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Advanced in Resonant Converter and Dual Active Bridge Converter

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A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "F: Electrical Engineering".

Deadline for manuscript submissions: closed (9 October 2019) | Viewed by 33495

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Prof. Dr. Rae-Young Kim

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Guest Editor

Department of Electrical and Biomedical Engineering, Hanyang University, Seoul, Republic of Korea
Interests: modeling and control of power converter systems; soft switching techniques; energy management systems in smart grid applications; power converter systems for renewable energies; motor drive systems

Special Issue Information

Dear colleagues,

With the recent appearance of wide band gap (WBG) devices, ultrafast switching for a high power density of the power converter is possible. These advancements in semiconductor devices are driving enhanced technologies and approaches for resonant converters and dual active bridge converters to provide more high efficiency and high density.

In areas such as wireless power transfer, power supply, and/or solid state transformer, in particular, where spatial separation or electrical isolation must be implemented simultaneously, these improvements are critical to improving system performance.

This Special Issue will cover this promising and dynamic field of research and development. Innovative papers on advanced topology, simulation, modeling, and control enhancement of a load resonant converter or dual active bridge (DAB) Converter are welcome in this special area. Topics of interest for publication include, but are not limited to:

Novel power electronic topologies;
Modeling, analysis, and design of converter and/or control;
SiC/GaN-based high frequency operation;
Resonant network or transformer design, tuning, and optimization;
High efficiency design and control;
Applied technololgy to wireless power transfer (WPT) systems or DC–DC conversion with electrical isolation.

Prof. Dr. Rae-Young Kim
Guest Editor

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Keywords

resonant converter
dual active converter
wide band gap device
high switching frequency
soft switching technique
wireless power transfer
high efficiency converter

Published Papers (7 papers)

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Research

14 pages, 5370 KiB

Open AccessArticle

High-Efficiency Bidirectional LLC Resonant Converter with Primary Auxiliary Windings

by Eun-Soo Kim and Jae-Sung Oh

Energies 2019, 12(24), 4692; https://doi.org/10.3390/en12244692 - 10 Dec 2019

Cited by 6 | Viewed by 8348

Abstract

In this paper, high-efficiency bidirectional LLC resonant converters with primary auxiliary windings in transformers of resonant circuits are proposed. Even though resonant capacitors are used on the primary and secondary sides, the proposed converter can operate, regardless of the direction of the power flow, with the high gain characteristics of the LLC resonant converter without the mutual coupling of resonant capacitors. The operation principles and gain characteristics of the proposed bidirectional DC–DC converters are described in detail. A 3.3 kW prototyped bidirectional LLC resonant converter for interfacing 750 V_DC buses was built and tested to verify the effectiveness and applicability of this proposed converter. Full article

(This article belongs to the Special Issue Advanced in Resonant Converter and Dual Active Bridge Converter)

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17 pages, 4918 KiB

Open AccessArticle

Voltage Balance Switching Scheme for Series-Connected SiC MOSFET LLC Resonant Converter

by Hwa-Rang Cha and Rae-Young Kim

Energies 2019, 12(20), 4003; https://doi.org/10.3390/en12204003 - 21 Oct 2019

Cited by 3 | Viewed by 3797

Abstract

To achieve high efficiency and power density, silicon carbide (SiC)-based Inductor-Inductor-Capacitor (LLC) resonant converters are applied to the DC/DC converter stage of a solid-state transformer (SST). However, because the input voltage of an SST is higher than the rated voltage of a commercial SiC device, it is essential to connect SiC devices in series. This structure is advantageous in terms of voltage rating, but a parasitic capacitance tolerance between series-connected SiC devices causes voltage imbalance. Such imbalance greatly reduces system stability as it causes overvoltage breakdown of SiC device. Therefore, this paper proposes a switching scheme to solve the voltage imbalance between SiC metal-oxide-semiconductor field-effect transistors (MOSFETs). The proposed scheme sequentially turns off series-connected SiC MOSFETs to compensate for the turn-off delays caused by parasitic capacitor tolerances. In addition, dead-time selection methods to achieve voltage balance and zero voltage switching simultaneously are provided in detail. To verify the effectiveness of the proposed scheme, experiments were conducted on a 2 kW series-connected SiC MOSFET LLC resonant converter prototype. Full article

