US 11,980,977 B2
Systems, methods, and apparatus to control weld current in a preheating system
Quinn William Schartner, Kaukauna, WI (US); and James Lee Uecker, Appleton, WI (US)
Assigned to Illinois Tool Works Inc., Glenview, IL (US)
Filed by Illinois Tool Works Inc., Glenview, IL (US)
Filed on Nov. 10, 2022, as Appl. No. 17/984,671.
Application 17/984,671 is a continuation of application No. 16/003,387, filed on Jun. 8, 2018, granted, now 11,524,354.
Claims priority of provisional application 62/517,505, filed on Jun. 9, 2017.
Prior Publication US 2023/0075751 A1, Mar. 9, 2023
Int. Cl. B23K 9/10 (2006.01); B23K 9/32 (2006.01)
CPC B23K 9/1093 (2013.01) [B23K 9/1006 (2013.01); B23K 9/1043 (2013.01); B23K 9/32 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A preheating power supply, comprising:
power conversion circuitry configured to output welding-type power via a positive output power connector and a negative output power connector; and
a bypass path prevention circuit between the power conversion circuitry and the positive output power connector or between the power conversion circuitry and the negative output power connector, and configured to:
prevent less than a threshold voltage applied to the positive output power connector and the negative output power connector from a different power supply from causing current to flow in a first direction between the positive output power connector and the negative output power connector; and
permit conduction of current in the first direction from the positive output power connector to the negative output power connector through the bypass path prevention circuit when more than the threshold voltage is applied between the positive output power connector and the negative output power connector by the power conversion circuitry.