Unidirectional three phase pulse controlled rectifier system with failed phase voltage operation

摘要

An apparatus for converting a three-phase voltage system to a DC voltage is supported by an output capacitor and a star circuit. On the input side of filter capacitors is a controllable three-phase bridge and at a positive output of the bridge circuit, a current-stabilizing inductance is included, which, in conjunction with a step-up controller diode and a step-up controller transistor, forms a DC voltage/DC voltage step-up controller which is integrated in the converter structure. The phase arms of the three-phase bridge have an identical structure and their conductance state can be controlled by control switches. In order to produce an output voltage from the system which is below the mean value of the maximum output voltage of the bridge circuit, the step-up controller transistor remains in the switched-off state, and a voltage value which is above the maximum output voltage is formed.