Protective circuit

Claim 1

IN A DATA PROCESSING SYSTEM, MEANS FOR GENERATING PERIODIC CONTROL PULSES, MEANS FOR DISABLING SAID GENERATING MEANS IN RESPONSE TO AN ERROR CONDITION IN SAID SYSTEM, A SOURCE OF ELECTRICAL ENERGY, DATA STORAGE MEANS, DRIVE CIRCUITS FOR SAID STORAGE MEANS OPERABLE IN RESPONSE TO SAID PERIODIC CONTROL PULSES, A FIRST CURRENT SUPPLY PATH FROM SAID SOURCE TO SAID DRIVE CIRCUITS, A SECOND CURRENT SUPPLY PATH FROM SAID COURSE TO SAID DRIVE CIRCUITS, SWITCH MEANS RESPONSIVE TO SAID GENERATOR DISABLING MEANS TO CHANGE THE CONNECTION BETWEEN SAID SOURCE OF ELECTRICAL ENERGY AND SAID DRIVE CIRCUITS FROM SAID FIRST TO SAID SECOND CURRENT PATH WHEN SAID GENERATOR IS DISABLED, OVERCURRENT SENSING MEANS IN SAID SECOND PATH INCLUDING A CORE OF MAGNETIC MATERIAL, A FIRST WINDING ON SAID CORE, MEANS CONNECTING SAID FIRST WINDING IN CIRCUIT WITH SAID SECOND CURRENT PATH TO BE TRAVERSED BY A MEASURE OF THE CURRENT PASSING THERETHROUGH, SAID FIRST WINDING BEING OPERATIVE TO INHIBIT REMANENT FLUX CHANGES WHEN THE CURRENT THERETHROUGH EXCEEDS A PREDETERMINED VALVE, DRIVE WINDINGS ON SAID CORE, MEANS INCLUDING SAID DRIVE WINDINGS FOR REVERSING THE REMANENT STATE OF SAID CORE, A SENSE WINDING ON SAID CORE FOR DETECTING FLUX CHANGES WITHIN SAID CORE, AND MEANS CONNECTED TO SAID SENSE WINDING FOR INTERRUPTING THE CONNECTION OF SAID ENERGY SOURCE TO SAID DRIVE CIRCUITS IN RESPONSE TO AN ABSENCE OF DETECTED FLUX REVERSALS.