How does a Buck Boost converter work? Buck-Boost converter Working Explained

[@danielardelian2]

So what topologies are used if not this one in the video? 🤔

[@habtamusium8646]

my electronics bank is improving . many thanks !

[@FoolishEngineer]

Great!

[@TheGuguBrah]

This is such a good way to teach this. You give intuition behind how it works, you show how the electricity flows through the circuit (which is awesome!) and then you show the waveforms with this. Your video could not be better, please keep making more like this because this is very rare in the electronics field! Thank you!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

[@FoolishEngineer]

Glad you enjoyed it!

[@khuongmap4724]

One thing that confuses me, the voltage across the capacitor cannot change immediately, which means the V_c = V_out will slowly charge up when the switch Q1 is turned off. Please tell me what am I misunderstand here?

[@ytpro6453]

Big fan sir

[@TheEnlightened1257]

why on earth would you name yourself FOOLISH ENGINEER

[@hoofheartedicemelted296]

Wow, not only explained very very well, but accompanied by waveforms. I actually understood this. You are a very good teacher sir. This was very helpful. Thumbs up and saved. I subscribed as well.

[@FoolishEngineer]

You're very welcome!

[@mostaf682]

May you elaborate a little more on "Nowadays nobody uses this topology in the actual system due to its numerous disadvantages, but this is the base of all step up-step down converters"? What is used instead? Thanks in advance!

[@MrRohailbootwala]

did you get a reply? I am curious as well

[@mostaf682]

@@MrRohailbootwala I did not get a reply, just a like.

[@FoolishEngineer]

You can use Sepic converters, cuk converter or flyback converter as well for isolated output

[@karthiku5840]

Could you please explain the bidirectional dc to dc converter for 48v battery, bldc motor for regeneration power

[@alexandra.kalaitzidou]

The depiction shows an electrolytic capacitor and these capacitors have certain polarity. In the case when they get discharged they have different polarity from the case that were charged, similarly with the polarity change of the inductor. So wouldn't that destroy the capacitor?

[@blues1337]

Wow! This is a great, concise, explanation.

[@FoolishEngineer]

Thank you so much, Glad you liked it!!

[@paulwang5650]

What's with the blurred out part for the VDS(Q1) waveform?

[@arnabroy5613]

Please make a practical video. Design physically and test efficiency

[@Dc_tech386]

The n channel mosfet can be turn off I use a micro controller and I use the 440 ohms resistor to turn it off in high side switching it’s not hard or tricky from the gate is turn off that the fix

[@pinkshrimpstudio5831]

Hi, this design worked for me when I connected a DC battery to it, but when I use a solar panel as input it no longer boosts the voltage… Can someone help me with this? The solar panel when I measure with voltmeter gives about 5 volts and the battery I used gives 1.5 volts.

[@ShantanuHinge]

Explained nicely!!

[@FoolishEngineer]

Glad it was helpful!

[@attilarivera]

👏👏👏👏👏👏👏👏👏👏👏

[@sunilcherianpullockaran8817]

I was told that voltage from solar panels remain nearly constant in bright sunlight or in the shade and that it is current output from the panel that changes drastically from when in shade and direct sunlight. At 7:17 of the video you mention to the contrary.

[@FoolishEngineer]

Well!!! whatever you heard about current is true, but the voltage of the solar panel also changes tremendously due to climatic conditions

[@Sachinn555]

Bro we going to make a project on this topic so we need complete information Will you provide ?

[@FoolishEngineer]

Dude, I am happy to help.. you can check all the references in the description of the video

[@rajware]

Thank you for the detailed explanation, with diagram and charts - this easily helps understand the basic working of Buck Boost converter! 🙂

[@FoolishEngineer]

Thank you so much! Please show support to my video with Super thanks.

[@joshuashava6589]

nice ..thanks alot..makes much sense now..can i please have example parameters

[@FoolishEngineer]

Sure, soon I'll make video on it

[@KamalanNaidoo]

Yes please make a video

[@Edittname]

Wow, this help me a lot! Thanks

[@FoolishEngineer]

Glad to hear it!

