Indicating means in a double voltage motor vehicle electrical circuit
US5245267A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 8, 1992 |
| Grant date | Sep 14, 1993 |
| Priority date | — |
| Expiry date | Apr 8, 2012 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S320/13
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A double voltage alternator circuit having two alternators, each associated with one of two batteries connected in series, and two alternator excitation current control circuits each of which receives a d.c. voltage from an auxiliary rectifier bridge associated with the corresponding alternator, also has a single warning lamp connected between that terminal of a first one of the batteries which is not directly connected in series to the other battery and (a) the auxiliary rectifier bridge associated with that other battery, through an avalanche diode which enables current to pass through the lamp when the voltage at its terminals is greater than a predetermined value, and (b) to the auxiliary rectifier bridge associated with the first battery, through a uni-directional circuit element such as a diode which prevents current from flowing between the two auxiliary rectifier bridges. The invention enables fault indication in a double voltage circuit to be given using a single lamp.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.