Method and apparatus for expanded battery recognition in a batte

Details Method and apparatus for expanded battery recognition in a batte Method and apparatus for expanded battery recognition in a batte

1997-03-07

1997-12-09

Wong, Peter S.

Electricity: battery or capacitor charging or discharging

Serially connected batteries or cells

With discharge of cells or batteries

320 2, 320 35, 429 90, H01M 1046, H01M 1048

Patent

active

056964331

ABSTRACT:
A battery charging system (200) provides an expanded range of battery recognition. Battery (204) includes two zener diodes (224, 226) coupled in a cathode-to-cathode configuration between the battery's capacity resistor 220 and the battery's thermistor 222. The charger 202 biases the first zener diode (224) while latching the second zener diode (226) such that the value of the latched zener diode can be determined by the A/D ports (234, 236) of the charger (202). The charger (202) then biases the second zener diode (226) and latches the first zener diode (224) so that the value of the first latched zener diode (224) can be determined through A/D ports (234, 236) of the charger. The thermistor (222) and capacity resistor (220) are read by the A/D ports (234, 236) when neither of the diodes (224, 226) is biased. Hence, the charging system (200) provides four battery ID parameters with which to identify the battery.

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