Abstract: The present invention is equipped with a series circuit that includes a DC power supply, switching elements and a diode for supplying DC or AC current pulses to a machining gap between a machining electrode and a workpiece, diodes that regulate a direction of the current flow to one direction, and a control unit that controls the switching elements. When the control unit generates a current pulse having a triangular waveform by an inductance that is present in the series circuit, the control unit controls the switching elements in order that a current-pulse time ratio that is a ratio between the non-current time and the current continuation time in the current pulse is equal to or lower than 1/5.

Abstract: The present invention includes a series circuit that includes a DC power supply and a switching element for supplying a DC or AC current pulse to a machining gap between a machining electrode and a workpiece; and a control unit that controls the switching element, wherein when generating a current pulse having a triangular shape by an inductance present on the series circuit, the control unit controls on-time and off-time of the switching element such that a peak value of an arbitrary current pulse in a pulse train including a plurality of current pulses changes.

Abstract: The present invention includes a series circuit that includes a DC power supply and a switching element for supplying a DC or AC current pulse to a machining gap between a machining electrode and a workpiece; and a control unit that controls the switching element, wherein when generating a current pulse having a triangular shape by an inductance present on the series circuit, the control unit controls on-time and off-time of the switching element such that a peak value of an arbitrary current pulse in a pulse train including a plurality of current pulses changes.

Abstract: The present invention is equipped with a series circuit that includes a DC power supply, switching elements and a diode for supplying DC or AC current pulses to a machining gap between a machining electrode and a workpiece, diodes that regulate a direction of the current flow to one direction, and a control unit that controls the switching elements. When the control unit generates a current pulse having a triangular waveform by an inductance that is present in the series circuit, the control unit controls the switching elements in order that a current-pulse time ratio that is a ratio between the non-current time and the current continuation time in the current pulse is equal to or lower than ?.

Abstract: In an electric discharge machining, in order to reduce damage of an object to be machined and an electrode and to achieve machining velocity enhancement and reduction of electrode wear amount by appropriately controlling a short-circuit current that flows when the electrode and the object to be machined are short-circuited, an electric-discharge-machining power supply apparatus for machining an object to be machined by interrupting every predetermined time period pulse trains that are turned on and off at predetermined timing, to supply electric power to a machining gap between a machining electrode (2) and the object (3) to be machined includes: a short circuit detecting means (11) for detecting a short circuit at the machining gap between the machining electrode (2) and the object (3) to be machined; and a pulse halting means (12) for, when the short circuit detecting means (11) detects a short circuit occurrence at the machining gap, halting generation of particular pulses in the pulse train so as to halt

Abstract: In order to obtain an electric-discharge-machining power supply apparatus that can flow discharge current pulses through the machining gap uniformly and efficiently, and can realize reduction of the amount of electrode wear in machining in the alternate current pulse system, in an electric-discharge-machining power supply apparatus (2) for applying electric-discharge-machining pulse voltage to a machining gap between a machining electrode (8) and an object (9) to be machined, wherein a circuit (22) composed of a parallel connection of a rectifying element (24) and a resistive element (23) is inserted in series along a wiring path extending from an electric-discharge pulse generating unit (6) to the machining gap, and the rectifying element (23) is so connected as to cause machining pulse currents to flow in an intended direction during the electric discharge generation.

Abstract: In order to obtain an electric-discharge-machining power supply apparatus that can flow discharge current pulses through the machining gap uniformly and efficiently, and can realize reduction of the amount of electrode wear in machining in the alternate current pulse system, in an electric-discharge-machining power supply apparatus (2) for applying electric-discharge-machining pulse voltage to a machining gap between a machining electrode (8) and an object (9) to be machined, wherein a circuit (22) composed of a parallel connection of a rectifying element (24) and a resistive element (23) is inserted in series along a wiring path extending from an electric-discharge pulse generating unit (6) to the machining gap, and the rectifying element (23) is so connected as to cause machining pulse currents to flow in an intended direction during the electric discharge generation.

Abstract: In an electric discharge machining, in order to reduce damage of an object to be machined and an electrode and to achieve machining velocity enhancement and reduction of electrode wear amount by appropriately controlling a short-circuit current that flows when the electrode and the object to be machined are short-circuited, an electric-discharge-machining power supply apparatus for machining an object to be machined by interrupting every predetermined time period pulse trains that are turned on and off at predetermined timing, to supply electric power to a machining gap between a machining electrode (2) and the object (3) to be machined includes: a short circuit detecting means (11) for detecting a short circuit at the machining gap between the machining electrode (2) and the object (3) to be machined; and a pulse halting means (12) for, when the short circuit detecting means (11) detects a short circuit occurrence at the machining gap, halting generation of particular pulses in the pulse train so as to halt