Monitoring technique for accurately determining residual capacity of a battery
US6157169A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 23, 1998 |
| Grant date | Dec 5, 2000 |
| Priority date | — |
| Expiry date | Dec 23, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R31/374
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A battery monitoring system determines an accurate residual capacity of a battery in consideration of variation of battery temperature, amount of battery self-discharge, and amount of battery discharge from a host device, such as a portable computer. The monitoring system further determines a predicted remaining operating time of the device. The battery capacity measuring apparatus includes a microcontroller, a battery pack, a battery temperature detection circuit, a battery voltage detection circuit, a load current detection circuit, and a power saving level detector. The microcontroller is coupled to a host device such that it indicates the battery residual capacity along with the remaining operating time of the device via a display. The microcontroller calculates the residual capacity of the battery based on the detected battery voltage and a correction is made to the calculated residual capacity according to the battery temperature signal and the load current signal, the corrected resultant residual capacity being fed to the host device so as to display the residual capacity of the battery. Also, the microcontroller calculates the remaining operating time of the device based on…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.