Project 2

PROJECT 02

AIM:-

To design an interleaving DC/DC converter system for a data centre application with the following specifications:

• Input voltage: 45 – 60 v
• Output voltage: 3 V
• Output current: 100A
• Efficiency > 85%

Here we have to design a 300W step down converter which reduced the voltage level from a range

of 45-60V to 3V.

We will use a Isolated converter for Load security and effeciency ( Forward converter )

The forward converter is a DC/DC converter that uses a transformer to increase or decrease the output voltage (depending on the transformer ratio) and provide isolation for the load.

We know, Duty cycle (D)

Np = Primary turns

Ns = Secondary turns

Nt = Teritery turns

Let,s design our forward converter for 50% Duty

=> Vout = 0.5(Ns/Np)Vin
=> Ns/Np = 0.12
Lets choose Ns = 100

=>100/Np = 0.12

=> Np = 833.3

Since we choose D = 50%
=> D<(1-Nt/Np)<1
=> Nt/Np <1
=> so we will choose Nt = 500

Also The load resistance

R = Vout^2/P = 0.03ohm
IL = Vout/R = 100A

We will design the inductor for 20% current ripple

=> Delta(IL) = 0.2*IL = 0.2*100 = 20A

=> L = Vout/(Fs*delta(IL)) = 7.5e-7H

Similerly we will design the capacitor for 5% ripple as

Delta(Vout) = 0.05*Vout = 0.15v

Delta(vout)/Vout = 0.05V

=>C= (1-D)/(8*L*Fs^2(Delta(Vout)/Vout)))

=>C = 4.166e-5f

Now We will build a design for our model in Simulink as

Here we are using a multi phase system of two parallel converters to increase the effeciency.

but if we go beyond five phases the effeciency ill sytill get better but, the cost will also increase.

After running the model in simulink we get the output result as.

Zoomed out

Zoomed in

PWM output

Gate driver

Mosfet used

Transformer used

Diode used

Output power

KINDLY FIND THE ATTACHED FILES BELOW.

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