Charging apparatus that can recharge different types of batteries without overcharging them
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United States of America Patent
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Sep 2, 2014
Grant Date -
Mar 8, 2012
app pub date -
Sep 6, 2011
filing date -
Sep 6, 2011
priority date (Note) -
Withdrawn
status (Latency Note)
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Abstract
A charging device can prevent overcharging by coping with a plurality of cell voltages without increasing a circuit area and current consumption. The charging device selects one of at least two judgment voltages in response to a select signal determined depending on a chargeable voltage of a secondary battery. The charging device compares a comparison voltage based on a voltage of a lower stream of a back flow prevention unit with the selected judgment voltage to detect a fully charged state of the secondary battery. The charging device interrupts supply of charging current to the back flow prevention unit upon detecting the fully charged state.
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