I meant losses in my dc-dc converter.
Mhh, you are right, 0,5% losses sounds too optimistic.
Using this Sic mosfet C3M0280090D
https://www.wolfspeed.com/media/downloads/825/C3M0280090D.pdfRdson=0,28 ohm, switch losses are 50 uJ per period.
At 2.5A average current:
Conduction losses= 0,28*2,5²=1,75W
Switching losses= 50*0.100=5W (from graph 23)
I hanven't look up a transistor, which was suggested as more efficient than a mosfet. Can it be?
This diode STPSC1006D
https://www.mouser.com/datasheet/2/389/stpsc1006-956763.pdfwould have 3,56W losses at 2.5A
If the inductor has 150 mOhm, dissipates 1W.
13,3 W so far. So, 1.33% losses. I still have to quantify the losses in the gate driver and capacitors.
I could also reduce the switching frequency and increase the inductor to reduce the switching losses.
The whole 7 kW PV inverter has 2-3% losses to do MPPT and AC conversion (according to the datasheet, it is a SMA SMC 7000 TL)
I hope that my simple boost converter can have around 2% losses.
Can I reduce the switching frequency at partial load?