[@tawheedrony]

Why the polarity of the inductor reverses?at 3:49

[@FoolishEngineer]

It is the property of the inductor, I'll upload a video on the same, stay tuned!!!😀

[@chandragupta9535]

Because of Lenz's law.

[@ZeRo8625]

Because when the fet switches off, the inductor wants to maintain the current flow. To do so, it becomes a source. Since current flows from plus to minus, polarity is reversed.

[@udishagangopadhyay6036]

what is the working of the feedback?? and please tell what is the circuit of feedback and how it is working in this circuit...... please help its urgent

[@FoolishEngineer]

It is the type of Analog control.

[@lavanyas8870]

Can you explain how this cicuit steps up and steps down the voltage and how you derived the formula for Vout?

[@FoolishEngineer]

step up & step down depends up on the duty cycle of PWM. You will get the Vout formula derivation in any power electronics reference book.

[@khanzy7767]

we want design parameters and numerical problems. also you did a great job in the video

[@linggiman]

Thank you for the education..you are great educator.

[@FoolishEngineer]

Thank you so much for watching!! Please don't forget to subscribe to our channel

[@nawazshareef9319]

Sir this is my major project , can u please share the ppt of this 👍

[@jamesdean7756]

Your Accent is too difficult to follow

[@kumarjava8298]

What would be the optimal solution for Solar charging, Buck Boost converter or only Charge control circuit practically?

[@FoolishEngineer]

You need hardware of buck-boost converter & controlling strategy of maximum power point tracking

[@rohithchandana1688]

This is really really really good explanation....

[@FoolishEngineer]

Thank you so much for watching!! Please don't forget to subscribe to our channel

[@robert5861]

A very good and detailed explanation. Thank-you

[@FoolishEngineer]

You are welcome!

[@ismailsoliu9356]

I need circuit digram and components

[@Wazzit2ya]

a very good explanation !

[@FoolishEngineer]

Glad it was helpful!

[@walidsulaiman5269]

if noone uses this topology anymore, what sort of topology do they use for in order to step up and down input voltage ?

[@FoolishEngineer]

Sepic or cùk converter

[@kpsrathod2324]

Please make battery balencer video

[@Iziedking]

Please Help me with the design parameters

[@AlbertoM4A1]

better than my power electronics teacher XD

[@FoolishEngineer]

Thank you!!

[@kathisravani6710]

Sir , could you pls provide design parameters

[@FoolishEngineer]

Soon!!

[@haroonnrashid1069]

VERY INFORMATIVE , EXPLAINED SIMPLY and properly , thankyou

[@kevingibson4377]

Thank you nicely explained.

[@FoolishEngineer]

Thank you so much, Glad you liked it!!

[@durgeshpatil5872]

How many voltage are boosted using boost converter input and output

[@FoolishEngineer]

It depends on the duty cycle & input voltage. I would suggest if you are aiming for high Power Application Don't go for Buck-boost converter. Use any other isolated topology

[@fadlee9276]

Can you..share..the specific components use..please

[@FoolishEngineer]

What are your specifications

[@drlerkan]

thanks. It was very descriptive and understandable.

[@FoolishEngineer]

Thank you so much for watching!! Please subscribe to our channel

[@박종혁-r3o]

I have a question at 4:27, to use a mosfet in the triode region, V(Drain to Source) have to rise linearly so that drain current rise linearly.

[@FoolishEngineer]

Why do you want a MOSFET in Triode region? it works either in saturation region or cutoff region in Power supplies.

[@tithur100]

what are the disadvantages of the Non isolated DC TO DC CONVERTERS

[@ngwajudengwa8826]

Thank you very much for the explanation. Please could you help me with the design parameters?

[@FoolishEngineer]

Sure! I'll make a video soon!

[@ngwajudengwa8826]

Wow! I will be really grateful.

[@a.c.2659]

Thank you sir, good quality content as always.

