The circuit effects due to the transformer primary side series equivalent inductance in the Zero Voltage Switching Pulse Width Modulated Half Bridge DC/DC Converter and its impact on the effective duty are analyzed. The steady state equations and the small signal model of the converter are derived incorporating the effects of the complementary control and the utilization of transformer primary side series equivalent inductance. The closed loop small signal model of the converter employing average current mode control is derived. The open loop and the closed loop dynamics are analyzed on the basis of the models derived. The model predictions are confirmed by experimental measurements.
Furthermore, the Zero Voltage Switching is analyzed taking into account the effects of the parasitic capacitances of the diode rectifiers on the transformer secondary side. The Zero Voltage Switching condition is established in closed form.
