Power supply apparatus with initial arcing sustaining circuit

Details Power supply apparatus with initial arcing sustaining circuit Power supply apparatus with initial arcing sustaining circuit

1997-10-21

1999-03-02

Riley, Shawn

Electric power conversion systems

Current conversion

With auxiliary bucking or boosting emf

2191304, H02M 700

Patent

active

058779523

ABSTRACT:
Power supply apparatus includes a converter which converts a commercial AC voltage into a DC voltage. An inverter converts the DC voltage into a high frequency voltage. The high frequency voltage is voltage-transformed by a transformer, and then rectified and smoothed by a rectifier and a smoothing reactor into a DC voltage. This DC voltage is applied between a workpiece and a torch. A high frequency voltage generator generates a high frequency voltage and applies it to a primary winding of a coupling transformer. A boosted high frequency voltage is induced in a first secondary winding and applied between the workpiece and the torch, so that arcing is initiated. The coupling transformer includes a second secondary winding in which another high frequency voltage is induced. The high frequency voltage induced in the second secondary winding is converted into a DC voltage by a diode and a smoothing capacitor for application between the workpiece and the torch, so that the arcing is sustained.

REFERENCES:
patent: 4517439 (1985-05-01), Colley
patent: 4876433 (1989-10-01), Kashima et al.
patent: 4897522 (1990-01-01), Bilczo et al.
patent: 5444356 (1995-08-01), Reynolds et al.

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