Regulator circuit for battery chargers

Claim 1

A BATTERY CHARGER CIRCUIT HAVING FIRST AND SECOND OUTPUT LEADS RESPECTIVELY ADAPTED FOR DISTINCTIVE CONNECTION TO THE POSITIVE AND NEGATIVE TERMINALS OF A BATTERY TO BE CHARGED, SAID CIRCUIT COMPRISING, A POSITIVE AND A NEGATIVE OUTPUT LEAD RESPECTIVELY CONNECTED TO SAID OUTPUT TERMINALS, A THREE TERMINAL SILICON CONTROLLED RECTIFIER HAVING A TWO TERMINAL CONDUCTION PATH CONNECTED IN A FORWARD DIRECTION THROUGH SAID OUTPUT LEAD AND A THIRD, CONTROL ELECTRODE, AN AMPLIFYING TRANSISTOR HAVING A CONDUCTION PATH CONNECTED IN SERIES WITH A CONTROL VOLTAGE DEVELOPING RESISTOR FOR SAID CONTROLLED RECTIFIER, MEANS FOR CONNECTING SAID OUTPUT LEADS TO A SOURCE OF ALTERNATING CURRENT, A ZENER DIODE POLED AND CONNECTED FOR CONDUCTION IN A REVERSE DIRECTION FROM SAID OUTPUT LEAD TO A CONTROL ELECTRODE OF SAID AMPLIFYING TRANSISTOR, VOLTAGE DROPPING RESISTOR MEANS CONNECTED IN CONTROLLING RELATION WITH CONTROL TERMINALS OF SAID CONTROLLED RECTIFIER AND IN SERIES WITH CONDUCTION TERMINALS OF SAID AMPLIFYING TRANSISTOR, SAID AMPLIFYING TRANSISTOR BEING POLED AND CONNECTED WITH SAID RESISTOR MEANS CONNECTED IN CONTROLLING RELATION WITH CONTROLLED RECTIFIER UPON CONDUCTION THROUGH SAID LAST NAMED TRANSISTOR, WHEREBY CURRENT IS PASSED THROUGH SAID ZENER DIODE TO ALLOW CONDUCTION BY SAID AMPLIFYING TRANSISTOR AS VOLTAGE APPLIED TO SAID OUTPUT LEADS BY A BATTERY TO BE CHARGED EXCEEDS A PREASSIGNED THRESHOLD.