Power supply for developing a regulated direct current signal from a three-phase supply

Claim 1

A POWER SUPPLY FOR DEVELOPING A REGULATED DIRECT CURRENT SIGNAL FROM A SOURCE OF UNREGULATED THREE-PHASE ALTERNATING CURRENT SIGNALS COMPRISING, A TRANSFORMER INCLUDING A THREE-PHASE PRIMARY WINDING ARRANGEMENT COUPLED TO THE SOURCE, A FIRST THREE-PHASE SECONDARY WINDING ARRANGEMENT ASSOCIATED WITH THE PRIMARY WINDING ARRANGEMENT AND HAVING A REFERENCE TERMINAL DEFINING ONE OUTPUT TERMINAL FOR THE POWER SUPPLY, A SECOND THREEPHASE SECONDARY WINDING ARRANGEMENT ASSOCIATED WITH THE PRIMARY WINDING ARRANGEMENT AND HAVING A REFERENCE TERMINAL FOR RECEIVING A SIGNAL TO CONTROL THE DIRECT CURRENT LEVEL OF CURRENT SIGNALS DEVELOPED IN THE WINDINGS OF THE SECOND THREE-PHASE SECONDARY WINDING ARRANGEMENT, A PLURALITY OF NORMALLY OPEN ELECTRICAL SWITCHING DEVICES EACH BEING COUPLED IN SERIES BETWEEN A WINDING OF THE FIRST THREE-PHASE SECONDARY WINDING ARRANGEMENT AND A COMMON TERMINAL DEFINING A SECOND OUTPUT TERMINAL FOR THE POWER SUPPLY, EACH SWITCHING DEVICE INCLUDING A CONTROL ELECTRODE FOR CONTROLLING THE CLOSING OF THE SWITCHING DEVICE, MEANS FOR COUPLING EACH CONTROL ELECTRODE TO A WINDING OF THE SECOND THREE-PHASE SECONDARY WINDING ARRANGEMENT, MEANS FOR DEVELOPING A REFERENCE VOLTAGE, MEANS FOR COMPARING THE REFERENCE VOLTAGE WITH AN OUTPUT VOLTAGE DEVELOPED BETWEEN THE OUTPUT TERMINALS TO PRODUCE A SIGNAL PROPORTIONAL TO ANY DIFFERENCE BETWEEN THE REFERENCE VOLTAGE AND THE OUTPUT VOLTAGE, AND MEANS FOR APPLYING THE SIGNAL TO THE REFERENCE TERMINAL OF THE SECOND THREEPHASE SECONDARY WINDING ARRANGEMENT TO CONTROL THE DIRECT CURRENT LEVEL OF CURRENT SIGNALS DEVELOPED IN THE WINDINGS OF THE SECOND THREE-PHASE SECONDARY WINDING ARRANGEMENT THEREBY SIMULTANEOUSLY CONTROLLING THE CLOSING OF EACH SWITCHING DEVICE TO CORRECT FOR ANY VARIATION IN THE OUTPUT VOLTAGE RELATIVE TO THE REFERENCE VOLTAGE.