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Registered Member #2581
Joined: Tue Dec 29 2009, 09:08AM
Location:
Posts: 18
Hi everyone i am working on wireless power transfer project, till now i had been working on marko schematic till now its the great design that has inspired me to work on, in marko design with current low application designing i am facing some problem like mosfet, resistor, capacitor, and my pcb inductor get heat up fast and i can't run the design more then 8 to 10 min, i am attaching pdf file of my transmitter and receiver inductor design.
I am looking for the design based on TL494 with frequency ranging from 150Khz to 500Khz with full or half H bridge circuit which should be working on 24VDC and its power consumption for design should not exceed more then 1.5 amp. if any one can help me out for my this problem and provide proper working design schematic then that will be really help full to me.
Once the any member or any volunteer provide the working schematic then i will test it with my all receiver schematic for mobile (PDA, iphone, mp3 player, remote, digital camera, etc) charging, 5watt led lamp and much more i am working on the basic stream. I will post all schematic and video as my work progress. because i want to make this technology open to every one and inspiration for many creative mind to implement wireless concept in as many as application possible.
I will be waiting for help..........
My till now work demo link are below which was done using the marko design from Miniature wireless power demonstrator
Registered Member #2529
Joined: Thu Dec 10 2009, 02:43AM
Location:
Posts: 600
You need to increase the amount of metal used in your coil, and multiply up the other components as well so that they carry the power in parallel and don't exceed their individual temperature limits.
So the coils conductors need to be thicker, or use multiple coils. It might also help to put lots of fine tracks in parallel, rather than one thick track- you may be getting eddy currents as the field builds and collapses each cycle. You could look into that, it's something that might help a bit.
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
So do most of our Tesla coils, and has anyone had a plane land in their driveway yet?
All of these things are extraordinarily poor radiators. Wireless power transfer works in the near field ("reactive" field).
I used to think that the near field couldn't transfer real power because it's "reactive", and any transfer of real power must therefore be radiative, but that's not the case. Well, according to Ron Schmitt in his excellent book "Electromagnetics Explained" (EDN)
Registered Member #2463
Joined: Wed Nov 11 2009, 03:49AM
Location:
Posts: 1546
So do most of our Tesla coils, and has anyone had a plane land in their driveway yet?
The difference is this project was to transmit power to light a lamp not by induction but by a EM wavelength involving a resonant frequency that may fall on one of the beacon paths used in the area. Few TC's have this objective. It would be a simple matter to find out what beacons are in a given area. These beacons are very old technology. In our area, I drive by the transmitter when I go into town.
The transmission is AM and not high power. In coastal mountain areas flying is tricky for small planes and these systems are still used as a resource to locate the airport.
This incident, where seven electrical workers died, flying into our town was navigation related and is still under investigation.
Registered Member #2529
Joined: Thu Dec 10 2009, 02:43AM
Location:
Posts: 600
It's theoretically possible, but as Steve says, this is nearly all near field stuff.
You'd have to do the calculation yourself, but last time I tried to work this out, the power breakdown looked very, very roughly like:
70% power transmission absorbed by the receiver 25% heat dissipated in coils <5% radiated power
And it's going to depend on geometry. (Somebody should try to check it, I'm not an expert at aerial theory).
So you might get 50mW radiated power per watt of power you put in to the transmitter coil or something, and the more efficient the link is, the less power is transmitted (because the receiver generates a counter field).
Incidentally, in many ways a TC is a lot worse- it's basically a powerful spark-gap transmitter and is transmitting crap at quite high power across all bandwidths.
Registered Member #2581
Joined: Tue Dec 29 2009, 09:08AM
Location:
Posts: 18
radiotech wrote ...
So do most of our Tesla coils, and has anyone had a plane land in their driveway yet?
The difference is this project was to transmit power to light a lamp not by induction but by a EM wavelength involving a resonant frequency that may fall on one of the beacon paths used in the area. Few TC's have this objective. It would be a simple matter to find out what beacons are in a given area. These beacons are very old technology. In our area, I drive by the transmitter when I go into town.
The transmission is AM and not high power. In coastal mountain areas flying is tricky for small planes and these systems are still used as a resource to locate the airport.
This incident, where seven electrical workers died, flying into our town was navigation related and is still under investigation.
hai i really thanks for your concern about the topic for disturbance to the airport. but i would like to put light to your thinking that the many products have been developed using wireless power transfer and they have been certified with FCC standard's if you check out the following site , , for their product and development. They have developed their product under the same frequency range from 150Khz to 500Khz, their more than 50 patents which show the same frequency range for wireless power transfer, and many IEEE paper also.
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Wireless Power Transfer - mobile charging, 5 Watt lamp
