts need to be spent on the design, optimisation and magnetic integration of the transformer. The integrated transformer has been invented [14–18], but a problem for three‐phase converters of this kind still exists, which is current unbalancing caused by different parameter tolerances for passive components. To handle the problem of parameter inequality, different topologies present the different control strategies.…”

Section: Introductionmentioning

confidence: 99%

Unbalanced current analysis of three‐phase AC–DC converter with power factor correction function based on integrated transformer

Xia

et al. 2020

IET power electron.

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A novel three-phase LLC resonant converter with integrated magnetics for lower turn-off losses and higher power density

Cited by 28 publications

References 10 publications

Transformer with Adjustable Path-Core Type Inductance for Use in GaN-HEMT LLC Resonant Converter

Transformer with Adjustable Path-Core Type Inductance for Use in GaN-HEMT LLC Resonant Converter

Effective Permeability of Multi Air Gap Ferrite Core 3-Phase Medium Frequency Transformer in Isolated DC-DC Converters

Unbalanced current analysis of three‐phase AC–DC converter with power factor correction function based on integrated transformer

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