Sequential battery charging method for preventing under-charging and over-charging of battery
First Claim
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1. A sequential battery charging method comprising:
- charging a battery during a first time interval of a first predetermined duration regardless of a change in a voltage of the battery;
charging the battery and sensing the voltage of the battery during a second time interval of a second predetermined duration succeeding the first time interval;
ceasing charging the battery during the second time interval upon sensing of a predetermined drop of the voltage of the battery from a peak voltage of the battery during the second time interval, wherein charging of the battery in the second time interval is continued throughout the second time interval if the predetermined drop of the voltage of the battery from the peak voltage of the battery is not sensed during the second time interval;
charging the battery and sensing the voltage of the battery, if the charging of the battery is continued throughout the second time interval, during a third time interval succeeding the second time interval; and
ceasing charging of the battery during the third time interval upon sensing of the peak voltage of the battery during the third time interval.
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Abstract
A battery is charged in three successive charging intervals. In the first charging interval, charging is continued For a fixed time regardless of battery voltage change. In the second charging interval, charging is ceased by detecting a voltage drop from a peak battery voltage. In the third charging interval, charging is ceased by detecting the peak battery voltage. Early disconnect as well as over-charging are prevented.
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5 Claims
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1. A sequential battery charging method comprising:
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charging a battery during a first time interval of a first predetermined duration regardless of a change in a voltage of the battery; charging the battery and sensing the voltage of the battery during a second time interval of a second predetermined duration succeeding the first time interval; ceasing charging the battery during the second time interval upon sensing of a predetermined drop of the voltage of the battery from a peak voltage of the battery during the second time interval, wherein charging of the battery in the second time interval is continued throughout the second time interval if the predetermined drop of the voltage of the battery from the peak voltage of the battery is not sensed during the second time interval; charging the battery and sensing the voltage of the battery, if the charging of the battery is continued throughout the second time interval, during a third time interval succeeding the second time interval; and ceasing charging of the battery during the third time interval upon sensing of the peak voltage of the battery during the third time interval. - View Dependent Claims (2, 3, 4, 5)
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Specification