| 摘要 |
PURPOSE:To obtain a large output range while maintaining a stable output characteristic and obtain a good-quality and uniform machining surface by providing a coupling capacitor and a coupling coil in series in a circuit, and plural capacitors and their switching means in parallel in part across poles, and switching he values of said capacitors in a proper range. CONSTITUTION:When the on and off operation, at a few MHz, of a switching element 2 is repeated by means of a driving circuit 3, a voltage on both ends of capacitors C2, C3, i.e., a high-frequency AC voltage, is generated across poles 6, to carry out electric discharge machining. The characteristic of the output voltage with respect to variation in floating capacitance 8 depends on the capacitance of a coupling capacitor 9 and the inductance of a coupling coil 10. Also, by selecting the value of a capacitor 11, the output voltage can be greatly stabilized with respect to the variation in the floating capacitance. And, further, by switching the capacitor 11 in a proper range with a relay 12, an output characteristic can be stabilized, obtaining a good-quality and uniform machining surface with a wide range of machining application.
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