| 摘要 |
PURPOSE:To obtain a machining power source with a stable output characteristics by connecting a coupling capacitor and a coupling reactor in series between a switching element and a part across poles and providing a driving circuit in which an oscillating frequency is specified. CONSTITUTION:A switching element 2 carries out switching at a frequency of 1 to 5MHz by means of a driving circuit 3, and supplies a high-frequency AC voltage to a part across poles 6 via a series circuit of a coupling capacitor 9 and a coupling coil 10. By properly setting the value of capacitance of the coupling capacitor 9 and the value of inductance of the coupling coil 10, a machining power source with extremely stable output characteristics with respect to variation in floating capacitance 8 and floating inductance 4 which is specific to electric discharge machining, can be obtained. Thereby, a good- quality and uniform machining surface can always be obtained while eliminating a tuning system which makes a switching frequency variable, and supplying a low-cost power source.
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