# Two Bridge Rectifiers In Parallel

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

1. ### Bret CahillGuest

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

Bret Cahill, Jan 8, 2006

2. ### Tim WilliamsGuest

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.

Tim

--
Deep Fryer: a very philosophical monk.
Website: http://webpages.charter.net/dawill/tmoranwms

"Bret Cahill" <> wrote in message
news:...
> 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
>

Tim Williams, Jan 9, 2006

3. ### Geir KlemetsenGuest

"Bret Cahill" <> skrev i melding
news:...
> 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.

Yes, you'll end up with a DC voltage with much less ripple

Geir Klemetsen, Jan 9, 2006
4. ### John PopelishGuest

Bret Cahill wrote:
> 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
>

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.

John Popelish, Jan 9, 2006
5. ### Bret CahillGuest

> 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.

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

Bret Cahill, Jan 10, 2006