Low voltage alternator having short circuit protection
US4570198A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 21, 1983 |
| Grant date | Feb 11, 1986 |
| Priority date | — |
| Expiry date | Jul 21, 2003 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02H7/065
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
In case of short circuit the overcurrent which passes through a detecting resistance in series with the excitation winding of the alternator operates a threshold current generator, which reduces the voltage of the central node of a voltage divider. A trigger interposed between said central node and an actuator circuit (for example a Darlington circuit) placed in series with the excitation winding of the alternator and with the above mentioned resistance turns off said actuator circuit, thus interrupting the current passage through the excitation winding. A filtering condenser associated to the voltage divider restores with delay the initial condition. The cycle is periodically repeated until the short circuit condition remains.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.