Electric heating – Metal heating – By arc
Patent
1982-04-01
1984-12-04
Shaw, C. C.
Electric heating
Metal heating
By arc
2191305, 328181, B23K 910
Patent
active
044866461
ABSTRACT:
Apparatus and a method for generating a ramp voltage for use as a control signal in the electrode circuit of an arc welder. The generator includes an integrator whose input is coupled to a current generator by a switching network controlled by switch logic responsive to the output voltage of the integrator itself. The current generator supplies negative and positive currents alternately to the input of the integrator as a function of the actuation of the switching network so that a ramp voltage characteristic can be obtained in which the ramp voltage, once it reaches a maximum value, will fluctuate at a frequency above 20 kHz between upper and lower limits on either side of a mean value such that the mean value will be constant over time. The output voltage of the integrator is compared with an adjustable reference voltage and the result of the comparison is to provide signals applied to the switching network to ultimately cause negative and positive currents from the current generator to be applied to the integrator at a relatively high frequency, such as a frequency of 50 kHz. One of the signals is amplified to decrease the response time of switching from a first current to the second current and bias means is provided to decrease the response time in switching back from the second current to the first current.
REFERENCES:
patent: 3047820 (1962-07-01), Lawton
patent: 3859603 (1975-01-01), Herzner
patent: 3950706 (1976-04-01), Wilson
patent: 4016498 (1977-04-01), Hadley
patent: 4220927 (1980-09-01), Austin
patent: 4301355 (1981-11-01), Kimbrough et al.
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