Frequency responsive control device

Claim 1

A FREQUENCY RESPONSIVE CIRCUIT FOR RESPONDING TO THE FREQUENCY OF AN ALTERNATING CURRENT LINE, SAID CIRCUIT COMPRISING A SATURABLE REACTOR HAVING INPUT AND OUTPUT WINDINGS, MEANS FOR APPLYING A SUBSTANTIALLY CONSTANT DIRECT CURRENT VOLTAGE TO SAID INPUT WINDING, SEMICONDUCTOR SWITCHING MEANS FOR CONTROLLING THE DIRECTION OF CURRENT FLOW IN THE INPUT WINDING, MANS FOR OBTAINING SUBSTANTIALLY CONSTANT CONTROL VOLTAGES FROM SAID LINE FOR CONTROLLING THE SEMICONDUCTOR SWITCHING MEANS, SAID SEMICONDUCTOR MEANS BEING CONTROLLED SOLELY IN RESPONSE TO THE POLARITY OF THE ALTERNATING CURRENT LINE TO EFFECT REVERSAL OF SAID CURRENT FLOW EVERY HALF-CYCLE OF THE ALTERNATING CURRENT VOLTAGE, WHEREBY THE CURRENT FLOW IN SAID INPUT WINDING IS SUBSTANTIALLY CONSTANT AND IS REVERSED AT A RATE EQUAL TO THE FREQUENCY OF THE ALTERNATING CURRENT LINE, MEANS FOR DERIVING AN OUTPUT VOLTAGE EQUAL TO THE HALF-WAVE AVERAGE VOLTAGE OF THE OUTPUT WINDING, AND CONTROL MEANS RESPONSIVE TO SAID OUTPUT VOLTAGE.