[@FoolishEngineer]

Glad you enjoyed it

[@Googlename699]

I have confusion on how to use a multimeter. When I measure ohm by fluke, it starts with a big number then goes down to a number. Why it does that? (e.g starts with 315.7 ohm then decrement down to 150 ohm)

[@antormack]

how to calculate the parameters

[@nafeesakhtar7425]

Nice explanation 😀

[@FoolishEngineer]

Glad you liked it!

[@ashiqhussainbaig9801]

i want output stable constant voltage of 12.15 instead of input voltage is 15volt. are u sure is that possible for example like stabilizer and computer ups

[@braskcovroldinin8816]

this explains way better then 99% of examples they all fail to explain that is reversed load and probably made many people putting the cap the wrong direction

[@nfcradio4622]

This is not buck boost converter in Buck Boost Vout may Be >Vin or Vout may Be =Vin or Vout may Be

[@silviodisavino8728]

Thanks for your video. I want to realize a bidirectional buck and boost converter. Can you help me to design it?

[@khushalkhan3235]

Can u have the MATLAB simulink model for this equivalent circuit !

[@RoshDroz]

Great explanation for a novice like me, thanks!

[@FoolishEngineer]

Glad it was helpful!

[@nanfwangdabiring1520]

Please sir I need you to help me out with the design parameters most importantly that of the feedback which I guess is responsible for switching the mosfet

[@TheHuntermj]

With a battery this is quite efficient but wouldn't it waste a portion of the solar energy because it turns off for a cycle?

[@pcbekri340]

i just want to say thank you you are the first one that i watch on the internet that mentions the inductors sign change when switch is on or off in all text books they leave the same sign on the inductor and tell you that it will forward bias the diode but it doesn't make sense once again thaaaank you

[@anasasim3856]

At 5:14 should the polarity of the current through the inductor also not reverse? Thanks for the video.

[@enobongoduobuk1000]

Thank you for the video. please i would like to know the control loop and the output parameters such as output current and output voltage

[@phillipyang2872]

Thank you, this is such a clear and concise explanation of the Buck Booster converter!

[@kcpkaizo1669]

i need a design for 42v of Vo on buck boost

[@kcpkaizo1669]

12vin

[@gmcjetpilot]

Your solar example of lowering or raising volts to 12 volts is good. However there is another solar example. If the panels provide 19 to 20 volts, the battery controller may be more efficent at higher voltage (up to 30 volts). So boosting the 19.5 v to say 28 volts chargers at a faster rate. This is a problem I had with my "Power Station". A power station being a portable battery, with charge controller, inverter, usb ports and display to monitor charge and load power. With my solar panels connected direct I was getting 75 watts. With the boost converter in-line I went to 133 watts (this is max peak sun).

[@henrytzuo8517]

THANK YOU, GREAT EXPLANATION!!

[@FoolishEngineer]

Thank you so much, Glad you liked it!!

[@sonlehong7568]

Thank u so muchhhhh! from VietNam

[@FoolishEngineer]

Thank you so much for watching!! Please don't forget to subscribe to our channel

[@afzalshahwani720]

We are applying dc current on the input side when MOSFET is turned on the inductor will act as a short circuit because its dc current doesn't blow out the circuit please elaborate.

[@TB-jl9fr]

What's the duty cycle? What MOSFET are you using and which params is your circuit made for?

[@Dc_tech386]

I Have a question can I parallel solar and wind turbine

[@devanesh5791]

nandri vanakam

[@Dc_tech386]

A push pull can do the job with a feedback

[@hardikyadav5277]

how to get more current Iv,Ov-12 Ia-1A Oa -8A

[@FoolishEngineer]

You can configure your control logic if you will be using any ASIC

[@hardikyadav5277]

@@FoolishEngineer input and output voltage- 12v input current- 1A output current-8A

[@hardikyadav5277]

@@FoolishEngineer please reply

[@FoolishEngineer]

@@hardikyadav5277 Input power is 12x1 = 12W & output power is 12x8 = 96W. This is not possible, either you have, more input voltage or current to get 96W output power.

[@hardikyadav5277]

@@FoolishEngineer we can`t amplify current using any means like transistors and using other passive components

[@change_your_oil_regularly4287]

Great work 👍 thank you

[@FoolishEngineer]

Thank you so much, Glad you liked it!!

