Precision linear variable current control
US5357078A · kind A · utility
36Cited by
17References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 17, 1992 |
| Grant date | Oct 18, 1994 |
| Priority date | — |
| Expiry date | Dec 17, 2012 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB23K9/091
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A power supply for a consumable electrode arc welding system includes a power transformer adapted to be coupled to an AC source and having a rectified secondary coupled through a series inductor to the electrode. The rectified current is chopped by a MOSFET switch array controlled by a relatively high frequency pulse width modulator having a selectively variable pulse width to supply a pulsed unidirectional current flow to the welding gun. A bridge rectifier is connected across an auxiliary winding of the transformer to provide a supply voltage to the modulator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.