Battery pack charger having a fail-safe heat-sensitive switch for preventing overcharge
US5900719A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 27, 1998 |
| Grant date | May 4, 1999 |
| Priority date | — |
| Expiry date | Feb 27, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02J7/00309
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A battery pack charger has an external frame provided with an insertion slot for inserting a battery pack. A charging terminal and a charging control circuit are housed in the external frame. A heat-sensitive switch is provided between the charging terminal and the charging control circuit. A lead wire is provided between the charging terminal and the heat-sensitive switch. The lead wire has a length appropriate for not losing the effect of heat transferred along the lead wire. The battery pack charger is capable of reliably charging a battery pack without the occurrence of overcharge, even if the battery pack is not provided with a heat-sensitive switch.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.