New Switching Control for Synchronous Rectifications in Low-Voltage Paralleled Converter System without Voltage and Current Fluctuations

Hiroshi SHIMAMORI
Teruhiko KOHAMA
Tamotsu NINOMIYA

Publication
IEICE TRANSACTIONS on Electronics   Vol.E88-C    No.3    pp.395-402
Publication Date: 2005/03/01
Online ISSN: 
DOI: 10.1093/ietele/e88-c.3.395
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Electronic Circuits
Keyword: 
synchronous rectifier,  paralleled converter system,  interference,  inhalation current,  circulating current,  fluctuation,  

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Summary: 
Paralleled converter system with synchronous rectifiers (SRs) causes several problems such as surge voltage, inhalation current and circulating current. Generally, the system stops operation of the SRs in light load to avoid these problems. However, simultaneously, large voltage fluctuations in the output of the modules are occurred due to forward voltage drop of diode. The fluctuations cause serious faults to the semiconductor devices working in very low voltage such as CPU and VLSI. Moreover, the voltage fluctuations generate unstable current fluctuations in the paralleled converter system with current-sharing control. This paper proposes new switching control methods for rectifiers to reduce the voltage and current fluctuations. The effectiveness of the proposed methods is confirmed by computer simulation and experimental results.