Power supply unit for a resistance welding apparatus
AssigneeFronius International GmbH
InventorsDaniel Itzenberger, Martin Hoertenhuber
Life of this patent
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Abstract
A power supply unit for a resistance welding apparatus, said power supply unit comprising a converter circuit adapted to convert an alternating power supply current, AC, applied via a residual current protection circuit to an input of said converter circuit into a pulsed electrical current supplied from an output of said converter circuit to a primary coil of a transformer of said resistance welding apparatus, and at least one switching element provided between the output of said converter circuit and protective earth.
Claims24
A power supply unit for a resistance welding apparatus, said power supply unit comprising:
- a converter circuit adapted to convert an alternating current, AC, of a power supply with protective earth applied via a residual current protection circuit to an input of said converter circuit into a pulsed electrical current supplied from an output of said converter circuit to a primary coil of a transformer of said resistance welding apparatus, and
- at least one switching element provided between the output of said converter circuit and protective earth.
A resistance welding apparatus comprising
- a power supply unit having
- a converter circuit adapted to convert an alternating current, AC, of a power supply with protective earth applied via a residual current protection circuit to an input of said converter circuit into a pulsed current supplied from an output of said converter circuit to a primary coil of a transformer of said resistance welding apparatus and having at least one switching element provided between the output of said converter circuit and protective earth,
- said resistance welding apparatus further comprising a resistance welding equipment connected to a secondary coil of said transformer.
A method for performing resistance welding,
- wherein an alternating current, AC, of a power supply with protective earth applied via a residual current protection circuit is converted into a pulsed current transformed by a transformer into an electrical current supplied to a resistance welding equipment,
- wherein during welding intermissions a primary coil of said transformer is automatically switched by a switching element to protective earth potential.
Dependencies are inferred from the claim text.