Control circuit for switching power to an induction furnace

Details Control circuit for switching power to an induction furnace Control circuit for switching power to an induction furnace

1988-03-10

1989-03-07

Envall, Jr., Roy N.

Industrial electric heating furnaces

Induction furnace device

Power supply system

373150, H05B 102, H05B 504

Patent

active

048113565

ABSTRACT:
A control circuit particularly useful for controlling the application of power to a single phase induction furnace from a normal line frequency power supply is provided. The load has a large inductance and a resistance. A switch, preferably formed from thyristors, is provided in series connection with the furnace load. A first capacitor is provided in parallel connection with the series connected switch and load. A second capacitor is provided in series connection with the series connected switch and load and the first capacitor whereby selective operation of conduction of the switch results in the smooth and continuous control of furnace power. In an alternative embodiment small inductors are placed in series with the capacitors to provide a filter preferably tuned to the fourth harmonic of the power supply.

REFERENCES:
patent: 3478155 (1969-11-01), Segsworth
patent: 4037044 (1977-07-01), Havas

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