Resonant and multi-mode operation of flying capacitor multi-level DC-DC converters

Kesarwani, Kapil; Stauth, Jason T.

doi:10.1109/compel.2015.7236511

Cited by 71 publications

(26 citation statements)

References 12 publications

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“…These converter types are addressed in more detail in Section III-A. In addition to the previously mentioned multilevel structures, multilevel dc-dc converters with a diode clamp and flying capacitors can be classified under the single dc input source group and their principles are detailed in the literature [66], [67]. b) Cascaded (multiple dc source): To increase the output voltage level of PV or FC modules, such sources can be connected in series to increase their string voltage.…”

Section: E Multistage/-levelmentioning

confidence: 99%

“…Single system-on-chip (SOC) solutions are quite useful for boosting low battery voltages such as 1.2 V alkaline or NiMH to microprocessor voltage levels (3.3-5 V) in portable electronic applications or highside MOSFET gate drivers [303]. SOC power levels can often be limited by factors such as dielectric breakdown or narrow trenches when building capacitors in silicon; although highpower SC converters with large discrete capacitors have been reported and demonstrated, they have not yet seen widespread application [67].…”

Section: Applications and Comparison Of Step-up Dc-dc Convertersmentioning

confidence: 99%

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Step-Up DC–DC Converters: A Comprehensive Review of Voltage-Boosting Techniques, Topologies, and Applications

Forouzesh

Siwakoti

Gorji

et al. 2017

IEEE Trans. Power Electron.

1,540

666

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DC-DC converters with voltage boost capability are widely used in a large number of power conversion applications, from fraction-of-volt to tens of thousands of volts at power levels from milliwatts to megawatts. The literature has reported on various voltage-boosting techniques, in which fundamental energy storing elements (inductors and capacitors) and/or transformers in conjunction with switch(es) and diode(s) are utilized in the circuit. These techniques include switched capacitor (charge pump), voltage multiplier, switched inductor/voltage lift, magnetic coupling, and multistage/-level, and each has its own merits and demerits depending on application, in terms of cost, complexity, power density, reliability, and efficiency. To meet the growing demand for such applications, new power converter topologies that use the above voltage-boosting techniques, as well as some active and passive components, are continuously being proposed. The permutations and combinations of the various voltage-boosting techniques with additional components in a circuit allow for numerous new topologies and configurations, which are often confusing and difficult to follow. Therefore, to present a clear picture on the general law and framework of the development of next-generation step-up dc-dc converters, this paper aims to comprehensively review and classify various step-up dc-dc converters based on their characteristics and voltage-boosting techniques. In addition, the advantages and disadvantages of these voltage-boosting techniques and associated converters are discussed in detail. Finally, broad applications of dc-dc converters are presented and summarized with comparative study of different voltage-boosting techniques.

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Section: E Multistage/-levelmentioning

confidence: 99%

Section: Applications and Comparison Of Step-up Dc-dc Convertersmentioning

confidence: 99%

Step-Up DC–DC Converters: A Comprehensive Review of Voltage-Boosting Techniques, Topologies, and Applications

Forouzesh

Siwakoti

Gorji

et al. 2017

IEEE Trans. Power Electron.

1,540

666

View full text Add to dashboard Cite

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“…These limits, summarized in Table II for 5-level operation, are due to converter components [9], such as inductor current saturation or flying capacitor voltage ripple, and due to converter operation (i.e. resonance) [24]. In [9], the component frequency limitations are derived for 4-level operation.…”

Section: Frequency Limitationsmentioning

confidence: 99%

“…Because of this variation, the converter is unable to maintain ZVS in quasi-resonant operation without additional implementation complexity such as valley current detection and setting specific deadtimes for each current valley [22]. As detailed in [24], there are two resonant frequencies for the FCML converter based on the switching configuration when current flows through either one or two flying capacitors. The resonant frequency, f swRes , is given by the equation in Table II, where C ef f is given by either one or two series-connected flying capacitors, depending on the switch configuration.…”

Section: Frequency Limitationsmentioning

confidence: 99%

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Dynamic Level Changing for Full Range ZVS in Flying Capacitor Multi-Level Converters

Blackwell

Stillwell

Pilawa-Podgurski

2022

IEEE Open J. Power Electron.

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This paper presents a control technique for flying capacitor multi-level (FCML) converters to achieve zero-voltage switching (ZVS) across the full range of duty cycles, with application in high power density and high efficiency power converters. Previous works have used variable frequency control to enable ZVS at specific duty cycles in FCML converters, but have not been able to use these methods to enable ZVS across the full range. This work uses dynamic level selection and variable frequency control to increase inductor current ripple at duty cycle ranges for which ZVS was previously unattainable. An experimental 5-level FCML prototype has been built using GaN devices on a single-sided PCB to demonstrate this control technique. We demonstrate 4-level and 5-level operation with ZVS at duty cycles that are not possible with 5-level operation alone, as well as a dynamic level transition with active capacitor voltage balancing.

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Introduction

Renz¹,

Wicht²

2020

Integrated Hybrid Resonant DCDC Converters

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Resonant and multi-mode operation of flying capacitor multi-level DC-DC converters

Cited by 71 publications

References 12 publications

Step-Up DC–DC Converters: A Comprehensive Review of Voltage-Boosting Techniques, Topologies, and Applications

Step-Up DC–DC Converters: A Comprehensive Review of Voltage-Boosting Techniques, Topologies, and Applications

Dynamic Level Changing for Full Range ZVS in Flying Capacitor Multi-Level Converters

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