On 2021-02-03, malua mada! <fritzo2ster@gmail.com> wrote:
>
> I AM using 3 bridges. The two AC inputs on each device are joined thus doubling up / paralleling (?) each bridges' diodes.
> I could have done it with one and a half bridges (not doubling up on diode pairs) but why be stingy.
That should work perfwectly so long as the DC terminals all match up.
The only reason I can think of for heat at the Y point is if the
terminals are dirty or loose.
--
Jasen.
Reply by malua mada!●February 3, 20212021-02-03
Sorry I was not aware that the term "bridge" is reserved ... but I AM using 3 bridges. The two AC inputs on each device are joined thus doubling up / paralleling (?) each bridges' diodes.
I could have done it with one and a half bridges (not doubling up on diode pairs) but why be stingy.
Reply by Cydrome Leader●February 2, 20212021-02-02
malua mada! <fritzo2ster@gmail.com> wrote:
> I am running 3 phase AC into a set of transformers, Y config, and thence into bridge rectifiers . One leg of the output side of the transformers goes to the diodes. the other leg to the Y connection.
> That Y connection gets warm. (why?)
> Should it be connected to DC ground?
The connection between this and that point is wrong.
Reply by Jasen Betts●February 2, 20212021-02-02
On 2021-02-02, malua mada! <fritzo2ster@gmail.com> wrote:
> I am running 3 phase AC into a set of transformers, Y config, and
> thence into bridge rectifiers . One leg of the output side of the
> transformers goes to the diodes. the other leg to the Y connection.
> That Y connection gets warm. (why?)
> Should it be connected to DC ground?
The y connection should not get warm, is the connection there good?
it takes 6 diodes for a threee phase rectifier which is not normally
called a "bridge", that term is usally reserved for diamond-shaped
arrangements that have input on two opposing corners and output on the
other two.
--
Jasen.
Reply by Phil Allison●February 2, 20212021-02-02
malua mada! wrote:
===============
> I am running 3 phase AC into a set of transformers, Y config, and thence into
> bridge rectifiers . One leg of the output side of the transformers goes to the diodes.
> the other leg to the Y connection.
> That Y connection gets warm. (why?)
>
** Have you linked the " + "and " - " of each bridge ?
That is NOT how it is done.
Google it.
..... Phil
Reply by malua mada!●February 2, 20212021-02-02
I am running 3 phase AC into a set of transformers, Y config, and thence into bridge rectifiers . One leg of the output side of the transformers goes to the diodes. the other leg to the Y connection.
That Y connection gets warm. (why?)
Should it be connected to DC ground?