3 Phase Bridge Rectifier Output Voltage. The rectifier output dc voltage can be expressed by following formula. The conduction sequence for diodes is 12 23 34 45 56 and 61.
The conduction sequence for diodes is 12 23 34 45 56 and 61. Thus a transformer between synchronous generator and rectifier can be avoided. The average value of the pulsating dc voltage is approximately 1 31 to 1 41 times the mains voltage with a three phase supply or approximately 0 9 to 1 2 times the ac voltage in the case of a single phase supply.
The rectifier output dc voltage can be expressed by following formula.
The voltage and the current waveforms of the three phase bridge rectifier are shown in fig. The main reason behind this low fluctuation in output voltage is the usage of large number of diodes. The advantage of 3 phase full wave rectifiers is that the output voltage is regulated and do not falls to zero. Average value of the output voltage is the same as before the inductore.
