| 摘要 |
A power supply for an electroerosion machine having a switching element which controls the machining current in the gap. The value of the current is compared with a predetermined voltage and the signal generated based on this comparation is provided to a logic gate, advantageously and "AND" gate, whose output signal is applied to the control electrode of the switching element. Electrode consumption is reduced by using a generally step-type current waveform signal. Machining current during the discharge period may also be controlled to more closely approximate a square wave so that shifting to a faster machining rate can be easily accomplished by accepting some sacrifice in electrode consuption. Preferably, two or more switching and gating devices are used to permit gap current to flow intermittently during the entire discharge period.
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