Electric heating – Metal heating – By arc
Patent
1990-02-16
1991-12-17
Shaw, Clifford C.
Electric heating
Metal heating
By arc
21913051, B23K 909
Patent
active
050736957
ABSTRACT:
A pulsed welding power supply with short circuit and overcurrent protection. A switching device (55) provides output voltage and output current to the output (17, 18, 19) of a pulse welding power supply. A welding parameter selection means (30, 32, 34, 37) provides a control signal to the switching device (55) which turns the switching device (55) on or off. A short circuit detector (72) monitors the output voltage and inhibits the control signal to the switching device (55) if the output voltage drops below a predetermined value. in order to allow the pulsed welding power supply to start operation, or restart after the short is removed, a resistor (45), connected in parallel with the switching device (55), access a limited current source means which provides a limited output current to the output when the switching device (55) is disabled. If a short circuit is not present at the output then the limited current provided by the resistor (45) will be sufficient to raise the output voltage above the predetermined voltage. The short circuit detector (72 ) will then allow the control signal to enable the switching device (55). An overcurrent detector (73), in conjunction with a resistor (64), monitors the output current and disables the control signal if the output current should exceed a predetermined value. The pulsed welding power supply is therefore protected against a short circuit condition at starting, a short circuit condition during operation, and an overcurrent condition during operation.
REFERENCES:
patent: 3459996 (1969-08-01), Adamson et al.
patent: 3637973 (1972-01-01), Ukai et al.
patent: 3721836 (1973-03-01), Rippel
patent: 3809853 (1974-05-01), Manz
patent: 4954691 (1990-09-01), Parks et al.
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