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.