Electric heating – Metal heating – For bonding with pressure
Patent
1995-05-26
1998-12-01
Shaw, Clifford C.
Electric heating
Metal heating
For bonding with pressure
B23K 1124
Patent
active
058441930
ABSTRACT:
A control equipment for a resistance welding machine for welding a material by the Joule 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: 2151749 (1939-03-01), Dawson
patent: 4973815 (1990-11-01), Ito et al.
patent: 5196668 (1993-03-01), Kobayashi et al.
patent: 5360959 (1994-11-01), Takano et al.
patent: 5406045 (1995-04-01), Kiriishi et al.
patent: 5489757 (1996-02-01), Schuermann et al.
Patent Abstracts of Japan, vol. 18, No. 332 (E-1567), Jun. 23, 1994, JP 06 078565, Mar. 18, 1994.
Ambo Tatsuaki
Nomura Yoshihito
Okado Chihiro
Souma Saburo
Kabushiki Kaisha Toshiba
Shaw Clifford C.
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