Electricity: battery or capacitor charging or discharging – Serially connected batteries or cells – With discharge of cells or batteries
Patent
1992-11-17
1994-08-16
Peckman, Kristine L.
Electricity: battery or capacitor charging or discharging
Serially connected batteries or cells
With discharge of cells or batteries
320 32, 320 39, H02J 704
Patent
active
053390180
ABSTRACT:
An apparatus for monitoring voltage as a function of temperature of a storage battery and an apparatus for controlling the charging voltage of the battery based on battery temperature, voltage, and charging system loads. The battery monitoring apparatus includes a comparator for comparing, at any temperature in the working temperature range of the battery, the actual battery voltage with a reference battery voltage. The reference battery voltage is the voltage gassing curve for the storage battery. The comparator is given a temperature coefficient provided by a temperature-sensitive band-gap voltage reference. A plurality of the temperature-sensitive band-gap reference cells may be connected together in order to accurately track any differently sloped battery gassing voltage curve. An apparatus for controlling charging voltage of the storage battery is also provided, which includes a comparator for comparing, at any temperature in a predetermined range, the actual charging voltage with a reference charging voltage. The reference charging voltage curve is a function of charging system component temperatures and electrical system loads. A plurality of comparators may be connected together in order to approximate any desired charging voltage reference curve or combination of curves.
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Horowitz and Hill, The Art of Electronics, 1980, pp. 192-195.
Analog Devices Inc.
Peckman Kristine L.
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