Patent ID: 8183492
Filing Date: 2012-05-22
Classification: B23H

Abstract:
1. A power supply circuit for a wire electric discharge machining apparatus, comprising: an auxiliary power supply which generates an auxiliary discharge by applying a voltage across a workpiece and a wire electrode; a plurality of main power supplies, a first one of which is electrically connected to an upper terminal block for connecting to an upper electrical supply point and a second one of which is electrically connected to a lower terminal block for connecting to a lower electrical supply point, in order to supplying a main discharging current after the auxiliary discharge from the auxiliary power supply has occurred; and an auxiliary capacitor which is connected to at least one of an upper terminal block or a lower terminal block, wherein the power supply circuit controls the auxiliary power supply and the main power supplies, to machine the workpiece, and a first output end and a second output end of the auxiliary power supply are connected to the upper terminal block and the lower terminal block, respectively.