Electricity: battery or capacitor charging or discharging – Serially connected batteries or cells – With discharge of cells or batteries
Patent
1992-03-19
1993-09-28
Stephan, Steven L.
Electricity: battery or capacitor charging or discharging
Serially connected batteries or cells
With discharge of cells or batteries
320 21, H02J 704, H02J 710, H01M 1044
Patent
active
052489280
ABSTRACT:
A charger 10 includes facility, such as a capacitor 14, for establishing a constant current source which is rectified by rectifier 16 to provide a supply of charging current at a single level in each of two successive periods of a charging cycle. The output of rectifier 16 is coupled through a SCR 26 to a battery B to be charged. Under control of a timer 28, SCR 26 remains conductive for a prescribed continuous period to facilitate the supply of the single-level charging current to battery B during a full charge or first period mode at a 100% duty cycle. At the end of the prescribed first period, a timer 36 then controls the on-off operation of SCR 26 to facilitate the supply of the single-level charging current during a trickle charge mode at a 20% duty cycle. In an alternative embodiment, a charge 100 includes four timers 118, 120, 122 and 124 which provide for three phases or modes of operation in which a single-level charging current is supplied to battery B at a duty cycle of 75% during a first of the three periods, at a duty cycle of 100% during a second of the three periods and at a duty cycle of 12.5% during a third of the three periods.
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Black & Decker Inc.
Hoofnagle J. Bruce
Stephan Steven L.
To E.
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