Boost Converter - Power dissipation IGBT switch

[badboy85]

Hello guys i have a question for you.... how can i calculate the correct power dissipation of the IGBT switch in a boost converter (consider Vin max 40V e Imax 6A) ? Is right considering it about the same as the Pout? Please help me :| thank you

 

[juicedry]

Are you trying to calculate the power losses in the IGBT switch itself? If so split it into these two parts:

1. Switching losses (Psw)
2. Conduction power loss (Pon)

The switching losses can be estimated as:

Psw = 0.5 x Vce x Ice x (tr + tf) x Fsw

Vce = measured voltage across switch in off state
Ice = measured peak current across switch when turning on
tr + tf = measured gate rise and fall times in your circuit
Fsw = switching frequency

The conduction losses during switch on state can be estimated as:

Pon = Ice x Vce(on)

Vce(on) = max collector-to-emitter saturation voltage at highest temperature.

 

[badboy85]

Thanks a lot. Can you also tell me the right equations for the power losses in the diode?

 

[iepower]

Vinmax=40V,Imax=6A, I think the MOSFET is better than IGBT bacause MOSFET have fast speed and very low Rds(on), and not need complex driver IC.