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