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Buck/Boost Converter

4.7 | 8 ratings Rate this file 184 Downloads (last 30 days) File Size: 8.43 KB File ID: #27620 Version: 1.0
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Buck/Boost Converter


Hadeed Sher (view profile)


A DC DC Converter capable of buck/ Boost input voltage

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Below 50 % duty cycle it steps down the DC Voltages and from 50 -99% of duty cycle it steps up the input voltage


This file inspired Boost Converter For A Pv Cell and Buck Boost Convertor.

Required Products Simscape Power Systems
MATLAB release MATLAB 7.7 (R2008b)
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Comments and Ratings (22)
21 Feb 2017 kh asnoune

thanks hadded,please can u help me; i need a simulation of closed loop of buck boost cnverter. thanks

13 Sep 2016 Nelge

Nelge (view profile)


22 Feb 2016 omar kanaan

Pls can u help me with an mdl file of a boost converter with a constant output voltage and possible varing input voltage. My email is for ex from 10 to 20 it give 15 v

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22 Jun 2015 Nelson Recabal


02 Mar 2015 Vongani Maluleke

Dear Sir Hadeed

Regarding the buck boost converter, when they say you supply/need 50W and you use PWM do I still use the values you gave bellow or its another case, should I email my project so you can assist?

MR Maluleke

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11 Nov 2014 kamilu sanusi

this is indeed helpful. thank u Hadeed Sher,
Pls can u help me with an mdl file of a boost converter with a constant output voltage and possible varing input voltage. My email is
Thank you

27 May 2014 Hari Sankar

Dear Hadeed sher
but i have problem with simulation of my circuit, can i send my project to you? Please help me

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27 May 2014 Hadeed Sher

Hadeed Sher (view profile)

Dear Hari Shankar,

Here are the required values.
Rl=1 ohm
C=1500Micro Farad
Rload=10 ohm

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26 May 2014 Hari Sankar

What is the amount of L, C, RL,Rc, and R load, please answer me.....

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07 Jan 2014 Konstantinos Merokis

25 Dec 2013 zaid trad

23 Jun 2013 khoukha imarazene


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09 Feb 2012 Mohammad

i made my buck boost circuit but i am having problem on what values for L and C i have to put in order to get the correct out put graphs


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03 Jun 2010 Hadeed Sher

Hadeed Sher (view profile)

Dear wassay, hope that you have the answer of the question

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03 Jun 2010 Wasay Alvi

Sir Hadeed sir,
I am designing MPPT controller for solar pv panels, kindly i wanted to ask you about the operation of Cuk converter the out put of cuk is also negative. so is there any method that the duty cycle of dc-dc converters automatically changes with the time? like i have seen in some reference papers that they do some feed back to the controller to change the duty cycle with time.. plz need your help regarding this .. i would really appreciate ur effort.

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29 May 2010 Hadeed Sher

Hadeed Sher (view profile)

there are several books on this topic. generally this circuit is not used for BUCK/BOOST operation. designers use regular topologies of buck and boost for these specific tasks. The answer to this question is very well discussed in the book i mentioned above.

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29 May 2010 Manjunath Matam

I have a small query reg Buck Boost converter,

1. If mode of operation is Buck , let i/p vol is 200 V , my doubt is what the minimum voltage we can get , and how this will be decided in practical ckts as well as simulation ckt

In similarly

2. If mode of operations is Boost , let Input vol 24 V , then what max output voltage can be obtained at o/p , what factors affect this range of o/p voltage

Thank you sir

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29 May 2010 Hadeed Sher

Hadeed Sher (view profile)

well if you need a positive voltage then add an other BUCK/BOOST circuit with 52% duty cycle (Since at 50 % due to losses in circuit elements output will be slightly less then input).
Secondly the circuit elements needs redesigning if you disturb the input voltages to a very large extent. Theoretically it must give us infinite output voltage at 100 % duty cycle but it never happens because of the fact that practically there are always losses in circuit elements

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29 May 2010 Manjunath Matam

29 May 2010 Manjunath Matam

Thank you for the realy reply

and Let me correct .........

What changes to be done in the circuit if i want +ve o/p voltage ...

I simulated ur ckt for boost operation of 24 V input to 200 V output by setting duty cycle 89.23% (calculated from Vo/p / Vin = D/(1-D)) ...........

I got the output of -157 V , where i were wrong ......Plz help me.

Thank You

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29 May 2010 Hadeed Sher

Hadeed Sher (view profile)

@manjunath: This type of DC DC converter is also known as polarity inverting converter(For more information on DC DC Converter please refer to Switching power supply design by Abraham I pressman). The output is always inverted .So there is nothing wrong with this circuit.

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29 May 2010 Manjunath Matam

Good file.........
i simulated it but , it is giving -ve output voltages in both buck and boost modes , plz check it once

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