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 'Vin' = (45 - 60)V;
Output voltage 'Vo' = 3V;
Output current 'Io' = 100A;
Solution :
To find a duty cycle 'D';
D=> (Vo/Vin) = (D/(1-D))*(N2/N1);
N1 => Input voltage Vin = 60;
N2 => Output voltage Vo = 3;
D=> (3/60)=(D/(1-D))*(3/60);
D=>(3/60)=(D/(1-D))*(0.05);
D=>(3/60*0.5) = (D/(1-D));
D=>(3/3) = (D/(1-D));
D=>(3*(1-D))=3*D;
D=>(3-3D)=3D;
D=>3=3D+3D;
D=>3=6D;
D=(6/3);
D = 0.5;
To find a output power 'Po',
Po = (Vo*Io);
Po = (3*100);
Po = 300W;
To find a output resistance 'Ro',
Ro = (Vo/Io);
Ro = (3/100);
Ro = 0.03 Ohms;
To find a inductance 'L''
L = (Vin/(F*(DeltaIl))*D);
Delta Il = ((Ripple value/100)*Il);
Il = (Po/Vo);
Il = (300/3);
Il = 100A;
Ripple value is assumed 30%'
Delta Il = ((30/100)*100);
Delta Il = 30A;
L = ((60/(50000*30))*0.5);
L = (0.00004*0.5);
L = 0.00002 H;
Here used two forward converter.so L1 and L2 equal.
To find a capacitance 'C',
C = (D/Ro*F*(DeltaVo/Vo));
Delta Vo = (ripple value/100)*Vo;
Assumed ripple value =5%;
Delta Vo = ((5/100)*3);
Delta Vo = 0.15V;
C = (0.5/0.03*50000*(0.15/3));
C = (0.5/0.03*50000*0.05);
C = (0.5/75);
C = 0.0067 F;
Here used two forward converter.so C1 and C2 equal.
To calculate efficiency '%',
Efficiency(%) = (Po/Pin)*100;
Efficiency(%) = 92.27%.
Interleaving DC/DC converter circuit diagram,
Output graph zoom out condection,
Output graph zoom in condection,
