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Thread: Interesting design of the SF Amazon 650W (SF-650P14HE)

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    Default Interesting design of the SF Amazon 650W (SF-650P14HE)

    As per the title, I got to play around with a new iteration of Super Flower's now classic Amazon series (debuted sometime in 2008, so 5 and small change years old).



    At first, I noticed the components were shuffled around straight away, judging from personal experience, as well as some old reviews still floating around. The first two iterations had their main filter cap in the middle, between primary and secondary, much like the old Seasonic S12s did.



    It took me a moment to even notice there was a peculiarly familiar-looking axial X-cap in parallel to the main input cap, but I didn't think much of it. Then I noticed three transformers, an ERL-39, which is obviously the main transformer, and two EEL-19s. Two? They didn't use one of them as a 1:1 isolation transformer, did they? That would be so 2001, and on a ~80€ (way overpriced, IMO) power supply...

    Then I spotted two stacked/parallel metalized-film caps right next to one of the EEL-19s and a pair of K15A50Ds behind them... Flipping everything over, it's clear they're not in double-forward.



    Immediately I took a look at the PWM controller, curiously placed near the secondary, only to discover the SF29601 + LM324 quad op-amp. This thing actually uses an LLC half-bridge primary! What makes it really strange is a dual-output transformer, and indy reg/mag-amp secondary using schottky barrier diodes. What a strange combination!



    So, thoughts? Opinions? Any of you ever see such a combination of primary and secondary before? I mean we've all seen double forward + DC-DC, but LLC HB + indy mag-amp?
    Careful what you wish for... You just might get it.

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    just WTF?!

    Haven't seen any LLC-Resonance Design with one transformer for all the main voltages. The next thing close to it would be the FSP dual Transformer Design.

    Still I think your assumption with the isollation transformer is not correct!
    Take a look at the back, there you'll find the optocoppler.
    The second 'Transformer' could be more like the resonance tank.

    I've taken a look at the pictures I've taken from my 550W Silentmaxx Start Stop Thingy and the primary stage looks almost completely identical to yours. Just the secondary stage is different from your unit.

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    You may simply tell its bridge topography by the four amplitude coils for minor rails.

    This design has been used for SF entry-level units in Chinese market for years. They are recently replaced by (cheaper) double forward group regulation design.

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    Quote Originally Posted by Stefan Payne View Post
    just WTF?!

    Haven't seen any LLC-Resonance Design with one transformer for all the main voltages. The next thing close to it would be the FSP dual Transformer Design.

    Still I think your assumption with the isollation transformer is not correct!
    Take a look at the back, there you'll find the optocoppler.
    The second 'Transformer' could be more like the resonance tank.

    I've taken a look at the pictures I've taken from my 550W Silentmaxx Start Stop Thingy and the primary stage looks almost completely identical to yours. Just the secondary stage is different from your unit.
    Reading comprehension 101...

    I did write that the isolation transformer assumption was only the initial thought, and that I realized a couple of moments later that it is a part of the LLC resonant circuit...
    Careful what you wish for... You just might get it.

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    Gotta give SF credit, they really get their mileage out of those LLC resonant designs, even on the low end.

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    Quote Originally Posted by McSteel View Post
    I did write that the isolation transformer assumption was only the initial thought, and that I realized a couple of moments later that it is a part of the LLC resonant circuit...
    Sorry, I missed that part somehow...

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    Quote Originally Posted by McSteel View Post
    So, thoughts? Opinions?
    I would love to see a topic that explains the difference in topologies.

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