A Wide Input Range Isolated Stacked Resonant Switched-Capacitor dc-dc Converter for High Conversion Ratios

Li, Yongjun; Li, Gu; Hariya, Akinori; Ishizuka, Yoichi; Rivas-Davila, Juan; Sanders, S.R.

doi:10.1109/compel.2018.8459936

Cited by 16 publications

(8 citation statements)

References 16 publications

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“…As a result, these structures allow for very large ripple, with [7] demonstrating flying capacitors being exercised over almost their entire dielectric range. In addition, the dielectric barrier of resonant tanks may find a two-fold use in capacitively isolated designs [41], [42]. Regulation may often be achieved using phase shiftedoperation while preserving ZVS over a known operating range [41], or by modulating the converters output impedance using DOTM [40].…”

Section: Contemporary Dickson Convertersmentioning

confidence: 99%

“…In addition, the dielectric barrier of resonant tanks may find a two-fold use in capacitively isolated designs [41], [42]. Regulation may often be achieved using phase shiftedoperation while preserving ZVS over a known operating range [41], or by modulating the converters output impedance using DOTM [40]. Another example is Google's "switched-tank" converter (STC) [43], depicted in Fig.…”

Section: Contemporary Dickson Convertersmentioning

confidence: 99%

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Large Signal Analysis on Variations of the Hybridized Dickson Switched-Capacitor Converter

Ellis

Amirtharajah

2022

IEEE Trans. Power Electron.

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Dickson-type DC-DC converters have gained renewed interest in recent years due to their best-in-class volt-amp switch utilization. In addition, "hybrid" switched-capacitor (HSC) structures increase passive component utilization while avoiding the slow-switching limit (SSL), and yet, most HSC work to date has done little to assess large signal voltage ripple behavior and subsequent passive utilization limits. This work contributes a comprehensive review of contemporary Dickson-type HSC converters before introducing eight fundamental reduced HSC Dickson structures, including three that are proposed here. Analysis allowing characterization of large signal operating points, capacitor sizing regimes, switching schemes, and maximum allowable power throughput is introduced. The analysis for "splitphase" switching is also presented in detail, without making small ripple approximations. Furthermore, an expression for large ripple flying capacitor energy density utilization is derived, assisting with optimal topology selection and revealing that splitphase operation may be preferable for conversion ratios greater than 6:1. All analysis is verified in simulation, with an additional discrete hardware prototype further validating a complex case of resonant split-phase timing. The analytical results of seventeen distinct Dickson variations are recorded, assisting with topology selection and design.

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Section: Contemporary Dickson Convertersmentioning

confidence: 99%

Section: Contemporary Dickson Convertersmentioning

confidence: 99%

Large Signal Analysis on Variations of the Hybridized Dickson Switched-Capacitor Converter

Ellis

Amirtharajah

2022

IEEE Trans. Power Electron.

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“…High power density can be challenging to achieve with conventional isolated converters that typically employ large and heavy transformers to achieve galvanic isolation. Thus, with the continual demand for smaller and lighter power electronics, hybrid-SC solutions that introduce a dielectric barrier between input and output have gained attention as possible cost-effective isolation alternatives to purely magnetic-based approaches [10]- [12].…”

Section: Introductionmentioning

confidence: 99%

“…It maintains favorable features, such as: complete soft-charging with two-phase operation and a 50% duty cycle; the lack of a bypass capacitor column requirement; and load-independent switch stress. Additionally, in contrast [12]. Since the right-side inductor is tied to a static DC bias, full mutual coupling between both inductors is required in order to drive the low-side full-bridge.…”

Section: Introductionmentioning

confidence: 99%

A Capacitively-Isolated Dual Extended LC-tank Hybrid Switched-Capacitor Converter

Jackson

Ellis

Pilawa-Podgurski

2022

2022 IEEE Applied Power Electronics Conference and Exposition (APEC)

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This work introduces a resonant Dickson-type converter topology whose flying capacitors provide dielectric isolation between input and output terminals. For even conversion ratios, it achieves complete soft-charging of all of its flying capacitors with a convenient 50% duty cycle. Additionally, switch count is reduced relative to prior work and no distributed bypass capacitor column is required. Moreover, this topology actively drives both of its inductors without the requirement for mutual coupling between magnetic elements. A discrete 4:1 hardware prototype designed for 48 V up to rectified US mains applications is demonstrated and achieves a high power density of 2,010 W/in 3 with a 140 V input voltage and 941 kHz switching frequency.

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“…Switched‐capacitor (SC) converters are another group of DC‐DC converters that are widely used and highly interest researchers in numerous applications because of their effectiveness and capabilities . So far, many kinds of SC converters have been introduced and investigated for various applications .…”

Section: Introductionmentioning

confidence: 99%

A Zeta‐based switched‐capacitor DC‐DC converter topology

Vosoughi

Abbasi

et al. 2019

Circuit Theory & Apps

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Summary This article proposes a new Zeta‐based switched‐capacitor (SC) dc‐dc converter, which has many advantages such as increased voltage gain, decreased duty‐cycle, lower voltage stress on components such as its capacitors and input switch, and increased output power over traditional dc‐dc converter structures. In traditional converters such as Zeta converter, there is only one coupling capacitor, which works as a medium for transferring the power between input and the output. However, in the proposed Zeta‐based converter, there are multiple coupling capacitors, which are used based on dc‐dc SC converter principles. By using these switched coupling capacitors, the mentioned advantages are obtained for the proposed structure, which in turn make this converter more applicable for industrial applications. The analysis has been validated by comprehensive and precise comparisons and experimental results.

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A Wide Input Range Isolated Stacked Resonant Switched-Capacitor dc-dc Converter for High Conversion Ratios

Cited by 16 publications

References 16 publications

Large Signal Analysis on Variations of the Hybridized Dickson Switched-Capacitor Converter

Large Signal Analysis on Variations of the Hybridized Dickson Switched-Capacitor Converter

A Capacitively-Isolated Dual Extended LC-tank Hybrid Switched-Capacitor Converter

A Zeta‐based switched‐capacitor DC‐DC converter topology

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