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A Control Method for an Uninterruptible Power Supply with a Bidirectional Cycloconverter
Tadahito AOKI Katsuichi YOTSUMOTO Seiichi MUROYAMA
IEICE TRANSACTIONS on Communications
Publication Date: 1992/01/25
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.