Zero Voltage Switching Switched-Tank Modular Converter for Data Center Application

Wei, Mengxuan; Li, Yanchao; Ni, Ze; Liu, Chengkun; Cao, Dong

doi:10.1109/wipda46397.2019.8998894

Cited by 12 publications

(6 citation statements)

References 14 publications

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“…By combing a laddertype switched capacitor converter and switchedcapacitor-inductor cells, Uno's converter provides a high voltage gain. However, in all converters reported in the previous works [27][28][29][30][31], the inductor count also increases in proportion to the number of modules.…”

Section: Introductionmentioning

confidence: 93%

“…However, these introduced hybrid-type step-down converters [21][22][23][24][25] are not suitable for high step-down applications, because the voltage gain of these stepdown converters is small. Following these studies, Jian et al invented the switched-tank converter and its families [27][28][29][30]. In the switched tank converter, LC resonant tanks are used in the Dickson SC converter.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of a High Step-Down DC/DC Converter Topology with a Single Inductor

Eguchi¹,

Do²,

Shibata³

2021

IJIES

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This paper presents a novel high step-down dc/dc converter topology with a single inductor for 48V data center applications. Distinguished from conventional dc/dc converter topologies with a single inductor, the proposed converter topology is designed by series connecting a step-down cross-connected Fibonacci converter with a buck converter. By combination of these converter modules, the proposed converter topology offers a high voltage gain, viz. 1/48×, without cascade connection. Hence, high power efficiency is provided by the proposed single inductor topology. The characteristics of the proposed converter topology are investigated by theoretical analysis, computer simulations, and experiments. In the given theoretical analysis and the performed simulations, the proposed converter topology demonstrates higher power efficiency than the conventional converter topologies with a single inductor. Furthermore, the validity of the proposed topology is confirmed by the experiments.

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Section: Introductionmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Analysis of a High Step-Down DC/DC Converter Topology with a Single Inductor

Eguchi¹,

Do²,

Shibata³

2021

IJIES

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“…Popular applications of Class II MLCCs include filter capacitors in an AC-tied system, where the MLCCs are exposed to excitation with high amplitude but a relatively low-frequency [2], and energy transfer elements in a resonant switchedcapacitor converter (RSC) [3]. For high-compact RSC applications, which is the focus of this work, Class II MLCC can become the most primary energy transfer device over inductors in a series resonant tank operating at more than 100 kHz [3]- [5], as increasing the capacitance can eliminate physical inductors, resulting in a 'magnetic-free' design [5] [6]. In a typical cascaded RSC, c.f.…”

Section: Introductionmentioning

confidence: 99%

Loss Characterization and Modeling of Ferroelectric Class II Multi-Layer Ceramic Capacitors in Resonant Converters

Jiang¹

2022

Preprint

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<p>Class II multi-layer ceramic capacitors (MLCCs) employing ferroelectric materials have been widely utilized as the primary energy storage and transfer element in high-frequency resonant converters due to their ultra-high energy density. In these applications, MLCCs experience large-signal and high-frequency electrical excitations superimposed on biased voltages, burdening converters' efficiency due to their significant power loss. However, little has been published to reveal the large-signal loss characteristics of Class II MLCCs under such realistic operating conditions. This paper develops a novel characterization method to experimentally extract MLCC power loss using a resonant-Sawyer-Tower (Res-ST) circuit under large-signal and wide-frequency-range excitation with DC bias voltage. A general loss modeling approach based on Steinmetz’s Pre-electricized Graph (SPeG) is also proposed to accurately correlate the large excitation amplitude, wide-range frequency, and DC bias voltage. In this paper, the SpeG model first provides the material-specific volume loss density of four common dielectric materials and then can be easily extrapolated to evaluate the loss of the MLCCs with different rated voltage$\&$capacitance but employing the same dielectric material. In order to extend the material-specific SPeG model to device-level application, this paper also prepares an easy-to-follow tool, dielectric thickness observer (DTO), to estimate the dielectric microstructural geometry by tracking the $C$-$V$ characteristics provided in the product datasheet. The combination of the proposed loss characterization method, SPeG model, and DTO can be used as a very convenient and accurate tool to estimate the power loss of MLCCs in different applications, in particular high-frequency resonant tanks. This article is accompanied by SEM images and MATLAB code demonstrating the effectiveness of the proposed DTO.</p>

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“…2. Topologies using inductive-based approach can be adopted in step-up or step-down applications [8]- [11], however, their limited duty cycle prevents them from achieving high conversion ratio, which also causes high voltage and current stress over components employed. In order to overcome these drawbacks, and matrix transformer structures [17]- [28] and interleaved structures [30]- [31] have been proposed.…”

Section: Introductionmentioning

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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Zero Voltage Switching Switched-Tank Modular Converter for Data Center Application

Cited by 12 publications

References 14 publications

Analysis of a High Step-Down DC/DC Converter Topology with a Single Inductor

Analysis of a High Step-Down DC/DC Converter Topology with a Single Inductor

Loss Characterization and Modeling of Ferroelectric Class II Multi-Layer Ceramic Capacitors in Resonant Converters

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

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