Battery-powered device

Details Battery-powered device Battery-powered device

1987-11-16

1989-07-18

Hickey, R. J.

Electricity: battery or capacitor charging or discharging

Serially connected batteries or cells

With discharge of cells or batteries

320 37, 320 48, G08B 2100, H02J 700

Patent

active

048496812

ABSTRACT:
In a device where a load (R.sub.1) is powered by a battery (6), if a detection means (10) detects a battery voltage below a first threshold value (V.sub.1) defined by an adjustable voltage source (20), a first time-measurement means (40, 50) measure the time interval during which the load 6 is powered by the battery (6), at a voltage below the first threshold value. If subsequently, the load is switched off and is not connected to the AC supply voltage via a power-supply circuit (1), the battery is discharged by a discharger (30). Second time-measurement means (40, 60) measure the time interval during which the discharger is operative until the detection means detect a battery voltage below a second threshold value (V.sub.2), which is defined by a voltage source (25) and at which the battery may be regarded as fully discharged or drained. After comparison of the sum of the time intervals measured by the first and the second time-measurement means with a reference value, correction means (70) correct the first threshold value in such a way that during a next discharge the time measured is more in agreement with the reference value.

REFERENCES:
patent: 4455523 (1984-06-01), Koenck
patent: 4743831 (1988-05-01), Young

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