Electricity: battery or capacitor charging or discharging – Serially connected batteries or cells – With discharge of cells or batteries
Patent
1991-05-13
1993-10-05
Stephan, Steven L.
Electricity: battery or capacitor charging or discharging
Serially connected batteries or cells
With discharge of cells or batteries
320 15, H02J 700
Patent
active
052508919
ABSTRACT:
A battery charger for charging a battery from a DC source includes a step-down convertor coupled to the battery and to a voltage source. When the voltage required to charge the battery is less than that of the DC source, the step-down convertor is connected directly to the source and if the source voltage is less than that required to charge the battery, a step-up convertor is connected between the source and the step-down convertor. Control circuits are provided for sensing the presence of a battery pack, for initiating the flow of charging current, for pulse-width modulating the flow of charging current to the battery and for terminating the flow of charging current when the battery is fully charged as sensed by a predetermined battery temperature or a predetermined drop in battery charging voltage from a peak value. A timer or a latching circuit prevents the resumption of charging current flow until the battery being charged has been removed or replaced.
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Davidson Ben
Milwaukee Electric Tool Corporation
Stephan Steven L.
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