PROGRAM OVERVIEW

Description

Generally DC-DC converters are changed DC electrical voltage one level to another level like step-up and step-down. It is convert fixed DC input voltage to a variable DC output voltage. Various type of converter is an available boost, buck, cuk, zeta, SEPIC etc. There are two types of DC/DC converters: linear and switched. A linear DC/DC converter uses a resistive voltage drop to create and regulate a given output voltage, a switched-mode DC/DC converts by storing the input energy periodically and then releasing that energy to the output at a different voltage. The storage can be in either a magnetic field component like an inductor or a transformer or in an electric field component such as a capacitor. Transformer-based converters provide isolation between the input and the output.

What will you learn?

Non-Isolated DC/DC Converters

Six most popular topologies of non-isolated DC/DC converters (also called classical type DC/DC converters) are as below. All of them are single-switch converters.

1. Buck converter (step-down voltage only)

2. Boost converter (step-up voltage only)

3. Buck/Boost converter (inverse voltage, and step-up/step-down voltage)

4. Ćuk converter (inverse voltage, and step-up/step-down voltage)

5. Zeta converter (step-up/step-down voltage)

6. Sepic converter (step-up/step-down voltage)

Isolated DC/DC Converters

There are four most popular topologies of isolated DC/DC converters. All of them are able to step-up or step-down voltage. They are:

1. Flyback converter (single switch)

2. Forward converter (single switch)

3. Single-ended two-switch forward converter

4. Phase shift full-bridge converter

Switch-mode converters offer three main advantages:

· The power conversion efficiency is much higher.

· Because the switching frequency is higher, the passive components are smaller and lower losses simplify thermal management.

· The energy stored by an inductor in a switching regulator can be transformed to output voltages that can be smaller than the input (step-down or buck), greater than the input (boost), or buck-boost with reverse polarity (inverter).

Prerequisites:

  Having knowledge of Power Electronics fundamentals like SCR (Silicon Controlled Rectifier) Family.