Source

Claim 1

IN COMBINATION WITH A UTILIZATION CIRCUIT ARRANGEMENT HAVING A PAIR OF TERMINALS COUPLED TO A FIRST DIRECTCURRENT SUPPLY SOURCE, WITH MEANS INCLUDED IN THE UTILIZATION CIRCUIT ARRANGEMENT TO SELECTIVELY COUPLE A SECOND DIRECT-CURRENT SUPPLY SOURCE TO SAID TERMINALS BY WAY OF CIRCUIT ELEMENTS, WITH THE POLES OF LIKE POLARITY OF THE TWO SAID DIRECT-CURRENT SUPPLY SOURCES COUPLED RESPECTIVELY TO THE SAME TERMINALS OF SAID PAIR, THE SECOND DIRECTCURRENT SUPPLY SOURCE HAVING A POTENTIAL GREATER THAN THAT OF THE FIRST DIRECT-CURRENT SUPPLY SOURCE, THERE BEING EFFECTIVELY A HIGH SERIES IMPEDANCE ON THE FIRST-SUPPLYSOURCE SIDE OF SAID TERMINALS TO CURRENT FLOWING IN A REVERSE DIRECTION CORRESPONDING TO A TRANSFER OF POWER FROM THE SECOND DIRECT-CURRENT SUPPLY SOURCE TOWARD THE FIRST DIRECT-CURRENT SUPPLY SOURCE SO THAT IN RESPONSE TO THE COUPLING BY THE UTILIZATION CIRCUIT ARRANGEMENT OF THE SECOND DIRECT-CURRENT SUPPLY SOURCE TO SAID TERMINALS THE POTENTIAL AT SAID TERMINALS TENDS TO RISE ABOVE SAID NOMINAL VALUE; APPARATUS COMPRISING FIRST VARIABLE IMPEDANCE MEANS CONNECTED IN SHUNT DIRECTLY ACROSS SAID TERMINALS AND FIRST CONTROL MEANS INCLUDING AN AMPLIFYING ARRANGEMENT CONNECTED TO SENSE THE SHUNT POTENTIAL ACROSS SAID TERMINALS AND SUPPLY A CONTROL SIGNAL TO THE FIRST VARIABLE IMPEDANCE MEANS; SECOND VARIABLE IMPEDANCE MEANS CONNECTED IN SERIES BETWEEN THE FIRST DIRECT-CURRENT SUPPLY SOURCE AND THE FIRST VARIABLE IMPEDANCE MEANS, AT LEAST A PART OF SAID HIGH SERIES IMPEDANCE TO REVERSE CURRENT FLOW ON THE FIRST SUPPLY SOURCE SIDE OF SAID TERMINALS BEING THAT PRODUCED BY SAID SECOND VARIABLE IMPEDANCE MEANS, SECOND CONTROL MEANS INCLUDING AN AMPLIFYING ARRANGEMENT CONNECTED TO SENSE THE CURRENT THROUGH THE FIRST VARIABLE IMPEDANCE MEANS AND TO SUPPLY A CONTROL SIGNAL TO THE SECOND VARIABLE IMPEDANCE MEANS;