Boots – shoes – and leggings
Patent
1986-06-27
1989-04-11
Kemeny, Emanuel S.
Boots, shoes, and leggings
364513, 21912402, 21913021, 901 42, G06F 1546, B23K 910
Patent
active
048212024
ABSTRACT:
A microprocessor-controlled arc welding power supply. A silicon controlled rectifier ("SCR") bank is used to generate a direct current arc welding current under program control. Positive synchronization 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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Davis Clint A.
Trail Melvin P.
Beckworth Davis International Inc.
Kemeny Emanuel S.
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