Arc welder power supply with fail-safe voltage reducing circuit

Details Arc welder power supply with fail-safe voltage reducing circuit Arc welder power supply with fail-safe voltage reducing circuit

1982-12-10

1984-05-22

Shaw, C. C.

Electric heating

Metal heating

By arc

21913032, B23K 910

Patent

active

044503407

ABSTRACT:
A fail-safe voltage reducing circuit for an arc welder. The welding transformer has two primary windings connected in parallel across a power source. After an arc is struck, if the arc is then broken for a predetermined time period, the circuit automatically disconnects one of the primary windings from the power source, thereby reducing the voltage across the welder's output terminals to a safe standby voltage lower than the full open circuit voltage. If the voltage has not been reduced after a second predetermined time period, the fail-safe feature of the circuit automatically disconnects both primary windings from the power source, thereby completely removing all power from the welder.

REFERENCES:
patent: 2617913 (1952-11-01), Oestreicher
patent: 4100390 (1978-07-01), Jackson

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