Project 3

Design and simulation of Buck converter for Auxiliary load in EV.

• Input voltage is 48V, Output voltage is 12 V
• Load current is 10A
• Calculate Duty ratio and Load(use Resistor as Load)
• Calculate L,C

SOLUTION;

DUTY RATIO(D);

Duty Ratio = Output voltage / Input voltage

Duty Ratio = 12/48 = 0.25

Duty Ratio = 25%

INDUCTANCE VALUE(L);

Assume Resistor (R) is 8 Ohm

Assume Frequency (HZ) is 40KHZ

L= (1-D)R\2f

L = (1-0.25)*8/2*40*10^3

= (0.75)*8/80*10^3

=(6)/80000

L = 75

CAPACITANCE MODEL;

C = 1-0.25/8*75*2*40*10*10

C = 0.75/480000

C = 156.25

THESE BLOCKS ARE USED IN MODEL;

• PWM Genertor
• MOSFET Switch
• DC voltage source
• Current Measurement
• RLC
• Voltage MEasurement
• SCope
• Powergui