Electric heating – Metal heating – By arc
Patent
1999-12-16
2000-09-19
Paschall, Mark
Electric heating
Metal heating
By arc
21912157, 2191215, 219 75, 21912148, B23K 900
Patent
active
061215716
ABSTRACT:
The present invention relates to ignition circuitry for a plasma generator. A discharge is created by application of a high frequency or high voltage dc ignition pulse between an electrode and a first nozzle. Following ignition, the discharge is redirected to a second nozzle for the purpose of moving the plasma flow from the ignition zone into the zone of application to the workpiece. The present invention is directed to plasma ignition circuitry for improving this performance. Positive thermal coefficient ("PTC") resistance is shown to be useful in reliably and reproducibly switching the arc. Alternative embodiments of the present invention relate to switching the plasma from a first nozzle to a second nozzle then sequentially to additional nozzles downstream in the flow of plasma gas in which PTC resistance is used to reliably and reproducibly effect the switching. Yet other embodiments of the present invention relate to the generation of two plasma jets directed so as to intersect, and switching current flow from the plasma-igniting nozzle electrodes to a direct flow of current from one electrode through the two plasma jets to the second electrode.
REFERENCES:
patent: 3594609 (1971-07-01), Vas et al.
patent: 3639831 (1972-02-01), Cushman
patent: 3743781 (1973-07-01), Holden
patent: 3798408 (1974-03-01), Foex et al.
patent: 3818174 (1974-06-01), Camacho
patent: 3828162 (1974-08-01), Holden
patent: 3980467 (1976-09-01), Camacho et al.
patent: 4382099 (1983-05-01), Legge et al.
patent: 4420346 (1983-12-01), Belkin et al.
patent: 4517495 (1985-05-01), Piepmeier
patent: 4959520 (1990-09-01), Okada et al.
patent: 5041713 (1991-08-01), Weidman
patent: 5506384 (1996-04-01), Yamaguchi
patent: 5560779 (1996-10-01), Knowles et al.
patent: 5562841 (1996-10-01), Kulik et al.
patent: 5609777 (1997-03-01), Apunevich et al.
patent: 5719370 (1998-02-01), Appunevich et al.
patent: 5782952 (1998-07-01), Diaz et al.
patent: 5895558 (1999-04-01), Spence
Halahan Patrick
Siniaguine Oleg
Paschall Mark
Wolken, Jr. George
LandOfFree
Plasma generator ignition circuit does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Plasma generator ignition circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Plasma generator ignition circuit will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1075458