Buck Converter Case

A basic dc-dc converter works in a way that it converts input dc voltage into output dc voltage. For example, an input voltage of 60V is step down to an output voltage of 20V for a particular application. The converter can be divided into two types of dc-dc converter, which are soft switching converter, and PWM converter where the latter is more widely used in today’s industry.

There are four types of converters available:

1) Buck Converter

This converter converts a higher dc voltage to a lower dc voltage.

2) Boost Converter

This converter converts a lower dc voltage to a lower dc voltage.

3) Buck-Boost Converter

This converter converts a higher or lower dc voltage to a lower or higher dc voltage respectively.

4) Cuk Converter

This converter converts a higher or lower voltage and possesses no polarity reversal at the output.

These are some of the functions of a dc-dc converter:

• To reduce the ac ripple voltage on the dc output voltage

• The input dc voltage is converted into output dc voltage

A buck converter consists of voltage source VS, controlled switch S, diode D, and filter inductor L, filter capacitor C, and load resistance R. The controlled switch is a transistor, which turns on and off repeatedly. The switch controls the period of the on and off duration of the circuit. A transistor usually operates this switch usually a MOSFET. The operation of this switch causes the amount of energy from the voltage source to the inductor to be controlled or limited.

High-frequency