Project 2
AIM:-
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,
Vin=45-60v
Vout=3v
Output current=100A
Efficiency>85%
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.
Isolated DC-DC converter:-
this isolation usually achived using magnetic isolation and perticularly using transfomer's
therefore , in this design i am using forward DC-DC convereter.
FORWARD DC-DC CONVERETER:-
Schematic diagram of forward convereter:-
calculations:-
Simulink model of forward converter:-
Input voltage source:-
RLC values:-
Linear transformer:-
Mosfet:-
PWM controll system for both mosfet:
Diode:-
PID/PI controll:-
PWM:-
RESULTS:-
input voltage is 60v
give stop time 0.6 and run
the wave form is shown in below
Input voltage:-
input voltage is constant=60v
Input current:-
Ii(max)=10.55
Ii(min)=-0.45
I=(10.55+(-0.45))/2=5.05A
output voltage
Vo(max)=3.04v
Vo(min)=2.96v
total voltage `V=3.04+2.96/2=3.00v`
output voltage =3.00v
Output current:-
Io(max)=103.9
Io(min)=97.9
103.9+97.9/2=100.9
Output current Io=100.9A
Mosfet current:-
Efficiency?
the main aim is get a good efficiency.
here input power is 300w
output power is=295.1w
so
efficiency=output power/input power
295.1/300=0.9836=98.4%
when input and output power is 300w it will come 100% efficiency