Re: Is this ~150W 12V dc-dc supply realistic?


"MrPerfectionest" <mrperfectionest@xxxxxxxxx> wrote in message
news:1112278046.616592.216350@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> A guy on mp3car.com is offering up a very compact 12V supply and I am
> wondering if the claims he is making are legit. I had contemplated a
> similar supply myself but my knowledge was limited to boost / buck
> configurations and the high cost of low esr caps to manage output
> ripple kept me from taking the idea to fruition. Did I severely
> underestimate the power of a full/half bridge or forward converter
> setup? He is being mum on what the topology is but from the looks of
> it, it appears full bridge to me. What he has posted about it:

I don't think this is a half/full bridge or forward converter. All three of
those types of converters typically employ at least two magnetic devices
(one transformer and at least one inductor). This device only appears to
have one magnetic device (which appears to only have 2 wires on it, so only
a simple inductor, although that isn't 100% guaranteed given the low
resolution of the images). Additionally a full bridge takes more than four
semiconductor power devices (four MOSFETs + typically two output
rectifiers), but the board only appears to have four on it.

Exactly what topology this is isn't fully clear to me given the resolution
of the images.

However, given the modern design approach that appears to employ synchronous
rectifiers, the output power and size specifications are quite possibly
realistic. The efficiency claim seems awfully high, but on the other hand
not totally unrealistic using synchronous rectifiers and modern MOSFETs.

It looks legit to me.


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