Resistance welding power supply apparatus
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United States of America Patent
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-
Oct 1, 2002
Grant Date -
Dec 27, 2001
app pub date -
Jun 18, 2001
filing date -
Jun 19, 2000
priority date (Note) -
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Abstract
Disclosed is a resistance welding power supply apparatus which comprises a large-capacitance capacitor for storing resistance welding energy in the form of electric charges, a charging circuit for charging the capacitor to a predetermined voltage, four switching elements or means electrically connected between the capacitor and a pair of welding electrodes, and a control unit for allowing selective switching operations of the switching elements during a weld time to provide a control of welding current. Diodes are connected in parallel with the switching elements, respectively, with current polarities opposite thereto. The control unit terminates a switching pause period for polarity switching in a very brief time and initiates a switching control in the next current-supplying mode in the middle of fall of the welding current.
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