Power reduction circuit for engine acceleration
US6121691A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 26, 1999 |
| Grant date | Sep 19, 2000 |
| Priority date | — |
| Expiry date | Feb 26, 2019 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB23K9/1043
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A method and apparatus for providing welding power from an engine/generator driven welding power supply includes an engine and a generator. A welding power supply is connected to the generator output, and provides welding power. A controller controls the apparatus, and receives an RPM input signal indicative of the engine RPM, and a user selected magnitude input. The controller includes an output reduction circuit that reduces the magnitude of the welding power by a variable amount in the event the engine is likely to stall, so as to reduce the likelihood of a stall, but maintain sufficient power for a welding arc. The magnitude of the welding power is reduced by an amount responsive to the engine speed in the event that the engine RPM is less than an RPM threshold, and/or by an amount responsive to the user selectable setting in the event that the user selectable setting is greater than a threshold. The power reduction may be responsive and/or proportional to the difference between the actual value and the threshold, and continuous or done in steps. The output reduction circuit controls the generator field current or the load current command to reduce the welding power.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.