Automatic bus transfer device for single phase and multiphase power systems, providing infinite isolation
US5939802A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 22, 1997 |
| Grant date | Aug 17, 1999 |
| Priority date | — |
| Expiry date | Dec 22, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02J1/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An automatic bus transfer device is provided for single phase and multiphase power systems. The automatic bus transfer device provides infinite isolation and automatic switching from a primary power bus to a secondary power bus when the power (or voltage) being provided by the primary power bus falls below a predetermined level. The automatic bus transfer device includes a relay and a signal detector. The relay includes a master portion and a slave portion. The slave portion has a first input terminal, a second input terminal and an output terminal. The slave portion is switchable from a primary state to a secondary state and vice versa in a manner responsive to the master portion. The output terminal of the slave portion is electrically connected to a primary one of the input terminals when the slave portion is in the primary state and is electrically connected to a secondary one of the input terminals when the slave portion is in the secondary state. When the primary one of the input terminals carries a signal above a predetermined level, the master portion drives the slave portion into the primary state. Similarly, when the primary one of the input terminals of the relay carries…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.