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A PCCM ZVZCS Modulation Scheme for Full-Bridge-Boost Converter With Wide Input and Output Voltage Ranges

Abstract

The full-bridge-boost (FB-Boost) converter is a popular candidate for applications with wide ranges of input and output voltages and galvanic isolation. However, previous modulation schemes for the FB-Boost converter cannot achieve zero-voltage-switching (ZVS) and/or zero-current-switching (ZCS) of all the switches, which limits the improvement of the efficiency and limits the increase of the switching frequency for higher power density. In this article, a pseudo-continuous conduction mode (PCCM) ZVZCS modulation scheme is proposed for the FB-Boost converter. With the proposed scheme, the ZVS and/or ZCS of all switches can be achieved over the whole operating range. In addition, the RMS of the inductor current is minimized to optimize the efficiency. Moreover, in the proposed PCCM ZVZCS modulation scheme, the switching frequency is constant and modulation mode transitions do not exist within entire operating range. A 1000W FB-Boost prototype with input voltage range of 100-200V and output voltage range of 200-400V is built for experimental verification.

article Article

date_range 2024

language English

link Link of the paper

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Liu Feiming

Xu Jianping

Chen Zhengge

Wang Zhifu

Deng Kai

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Featured Keywords

Modulation

Zero voltage switching

Voltage

Switches

Zero current switching

Transformers

Inductors

Full-bridge-boost (FB-Boost)

galvanic isolation

wide voltage range

zero-current-switching (ZCS)

zero-voltage-switching (ZVS)

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Effect of corrosion on flexural strength of reinforced concrete beams with polypropylene fibers

Abstract

An experimental study was performed to investigate the effects of polypropylene fibers on uncorroded and corroded reinforced concrete beams. Three different volume fractions of polypropylene fibers having 0, 0.5, and 1.5%, were tested at four corrosion levels of 0% and approximately 5, 7, and 9%. A full scale of an accelerated corrosion pool was used for the accelerated corrosion process. Reinforced concrete beams were used for an under monotonic bending test. The contribution of the actual corrosion levels of transverse and longitudinal reinforcement bars to the total corrosion levels were obtained from reinforcement bars fully extracted from concrete. Flexural strength, bond-slip, and moment-curvature relationships were examined for uncorroded and corroded reinforced concrete beams. A new model was developed to predict the flexural strength of corroded reinforced concrete beams. The proposed model for predicting the residual flexural strength of corroded beams was compared with test data published in previous studies. Furthermore, a novel model is presented for improved predictions between the actual and theoretically estimated corrosion mass losses, based on Faraday’s law, with the aid of fully extracted reinforcement bars. The model used to predict the flexural strength of corroded reinforced concrete beams with large sizes demonstrated good agreement with current and previously published literature data. In the case of corroded beams comprising differing amounts of polypropylene fibers, the performance of the corroded beams was limited by a fiber volume fraction of 1.5% at low corrosion levels.

article Article

date_range 2018

language English

link Link of the paper

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