(This article belongs to the Special Issue Advanced in Resonant Converter and Dual Active Bridge Converter)

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19 pages, 6572 KiB

Open AccessArticle

Modeling and Control of Double-Sided LCC Compensation Topology with Semi-Bridgeless Active Rectifier for Inductive Power Transfer System

by Hwa-Rang Cha, Rae-Young Kim, Kyung-Ho Park and Yeong-Jun Choi

Energies 2019, 12(20), 3921; https://doi.org/10.3390/en12203921 - 16 Oct 2019

Cited by 4 | Viewed by 3245

Abstract

This paper proposes the modeling and design of a controller for an inductive power transfer (IPT) system with a semi-bridgeless active rectifier (S-BAR). This system consists of a double-sided Inductor-Capacitor-Capacitor (LCC) compensation network and an S-BAR, and maintains a constant output voltage under load variation through the operation of the rectifier switches. Accurate modeling is essential to design a controller with good performance. However, most of the researches on S-BAR have focused on the control scheme for the rectifier switches and steady-state analysis. Therefore, modeling based on the extended describing function is proposed for an accurate dynamic analysis of an IPT system with an S-BAR. Detailed mathematical analyses of the large-signal model, steady-state operating solution, and small-signal model are provided. Nonlinear large-signal equivalent circuit and linearized small-signal equivalent circuit are presented for intuitive understanding. In addition, worst case condition is selected under various load conditions and a controller design process is provided. To demonstrate the effectiveness of the proposed modeling, experimental results using a 100 W prototype are presented. Full article

(This article belongs to the Special Issue Advanced in Resonant Converter and Dual Active Bridge Converter)

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13 pages, 6779 KiB

Open AccessArticle

Analysis and Design of High-Efficiency Bidirectional GaN-Based CLLC Resonant Converter

by Yuanjun Liu, Guiping Du, Xueyi Wang and Yanxiong Lei

Energies 2019, 12(20), 3859; https://doi.org/10.3390/en12203859 - 12 Oct 2019

Cited by 16 | Viewed by 4140

Abstract

A bidirectional CLLC resonant converter (CLLC-BRC) based on GaN transistors is analyzed and designed in this paper. Similar resonant topologies are listed and commented on, with the CLLC topology showing competitiveness in bidirectional energy transmission. The analysis of the aforementioned converter has been provided, including the reveal of resonant frequencies of the CLLC topology and an improved zero-voltage switching (ZVS) condition with operation principles of the reverse mode and relevant parasitic parameters taken into account. The design methodology of the aforementioned converter based on pulse frequency modulation (PFM) is further discussed in detail. A prototype with a rated power of 400 W and a maximal operating frequency that is larger than 0.5 MHz was built to verify the proposed design methodology. The highest conversion efficiency of the prototype was 97.02% in the forward mode, and it was 95.96% in the reverse mode. Full article

(This article belongs to the Special Issue Advanced in Resonant Converter and Dual Active Bridge Converter)

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15 pages, 7012 KiB

Open AccessFeature PaperArticle

Modeling and Stability Analysis of Model Predictive Control Dual Active Bridge Converter

