1973-12-26
1976-01-27
Trammell, James D.
317 31, 317 41, 317 50, H02H 900
Patent
active
039355110
ABSTRACT:
Single or multi phase A.C. power is rectified to yield a D.C. voltage which is adapted to operate an electrical load. At "turn-on" a resistive device is inserted in series with the load until a voltage sensitive relay is energized to close its contacts or an SCR is energized to shunt the resistive device out of the circuit. The resistive device is preferably a PTC element. Several versions include circuitry for reinserting the PTC when the D.C. voltage drops excessively, an indication of impending current surge.
REFERENCES:
patent: 1335507 (1920-03-01), Kazenmaier
patent: 3323017 (1967-05-01), Powell et al.
patent: 3555361 (1971-01-01), Hallberg
Boulanger Henry J.
Brassard Theodore
Baumann Russell E.
Haug John A.
McAndrews James P.
Texas Instruments Incorporated
Trammell James D.
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