Chemistry: electrical current producing apparatus – product – and – Process of cell operation
Patent
1992-07-08
1994-02-08
Kalafut, Stephen
Chemistry: electrical current producing apparatus, product, and
Process of cell operation
429 93, 324427, H01M 1048
Patent
active
052847195
ABSTRACT:
A battery detect circuit (32) is connected to the battery with the current input to the battery and extracted from the battery measured with a sense resistor (50) and then converted to charge and discharge pulses with a V/F converter (52). A microcontroller (64) is operable to increment a Nominal Available Charge (NAC) register (180) during a charge operation, and to increment a Discharge Count Register (DCR) (184) during a discharge operation. The NAC register (180) indicates the available charge, which value is output to a display (34). The maximum value to which the NAC value can rise is limited by a value stored in the last measured discharge register (182). This value represents the value stored in the DCR (184) whenever the battery is discharged from an apparent full state to a fully discharged state. This results in a qualified transfer to the LMD register (182) such that no knowledge of the actual battery charge is necessary.
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Freeman David L.
Landau John E.
Matthews Wallace E.
Benchmarq Microelectronics, Inc.
Kalafut Stephen
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