Electrical control apparatus

Claim 1

A REGULATING SYSTEM FOR A DYNAMOELECTRIC MACHINE HAVING A FIELD WINDING AND DISPOSED TO PRODUCE AN ELECTRICAL POTENTIAL AT OUTPUT TERMINALS, COMPRISING ERROR DETECTING MEANS CONNECTED TO RECEIVE A MEASURE OF THE OUTPUT POTENTIAL OF SAID DYNAMOELECTRIC MACHINE; SAID ERROR DETECTING MEANS PRODUCING AN ERROR SIGNAL RESPONSIVE TO A DEVIATION OF THE OUTPUT POTENTIAL OF SAID DYNAMOELECTRIC MACHINE FROM A PREDETERMINED MAGNITUDE; A PLURALITY OF TRANSISTORS EACH HAVING EMITTER, COLLECTOR, AND BASE ELECTRODES; AT LEAST TWO OF SAID PLURALITY OF TRANSISTORS BEING CONNECTED IN PARALLEL CIRCUIT RELATION, WITH THEIR EMITTER ELECTRODES CONNECTED TOGETHER, THEIR BASE ELECTRODES CONNECTED TOGETHER, AND THEIR COLLECTOR ELECTRODES CONNECTED TOGETHER; IMPEDANCE MEANS HAVING FIRST AND SECOND TERMINALS; THE EMITTER-COLLECTOR CIRCUIT OF SAID PARALLEL CONNECTED TRANSISTORS, SAID IMPEDANCE MEANS, AND SAID FIELD WINDING BEING CONNECTED IN SERIES CIRCUIT RELATION, WITH THE SECOND TERMINAL OF SAID IMPEDANCE MEANS BEING CONNECTED TO THE COLLECTOR ELECTRODES OF SAID PARALLEL CONNECTED TRANSISTORS; ONE OF SAID PLURALITY OF TRANSISTORS SUPPLYING BASE DRIVE CURRENT FOR SAID PARALLEL CONNECTED TRANSISTORS, WITH ITS EMITTER ELECTRODE BEING CONNECTED TO THE BASE ELECTRODES OF SAID PARALLEL CONNECTED TRANSISTORS, AND ITS COLLECTOR ELECTRODE BEING CONNECTED TO THE FIRST TERMINAL OF SAID IMPEDANCE MEANS; THE VOLTAGE DROP ACROSS SAID IMPEDANCE MEANS PROVIDING COLLECTOR-EMITTER VOLTAGE FOR SAID DRIVING TRANSISTOR TO AID SAID DRIVING TRANSISTOR IN PROVIDING BASE DRIVE CURRENT FOR SAID PARALLEL CONNECTED TRANSISTORS; MEANS CONNECTING SAID DRIVING TRANSISTOR WITH SAID ERROR DETECTING MEANS, WITH THE BASE DRIVE CURRENT SUPPLIED BY SAID DRIVING TRANSISTOR TO SAID PARALLEL CONNECTED TRANSISTORS BEING RESPONSIVE TO THE ERROR SIGNAL FRAME SAID ERROR DETECTING MEANS; THE IMPEDANCE OF SAID PARALLEL CONNECTED TRANSISTORS BEING RESPONSIVE TO THE MAGNITUDE OF THE BASE DRIVE CURRENT SUPPLIED BY SAID DRIVER TRANSISTOR TO CONTROL THE MAGNITDE OF CURRENT FLOWING THROUGH SAID FIELD WINDING AND MAINTAIN THE OUTPUT POTENTIAL OF SAID DYNAMOELECTRIC MACHINE AT A PREDETERMINED MAGNITUDE.