Two-Mode Controlled Single/Dual-Input DC-AC Inverter with Wide-range DC Input

Zhe Zhang, Xuefeng Chen

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    Abstract

    This paper presents a two-mode controlled step-up inverter (TMCSI), which is capable of handling single or dual inputs with a wide range of dc input voltage. In comparison of traditional multi-stage dc/dc power conversion systems, the power conversion stage is reduced and the voltage/current stress of device is significantly alleviated without using high-voltage dc-bus capacitors. As a result, the reliability and overall conversion efficiency are improved accordingly. By combining the two working modes, the proposed inverter achieves uniform distribution of duty ratio under single/dual-input with a wide range of input voltage, and thereby is very suitable for systems having large input voltage variation. Moreover, based on the dual-input TMCSI a novel power allocation method is also proposed to improve the system load-bearing ability. The power allocation method is controlled
    separately from two working modes that allows the two-input sources directly supply the ac load simultaneously. In this paper, topology derivation, two-mode control strategy,
    characteristics of steady principle and design criteria for the key circuit parameters are systematically analyzed, and important conclusions are obtained. Finally, the experimental
    results from the single/dual-input 500VA 96-192VDC input and 220VAC/50Hz output inverter prototype verify the effectiveness of the proposed TMCSI topology and its associated power regulation approach.
    Original languageEnglish
    JournalI E E E Transactions on Power Electronics
    Pages (from-to)36
    Number of pages5
    ISSN0885-8993
    DOIs
    Publication statusPublished - 2021

    Keywords

    • Buck-Boost converter
    • Full bridge inverter
    • Step-up inverter
    • Two-mode control
    • Wide range input voltage

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