| 摘要 |
A machining power supply device (1) for an electric discharge machine performs control to turn on a first semiconductor switching element (S1), which is arranged in series between a DC power supply (V) and a capacitor (C) connected in parallel with a machining gap between an electrode (2) and a workpiece (3), to charge the capacitor (C), and turn on a second semiconductor switching element (S2), which is arranged in parallel with the capacitor (C) within a period in which the first semiconductor switching (S1) element is off. |
