Current-loop feedback of spot welding machines

Details Current-loop feedback of spot welding machines Current-loop feedback of spot welding machines

1988-08-08

1989-07-18

Shaw, Clifford C.

Electric heating

Metal heating

For bonding with pressure

B23K 1124

Patent

active

048496014

ABSTRACT:
To control the welding current in a resistance spot welding system, a current measurement sensor is used with a current feedback control to vary the firing angle of power devices in the primary side of the power supply. The closed-loop feedback control assures the desired current is applied independent of variations in the resistance of the welding equipment and primary line voltage variations. In the current feedback control, the commanded current, proportional error, integral error and line voltage offset are summed to derive the firing angle signal, and the power supply is adjusted until actual current equals the desired current.

REFERENCES:
patent: 4447700 (1984-05-01), Cohen
patent: 4516008 (1985-05-01), Jones
patent: 4628176 (1986-12-01), Kojima et al.
patent: 4721906 (1988-01-01), Fergusen et al.

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