Intuitive explanation of the Dual Active Bridge (DAB)

Most relevant paper
Evzelman, M., Zeltser, I., and Ben-Yaakov, S., DSP control of gyrator-behaved switch mode converter. European DSP Education & Research Symposium, EDERS-2008, 249-256, Tel-Aviv, Israel, 2008.
Download:
www.ee.bgu.ac.i...
Also relevant
An overall study of a Dual Active Bridge for bidirectional DC/DC conversion
Alberto Rodríguez Alonso, Javier Sebastian Student,
Diego G. Lamar, Marta M. Hernando, Aitor Vazquez;
2010
General Analysis of Switching Modes in a Dual Active Bridge with Triple Phase Shift Modulation
Carlos Calderon , Andres Barrado , Alba Rodriguez , Pedro Alou , Antonio Lazar , Cristina Fernandez, and Pablo Zumel
2018

[@hhao0011]

Dear professor, this is the best power electronic channel on TH-cam. Thank you very much.

[@sambenyaakov]

Thanks😊

[@sachinchauhan8936]

Thank you Sir,
I used to follow your lectures for my basic understanding, but this lecture was seriously unexpected and surprising for me. As I am also working on this converter. So thank you once again Sir.

[@sambenyaakov]

Thanks Sachin. Comments like yours keeps me going😊

[@smithlancelot5745]

Hi Sachin, do you mind sharing your work, I am working on a Dc Dc converter for fast charging car

[@robson6285]

What a great and interesting circuit to hear all that insights from. So many details in this lesson are later usefull on their own in other builts. I love your video's so full of knowledge and so good to follow and understand. You are a great teacher and with a schematic like this i can enjoy learning more than ever. And its easier because you can pauze en go a bit back in such a videolesson! O i mean to say: thanx, again!

[@YoniLiron]

Thanks Professor Ben-Yaakov. Great explanation.

[@sambenyaakov]

Thanks

[@zaikindenis1775]

Thank you for the video! I am using it now for the practical design of the converter. But I found if we define d=tph/Ts, the formula for g should be corrected as follows: g=Ts*(1-2*d)*d/(n*L), which corresponds to 90 degrees (d=1/4) for maximum value like in the picture from your video. Thank you.

[@sambenyaakov]

Thanks

[@olivalle]

Thanks for your very intersting presentation as usual,. We find a lot of vague explanation over the web but few very sharp enough

[@sambenyaakov]

Thanks

[@lorenzostobbione5571]

Thank you for your presentation, it really gave me a very good overview of this important topology.

[@sambenyaakov]

Thanks for comment.

[@jigyasakumari9477]

@@sambenyaakov good evening sir ..my ist doubt is transformer will work on square wave ?? What's the advantage of this squares wave ?? Nd what's the advantage of phase shift ??

[@satishchandrabs4649]

Respected Dr. Sam Ben Yaakov,
I am Satish Chandra BS, pursuing M.Tech., in Power Electronics at NIT-Trichy, Tamilnadu, India.
At Present, I would like to do my project on DAB Converters and want to work upon it further.
This helped me so much for building basic understanding upon it.
Thank You So Much as well It's Great to see your responses for the comments, truly appreciable Sir.

[@sambenyaakov]

Thanks for comment. Good luck with your design.

[@yadukrishnanm6280]

Dear Professor, thank you so much for this video. It was a wonderful explanation. Can you please post a simulation video of SPS and DPS control of DAB as well?

[@sambenyaakov]

Good suggestion. Will try.

[@nagendrabadiger3001]

Hello Professor,
This is so far the best explanation I have come across. Awesome work, I would love to see more of your talks and technical insights in the future. I'm eagerly looking forward to your next tutorial/talk on resonant topology. Best regards, Nagendra.

[@sambenyaakov]

Thank you. Look up my TH-cam channel "sam ben-yaakov" for more related videos.

[@dr.raghavendra5154]

Dear Professor, Many Thanks for the useful information.

[@sambenyaakov]

Thanks

[@mfaisalfiaz]

Thank you, Professor, for a very well elaborated explanation of the DAB. Can you please explain the other two modulation techniques of DAB (DPS and TPS) and the output current equations for each technique?

[@sambenyaakov]

Will try to post a supplement in the future

[@alg21343]

Thank you a lot prof for the shared valuable informations related to DAB. My questions are the followings:
1- is it possible to implement the voltage-fed or current-fed DAB without blocking capacitor in series with the leakage inductor?
2- Among the mention modulation schemes which one is recommended for reducing the circulating current with extended ZVS range.
Thank you once again prof.

[@sambenyaakov]

Hi Hamza,
Thanks for conversation.
1. Yes is is possible, a blocking capacitor is not needed
2. The basic phase shift DAB does not have circulating current (like the phase shifted PWM). There is no duration in which the inductor current is locked into a short.
Best.

