Patent · US Expired

Method and apparatus for reducing the switching noise of an electromagnetic switching device

US7116541B2 · kind B2 · utility

2Cited by

4References

20Claims

0Family size

Assignee

Siemens Aktiengesellschaft · DE

Inventors

Dirk Hertz · Fichtenhof, DE
Bernhard Streich · Amberg, DE

Key dates

Filing date	Nov 8, 2002
Grant date	Oct 3, 2006
Priority date	—
Expiry date	Jul 4, 2023

Classification

Technology area (CPC H)Electricity
CPC primaryH01F2007/1894
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

In order to achieve a reduction in the switching noise during operation of an electromagnetic switching device with little complexity, a coil for moving an armature with moving switching contacts is driven in order to make contact at a first minimum value of a supply voltage. The supply voltage is then increased from the first minimum value to a second minimum value as a function of time, such that the moving switching contacts can be moved with the stationary switching contacts into sufficient mutual contact with pressure applied.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.