[ARC5] Transformers in low-voltage to B+ supplies

[Tim]

Hi Les - Here is a solid-state 12 VDC power supply I built for my A.R.C.
Type 12 VHF aircraft set.  It also works with HF Command Set receivers.
Altho it is built around a junk box ferrite core (3B9 material versus iron)
the basic design Kludge is pretty simple and works great.
I like your description of "trapezoidal drive" which does describe a
real-world square wave with its finite rise and fall times.  hihi.  Anyway,
take a look here for maybe some ideas to use.
https://www.n6cc.com/solid-state-dynamotor/

73, Tim
N6CC

On Tue, Oct 25, 2022 at 6:11 PM Leslie Smith <lnsmith99 at gmail.com> wrote:

>
> Hello all:
>
> I wish to build a lead-acid battery to B+ inverter using (probably) a
> conventional iron-core transformer.  Two configurations are generally seen
> in typical circuits.  I will describe these as "H" bridge and solid-state
> vibrator replacement.  The "H" bridge uses an untapped low-voltage winding;
> the vibrator circuits use a transformer with a center-tapped primary
> winding.
>
> Since I can choose the switching frequency, and a higher frequency has
> some advantages, what limits the operating frequency?  Assume a
> conventional EI (or perhaps toroidal) core using common transformer iron.
> (I assume the 'iron' used in most power transformer share a 'common'
> quality.)
>
> I intend to feed 'the beast' with a trapezoidal wave-form not a sharp
> square wave.
>
> Thanks for observations.
>
> Leslie
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