Method and apparatus for eliminating D.C. in an electric glass m

Details Method and apparatus for eliminating D.C. in an electric glass m Method and apparatus for eliminating D.C. in an electric glass m

1978-05-15

1980-10-07

Pellinen, A. D.

Electricity: power supply or regulation systems

Remote sensing

323 18, 323 20, 323 24, C03B 502, G05F 144

Patent

active

042270294

ABSTRACT:
A method and apparatus for controlling the supply of alternating electrical power to the electrodes of an electrical glass melting furnace in a manner eliminating or significantly minimizing any d.c. component. Reverse-poled controlled rectifiers are connected between an a.c. source and the electrodes to provide successive periods of alternating electricity to the electrodes, and the firing or gating of the rectifiers is controlled by a circuit in a manner causing each succeeding period of alternating electricity supplied to the electrodes to begin with a polarity opposite that of the alternating electricity supplied during the immediately preceding period. Any d.c. component will be cancelled to zero when averaged over two adjacent periods.

REFERENCES:
patent: 3290605 (1966-12-01), Humphrey
patent: 3546567 (1970-12-01), Shimp
patent: 3836689 (1974-09-01), Holler et al.
patent: 3937921 (1976-02-01), Furuichi et al.
patent: 3961236 (1976-06-01), Rodek et al.

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