| 摘要 |
A method and a circuit to monitor exactly the charge status of a battery of a battery powered device is achieved. The charge and discharge currents are continuously measured and integrated over time to get the exact charge of the battery. Inaccuracies caused by the offset of the integrators are precisely compensated by a bridge-like design of said circuit and by a feedback of said offset to the input of the integrators. The system is clocked in a way to enable a continuous operation. Another advantage is the low current consumption of the circuit by sharing some of the components for the integration of the currents and handling of the offset. The improved accuracy is optimizing the operation of said battery driven device and is avoiding any potential damage of the battery.
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