How to design Boost converter in MATLAB Simulink

How to design Boost converter in MATLAB Simulink

MATLABSolutions demonstrate how to use the MATLAB software for simulation of Boost converters are mainly used to step up the input voltage to desired values, A boost converters operate on switching mode for the purpose of dc to dc conversion in which output voltage is always greater than input voltage given.

Introduction to Boost converters

Boost converters are mainly used to step up the input voltage to desired values, A boost converters operate on switching mode for the purpose of dc to dc conversion in which output voltage is always greater than input voltage given.it is also known as step up converter this name originated from process of step up transformer where input is stepped up to desire level, On the basis of law of conversion of energy the input power should be equal to output power considering there are no losses.

                            Input power (Pinput) = output power (Poutput)
As we know that the output voltage is greater than input voltage
Vout>Vin, therefore  input current will  be more than output current.    Vin < Vout and Iin >Iout

Principle of operation of Boost converter

Working principal of boost converter is based on inductor used at input side of circuit is generally use to make barrier for sudden varying of input current ,it stores the energy in form of magnetic energy when the switch is in off condition and gets discharge when switch is closed. The capacitor used at the output side of the circuit considered as large enough that the time constant of RC circuit in the output stage is high. The large time constant compared to switching period represents that a constant output

voltage Vo(t) = Vo(constant)

The boost converter can be structured in two different ways-

Open loop converter – Boost converter said to be a open loop converter when there is no feedback between input and output, therefore the open loop converter cannot be regulated.

Closed loop converter – Boost converter is said to be a close loop converter when there is feedback between input and output, therefore the close loop converter can be regulated.

Control of close Boost Converter is utilized to acquire a steady DC output voltage. The output voltage is decided by the switching frequency and duty cycle. In close loop converter process the output voltage is compared a set voltage and the error is decreased by controlling the switching pulse .The fundamental activity is if the error value is certain the obligation cycle is diminished and if the error is negative the D cycle is expanded by proceeding with the procedure ceaselessly the yield voltage is looked after steady.

The output voltage of an energy component fuel cell is an element of its load. The Boost dc/dc converter adjusts the power device fuel cell yield voltage to the bus voltage, and the voltage regulator improves the output voltage inside a ±5% resistance band under typical activity. A customary PI regulator can be utilized for the boost dc/dc converters. Practically speaking, a load sharing regulator can be applied on the converters, associated in equal, to accomplish a uniform load appropriation among them . Likewise, a dq-changed two-loop current control conspire is introduced for the inverter to control the real and reactive power conveyed from the fuel power framework to the network.