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US 4,289,948 AGranted
Automatic voltage compensation for digital welder control system
AssigneeSquare D Company
InventorsDennis J. Jurek, Marvin A. Guettel, Michael Aslin
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AssigneeSquare D Company
InventorsDennis J. Jurek, Marvin A. Guettel, Michael Aslin
Estimating the term…
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.
A digital welder control system for a resistance welder of the type connecting and disconnecting a welding transformer load from an alternating electrical source to control timing periods of the welding sequence and the level of heat intensity in the weld to insure quality welds, comprising:
In a digital welder control system for a resistance welder of the type connecting and disconnecting a welding transformer load from an alternating electrical source to control timing periods of the welding sequence and the level of heat intensity in the weld to insure quality welds, a method comprising:
Dependencies are inferred from the claim text.