VHF swiching AC/DC converter

May 16, 2016 9 Replies
A

I just noticed this product:

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which claims to be a 65W laptop power brick (including PFC) that switches at VHF (i.e. over 30MHz).



Whilst switching in this frequency range has been done for years (e.g. on- die by Intel), this is the first time I've noticed it in a standalone AC/ DC converter.



They don't seem to provide efficiency figures, but from the (small) physical size the efficiency would need to be in the mid-90% range to avoid overheating.



This PDF

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says that it uses air cored inductors.



From the FAQ: "meet[s] FCC Part 15 Class B EMI requirements for North America plus all international EMI requirements for a laptop charger"



Regards, Allan


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G

One assumes torroids?

George H.

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J

GaN fets, probably.

John Larkin Highland Technology, Inc lunatic fringe electronics
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P

** LDMOS according to this article:

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.... Phil

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J

We had the epc folks visit and show us their new GaN stuff. Some of the parts are cheap, 60 cents or something. They were pushing 30-50 MHz offline warts, but we're not in that business. They might make nice pulse generators.

John Larkin Highland Technology, Inc lunatic fringe electronics
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A

This article suggests GaN-on-Silicon HeMTs from Transphorm were at least considered:

From that article, I found another manufacturer with similar products:

Regards, Allan

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R

I wonder how they make sure it runs at a frequency where it does not cause radio interference... crystal control?

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P

Key one!

Cheers

Phil Hobbs

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