Battery charging circuit

摘要

A battery charging circuit includes a plurality of unit batteries that are connected in series; a current path forming unit that is connected between the unit batteries and forms a charging current path to one or more unit batteries selected by one or more selection signals; a control unit that senses the charging status of each of the plurality of the unit batteries, and generates the selection signals and controls the duty ratio according to the sensing results; and a charging electricity providing unit that controls the charging voltage provided to the charging current path forming unit according to the duty ratio of the charging control pulse.

主权项

1. A battery charging circuit for charging a plurality of unit batteries that are connected in series, the battery charging circuit comprising:
a current path forming unit including a plurality of current input units coupled in parallel to each other and a plurality of current output units coupled in parallel to each other, each current input unit having a series coupling with a corresponding current output unit, each unit battery being coupled between the series couplings of a corresponding pair of current input and current output units, the current path forming unit forming a charging current path to one or more of the unit batteries selected by one or more selection signals; a control unit that senses a charging status of each of the unit batteries, and generates the selection signals and controls a duty ratio of a charging control pulse according to the charging statuses; and a charging electricity providing unit that controls a charging voltage provided to the charging current path forming unit according to the duty ratio of the charging control pulse.