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The output voltage is maintained between 86.6% of the maximum voltage and the peak value of the voltage. The advantage of 3 phase full wave rectifiers is that the output voltage is regulated and do not falls to zero. The output voltage fluctuates between maximum value of peak voltage i.e Vsmax and 86.6% of the maximum voltage. The output DC voltage fluctuations are less in 3 phase full wave rectifiers. In this each diode conducts for 1/6 th part of the AC cycle. It is also called 6-diode half wave rectifier. In three phase full wave rectifier six diodes are used. Due to this smoothing process is very easy in case of three phase rectifier than that of single phase rectifier. The ripple frequency in case of three phase rectifiers is three times of the supply frequency. Thus, due to this these ripples can be easily filtered. Moreover, the frequency of the ripples in three phase rectifier is very high. Thus, it is evident that the value of ripple factor in 3 phase rectifier is very less in comparison to single phase rectifier. In single phase half have rectifier the value of ripple factor is 1.21 and in case of single phase full wave rectifier it is 0.482. It is evident from the above calculations that the ripple factor for the 3 phase half wave rectifier is 0.17 i.e. The ripple factor for 3 phase half wave rectifier is derived in the equations below. The ouput DC voltage will be between the peak value of supply voltage and half of the supply voltage.
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This neutral point provides the negative terminal to the load and is earthed.Įach diodes conducts for one third of the AC cycle and remaining two diodes will remains open circuit. And the three phases of the transformer is connected together at a common point called neutral. The anode terminal of the diode is connected to the secondary winding of the transformer. The three phases of secondary are connected in the form of star thus it is also called Star Connected Secondary. In three phase half wave rectifier, three diodes are connected to each of the three phase of secondary winding of the transformer. One of the significant advantage of three phase transformer is that the rectified voltage do not falls to zero even when no smoothing arrangement is used. Therefore, if in place of single phase transformer we use three phase transformer the ripple factor can be reduced up to a large extent. Thus, the Smoothing circuit is used, filter works as a smoothing circuit for rectifier system.īut after this smoothing process the rectifier voltage falls to zero at some point. If this pulsating DC voltage is used in several applications it lead to poor performance of the device. These ripples are the AC components in the DC voltage. Thus, in such types of arrangement we need smoothing circuit in order to remove these ripples. While in case of half wave rectifier the value is quite large but in full wave rectifier too the value of rectifier is significantly large. In both the cases the value of ripple factor cannot be neglected. In case of half wave rectifier the ripple factor is 1.21 and in case of full wave rectifier the ripple factor is 0.482. The drawback of this arrangement is high ripple factor.