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  1. #1
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    SMPS for 5000W can be a Full Bridge

    On page 9 of the book “Power supply design, Volume 1 Control” by Dr Ridley, he states that a Full Bridge converter is good for power levels from 200w to over 5000w.
    Most places where I have worked would usually say above 1000W means a resonant converter is really needed.
    If anything, it is said that this is because the noise of a hard switched converter at above 1000W could disrupt the signal circuitry in the control section, and stop the power supply from operating properly.
    Is Dr Ridley a little wide of the mark, or not.?

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  2. #2
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    Re: SMPS for 5000W can be a Full Bridge

    as you well know, there are a LOT of parameters and conditions to making a quality converter,
    regardless of power level or topology

    the guidelines you mentions change with quality of switches, quality of capacitors and topologies

    Dr Ridley's book is from 2012
    the experience and training and "up to date-edness" of the people where you have worked
    color their guidelines

    everyplace i have worked has their preferred parts, topologies, and their biases.

    the proof is in the pudding -
    are the parts available?
    does it meet the spec?
    can it be built in production? (without needing an expert to trim - adjust bits and pieces to make it work)?
    can it be sold at reasonable cost to buyer and profit to seller?


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  3. #3
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    Re: SMPS for 5000W can be a Full Bridge

    There are a lot of hard switched H bridges up to 3.5kW ( and well above actually ) usually 20kHz for above 3.5kW and up to 50kHz below 3.5kW

    for a compact design - read less heatsink - phase shift full bridge is now preferred - as it is quieter ( RFI ) and low loss switched

    LLC actually has higher conduction losses in the mosfets ... for the same power of converter ...



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  4. #4
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    Re: SMPS for 5000W can be a Full Bridge

    Ridley is still very active and putting out new material.

    He has a Facebook power supply design group that you
    could join (I think - sort of a velvet-rope deal for many
    "interest" groups, so don't come all gimme-gimme).

    There has been a bit of progress in the last 7 years or
    so on every front. Power devices, magnetics, topologies.

    New additions to Ridley's portfolio include a lot of pretty
    sophisticated magnetics and loop stability modeling tools.
    Most of it over my head (I just string transistors together
    more or less). But I like to keep an eye on the neighbors.


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