[@urla.tejaswitaruneee2483]

Thanks for this valuable information bro. I just wanted to implement this buckboost converter to hardware. So Could please help me in the designing of this converter!

[@urla.tejaswitaruneee2483]

I wanted to know the designing parameters of Buckboost converter to implement it in hardware

[@abdelazeemhassan3701]

Amazing as usual, please we need the control loop for the desired output voltage

[@anowarhossen197]

Is it possible for a solar panel to get a DC output volatg (12v from 20W panel) constantly, I meant when the panel get low voltage then boost process and when high voltage then buck process to get 12V output voltage using this buck - boost circuit?

[@FoolishEngineer]

Yes, it is possible!

[@DarshaGunawardane]

Hello sir, how does this work in an electric car?

[@FoolishEngineer]

Unfortunately this is not used in Electric cars

[@DarshaGunawardane]

@@FoolishEngineer what type of dc to dc converter would you recommend that would work in an electric car? Thank you!

[@vishalwani41]

Useful information

[@FoolishEngineer]

Thanks Bhai😀

[@danielsanchez6276]

Hi friend Two things: 1: Can you explain the function of the duty cycle in the wave forms? 2: Can you do a video of buck and boost converter on a half bridge explaining the duty cycle in wave forms Thanks. o maybe you have a document where i can undertand this topics?

[@FoolishEngineer]

As of now, I don't have a document. But, you can find any white paper on the buck boost converter only.

[@GaneshJadhav-kn8mb]

If we set the output voltage to 12v and varry the input from 3.7 to 5 v will the output voltage change??

[@TB-jl9fr]

Depends if you supply enough power. Power in and power out will always be the same (of course with respect to efficiency) .

[@akashverma5756]

Fake accent disturbing me

[@FoolishEngineer]

The video is for Buck-boost converter, not to show off accent.

[@surajdabade8911]

Please explain how to calculate output voltage?

[@dr.s.swapnakumar8733]

Share the design spec.

[@FoolishEngineer]

I have not designed yet!!

[@Googlename699]

I am from Iraq, I like your video man!

[@membola]

just found, and subbed, your channel. great stuff, thanks!

[@FoolishEngineer]

Welcome aboard!

[@klausnielsen1537]

TY for sharing. A video idea vould be to show how topology can be driven with a high side driver, how to make one such driver and what the setbacks to this topology is and what other topologies have replaced it. All of that is maybe for more than one video... None the less. TY.

[@FoolishEngineer]

Thank you so much for watching!!

[@hrishikesh1137]

Sir, if we have a Source Voltage of 24 V then what should be the value of Pulse which we provide it to the Gate terminal of MOSFET and how do we calculate that.

[@FoolishEngineer]

Hi Dude, You need to use a High side MOSFET driver for this application!

[@s.5587]

I have a question regarding you saing that an buck-boost converter might be ideal for use on solar panels. Lets take a buck boost converter of input 8-40V and output of 13,8V with a maximum of 25A and a 400Ah battery. The solar panel maximum output I understood is pending on the solar intensity and also on the temparatur of the panel itself. For example on a constant solar engery input it might show on open circuit eg. 19,5Vmax at 50°C; 21Vmax at 25°C; 23Vmax at 0°C each with 0A (open circuit). The curve of the current at These temperature conditions seems almost stable over a wide range of voltage until it drops quickly to zero. The described effect I noticed from the solar panel web-simulator: www.zabex.de/mppsimulator/mpp_simu.html Also I noted, that the optimum capacity (W) output of the solar panel is changing on it´s peak depending on the panels U-I-characteristic, sun solar intensity (W/sqm) and temperatur (°C). At the same time the batteries voltage on the other end of the buck boost converter is somewhere in between 10,5V (empty) and 13,8V (full). MY QUESTION: at which working point does the buck boost converter work with such different supply / loads at both ends? Will Vout (voltage battery side) follow the batteries actual load condition of the battery and therefore decrease current Aout on 13,8V (full) to zero and increasing current to its maximum (eg up to 25A) on 10,5V (empty)? And how about the U-I-working point at the solar panel side? Will the solar panel side on voltage and current follow the maximum possible capacity (W) provided by the solar panel under its current condition (sun solar energy and temperature)? Could this electric circuit on solar panel side come on itself to a maximum of provided capacity (W) due to an optimum natural balance of voltage and current of the solar panel? I would so much appreciate if you could enlighten me on this question …..! THANK YOU

