| 摘要 |
<p>If when a load (RL) is powered by a battery (6) first detection means (100) detect that the expired discharge time measured by measurement means (40, 70) is equal to the first reference value stored in a memory (22), first time measurement means (40, 80) measure the time during which the load (RL) is powered by the battery (6). When the load (RL) is switched off and is not connected to the mains voltage via a power-supply circuit (1), the battery (6) is discharged by a discharger (9). Second time-measurement means (50, 80) measure the time during which this discharger (9) is operative until second detection means (13) detect a battery voltage for which the battery (6) may be regarded as fully discharged. After comparison of the sum of the time intervals measured by the first and the second time-measurement means with a second reference value stored in a memory (21), the correction means (10) correct the reference value stored in a memory (22) in such a way that during a next discharge the sum of the time intervals measured by the first and the second time-measurement means is better in agreement with the second reference value.</p> |
