How Qi Wireless Charging Works
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- čas přidán 15. 10. 2015
- I thought I would get into the fun physics of how wireless charging works. It's actually dead simple, or at least I think so. It's all about electromagnetic induction.
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Sometimes I have to double check and make sure this is a ThioJoeTech video and not a ThioJoe video.
+imaninja187 Same!
If you're smart enough you don't have to though
Alright, I'm not smart then!
Lol same
+imaninja187 same
in case anyone wants to know: it's the magnetism itself (from the primary coil in the charging base) that causes the electrons in the copper wire in the phones secondary coil to move. This interaction of magnets and electrons can also be seen when you place a magnet next to an old TV screen (CRT - cathode ray tube, which is a beam of electrons). The important point here is that the primaries magnetic field is constant changing due to the Alternating Current (AC) going through it. This causes the electrons in the secondary coil to actually move (have a positional offset in sync with the strength of the changing field) in a back and forth manner, rather then at a fixed position by simply placing a magnet on it. This alternating magnetic field has the exact same effect as passing a moving magnet near a coil of wire. This motion of the electrons within the secondary copper coil is the cause of current flow (moving electrons). For those that want more details on the AC to DC conversion process, one method is to use a bridge rectifier, consisting of 4 diodes arranged in a square shape (look in google images for example). A diode will only allow electrons to flow in 1 direction. There are 2 diodes from each AC input each pointing in the opposite direction but on the other AC terminal the 2 diodes are reversed. The 2 top ends and join and the 2 bottom ends join. so whichever way the current is going, there will always be a pair of diagonally opposite diodes conducting. google falstad Full-Wave Rectifier to see a simulation of one in action.
Thanks so much for this explanation. I never really thought about how this is possible, and most of the information in the video was brand new to me, and you explained it really well. It all made perfect sense. Thank you!
Clear, smart and simple. Nice work! :)
Awesome video, cool stuff. How about a USB type C connector & USB 3.0 video explaining how it can have higher bandwidth, be split and do power vs USB 2.0
qi is the life force all around us and the energy that fills the universe
that was actually something I never thought about. good work! one of the points I think you didn't make clear though is that what happens in the energy transfer. power from the wall goes to the charging plate and is converted to indirectional magnetism. when the coil in the phone comes within the proximity needed, the magnetic field focuses and excites magnetism in the phone. the phone coil then converts it back to electricity. also I have studied the technology and have written a paper on how it may not be able to advance in efficiency for a long time. not really sure what to do with it though.
Great video, simple straight and rich!
Easy and very clear for understanding! Thank you!
Thank you! Good job explaining it in a way that's more understandable! 👍🏼
Thanks Joe. Although i didnt get everything the first time watching this but this video covers thr gist of all the principles involved. I had to watch it 3-4 times (jumping back and forth to referring back to the diagrams in the beginnning) to get it.
Very good. Next vid should be about Santa Claus and the flying sleigh, please.
Again, it's so hard to take idiots seriously...I spy with my little eye...
Wow! I like to think that I am really smart. I even went to college for electronics. I guess you just explained it better. Thank you!!! I finally learned something new! You are awesome Joe
Real easy to understand bro! Great job
awesome stuff brother. very education. keep this stuff up
Thanks for this video. It really cleared up my query of the science behind Qi chargers
thanks for the cool video. just beginning to learn about wireless charging because of a tech job I took on and your explanation is easy to follow also because of the graphics.
Thank you. Brilliantly explained.
Great video bro, really drove home that point at the end. haha. Thanks...really helped my explanation to my wife.
Great explanation, thanks!
Well explained. Other videos don't mention the appliance battery state, and how the inductive charge 'refreshes' the electron (power) state
Thanks, very much easy to understand explanation
Thanks man this was really cool information.
Brilliant Thio. Can I assume then that if I apply iQ receiver to the back of my iPhone 6 I can use it in my Mercedes wireless charging area?
Thanks
Jim
Wireless Qi Charging is the best accessory I have for my phone TY for the Video
I leave now that much smarter. Thanks thiojoe!!! Thumbs up.
awesome explanation sir. Appreciate the education.
Do you recommend and educational resources with simple explanations like this? Thanks!
So, would a strong magnetic mount for a phone disrupt the charging process if used at the same time?
hi.. im interested in your video. could you please explain more specifically about how transformer, inductive coupling and reosnant work in wireless charger/ inductive charger
This was a relatively simple explanation and yet made things quite clear. Thank you! :)
It's a great video.
