Yuasa Battery Co., Ltd.

Akira Kita

Kenjiro Kishimoto

Tomoki Matsui

Yoshio Kasai

There is disclosed an improved uninterruptible power system used as a back-up power supply for a computer or communication equipment. The system comprises a rectifier for rectifying AC power from a power line, such as the utility line, an inverter for converting the DC power from the rectifier to AC power, a sealed lead-acid battery connected with the junction of the rectifier and the inverter via a first switch, a charger for supplying charging power from a power line to the battery via a second switch, and a control signal generator. The generator monitors the voltage of a power line and the closed circuit voltage of the battery. Usually, the two switches are opened. In the event of the failure of a power line, the generator closes the first switch to supply the load with electric power. After a power line has been recovered, the second switch is closed to charge the battery via the charger only for a calculated short time.

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Otoguni, Japan

Akira Kita