Quarter of a million views, thanks everyone!
The power cord, I know you hate it. Sometimes, you just want to cut it apart! Well say goodbye to your power cords, because with the power of inductive coupling your device will not need to be connected metal to metal. Seemlessly your device can be charged!
This instructable will show you the basics of creating your own cheap and easy wireless power mat, which you can use to power your device through the air!
New Update: complete list of components.
Check out my new project on sending a balloon into space!!
http://www.instructables.com/id/My-Space-Balloon-Project-Stratohab-Success-High/
The power cord, I know you hate it. Sometimes, you just want to cut it apart! Well say goodbye to your power cords, because with the power of inductive coupling your device will not need to be connected metal to metal. Seemlessly your device can be charged!
This instructable will show you the basics of creating your own cheap and easy wireless power mat, which you can use to power your device through the air!
New Update: complete list of components.
Check out my new project on sending a balloon into space!!
http://www.instructables.com/id/My-Space-Balloon-Project-Stratohab-Success-High/
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Signing UpStep 1: What is it? How does it work?
A few years ago MIT created a system for transferring power wirelessly. They transmitted power over a two-meter distance, from the coil on the left to the coil on the right, where it powers a 60W light bulb. Back in 2006, this was a pretty cool thing. You can only imagine what the implications of something like this would be. Well, unlike most of us, we do not have the time or material goods like MIT has. So i have made this simple and easy to follow Instructable, so all of you good people can experience the joy of wireless power.
Inductive Coupling uses magnetic fields to transfer power. There is a primary coil, which generates a magnetic field. Then there is another secondary coil which is composed of a capacitor and a coil, the capacitor creates a resonant circuit with the primary and secondary coils. Seem easy? Well, before publishing this instructable I found many useful and a lot of non-useful info on the subject.
In my research I found, that to transfer power in very complicated. Once i did it I found that you do not need to go to MIT do do this sort of stuff. With a little electrical know how, this is easy.
It all starts with the transmitter. This transmitter needs to create 147.7 kHz square wave AC signal. Let me take a minute to explain this all. Level one on the frequency scale is Hertzs, then there is kHz, then MHz. MIT used a 10 mHz wave to drive there coils, but for this we will be using a 147.7 kHz signal so it does not get too complicated.
The secondary coil has a 0.02 uF capacitor. This will allow the two circuits to be coupled therefore, transferring power efficiently. The 0.02 uF capacitor is used only for this frequency, and the value of this capcitor will change depending on the frequency.
The primary coil creates a magnetic field, when another coil is placed near it, energy will be induced into it.
Be in mind that i could not get a hold of a 0.02uF capacitor so i used two 0.01uF capacitors connected together.
Inductive Coupling uses magnetic fields to transfer power. There is a primary coil, which generates a magnetic field. Then there is another secondary coil which is composed of a capacitor and a coil, the capacitor creates a resonant circuit with the primary and secondary coils. Seem easy? Well, before publishing this instructable I found many useful and a lot of non-useful info on the subject.
In my research I found, that to transfer power in very complicated. Once i did it I found that you do not need to go to MIT do do this sort of stuff. With a little electrical know how, this is easy.
It all starts with the transmitter. This transmitter needs to create 147.7 kHz square wave AC signal. Let me take a minute to explain this all. Level one on the frequency scale is Hertzs, then there is kHz, then MHz. MIT used a 10 mHz wave to drive there coils, but for this we will be using a 147.7 kHz signal so it does not get too complicated.
The secondary coil has a 0.02 uF capacitor. This will allow the two circuits to be coupled therefore, transferring power efficiently. The 0.02 uF capacitor is used only for this frequency, and the value of this capcitor will change depending on the frequency.
The primary coil creates a magnetic field, when another coil is placed near it, energy will be induced into it.
Be in mind that i could not get a hold of a 0.02uF capacitor so i used two 0.01uF capacitors connected together.
