Polyphase rectifier circuit having means to vary the output voltage

Claim 1

IN A DIRECT CURRENT POWER SOURCE, A FIRST POLYPHASE TRANSFORMER SECONDARY, A BANK OF RECTIFIERS CONNECTED TO THE TRANSFORMER SECONDARY AND DEFINING A FIRST OUTPUT MEANS PROVIDING A HALF WAVE RECTIFIED OUTPUT, A SECOND POLYPHASE TRANSFORMER SECONDARY HAVING A PEAK OUTPUT SUBSTANTIALLY GREATER THAN THE FIRST POLYPHASE TRANSFORMER SECONDARY, A SECOND BANK OF RECTIFIERS CONNECTED TO THE SECOND TRANSFORMER SECONDARY AND DEFINING SECOND OUTPUT MEANS PROVIDING A SECOND HALF WAVE RECTIFIED OUTPUT, SAID SECOND BANK OF RECTIFIERS BEING CONNECTED TO PROVIDE A PEAK OUTPUT VOLTAGE SUBSTANTIALLY LESS THAN SAID FIRST BANK RECTIFIERS, A THIRD BANK OF RECTIFIERS CONNECTED TO THE SECOND TRANSFORMER SECONDARY AND DEFINING THIRD OUTPUT MEANS PROVIDING A THIRD HALF WAVE RECTIFIED OUTPUT, SAID THIRD BANK OF RECTIFIERS BEING CONNECTGED TO PROVIDE A PEAK OUTPUT VOLTAGE SUBSTANTIALLY GREATER THAN SAID FIRST BANK OF RECTIFIERS, OUTPUT CONNECTING MEANS, AND CIRCUIT MEANS CONNECTING SAID FIRST, SECOND AND THIRD OUTPUT MEANS IN PARALLEL TO EACH OTHER TO THE OUTPUT CONNECTING MEANS AND INCLUDING A FIRST CONTROLLED RECTIFIER IN SERIES WITH THE FIRST OUTPUT MEANS AND A SECOND CONTROLLED RECTIFIER IN SERIES WITH THE THIRD OUTPUT MEANS.