Electric heating – Metal heating – By arc
Patent
1981-02-19
1983-07-05
Shaw, C. C.
Electric heating
Metal heating
By arc
21913051, B23K 910
Patent
active
043920454
ABSTRACT:
A three-phase thyristor (42, 42) 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: 3308265 (1967-03-01), Hobart
patent: 3549978 (1970-12-01), Stearns et al.
patent: 3683149 (1972-08-01), Mages 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" General Electric SCR Manual Fifth Edition, Copyright 1977.
LandOfFree
Thyristor controlled welding power supply does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Thyristor controlled welding power supply, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Thyristor controlled welding power supply will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1441589