Patent ID: 9184612
Filing Date: 2015-11-10
Classification: H02J,Y02E

Abstract:
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.