| 摘要 |
PROBLEM TO BE SOLVED: To provide a power circuit for electric discharge machining, an electric discharge machining device, and an electric discharge machining method allowing uniform micro electric discharge machining at a high duty ratio using a transistor electric discharge circuit. SOLUTION: This power circuit 10 for electric discharge machining has a direct current power supply 14 of which positive pole is connected to work piece 11 and negative pole is connected to a tool electrode 12 via a switching element 13 controlled by an output resistor and a driving circuit 15. The power circuit 10 comprises a non-contact type current sensor 20 for outputting, as a voltage signal, variation of current flowing through a discharge circuit from the direct current power supply through the tool electrode, the work piece, the output resistor, and a switching element back to the direct current power supply, and a pulse control circuit 22 for detecting discharge current based on the voltage signal from the non-contact type current sensor and outputting a detection signal. The driving circuit 15 turns off the switching element 13 in response to the detection signal from the pulse control circuit 22.
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