Plasma pilot arc control
US5866869A · kind A · utility
44Cited by
6References
33Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 24, 1997 |
| Grant date | Feb 2, 1999 |
| Priority date | — |
| Expiry date | Feb 24, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05H1/36
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A method and apparatus for controlling and maintaining a continuous flow of pilot arc current in a plasma cutting torch includes a pilot circuit, a current sensing circuit, and a control circuit. The control circuit maintains a continuous flow of pilot current through the pilot circuit both before and after a cutting arc has been generated. The control circuit further controls the magnitude of the pilot current in response to the sensing circuit indicating the absence or presence of the cutting arc.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.