III. THE HIGH VOLTAGE TRANSFORMER MODEL
To simplify the analysis, in low voltage applications, the
adopted model to high frequency transformers is based only
in two elements; the magnetizing and leakage inductances,
both generally referred to the primary side of the transformer.
However, due to the high number of turns in high voltage
transformers, the parasitic capacitances distributed between
turns, layers and windings that can be ignored in low voltage
transformers, starts to exercise significant influence. This
phenomenon become still more evident when the transformer
presents a high turns ratio, because the capacitance is
referred to the primary side with a square of the turns ratio.
A. Generic Model to High Frequency Transformers
A high frequency transformer can be generally
represented by the circuit presented in Fig. 2, were [7]:
9 R1 and R2 are the resistances of the primary side
and secondary side windings, respectively.
9 L1 and L2 are the leakage inductances of the
primary and secondary sides, respectively.
9 C1 and C2 are the capacitances of the primary
side and secondary side windings, respectively.
9 L
m is the magnetizing inductance.
9 C3 is the capacitance between primary side and
secondary side windings.
9 Rf represents the magnetic losses in the
transformer core