Source of electrical energy for a resistance-welding machine

Details Source of electrical energy for a resistance-welding machine Source of electrical energy for a resistance-welding machine

B - Operations, Transporting

23

K

327/106

B23K 11/24 (2006.01) H02M 7/48 (2006.01)

Patent

CA 1183578

ABSTRACT An electrical power source for resistance welding apparatus is described. It is conventional in such a power source to use a static inverter and a welding transformer and to incorporate a static frequency converter, usually solid state, which derives an output voltage having a frequency and pulse shape different from the voltage fed to the inverter. According to the invention, one or more parallel additional frequency converters are provided. The output voltages of all the frequency converters are added in phase synchronism in the primary circuit of the welding transformer. The use of at least two frequency converters permits very steep sided pulses to be obtained thus ensuring accurate weld beginnings and ends. The shape, amplitude and work to space ratio of the pulses can be varied within wide limits.

402770

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