Patent · US Active

Electronic circuit and method of supplying electricity

US8665924B2 · kind B2 · utility

1Cited by

3References

7Claims

0Family size

Assignee

SMS SIEMAG AG · DE

Inventors

Roland Koenig · Habach, DE
Thomas Pasch · Erkrath, DE
Andreas Haaks · Rheinberg, DE
Rolf Degel · Ratingen, DE

Key dates

Filing date	Jul 24, 2006
Grant date	Mar 4, 2014
Priority date	—
Expiry date	Jul 29, 2029

Classification

Technology area (CPC H)Electricity
CPC primaryH05B7/005
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

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 (1) and a AC power controller (8) connected between the transformer (6) and the electrode (11) for regulating the current through the electrode (11). 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 (8) 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 (9) that is opened or closed with the help of a controller as a function of the amount of current flowing through the electrode (11).

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