Dual-charging system for a portable electric appliance
US5459389A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 8, 1994 |
| Grant date | Oct 17, 1995 |
| Priority date | — |
| Expiry date | Jun 8, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02J2207/20
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A dual-charging system for a portable electric appliance such as a video camera comprises a rechargeable battery pack having a built-in charge circuit and a separate charger unit. The battery pack is capable of selectively taking a first charging operation with the use of the built-in charge circuit and a second charging operation with the use of a charge circuit of the charger unit. The charge circuit of the charger unit is designed such that a charging rate of the battery pack by the second charging operation is faster than that by the first charging operation. Therefore, when a rapid charging of the battery pack is desired, it is preferred to select the second charging operation. On the other hand, when the electric appliance is used, for example, during a journey, it is preferred to select the first charging operation because the charger unit is inconvenient to carry during a journey.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.