Method and apparatus for variable phase induction heating and st

Electric heating – Metal heating – Of cylinders

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Details

219 1041, 373148, 373150, 363 96, 363135, H05B 608

Patent

active

052507777

ABSTRACT:
In one embodiment, an induction furnace is disclosed having a crucible, first and second set of induction coils surrounding the crucible and master and slave inverters, whereas in another embodiment, related to a channel-type induction furnace, the lower portion of the crucible houses at least first and second induction coils. The master and slave inverters each have a switching device with known turn-off-time characteristics for generating an alternating polarity output voltage across a load. The master inverter monitors the current, detects the zero-crossing of the current in the first induction coils, and generates a control signal in response to such detection of zero-crossing. The control signal is generated at an interval following the detection of the zero-crossing which is greater than the turn-off-time characteristic of the switching device. The control signal is introduced into a selectable delay line before it is applied to the slave inverter so as to produce a relative phase difference between the output voltages of the master and slaver inverter.

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patent: 5012487 (1991-04-01), Simcock

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