The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 24, 2015
Filed:
Dec. 20, 2010
Carsten Braun, Berlin, DE;
Ronald Stempel, Berlin, DE;
Harald Strohmaier, Falkensee, DE;
Siemens Aktiengesellschaft, Munich, DE;
Abstract
A drive circuit for an electromagnetic relay having a relay coil and switch contacts, includes a first switching device between a first coil terminal and a first voltage source, a second switching device between a second coil terminal and a zero potential, and a control device producing a current through the coil closing both switching devices. To provide the shortest possible response time and simple and cost-effective construction, a second voltage source is connected through a third switching device to the first coil terminal. The third switching device is connected in parallel with the first switching device, the second voltage source has a higher voltage level than the first voltage source and the control device produces a current through the coil, initially closing all three switching devices and following expiration of a predefined period, opening the third switching device again and keep the first and second switching devices closed.