Working principle of three-phase rectifier circuit

Three-phase AC power supply is transformed through a three-phase transformer connected in a star shape on the secondary side, and then connected to terminals A, B and C of a three-phase bridge circuit. The six diodes in the figure are divided into two groups. The first group VD 1, VD3 and VD5 are connected to the negative (negative) pole, and the second group VD2, VD4 and VD6 are connected to the positive (positive) pole. The three diodes in each group are turned on in turn. * * * In the negative electrode group, the diode with the highest positive potential is turned on; * * * In the positive group, the diode with the lowest negative potential is turned on. At the same time, only one diode in each group is conductive, and the others are not conductive.