Constant current charging, followed by constant voltage charging, responsive to condition
A charging circuit and a charging method by the charging circuit that allow a stable charging operation are provided. The charging method of charging a battery from a charging power supply according to a constant current constant voltage charging system includes the steps of increasing a charging current for each predetermined current level step by step at a time of constant current charging, thereby performing the constant current charging, and stopping the increase of the charging current and continuing the charging maintaining a predetermined minimum chargeable voltage determined by the battery in advance, when it is detected that a supply voltage from the charging power supply has assumed the predetermined minimum chargeable voltage.
NEC Corporation
H Y H H
H01M Y02E H01M H02J
additional additional inventional inventional
Hironori
Yamada