Electric heating – Metal heating – For bonding with pressure
Patent
1979-07-17
1981-09-15
Shaw, C. C.
Electric heating
Metal heating
For bonding with pressure
219114, 2191171, 323300, B23K 1124
Patent
active
042899486
ABSTRACT:
An automatic voltage compensation control for a microprocessor controlled resistance welder system includes a digital voltmeter for measuring the line voltage cycle by cycle and associated circuitry to compensate the welding current in response to the measured line voltage in a manner which tends to hold the welding current constant and independent of line voltage variations. The digital voltmeter consists of a voltage-to-frequency converter coupled to a counter. The output of the voltage-to-frequency converter which is proportional to the line voltage is accumulated for the period of one cycle of the line frequency. This produces in the counter at the end of each measurement interval, a number of counts proportional to the average line voltage. The microprocessor using the count obtained adjusts the welding current by altering the timing of the firing points of the SCR contactors used to control the welding current.
REFERENCES:
patent: 2806197 (1957-09-01), Rockafellow
patent: 3519917 (1970-07-01), Martin
patent: 3875367 (1975-04-01), Tanaka
patent: 3921058 (1975-11-01), Tanaka et al.
patent: 4104724 (1978-08-01), Dix et al.
Aslin Michael
Guettel Marvin A.
Jurek Dennis J.
Femal Michael J.
Shaw C. C.
Square D Company
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