Project 2

1. 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% (extra credit for efficiency higher than 90% on a spice-based software simulation tool)

Simulate the system using a Spice-based software simulation tool such as LT-Spice, Pspice, PowerSim, TINA, etc...

Show your design in details (most probably, you will need to use an isolated system to achieve this low voltage conversion ratio, you might also need to use a multiphase system to increase the efficiency).

Show the input voltage, the output voltage, the input current, the output current, the system efficiency and any other simulation plots necessary to evaluate your design.

Given Data:

• Input voltage: 45 – 60 v
• Output voltage: 3 V
• Output current: 100A

• Efficiency > 85%

Assume:

fs = 20Khz

D = 0.5

For this design we are using the forward converter formulas:

Duty cycle:

Vout / Vi = D.(N2 / N1)

Let's assume that we will design for 50% Duty ratio:

N2/N1 = 0.1

These we choose the following:

N1 = 500

N2 = 50

Since we choose D = 0.5 then using equation we found that,

Thus we will choose,

N3 = 150turns

Now, we will choose an inductor for 40% current ripple:

Now we are calculate the capacitor:

MODEL:

Gate ckt:

Parameters:

Mosfet current & voltage:

Output:

Conclusion:

Those we designed the DC/DC converter the given data and get the required output with more than 85% efficiency.

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