Power supply device for electric discharge machining

Details Power supply device for electric discharge machining Power supply device for electric discharge machining

2006-12-12

2006-12-12

Evans, Geoffrey S. (Department: 1725)

Electric heating

Metal heating

Cutting or disintegrating

C320S166000, C323S271000

Reexamination Certificate

active

07148442

ABSTRACT:
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 SW1is turned on, a capacitor C is charged via an inductor L. When the voltage Vc of the charged capacitor exceeds the voltage of a direct-current power source E, a current is returned to the power source E via a diode D2. When the switching element SW1is turned off, energy stored in the inductor L flows from the inductor L through the diode D2, the power source E and the diode D1, so that the voltage Vc of the capacitor C is kept at the power source voltage. When a switching element SW2is turned on, the voltage of the capacitor is applied between an electrode and a workpiece.

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European Search Report for Application No. 05251220.9; dated Jul. 18, 2006.
Japanese Office Action for Application No. 2003-310409; dated Jul. 24, 2006.

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