Device for controlling the effective value of an alternating load voltage

Claim 1

A DEVICE FOR CONTROLLING THE EFFECTIVE VALUE OF AN ALTERNATING VOLTAGE APPLIED TO A LOAD, COMPRISING A DIRECT CURRENT SOURCE, AN INVERTER CONNECTED TO SAID SOURCE AND HAVING OUTPUT TERMINALS FOR PROVIDING AN ALTERNATING FEEDER VOLTAGE, A LOAD CIRCUIT CONNECTED TO SAID TERMINALS, A SATURABLE REACTOR HAVING A MAIN WINDING AND A SECOND WINDING, SAID MAIN WINDING BEING SERIES CONNECTED IN SAID LOAD CIRCUIT, SAID SECOND WINDING HAVING TWO EQUAL AND MUTUALLY OPPOSED WINDING HAVING TWO EQUAL SAID DIRECT CURRENT SOURCE, TWO DIODES BEING INTERPOSED BETWEEN EACH WINDING PORTION AND SAID SOURCE AND CONNECTED WITH POLARIES FOR NORMALLY PREVENTING FLOW OF CURRENT FROM SAID SOURCE THROUGH SAID WINDING PORTIONS, A SEMICONDUCTOR SWITCHING HALF-WAVE RECTIFIER HAVING A MAIN PATH PARALLEL C ONNECTED WITH SAID REACTOR MAIN WINDING AND HAVING AN IGNITION CIRCUIT, AND PULSE SUPPLY MEANS IN SAID IGNITION CIRCUIT FOR APPLYING PERIODIC IGNITION PULSES TO SAID RECTIFIER, WHEREBY THE EFFECTIVE VALUE OF THE LOAD VOLTAGE DEPENDS UPON THE PHASE POSITION OF THE IGNITION PULSES RELATIVE TO THE CYCLE OF THE FEEDER VOLTAGE AND SAID DIODIES COMMENCE CONDUCTING TO LIMIT THE LOAD CURRENT WHEN THE VOLTAGE AT SAID RECTIFIER EXCEEDS A GIVEN VALUE.