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摘要

A battery charger control system in which the charging current is switched on and off at repetitive intervals, the open circuit terminal voltage during the "off" periods being utilized to provide a control signal in order to vary the magnitude of the charging current during the "on" periods. The control signal is derived by extracting the resultant "I.R. Drop" at the battery terminals once the charging current has been switched off and then differentiating the rate of decay of the open-circuit terminal voltage of the battery. A voltage is then derived from the differential and used in one of three ways to control the magnitude of the charging current in order to progressively reduce its magnitude once gas generation has been detected as a result of a significant differential occuring.