Two-phase interleaved LLC resonant converter with phase shedding control

Kim, Myungbok

doi:10.1109/ipec.2010.5543130

Cited by 10 publications

(2 citation statements)

References 4 publications

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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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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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“…As part of efforts to improve power supply efficiency under light load conditions, methods such as controlling the number of power supply modules or using the phase shedding technology of a DC-DC converter have been considered [5] [6]. These techniques aim at changing the maximum efficiency load point by adjusting power supply module configurations.…”

Section: Introductionmentioning

confidence: 99%

Adaptive Power Efficiency Control by Computer Power Consumption Prediction Using Performance Counters

Kawaguchi

Yachi

2016

IEEE Trans. on Ind. Applicat.

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As the number of data centers has grown in pace with the burgeoning expansion in information technology (IT), reducing data center power consumption has become an important social challenge. Since IT equipment is a primary contributor to data center power consumption, it is also an area where power conservation efforts are indispensable. Nevertheless, while the efficiency of the power supply modules integrated into computers has recently seen significant improvements, their overall efficiency depends primarily on load rates. This is especially true under low power load conditions, where efficiency is known to decrease drastically. Recently, power-saving techniques that work by controlling the power module configuration under low power load conditions have been considered, and, using such techniques, it is expected that further efficiency improvements can be achieved by interlocking the computer load status with the power supply configuration control in real time. In this study, the performance counters built into computer processors are used to predict power load variations and an equation that facilitates prediction of server power consumption levels is defined. In a server application experiment utilizing prototype computer hardware and multiple regression analysis, we confirmed that the power prediction equation could precisely predict computer power requirements and achieve adaptive efficiency control. In order to further validate the efficiency control effect, a circuit simulation was conducted. The simulation results showed that a power loss reduction of up to 28.3% could be achieved using the model equations to control power supply module efficiency.

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An interleaving and load sharing method for multiphase LLC converters

Qiu

Liu

et al. 2013

2013 Twenty-Eighth Annual IEEE Applied Power Electronics Conference and Exposition (APEC)

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Two-phase interleaved LLC resonant converter with phase shedding control

Cited by 10 publications

References 4 publications

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

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

Adaptive Power Efficiency Control by Computer Power Consumption Prediction Using Performance Counters

An interleaving and load sharing method for multiphase LLC converters

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