Battery full-charge detection for charge-and-play circuits

Details Battery full-charge detection for charge-and-play circuits Battery full-charge detection for charge-and-play circuits

2006-12-12

2011-10-11

Diao, M'baye (Department: 2858)

Electricity: battery or capacitor charging or discharging

Battery or cell charging

Time control

C320S128000

Reexamination Certificate

active

08035354

ABSTRACT:
The present invention relates to a battery charge circuit (100) in a charge-and-play mode capable to reliably determine the completion of a battery charging operation has been described. Such a determination takes into account the behavior of the battery charge circuit (100) with respect to the temperature, the activity of the circuitry (30) and the source current limitation. Thus, a distinction can be made between a decrease of the battery charge current ICHG below the end-of-charge current level caused by the full-charge state of the battery (20) and by the activation of temperature and current regulation circuits. Furthermore, the battery charge circuit (100) is also configured such that it can be warned both that the activity of the circuitry (30) is to be limited and, by a timer (800) measuring the time interval during which the battery charge current ICHG has been reduced to zero, that the battery (20) is being discharged.

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