Solid state weld timer

Details Solid state weld timer Solid state weld timer

1975-06-18

1977-04-05

Shoop, William M.

Electricity: power supply or regulation systems

Remote sensing

219131WR, G05F 156

Patent

active

040164845

ABSTRACT:
A solid state timer for controlling the duration of an A.C. excitation delivered to a load. A relay-tripped trigger pulse generator activates a rectangular waveform generator, whose adjustable duration output controls the gate of a silicon controlled rectifier. The rectifier controls a diode bridge circuit to switch a full wave excitation to the load for the duration of the rectangular waveform. The timer finds particular application in welding circuitry.

REFERENCES:
patent: 3286158 (1966-11-01), Thatcher
patent: 3365654 (1968-01-01), Johnston
patent: 3395334 (1968-07-01), Stein
patent: 3493835 (1970-02-01), Hellmann
patent: 3783367 (1974-01-01), Yamamoto et al.

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