| 摘要 |
PCT No. PCT/JP84/00478 Sec. 371 Date Jun. 10, 1985 Sec. 102(e) Date Jun. 10, 1985 PCT Filed Oct. 11, 1984 PCT Pub. No. WO85/01685 PCT Pub. Date Apr. 25, 1985.A wire-cut, electric discharge machining power supply unit charges a capacitor (4) by a DC power source (2) via a switching element (1), and discharges the stored charges of the capacitor (4) between a workpiece (6) and a wire electrode (7) via another switching element (5). A single-polarity discharge current of a small pulse width is supplied between the wire electrode (7) and the workpiece (6). A series circuit of an impedance element (50, 80) other than a capacitance and a diode (51), is connected in a backward direction with respect to a capacitor charging voltage to effect recharging of the capacitor (4) with high efficiency.
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