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:
Dec. 15, 1987
Filed:
Nov. 16, 1984
Richard A Eldridge, Chicago Ridge, IL (US);
ESAB Welding Products, Inc., Chicago, IL (US);
Abstract
A welding power system is described wherein a programmable controller and a conventional power supply are coupled by a circuit which simulates a control potentiometer. The coupling circuit provides an adjustable output signal intermediate between high and low potentials depending upon the level of an input control signal. The coupling circuit converts the input control signal into a pulse width modulated signal, multiplexes the high and low potentials in accordance with the pulse width modulated signal, and time-averages the multiplexed signal to provide an output control signal. An optical isolator is preferably included for direct current isolation of the input and output signals.