Current supply device for electrically heating a molten medium

Details Current supply device for electrically heating a molten medium Current supply device for electrically heating a molten medium

1981-05-20

1983-10-18

Envall, Jr., Roy N.

Industrial electric heating furnaces

Glass furnace device

Joule effect heating

C03B 5027

Patent

active

044109989

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 with at least one secondary winding of the additional transformers between a respective electrode and counterelectrode to provide a respective alternating current component, and each winding of the additional transformers having a number of turns corresponding to the desired relative amplitudes of the current components.

REFERENCES:
patent: 3182112 (1965-05-01), Torok
patent: 4049899 (1977-09-01), Shimizu et al.

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