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Two Bridge Rectifiers In Parallel

Discussion in 'Electronic Basics' started by Bret Cahill, Jan 8, 2006.

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  1. Bret Cahill

    Bret Cahill Guest

    Two otherwise identical 2 phase ac sources are 90 degrees out of phase
    and you want to convert them to a single dc power supply.

    Is it possible to simply use two bridge rectifiers, one for each ac
    source and then connect the + output from one bridge to the + from the
    other, etc.?

    Assume the variation in dc voltage isn't an issue as it should be
    attenuated somewhat anyway.

    Bret Cahill
  2. Tim Williams

    Tim Williams Guest

    Yeah, that's a two-phase rectifier. A three-phase rectifier has a FWB on
    each of three phases, each 120 degrees apart. Two phase is two pairs of
    wires, one 90 degrees ahead or behind (depending on your point of view) the
    other. Since the peaks do no coincide, it will work just fine.

  3. Yes, you'll end up with a DC voltage with much less ripple :)
  4. It works fine as long as the two sources of AC are either isolated
    from each other, or all ends equally swing positive and negative
    around a common node.
  5. Bret Cahill

    Bret Cahill Guest

    It works fine as long as the two sources of AC are either isolated
    The sources would isolated until they reached the bridge.

    Actually I was interested eliminating two reciprocating cylinders &
    crankshaft by piping two "liquid pistons" through a check valve bridge
    to power a turbine.

    I'll search Google for a check valve bridge. It may be something that
    is only useful in theory.

    Bret Cahill
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