Introduction

Here, the 3 – Phase Diode Rectifier and the DC – DC converter circuits have to be designed using the Multisim software.  Their performance is also evaluated.

Methodology

While designing a power electronic converter , the main concern is the enhancement of efficiency.

The 3 – phase rectification circuits find applications in the industry like for motor control or to change battery. The 3 phase supply is converted into a DC output which is constant. Here, 2 diodes are used for each phase. It gives very less ripples in the output. In the 3 phase, full bridge rectifier , the power handling capacity is large and the ripples present in the output are very less which makes it useful for industrial applications. Every diode present in the circuit conducts for 120 degree.

A DC – DC converter can be designed using a power diode in parallel with a power transistor like IGBT. A driver circuit is also needed to generate the pulses. This type of boost converter can step up the input voltage to a larger value. The parallel connection ensures that conduction losses as well as the thermal losses are reduced but the switching losses increase.

Results, Analysis and Discussion 

Task 1 :

3 – Phase Diode Rectifier

• The values obtained on simulation are as follows :

Va = 0.022 V

. ia = 4.201 uA

Vab = 0 V

Vd = – 1.575 pV

. id = -0.055 uA

(2) Fourier Analysis = ia2/ia1 = 0.1

(3) % THD = 10 %

(4) Icap = 6.942 nA

(5) If the value of Ld increases, then the input displacement factor also increases.  

Task 2 :

DC – DC Converter

• In steady state ,
• VL = – 0.464 uV

. iL = – 3.549 nA + 0.059 uA = 55.451 nA

• Vo = -0.022 uV

. iC = – 3.549 nA

(2) Vo1 / Vo = 0.1

(3) If load resistance = 10 Ohm, then VL = 0 V and iL = 0 A is obtained on simulation.

(4) Peak to peak ripple = 25 %

(5) Ic =  – 3.549 nA

(6) If ESR = 100 m Ohm. Ripple ( p – p ) = 0.8 V

Conclusions 

Hence, the 3 – Phase Diode Rectifier and the DC – DC converter circuits have been successfully designed using the Multisim software.  

References 

Tripathi, A.K., Mainali, K., Patel, D.C., Kadavelugu, A., Hazra, S., Bhattacharya, S. and Hatua, K., 2015. Design considerations of a 15-kV SiC IGBT-based medium-voltage high-frequency isolated DC–DC converter. IEEE Transactions on Industry applications, 51(4), pp.3284-3294.

Zare, F., Soltani, H., Kumar, D., Davari, P., Delpino, H.A.M. and Blaabjerg, F., 2017. Harmonic emissions of three-phase diode rectifiers in distribution networks. Ieee Access, 5, pp.2819-2833.