Method and apparatus for determining the power factor of a circu

Details Method and apparatus for determining the power factor of a circu Method and apparatus for determining the power factor of a circu

1988-07-14

1989-07-25

Shaw, Clifford C.

Electric heating

Metal heating

For bonding with pressure

219114, 323246, 324 83D, B23K 1124

Patent

active

048516350

ABSTRACT:
Structure for and method of controlling the firing point of thyristors in a phase controlled contactor in a resistance welding circuit in accordance with variations in current line voltage and/or one of resistance and inductive impedance in the welding circuit including structure for and the method of determining the firing point in a cycle of alternating electrical energy fed to the welder in terms of its distance from zero voltage cross over point and determining the current lag after a subsequent zero voltage cross over point of the voltage signal, determining the power factor of the welding circuit from these angular measurements and selecting a new firing delay for the contactor in accordance with the circuit power factor and the percent heat selected in the welding circuit, and subsequently correcting the firing delay in accordance with the percent heat selected in view of changes in the line voltage and circuit current.

REFERENCES:
patent: 2961596 (1960-11-01), Rockafellow
patent: 4104724 (1978-08-01), Dix et al.
patent: 4254466 (1981-03-01), Jurek
patent: 4271387 (1981-06-01), Mukai et al.
patent: 4289948 (1981-09-01), Jurek et al.
patent: 4289951 (1981-09-01), Jurek
patent: 4321529 (1982-03-01), Simmonds et al.
patent: 4343980 (1982-08-01), Stanya et al.

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