Analysis and Design of a High Power Density Flying-Capacitor Multilevel Boost Converter for High Step-Up Conversion

Liao, Zitao; Lei, Yutian; Pilawa-Podgurski, Robert C. N.

doi:10.1109/tpel.2018.2858184

Cited by 62 publications

(21 citation statements)

References 35 publications

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“…The MAD converter has a higher cost than the Buck converter mainly due to additional isolated power supplies. Similar cost increases have also been found in the SCCs [7,13] and the converters hybridizing an SCC and a Buck converter [14][15][16][17] which are commonly used in certain applications [7,13,14]. Although the cost of the MAD converter is higher than the cost of the Buck converter, the output voltage ripple reduction is significant, for example, 72% at fsw =100kHz or 99% at fsw=1MHz as shown in Fig.…”

Section: Comparison Between the Proposed Mad Converter And Buck Cosupporting

confidence: 59%

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Mixed Analog–Digital (MAD) Converters for High Power Density DC–DC Conversions

Zhao

Shen

Ying

et al. 2020

IEEE Trans. Power Electron.

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Conventional switched-mode power supplies (SMPSs) have intrinsic instantaneous power pulsation at the switching frequency thus require bulky filters. To improve the power density, this paper proposes a concept named the Mixed Analog-Digital (MAD) which can be applied as DC-DC converters. By inserting an analog voltage component between the load and source, the output voltage naturally has much smaller fluctuation thereby much smaller passive filter is required. Simulations and experiments validate that the proposed MAD concept can be applied as DC-DC converters to significantly increase the power density.

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Section: Comparison Between the Proposed Mad Converter And Buck Cosupporting

confidence: 59%

“…The comparison between (12) and (13) shows that ΔVo in the MAD converter is reduced because ΔVo_MAD is proportional to 1/fsw 3 while ΔVo_buck of the DCM Buck converter is proportional to 1/fsw. Moreover, the coefficient in (12) is smaller than the coefficient in (13). Fig.…”

Section: Comparison Between the Proposed Mad Converter And Buck Comentioning

confidence: 99%

Mixed Analog–Digital (MAD) Converters for High Power Density DC–DC Conversions

Zhao

Shen

Ying

et al. 2020

IEEE Trans. Power Electron.

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“…To extend the capabilities of traditional power electronics converters, a clear trend is visible towards topologies that implement more switches and capacitors to achieve higher power densities compared to traditional designs that rely on magnetics [67]. Numerous examples can be found in high step-down converters [68][69][70], high step-up converters [56,71,72] and PV or wind power inverters [73][74][75][76].…”

Section: Methodsmentioning

confidence: 99%

Practical Considerations for Designing Reliable DC/DC Converters, Applied to a BIPV Case

et al. 2020

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State-of-the-art reliability assessment typically starts from a given circuit topology, for which the most suitable components are selected using a Physics of Failure analysis. This paper, however, addresses the topology selection stage, which is the foundation in designing reliable converters. Based on an overview of the reliability performance of different components, a methodology is presented as a guideline for comparing topologies to one another. The focus is directed at practical consequences associated with certain designs. Furthermore, an overview is provided on the latest developments in component technology reliability improvements. The developed methodology is mainly intended for demanding applications, where long lifetimes are required or elevated ambient temperatures are present. After the topology selection, an overview of possibilities is given that allows further increasing converter availability. Finally, the methodology is applied to the design of module level converters for building integrated photovoltaics, which is a high temperature application with a high desired lifetime. A prototype and experimental results are presented.

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“…Another advantage is that the gate signals of the switches are phase-shifted by half the switching period Ts, leading to an effective ripple current reduction in the input. The main disadvantage of this converter is that two inductors and a transformer are used, making it rather bulky compared to, for example, switched capacitor or flying capacitor boost converters [11,12]. An overview of the used components for evaluating the converter is given in Table 1.…”

Section: Electrical Modelmentioning

confidence: 99%

A mission profile-based reliability analysis framework for photovoltaic DC-DC converters

Sande

Ravyts

Sangwongwanich

et al. 2019

Microelectronics Reliability

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Reliability of DC-DC converters is important in photovoltaic (PV) applications like building integrated PV systems, where the module-level converter may be stressed significantly. Understanding and predicting the most failing components with accurate degradation models in such systems enables the design for reliability. In this paper, a photovoltaic mission profile-based reliability analysis framework is proposed where the inputs and models of the framework can be adjusted according to the converter topology, the components and the failure mechanisms under investigation. The framework is demonstrated by comparing the influence of two different one-year mission profiles on the solder joint degradation of a MOSFET in an interleaved boost converter. This is done by using an electro-thermal circuit simulation in PLECS and a finite element MOSFET model in COMSOL. In future work, the mesh and the geometry of the solder joint can be adjusted to more closely match the practical stress-cycle (S-N) curve used to determine the lifetime. This framework allows for exploring more accurate models or even simplify parts with low sensitivity in order to obtain a thorough understanding of their accuracy and to determine the overall converter reliability.

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Analysis and Design of a High Power Density Flying-Capacitor Multilevel Boost Converter for High Step-Up Conversion

Cited by 62 publications

References 35 publications

Mixed Analog–Digital (MAD) Converters for High Power Density DC–DC Conversions

Mixed Analog–Digital (MAD) Converters for High Power Density DC–DC Conversions

Practical Considerations for Designing Reliable DC/DC Converters, Applied to a BIPV Case

A mission profile-based reliability analysis framework for photovoltaic DC-DC converters

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