Power Electronics: The Basic Guide to Learn the Boost Converter

A boost converter is a basic DC-DC converter which is used to step up the dc voltages.

Basic Construction and Working

The basic construction of a Boost converter involves an induction, a capacitor, a diode and a MOSFET which is used in switching mode. A DC supply is connected to the input terminal and power the circuit.

boost converter circuit

An electronic supply is provided to the gate of a transistor which switches it on and off after certain interval of time.

When transistor acts as a closed switch: The current flows from the battery through the inductor and then through the switch. Doing so turns on the switch

When the transistor is opened: Once the gate is turned off, the current flows through the diode, and then through the capacitors. During each cycle when the transistor is on the current flows through the diode and then to the capacitor. However, the diode doesn’t allow reverse flow of current. As a result of this, we obtain a boost voltage at the output.

The video below illustrates the working of boost converter:

Practical applications of Boost Converters

Hybrid electric vehicles:: Hybrid electric vehicles use the boost converter to step up the dc voltage coming out from their batteries. A typical circuit used with EHVs steps up the voltage from 200 V to 500 V.

Portable lights: The portable lighting systems use boosting circuit to obtain an output voltage that is higher (usually double) of the input.

Also, learn:

Power Electronics Converters: Understand the four types of power electronics converters that are used to convert between AC – DC, DC-DC, AC – AC, DC – AC.

Voltage regulator vs Buck converter: A comparison between the voltage regulator and buck converter for DIY Enthusiasts and electronics projects makers.

MOSFET as Linear regulator: The working of MOSFET as a linear regulator.

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