Technically (if it's just about wirelessly transferring power) you could use lasers and achieve greater distances. Although the transferred power would be much lower, the distance would be much greater

@greatscottlab

2 жыл бұрын

Correct. But with my electronics background it is more about electromagnetic fields in my case.

@a6dulsalam511

2 жыл бұрын

@@greatscottlab and the laser is so direct and it could be blocked easily than electromagnetic waves ⚡

@ShahZahid

2 жыл бұрын

@@a6dulsalam511 also with a powerful laser, u have many other factors to consider like fire, blinding hazard but if u want to transmit to particular spot its the way to go and thats y many scientists think that it will be used to power spacecrafts in the future

@imagoomanwithgoo7563

2 жыл бұрын

Or a belt pulley system

@a6dulsalam511

2 жыл бұрын

@@ShahZahid That's true it's gonna be used to transmission power from the space to earth!

I am designing a wireless power transfer system right now and I had a lot of questions that your video answered for me. Great work and thank you for doing this!

Let me tell you how they achieved this: They used the same principle used in the Yagi directional antenna which means that they put resonant coils in calculated distances before and after the actively driven coil in order to extend it's transmitting lobe forward. This is of course not shown in the pictures they published 🙂

@ELECTROMAN_MX

2 жыл бұрын

how you know that?

@VladoT

2 жыл бұрын

@@ELECTROMAN_MX Because the original experiment was created by a team in Croatia which they presented it in more detail before it was continued by the american team.

@great__success

2 жыл бұрын

exactly what I thought....high gain antennas were well known even in 60's and I am talking about MHz or even GHz frequencies

@kanesmith8271

2 жыл бұрын

@@VladoT Why are they going through the effort to conceal key knowledge like that?

@VladoT

2 жыл бұрын

@@kanesmith8271 I guess there will be commercial product soon.

It seems like you should be able to improve the efficiency by placing a highly permeable sheet on the outside of the transmitter and receiver coils. Hope you will try this!

I absolutely love love love these videos Great Scott! Keep em coming!!!

@user-mt2uh1ow7d

2 жыл бұрын

shut up you just think scott is cute lol

I like your approach to problem solving in your videos, keep up the good work. Some suggestions for future IPT videos: - Try going to MHz switching frequency to maximise link efficiency (13.56 MHz is a good point overall), GaN devices can help you achieve this. - Try driving your transmitter with resonant inverters (Class E or Class EF), since they provide higher efficiency (95%+ is possible) at high frequencies and low THD . - You can get very high Q's (around 1000), by using copper plumbing tube for coils, just make sure to keep the number of turns low to minimise radiation.

Nice! I do love your sense of humour too. Keep up the good work.

Pretty interesting experiment, dude! Excellent work! 😃 Stay safe and creative there! 🖖😊

Since electromagnetic waves radiate in all directions the power available at any point away from the source will decrease with the square of the distance. This is true for typical point sources of radiation. If however, a collimated beam can be formed then the inverse square rule becomes less of a factor while aligning the beams becomes an increasingly important factor. With a collimated beam it should be possible to wirelessly transmit power over great distances at high efficiency so long as the transmitting and receiving antennas are well aligned. I used to work for Detroit Edison as a contractor in their communications department. One of the things I did in that job was to perform routine maintenance on their several microwave links between their properties. These were microwave T-1 links that were beamed between properties with low power, very high Q parabolic dish antennas.

@conorstewart2214

2 жыл бұрын

Its not so much electromagnetic waves that are transmittting power here, it is the shifting electric and magnetic fields. The fields arent particularly easy to direct which is why transformer design is finding the optimal design that minimises losses. Wireless power transfer is pretty much just a transformer without a core at a distance, all things you want to avoid in conventional transformer design. As far as I know its not that easy to change the shape of the field into a beam or change it much at all as the field naturally makes a loop but as someone else in the comments pointed out they most likely used other coils to stretch the field out and therefore give it more range.

