Charger for portable terminal equipment having on-hook/off-hook detecting means and battery identifying means
US5861729A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 3, 1993 |
| Grant date | Jan 19, 1999 |
| Priority date | — |
| Expiry date | Aug 3, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02J7/0036
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A charger for portable terminal equipment, capable of distinguishing a nickel-hydride battery pack and a nickel-cadmium battery pack and of detecting an on-hook/off-hook condition even when the nickel-hydride battery pack is used. The charger includes a charging circuit, a pair of third charging terminals connected to the charging circuit and adapted to be selectively connected to either a pair of first charging terminals of the nickel-hydride battery pack or a pair of second charging terminals of the nickel-cadmium battery pack, and a third auxiliary terminal adapted to be selectively connected to either a first auxiliary terminal of the nickel-hydride battery pack or a second auxiliary terminal of the nickel-cadmium battery pack. The charger further includes a device for comparing a voltage at the third auxiliary terminal with a first reference voltage and detecting the on-hook condition or the off-hook condition of the portable terminal equipment, and a device for comparing the voltage at the third auxiliary terminal with a second reference voltage lower than the first reference voltage and distinguishing the nickel-hydride battery pack and the nickel-cadmium battery pack.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.