[@Dwijasish]

Thank you so much sir for this wonderful explanation. I am actually developing the hardware setup of dual active bridge in the laboratory. I/P is 300V DC and o/p is 225 VDC (transformer turns ratio is 1:0.75). I am observing that power transfer is possible for a resistive load at the output with no delay between the pulses for the two H-Bridges. Can you please give an insight of the circuit when no delay is given, and how power transfer is possible with resistive load at open loop with no delay.

[@sambenyaakov]

Foer resistive load the system beeves like a transformer which does not store energy

[@sc0or]

One thing immediately appears. In the left and right legs we have to use very different mosfets (or even mosfet and igbt). I doubt we can use a same controller for the whole system (I don’t mean drivers, but a controller exactly). How to sync boost, soft-start, dead times, etc if we spread a phase shifting mechanism over a bridge?…
Another thing.. What is an advantage comparing to a classical two secondary coils + sync rectifier architecture? I see twice more expensive transistors and a doubled heat losses.
Modern TI full bridge phase shift zvs controllers do their job great at only one side of s bridge

[@sambenyaakov]

As compared to phase shift: DAB is bidirectional and has a wider range of voltage ratios with ZVS.

[@sc0or]

@@sambenyaakov I see. Thank you. May be DAB is good for green energy invertors and backup-solutions. That's not my case, excuse me.

[@robson6285]

Ha, this lesson could be especially made for me, so good fits the just learned knowledge my needs for the built i am working on for the last months!

[@sambenyaakov]

Thanks Bob. Happy to learn that you can put the knowledge to work.

[@siddhikadam3092]

Hello Sir. Thank you for such a great explanation. I had a doubt. What is the critical role of the inductor in this scenario? I understand that it performs the current reset or more accurately zero crossings and is an essential part of maintaining the system stability. But exactly how does it do that? Also, what would happen if the inductor was taken out?

[@sambenyaakov]

Hi Siddhi, this is a good question. Please post it at the LinkedIn group I am managing ( www.linkedin.com/groups/13606756 , you need to ask to be a member and I will accept). This way others will benefit from my answer and perhps others will respond. Thanks.

[@siddhikadam3092]

@@sambenyaakov Yes sir. Thank you so much for your response.

[@minhokim8263]

Long time, no see. How are you, sir? Hope everything goes well with you and thank you for the excellent lecture.
My question is about your definition of DTs in the figure on the video 22:10. I think it is DTs/2 instead of DTs. So does d=2*tph/Ts otherwise the first equation of I1 doesn't hold.

[@sambenyaakov]

Please have a look at www.ee.bgu.ac.il/~pel/pdf-files/conf130.pdf

[@leohash]

Sorry, but, Is it possible that the equation of g has a typo? I think the correct equation is g = (Ts*(1-2d)*d)/(n*L). I agree, best power electronics channel. Thank you professor.

[@leohash]

Sorry, I did not read previous comments,😅

[@sambenyaakov]

👍

[@manojr4762]

Hi Professor. Thanks for the lecturer. At time 13.49 explains the I2 current will be same as IL with zero phase shift. How this is possible. I see I2 as sawtooth rather than triangle waveform with zero phase shift . However I agree the average current is zero.

[@AndreaOrozco-Sanchez]

What kind of diode rectifiers are used? Half, Full wave, or full wave bridge?

[@sambenyaakov]

? please indicate the minute or slide number you are referring to.

[@AshokRaja-o4r]

Hello Professor, I have some Questions.
1) For resistive load, if there is no delay between the gate pulses than can we say that the DAB will act like Phase Shifted Full Bridge?
2) For the same resistive load, if the secondary Bridges are operated with some phase delay then what is the impact on circuit operation?

[@sambenyaakov]

What do you mean resistive load? No output capacitor?

[@urajendra143]

Dear professor, Thanks for the explanation and could you please also explain how to generate the pulses for V2G applications, or could you please suggest a good reference for the same if possible. Thank you sir.

[@sambenyaakov]

Look up application note of manufacturers some have relevant information.

[@ubaidahmad571]

Thank you, professor. It will be more interesting if you add input and output capacitor design in your upcoming lectures. Thanks in advance.

[@sambenyaakov]

Thanks. Look up my TH-cam channels , there are some videos related to capacitors, In TH-cam search window look for " ben-Yaakov capacitor"

[@maxw2572]

Thank you for this informative video :-)

[@sambenyaakov]

Thanks

[@johnhajdu4276]

I am missing the fact, that during the presentation the saturation of inductor or transformer was not mentioned.

[@sambenyaakov]

Thanks for comment. These are important and crucial issues but the video is just a primer. Look up my TH-cam channel, it includes many videos on inductor and transformer designs.

[@ceelo8663]

Thanks for the explanation Prof ! One question, if I were to express the average input current I(ia), would it simply be the average inductor current multiplied by 0.5 (proportion in a a switching period where S1 is ON)?

[@sambenyaakov]

Average during the period the switch is on (not average over period) since you are sailing the inductor at that time.

