Power source switching circuit and power source switching system with power source switching circuit
US9166406B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 27, 2012 |
| Grant date | Oct 20, 2015 |
| Priority date | — |
| Expiry date | Mar 22, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02J9/068
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A power source switching circuit, includes a first and second contact, a first, second, and third relay. The first contact includes a first normally open main contact and a first normally closed auxiliary contact. The second contact includes a second normally open main contact and a second normally closed auxiliary contact. The first, second, third normally open contacts of the first, second, third relays, connected in series, are connected between three phrase lines of the main power source and the second normally closed auxiliary contact. The second normally closed auxiliary contact is connected to a zero line of the main power source. The first, second, third normally closed contacts, connected in parallel, are connected between three phrase lines of the auxiliary power source and the first normally closed auxiliary contact. The first normally closed auxiliary contact is connected to a zero line of the auxiliary power source.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.