Operation circuit and power switching device employing the operation circuit
US6882515B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 26, 2003 |
| Grant date | Apr 19, 2005 |
| Priority date | — |
| Expiry date | Nov 26, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H33/6662
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
In an operation circuit of an electromagnetic switching device, when electric energy is discharged by discharge switches connected in series, respectively, to opening coils and closing coils, an induction current flowing in a direction opposite to a current of the coil of the excitation side is generated. The current flows through the coil on the non-excitation side due to magnetic coupling, and a magnetic flux necessary for driving is cancelled, thereby inhibiting generation of a driving force. The operation circuit includes first and second opening and closing coils, so that a moving element may be driven between those coils. This circuit includes a circuit for suppressing an over-voltage at the moment of interrupting an excitation current of a first coil and for interrupting an induction current generated through the first coil at the time of exciting the second coil.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.