Double auctioneering control circuit

Claim 1

A REGULATOR SYSTEM FOR MAINTAINING AT SUBSTANTIALLY A PREDETERMINED VALVE THE OUTPUT VOLTAGE OF A DYNAMOELECTRIC MACHINE HAVING OUTPUT TERMINALS AND AN EXCITATION FIELD WINDING COMPRISING, FIRST MEANS FOR OBTAINING AN ERROR SIGNAL WHICH VARIES WITH THE DEVIATION OF SAID OUTPUT VOLTAGE FROM SAID PREDETERMINED VALUE, SECOND MEANS COMPRISING MAGNETIC AMPLIFIER MEANS CONNECTED IN CIRCUIT RELATION BETWEEN SAID FIRST MEANS AND SAID FIELD WINDING FOR CONTROLLING THE EXCITATION CURRENT SUPPLIED THERETO IN ACCORDANCE WITH THE NET SUM OF CONTROL SIGNALS APPLIED TO SAID MAGNETIC AMPLIFIER MEANS, THIRD MEANS CONNECTED IN CIRCUIT RELATION BETWEEN SAID OUTPUT TERMINALS AND SAID MAGNETIC AMPLIFIER MEANS FOR APPLYING A FIRST LIMITING SIGNAL TO SAID MAGNETIC AMPLIFIER MEANS, FOURTH MEANS CONNECTED TO CIRCUIT RELATION BETWEEN SAID OUTPUT TERMINALS AND SAID MAGNETIC AMPLIFIER MEANS FOR APPLYING A SECOND LIMITING SIGNAL TO SAID MAGNERIC AMPLIFIER MEANS, FIFTH MEANS CONNECTED IN CIRCUIT RELATION WITH SAID MAGNETIC AMPLIFIER MEANS FOR APPLYING THERETO THE DIFFERENCE BETWEEN SAID ERROR SIGNAL AND FIRST LIMITING SIGNAL, AND SIXTH MEANS CONNECTED IN CIRCUIT RELATION WITH SAID MAGNETIC AMPLIFIER MEANS FOR APPLYING THERETO THE DIFFERENCE BETWEEN SAID ERROR SIGNALS AND SAID SECOND LIMITING SIGNAL, THE OUTPUT OF SAID MAGNETIC AMPLIFIER MEANS VARYING WITH THE ERROR SIGNAL BETWEEN UPPER AND LOWER LIMITS, SAID UPPER AND LOWER LIMITS BEING DETERMINED BY THE MAGNITUDES OF SAID FIRST AND SECOND LIMITING SIGNALS, THE OUTPUT OF SAID MAGNETIC AMPLIFIER RESPONSIVE TO SAID UPPER LIMIT WHEN SAID ERROR SIGNAL EXCEEDS SAID UPPER LIMIT, AND THE OUTPUT OF SAID MAGNETIC AMPLIFIER RESPONSIVE TO SAID LOWER LIMIT WHEN SAID ERROR SIGNAL IS LESS THAN SAID LOWER LIMIT.