POWER SOURCE DEVICE FOR ELECTRIC DISCHARGE MACHINE
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Applicant
Ltd. Makino Milling Machine Co.
Representative
David John McWilliams
Application number
EP18938320A1
Kind
A1
Document number
3875201
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POWER SOURCE DEVICE FOR ELECTRIC DISCHARGE MACHINE

3875201 - EP18938320A1 - EPO

Application Oct 31, 2018 - Publication Sep 08, 2021

Naoto YOKOYAMA

Abstract

A power supply device (1) for an electric discharge machine includes a current supply unit (11) for supplying a pulsed current to an electrode gap (4) and a current regeneration unit (12) for regenerating the current. The current supply unit (11) includes a DC power supply (21), a first switching element (22), and a second switching element (23). The current regeneration unit (11) includes a capacitor (31) arranged between a first connection point (42) between an electrode (3) and the first switching element (22) and a second connection point (41) between a workpiece (2) and the second switching element (23), and a third switching element (32) which is arranged betweena third connection point (43) between the first connection point (42) and the DC power supply (21) and a fourth connection point (44) between the second connection point (41) and the capacitor (31) and which is turned on from the start of current regeneration until the current value reaches zero, whereby regeneration current fall time is reduced.

Description

Claims

Patent References

Patent Publication Date Title
JP7116923A N/A N/A
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