Circuit arrangement for the electric generator required for the electrolytic machining of metallic conducting materials

Claim 1

IN AN ELECTROLYTIC MACHINING APPARATUS FOR ELECTROLYTICALLY MACHINING METALLIC CONDUCTING MATERIALS, A CIRCUIT ARRANGEMENT COMPRISING AN A.C. SOURCE AND AN A.C. CIRCUIT SUPPLIED THEREBY, A RECTIFIER CONNECTED TO SAID CIRCUIT AND A D.C. CIRCUIT CONNECTED TO SAID RECTIFIER FOR CIRCUITING AN ELECTRODE AND A WORKPIECE PROVIDING A WORKING GAP, A CURRENT-LIMITING NON-LINEAR RESISTANCE IN ONE OF SAID CIRCUITS AND A VOLTAGE-LIMITING ELEMENT ACROSS THE SAID D.C. CIRCUIT, SAID ELEMENT AND THE SAID NON-LINEAR RESISTANCE BEING MATCHED IN SUCH MANNER THAT A MAJOR VOLTAGE RISE BEYOND THE NORMAL WORKING RANGE UNDER NOLOAD CONDITIONS WILL BE SUPPRESSED, AND IN WHICH THE SAID VOLTAGE-LIMITING ELEMEWNT IS A BUFFERING BATTERY WITH A LOW CAPACITY IN AMPERE-HOURS AND WHICH HAS A NO-LOAD DISCHARGING VOLTAGE SMALLER THAN THE VOLTAGE AT WHICH ARCING TAKES PLACE.