Charge status indicator
US5633592A · kind A · utility
28Cited by
9References
10Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 6, 1995 |
| Grant date | May 27, 1997 |
| Priority date | — |
| Expiry date | Jun 6, 2015 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S320/21
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A circuit arrangement for indicating the charge status of a batter in an electrical appliance includes a voltage comparator with hysteresis which detects the battery voltage, an oscillator driven by the voltage comparator, and an indicating device. The oscillator oscillates when the voltage is above a first threshold voltage and switches the indicating device to an active condition. The oscillator is blocked when the voltage is below a second threshold voltage and switches the indicated device to a passive condition.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.