System and method for double fault protection within a digital camera device
US5949160A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 8, 1996 |
| Grant date | Sep 7, 1999 |
| Priority date | — |
| Expiry date | Oct 8, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01R2103/00
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The invention comprises a battery coupled to a power bus, an external power connector coupled to the power bus for receiving an external power plug, and two switching devices for disconnecting the battery from the power bus when the external power plug is coupled to the connector. The battery supplies power to the camera unless the external power plug is coupled to the connector. Upon coupling of the external power plug to the connector, the two switching devices, which are positioned in series between the negative terminal of the battery and the system ground, are opened. The opening of the two switching devices disconnects the battery from the power bus and connector to prevent damage which could be caused by applying an externally supplied voltage from the external power plug across the positive and negative terminals of the battery.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.