Bidirectional Converter with Multi-stage FETs Featuring Voltage Balance Control Function Using Variable Capacitors

This paper presents a bidirectional converter with multi-stage FETs featuring voltage balance control function using variable capacitors. The proposed converter is constructed using low-voltage Si-FETs in a series connection, and it improves the voltage balance between the drain-source voltages of t...

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Bibliographic Details
Published inIEEJ JOURNAL OF INDUSTRY APPLICATIONS Vol. 140; no. 3; p. 168
Main Authors Ishikura, Yuki, Hosotani, Tatsuya, Yamamoto, Masayoshi, 祐樹, 石倉, 達也, 細谷, 真義, 山本
Format Journal Article
LanguageJapanese
Published Tokyo Japan Science and Technology Agency 01.01.2020
Subjects
Capacitors
Converters
Electric potential
Energy conversion efficiency
Equivalent circuits
Figure of merit
Mathematical analysis
Maximum power
Voltage
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Summary:This paper presents a bidirectional converter with multi-stage FETs featuring voltage balance control function using variable capacitors. The proposed converter is constructed using low-voltage Si-FETs in a series connection, and it improves the voltage balance between the drain-source voltages of the series connected FETs in the OFF period. Using the converter figure of merit (FOM), which can estimate the converter losses from the specifications of the FETs, the effectiveness of the proposed converter is compared to that of a converter using SiC-FETs. The factors of the voltage unbalance are analytically clarified using the equivalent circuit. The principle of voltage balance control function using the variable capacitor is discussed. The experimental results show that the proposed converter can achieve a maximum power conversion efficiency of 99.2%.
ISSN:2187-1094
2187-1108
DOI:10.1541/ieejias.140.168