Esab Welding Products, Inc.

Richard A Eldridge

A high frequency arc stabilizing circuit includes a free running oscillator for generating a non-synchronized square wave. An output from the oscillator is buffered and inverted. The asserted and inverted outputs drive field effect transistors coupled to the primary of a high voltage step-up transformer. The circuit can also be gated so as to only operate during selected time intervals.

High frequency arc stabilizer

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.

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Chicago Ridge, IL, United States of America

Richard A Eldridge