[@Dr.H.I]

Thank you very much professor for this course. I have a question for you please, so what is the difference between a dual active bridge and a solid state transformer ? thank you.

[@sambenyaakov]

Solid state transformer is a is generic name. One way to design it is by ADB

[@VasanthBattula]

Respected Professor is DAB is suitable to connect MW scale PV system to HVDC Transmission system please help me in this regard for simulation of DAB in MATLAB

[@sambenyaakov]

For very high power it would be better to use everal units in parallel. Sorry for not being able to help you with MATLAB simulation.

[@arunij8339]

Dear professor, is there any second part for this lecture?

[@sambenyaakov]

Not yet.

[@xichenjiang7799]

@14:03, should the second segment of blue line depicting I2 be sloping upwards? I2=-IL?

[@sambenyaakov]

Not sure what you mean.

[@xichenjiang7799]

@@sambenyaakov When Qb1 and Qb4 are on, then I2=IL so the two lines are the same. When Qb2 and Qb3 are on, then I2=-IL. Thanks for all the great videos by the way.

[@sambenyaakov]

@@xichenjiang7799 Isn't that what is shown? I2=-IL? Or am I missing something?

[@xichenjiang7799]

@@sambenyaakov @14:03, you show that I2=IL, along with the switching plots for Qb1, Qb4, and Qb2, Qb3. When Qb1 and Qb4 are on, then I2=IL so the two lines (red and blue) are the same, which is what you have shown on your plot. However, when Qb2 and Qb3 are on, then I2=-IL, so the blue line depicting I2 should have a positive slope while IL has a negative slope. I think you drew I2=IL when Qb2 and Qb3 are on. Is that correct?

[@sambenyaakov]

@@xichenjiang7799 I really don't follow you. Never mind the slope. when Qb2 and Qb3 are on, then at any given time I2=-IL, (mirror across the time axis)

[@nancircle5566]

Thank you very much!

[@sambenyaakov]

Thanks

[@grigoreman7198]

Nice, thank you!

[@sambenyaakov]

Thanks

[@munuryldrm5013]

Hello Professor. I bought Dual Active Bridge (DAB) as a design project, I am doing research, can you suggest written sources that I can use on this subject, thank you in advance.

[@sambenyaakov]

I am not aware of a practical text book on that. But there are some papers that could be useful

[@munuryldrm5013]

@@sambenyaakov Thank you for your feedback and I would be very happy if you could finally share the link to the article you found useful.

[@Ayushchauhan-wi5pl]

How to calculate transfer function of DAB using SPS method ?

[@jharnamondal7960]

Is resonance DAB LLC dcdc converter?

[@sambenyaakov]

No . It is a quasi resonant converter..

[@davidebagnara6769]

Thank you Sir.

[@sambenyaakov]

👍

[@VasanthBattula]

Dear professor, my question is which type of DC DC converter have high voltage gain (DAB, Modular Multilevel converter) to connect MW scale off shore pv plant to HVDC transmissions system.

[@sambenyaakov]

This is a too general question. And by the way, with or without insulation?

[@nidhinrajan27]

How to design the DAB for a particular gain? eg if I need to connect between 12V and 400V. Is the gain dependant on the turns ratio?

[@sambenyaakov]

The gain is primarily by turns ratio. Modulation adds a litttle . Hard switching in step up mode.

[@ahmetcan1229]

great explanation

[@sambenyaakov]

👍🙏

[@ahmetcan1229]

​@@sambenyaakov Albert Einstein most famously said “If you can't explain it to a six-year-old, you don't understand it yourself.” You have proven that you really have grasped a solid understanding about the topic and explain it to even a person who are not good at this field.

[@sambenyaakov]

​@@ahmetcan1229 I am far from being Einstein but it has been my experience that this is absolutely true. If the answer starts with "well this is complicated.." you know the guy does not know a thing about the subject.

[@nitya7670]

How to calculate maximum leakage inductance?

[@sambenyaakov]

You can use Dowel method

[@nitya7670]

@@sambenyaakov Thank you

[@VasanthBattula]

Respected professor What is the maximum voltage gain of the converter, suggest reference materials for simulation

[@sambenyaakov]

Practical gain range is up to, say, 1.5.- 2. But above one the efficiency goes down. Sorry about not being to help you on references.

[@VinayKumar-nd4qf]

sir in case of isolated DAB how to design the transformer please let us know sir

[@sambenyaakov]

See th-cam.com/video/3nfqBzPMknY/w-d-xo.html

[@VinayKumar-nd4qf]

@@sambenyaakov thank you so much sir🙏🙏

[@mohamedelshenawy5054]

do u have this Matlab simulation for isolated type, please?

[@sambenyaakov]

No

[@mohamedelshenawy5054]

@@sambenyaakov
Can u guide me for good choice of parameters for fast electric vehicle battery charger

[@thanadthasainak8547]

Thank you very much.