How to calculate maximum power output of a ferrite core?

[shatruddha]

Hi
I recently received a ferrite core with following specifications :
ETD44 , 3c90 (material)
Now I want to know how much power can I transfer using this core.
On doing a bit of googling I found this https://www.ferroxcube.com/prod/assets/sfappl.pdf which provides a beautiful table to list the power at 100khz. But what if I want to use it at 200khz. HOw do i calculate output power for that cause.

 

[ysba]

Re: How to calculate maximum power output of a ferrite core

Using the Ampere's law, you can get the following equation:

E = Ae² * B² / (2 * AL)

E: energy stored in the magnetic field
Ae: core's effective area
B: maximum flux density allowed by the core material
AL: core parameter, depends on Ae, magnetic circuit lenght and air gap lenght

You see, power (P) is enery by time. More energe and less time will result in a higher power.

P = E / t

The input power at the inductor is the energy stored (E) divided by ton. Ton is the duty cycle (D) divided by the switching frequency (fsw).

P = E / ton = E * fsw / D

This is an aproximate way to determine how much power you can obtain from a certain core. Actually there are losses by eddie currents, joule effect and stray flux.