| 摘要 |
An electric-discharge-machining power supply device in which energy loss is hardly produced and a charge voltage of a capacitor is easily controlled. When a switching element SW 1 is turned on, a capacitor C is charged via an inductor L. When the voltage Vc of the charged capacitor exceeds the voltage of direct-current power source E, a current is returned to the power source E via a diode D 2 . When the switching element SW 1 is turned off, energy stored in the inductor L flows from the inductor L through the diode D 2 , the power source E and the diode D 1 , so that the voltage Vc of the capacitor C is kept at the power source voltage. When a switching element SW 2 is turned on, the voltage of the capacitor is applied between an electrode and a workpiece. Since the charging circuit does not include a resistor and energy stored in the inductor L is returned to the direct-current power source E, no energy loss is produced. Further, the voltage Vc of the charged capacitor C can be controlled by adjusting the power source voltage.
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