Switched mode dc-dc converters are the most efficient
power electronic systems that convert an unregulated dc
input voltage into a regulated dc output voltage. Switched
mode power supplies when compared with the linear power
supplies are smaller in size, much more efficient and have
high power density. Therefore they are used extensively in
personal computers, computer peripherals, communication,
medical electronics and adapters of consumer electronic
devices to provide different level of dc voltages. Among the
basic topologies of dc-dc converters buck converters are
widely used in portable consumer electronics. In general dcdc
converters are time variant, non linear dynamic systems.
The non linear nature of the dc-dc converters arise mainly
due to switching power devices, inductors and capacitors.
One inherent disadvantage of buck converter is its reliance
on large passive components. The increase in switching
frequency reduces the size of components but it leads to
various converter losses thereby reducing the efficiency
when used particularly in light loads. In order to overcome
these limitations soft switching methods are used [1].