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:
Aug. 06, 2002
Filed:
Feb. 15, 2000
Daisuke Sadamitsu, Kanagawa, JP;
Yuji Kaneko, Kanagawa, JP;
Sodick Co., Ltd., Kanagawa, JP;
Abstract
A power supply for an electric discharge machine which provides electrical power intermittently for discharge machining in a machining gap formed between an electrode and a work piece. The power supply comprises a direct current power source, a switching element connected between the direct current power source and the processing gap, a gate pulse generating circuit which generates a gate pulse signal for energizing the switching element and a protection network connected between the switching element and the gate pulse generating circuit. The protection network comprises a clock pulse generator which generates clock pulses, a counter which counts clock pulses while gate pulse signals are being received and generates an output having a predetermined level when the count reaches a predetermined value, a latch circuit which maintains the output of the predetermined level of the counter while the gate pulse signal is being received, and an AND gate which prevents gate pulse signal from being supplied to switching element while the latch circuit maintains the output of the counter as the predetermined level.