A Family of DC Transformer (DCX) Topologies Based on New ZVZCS Cells With DC Resonant Capacitance

Qin, Wei; Wu, Xinke; Zhang, Junming

doi:10.1109/tpel.2016.2572146

Cited by 36 publications

(11 citation statements)

References 28 publications

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“…Here, RSp_HBCLLC is the ESR of each primary-side transformer winding of the conventional converter. In comparison, the primary-side total copper loss of the proposed converter is represented in (71) in reference to (24) and (25).…”

Section: Transformer and Inductor Copper Lossmentioning

confidence: 99%

Analysis and Comparison of Series Resonant Converter With Embedded Filters for High Power Density DCX of Solid-State Transformer

et al. 2022

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A series resonant converter (SRC) operating as a DC transformer (DCX) is a candidate for the isolated bidirectional DC/DC converters of solid-state transformers (SSTs). However, the input/output current ripple of the SRC is relatively high, which requires bulky parallel capacitors and low-pass filters such as C/LC filters. These additional components reduce the power density. In addition, to operate an SRC as a DCX, a small resonant inductance is desired to reduce the voltage gain variation and achieve a faster transient response. To resolve these problems, a SRC with embedded filters is studied. Adding a clamping capacitor between split transformers not only significantly reduces current ripples and the harmonic components of the input/output currents but also connects resonant inductors in parallel to reduce the equivalent resonant inductance. In addition, dividing the resonant current into two split windings reduces the RMS current of the transformer. This paper presents a detailed analysis, a design methodology, and a comprehensive comparison with the conventional half-bridge CLLC converter with C/LC filters. 1-kW prototypes with a 600-V input voltage and 200-V output voltage demonstrate the superiority of the proposed converter; the second harmonic of the output current was significantly suppressed by 19.3 dB compared with that of the conventional converter with the same power density. The loss breakdown showed the proposed converter mitigated copper loss by 9.47% and eliminated the losses of the filter and DC-link capacitors. The prototype of the proposed converter had the highest efficiency of 95.4% at full-load among prototypes.

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Section: Transformer and Inductor Copper Lossmentioning

confidence: 99%

Analysis and Comparison of Series Resonant Converter With Embedded Filters for High Power Density DCX of Solid-State Transformer

et al. 2022

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“…Some resonant cell can also be added in converters to realize soft switching. Paper [36] proposed an input current fed (ICF) cell and an output current sink (OCS) cell, as shown in Fig.8. With these two cells, ZVS on and quasi ZCS off for switch are both achieved, which can be extended to push-pull, full bridge, half bridge, and other dual end topologies.…”

Section: B Non-resonant Convertersmentioning

confidence: 99%

A Review of High Frequency Power Converters and Related Technologies

Wang

Lucía

Zhang

et al. 2020

IEEE Open J. Ind. Electron. Soc.

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Development of power electronic converters tend to achieve high efficiency and at the same time high power density in many industrial applications. In recent years, with emerging third-generation semiconductor materials i.e. Silicon Carbide (SiC) and Gallium Nitride (GaN), the switching frequency of several MHz has become a widely studied frequency band, therefore traditional technology can no longer meet the demand, and many new challenges appear. This paper presents a comprehensive review of high frequency (HF) converters, the essential challenges are analyzed such as topology selection, soft-switching technologies, resonant gate drivers, magnetic components design and optimization. INDEX TERMS High frequency, converter, soft-switching resonant gate driver, magnetic components.

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“…Although the isolated DC–DC converters are widely employed in industry and research, too many components are used in the topologies, which result in low‐power density. Moreover, the transformer may harm conversion efficiency as well [20–23]. To overcome these drawbacks, a Ni‐DCX working at the fixed‐gain point is proposed.…”

Section: Operation Principle Of the Non‐isolated DCXmentioning

confidence: 99%

Dual‐output AC–DC converter with three‐port bridgeless PFC and non‐isolated DCX

Jia

et al. 2020

IET power electron.

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A Family of DC Transformer (DCX) Topologies Based on New ZVZCS Cells With DC Resonant Capacitance

Cited by 36 publications

References 28 publications

Analysis and Comparison of Series Resonant Converter With Embedded Filters for High Power Density DCX of Solid-State Transformer

Analysis and Comparison of Series Resonant Converter With Embedded Filters for High Power Density DCX of Solid-State Transformer

A Review of High Frequency Power Converters and Related Technologies

Dual‐output AC–DC converter with three‐port bridgeless PFC and non‐isolated DCX

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