Consumable electrode DC arc welder

Details Consumable electrode DC arc welder Consumable electrode DC arc welder

1998-01-20

1999-08-24

Shaw, Clifford C.

Electric heating

Metal heating

By arc

219137PS, B23K 9095

Patent

active

059421398

ABSTRACT:
DC power from a smoothing capacitor is converted into high frequency power by an inverter, and then lowered by an output transformer. The lowered high frequency power is converted into DC power by an output rectifier and a DC reactor, and then supplied to a load. The load is short-circuited and then opened to initiate arcing. The short-circuiting and the arcing alternate. An auxiliary rectifier provides a load-voltage representative signal, and a current detector detects a load current. A load-current representative signal is differentiated by a differentiation circuit. The signals from the auxiliary rectifier, the current detector and the differentiation circuit, and a reference signal are applied to an operational amplifier. A control circuit controls the inverter such that the output of the operational amplifier can be zero. An integration circuit receives at least the load-voltage representative signal to detect a period of a cycle consisting of the arcing and the short-circuiting and provide an operation-cycle-period representative signal to the operational amplifier.

REFERENCES:
patent: 3792225 (1974-02-01), Needham et al.
patent: 4349720 (1982-09-01), Makimaa
patent: 5272314 (1993-12-01), Moriguchi et al.
patent: 5457300 (1995-10-01), Karino et al.

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