Battery charging circuit for an emergency system
US4223232A · kind A · utility
28Cited by
9References
10Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 31, 1978 |
| Grant date | Sep 16, 1980 |
| Priority date | — |
| Expiry date | May 31, 1998 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02J9/02
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A single active element performs the multiple functions of regulating DC voltage level from an AC source supplied to charge a battery and of coupling the battery to power an emergency system such as an emergency lighting system upon loss of the AC source. Preferably, the single active element also performs a third function of disconnecting the battery from the emergency system in time to prevent over discharge and consequent permanent damage to the battery.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.