@MrBrelindm

2 жыл бұрын

@@conorstewart2214 you would be amazed at all of the beam forming techniques there are in designing an antenna or antenna system. And basically any "wireless" transmission is radiated from one antenna to another so in order to maximizing the efficiency of long distance power transmission, applying beam forming technology is highly advised. Having several coils stacked with one driven coil, and at least 1 reflector coil, and a couple of director coils would offer a narrow cone of directed radiation - a beam lobe. Typically the more elements in a beam antenna system, the tighter the beam lobe, higher the antenna gain, and higher the Q. Of course the higher the frequency used, the smaller the antenna design needs to be. Something like I described above would obviously be a high frequency circuit and could be set in a resin pour to maintain the optimal wavelength distance between the different types of coils (beam elements) in the antenna. Another useful area of study in antenna design (I'm a former Navy radar tech) is waveguide theory. The higher the frequency used, the easier it is to produce a collimated beam of radiation.

@conorstewart2214

2 жыл бұрын

@@MrBrelindm sorry we might just be thinking differently but it seems at least in part you are talking about antennas and beam forming like the ones used for radio transmissions which is very different from the coils used in wireless power transfer which don't transfer energy through EM waves. Beam forming and long distance transmission through EM waves is totally different and doesn't really apply to wireless power transfer. Radios send out EM waves but wireless power transfer coils don't emit particles or waves like standard antennas do.

@MrBrelindm

2 жыл бұрын

@@conorstewart2214 the coils used are identical in the video and are placed some distance apart in open air. Alternating (or pulsing direct current) is applied. It radiates and the other coil is energized. That's electromagnetic propagation between the coils. When you're talking about EM propagation, you are talking about antenna design.

@evensgrey

2 жыл бұрын

The simple kind of power transfer used in things like Qi Chargers for phones or for electric toothbrushes use direct magnetic coupling of the transmission and reception coils. Magnetic field strength (once you're at a distance from the generating current loop that is large compared to the loop size) goes as the inverse cube of distance. (Closer than that, magnetic field strength is weird, and becomes dominated by additional terms in the field equations that fall off even faster with distance. If you're at a small enough distance from the generating coil, the field is as close to uniform as you want. Generally speaking, these power transfer systems have the coils much less than their own diameter apart, so the actual fields are really complicated, but transfer power with enough efficiency to be quite useful.)

always fascinated the way you explain things.

Alter du hast schon 1,5 Millionen Abonnenten. Herzlichen glückwunsch. Habe mir deine Videos schon reingezogen seitdem du gerade mal ein paar tausend hattest.

Thanks for sharing this, I enjoyed the learning experience here.

Love the this channel!! I have been watching for quit some and trying to teach myself alot is still an alien language but you always inspire me to learn more so one day I can understand what you were talking about.

@greatscottlab

2 жыл бұрын

You can do it!

@dougcox835

2 жыл бұрын

Just remember shat when he says something is serious he really means series.

@WarriorRev6300

2 жыл бұрын

I watched 3/4th the videos of this channel.

Fantastic as always!

Love your projects/videos..

@greatscottlab

2 жыл бұрын

Thanks :-)

Really loving the content!

One of my favourite youtuber. Greatscott

Its nice, how he writes things down along with narration

Nice vid, learned a lot, you should do more experimental videos like this

11:17 - so... next time, then!

@Hex-Mas

2 жыл бұрын

so how much was that amd video card you bought?

@ezzeldin101

2 жыл бұрын

I like Jeff videos

@JeffGeerling

2 жыл бұрын

@@Hex-Mas Got it at MSRP!

@aidan7913

2 жыл бұрын

@@JeffGeerling amazing! how did you manage that?

@512mb4

2 жыл бұрын

Make a wireless pi to cook a pie then , with a timelapse

Great sir 🔥 Vielen Dank für das sind alles Informationen. 😊

Another Great (Scott) video!! I'm intrigued by wireless charging/transmission. Also, I really like your handwriting. I'm sure you've heard that before.

loved this one mate.

great video, as usual, years since I am watching you and you have helped me a lot to get a bachelors degree.

Loving the new intro style!!

Amazing experiment. 👌👌wishing you all success. 👍

Excellent video. Keep it up!!

Another well thought out video 👍

@GreatScott u r truly great !!

