Re: [CAD_CAM_EDM_DRO] Re: Smallish CNC Miller

Hi Wally,

That explaines it rather nicely, thank you.

Regards,

Terry

> > Hi Wally,
> >
> > I'd realised it wouldn't be possible to combine both sides of the
> centre-tap
> > in its AC form because the phase angles wouldn't be right. I was
> going to
> > rectify and smooth first then try to add them.
> >
> > Will that work or am I looking for larger site transformers?
> >
> > Regards,
> >
> > Terry
> >
>
>
> You need to build a center tap full wave rectifier. In this
> configuration you use the 55-0-55 winding as it is. Basically each
> winding conducts 1/2 the time so the current is doubled
> automatically. For the voltage you end up with 55 x 1.414 volts out
> or 77.8 volts minus 1.4 volts diode voltage drop = 76vdc. A very
> simple explanation is here. Notice they are not showing the filter
> capacitors. Ground would be the center tap and positive would be
> were the 2 diodes connect together. The capacitors would connect to
> these plus and ground points.
>
> http://www.allaboutcircuits.com/vol_6/chpt_5/4.html
>
>
> Wally
>
>
> >
> > > > I'm not sure yet if it is possible to combine both sides of the
> > > centre tap
> > > > or should I use it as two supplies or 55 volts?
> > > >
> > > > Regards,
> > > >
> > > > Terry
> > > >
> > > > > > No I'm not mistaken. These transformers are centre-tapped
> 55-0-55.
> > > > >
> > > > > You're right, I'd forgotten they were centre tapped.
> > >
> > > If it is a true 55 0 55 transformer with 3 wires only. Then you
> can
> > > not run the windings in parallel for 55volt double current
> operation.
> > >
> > > In its current configuration each end of a coil is connected to
> the
> > > other in a series additive configuration.
> > >
> > >
> > > Wally
>
>
>
>
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