Remote control of open circuit voltage in a welding power supply

Details Remote control of open circuit voltage in a welding power supply Remote control of open circuit voltage in a welding power supply

1983-04-11

1984-08-21

Shaw, C. C.

Electric heating

Metal heating

By arc

2191301, B23K 910

Patent

active

044671741

ABSTRACT:
A three-phase thyristor (42, 43) controlled welding output supply requiring only a single firing pulse of short duration per phase per half cycle is shown. Once a firing pulse has been provided (122), a holding impedance (40) connected between the output electrodes (32, 34) is provided to the neutral terminal (18) of a wye wound secondary (17) to provide a path for holding current independently of the load presented by the arc. An improved firing control circuit includes in addition to the normal firing capacitor (82), a negative phase angle impedance (86, 87, 88) attached to one end of a conventional breakdown device (117) used to fire a master thyristor gate (119). Stepped up voltage (60) is provided to the control circuit for greater noise immunity. Also shown is a remote control (151) for controlling a reversible motor (150) to drive through a slip clutch (140), the main voltage controlling variable impedance (80).

REFERENCES:
patent: 2642515 (1953-06-01), Bagg
patent: 2872566 (1959-02-01), Leppala
patent: 3308265 (1967-03-01), Hobart
patent: 3477005 (1969-11-01), Weems
patent: 3549978 (1969-04-01), Stearns
patent: 3683149 (1972-08-01), Mayes et al.
patent: 3883714 (1975-05-01), James
patent: 3912980 (1975-10-01), Crump et al.
patent: 4247752 (1981-01-01), Stringer
Chapter 9 "AC Phase Control," GE SCR Manual, 5th Edition, .COPYRGT.1977.

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