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1. (WO2018039330) VARIABLE SPEED ENGINE DRIVEN GENERATOR WITH ENERGY STORAGE DEVICE FOR PROVIDING WELDING AND AUXILIARY POWER

Pub. No.:    WO/2018/039330    International Application No.:    PCT/US2017/048194
Publication Date: Fri Mar 02 00:59:59 CET 2018 International Filing Date: Thu Aug 24 01:59:59 CEST 2017
IPC: B23K 9/10
Applicants: ILLINOIS TOOL WORKS INC.
Inventors: BATZLER, Todd
Title: VARIABLE SPEED ENGINE DRIVEN GENERATOR WITH ENERGY STORAGE DEVICE FOR PROVIDING WELDING AND AUXILIARY POWER
Abstract:
A method and apparatus for providing welding-type power derives motive power from a variable speed engine and driving a variable frequency generator with the motive power to provide a generator output. The generator output is preregulated to provide an intermediate signal, and the preregulating is controlled at least in response to feedback indicative of the welding-type output power. Welding-type output power is derived from the bus, and controlled at least in response to the welding feedback. Auxiliary output power is also derived from the bus, and controlled at least in response to feedback indicative of the auxiliary output power. The speed of the engine is controlled at least in response to one of the auxiliary feedback and the welding feedback. Energy produced by the engine that is not used as an output is stored by batteries. When the output exceeds the energy generated, the difference is supplied by the batteries.