Charge-discharge control circuit, over-charge prevention circuit ,and over-discharge prevention circuit

摘要

The charge-discharge control circuit prevents over-charge and over-discharge of a plurality of series connected batteries. It is provided with a detection circuit to determine the state of charge and discharge of the batteries, at least one bypass circuit connected in parallel with one of the batteries, and a connection circuit which, in response to results from the detection circuit, selectively connects the bypass circuit to a battery determined to be in an approximately fully charged state or approximately fully discharged state.