5 are the capacitor voltage (dotted) and the transformer electromotive
force (emf) (solid). The middle and bottom traces are the
core flux and magnetizing current, respectively.
The interaction between the prefluxing device and the transformer
is governed by a resonance between the device capacitor
and the magnetizing inductance of the transformer
(Fig. 2). In Fig. 5, the emf of the transformer jumps to approximately
the capacitor voltage when the switch is closed. The difference
is attributed to the resistive and diode voltage drops. As
the capacitor begins discharging its energy into the transformer,
the flux of the core increases based on the volt-seconds provided
by the capacitor, and the magnetizing current rises according to
the curve. The transformer voltage decreases at a rate governed
by the resonance frequency given as