Really cool experiment 🐱 thanks for sharing 👍

You're the best 🤩👍🏻

@greatscottlab

2 жыл бұрын

You're breathtaking ;-)

As always, great sir.

Thanks for the interesting video! Maybe a metal detector would be a nice project to experiment further with transmit / receive coils.

ur the best teacher i have ever seen thanks bro 😍 😍

Very nice job! Really interesting! Thanks for your work!

@greatscottlab

2 жыл бұрын

Many thanks!

Love your videos !

ur videos are the most detailed videos I have ever seen!!!

@greatscottlab

2 жыл бұрын

Thank you ;-)

Scott, what about using a MPPT to track ideal point of the coil and thus produce maximum power?

Haha I love that you are branching out in your acting! *challenge accepted* Always love your work!

You're awesome! Love your videos, thank you👍

Excellent video!

Thank You for making this video !!!!!!!!!!

Great stuff Scott, thanks

@greatscottlab

2 жыл бұрын

Glad you enjoyed it

The MIT has some brilliant minds and money for research... I think that it's very difficult (or almost impossible) to replicate their results with the resources that most of us have... even in the university (my case). But, as always, this was a very interesting video. I usually share them with my students and other professors at the university. Thanks for your time and dedication!

I always wanted a way to transfer power through a window or glass sliding door. Ive rented apartments before that didnt have a outlet outside and i wanted to plug in a light or something. Theres nothing like that on the market but i think it would be a great idea for a product. I think the technology is there for this, someones just got to do it.

Super interesting, thanks!

Please look at the magnetic loop antenna designs for reference.. Some of them use the coax shield for the loop, because of the skin effect is very efficient. They are also very simple, you only need the coax cable and a tunable high voltage capacitor that varies the frequency.

Hi greatscot great experiment. I already developed a WPT system a month ago that is without microcontroller and that can send power with 40% efficiency. And power up from 7.5V battery🔋/power supply. The distance I achived about 30-40mm.

great as always

Nice video .This is a topic I really like!

@greatscottlab

2 жыл бұрын

Glad to hear :-)

I might study elektrotechnik when I finish from school, and you were one of the youtubers who taught me alot, thank you!

@greatscottlab

2 жыл бұрын

Happy to hear that!

@samarthguleria788

2 жыл бұрын

Same here

Variations between capacitance and inductance for the same frequency also matters. Your load impedance also makes difference.

i love coming to your videos, your are amazing

@greatscottlab

2 жыл бұрын

Glad you like them!

Hello, Great Scott. Great to see your extensive experimentation with wireless power transmission. I have a question to ask you now. I reproduced the H-bridge drive circuit exactly as shown in your video, but when I connect LC in series to the circuit, even if a small VCC is given, such as 2V, the current can be close to 1A, which is consistent with a short circuit. The resonant capacitor is also overwhelmed, and the pin is almost in a state of fusing. How can I use it correctly to generate resonance?

I am wondering if you can rewind coils on a go kart engine to generate more power where most stock systems only make 3 amps. Thinking of a predator 212 with a charging kit installed to it. With what some of us want to do is have lights so we can do late night rides but its not feasible with that kind of power output. I figure you are the best person to ask for this question. Thanks

Wow you discover the radio!!

Forgive me if my thinking is wrong here but, the output coil is kind of like a dipole, where the electric charges are equal on opposite sides. I wonder if you can use a radiator like a on a Yagi antenna to push the unused electric charges to the other side and have more output from the coil...in one direction ?

@bobnick9892

2 жыл бұрын

That's a great idea !

corporation: here's a charger that's half as efficient, 4 times slower, 10 tiems more expensive and it doesnt allow you to use your phone while chargin, but it's kinda cool. everyone: **deal**

@theodiscusgaming3909

2 жыл бұрын

The power of marketing.

@rpavlik1

2 жыл бұрын

Kids can't break your phone's charging port if you aren't using a charging port.

@evensgrey

2 жыл бұрын

@@theodiscusgaming3909 None of the people behind those charging systems are good enough at marketing to get people to bite something that obviously crappy. I think most engineers they interview look at the thing they want them to build and say to themselves, "I don't want to have THIS on my resume!"

