This might be a too general question, but:
In power electronics applications (such as DC-DC converters and such) and for switching frequencies of "a few hundred KHz", in general which one has lower core losses as a core of a power inductor (say for example an output filter inductor) : a "ferrite core" or a " powder core" ?
or is there any new material that can outperform those materials in terms of core losses (that can also handle power levels from a few kW to a few tens of kW)?
Thanks!
ARTICLES YOU MAY BE INTERESTED IN,
If you are working in the feild of Ferrites
https://www.researchgate.net/publication/329554668_Multilevel_resistive_and_magnetization_switching_in_CuCoFe2O4Pt_device_Coexistence_of_ionic_and_metallic_conducting_filaments
https://www.researchgate.net/publication/323141836_Electroforming_Free_Controlled_Bipolar_Resistive_Switching_in_AlCoFe2O4FTO_device_with_Self-Compliance_Effect
:-) !
For powers of few kW or tens of kW - I would not suggest to use frequencies higher than 100kHZ, 150kHZ maximum.
You have to look in to physics of soft magnetic materials. The idea of using magnetic material, is to store the "magnetic energy" . And it is stored by aligning magnetic domains inside the material. Now imagine "slapping" them a few hundred times a second. Any material will heat at that rate. Also please don't forget about eddy currents, than higher resistance of the material, then lower losses you have. It is always a great compromise, when you choosing your magnetic material. But in terms of losses, ferrites are best, second are powders, third metal alloys. Ferrites are for the high frequency, powders medium, alloys low.
And still, the best performance you get at frequencies of 100kHZ and below, because above that - losses increase exponentially. The "golden standard" I call 85kHZ :-) the most efficient frequency for high power (above 2kW) SMPS
The best cores for high frequencies are the ferrite cores because ferrites are electrically insulating. Therefore there will be no eddy current in the core. The frequency is limited by the magnetization losses.
Ferroelectric based cores whether laminated or powder will still have eddy current losses but very suppressed. So, they normally used at lower frequencies.
As an advice you can survey the commertial coils that satisfy your requirements and specifications.
Best wishes