Interleaved LLC series converter with output voltage doubler

Lin, Bor‐Ren; Yang, Wen-Ren; Chen, Jyun-Ji; Huang, Chien-Lan; Yu, Ming-Hung

doi:10.1109/ipec.2010.5543842

Cited by 16 publications

(4 citation statements)

References 13 publications

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“…Matrix transformers with different connection methods can disperse the stress of power components, improve heat dissipation problems, and increase the power level. When working with two transformers, there are four types of different connections that can improve different problems, such as series-series, series-parallel, parallel-parallel, and parallel-series connections [13][14][15][16]. Where [13] and [14] use two transformers to improve the power level, [15] uses a series-series connection to reduce the voltage stress of the transformers and ensure the currents are balanced on the primary side.…”

Section: Introductionmentioning

confidence: 99%

“…When working with two transformers, there are four types of different connections that can improve different problems, such as series-series, series-parallel, parallel-parallel, and parallel-series connections [13][14][15][16]. Where [13] and [14] use two transformers to improve the power level, [15] uses a series-series connection to reduce the voltage stress of the transformers and ensure the currents are balanced on the primary side. The authors of [16] use a series-parallel connection to reduce the turns of the primary windings and current stress on the secondary windings.…”

Section: Introductionmentioning

confidence: 99%

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Analysis and Design of Three-Phase LLC Resonant Converter with Matrix Transformers

et al. 2022

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This study presents the topology of a three-phase LLC resonant converter with matrix transformers. The three-phase LLC resonant converter has the advantages of conventional LLC resonant converters, including zero-voltage switching at the primary side, zero-current switching at the secondary side, high-frequency feasibility, and high efficiency. Moreover, it has additional advantages that differ from conventional LLC, including low output capacitor current ripple, natural current sharing in three resonant currents, and a high power level. As a result of the above mentioned characteristics, LLC topology has been used in many electric vehicle charging systems, server power systems, and other high-power applications. However, as the power level becomes higher and higher, the input voltage is usually too high to reduce conduction loss, and the output current also increases. This situation makes transformer design more difficult. The increasing current means more core and copper loss, and the heat dissipation of the transformer becomes more difficult. Matrix transformer technology can improve this problem directly and simply. By utilizing matrix transformers, which are primary series connected and secondary parallel connected, the primary voltage stress and secondary current stress of the transformers can be reduced, and the output current can be distributed. The analysis of the proposed converter in this study includes a circuit operation introduction, a time-domain analysis, calculation of the transfer ratio curve in the frequency domain, and a loss analysis. The theoretical analysis and performance of the proposed converter are verified. A three-phase LLC resonant converter with matrix transformers prototype is built with a high input voltage of 800-VDC and high output current of 200-A. The output voltage is 100-VDC. The waveform and efficiency data will be shown in the experimental results.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Analysis and Design of Three-Phase LLC Resonant Converter with Matrix Transformers

et al. 2022

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“…Due to high efficiency, high power density and simple structure, etc., the LLC resonant converter is widely applied in electric vehicles, high-power microwave systems, aerospace power supplies, communication power supplies, Micro-Grid and UPS equipment [1][2][3][4][5][6][7][8][9][10][11][12]. To further improve the performance of the LLC resonant converter in high current applications, an interleaving technique is proposed [13][14][15][16], which has the advantages of lower conduction loss, smaller current ripple and phase shedding capability. Interleaved LLC converters are operating at the same switching frequency for ripple cancelation.…”

Section: Introductionmentioning

confidence: 99%

Zero-Vector-Injection Based Current Sharing Control of Interleaved Full-Bridge LLC Resonant Converters

Luo

et al. 2020

Energies

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Interleaved LLC resonant converters are widely used in various fields. However, interleaved LLC converters under Pulse Frequency Modulation (PFM) will lose the regulation of individual phases, causing a load sharing problem. Existing load sharing solutions have limitations; for example, phase shedding and current sharing cannot be realized at the same time. This paper proposed a novel current sharing method for interleaved full-bridge LLC resonant converters. Based on Zero-Vector-Injection, the voltage applied to the resonant tank is controlled to compensate for the difference in gain caused by component tolerance. The modulation strategy is proposed to maintain soft switching after Zero-Vector-Injection, and the phase shedding technique is also used to improve the efficiency at a light load. The detailed theoretical analysis and implementation method are proposed and validated using simulations. Experiments are also carried out to verify the feasibility of the proposed strategy based on a 2-phase 1.8 kW prototype.

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“…For middle level power applications, among various DC-DC converters developed so far, LLC resonant converters, has the advantages as the simplicity of circuit configurations and the acquisition of big voltage gains in narrow frequency interval when compared to the serial/parallel resonant converters. Due to the limitations of high current effects, output regulation and power density of traditional resonant converters, novel topologies and switching modes for the design of LLC resonant converters have been proposed in the literature [6][7][8][9]. The most challenging part of thin power card design with high power density is the transformer design.…”

Section: Introductionmentioning

confidence: 99%

Design and optimization of a power supply unit for low profile LCD/LED TVs

Vural

Demirel²,

Erkmen³

2017

Int. J. Optim. Control, Theor. Appl. (IJOCTA)

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The ongoing demand for smaller and lighter power supplies is driving the motivation to increase power density while maintaining a robust design compatible with international harmonic standards. Transformer design is a major challenge for low profile and high power density TV power cards. In addition to these, for electromagnetic interference standard and for providing efficient thermal management for heat emission, it is required to minimize EMI noise. In this study, by taking these stated criteria into consideration, a TV power card has been designed, which has 220W output power and can be used in low profile televisions. Proposed power card will meet desired critical parameters such as surface area and output power of the referenced card which has 13.5mm height, the heat, and power consumption at standby mode. Moreover, it is designed with 10mm height limit without any engraving on PCB in a way that it will meet International Electrotechnical Commission (IEC) current harmonic standard to which TVs are subjected. Experimental results demonstrate that the proposed power supply with 10mm height has 34% higher power density with respect to its counterpart having 13.5 mm height.

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Interleaved LLC series converter with output voltage doubler

Cited by 16 publications

References 13 publications

Analysis and Design of Three-Phase LLC Resonant Converter with Matrix Transformers

Analysis and Design of Three-Phase LLC Resonant Converter with Matrix Transformers

Zero-Vector-Injection Based Current Sharing Control of Interleaved Full-Bridge LLC Resonant Converters

Design and optimization of a power supply unit for low profile LCD/LED TVs

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