Earth leakage power supply with bypass
US8928188B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 3, 2011 |
| Grant date | Jan 6, 2015 |
| Priority date | — |
| Expiry date | May 7, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02J3/00
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A power supply circuit for a remote load and a local controller includes a line connection receiving electrical power from an AC source. A load connection connects to the remote load. A switch is located between the line and load connections. Power is supplied to the load from the AC source through the switch. The switch is selectively opened and closed by the controller. A low voltage supply portion supplies power from the AC source to the controller. The low voltage supply portion includes an energy storage device for storing electrical energy for the controller. A current-limited earth ground portion conducts charging current from the energy storage device to earth and prevents charging current conducted to earth from exceeding a predetermined current level. An earth ground bypass portion conducts at least some of the charging current to the load when the switch located between the line and load is open.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.