The Cascaded Resonant Converter: A Hybrid Switched-Capacitor Topology With High Power Density and Efficiency

Ye, Zichao; Lei, Yutian; Pilawa-Podgurski, Robert C. N.

doi:10.1109/tpel.2019.2947218

Cited by 111 publications

(83 citation statements)

References 38 publications

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“…With these decoupling capacitors included, the converter actually requires more capacitors than predicted in (2). These decoupling capacitors can be eliminated by operating two two-phase doublers in parallel, but in an interleaved manner ( [7] gives an example of such a control scheme as used in the cascaded resonant converter). Another method to get rid of the decoupling capacitors is adding more operating phases to the converter, during which certain capacitors are disconnected from the circuit.…”

Section: B Multi-phase Sc Convertersmentioning

confidence: 99%

Multi-Resonant Switched-Capacitor Converter: Achieving High Conversion Ratio With Reduced Component Number

Abramson

et al. 2022

IEEE Open J. Power Electron.

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This article presents a family of resonant switchedcapacitor (SC) converters with multiple operating phases, herein named "Multi-Resonant SC Converter". These converters can be synthesized from the basic two-phase SC topologies, such as the Doubler and the Series-Parallel, and are capable of achieving the same conversion ratio with fewer capacitors and switches. The augmenting inductor can resonantly charge/discharge all flying capacitors at different resonances, thereby facilitating softcharging and soft-switching operation. Based upon this concept, an 8-to-1 Multi-Resonant-Doubler (MRD) converter and a 6to-1 Cascaded Series-Parallel (CaSP) converter are proposed and analyzed. Both theoretical analysis and experimental results from a practical implementation are provided to demonstrate the benefits of the multi-resonant approach. The designed hardware prototype is configurable and can achieve one of the best overall in-class performances for the intermediate bus conversion in data centers. At 48-to-6 V conversion, the prototype achieves 98.6% peak efficiency (98.0% including gate drive loss) and 1675 W/in 3 power density. At 48-to-8 V conversion, the prototype achieves 99.0% peak efficiency (98.5% including gate drive loss) and 2230 W/in 3 power density.

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Section: B Multi-phase Sc Convertersmentioning

confidence: 99%

Multi-Resonant Switched-Capacitor Converter: Achieving High Conversion Ratio With Reduced Component Number

Abramson

et al. 2022

IEEE Open J. Power Electron.

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“…With the significant reduction in the footprint of power converters realized based on Gallium Nitride (GaN) semiconductor devices, topologies that require a larger number of semiconductor devices such as switched-capacitor and multilevel converters have become attractive [52,53,54,55,56,57,58,59,60]. Due to low switching energy of GaN devices, much higher switching frequencies, compared to Si devices, can be achieved without prohibitive switching power losses.…”

Section: Literature Review Pertinent To Thesis Objectivesmentioning

confidence: 99%

An Isolated Soft-Switched DC-DC Converter For Interconnection Of Medium- And Low-Voltage DC Grids

Saeedifard¹

2021

Preprint

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As the electric power grid increasingly hosts energy storage devices, renewable energy resources, plug-in hybrid and electric vehicles, and data centers, it is expected to benefit in the future from a multi-layer DC structure meshed within its legacy AC architecture. As such a multi-layer grid structure evolves, interconnection of DC grids with different voltage levels will become necessary. For such interconnections and for power-flow control, efficient isolated DC-DC converters are a key enabling technology. This thesis thus presents the results of an in-depth investigation into the operation, modulation, control, and performance assessment of a particular DC-DC converter configuration. The proposed DC-DC converter, which is based upon a hybrid combination of the conventional dual-active-bridge topology and the modular multi-level converter (MMC) configuration, is a potential candidate topology for interconnection of medium- and low-voltage DC grids. The thesis first introduces the circuit topology and presents the basics of operation and governing steady-state equations for the converter. Then, based on the developed mathematical model, it identifies a suitable modulation strategy for the converter bridges and submodules, as well as strategies for the regulation of the MMC submodule capacitor voltages and soft switching of the constituent semiconductor devices. The proposed converter topology offers significant benefits including galvanic isolation, utilization of the transformer’s leakage inductance, soft switching for high-frequency operation, and bidirectional power flow capability. The validity of the mathematical model, effectiveness of the proposed modulation and control strategies, and the realization of soft switching are verified through off-line simulation of a detailed circuit model as well as experiments conducted on a 1-kW experimental setup.

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“…Recently, topologies using switched-capacitors (SC) are also gaining attention due to the higher power density of capacitors in comparison to inductors, at the same time that they are easier to manufacture [6].…”

Section: Introductionmentioning

confidence: 99%

Analysis and Design of an Interleaved Switched-Capacitor Multilevel ANPC Converter

Bach¹,

Castiblanco²,

Rech³

2021

Proceedings of the 13th Seminar on Power Electronics and Control (SEPOC 2021)

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This paper presents an interleaved switchedcapacitor multilevel ANPC converter (SCANPC) for high power density applications. To demonstrate the feasibility of the idea, the analysis and design of the converter are made initially for one cell and after for the two cells interleaved configuration. In addition, it is used a power loss estimation methodology for the Gallium Nitride switches. Simulations and power loss estimations are shown for a 4kW power prototype.

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The Cascaded Resonant Converter: A Hybrid Switched-Capacitor Topology With High Power Density and Efficiency

Cited by 111 publications

References 38 publications

Multi-Resonant Switched-Capacitor Converter: Achieving High Conversion Ratio With Reduced Component Number

Multi-Resonant Switched-Capacitor Converter: Achieving High Conversion Ratio With Reduced Component Number

An Isolated Soft-Switched DC-DC Converter For Interconnection Of Medium- And Low-Voltage DC Grids

Analysis and Design of an Interleaved Switched-Capacitor Multilevel ANPC Converter

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