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Thread: Is it possible to combine double forward with LLC?

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    Default Is it possible to combine double forward with LLC?

    I saw a budget psu which utilizes LLC resonant converter(SF-*00P12A), but it looks like standard double forward one except LLC. Is it possible to combine double forward with LLC?

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    https://goo.gl/images/wsjaPp
    This one has three transformers, main transformer, 5Vsb and one for the LLC resonant tank. Source is offline, but is still in the Google cache.

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    Quote Originally Posted by -The_Mask- View Post
    https://goo.gl/images/wsjaPp
    This one has three transformers, main transformer, 5Vsb and one for the LLC resonant tank. Source is offline, but is still in the Google cache.
    Is it double forward? How can I distinguish topology easily?

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    Quote Originally Posted by rgbodosk View Post
    Is it double forward?
    No it has an extra transformer. Which is needed for a LLC resonant design, that's the most noticeable.
    How can I distinguish topology easily?
    Primary switching controller. Or if you have looked at so many power supplies it's mostly doable by just looking at the layout and used components, if you can't see or have a good picture from the primary switching controller.

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    Quote Originally Posted by -The_Mask- View Post
    No it has an extra transformer. Which is needed for a LLC resonant design, that's the most noticeable.

    Primary switching controller. Or if you have looked at so many power supplies it's mostly doable by just looking at the layout and used components, if you can't see or have a good picture from the primary switching controller.
    Sorry for my bad comprehension, so you mean that half or full bridge topology can only utilize LLC resonant?

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    Not only do I think it's not possible.. I don't know why you would.

    If you need better low load efficiency, you can get an LLC controller that also supports burst mode.

    https://www.semanticscholar.org/pape...bbe8d1c52f0645

    Is that what you're seeing?
    Rest in peace Mike Clements, aka "Yellowbeard"

    Rest in peace Joerg Theissen, aka "GI Joe"

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    Quote Originally Posted by rgbodosk View Post
    Is it possible to combine double forward with LLC?
    One generates 12V by some method and then 3.3 and 5V from this (hence double forward); as far as I understand, how one generates the 12V is independent of if one wants to convert again.

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    Quote Originally Posted by -The_Mask- View Post
    No it has an extra transformer. Which is needed for a LLC resonant design, that's the most noticeable.

    Primary switching controller. Or if you have looked at so many power supplies it's mostly doable by just looking at the layout and used components, if you can't see or have a good picture from the primary switching controller.
    Why does LLC need an extra transformer? For separate power feed to controller?

    Quote Originally Posted by ashiekh View Post
    One generates 12V by some method and then 3.3 and 5V from this (hence double forward); as far as I understand, how one generates the 12V is independent of if one wants to convert again.
    I found that LLCs can be only used with Double-Ended topologies.(Actually not quite sure about that)

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    This is not a tranformers . It just a inductor/coil in resonant tank. in many LLC design use champion cm6901 series they put the LLC controller in the cold area to control the 12v rectifier mosfet. Because hot area and cold area is isolate so they use a small tranformer to link the controller to the pwm/llc mosfet ( driver tranformer) some design they use isolate ic drive like Silicon lab replace the driver tranformer
    Finally we have three tranformer cross the hot and cold area in LLC design. It look similar a very old half bridge topology in the pass

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