Apparatus and method for coulometric metering of battery state o

Details Apparatus and method for coulometric metering of battery state o Apparatus and method for coulometric metering of battery state o

1998-12-10

1999-12-07

Tso, Edward H.

Electricity: battery or capacitor charging or discharging

Battery or cell discharging

With charging

320DIG21, 324428, H01M 1046, H01M 1044

Patent

active

059989718

ABSTRACT:
The apparatus for metering the state of charge of a battery has a battery current sensor providing a voltage signal dependent on a current flowing into or out of the battery, an integrator for integrating the voltage signal, a window detector circuit providing an output signal each time an output of the integrator reaches an upper or lower threshold voltage level, a digital processing device utilizing the output signals of the window detector circuit to construct a digital battery charge state model, and a switch arrangement for reversing connection of the battery current sensor to the integrator periodically so as to cancel effect of any voltage offset in the output of the integrator.

REFERENCES:
patent: 4499424 (1985-02-01), Rowlette

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