by Guoqing Gao, Wanjun Lei, Yao Cui, Kai Li, Ling Shi and Shiyuan Yin

Energies 2019, 12(16), 3103; https://doi.org/10.3390/en12163103 - 13 Aug 2019

Viewed by 3699

Abstract

Digital control has been widely used in dual active bridge (DAB) converters, which are pivotal parts of electric vehicles and distributed generation systems. However, the time delays introduced by the digital control could affect the performance or even lead to the instability of the digitally controlled DAB converter. In order to reduce the effect of time delay on the dynamics and stability of the system, the model predictive control (MPC) of the DAB converter is proposed based on the discrete-time iteration in this paper to compensate for the digital control delay. According to the obtained discrete-time model, the instability mechanism of the MPC DAB converters with different parameters is revealed. The simulation and theoretical analysis indicate that this method could reduce the influence of the digital control delay and increase the stable range of the system compared with the conventional control strategy. The proposed method is also revealed to have a strong compatibility and portability. In addition, the accurately predicted stability boundaries can be applied to the practical parameter design and guarantee the stable operation of the system. The experimental results are consistent with the theoretical analysis and verify the proposed method. Full article

(This article belongs to the Special Issue Advanced in Resonant Converter and Dual Active Bridge Converter)

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24 pages, 9061 KiB

Open AccessFeature PaperArticle

A Si-FET-Based High Switching Frequency Three-Level LLC Resonant Converter

by Jung-Woo Yang and Sang-Kyoo Han

Energies 2019, 12(16), 3082; https://doi.org/10.3390/en12163082 - 09 Aug 2019

Cited by 2 | Viewed by 3517

Abstract

This paper highlights the proposed silicon field-effect transistor (Si-FET)-based high switching frequency three-level (TL) LLC resonant converter. It provides a detailed operational analysis of the converter; the multilevel (ML) organization of cells; voltage-balancing principles; current-balancing principles; loss comparison between Si-FETs and gallium-nitride (GaN)-FETs; and an optimal design consideration based on loss analysis. This analysis reveals that the switching losses of all power switches can be considerably reduced as the voltage across each switch can be set to half of the input voltage without an additional circuit or control strategy. Moreover, the current of each resonant inductor is automatically balanced by a proposed integrated magnetic (IM)-coupled inductor. Therefore, the operating frequency can be easily increased to near 1 MHz without applying high-performance switches. In addition, the resonant tanks of the converter can be a group of cells for multilevel operation, which indicates that the voltage across each switch is further reduced as more cells are added. Based on the results of the analysis, an optimal design consideration according to the resonant tank and switching frequency is discussed. The proposed converter was validated via a prototype converter with an input of 390 V, an output of 19.5 V/18 A, and a frequency of 1 MHz. Full article

(This article belongs to the Special Issue Advanced in Resonant Converter and Dual Active Bridge Converter)

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24 pages, 2479 KiB

Open AccessFeature PaperArticle

Modeling and Optimization of Dual Active Bridge DC-DC Converter with Dead-Time Effect under Triple-Phase-Shift Control

by Chaochao Song, Alian Chen, Yiwei Pan, Chunshui Du and Chenghui Zhang

Energies 2019, 12(6), 973; https://doi.org/10.3390/en12060973 - 13 Mar 2019

Cited by 11 | Viewed by 5045

Abstract

Dead-time effect has become an apparent issue in high-switching-frequency high-power dual active bridge (DAB) DC-DC converter. This paper gives a detailed analysis of phase-shift errors effect caused by dead time, including output voltage offset, soft-switching failure, optimal scheme failure, etc. Phase-shift errors effect will invalidate traditional analyses of optimal control and mislead the design of DAB converter. To overcome these drawbacks, various operating modes and an accurate transmission power model incorporating dead time under triple-phase-shift (TPS) control are developed. On this basis, an optimal TPS incorporating dead time (TPSiDT) scheme is further proposed to minimize the current stress, while guaranteeing soft-switching operation by using Lagrange multiplier method (LMM) and Genetic Algorithm (GA). The novel transmission power model can provide accurate power flow computation to avoid phase-shift errors. Therefore, in practical applications, the minimum current stress and soft-switching operation can be guaranteed, and the efficiency of DAB converter can be improved. Finally, the experimental results verify the feasibility of the proposed TPSiDT scheme. Full article

(This article belongs to the Special Issue Advanced in Resonant Converter and Dual Active Bridge Converter)

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