The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 17, 1993
Filed:
Dec. 24, 1991
Luigi Pazzaglia, Bologna, IT;
Cefin S.p.A., Bologna, IT;
Abstract
An electronic device for controlling and monitoring the electric power supply to welding equipment includes an inverter driven by a rectifier that supplies voltage to the primary winding of a welding transformer. A secondary winding of the welding transformer delivers welding current that is a function of the voltage applied to the primary winding. The inverter is also interlocked to and piloted by a regulator in such a way that an essentially square wave voltage signal appears with a succession of paired pulses in each half-period of the fundamental frequency, alternately positive and negative and of a given absolute crest value and finite spacing. A periodic welding current is produced of which the pulses are triangular, all positive or negative within the same half-period, and geared to rise and fall once during each cycle of two paired alternating voltage pulses, such that fundamental frequencies can be reduced without loss of operating speed.