Inverter-type resistance welding machine

Details Inverter-type resistance welding machine Inverter-type resistance welding machine

1987-09-10

1990-03-20

Shaw, Clifford C.

Electric heating

Metal heating

For bonding with pressure

B23K 1124

Patent

active

049103750

ABSTRACT:
The present invention is directed to an inverter-type resistance welding machine. A PWM inverter supplies high frequency primary voltage to a transformer. A microprocessor controls the PWM inverter by proportional-integral-deviation (PID) control through a PWM control unit. The microprocessor determines a feedforward operation amount which corresponds to a desired welding current value before current is supplied to the welding electrodes. The time period for the calculation of an integral operation amount is effectively reduced to approximately zero by employing a calculated integral operation amount from a previous sampling.

REFERENCES:
patent: 4104724 (1988-08-01), Dix et al.

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