Project 1 - Loss calculation for a DC/DC converter-MATLAB

Ev refresher batch5

answer :-

DC-DC converter buck

DC-DC converters are also known as Choppers. Here we will have a look at the Step-Down Chopper or Buck converter which reduces the input DC voltage to a specified DC output voltage.

The input voltage source is connected to a controllable solid state device which operates as a switch. The solid-state device can be a power MOSFET or IGBT. Thyristors are not used generally for DC-DC converters because to turn off a Thyristor in a DC-DC circuit requires another commutation which involves using another THYRISTOR, whereas Power MOSFET and IGBT can be turned off by simply having the voltage between the GATE and SOURCE terminals of a Power MOSFET, or, the GATE and COLLECTOR terminals of the IGBT go to zero.

the power loss calculation for the model are

Econduction = 1/3 ((imin )^2+ Ipeak * Imin + (peak^2) *Rdon)x Ton

P = Econduction * fsw

Fsw=20kHz

Imin = 1.25

Imax =3.2

Rdon = 0.1

Econduction=1/3 (1.562+4+10.24)*0.1*25.414*10^-6 ---------------->13.386*10^-6

P = Econduction *fsw

Ploss----------------------->0.2

hence the efficiency that came out to be can be calculated by the formula

Vout-----20

Iout-------------2.5

efficiency= Vout*Iout/Vout*Iout+Ploss

(20*2.5)/20*2.5+0.2

efficiency= 98%

hence the efficiency came out to be around 98%