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Thread: LLC

  1. #1
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    Default LLC

    LLC seems somewhat recent; why is that? The idea didn't exist till recently or the necessary technology? Or perhaps there was little motivation till the drive for efficiency.

    This document mentions it being discussed 3 decades ago https://www.microsemi.com/document-p...reat-advantage

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    Quote Originally Posted by ashiekh View Post
    LLC seems somewhat recent; why is that? The idea didn't exist till recently or the necessary technology? Or perhaps there was little motivation till the drive for efficiency.

    This document mentions it being discussed 3 decades ago https://www.microsemi.com/document-p...reat-advantage
    It was always available, but without efficiency requirements, never really necessary.

    When I first used it in 2007, it was the only desktop PSU to have it. And I could only get the (very expensive) NXP controller in any kind of volume. When that volume dried up when I was ready to "revamp" the product, essentially doubling our forecast (as we weren't discontinuing the previous, just adding another model), I found out the lead time on the NXP controller was very long!

    Now-a-days, more companies are making LLC controllers and they're much cheaper. Champion, Infineon.. they're all making LLC controllers among others.

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    Quote Originally Posted by ashiekh View Post
    LLC seems somewhat recent; why is that? The idea didn't exist till recently or the necessary technology? Or perhaps there was little motivation till the drive for efficiency.

    This document mentions it being discussed 3 decades ago https://www.microsemi.com/document-p...reat-advantage
    Later Versions of the Playstation 3 had an LLC-Resonant mode PSU or what looked like it.

    The Reasons are the usual:
    a) cost
    b) no need
    c) proven alternatives

    Another Problem with LLC is that its a single voltage converter, Double Forward can be a multi Voltage Converter (ie: one Voltage in, multiple come out).
    So for a PC you need something to convert 12V to 3,3V and 5V, you need Controllers to control that.
    And that might just not have been there...

    The NMB WTX PSU I have from the early 2000s for example use a PIC16 and some weird stuff...
    Sadly I don't have access to some pix of that...
    That might have been/could be an LLC Resonant mode PSU...

    So they were just not that common at the time because you didn't need the advantages of an LLC Resonant converter.

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    I assume any patents have expired

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    Quote Originally Posted by ashiekh View Post
    I assume any patents have expired
    FRAND???

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