U.S. Philips Corporation

Lambert J Folmer

Teruo Hishiki

Johannes Ijntema

Jouw Van Den Akker

Jacob F Verrij

A device for determining the charge status of a battery (4) when it is discharged by a load (R.sub.L) and/or when it is charged by a power-supply circuit (1) in which a value representing the nominal charging time and discharging time respectively is stored in first (10) and second adjusting means (11) respectively and is applied to computing means (12). In response to clock pulses applied to the computing means by a clock means (13), the computing means calculate the charge status of the battery by expressing the elapsed discharging or charging time as a fraction of the adjusted discharging time and charging time respectively. The computed charge status is indicated by indicator means (14). During discharging and charging an actual charge status is detected by first (7) and second (16) detection means. In the case of a difference between the computed and the actual charge status, correction means (15) corrects the computed charge status and the value stored in the adjusting means (10, 11) is updated so that during a subsequent discharging or charging cycle the computed charge status conforms more closely to the actual charge status.

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Nijmegen, Netherlands

Lambert J Folmer