Current feedback device for electric arc welder
US6268587A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 22, 2000 |
| Grant date | Jul 31, 2001 |
| Priority date | — |
| Expiry date | Feb 22, 2020 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB23K9/1043
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
In an electric arc welder including a main transformer with a primary stage coupled to a secondary stage in which is created an AC output current, a first switch opened and closed at a given rate to pass a series of first pulses of DC current in a first circuit having a first lead and through at least a portion of the primary stage in a first electrical direction, with each of the first pulses having a length determined by the time the first switch is closed, a second switch opened and closed at the given rate to pass a series of second pulses of DC current in a second circuit having a second lead through at a least a portion of the primary stage in a second electrical direction with each of the second pulses having a length determined by the time the second switch is closed, and a control circuit for rapidly closing the first and second switches in sequence to induce an AC current in the output stage, the improvement comprising: a first current transformer surrounding the first lead of the first circuit to develop a first output signal controlled by the first pulses, a second current transformer surrounding the second lead of the second circuit and developing a second output signa…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.