Power supply circuit for an automobile
US5191500A · kind A · utility
11Cited by
3References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 11, 1990 |
| Grant date | Mar 2, 1993 |
| Priority date | — |
| Expiry date | Sep 11, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02J2310/46
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A power supply circuit for an automobile including an electric automotive appliance having a memory, a main battery, a backup battery, an ignition key switch, a battery switching circuit for connecting one of the main and backup batteries to the electric automotive appliance, a power detector for detecting a charged power in the backup battery, a limiting circuit for limiting the operation of the electric automobile appliance to only a power backup of the memory, and a control circuit for activating the limiting circuit when a charged power in the backup battery is detected to be below a predetermined level.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.