Electric discharge machining power supply circuit
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United States of America Patent
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-
Dec 18, 1990
Grant Date -
N/A
app pub date -
May 25, 1989
filing date -
May 27, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The power supply circuit has an inductor connected to a DC source through a regulating circuit arranged to maintain a constant current in the inductor. A MOSFET is connected to the inductor and to the spark gap so that when the MOSFET is conducting, current is diverted from the inductor to the spark gap. The frequency and mark-space ratio of switching of the switching device is controlled to control the machining process. A second switching device (40) is arranged to conduct when the voltage across a capacitor (34) exceeds a reference voltage. A diode (46) is used to return excess energy to the DC source.
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