Power supply apparatus for arc-utilizing equipment

Electric power conversion systems – Current conversion – With condition responsive means to control the output...

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21913032, H02M 3335, H23K 9095

Patent

active

057515689

ABSTRACT:
A power supply apparatus for arc-utilizing equipment includes a first converter for converting a received AC voltage to a DC voltage.
An inverter converts the DC voltage to a high-frequency voltage, which is applied to a voltage-transformer with primary and second windings. A voltage-transformed high-frequency voltage induced in the secondary winding is converted to a DC voltage in a second converter, which is developed between two output terminals. The respective ones of the two output terminals are connected to a torch electrode of the arc-utilizing equipment and a workpiece. A bypass capacitor and a high-frequency voltage generator circuit are serially connected between the two output terminals. A control circuit controls the high-frequency voltage generator circuit and the inverter circuit. The bypass capacitor is connected directly between one of the two output terminals and the high-frequency voltage generator circuit.

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patent: 4845393 (1989-07-01), Burgess et al.
patent: 4985819 (1991-01-01), Mori et al.
patent: 5023768 (1991-06-01), Collier
patent: 5070440 (1991-12-01), Walker
patent: 5262699 (1993-11-01), Sun et al.
patent: 5457300 (1995-10-01), Karino et al.

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