A Control Method for an Uninterruptible Power Supply with a Bidirectional Cycloconverter

Tadahito AOKI  Katsuichi YOTSUMOTO  Seiichi MUROYAMA  

IEICE TRANSACTIONS on Communications   Vol.E75-B   No.1   pp.34-41
Publication Date: 1992/01/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Power Supply
uninterruptible power supply,  inverter,  cycloconverter,  control method,  power electronics,  

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This paper describes a new configuration and control method for an uninterruptible power supply (UPS) with a bidirectional cycloconverter. When commercial AC power is operating normally, the load is supplied by commercial AC power and the bidirectional cycloconverter operates as a battery charger. During interruptions of commercial AC power, the bidirectional cycloconverter operates as an inverter and supplies AC power to the load. Unlike a conventional UPS, this new configuration does not require a battery charger, so it can be small, light-weight, cost-effective, and highly efficient. The output voltage characteristics and the transient voltage drop in the output when commercial AC power fails are also discussed by numerical analysis and experiments.