Battery charging system with alternate control

Claim 1

A BATTERY CHARGING SYSTEM FOR USE WITH AN ALTERNATOR GENERATOR HAVING FIELD AND POWER OUTPUT WINDINGS, WHEREIN A STORAGE BATTERY IS CONNECTED TO SAID POWER WINDING FOR CHARGING THE BATTERY, COMPRISING A TRANSISTOR CONNECTED BETWEEN THE BATTERY AND THE GENERATOR FIELD WINDING FOR BOTH INITIAL AND CYCLIC ENERGIZATION OF THE FIELD WINDING FROM THE BATTERY, AUXILIARY CLOSED LOOP CIRCUITRY RESPONSIVE JOINTLY TO POWER WINDING VOLTAGE AND THE BATTERY VOLTAGE FOR CONTROLLING THE CONDUCTIVE STATE OF THE TRANSISTOR, A MAGNETIC AMPLIFIER HAVING A CONTROL WINDING CONNECTED THROUGH A ZENER DIODE TO THE BATTERY, AND A GATE WINDING CONNECTED BETWEEN THE FIELD AND POWER WINDINGS, SAID DIODE BECOMING CONDUCTIVE WHEN SUBJECTED TO AUXILIARY CLOSED LOOP CIRCUITRY POTENTIAL CORRESPONDING TO A BATTERY VOLTAGE REFERENCE FOR ENERGIZING SAID CONTROL WINDING FROM THE BATTERY, THEREBY DECREASING THE GATED FIELD CURRENT AND CAUSING DROP IN POWER VOLTAGE, SAID AUXILIARY CLOSED LOOP CIRCUITRY BEING RESPONSIVE TO SAID VOLTAGE DROP FOR BIASING THE TRANSISTOR TO CONDUCTING STATE AND ENERGIZING THE FIELD FROM THE BATTERY, THEREBY INCREASING THE POWER VOLTAGE, SAID TRANSISTOR BEING BIASED TO CUT-OFF FOR ISOLATING THE BATTERY FROM THE FIELD WHEN THE POWER VOLTAGE EXCEEDS BATTERY VOLTAGE, THE ZENER DIODE AGAIN BECOMING CONDUCTIVE IN RESPONSE TO THE AFORESAID REFERENCE VOLTAGE FOR CONTROLLING POWER EXCITATION OF THE FIELD TO REPEAT THE CYCLE.