Froma design point of view, I'd make sure there is a tiny bit more space above your head in the video. Just a little slightly opinionated tip. But truly, the content was great! :D
Awesome explanation
I usually think of the electrons in a battery like water between two glasses and a straw that connects them
The for the video mate
Nice one
nicely described. thanks
Awesome job thanks man
By analogy, when you listen to this vid, your ear drum moves, & although the sound travels at ~1000fps, no air molecules move from your speaker to your ear, only the vibrations. Similarly, the vibrating (alternating) current in the sending coil creates a big alternating field (magnetic wave), and the big alternating field creates an identical (but smaller) alternating current in the 'listening' coil.
is it possible to be able to charge your phone over a small distance or area were the wireless charger could be plugged on the wall and you could just be sitting in a near distance...
This is more like an overview on how ALL wireless charging works. Qi in this case uses a communications protocol as well to talk to the charger. This is why a Qi charger is just pulsing the field now and then until you put something Qi-capable/compatible in it. Until then it has not gotten confirmation it is ok to output much power.
The receiving unit can ask for more or less power through this protocol and even tell the charger how far it has gotten on it's state of charge!
Curious question the charger that you use to charge AAA batteries or AA can you make that into a wireless charger for a phone?
Thank you for the reminder
I’m not a scientist at all but your explanation made perfect sense to me. Thanks!
That helped. Thanks! :)
very good stuff
great video
just say air core transformer. btw will it charge on induction cooker and can i charge my phone trough the nfc antenna with zvs induction heater or some other shit. are there wave frequency limits
usefull video to uderstand the concept
i didn't realise it was this simple and that makes me surprised that wireless charging hasn't been around for longer
1:02 Wire with current running thru it has a magnetic field (induced) around it, not actually an "EM field" (you included an Electric field, incorrectly).
Very informative.
Brilliant explanation.
is it an electro-magnetic field or just an electro-magnetic wave (since it's triggered by alternating current ) that transfers energy (but not mass) in the phone ?
* crickets chirp * ..... WIIITCH! WIIITCH! BURN IT AT THE STAKE!
BRO UR GORGEOUS AFFFFF
Nice. Good video
Super interesting!
A good way to explain how charging a battery works is think of rolling a ball up a hill, when it’s up top it has a lot of potential energy and it loses it as it goes down. Then to charge the Potential energy it we have to roll it back up
… Well, I think you did a good job; the only thing I would’ve suggested you add is to point out that this transfer of energy is happening through the electromagnetic field that the entire earth is immersed in that is generated by a molten iron core that is spinning… That in itself is mind-boggling, but, it’s the same as radio waves’ ability to travel over distances as regular disturbances in the electric field , disturbances obey the laws of physics as they apply to waves.… Like ripples on a pond. It is also the force field around the earth that deflects all kinds of cosmic rays, x-rays other forms of radiation that would be very dangerous. I liked your water container analogy; the storage and movement of water is actually a really good way to understand electricity.… For example, voltage is defined as electromotive force, that is how bad the electrons want to get from where they are to somewhere else… Potential ... so the analog in Would be pressure. This could be because the water is in a water tower or behind a dam, or is being pushed by a pump etc. so you could think of voltage as electrical pressure. … Similarly, water flowing through a pipe or a hose or down a ditch or in a river all have analogues to electrical flow. In the same way water Under very high pressure going through a needle size orifice can be powerful enough to cut steel, but might use a surprisingly small amount of water… That would be the analog of a high voltage flow but with not a lot of amperage. Amperage would be more like the diameter of the hose, the depth of the ditch, or the width of the river. The amount of work that can be done by a flow of water is measured in whites, and the formula for whites is volts times amps. So in the world of water if you took a high-pressure tank or pump, and blast it through a firehose 6 inches in diameter, then that is a visualization of high voltage, high amperage since the product of these what determines wattage, and that’s what gets work done, can see that the Niagara River may be running very slow, but it’s very deep and very wide, and can exert an unimaginable amount of energy. This would be the analog of Lower voltage but more amperage… Amperage is kind of like the AMOUNT of water that is moving.
"Hey mom, i learned something today."
I know it's kinda randomly asking but does anyone know of a good place to stream new tv shows online ?
@Johnathan Reuben Flixportal
@Major Rhys Thank you, signed up and it seems like they got a lot of movies there :D Appreciate it !!
@Johnathan Reuben Glad I could help :D
This changes everything I’ve ever learned 🤯
so is this correct to say? : the wall outlet has AC, which is converted into DC by the power cord, converted back into AC by the qi pad, and then converted yet again to DC by the phone?
