Electric heating – Metal heating – Cutting or disintegrating
Patent
1991-03-01
1995-03-21
Evans, Geoffrey S.
Electric heating
Metal heating
Cutting or disintegrating
B23H 102
Patent
active
053998251
ABSTRACT:
An electric discharge machining power supply has a capacitor which is recharged using an inductor. After a spark, a transistor switch is closed, and energy from a source is stored in the inductor. The inductor charge period allows for deionization of the spark gap. After the desired amount of energy has been stored in the inductor, the transistor switch is opened, and the energy in the inductor is transferred to a capacitor. When the capacitor is charged, the gap voltage increases to its breakdown value for spark ignition. Because the energy transfer from the inductor to the capacitor is faster than the spark ignition delay, the capacitor is fully charged before the next spark occurs. After the spark ignition delay, a new spark is generated and the cycle is repeated. Other controls and elements are added. Gap voltage is sensed at a point intermediate two resistors between the source and the discharge electrode. A short across the gap is sensed. An inductor/transformer isolates the power source and spark.
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Creare Inc.
Creighton Wray James
Evans Geoffrey S.
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