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1. (WO2014209496) METAL WORKING POWER SUPPLY CONVERTER SYSTEM AND METHOD

Pub. No.:    WO/2014/209496    International Application No.:    PCT/US2014/036303
Publication Date: Thu Jan 01 00:59:59 CET 2015 International Filing Date: Fri May 02 01:59:59 CEST 2014
IPC: B23K 9/09
B23K 9/10
H02M 3/28
Applicants: ILLINOIS TOOL WORKS INC.
Inventors: MANTHE, Alan A.
DUNAHOO, Jason Alan
KNOENER, Craig Steven
POULOSE, Mary Divya
Title: METAL WORKING POWER SUPPLY CONVERTER SYSTEM AND METHOD
Abstract:
A power supply for welding, cutting and similar operations includes a dual two-switch forward converter. The converter has two inverter circuits coupled in parallel but controlled to provide output power in an interleaved fashion. To avoid walking of the circuits (which could result in different duty cycles and imbalance of the load sharing), control signals are determined and applied to a first of the inverter circuits, and on times of the first circuit is monitored, such as by augmenting a counter to determine the number of clock cycles the first circuit is on. The same duration is then used for commanding output from the second inverter circuit. The duty cycles of both circuits is thus ensured to be the same regardless of changes in the total output power.