Resistance-welding power supply apparatus
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United States of America Patent
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-
Nov 20, 2001
Grant Date -
N/A
app pub date -
Oct 22, 1998
filing date -
Oct 29, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Disclosed is a resistance-welding power supply apparatus comprising a large-capacitance capacitor for storing a welding energy in the form of electric charge, a charging unit for charging the capacitor up to a predetermined voltage, a transistor group electrically connected between the capacitor and a welding electrode on one hand, and a control unit for causing a switching action of the transistor group at a predetermined frequency during the weld time to provide a control of a welding current I. The charging unit includes a charging transformer and a rectifying circuit. The control unit includes a main control unit for providing a control of the switching action of the transistor group by way of a drive circuit. The control unit further includes various sensors, measuring circuits and an arithmetic circuit, for providing a feedback control of the welding current, an interelectrode voltage or a welding power.
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