Automatic paralleling of AC power sources
US4797570A · kind A · utility
9Cited by
12References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 31, 1987 |
| Grant date | Jan 10, 1989 |
| Priority date | — |
| Expiry date | Jul 31, 2007 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02J3/42
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A system for effecting parallel operation of a pair of AC power sources includes a monitoring circuit for monitoring the difference voltage occurring between output voltages on corresponding phases of the power sources. A capacitor is connected to a charging circuit and to an output of the monitoring circuit. When the difference voltage occurring between the output voltages on corresponding phases of the power sources exceeds a predetermined threshold level, the capacitor is shorted. Paralleling of the power sources is inhibited when the capacitor voltage is below a second predetermined threshold level.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.