US 12,263,545 B2
Welding-type power supplies with adjustable AC current commutation thresholds
Mark S. Kadlec, Shiocton, WI (US); and Andrew Joseph Henry, Appleton, WI (US)
Assigned to Illinois Tool Works Inc., Glenview, IL (US)
Filed by Illinois Tool Works Inc., Glenview, IL (US)
Filed on Aug. 7, 2017, as Appl. No. 15/670,168.
Claims priority of provisional application 62/375,830, filed on Aug. 16, 2016.
Prior Publication US 2018/0050412 A1, Feb. 22, 2018
Int. Cl. B23K 9/10 (2006.01); B23K 9/067 (2006.01); B23K 9/073 (2006.01); B23K 9/09 (2006.01); B23K 9/095 (2006.01)
CPC B23K 9/1043 (2013.01) [B23K 9/067 (2013.01); B23K 9/0731 (2013.01); B23K 9/092 (2013.01); B23K 9/0953 (2013.01); B23K 9/0956 (2013.01); B23K 9/1006 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A welding-type power supply, comprising:
an interface device configured to receive a commutation current threshold selection input;
a power converter configured to convert input power to welding-type power;
a commutator circuit configured to output alternating current (AC) welding-type power and to control a polarity of the AC welding-type power; and
a control circuit configured to:
set a commutation current threshold based on the commutation current threshold selection input, wherein the commutation current threshold selection input comprises a selection of a percentage of a peak current amplitude, and the control circuit is configured to determine the commutation current threshold based on multiplying the commutation current threshold selection input by a positive peak current setpoint or a negative peak current setpoint;
determine an output current of the AC welding-type power and the polarity of the AC welding-type power; and
when the output current traverses the commutation current threshold, control the commutator circuit to change the polarity of the AC welding-type power.