Power device terminal backup switch unit
US12301051B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 15, 2024 |
| Grant date | May 13, 2025 |
| Priority date | — |
| Expiry date | Feb 15, 2044 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02J9/068
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
When a power outage occurs, an uninterruptable power supplies may lose all grid connections including a neutral connection which may be connected to ground. To avoid the loss of a ground connection to the power circuits of the UPS, a switch unit may be used to selectively connect a neutral conductor of the circuit to a ground terminal. The switch unit may comprise a power relay, a fast switch device (FSD), and a controller. The power relay and FSD may be connected in series between the neutral conductor of the circuit and a ground terminal. The controller may be configured to: close the FSD when the voltage between ground and neutral (Vng) goes above a first threshold, open the FSD when the voltage between any grid connection and neutral (Vg) goes above a second threshold, and close the FSD when Vg is below the second threshold.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.