Apparatus for expanding battery recognition in a battery chargin

Details Apparatus for expanding battery recognition in a battery chargin Apparatus for expanding battery recognition in a battery chargin

1996-10-04

1997-12-30

Wong, Peter S.

Electricity: battery or capacitor charging or discharging

Means to identify cell or battery type

320153, H02J 710

Patent

active

057034672

ABSTRACT:
A battery charging system (300) provides an expanded range of battery recognition between a charger (302) and a battery (304). Two resistors (316, 318) are coupled in series across the positive and negative charging terminals (B+, B-) of the battery (304) such that when the battery is coupled to the charger (302) there is provided a voltage divider to an A/D port (332) which is used to determine the battery type. Initially, the charger (302) disables charge current to the battery (304) and the charger determines the first resistor (316) value by enabling a switching circuit (336) and reading A/D port (332). Current is then enabled through positive charge node (B+) with the switching circuit (336) switched off, and the value of second resistor (318) is determined. The two resistors (316, 318) provide for an expanded range within which the A/D port (332) can determine battery type. A second charging system (400) provides an expanded battery type recognition range in a three contact charging system.

REFERENCES:
patent: 5166623 (1992-11-01), Ganio
patent: 5184059 (1993-02-01), Patino et al.
patent: 5371453 (1994-12-01), Fernandez
patent: 5411816 (1995-05-01), Patino
patent: 5471128 (1995-11-01), Patino et al.
patent: 5576610 (1996-11-01), Patino et al.
patent: 5606241 (1997-02-01), Patino et al.

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