Charging circuit for nickel-metal hybrid and nickel-cadmium accumulators has load resistance on collector of power transistor that limits charging current; the transistor switching off charging current after reaching defined cell voltage

摘要

The charging circuit has a load resistance on the collector of a power transistor that limits the charging current. The power transistor switches off the charging current after reaching a defined cell voltage. A switching transistor compares the cell voltage with a diode voltage. The switching transistor between the collector and emitter conducts if the cell voltage exceeds the diode voltage plus the emitter-base voltage of the transistor.