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Steve Taranovich

Discussion regarding high switching frequency leading to smaller magnetics in Power designs

Steve Taranovich
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RituGupta
RituGupta
7/11/2018 3:59:32 AM
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Newbie
Re: Sam Yaakov's LLC youtube video
Sometimes not every single perception is concrete but it could be with further probe on its foundation. There needs to be a baseline to fall back on to see if what is being laid out can be relied upon or even trusted to begin with. Without much info, the entire idea needs to be dropped eventually to prevent further misunderstanding on the topic to an even bigger group of enthusiasts.

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sby
sby
4/15/2018 9:09:41 AM
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Teacher
Re: Sam Yaakov's LLC youtube video
Thanks Steve and MrPWM.

No question that in the race for higher and higher operating frequency of power processing systems, the magntics is faltering behind. Furthermore, magnetic material manufacturers are slow in catching up even with the materials they already have. For example: core losses of an inductor are a function of not only the magnetic flux deviation but also of the  DC operating point. And yet, vendors provide loss data only for the zero DC case. I wonder how we, the customers, can give the core manufactures a wakeup call. 

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MrPWM
MrPWM
4/14/2018 4:09:55 PM
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Newbie
Sam Yaakov's LLC youtube video
This was excellent Sam. A very good tutorial for sizing the transformer for an LLC converter.
https://youtu.be/P-p4bk0rYzw

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steve.taranovich
steve.taranovich
4/14/2018 2:37:36 PM
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Re: Bio
Hi Sam,

I am sorry to hear about Green Power Technologies---we need good technology efforts in the renewable sector---especially when waste can be part of the solution.

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steve.taranovich
steve.taranovich
4/14/2018 2:28:08 PM
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Re: Bio
Hi Sam,

Thank you for that latest bio update---I am sorry about the older bio, but it was the latest one I could find online. I did not think about Linkedin because so many people do not update their bio there

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sby
sby
4/14/2018 9:24:54 AM
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Teacher
Bio
Hi Steve, 

Thanks for the introduction. However, this short bio is very old. A more recent one can be found at: 

https://www.linkedin.com/in/ben-yaakov-shmuel-sam-49094422/

AS for Green Power Technologies , in a nutshell:

Great idea-> patents-> startup-> investments > bad decisions by investors->

litigations->end

Sam

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steve.taranovich
steve.taranovich
4/13/2018 12:36:56 PM
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Blogger
Re: So which is it?
Just for our audience information 'sby' is an esteemed member of our electronics industry:

 

Prof. Sam Ben-Yaakov is the Chief Scientist Officer, Director, and co-founder of Green Power Technologies Ltd. He brings to the Company his entrepreneurial experience in theoretical and practical Power Electronics and analog electronic circuits and systems. Prof. Sam Ben-Yaakov serves as a professor and a researcher in the Department of Electrical and Computer Engineering, Ben-Gurion University, Israel. For several years Prof. Ben-Yaakov served as the Chairman and Head of Institute of Electronics of the Ben-Gurion University. In addition he is a well-known consultant to many companies worldwide.

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sby
sby
4/13/2018 4:52:54 AM
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Teacher
Re: So which is it?
The moral of Feucht's comment, to which I totally agree, is simple: You need to know how to read Ferrite material datasheets. When applied correctly, higher frequency Ferrites will lead to samller size magnetics.

Sam 

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D Feucht
D Feucht
4/12/2018 7:59:01 PM
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Blogger
Re: So which is it?
A few comments in response to

"Furthermore, the size and cost of the magnetic core goes down as the frequency increases. All of these cost, efficiency and density benefits have been demonstrated by Navitas and many of their partners in the frequency range of 500 kHz to 1.5 MHz."

which refutes Cuk's claims.

As the magnetic frequency is increased, the ΔB driving the core must be reduced because power-loss density in the core, which has a maximum set by thermal design formulas, would otherwise increase. Yet the power transfer rises in proportion to the frequency. The frequency at which ΔB decreases more than frequency increases is the maximum design frequency for the core. A further increase in frequency causes ΔB to decrease superlinearly and power transfer actually decreases. It is above this fMAX that Cuk is right. However, below it, power transfer increases with frequency. (The actual derivations for fMAX are in my book, PMDO in the section "Frequency Optimization", p. 255.) So Cuk is right above fMAX and presumably wrong below it.

If one asks what the typical fMAX is for higher-performing core materials, it is in the GaN, SiC range given by Navitas, et. al., and the faster switching speed can be put to good use increasing transfer-power density in converters.

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sby
sby
4/12/2018 5:07:03 AM
User Rank
Teacher
So which is it?
Hi Steve, Thanks for referencing the article:

"High-Frequency Magnetics: Lower cost, smaller size <b<and higher efficiency? <b<Really?!? "

On the one hand, the title suggests that "none of the above" but then the author writes:

"Furthermore, the size and cost of the magnetic core goes down as the frequency increases. All of these cost, efficiency and density benefits have been demonstrated by Navitas and many of their partners in the frequency range of 500 kHz to 1.5 MHz."

which refutes Cuk's claims.

Sam

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