@arthurmoore9488

2 жыл бұрын

You're forgetting the most important part. Just toss your phone on a particular spot and it's charged when you're ready to use it. Wired charging is still extremely valuable, but I don't use my phone while sleeping and it's "good enough." To not have to plug in a cable every night.

@s.sradon9782

2 жыл бұрын

@@arthurmoore9488 I just have my cable organized so it takes no more effort to plug in and it stays in.

Excellent

Love your detailed experiments! The whole subject of wireless power strikes me as a prime example of "convenience culture" - a highly inefficient and horrendously complex idea promises to replace a 99.999% efficient $0.50 charging cable that we are just too lazy to plug in.

@blogiblogowicz574

2 жыл бұрын

you are forgetting that there is a wired charger attached to your 99.999% efficient plug (at least AC/DC conversion) - at the end of the day, if propely aligned, wireless charging isnt considerably worse (90%+)

@Gooberslot

2 жыл бұрын

@@blogiblogowicz574 Wireless charging also has an AC/DC conversion since the wireless charging transmits AC power. In fact, there's probably even more AC/DC conversions since I doubt you're running the charger directly off of mains voltage.

@blogiblogowicz574

2 жыл бұрын

@@Gooberslot correct. both have PFC + HF inverter (as in ~100kHz, dont think MHz) + rectifier. The only difference is the magnetics inbetween, which isnt as inefficient as one might think, if properly designed.

@iskandarsyah9624

2 жыл бұрын

Look at this for your wireless "charging" on steroids: kzread.info/dash/bejne/fJyt0tuIhb2YqMo.html

@blogiblogowicz574

2 жыл бұрын

@@iskandarsyah9624 ahm.. as soon as I read about "overunitiy" I kinda stopped paying attention.

Nice! You built a long wave transmitter

Ventures into the unknown require sheer will. Its an inspiration to watch you.

great doing!hello from Belarus!

Good job!

Hey Great Scott, wanted to ask about the sponsor for electronic magazines? You have any you could recommend?

such a small current loop, relative to the wavelength, actually acts like an omidirectional antenna on the far field and radiates the more to its side than to its middle... While you're in near field your system works, but in the moment the distance increases enough you end up in the direction where your antenna radiates the least. One way of possibly solving this is adding some sort of ferromagnetic material to the middle of the coil, so that the wavelength that matters is the one inside the material (or somewhere in between that and the one in vacuum because the coil won't be fully embedded in the material). When the perimeter of the loop is close to the wavelength (in the ferromagnetic material) then you get a directional antenna

Great experiment.

great video! super channel!

Love From India 😍😍😍 Awesome Content Bro

How do you begin to learn this stuff?

can you make a video about a fully functonal wireless lithium ion battery charger with a small coil like 6 to 7 cm?

Great 👍🏼 Scott !!!

@greatscottlab

2 жыл бұрын

Thanks 👍

Did you measure the magnetizing current of the primary side?

Have you tried resonant rlc circuits? Use variable capacitor, var. Resistor and var. Inductor to tune. As distance increases so does the resistance so it changes the frequency. You will have to keep tuning until resonance occurs. Dual tuning forks show the same effect

You are you electronics GOD of youtube dude!

If you wanted to carry this experiment further in the future, you could add variable capacitors (preferably controlled via microcontroller) and then set up tests that will sweep through frequencies and capacitances until you get your maximum power throughput for given coil specs. Should be able to create some nice graphs similar to the ones for the commercial coils.

@americamartinez5339

Жыл бұрын

do these controlled capacitors have a special name?

The handwriting is so satisfying and the way he simply explains stuff is so amazing

I love your videos!

ah man i was waiting for this video

@greatscottlab

2 жыл бұрын

I hope you will enjoy it :-)

Very interesting!

Theses systems emites in all directions. It can be interesting to use directional antenna at emitter and receiver for concentrate the electromagnetic wave

Nice video. What is the frequency of the induced current. If it is the order of MHz or kilo Hz, it can only light up filament devices. As sophisticated home appliances run on 50-60 Hz

Cool Project!

