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. 04, 2014
Filed:
Jul. 24, 2006
Roland Koenig, Duisburg, DE;
Thomas Pasch, Erkrath, DE;
Andreas Haaks, Rheinberg, DE;
Rolf Degel, Im Laar, DE;
Roland Koenig, Duisburg, DE;
Thomas Pasch, Erkrath, DE;
Andreas Haaks, Rheinberg, DE;
Rolf Degel, Im Laar, DE;
SMS Siemag Aktiengesellschaft, Duesseldorf, DE;
Abstract
The invention relates to an electronic circuit and a method for feeding power to at least one electrode of an alternating-current electric-arc furnace, particularly for melting metal. Known circuits of this type typically comprise a series connection with a transformer for providing a supply voltage for the electric-arc furnace from a power grid () and a AC power controller () connected between the transformer () and the electrode () for regulating the current through the electrode (). According to the invention, a further development for such electronic circuits is proposed, which development has a simple design, is inexpensive and prevents overload of the AC power controller () even in operating modes of the electric-arc furnaces at high electrode currents. This further development provides to bypass the AC power controller with a bypass switch () that is opened or closed with the help of a controller as a function of the amount of current flowing through the electrode ().