| 摘要 |
<p>A power source for an electric spark machine capable of generating machining pulses having a large peak value and a small pulse width contributing to increasing the machining rate. When the voltage applied between the work (W) and the tool electrode (P) from the power source for electric discharge machining is interrupted by the transistors (T1, T2), a feedback current caused by the energy stored in the stray inductances (L1, L2) is fed back to a high voltage smoothing capacitor (C2) via feedback diodes (D1, D2), and the capacitor is electrically charged up to a voltage that exceeds the power source voltage. Therefore, the feedback current suddenly rises. Thereafter, the transistor (T3) is rendered conductive in response to the output of the comparator (1) that is generated when the reference voltage (VL) is exceeded by a partial voltage that corresponds to the charging voltage of the capacitor, and the charge of the capacitor is fed back to the power source voltage smoothing capacitor (C1) via the transistor and impedance (Z).</p> |
