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European Patents via NewsEdge Corporation :

Pub. Number EP0015951Appl. Data EP79900408 19790412Applicant BELE INVENT AKTIEBOLAGRöstlund, Karl JohnieInventor(s) RÖSTLUND, Karl JohnieTitle METHOD AND APPARATUS FOR RECHARGING DRY BATTERIESAbstract A method and an apparatus for recharging dry batteries, wherebythe dry batteries (4) are charged with one of the periods (7) of anintermittently pulsating alternate current, whereas the batteries (4) areallowed to discharge somewhat during the periods between the charging pulses(7). The charging current is balanced according to the charge condition of thebatteries so that the batteries irrespectively of the charge condition arecharged with as constant average current as possible with possible variationsdepending on the sensitivity of the charging components to temperature orcurrent strength. The apparatus comprises a transformer for stepping down netcurrent to suitable charging voltage, a diode (D1) for letting throughintermittent charging pulses, a resistor (R1) connected parallelly over thediode (D1), terminals for one or several dry batteries between the diode (D1)and the resistor (R1) on one hand and a second pole terminal (2) on the otherhand. Parallelly over the dry batteries (4) are connected a Zener-diode (D1)and in series therewith a PTC- resistor (R3), whereby the PTC-resistor (R3) isdesigned so as to balance the average charging current over the dry batteries(4) to be maintained as constant as possible.If you would like to purchase a copy of this patent, please call MicroPatent at 800-648-6787.

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