Comparison between three phase rectifiers

In this post, the comparison between three phase half wave rectifiers, three phase full wave rectifiers and six phase half wave rectifiers is given. Here, some of the advantages and disadvantages of the three-phase rectifier over single phase rectifier is given.

Advantages of single-phase rectifiers

The single phase rectifiers are generally used for low power applications of electronic circuits.
They are used for supplying DC loads up to 5 kW. However, the single-phase rectifier circuit have following disadvantages.

Disadvantages of single-phase rectifiers

Low output voltage and current
Low frequency harmonic ripple current
Low efficiency
Very large filter is requiring to obtain smooth output DC voltage

The three phase rectifiers mitigated most of these disadvantages.

Compare three phase half wave rectifiers, three phase full wave rectifiers and six phase half wave rectifiers.

The three phase rectifier does not only supply high power but also produces less ripple in the output voltage and current as compared to single phase rectifiers. The efficiency of the three phase rectifiers is very high as compared to single phase rectifiers.

Parameters	Three phase half waver rectifiers	Three phase full wave rectifiers	Six phase half wave rectifiers
Number of diodes	3	6	6
Conduction period of each diode	120^o	120^o	60^o
Average current	I_dc / 3	I_dc / 3	I_dc / 6
Average voltage	0.827V_m 1.17V	0.955V_m 2.34V	0.955V_m 1.35V
Peak inverse voltage ( PIV )	√3 V_m 2.09V_dc	√3 V_m 1.05V_dc	2 V_m 2.09V_dc
Ripple frequency	3f	3f	6f
Ripple factor	0.17	0.04	0.04
Efficiency	97%	99.87%	99.87%
Core saturation of transformer	Yes	No	No