If the qi pad is connected to power trough a usb cable then yes, but if its connected directly to the outlet it just steps down the ac voltage and transfer it wirelessly
He is very very good at explaining this in simpleton terms and yet I’m still kinda confused
This is brilliant. Why didn't phone battery engineers think to use this before
I only got a wireless charger today (because it is located on top of an alarm clock which I needed as my phone wasn't charging via USB and the alarm did't work). Anyway, I plugged in the alarm clock and my phone was still plugged into the USB cord and the charging symbol came on. The phone was on the night stand just next to the charging station. I thought maybe it was just my phone (it is in an otter box, so I don't know if that makes a difference) and I unplugged the USB cord. I put the phone on top of the charging station. The phone seemed to stop charging. I plugged the USB cord in and the phone seemed to start charging again. I haven't checked it as it hasn't been that long and it was only at 0%, but that seems weird - having the USB cord in and it charges on what is supposed to be a wireless charging station and yet it doesn't seem to charge without the USB plug at the wireless charging station. I don't know if the otterbox blocks the charge and somehow the USB cord works to help it with the charge. After all, the phone was charging with just the USB and maybe the charging port isn't clean enough for just the USB and the wireless charger helps because of the USB and the metal charging port?
so when you've used the cellular battery a few years and it doesn't hold the charge any more... why is this, its still going to the same place so how does it get there so much quicker?
So then after a while, after many charge cycles it gets more difficult for the electrons to become more useful again?
I've read that modern cellphone batteries are more efficient than they were just a few years ago. Now the experts say that batteries actually last longer if you top them up frequently throughout the day. I've been using a qi charger on my samsung galaxy s7 edge for 2 1/2 years and going strong.
That is so Great. I feel like I have the physics cheat sheet now. The smoke & mirrors age is over. The Truth of the Good Life is now closer for all of us. Thank you so much ThioJoe,
Srs this taught me more than I could have imagined
Thanks!
I'm fucking jealous of your brain, REALLY +TheoJoeTech
Also I really enjoy these physics videos, haha
Amazing.
WOW....He decided to tell the truth! Interesting ...Happy electrons...
Keep it up strong 💪
ThioJoe making videos about tech that are real... also Marty is at my front door
This was the bes video i ever watched on youtube.
such an eye opener
AC current and DC current? Alternating current current and Direct current current. Wanna try that again, Joe?
I have an idea for a quick charge device.. could you use lithium ion batteries to pull in the electrical current in order to charge a phone? It’s just a quick charge. Maybe get your phone to 25%? Without it being plugged in? Using the same theory but with batteries?
Batteries are a prison that produces power off of the sadness of electrons. That's dark.
MERCI
Now the question is... if you had the positive battery and the negative battery seperated and a physical switch to stop current when the phone is off, would you get the most efficient battery ever?
+DarkDoesGaming I don't really know about this sort of stuff, but I think the electricity is created when the electrons make contact.
+DarkDoesStuff The phone is never fully off, because the battery must stay connected & supplying some power to detect the "ON" switch, which the CPU uses to turn on other circuits. There are many other ways to optimize battery life, such as reversing colors on the display so that it is mostly dark instead of bright (less light, less electric power used).
how efficient is this compared to plugging it in?
I've read that wireless charging is slightly slower than wired charging.
its Chi (qi) btw i think?
It is
Well it’s not phonetically, or it would’ve been spelled “Chi “
Same word different variation in how they tried to put it in English letters I believe. I have also seen ki
Do electrons have feelings?
You have to get them out of their shell for them to flow.. so maybe
Last time I asked them they did, about an year ago. 🤣
That would be a negative
GOOD !!
if i didn't already know this i would've thought this was another one of his slick prank videos
Can you plug the wireless charger in the wall and charge another phone wile the wireless charger in charging
thats still some magic right there
holly hell it did made sense to me thanks for explain it both in dumb and nerd way possible, going to go and impress my friends now tomorrow :v
please stop saying "DC is more useful", this is not an absolute statement, you cant really say DC is better than AC. Batteries work with DC current, so for this particular case, its not only "more useful" but actually "necessary". Dont get me wrong, I like your video and how you explain it! Just that this statements can confuse people and create false precepts
Is there any energy savings using Qi instead of plugging into a charger?
No, it uses more energy.
I thought the electrons gets converted to photons and emitted as light by the LCD and heat as it run off charge..
What I wanted to know is how does Qi work and why is it incompatible with PMA. Surely inductance is inductance? All he explains here (in a round about way) is how a transformer works. We all know that part.
Visuals would have greatly helped, but I somewhat understood what he said.
can u make a video on how to make a QI it at home !m
wont it create a magnetic field in the coil present in the phone??
So that's why flat batteries don't lose weight... :P
Is there another way to rearrange the electrons? (Magnets maybe?) :)
well, I think he made it more complicated. an engineer never takes electrons that seriously because we cannot measure them easily, so for engineers the current and emf matters. however the emf and current is a result of electrons actions.
For a moment i thought it was a Linus video when i clicked on it.
What is better wiress charg or wire.
It depends on the charger, but typically wired charging will be faster.
So is this why there are alot of copper rings on an old samsung battery?
Dont be so hard on your self great explanation use more diagrams
So nanotechnology can move the electrons back with the same power of the battery making it last almost forever?
Can i charge my Android on iPhone qi charge?
Yes, you can. Android phones like the Samsung Galaxy S6 in 2015 were the first phones designed to be compatible with qi charging.