Battery charger with low current cutoff

Claim 1

AN APPARATUS FOR PROVIDING A CONTROLLED CHANGING CURRENT TO A BATTERY COMPRISING THE COMBINATION OF: INPUT CIRCUIT MEANS CONNECTABLE TO A SOURCE OF ALTERNATING CURRENT; RECTIFIER CIRCUIT MEANS CONNECTED TO SAID INPUT CIRCUIT MEANS AND HAVING A DC OUTPUT TERMINAL FOR PROVIDING RECTIFIED CURRENT AT SAID OUTPUT TERMINAL; A BATTERY TO BE CHARGED; A FIRST TRANSISTOR HAVING BASE, EMITTER AND COLLECTOR ELECTRODES, THE EMITTER-COLLECTOR CIRCUIT OF SAID FIRST TRANSISTOR BEING CONNECTED IN SERIES CIRCUIT RELATIONSHIP BEBETWEEN SAID DC OUTPUT TERMINAL AND SAID BATTERY; A FIRST VOLTAGE DIVIDER CIRCUIT CONNECTED IN PARALLEL CIRCUIT RELATIONSHIP WITH SAID BATTERY; A SECOND VOLTAGE DIVIDER CIRCUIT CONNECTED IN PARALLEL CIRCUIT RELATIONSHIP WITH SAID BATTERY; A SECOND TRANSISTOR HAVING BASE, EMITTER, AND COLLECTOR ELECTRODES, THE BASE-EMITTER CIRCUIT OF SAID SECOND TRANSISTOR BEING CONNECTED BETWEEN AN INTERMEDIATE POINT ON SAID FIRST VOLTAGE DIVIDER CIRCUIT AND AN INTERMEDIATE POINT ON SAID SECOND VOLTAGE DIVIDER CIRCUIT; FIRST CIRCUIT MEANS INTERCONNECTING SAID COLLECTOR ELECTRODE OF SAID SECOND TRANSISTOR AND SAID BASE ELECTRODE OF SAID SECOND TRANSISTOR, SAID SECOND TRANSISTOR AND SAID FIRST CIRCUIT MEANS BEING RESPONSIVE TO INCREASING BATTERY TERMINAL VOLTAGE AS DIVIDED BY SAID FIRST AND SECOND VOLTAGE DIVIDER CIRCUITS TO CONTROL THE CONDUCTIVITY OF SAID FIRST TRANSISTOR AND TO DIMINISH CHANGING CURRENT TO SAID BATTERY TO A PRESELECTED LOW LEVEL; A THIRD TRANSISTOR HAVING BASE, EMITTER AND COLLECTOR ELECTRODES; AND SECOND CIRCUIT MEANS INCLUDING SAID THIRD TRANSISTOR CONNECTED BETWEEN SAID DC OUTPUT TERMINAL AND SAID SECOND VOLTAGE DIVIDER, SAID SECOND CIRCUIT MEANS BEING RESPONSIVE TO CHARGING CURRENT FLOW AT SAID PRESELECTED LOW LEVEL TO RENDER SAID FIRST TRANSISTOR NONCONDUCTIVE.

Claim 2

AN APPARATUS FOR PROVIDING A CONTROLLED CHANGING CURRENT TO A BATTERY COMPRISING THE COMBINATION OF: INPUT CIRCUIT MEANS CONNECTABLE TO A SOURCE OF ALTERNATING CURRENT; RECTIFIER CIRCUIT MEANS CONNECTED TO SAID INPUT CIRCUIT MEANS AND HAVING A DC OUTPUT TERMINAL FOR PROVIDING RECTIFIED CURRENT AT SAID OUTPUT TERMINAL; A BATTERY TO BE CHARGED; A FIRST TRANSISTOR HAVING BASE, EMITTER AND COLLECTOR ELECTRODES, THE EMITTER-COLLECTOR CIRCUIT OF SAID FIRST TRANSISTOR BEING CONNECTED IN SERIES CIRCUIT RELATIONSHIP BEBETWEEN SAID DC OUTPUT TERMINAL AND SAID BATTERY; A FIRST VOLTAGE DIVIDER CIRCUIT CONNECTED IN PARALLEL CIRCUIT RELATIONSHIP WITH SAID BATTERY; A SECOND VOLTAGE DIVIDER CIRCUIT CONNECTED IN PARALLEL CIRCUIT RELATIONSHIP WITH SAID BATTERY; A SECOND TRANSISTOR HAVING BASE, EMITTER, AND COLLECTOR ELECTRODES, THE BASE-EMITTER CIRCUIT OF SAID SECOND TRANSISTOR BEING CONNECTED BETWEEN AN INTERMEDIATE POINT ON SAID FIRST VOLTAGE DIVIDER CIRCUIT AND AN INTERMEDIATE POINT ON SAID SECOND VOLTAGE DIVIDER CIRCUIT; FIRST CIRCUIT MEANS INTERCONNECTING SAID COLLECTOR ELECTRODE OF SAID SECOND TRANSISTOR AND SAID BASE ELECTRODE OF SAID SECOND TRANSISTOR, SAID SECOND TRANSISTOR AND SAID FIRST CIRCUIT MEANS BEING RESPONSIVE TO INCREASING BATTERY TERMINAL VOLTAGE AS DIVIDED BY SAID FIRST AND SECOND VOLTAGE DIVIDER CIRCUITS TO CONTROL THE CONDUCTIVITY OF SAID FIRST TRANSISTOR AND TO DIMINISH CHANGING CURRENT TO SAID BATTERY TO A PRESELECTED LOW LEVEL; A THIRD TRANSISTOR HAVING BASE, EMITTER AND COLLECTOR ELECTRODES; AND SECOND CIRCUIT MEANS INCLUDING SAID THIRD TRANSISTOR CONNECTED BETWEEN SAID DC OUTPUT TERMINAL AND SAID SECOND VOLTAGE DIVIDER, SAID SECOND CIRCUIT MEANS BEING RESPONSIVE TO CHARGING CURRENT FLOW AT SAID PRESELECTED LOW LEVEL TO RENDER SAID FIRST TRANSISTOR NONCONDUCTIVE.