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Half Bridge vs Full Bridge

Discussion in 'Electronic Design' started by toyo22r, Mar 1, 2006.

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  1. toyo22r

    toyo22r Guest


    I am somewhat new at smps. I am designing a simple circuit to amplify
    square wave 400hz signal to 340Vpp signal. Am I correct to assume that
    half bridge drive circuit is for single rail only (ie positive swing) an
    that what i should use is a full bridge driving 4 MOSFETs?

    Also I breadboarded a half-bridge circuit driving 2 MOSFETs. The rai
    voltage is rectified line from a variac so that i can ramp it up slowly.
    The output signal looks good until I reach about 80V. The the signa
    appears to saturate and its amplitude stays at about 60V and will no
    increase even with increasing rail voltage.

    Thanks in advance.

  2. toyo22r wrote...
    Obviously you're doing something wrong, but with so little
    detail in your post we can't give much useful advice.
  3. Guest

    A half bridge only fluxes the transformer in 1 direction and so uses
    less than it could. Your problem is probably that your bridge
    capacitors are not big enough and it would most likely to be cheaper to
    use a full bridge which drives the transformer in both directions than
    get large capacitors.
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