| 摘要 |
A power supply circuit for a wire electric discharge machining apparatus includes an auxiliary power supply (3) for generating an auxiliary discharge by applying a voltage between a workpiece (2) and a wire electrode (1); and a plurality of main power supplies (4 and 5), a first one of which electrically connected to an upper terminal block (9) for connecting to an upper electrical supply point (6) and a second one of which electrically connected to a lower terminal block (11) for connecting to a lower electrical supply point (7), in order to supply a main discharging current after the auxiliary discharge has occurred; wherein the power supply for the wire electric discharge machining apparatus controls the auxiliary power supply (3) and the plurality of main power supplies (4 and 5), to machine the workpiece (2), and a first end of the auxiliary power supply is connected to the upper terminal block (9) and a second end thereof to the lower terminal block (11).
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