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A practical power supply normally employs an isolation
transformer.In a practical transformer model,leakage inductance
and magnetizing inductance must be considered in circuit analy-
sis and can be utilized to achieve zero-current switching(ZCS).
In this report, we are going to propose a new kind of
resonant converter topology switching at zero current.Utilizing
the leakage inductance of the transformer and an capacitor in
parallel with the transformer to yield resonance and to achieve
ZCS for both the switch and the diode, the switching loss will
be reduced and the switching frequency can be raised. The
steady-state analysis of this converter is presented using
the periodicity of the time-domain waveforms. In this
analysis, appropriate bases for voltage, current,impedance,etc.
Are chosen. consequently the normalized output voltage and
current characteristics can be established to obtain the
output-plane model for the analysis of nonlinear loads. Using
the switch off-time as a control variable, we can plot the
normalized output characteristics and regulate the output
voltage by varying the switch off-time . Furthermore , the
state-plane analysis is employed to visualized the equilibrium
trajectory .Finally ,the small-signal equivalent circuit is
derived for controller design.
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