[@FoolishEngineer]

To answer your question in easy terms that, we will need to create an algorithm where the DC to DC converter will provide a maximum power at the output at any point of time, which is called as maximum power point tracking. There are multiple methods to do that. I hope this helps!!

[@laxis96]

@@FoolishEngineer How can we match the required output voltage with MPPT? If a solar panel in specific conditions has a maximum power point at 5V, but a 12V output is needed, how does this converter help? There is no voltage or current limit on the input side to keep the panel in the maximum power point, so I don't understand how that would work...

[@omartusson]

Thank you so much. This cleared so many concepts that I was confused about.

[@FoolishEngineer]

You're very welcome!

[@ultraman9083]

Hi sir FE I need your help . Pls help me, how stable my voltage from motor generator to boost converter. Because my boost converter module requires permanent voltage , but my main input supply is always changing the milliamps everytime and my peak voltage is always goes up and goes down.. Can you give me tips how to stable my motor generator output aside for fixed regulator?

[@FoolishEngineer]

I am sorry man, I can't help you but Thank you very much for watching my video

[@cobraman428]

Can i use this in a automotive application to lower voltage from 14 volts to 9 volts to lower voltage to an ignition coil? Also if the incoming voltage fluctuates between 12 and 15 volts will the output be consistent at 9 volts or will that too fluctuate? Thanks

[@isaacclark9825]

You don't need any boost for that situation so a simpler buck circuit will do.

[@cobraman428]

@@isaacclark9825 so what would you suggest to lower voltage feom 14 volts to 9 volts? A resistor or variable resistor?

[@isaacclark9825]

@@cobraman428 I would suggest a buck converter rather than a boost-buck converter.

[@francoisguyot9770]

best explanation i've watched so far! keep up the good work! thanks.

[@FoolishEngineer]

Thank you so much! Please show support to my video with Super thanks and don't forget to subscribe to our channel

[@debasischakraborty2169]

Please draw à mppt circuit of40A.

[@FoolishEngineer]

Circuit for MPPT will be the same, only control section has to be improved

[@AbdulWahid-ew7xq]

Very good explanation for a buck-boost converter but if you can make some practical circuits for more clarity that will be best. You know if a math teacher explains some math formula then after the explanation he also gives some examples. If you will make a video for some practical buck-boost circuits and attach it with this video as a playlist that will be great.

[@FoolishEngineer]

thank you for your feedback. I'll work on it

[@hadeelnaifababneh7977]

What is the mean of the Buckboost inverter type or non inverter......?

[@FoolishEngineer]

in inverting type of buck boost converter the output voltage reverses. (Check - 0:50) in non-inverting type the polarity of the voltage stays same

[@allezism1]

supper !!! thank you

[@FoolishEngineer]

Thank you so much for watching!! Please don't forget to subscribe to our channel

[@alaskanbullworm1632]

How do you connect battery at the output of the voltage is inverted?

[@FoolishEngineer]

If the output voltage is inverted, then you can.

[@simonhaesaert8175]

Is there a video on the feedback loop parameters? I need it for my exam

[@FoolishEngineer]

Not yet, sorry! working on it

[@user-pf3tq9wr4v]

Isn't Vds ~0 when Ids flows through mosfet?

[@FoolishEngineer]

Yes, It Should be '0', I am sorry I will fix it up. Thank you so much for pointing it out

[@عليعقل-ص6ث]

What is the efficiency of the buck boost converters

[@FoolishEngineer]

more than 80%

[@farrell2395]

is it the same as reverse charging if the load is battery ? is it safe?

[@FoolishEngineer]

Yes, It is safe, Many charging solutions are present based on Buck-boost converters.