Title:
WELDING-TYPE POWER SUPPLIES WITH ADJUSTABLE AC CURRENT COMMUTATION THRESHOLDS
Document Type and Number:
WIPO Patent Application WO/2018/034890
Kind Code:
A3
Abstract:
Welding-type power supplies with adjustable AC current commutation thresholds are disclosed. An example welding-type power supply includes an interface device to receive a commutation selection input, a power converter to convert input power to welding-type power, a commutator circuit to output alternating current (AC) welding-type power and to control a polarity of the AC welding-type power, and a control circuit. The control circuit determines a threshold output current (204, 206) based on the commutation selection input, determines an output current and a polarity of the AC welding-type power and, when the output current is less than the threshold output current (204, 206), controls the commutator circuit to change the polarity of the AC welding-type power.
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Inventors:
KADLEC MARK S (US)
HENRY ANDREW JOSEPH (US)
HENRY ANDREW JOSEPH (US)
Application Number:
PCT/US2017/045920
Publication Date:
May 11, 2018
Filing Date:
August 08, 2017
Export Citation:
Assignee:
ILLINOIS TOOL WORKS (US)
International Classes:
B23K9/073; B23K9/10; B23K9/095
Domestic Patent References:
| WO2011114679A1 | 2011-09-22 |
Foreign References:
| EP0538227A1 | 1993-04-21 | |||
| US6111216A | 2000-08-29 | |||
| SU563241A1 | 1977-06-30 | |||
| US20130068744A1 | 2013-03-21 | |||
| EP1193019A2 | 2002-04-03 |
Attorney, Agent or Firm:
PAHNKE, Chad A. (US)
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