| 摘要 |
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.
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