Method for controlling and synchronizing a welding power supply

Details Method for controlling and synchronizing a welding power supply Method for controlling and synchronizing a welding power supply

1988-10-18

1992-09-22

Shaw, Clifford C.

Electric heating

Metal heating

By arc

21913031, 21913032, 219132, 219137PS, B23K 910

Patent

active

051499401

ABSTRACT:
A microprocessor-controlled arc welding power supply is disclosed. An silicon controlled rectifier ("SCR") bank is used to generate a direct current arc welding current under program control. Positive sychronization is provided by the microprocessor using a phase locked loop and a polarity detector, so that the gating signals applied to the SCRs are correctly timed. Optimum tradeoffs between hardware and software are accomplished by using look up tables to store correction factors that can be quickly accessed during execution, and by using timers as smart interface chips to fire the SCRs at the same angle during each cycle until changed or updated by the microprocessor. The arc welding power supply is capable of operating in a constant current or constant voltage mode without rewiring the circuit.

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Random House Dictionary of the English Language, p. 135, 1980.

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