Instructables

Wireless Power Transfer (Simple and Fast Way)

I've been searching about this topic for a year to make a simple project. However i found nothing simple. Every project contains hard to find materials and high voltage. I'm trying to make it simpler. I also find a Hungarian site about this project. But i made some changes. Schematic in this site will also help you. http://skory.gylcomp.hu/kapcs/

Step 1: Materials...

Picture of Materials...
Materials required;
(I give capacitors by using codes and values)

-  BD139 Transistor                                    /  1
-  5.1 K resistor (all resistors will work)   /  1
-  220n or 224 Capacitor                           /  1
-  4.7n or 472 Capacitor                            /  2
-  1.5pF or 102 Capacitor                          /  1
-  LED                                                            /  1
-  1N4148 Zener Diode                              /  1
-  Jumper wires
-  Cable for Coil 
-  9V Battery and Clip

Step 2: Making Coils

I made coils which have 7.5 and 4.4 cm diameter. Both work very well.How I don't know about numbers of winding. I use 1.5m cable.
Whatever... We need to make 2 coils, one for receiver and another for transmitter circuit. Receiver circuit need normal coil, no splice.
However the coil which is going to attached to the transmitter circuit is different. It needs a wire which is come out at the middle of the coil. This is the most important part otherwise the circuit may not work. 

Step 3: Making the Transmitter Circuit

Picture of Making the Transmitter Circuit
Ekran Resmi 2013-02-03 13.40.52.png
Ekran Resmi 2013-02-03 13.40.56.png
It's time to make transmitter circuit. I build this into breadboard but you can easily transfer into the perfboard. It's definitely much more steady.

Step 4: Making the Receiver Circuit

It is much more simpler than the transmitter circuit, so i directly soldered it onto the receiver coil which have 2 outputs.

Step 5: Result

Now when you add 9V to the rails and put the receiver circuit to the top of the transmitter circuit it should light up. If it's not, check your connections and polarity of diode.

Step 7: Schematic

Picture of Schematic
There is it ;

Note:I made it simpler this project not belongs to me. Just for entertainment and educational purposes only.
 
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HezrinHaze20 days ago
Done. :)
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A14 (author)  HezrinHaze11 days ago
Well done you done better than me :)
HezrinHaze A149 days ago

thanks man. i think i made this project the same time as you. got it from the same source you did. lol

This system is working upto how much distance?

the furthest mine went with 9v was 5cm with 50nF capacitor. :)

A14 (author)  SELVAKUMARM11 days ago
max 10-15 cm
markk215 months ago

what is diameter of the both wires?

A14 (author)  markk2111 days ago
you can change it but they must be same
anayaka1 month ago

I have done it but its not working

A14 (author)  anayaka11 days ago
be sure to double check your connections(exactly transistor) if you done everything correctly it should work well
tejaswiv28 days ago

which type of cable do we need to use for coil

A14 (author)  tejaswiv11 days ago
just regular stranded cable
HezrinHaze20 days ago
The diodes on the recieving circuit is not necessary and the capacitor increases the recieving range. :)
temp_-576653116.jpg
kirangowda3 months ago

can i use any type of capacitors??

sr98 months ago

i have done the above project and the LED glows. how can i modify the above circuit so that i can glow a 60W bulb (or even a 15W CFL bulb) half meters away ?? how can i modify the above circuit??

dkols sr96 months ago

hi,
I have done the connection as per the circuit diagram.But LED didnt glow.Can u please help me to make the LED glow?....my id is dharshap@gmail.com.....I want to do it as soon as possible....

this circuit is just enable to on the led..it is not give requried voltage to charge battery...

what is the input resistance of the circuit????

how much watt is requried to operate this circuit??

what should i do to increase the output voltage and current of the circuit???

rply me fast.

shrawan987 months ago
am trying out this project for my science project. I I I made the primary and secondary as explained by you but it just don`t work. I did not use diode in my secondary circuit, is it a must.
Can you please help me
A14 (author)  shrawan987 months ago
yes you must need to use diode to make electrons flow in one way
shrawan987 months ago
I made the connection ...but LED didn't glow...can u help me?
A14 (author) 1 year ago
I'll help you if you have some questions
dkols A147 months ago

I made the connection ...but LED didn't glow...can u help me?

svidal2 A148 months ago
Hey guys can you help me? I´m on a hurry I don´t know how to make the three output coil for the transmiter. Could you help me by explaining how? My mail is jsvidal99@gmail.com
A14 (author)  svidal28 months ago

Just measure your wire and mark the center of it, strip the insulation and solder another piece of wire then start winding your coil.

svidal2 A148 months ago
Hey guys can you help me? I´m on a hurry and I don´t know how to make the three output coil. Could you help me by explaining how? My mail is jsvidal99@gmail.com
Mel007 A149 months ago
i am trying out this project for my science project. I made the primary and secondary as explained by you but it just don`t work. I did not use diode in my secondary circuit, is it a must.
Can you please help me.
A14 (author)  Mel0079 months ago
Yes you must need to use diode

plz send me all data about this project also send me function of diode and bd139 transistor and 2 coils at primary side .plzzzzzzzzzzzzz my email id is (Tahir_5050@yahoo.com) on g mail (enggtahir666@gmail )com plzzzzzzzzzzzzzz send

me0048 months ago

instant of 470p cap what can i use

dkols8 months ago

how to make coil with 3 output?

I plan on making this over the weekend with my sons. I think this is a great little project, but I do have a question in regards to it. Can you skip the transistor and just supply the 3-part coil with direct AC? If I use my small 9V AC power supply, which would make this much faster & simpler to build because I won't be converting DC to AC, replace the transistor? Or is the transistor essential because it amplifies the current to the coil? I'll probably figure it out on my own, but I thought a quick question or two wouldn't hurt. I also plan on hooking it up to my oscilloscope to see what wave forms I can get and just see what's going on.

Also, and this just came to me, if I use a circular copper pipe and cut, say, 2 to 2.5 cm wide rings, could this substitute the need for coils? My thinking is that if I cut a copper ring about 2 cm or so and drill a hole or two for the diode/cap/LED and solder them to the copper ring, it might work. I'm not sure. But this project sure looks fun & I can't wait to try it out. Thanks for the Instructable! =]
A14 (author)  49percentGood1 year ago
It's great to have a nice comment from you. First of all I used transistor to convert DC to AC so, you can use your 9V AC power source. However I don't know if you can use copper pipes maybe your power source weak for that because pipes have too much resistance, and you can also try your system with 2 part coil.

P.S.= I might be wrong about electronics, so be careful and always make your own decisions.

Good Luck and thanks for your reply.
I did some digging and came up with a bunch of equations for Inductance, Coupling Coefficient, etc. and the copper pipe/ring wouldn't work. I figured as much but I thought it was worth a shot. After All, thinking outside the box is what got us electricity in the first place. =]
i am trying out this project for my science project. I made the primary and secondary as explained by you but it just don`t work. I did not use diode in my secondary circuit, is it a must.
Can you please help me.
A14 (author)  Mel0078 months ago

Yes you must need diode to light up the led and always check the polarity of the diode.

me0048 months ago

how long the bulb glow

A14 (author)  me0048 months ago
It depends on capacitance value of your capacitor, mine is 10000µF so it glows about a minute.
nmetana8 months ago

i made another simpler but input was 220v and output about 5v! it was my first wirtricity experiment,

i have 2 quistions about ur work:

1. what about efficiency of this expriment? how is that? not voltage or current, i mean power.
2. u know how to do this expriments for high voltages? for example input 220, and output 60 or 110 vots.

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