Battery-powered device
First Claim
1. A device comprising:
- a rechargeable battery connectable to a load for energizing said load,a power-supply circuit for charging the battery and/or energizing the load,first detection means for detecting the expiration of a discharge time of the battery when the battery is connected to the load,a discharger for discharging the battery when the battery is disconnected from the load after detection of said expiration of said discharge time,second detection means for detecting a battery voltage substantially equal to a voltage threshold value,first time-measurement means for measuring a first time interval during which the battery is connected to the load after detection of said expiration of said discharge time and until detection of the voltage threshold value,second time-measurement means for measuring a second time interval during which the discharger is operative and the battery is disconnected from the load after detection of said expiration of said discharge time and until detection of the voltage threshold value, andcorrection means for correcting said discharge time depending on the weighted sum of said first time interval and said second time interval as measured by the first and the second time-measurement means and relative to a reference value.
1 Assignment
0 Petitions
Accused Products
Abstract
In a device where a load (RL) is powered by a battery (6) if a first detection device (100) detects that the expired discharge time measured by measurement means (40, 70) is equal to a first reference value stored in a memory (22), a first time measurement apparatus (40, 80) measures the time during which the load is powered by the battery. When 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 (9). Second time-measurement apparatus (50, 80) measure the time during which the discharger is operative until a second detection device (13) detects a battery voltage at which the battery may be regarded as fully discharged. After comparison of the sum of the time intervals measured by the first and the second time-measurement apparatus with a second reference value stored in a memory (21), a correction device corrects the reference value stored in a memory (22) in such the way that during a next discharge the sum of the time intervals measured by the first and the second time-measurement apparatus is in better agreement with the second reference value.
21 Citations
11 Claims
-
1. A device comprising:
-
a rechargeable battery connectable to a load for energizing said load, a power-supply circuit for charging the battery and/or energizing the load, first detection means for detecting the expiration of a discharge time of the battery when the battery is connected to the load, a discharger for discharging the battery when the battery is disconnected from the load after detection of said expiration of said discharge time, second detection means for detecting a battery voltage substantially equal to a voltage threshold value, first time-measurement means for measuring a first time interval during which the battery is connected to the load after detection of said expiration of said discharge time and until detection of the voltage threshold value, second time-measurement means for measuring a second time interval during which the discharger is operative and the battery is disconnected from the load after detection of said expiration of said discharge time and until detection of the voltage threshold value, and correction means for correcting said discharge time depending on the weighted sum of said first time interval and said second time interval as measured by the first and the second time-measurement means and relative to a reference value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
-
11. A dry-shaver comprising:
-
a motor, means coupling said motor to a device, said device comprising; a rechargeable battery connectable to the motor for energizing said motor, a power-supply circuit for charging the battery and/or energizing the motor, first detection means for detecting the expiration of a discharge time of the battery when the battery is connected to the motor, a discharger for discharging the battery when the battery is disconnected from the motor after detection of said expiration of said discharge time, second detection means for detecting a battery voltage substantially equal to a voltage threshold value, first time-measurement means for measuring a first time interval during which the battery is connected to the motor after detection of said expiration of said discharge time and until detection of the voltage threshold value, second time-measurement means for measuring a second time interval during which the discharger is operative and the battery is disconnected from the motor after detection of said expiration of said discharge time and until detection of the voltage threshold value, and correction means for correcting said discharge time depending on the weighted sum of said first time interval and said second time interval as measured by the first and the second time-measurement means and relative to a reference value.
-
Specification