Battery backup circuit
US4670661A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 12, 1985 |
| Grant date | Jun 2, 1987 |
| Priority date | — |
| Expiry date | Jul 12, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02J9/06
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A battery backup circuit including n pieces of PC boards which are to be supplied with electric power from a main power source, switches to be turned on or off in response to the voltage of the main power source, a main backup battery for supplying each PC board with backup power when the main power source is cut off by the switch, and a backup battery having smaller capacity than the main backup battery provided on each of the PC boards and put in connection with the main backup battery with runaround preventing diodes interposed therebetween, so that each PC board may be independently supplied with backup power and provided with the even rate of electric power consumption, and that the battery backup circuit may be manufactured at low cost.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.