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:
May. 12, 1987
Filed:
Sep. 26, 1985
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
An arc welding power source utilizing welding current from a two-step voltage conversion comprising a first target value setting circuit means for setting a first current target value V.sub.1 corresponding to a desired value of welding current, a current control circuit for controlling the welding current in accordance with the first current target value V.sub.1, a second target value setting circuit means for setting a second current target value V.sub.2 higher than the first current target value for satisfying a predetermined current waveform in response to an abrupt load variation, and a rapid operation current control circuit for controlling the welding current in accordance with the second current target value V.sub.2. Thus, even if the welding load tends to abruptly vary and the welding current tends to largely exceed the first current target value V.sub.1, the welding current is clipped by the second current target value V.sub.2 by the rapid operation current control circuit having a rapid response so as to maintain the actual welding current in the allowable V.sub.1 -V.sub.2 range.