Electrical power source for resistance welding apparatus

Details Electrical power source for resistance welding apparatus Electrical power source for resistance welding apparatus

1983-01-13

1985-11-19

Shaw, Clifford C.

Electric heating

Metal heating

For bonding with pressure

219 64, 219110, 363 71, B23K 1124

Patent

active

045544301

ABSTRACT:
An electrical energy source with a static inverter and a welding transformer (12) for a resistance welding machine comprises a first static frequency converter (10) made up of semiconductor elements, the alternating output voltage of which has a frequency and pulse shape which differ from the frequency and pulse shape of the supply voltage fed to the inverter. In this connection, the pulse shape, the amplitude, and the pulse to space ratio are to be variable within wide limits. This is attained by at least one second frequency converter (11) connected in parallel to the first frequency converter (10), wherein the alternating output voltage of the second frequency converter (11) is adapted to be added in phase synchronism to the alternating output voltage of the first frequency converter (10) in the primary circuit of the welding transformer (12).

REFERENCES:
patent: 3636298 (1972-01-01), Riberg et al.
patent: 3708739 (1973-01-01), Kohler et al.
patent: 3893015 (1975-07-01), Weil
patent: 4149233 (1979-04-01), Nagano
patent: 4176392 (1979-11-01), Cronin et al.
patent: 4222098 (1980-09-01), Nagano

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