Differential current detection
US7224559B2 · kind B2 · utility
3Cited by
6References
21Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 21, 2004 |
| Grant date | May 29, 2007 |
| Priority date | — |
| Expiry date | Jan 20, 2025 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60L3/0069
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A detection circuit detects a difference between a source current and a return current. The detection circuit includes a constantly biased magnetic core through which conductors of the source and return currents extend, and a sense winding around the core. The sense winding carries an AC signal. A sensing circuit connected with the sense winding senses a change in small signal impedance of the sense winding relative to the core. This detection circuit can be used to protect people and equipment against accidental contact with high-voltage DC systems.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.