Patent · US Expired

Method of determining and displaying battery charge status

US5973497A · kind A · utility

78Cited by

5References

14Claims

0Family size

Assignee

The Braun Corporation · DE

Inventors

Gunther Bergk · Niedernhausen, DE
Jochen Cimbal · Friedberg, DE

Key dates

Filing date	Apr 14, 1997
Grant date	Oct 26, 1999
Priority date	—
Expiry date	Apr 14, 2017

Classification

Technology area (CPC G)Physics
CPC primaryG01R31/3835
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

A method of determining and displaying the charge status of a storage battery of a battery-operated appliance, such as a razor. A time-based charge status is calculated, based at least in part on the cumulative operating time of the appliance since recharging. The battery terminal voltage is also monitored. The time-based charge status is displayed until the battery voltage indicates a low voltage condition, at which point a low-charge alert indicator is displayed only if the time-based charge status is below a predetermined level (i.e., if the cumulative operating time is above a predetermined level). Methods of detecting battery aging, and for accounting for periods of excessive current flow, are included.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.