Resistance welding power supply apparatus
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
N/A
Issued Date -
Sep 27, 2001
app pub date -
Mar 20, 2001
filing date -
Mar 23, 2000
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
This power supply apparatus comprises a charging circuit for charging a capacitor. The charging circuit includes a transformer, a rectifying circuit, a switching element, an inductance coil and a freewheeling diode. The rectifying circuit full-wave rectifies an AC power supply voltage acquired on the secondary side of the transformer to provide a DC voltage as its output. When the switching element is turned on or becomes conductive, a DC current is allowed to flow through a circuit extending from a positive output terminal of the rectifying circuit through the switching circuit and the inductance coil to a negative output terminal of the rectifying circuit. Once the switching element is switched from its ON state to OFF state, a current based on the inductance coil flows in the forward direction of the diode through a closed circuit consisting of the inductance coil, capacitor and the diode such that the capacitor is charged with the freewheeling current.
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