The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 11, 2014
Filed:
Feb. 26, 2010
Kuniharu Yamada, Fukui, JP;
Tomoyuki Yanagisawa, Fukui, JP;
Kuniharu Yamada, Fukui, JP;
Tomoyuki Yanagisawa, Fukui, JP;
Sodick Co., Ltd., Kanagawa, JP;
Abstract
A power supply device comprises a DC power supply (), a current sensor () for detecting gap current (Igap) flowing through the machining gap, a first switching element () connected in series between the DC power supply and the tool electrode (), a first reverse current prevention diode () connected in parallel with the DC power supply and connected in series with the first switching element (), a second switching element () connected in series between the DC power supply and the workpiece (), a second reverse current prevention diode () connected in parallel with the DC power supply and connected in series with the second switching element (), and a pulse controller () for controlling the first and second switching elements in response to gap current (Igap). From a first time (t) when electric discharge is generated across the machining gap, until a second time (t) when the gap current reaches the peak current during the ON time, both of the first and second switching elements are on. At the second time (t) only one of the first and second switching elements is turned off.