Electricity: battery or capacitor charging or discharging – Serially connected batteries or cells – With discharge of cells or batteries
Patent
1993-03-18
1995-06-06
Stephan, Steven L.
Electricity: battery or capacitor charging or discharging
Serially connected batteries or cells
With discharge of cells or batteries
H02K 704
Patent
active
054225604
ABSTRACT:
A battery charger including a battery detector at a node at which a battery is connectable. When a battery is not present, a voltage at the node fluctuates, but when a battery is present, the battery holds the voltage substantially constant. A level shifter shifts the voltage at the node. If no battery is present, the shifted voltage will fall below a predetermined threshold, but if a battery is present, the shifted voltage will remain above the predetermined threshold. A ground sense comparator detects whether or not the shifted voltage is below the predetermined threshold, and provides a battery detection signal accordingly. A controllable charge driver couples power from a power supply through to a battery, to charge the battery. An integrated circuit provides logic functions of the apparatus, including logic functioning as a charge controller. The charge controller is responsive to the battery detection signal to provide a charge drive signal to turn on the controllable charge driver only if a battery is present. The battery charger is capable of fast charging a wide variety of batteries according to a user-selectable charge rate.
REFERENCES:
patent: 4577144 (1986-03-01), Hodgman et al.
patent: 4584514 (1986-04-01), Kaminski
patent: 4602204 (1986-07-01), Hase
patent: 4629965 (1986-12-01), Fallon et al.
patent: 4670703 (1987-06-01), Williams
patent: 4746852 (1988-05-01), Martin
patent: 5013992 (1991-05-01), Eavenson et al.
Stephan Steven L.
TelCom Semiconductor, Inc.
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