Electric heating – Metal heating – Of cylinders
Patent
1992-09-10
1993-10-05
Leung, Philp H.
Electric heating
Metal heating
Of cylinders
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.
REFERENCES:
patent: 1943802 (1934-01-01), Northrup
patent: 3314670 (1967-04-01), Kennedy
patent: 3414659 (1968-12-01), Kennedy
patent: 3419792 (1968-12-01), Kasper et al.
patent: 3472941 (1969-10-01), Floymayr
patent: 3478156 (1969-11-01), Segsworth
patent: 3536983 (1970-10-01), Kennedy
patent: 3731183 (1973-05-01), Johnson et al.
patent: 3851090 (1974-11-01), Folgero et al.
patent: 3913005 (1975-10-01), Cook
patent: 4238637 (1980-12-01), Bingen et al.
patent: 5012487 (1991-04-01), Simcock
Inductotherm Corp.
Leung Philp H.
LandOfFree
Method and apparatus for variable phase induction heating and st does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for variable phase induction heating and st, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for variable phase induction heating and st will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1006212