Method and circuit for optical and/or acoustic indication of the charge state of a battery or a storage battery
US4567476A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 30, 1983 |
| Grant date | Jan 28, 1986 |
| Priority date | — |
| Expiry date | Dec 30, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R31/3646
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The subject of the invention is a circuit for monitoring the charge state of a battery for supplying voltage to an electrical consumer through a mode selector switch which may be switched from an OFF-state for disconnecting the electrical consumer from the battery into an ON-state for connecting the electrical consumer with said battery whereby in said ON-state different modes of operation of said electrical consumer are possible. The charge state of the battery is determined when the mode selector switch is in the ON-state and, when the voltage drops below an adjustable threshold value, an acoustic and/or optical indication is triggered after the electrical consumer is switched off. The circuit in the ON-state consumes only a very slight amount of energy and no additional energy in the OFF-state. In addition to the mode selector switch for switching the electrical consumer on and off, no battery test button or additional battery test position of the mode selector switch is required.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.