Portable information apparatus for sensing battery voltage drop
US5187441A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 11, 1990 |
| Grant date | Feb 16, 1993 |
| Priority date | — |
| Expiry date | Dec 11, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R31/3648
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The portable information apparatus has a battery, a boosting circuit for boosting a voltage of the battery, a battery voltage detector for detecting a voltage level of the battery, an oscillating circuit for generating CPU clock and a counting circuit for counting the interval from the start of the oscillation of the CPU clock to the time when it becomes stable. The apparatus negates the output of the battery voltage detector during the interval counted by the counting circuit so that it can prevent the monitoring of the battery voltage lowering in the time of usual performance from influencing of the battery potential drop due to the transient current at the start of the performance of the boosting circuit and the oscillating circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.