Reduction of a boost inductance using a switched capacitor DC-DC converter

Itoh, Jun‐ichi; Matsuura, Koichi; Orikawa, Koji

doi:10.1109/icpe.2011.5944378

Cited by 32 publications

(21 citation statements)

References 7 publications

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“…For example, the multi-level converter [5], [17] can also reduce the device voltages, and hence utilize lower voltage devices. However, since the switch and capacitor rms current ratings are not reduced, the multi-level approach does not achieve the improvements in capacitor size and cost or in overall system efficiency that is possible using the proposed composite architecture.…”

Section: New Boost Composite Converter Architecturementioning

confidence: 99%

A 98.7% Efficient Composite Converter Architecture With Application-Tailored Efficiency Characteristic

Chen

Sabi

Kim

et al. 2016

IEEE Trans. Power Electron.

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A DC-DC boost composite converter architecture is introduced that can lead to optimized efficiency over a range of operating points dictated by the application requirements. The composite converter system employs dissimilar modules to minimize the ac power losses in the indirect power conversion paths. It is composed of three converter modules: buck converter, boost converter, and a dual active bridge converter that operates as a DC Transformer (DCX). Each module processes partial power, with reduced voltage rating. With the same semiconductor area and same magnetics volume, substantial efficiency improvements and reductions in capacitor size are achieved relative to a conventional boost architecture. It is possible to design each module to optimize efficiency over a wide operating range, including pass-through modes that exhibit very low loss. A 10 kW boost composite converter is experimentally demonstrated having 98.7% efficiency at a critical partial power point, with similar very high efficiencies achieved over a wide operating range.

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Section: New Boost Composite Converter Architecturementioning

confidence: 99%

A 98.7% Efficient Composite Converter Architecture With Application-Tailored Efficiency Characteristic

Chen

Sabi

Kim

et al. 2016

IEEE Trans. Power Electron.

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“…Nevertheless, the voltage to which the active devices are exposed is the output voltage. To reduce the voltage stress on devices, three-level and Flying capacitor Boost converters [14][15] can be used as depicted in Fig. 3.…”

Section: Introductionmentioning

confidence: 99%

A Soft-Switched Asymmetric Flying-Capacitor Boost Converter With Synchronous Rectification

Lefèvre

Mollov

2016

IEEE Trans. Power Electron.

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The multi-level Flying Capacitor Boost converter was analysed for asymmetric voltage operation-this permits loss optimisation that takes advantage of different voltage class MOSFETs. A cost-motivated design of a suitable ZVZCS snubber is then developed that permits a great reduction of inductor size. With the proposed snubber, Synchronous rectification operation is compared to that of diode-Boost, with a particular attention to the contribution of non-linear MOSFET parasitics. Experimental results from a 2kW/30kHz prototype justify the effectiveness of this solution with a conversion efficiency around 99%0.1% for a wide load range.

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“…Therefore, the inductance of an input inductor can greatly be reduced for the FCBC topology (4) . Theoretically, the inductance of an input inductor is proportional to the number of windings.…”

Section: Inductance Of An Input Inductormentioning

confidence: 99%

“…Moreover, by considering multilevel structure topologies on the FCBC, the inductance and core volume of the input inductors can also be reduced (1)- (4) . However, the interleaved circuit topology and multilevel circuit structure introduce circuit complexity.…”

Section: Introductionmentioning

confidence: 99%

“…The FCBC with an input inductor has several advantages over a conventional DC-DC boost converter. The FCBC requires only a small input inductor and the suppression of an input inrush current due to the existing of an input inductor compared to a conventional FCBC without an input inductor (1)- (4) . In addition, a number of researchers have reported that interleaved circuit topologies can be considered for conventional DC-DC boost converters.…”

Section: Introductionmentioning

confidence: 99%

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Size Reduction of DC-DC Converter using Flying Capacitor Topology with Small Capacitance

et al. 2014

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The purpose of the present paper is to analyze the input inductor design and to establish the relationship between the capacitance of the flying capacitor and the output voltage ripple in order to reduce the size and weight of the flying capacitor DC-DC boost converter (FCBC). The inductance of the input inductor is designed by considering the maximum input current ripple, and the experimental results are used to confirm that the input current ripple is within the designed value. Furthermore, according to the design specifications, the required inductance of an input inductor is approximately 25% of that of a conventional two-level DC-DC boost converter, and the required inductor core volume is approximately 35% of that of a conventional two-level DC-DC boost converter. Moreover, the capacitance of the flying capacitor and the output voltage ripple are confirmed to be independent of each other. Theoretically, this is because the time constant of the output capacitance and the output resistance of the FCBC is larger than the switching period of the switching frequency. This finding is confirmed by the simulation and experimental results of the present study. On the basis of this finding, the capacitance of the flying capacitor can be estimated and designed without considering the output voltage ripple. Moreover, the achieved maximum efficiency of the designed FCBC is 98.5% of the output power at 1 kW.

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Reduction of a boost inductance using a switched capacitor DC-DC converter

Cited by 32 publications

References 7 publications

A 98.7% Efficient Composite Converter Architecture With Application-Tailored Efficiency Characteristic

A 98.7% Efficient Composite Converter Architecture With Application-Tailored Efficiency Characteristic

A Soft-Switched Asymmetric Flying-Capacitor Boost Converter With Synchronous Rectification

Size Reduction of DC-DC Converter using Flying Capacitor Topology with Small Capacitance

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