Lithium-ion battery charger power limitation method
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United States of America Patent
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Dec 16, 2003
Grant Date -
Jul 31, 2003
app pub date -
Jan 30, 2002
filing date -
Jan 30, 2002
priority date (Note) -
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status (Latency Note)
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Abstract
A method of charging a battery from a power source is provided. The method includes providing a charge circuit in series with the battery and the power source. A charging current flowing to the battery and a voltage across the charge circuit are sensed. The power dissipated in the charge circuit is computed based on the charging current and the voltage across the charge circuit. During a first operating mode, the charging current is controlled so that the power dissipated in the charge circuit is about a predetermined maximum dissipation. During a second operating mode, the charging current is limited to a predetermined current level. During a third operating mode, the charging current is controlled so that the battery voltage is about a predetermined voltage level.
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