Charging circuit for secondary battery, power supply switching method in charging circuit for secondary battery, and power supply unit
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United States of America Patent
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Aug 30, 2011
Grant Date -
May 7, 2009
app pub date -
Feb 2, 2007
filing date -
Feb 15, 2006
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A charging circuit charges a secondary battery by using a first direct current power supply that generates and outputs a first voltage. A highest voltage among the first voltage of the first direct current power supply, a second voltage generated from power supplied from outside, and a secondary battery voltage of the secondary battery is supplied as a power supply to the charging circuit.
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