Electric heating – Metal heating – By arc
Reexamination Certificate
2005-02-01
2005-02-01
Shaw, Clifford C. (Department: 1725)
Electric heating
Metal heating
By arc
C219S1370PS
Reexamination Certificate
active
06849827
ABSTRACT:
A method and apparatus for providing a welding current is disclosed. The power source is capable of receiving any input voltage over a wide range of input voltages and includes an input rectifier that rectifies the ac input into a dc signal. A dc voltage stage converts the dc signal to a desired dc voltage and an inverter inverts the dc signal into a second ac signal. An output transformer receives the second ac signal and provides a third ac signal that has a current magnitude suitable for welding. The welding current may be rectified and smoothed by an output inductor and an output rectifier. A controller provides control signals to the inverter and an auxiliary power controller that can receive a range of input voltages and provide a control power signal to the controller.
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IBM Technical Disclosure Bulletin, Automatic Input-Selecting Power Supply, Aug., 1985, vol. 28 No. 3, pp. 1246-1247.
Corrigan George R.
Illinois Tool Works Inc.
Shaw Clifford C.
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