Contactless alternating current switch with controlled rectifiers of the electronic type

Claim 1

A STATIC ALTERNATING CURRENT SWITCH FOR CONTROLLING THE NEUTRAL POINT OF AN N POLY-PHASE LOAD COMPRISING FIRST TO NTH CONTROLLED RECTIFIERS, EACH OF SAID RECTIFIERS COMPRISING AN ANODE, A CATHODE, AND A CONTROL ELECTRODE, A FIRST TRANSFORMER COMPRISINUG A FIRST PRIMARY AND A FIRST SECONDRY WINDING, SAID FIRST PRIMARY WINDING BEARING CONNECTED BETWEEN THE ANODE OF SAID FIRST OF SAID RECTIFIERS AND THE CATHODE OF A THIRD OF SAID RECTIFIERS, FIRST AND SECOND FORWARD POLED DIODES, THE TERMINALS OF SAID FIRST SECONDARY WINDING BEING CONNECTED THROUGH SAID FIRST AND SECOND DIODES TO THE CONTROL ELECTRODE OF SAID THIRD RECTIFIER, A SECOND TRANSFORMER COMPRISING A SECOND PRIMARY AND A SECOND SECONDARY WINDING, SAID SECOND PRIMARY WINDING BEING CONNECTED BETWEEN THE ANODE OF SAID THIRD RECTIFIER AND THE CATHODE OF A SECOND OF SAID RECTIFIERS, SAID SECOND SECONDARY WINDING BEING IN CIRCUIT WITH THE CONTROL ELECTRODE OF SAID SECOND RECTIFIER, THE ANODE OF SAID SECOND RECTIFIER BEING CONNECTED TO THE CATHODE OF SAID FIRST RECTIFIER, A UNIDIRECTIONAL POTENTIAL SOURCE IN CIRCUIT WITH THE CONTROL ELECTRODE OF SAID FIRST RECTIFIER, THE CATHODES OF SAID FIRST, SECOND AND THIRD RECTIFIERS BEING CONNECTED TO FIRST, SECOND AND THIRD PHASES OF SAID LOAD.