Discharge device for inductive devices
US7245471B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 29, 2003 |
| Grant date | Jul 17, 2007 |
| Priority date | — |
| Expiry date | Jul 18, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01T1/00
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for protecting an energized inductive device such as an electromagnet from an open circuit, i.e., the loss of the power source for the inductive device. A diode is connected across terminals of the inductive device such that when the inductive device is normally energized, the diode is reversed-biased. A spark gap enclosed in a housing is connected in series with the diode. An inert gas fills the housing. A resistance in the form of one or more resistors is in series with both the diode and the spark gap. Upon the sudden loss of supply to the energized device, the diode, the resistance and the spark gap form a path for the discharge of energy from the inductive device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.