System for supplying power to an apparatus and method for the as

Details System for supplying power to an apparatus and method for the as System for supplying power to an apparatus and method for the as

1995-01-17

1996-09-03

Gaffin, Jeffrey A.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361 90, 361115, H02H 300

Patent

active

055529534

ABSTRACT:
A system for supplying power to an apparatus (170, 175) with a power-storage device (200) for storing electric power, a first measuring device (310) for measuring a first electrical quantity of the power-storage device (200), a time-determining device (360) for determining the time taken for the first electrical quantity to reach a first level, a second measuring device (320) for measuring a second electrical quantity of the power-storage device (200) and a comparator (330) for comparing the second electrical quantity relative to the determined time with a stored typical time-characteristic of the second electrical quantity. Thereby a method of assessing the lifetime and capacity of the power-storage device (200) is used with as a first step (500) the measurement of a first electrical quantity of the power-storage device (200), as a second step (510) the determination of the time taken for the first electrical quantity to reach a first level, as a third step (520) the measurement of a second electrical quantity of the power-storage device (200), as a fourth step (530) the comparison of the second electrical quantity relative to the determined time with a stored typical time-characteristic of the second electrical quantity and as a fifth step (540) the evaluation of the comparison from the fourth step for an assessment of the lifetime and capacity of the power-storage device (200).

REFERENCES:
patent: 4514694 (1985-04-01), Finger
patent: 5179337 (1993-01-01), Staarman et al.
patent: 5250904 (1993-10-01), Salander et al.

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