Current supply device for electrically heating a molten medium

US4410998A · kind A · utility

Assignee

• Licentia Patent-Verwaltungs-GmbH · DE

Inventors

• Fritz Germann, deceased · Lübz, DE
• Eduard Kuntz · Arnsberg, DE
• Reinhold Müller · Baiersdorf, DE
• Horst Scholz · Warstein, DE

Key dates

• Filing date: May 20, 1981
• Grant date: Oct 18, 1983
• Expiry date: May 20, 2001

Classification

• Technology area (CPC H): Electricity
• CPC primary: H05B3/0023
• WIPO field: Electrical machinery, apparatus, energy
• WIPO sector: Electrical engineering

Abstract

A system for generating in-phase alternating current components which are fed into a medium held in a melting trough and flow in the medium between electrodes and counterelectrodes immersed in the medium to effect resistance heating. One embodiment of the system includes a supply voltage source, and a plurality of transformers each having a primary winding and a secondary winding, with the primary windings being connected together in series and to the source, each secondary winding being connected between a respective electrode and counterelectrode to provide a respective alternating current component, and each winding having a number of turns corresponding to the desired relative amplitudes of the current components. A second embodiment of the system includes a supply voltage source, at least one input transformer having a primary winding connected to the source and at least one secondary winding, and a plurality of additional transformers each having a primary winding and a secondary winding, with the primary windings of the additional transformers being connected together in series and in a closed loop, each secondary winding of the input transformer being connected in series wi…