Measuring counter of the state of charge of the powering battery of an electronic appliance
US6339315B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 14, 2000 |
| Grant date | Jan 15, 2002 |
| Priority date | — |
| Expiry date | Feb 14, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R31/382
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A charge counter for monitoring the charge of the battery state of an electronic device includes a sensing circuit of the charge and discharge current of the battery. The sensing circuit includes a differential amplifier having inputs coupled to the terminals of a sensing resistor of the battery current, a resettable integrator of the output signal of the amplifier, a first comparator and a second comparator of the output signal of the integrator generating a logic charge interrupt signal and a logic discharge interrupt signal, respectively. The sensing circuit also includes a switch for discharging the capacitance of the integrator momentarily closed by a logic circuit at every transition of the output signal of one or the other of the first and second comparators. Further, the sensing circuit includes a processor for the interrupts which monitors the state of charge of the battery, a timer for measuring the time elapsing from the start of a new integration ramp and the switching instant of either one of the first and second comparators, and a nonvolatile memory register containing the measure of the time interval of integration of the offset of the differential amplifier up to th…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.