Uninterruptible power supply diagnosing remaining battery capaci

Details Uninterruptible power supply diagnosing remaining battery capaci Uninterruptible power supply diagnosing remaining battery capaci

1990-07-23

1992-09-15

Pellinen, A. D.

Electrical transmission or interconnection systems

Plural supply circuits or sources

Substitute or emergency source

307 46, 320 32, H02J 704, H02J 906

Patent

active

051480433

ABSTRACT:
A power supply is energized by an external power source and a battery, and supplies electric power to a load. The power supply includes a battery voltage detector and a current detector for detecting a discharge current from the battery. The remaining capacity of the battery is detected in accordance with a change in the battery voltage when the external power source is free of power failure. The battery voltage change is defined as the difference between an initial voltage of the battery and an active voltage of the battery obtained when the battery is discharged by the detected discharge current for a predetermined period of time.

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patent: 4611289 (1986-09-01), Coppola
patent: 4641042 (1987-02-01), Miyazawa
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patent: 4820966 (1989-04-01), Fridman
patent: 5025202 (1991-06-01), Ishii et al.
patent: 5061898 (1991-11-01), Oram et al.

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