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also, is it possible to use metals other than copper?
thank you for sharing
I can't find any simple schematics or info on how to accomplish that though looking at info I did find I should be able to use just 2 coils and perhaps just a couple condensers and resistors... I'd appreciate if anyone could be so kind to point me in the right direction! Thanks in advance! :D
i'am want to know...
how the secondary receive volt from primary...
can u explain to me....
thanks you..
There is a common mis-conception that the power is transfered by induction.
This is not true. The power transfers by coupled magnetic resonance --the magnetic equivalent of Tesla's high-voltage resonance.
Check my time-line I'm still working on...
http://portal.groupkos.com/index.php?title=Near_Field_Resonance_Time-line
The coupling phenomena is more akin to nuclear magnetic resonance than common induction.
One company is already making a power-pad wireless power charger for electric vehicles.
Google the quoted term "wireless power transfer" for starts. There's lots of background, more almost every day.
Another company already announced a cell-phone wireless power antenna. See my wiki above... main page, top of the top-fifty list... Electromagnetic Coils.
Have fun... run the background... there's are hardly any experts out here yet!
DonEMitchell
Firstly, when electricity runs though anything (not just wires) it creates a very very very small electromagnetic field.
Secondly, this electromagnetic field has a spin around the conductor relative to the direction of flow of electricity.*
Thirdly, this spin is amplified by proximity to other conductors.
Fourthly, flow creates spin and spin creates flow.
Now that you know those four things I can begin to explain.
The primary coil is a coil and not just a solitary wire because the voltage being put through it does not create enough of an electromagnetic field to transmit power. So when the wire is looped around next to itself it acts like one big wire and creates a larger field than that of a single wire.
Once the field has been increased from a few micrometers to a few inches in this manner you can start to receive power. Due to the spin created by the field any circuit (electricity has to have a place to flow) placed within it will "resonate" this spin and begin to carry electricity on its own almost as if by magic.**
But this only goes so far. This field, while stronger than before and able to generate electricity, does not have quite enough power to be able to run a device receiving power through a single wire. And so it must be passively amplified (through another coil) before it can be sent to the components you are trying to use.
Once amplified in this manner there is enough voltage flowing through the receiving coil to power the device or components it is attached to.
PS This is a relatively basic and general explanation of how this works. A more detailed description of it can be found almost anywhere.
Wireless Energy Transfer
Electromagnetic Induction
Make Presents: The Inductor (Watch the whole series of Make Presents videos they explain almost all of the basic electronics components)
*Use the Right Hand Grip rule to determine direction of spin. Hold your right hand up in a fist with your thumb up. Your thumb represents the flow of electricity down the wire. Your fingers represent the direction of spin around the wire.
** This is the principle behind an Electro-Magnetic Pulse (EMP) the pulse creates so much voltage within the target's circuitry that it overloads all of the components, and destroys any form of magnetic storage.
I tried the links you've provided for the Function Generator but the links say that they are not manufacturing the products.
Is there a way to get the project done without the generator?
And how to make the secondary coil?
PS. (pleeeaase do answer. i'm doing this for my school science fair)
(dealXtreme) this mouse, more precisly 'http://www.dealextreme.com/p/wireless-optical-mouse-9?item=2' no quotes
I want to make it fully wireless
with no need of batteries, this mouse can't hold up so much, 2 fresh AAA baterias, 2, maybe 5 days top, and the baterryes are dead...
can i do that?
won't harm my PC? i would put the large coil 'maybe under the table, wooden table, or make a case for it, tiny , so i put the mouse on it, 24\7 on wireless'
can i do that?
mouse uses 2 AAA bateries, 3V...
http://www.instructables.com/id/Wireless-Ipod-Charger/?ALLSTEPS#
and i am having small doubts ............... ............
desperately needing experts advice's
help me
I used a PCB patterned coil for the transmitter/receiver.
https://sites.google.com/site/ddmcintosh2projects/inductive-charger