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Pspice Buck Chopper Simulation

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Arif Syazwan

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I have done a buck circuit using Pspice but i have some problem with the Voltage,power and current Output.
buck.JPG

By calculation i should get 60V and 4kW for the output

Vo = 60V
Vin = 339.4V

Duty cycle,
T =50us
F = 20k
D= 60/339.4
=0.178

DT = 60/(339.4 ) x 50us
= 8.9us


Output Current,

Iout = Pout/Vout
= = 4000/60
= 66.667A

Resistance,
R =Vout/Iout =60/66.667
= 0.8999 Ω


but in simulation i get:
Average Voutput = 49.4V
Average Power = 2.67kW

Average power:
pbuck.JPG

Average Voltage:
vbuck.JPG

Seem way off from the calculation..
Im try to figure what to do, so,i can get the nearest value with the calculation. I hope someone can help me with my problem.
 

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Unsuitable diode, possibly hidden switch resistance.

1. You didn't think when selecting the components.
2. You didn't use the features of Spice to check yourself where the voltage drop occurs.
 

I try to find a suitable diode but i did not find one in pspice..

you must also ensure that the reverse-repetitive maximum voltage is greater than the maximum input voltage (VRRM >VINMAX). The diode’s
forward-current specifi cation must meet or exceed the maximum output current (i.e.,IFAV> IOUTMAX).
Click to expand...
 

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