This thesis mainly studies and implements a 1200-W DC/DC
push-pull converter. The circuit analysis of a push-pull converter
is discussed. The presented converter uses the battery as the
power source, such that for high power output and low input
voltage, its input current will be extremely large. For a
conventional push-pull converter, the primary leakage inductance
of the transformer will cause a very high voltage spike due to hard
switchings of the switch devices. To solve this problem, a snubber
circuit must be added, meaning that the power loss in the snubber
circuit consequently decreases the overall converter efficiency. By
using the input inductor, the resonant capacitor and the primary
and secondary leakage inductors of the transformer to form a
resonant tank, the switch can be turned off at its lowest current.
Therefore the voltage spike of the switch is reduced and the
power loss of the snubber circuit is diminished.
Design issues of the presented push-pull converter are
presented in this thesis. By setting the input inductance and the
resonant capacitance, other component parameters can be
calculated. Finally, a 1200-W push-pull converter is implemented.
Experiments are conducted to verify the heoretical analysis.