Electricity: battery or capacitor charging or discharging – Battery or cell discharging – With charging
Patent
1997-12-10
1998-11-03
Tso, Edward
Electricity: battery or capacitor charging or discharging
Battery or cell discharging
With charging
320137, 320158, H01M 1044, H01M 1046
Patent
active
058314164
ABSTRACT:
A battery charging apparatus (12) includes a voltage regulator arrangement (14), a charging transistor (16), a switching transistor (18), and preferably an operational status indicating arrangement (20). The voltage regulator arrangement (14) receives an input voltage signal from a voltage source (22) and produces a regulated voltage output to be applied to a battery (10) to be charged. The charging transistor (16) is connected with its collector-emitter current path completing a charging circuit from the voltage regulator arrangement (14) through the battery (10) to be charged and is forward biased in normal operation by a signal derived from the regulated voltage output. A switching transistor (18) has its collector-emitter current path connected in parallel with the battery (10) and collector-emitter current path of the charging transistor (16) to complete a bypass circuit around the battery. The base of the switching transistor (18) is connected to receive a biasing signal derived from the voltage at a reference point between the battery (10) and the collector-emitter current path of the charging transistor (16). In a short circuit or reverse polarity condition across the battery connecting terminals (26, 28), the voltage signal applied to the base of the switching transistor (18) causes the switching transistor (18) to conduct, reducing the voltage signal applied to the base of the charging transistor (16) and causing the charging transistor (16) to become non-conductive across its collector-emitter current path. By turning off the charging transistor (16) in the reverse polarity or short circuit condition, the apparatus (12) protects the charging transistor (16) and the voltage regulator arrangement (14) from an over current condition.
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patent: 3924158 (1975-12-01), Farnsworth
patent: 4884161 (1989-11-01), Atherton et al.
patent: 4899098 (1990-02-01), Gariboldi
patent: 4982149 (1991-01-01), Shimanuki
Culbertson Russell D.
Galvanix Corporation
Tso Edward
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