Control equipment for resistance welding machine

Details Control equipment for resistance welding machine Control equipment for resistance welding machine

1997-09-08

1999-10-12

Shaw, Clifford C.

Electric heating

Metal heating

For bonding with pressure

B23K 1124

Patent

active

059650389

ABSTRACT:
A control equipment for a resistance welding machine for welding a material by the Joule's heat generated in the material by applying an electric power to the material, including an inverter for converting a DC voltage to an AC voltage by pulse width modulation control, a transformer having a primary winding to which the AC voltage is applied and having a secondary winding which supplies an AC current to the material, and a control unit for generating an AC current reference with a rectangular waveform of a specified frequency, comparing the AC current reference with an output current of the inverter to obtain an error, and for PWM controlling the inverter so that the error becomes zero.

REFERENCES:
patent: 4910375 (1990-03-01), Izume
patent: 4988942 (1991-01-01), Ekstrand
patent: 5489757 (1996-02-01), Schuermann et al.
patent: 5570254 (1996-10-01), Spilger et al.

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