@greatscottlab

2 жыл бұрын

Thanks :-)

Great video

I will definitely check out those older videos of yours! By the way... Would you ever build a plasma globe with tesla coil or just a simple flyback driver circuit?

@greatscottlab

2 жыл бұрын

Great! Eventually I can do that.

@Purple431

2 жыл бұрын

Nice

You could attain much higher frequencies using GaN fets. If you take care in choosing the core of your magnetics (To bring down core losses), you can have a very compact design

I am curious if stranded v. solid copper wiring in the coil make a difference. Or maybe even each coil being a different wire? There is something i heard about high frequency and skinning effect. I think that might be an advantage for the transmitter coil in the high MHz+ frequency range, and maybe solid or stranded receiver coil doesn't matter? Love the video, as always, i am left more curious than before watching, and i now know a lot more. Thanks 😊 and keep it up.

Great work ...

@greatscottlab

2 жыл бұрын

Thank you! Cheers!

3:41 you are using Half Bridge with just single Supply so you are applying only half of the power to it instead you can improve it with Dual supply but It still can be possible with Single supply with relatively higher voltage by using Two Large Electrolyte cap in series will supply lines and Cap's center point Connected to the Centre point of Half bridge Through Load in between similar to Smps Circuit ( push-Pull Configuration . ) .

Thanks for great video, please make emergency inverter bulb circuit with fast charging , typical emergency bulb in market takes 8 hrs to charge.

Hi.. Do you know that physical antenna for long distance wifi, how about you put them on the center of your big coil at both transmitter and receiver.. i thing it may can add distance a bit..

Is there anyway to create a cone or tapered coil? Wouldn't the electromagnetic induction be focused out the tip of the cone maybe giving it more reach and or strength?

Based on my practical experience with amateur radio, skin effect isn't a major issue up to several megahertz. My kilowatt amplifier uses inductors made of copper tubing above 20 mhz.

Hello GreatScott, you need some simple machnical apparatus for this experiment. I am sure it will give more encouraging results.

Curious and fascinating (and OLD; Tesla worked on this theory a century ago). I'm wondering; could two independent transmitters increase the distance or power? Seems like it could, but I'm also thinking that some phase-locking would be helpful at the transmitters, so that they transmit at the same frequency AND phase. Would this reduce interference patterns in the EM field?

Do you think in future can transfer electricity tenth of meter wireless, and what about using high voltage kv in transfer coil.

This wireless power system thing is old ... when I was I child my dad built a small AM radio that was powered by it's own antenna! It was awesome the way it works due it was using the radio signal to power on the little circuit! And tha was on 86's ....

@jimmyb1451

2 жыл бұрын

@@flexairz Received, yes. Kw transmitted. Which is why "wireless power" is such a waste of time.

@AhmedAli-op6ng

2 жыл бұрын

@@jimmyb1451 not really it is the future of EV ( TAXIS etc) search more about it. Some companies even claims and have tested it to as efficient as 94% for bulk of power more than 50 KW.

@reverse_engineered

2 жыл бұрын

That AM radio managed to recover milliwatts of power from a transmitter putting out many kilowatts. That's fine for transmitting information, but it's extremely inefficient for transmitting power. All modern radio devices (e.g. mobile phones, Wi-Fi) perform in much the same way, though often with more directed and efficient methods. But still, the receiver receives only a very small fraction of the power transmitted. The goal behind wireless power transmission is to receive a large portion of the transmitted power over a considerable distance, not just some tiny fraction of it.

To get the best efficiency and distance you need those coils to be accurately tuned to be resonant at the frequency being transmitted and received And you want the antennas (coils) to be as directional as possible as that will increase signal strength at range.. Look to Ham radio antenna theories, You may be getting more power reflected back at your transmitter from your coil than is being radiated by it.

could you use a Halbach array to maximize the energy moving towards the receiver

I wrote an IEEE paper back in 2012 on wireless energy transfer using planer transformers & our method showed far better efficiency and better control. The Key is achieving resonance between the Tx and Rx coils.