Current control device and method

Details Current control device and method Current control device and method

1975-12-17

1978-02-28

Truhe, J. V.

Electric heating

Metal heating

For bonding with pressure

219114, 323 19, B23K 1124

Patent

active

040769747

ABSTRACT:
A circuit for improved control of current for use in conjunction with an inductive load, for example, a transformer in a welding operation. The circuit of this invention is adapted to maintain the percentage of total RMS current demand directly proportional to a reference signal. A nonlinear control signal generator is provided to supply a control signal which is compared to the reference signal to operate a switch means for controlling the flow of current in the inductive load.

REFERENCES:
patent: 2961596 (1960-11-01), Rockafellow
patent: 3176215 (1965-03-01), Kusko
patent: 3501771 (1970-03-01), Miller et al.
patent: 3694615 (1972-09-01), Brandeis
patent: 3715651 (1973-02-01), Ott
patent: 3875367 (1975-04-01), Tanaka
patent: 3936726 (1976-02-01), Kelley, Jr.
patent: 3942041 (1976-03-01), Morriss
patent: 4004214 (1977-01-01), Evans

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